mirror of https://github.com/elisescu/tty-share
Add support for local network terminal sharing
Moved the server inside the tty-share binary, and serve it locallypull/25/head
Vasile Popescu
4 years ago
committed by
Elis Popescu
parent
ba44046699
commit
584cba56c9
@ -1,24 +1,28 @@
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High level architecture
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=======================
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# High level flow
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## Direct terminal sharing
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```
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Alice
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No proxy needed. `tty-share` will start a command, and be ready to serve it's output and input over WS connections.
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+-tty-share---------------+ +-tty-server----------------+ Bob
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| | | | https:// +------------+
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| +------+ +-----+ | TLS | +------+ +---------+ | wss:// |tty-receiver|
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| | bash | <-+-> |proto| <---------------> | proto| <-> | session | +-----+------> | 1 |
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| +------+ | +-----+ | | +------+ +---------+ | | +------------+
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| | | | | |
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| +-> pty | +---------------------------+ | +------------+
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+-------------------------+ +------> |tty-receiver|
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| 2 |
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+------------+
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```
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## Proxy terminal sharing
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Alice wants to share a terminal session with Bob, so she starts `tty-share` on her machine, inside the terminal. `tty-share` then connects to the `tty-server` and starts inside a `bash` process. It then puts the terminal in which it was started in RAW mode, and the stdin and stdout are multiplexed to/from the `bash` process it started, and the remote connection to the `tty-server`. On the server side, a session is created, which connects the `tty-share` connection with the future `tty-receiver` instances, running in the browser. The `tty-receiver` runs inside the browser, on top of [xterm.js](https://xtermjs.org/), and is served by the server, via a unique session URL. Alice has to send this unique URL to Bob.
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- the `tty-share` opens a TCP connection to the `tty-proxy`
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- the `tty-proxy` proxy accepts the connection, generates a session ID, and sends it back to `tty-share`
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- there is now a direct connection between the two
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- a session ID to map any web connections to the `tty-share` side
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Once the connection is established, Bob can then interact inside the browser with the `bash` session started by Alice. When Bob presses, for example, the key `a`, this is detected by `xterm.js` and sent via a websockets connection to the server side. From there, it is sent to the `tty-share` which sends it to the pseudo terminal attached to the `bash` process started inside `tty-share`. Then character `a` is received via the standard output of the `bash` command, and is sent from there both to the standard output of the `tty-share`, so Alice can see it, and also to the `tty-receiver` (via the server), so Bob can see it too.
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- `tty-share` gets http requests:
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- `/` (direct, from a listening server): serves the `index.html` - templated for direct requests (e..g: `<script src="/static/tty-receiver.js"></script>`)
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- `/` (via the `tty-proxy` TCP connection): serves the `index.html` - templated for the respective session (it already has the session). (e.g.: `<script src="<id>/static/tty-receiver.js"></script>`)
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- `/ws/` (direct, from the listening server): accepts a WS connection and connects it to the command opened
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- `/ws/` (via the `tty-proxy` TCP connection): accepts a WS connection and connects it to the command opened
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More specific details on how this is implemented, can be seen in the source code of the `tty-share`.
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- `tty-proxy` gets HTTP requests:
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- `/s/<id>/*` - builds a HTTP request forwards it to the TCP connection it has to the `tty-share` for that `<id>`
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- `/ws/<id>` - forwards the WS connection to the `tty-share`, over the *same* TCP connection as above
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- over the same TCP connection, we have to pass multiple requests + a WS connection
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- https://godoc.org/github.com/hashicorp/yamux
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- https://godoc.org/github.com/soheilhy/cmux#pkg-examples
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x
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@ -1,150 +0,0 @@
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package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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)
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type ProtocolMessageIDType string
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const (
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MsgIDSenderInitRequest = "SenderInitRequest"
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MsgIDSenderInitReply = "SenderInitReply"
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MsgIDSenderNewReceiverConnected = "SenderNewReceiverConnected"
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MsgIDReceiverInitRequest = "ReceiverInitRequest"
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MsgIDReceiverInitReply = "ReceiverInitReply"
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MsgIDWrite = "Write"
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MsgIDWinSize = "WinSize"
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)
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// Message used to encapsulate the rest of the bessages bellow
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type MsgAll struct {
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Type ProtocolMessageIDType
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Data []byte
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}
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// These messages are used between the server and the sender/receiver
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type MsgTTYSenderInitRequest struct {
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Salt string
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PasswordVerifierA string
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}
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type MsgTTYSenderInitReply struct {
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ReceiverURLWebReadWrite string
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}
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type MsgTTYSenderNewReceiverConnected struct {
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Name string
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}
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type MsgTTYReceiverInitRequest struct {
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ChallengeReply string
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}
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type MsgTTYReceiverInitReply struct {
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}
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// These messages are not intended for the server, so they are just forwarded by it to the remote
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// side.
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type MsgTTYWrite struct {
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Data []byte
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Size int
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}
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type MsgTTYWinSize struct {
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Cols int
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Rows int
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}
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func ReadAndUnmarshalMsg(reader io.Reader, aMessage interface{}) (err error) {
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var wrapperMsg MsgAll
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// Wait here for the right message to come
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dec := json.NewDecoder(reader)
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err = dec.Decode(&wrapperMsg)
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if err != nil {
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return errors.New("Cannot decode message: " + err.Error())
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}
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err = json.Unmarshal(wrapperMsg.Data, aMessage)
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if err != nil {
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return errors.New("Cannot decode message: " + err.Error())
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}
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return
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}
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func MarshalMsg(aMessage interface{}) (_ []byte, err error) {
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var msg MsgAll
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if initRequestMsg, ok := aMessage.(MsgTTYSenderInitRequest); ok {
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msg.Type = MsgIDSenderInitRequest
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msg.Data, err = json.Marshal(initRequestMsg)
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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if initReplyMsg, ok := aMessage.(MsgTTYSenderInitReply); ok {
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msg.Type = MsgIDSenderInitReply
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msg.Data, err = json.Marshal(initReplyMsg)
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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if writeMsg, ok := aMessage.(MsgTTYWrite); ok {
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msg.Type = MsgIDWrite
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msg.Data, err = json.Marshal(writeMsg)
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//fmt.Printf("Sent write message %s\n", string(writeMsg.Data))
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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if winChangedMsg, ok := aMessage.(MsgTTYWinSize); ok {
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msg.Type = MsgIDWinSize
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msg.Data, err = json.Marshal(winChangedMsg)
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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if newRcvMsg, ok := aMessage.(MsgTTYSenderNewReceiverConnected); ok {
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msg.Type = MsgIDSenderNewReceiverConnected
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msg.Data, err = json.Marshal(newRcvMsg)
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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return nil, nil
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}
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func MarshalAndWriteMsg(writer io.Writer, aMessage interface{}) (err error) {
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b, err := MarshalMsg(aMessage)
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if err != nil {
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return
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}
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n, err := writer.Write(b)
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if n != len(b) {
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err = fmt.Errorf("Unable to write : wrote %d out of %d bytes", n, len(b))
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return
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}
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if err != nil {
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return
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}
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return
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}
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@ -0,0 +1,25 @@
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package main
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import (
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"io"
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)
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type combiner struct {
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r io.Reader
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w io.Writer
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}
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func newReadWriter(r io.Reader, w io.Writer) io.ReadWriter {
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return &combiner{
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r: r,
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w: w,
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}
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}
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func (c *combiner)Read(p []byte) (n int, err error) {
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return c.r.Read(p)
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}
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func (c *combiner)Write(p []byte) (n int, err error) {
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return c.w.Write(p)
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}
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File diff suppressed because one or more lines are too long
@ -1,150 +0,0 @@
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package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
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)
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type ProtocolMessageIDType string
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const (
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MsgIDSenderInitRequest = "SenderInitRequest"
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MsgIDSenderInitReply = "SenderInitReply"
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MsgIDSenderNewReceiverConnected = "SenderNewReceiverConnected"
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MsgIDReceiverInitRequest = "ReceiverInitRequest"
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MsgIDReceiverInitReply = "ReceiverInitReply"
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MsgIDWrite = "Write"
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MsgIDWinSize = "WinSize"
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)
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// Message used to encapsulate the rest of the bessages bellow
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type MsgAll struct {
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Type ProtocolMessageIDType
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Data []byte
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}
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// These messages are used between the server and the sender/receiver
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type MsgTTYSenderInitRequest struct {
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Salt string
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PasswordVerifierA string
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}
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type MsgTTYSenderInitReply struct {
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ReceiverURLWebReadWrite string
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}
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type MsgTTYSenderNewReceiverConnected struct {
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Name string
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}
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type MsgTTYReceiverInitRequest struct {
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ChallengeReply string
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}
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type MsgTTYReceiverInitReply struct {
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}
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// These messages are not intended for the server, so they are just forwarded by it to the remote
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// side.
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type MsgTTYWrite struct {
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Data []byte
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Size int
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}
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type MsgTTYWinSize struct {
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Cols int
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Rows int
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}
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func ReadAndUnmarshalMsg(reader io.Reader, aMessage interface{}) (err error) {
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var wrapperMsg MsgAll
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// Wait here for the right message to come
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dec := json.NewDecoder(reader)
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err = dec.Decode(&wrapperMsg)
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if err != nil {
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return errors.New("Cannot decode message: " + err.Error())
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}
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err = json.Unmarshal(wrapperMsg.Data, aMessage)
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if err != nil {
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return errors.New("Cannot decode message: " + err.Error())
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}
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return
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}
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func MarshalMsg(aMessage interface{}) (_ []byte, err error) {
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var msg MsgAll
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if initRequestMsg, ok := aMessage.(MsgTTYSenderInitRequest); ok {
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msg.Type = MsgIDSenderInitRequest
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msg.Data, err = json.Marshal(initRequestMsg)
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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if initReplyMsg, ok := aMessage.(MsgTTYSenderInitReply); ok {
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msg.Type = MsgIDSenderInitReply
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msg.Data, err = json.Marshal(initReplyMsg)
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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if writeMsg, ok := aMessage.(MsgTTYWrite); ok {
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msg.Type = MsgIDWrite
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msg.Data, err = json.Marshal(writeMsg)
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//fmt.Printf("Sent write message %s\n", string(writeMsg.Data))
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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if winChangedMsg, ok := aMessage.(MsgTTYWinSize); ok {
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msg.Type = MsgIDWinSize
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msg.Data, err = json.Marshal(winChangedMsg)
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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if newRcvMsg, ok := aMessage.(MsgTTYSenderNewReceiverConnected); ok {
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msg.Type = MsgIDSenderNewReceiverConnected
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msg.Data, err = json.Marshal(newRcvMsg)
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if err != nil {
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return
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}
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return json.Marshal(msg)
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}
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return nil, nil
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}
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func MarshalAndWriteMsg(writer io.Writer, aMessage interface{}) (err error) {
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b, err := MarshalMsg(aMessage)
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if err != nil {
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return
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}
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n, err := writer.Write(b)
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if n != len(b) {
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err = fmt.Errorf("Unable to write : wrote %d out of %d bytes", n, len(b))
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return
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}
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if err != nil {
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return
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}
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return
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}
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@ -1,47 +0,0 @@
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package main
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import (
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"flag"
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"os"
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"os/signal"
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logrus "github.com/sirupsen/logrus"
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)
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// MainLogger is the logger that will be used across the whole main package. I whish I knew of a better way
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var MainLogger = logrus.New()
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func main() {
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webAddress := flag.String("web_address", ":80", "The bind address for the web interface. This is the listening address for the web server that hosts the \"browser terminal\". You might want to change this if you don't want to use the port 80, or only bind the localhost.")
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senderAddress := flag.String("sender_address", ":6543", "The bind address for the tty-share TLS connections. tty-share tool will connect to this address.")
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url := flag.String("url", "http://localhost", "The public web URL the server will be accessible at. This will be sent back to the tty-share tool to display it to the user.")
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frontendPath := flag.String("frontend_path", "", "The path to the frontend resources. By default, these resources are included in the server binary, so you only need this path if you don't want to use the bundled ones.")
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flag.Parse()
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log := MainLogger
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log.SetLevel(logrus.DebugLevel)
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config := TTYServerConfig{
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WebAddress: *webAddress,
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TTYSenderAddress: *senderAddress,
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ServerURL: *url,
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FrontendPath: *frontendPath,
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}
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server := NewTTYServer(config)
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// Install a signal and wait until we get Ctrl-C
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt)
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go func() {
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s := <-c
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log.Debug("Received signal <", s, ">. Stopping the server")
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server.Stop()
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}()
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log.Info("Listening on address: http://", config.WebAddress, ", and TCP://", config.TTYSenderAddress)
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err := server.Listen()
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log.Debug("Exiting. Error: ", err)
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}
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@ -1,118 +0,0 @@
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package main
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import (
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"encoding/json"
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"io"
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)
|
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|
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type ServerSessionInfo struct {
|
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URLWebReadWrite string
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}
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|
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type ReceiverSessionInfo struct {
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}
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|
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type SenderSessionInfo struct {
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Salt string
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PasswordVerifierA string
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}
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// TTYProtocolConn is the interface used to communicate with the sending (master) side of the TTY session
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type TTYProtocolConn struct {
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netConnection io.ReadWriteCloser
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jsonDecoder *json.Decoder
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}
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func NewTTYProtocolConn(conn io.ReadWriteCloser) *TTYProtocolConn {
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return &TTYProtocolConn{
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netConnection: conn,
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jsonDecoder: json.NewDecoder(conn),
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}
|
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}
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func (protoConn *TTYProtocolConn) ReadMessage() (msg MsgAll, err error) {
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// TODO: perhaps read here the error, and transform it to something that's understandable
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// from the outside in the context of this object
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err = protoConn.jsonDecoder.Decode(&msg)
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return
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}
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func (protoConn *TTYProtocolConn) SetWinSize(cols, rows int) error {
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msgWinChanged := MsgTTYWinSize{
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Cols: cols,
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Rows: rows,
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}
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return MarshalAndWriteMsg(protoConn.netConnection, msgWinChanged)
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}
|
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|
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func (protoConn *TTYProtocolConn) Close() error {
|
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return protoConn.netConnection.Close()
|
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}
|
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|
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// Function to send data from one the sender to the server and the other way around.
|
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func (protoConn *TTYProtocolConn) Write(buff []byte) (int, error) {
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msgWrite := MsgTTYWrite{
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Data: buff,
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Size: len(buff),
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}
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return len(buff), MarshalAndWriteMsg(protoConn.netConnection, msgWrite)
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}
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|
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func (protoConn *TTYProtocolConn) WriteRawData(buff []byte) (int, error) {
|
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return protoConn.netConnection.Write(buff)
|
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}
|
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|
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// Function to be called on the sender side, and which blocks until the protocol has been
|
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// initialised
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func (protoConn *TTYProtocolConn) InitSender(senderInfo SenderSessionInfo) (serverInfo ServerSessionInfo, err error) {
|
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var replyMsg MsgTTYSenderInitReply
|
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|
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msgInitReq := MsgTTYSenderInitRequest{
|
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Salt: senderInfo.Salt,
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PasswordVerifierA: senderInfo.PasswordVerifierA,
|
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}
|
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|
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// Send the InitRequest message
|
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if err = MarshalAndWriteMsg(protoConn.netConnection, msgInitReq); err != nil {
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return
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}
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|
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// Wait here for the InitReply message
|
||||
if err = ReadAndUnmarshalMsg(protoConn.netConnection, &replyMsg); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
serverInfo = ServerSessionInfo{
|
||||
URLWebReadWrite: replyMsg.ReceiverURLWebReadWrite,
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) InitServer(serverInfo ServerSessionInfo) (senderInfo SenderSessionInfo, err error) {
|
||||
var requestMsg MsgTTYSenderInitRequest
|
||||
|
||||
// Wait here and expect a InitRequest message
|
||||
if err = ReadAndUnmarshalMsg(protoConn.netConnection, &requestMsg); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
// Send back a InitReply message
|
||||
if err = MarshalAndWriteMsg(protoConn.netConnection, MsgTTYSenderInitReply{
|
||||
ReceiverURLWebReadWrite: serverInfo.URLWebReadWrite}); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
senderInfo = SenderSessionInfo{
|
||||
Salt: requestMsg.Salt,
|
||||
PasswordVerifierA: requestMsg.PasswordVerifierA,
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) InitServerReceiverConn(serverInfo ServerSessionInfo) (receiverInfo ReceiverSessionInfo, err error) {
|
||||
return
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) InitReceiverServerConn(receiverInfo ReceiverSessionInfo) (serverInfo ServerSessionInfo, err error) {
|
||||
return
|
||||
}
|
||||
@ -0,0 +1,143 @@
|
||||
package server
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
)
|
||||
|
||||
type TTYProtocolReader struct {
|
||||
reader io.Reader
|
||||
jsonDecoder *json.Decoder
|
||||
}
|
||||
|
||||
type TTYProtocolWriter struct {
|
||||
writer io.Writer
|
||||
}
|
||||
|
||||
const (
|
||||
MsgIDWrite = "Write"
|
||||
MsgIDWinSize = "WinSize"
|
||||
)
|
||||
|
||||
// Message used to encapsulate the rest of the bessages bellow
|
||||
type MsgAll struct {
|
||||
Type string
|
||||
Data []byte
|
||||
}
|
||||
|
||||
type MsgTTYWrite struct {
|
||||
Data []byte
|
||||
Size int
|
||||
}
|
||||
|
||||
type MsgTTYWinSize struct {
|
||||
Cols int
|
||||
Rows int
|
||||
}
|
||||
|
||||
func ReadAndUnmarshalMsg(reader io.Reader, aMessage interface{}) (err error) {
|
||||
var wrapperMsg MsgAll
|
||||
// Wait here for the right message to come
|
||||
dec := json.NewDecoder(reader)
|
||||
err = dec.Decode(&wrapperMsg)
|
||||
|
||||
if err != nil {
|
||||
return errors.New("Cannot decode top message: " + err.Error())
|
||||
}
|
||||
|
||||
err = json.Unmarshal(wrapperMsg.Data, aMessage)
|
||||
|
||||
if err != nil {
|
||||
return errors.New("Cannot decode message: " + err.Error() + string(wrapperMsg.Data))
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func MarshalMsg(aMessage interface{}) (_ []byte, err error) {
|
||||
var msg MsgAll
|
||||
|
||||
if writeMsg, ok := aMessage.(MsgTTYWrite); ok {
|
||||
msg.Type = MsgIDWrite
|
||||
msg.Data, err = json.Marshal(writeMsg)
|
||||
//fmt.Printf("Sent write message %s\n", string(writeMsg.Data))
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
return json.Marshal(msg)
|
||||
}
|
||||
|
||||
if winChangedMsg, ok := aMessage.(MsgTTYWinSize); ok {
|
||||
msg.Type = MsgIDWinSize
|
||||
msg.Data, err = json.Marshal(winChangedMsg)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
return json.Marshal(msg)
|
||||
}
|
||||
|
||||
return nil, nil
|
||||
}
|
||||
|
||||
func MarshalAndWriteMsg(writer io.Writer, aMessage interface{}) (err error) {
|
||||
b, err := MarshalMsg(aMessage)
|
||||
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
n, err := writer.Write(b)
|
||||
|
||||
if n != len(b) {
|
||||
err = fmt.Errorf("Unable to write : wrote %d out of %d bytes", n, len(b))
|
||||
return
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
return
|
||||
}
|
||||
|
||||
func NewTTYProtocolWriter(w io.Writer) *TTYProtocolWriter {
|
||||
return &TTYProtocolWriter{
|
||||
writer: w,
|
||||
}
|
||||
}
|
||||
|
||||
func NewTTYProtocolReader(r io.Reader) *TTYProtocolReader {
|
||||
return &TTYProtocolReader{
|
||||
reader: r,
|
||||
jsonDecoder: json.NewDecoder(r),
|
||||
}
|
||||
}
|
||||
|
||||
func (reader *TTYProtocolReader) ReadMessage() (msg MsgAll, err error) {
|
||||
// TODO: perhaps read here the error, and transform it to something that's understandable
|
||||
// from the outside in the context of this object
|
||||
err = reader.jsonDecoder.Decode(&msg)
|
||||
return
|
||||
}
|
||||
|
||||
func (writer *TTYProtocolWriter) SetWinSize(cols, rows int) error {
|
||||
msgWinChanged := MsgTTYWinSize{
|
||||
Cols: cols,
|
||||
Rows: rows,
|
||||
}
|
||||
return MarshalAndWriteMsg(writer.writer, msgWinChanged)
|
||||
}
|
||||
|
||||
// Function to send data from one the sender to the server and the other way around.
|
||||
func (writer *TTYProtocolWriter) Write(buff []byte) (int, error) {
|
||||
msgWrite := MsgTTYWrite{
|
||||
Data: buff,
|
||||
Size: len(buff),
|
||||
}
|
||||
return len(buff), MarshalAndWriteMsg(writer.writer, msgWrite)
|
||||
}
|
||||
|
||||
func (writer *TTYProtocolWriter) WriteRawData(buff []byte) (int, error) {
|
||||
return writer.writer.Write(buff)
|
||||
}
|
||||
@ -1,118 +0,0 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"io"
|
||||
)
|
||||
|
||||
type ServerSessionInfo struct {
|
||||
URLWebReadWrite string
|
||||
}
|
||||
|
||||
type ReceiverSessionInfo struct {
|
||||
}
|
||||
|
||||
type SenderSessionInfo struct {
|
||||
Salt string
|
||||
PasswordVerifierA string
|
||||
}
|
||||
|
||||
// TTYProtocolConn is the interface used to communicate with the sending (master) side of the TTY session
|
||||
type TTYProtocolConn struct {
|
||||
netConnection io.ReadWriteCloser
|
||||
jsonDecoder *json.Decoder
|
||||
}
|
||||
|
||||
func NewTTYProtocolConn(conn io.ReadWriteCloser) *TTYProtocolConn {
|
||||
return &TTYProtocolConn{
|
||||
netConnection: conn,
|
||||
jsonDecoder: json.NewDecoder(conn),
|
||||
}
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) ReadMessage() (msg MsgAll, err error) {
|
||||
// TODO: perhaps read here the error, and transform it to something that's understandable
|
||||
// from the outside in the context of this object
|
||||
err = protoConn.jsonDecoder.Decode(&msg)
|
||||
return
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) SetWinSize(cols, rows int) error {
|
||||
msgWinChanged := MsgTTYWinSize{
|
||||
Cols: cols,
|
||||
Rows: rows,
|
||||
}
|
||||
return MarshalAndWriteMsg(protoConn.netConnection, msgWinChanged)
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) Close() error {
|
||||
return protoConn.netConnection.Close()
|
||||
}
|
||||
|
||||
// Function to send data from one the sender to the server and the other way around.
|
||||
func (protoConn *TTYProtocolConn) Write(buff []byte) (int, error) {
|
||||
msgWrite := MsgTTYWrite{
|
||||
Data: buff,
|
||||
Size: len(buff),
|
||||
}
|
||||
return len(buff), MarshalAndWriteMsg(protoConn.netConnection, msgWrite)
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) WriteRawData(buff []byte) (int, error) {
|
||||
return protoConn.netConnection.Write(buff)
|
||||
}
|
||||
|
||||
// Function to be called on the sender side, and which blocks until the protocol has been
|
||||
// initialised
|
||||
func (protoConn *TTYProtocolConn) InitSender(senderInfo SenderSessionInfo) (serverInfo ServerSessionInfo, err error) {
|
||||
var replyMsg MsgTTYSenderInitReply
|
||||
|
||||
msgInitReq := MsgTTYSenderInitRequest{
|
||||
Salt: senderInfo.Salt,
|
||||
PasswordVerifierA: senderInfo.PasswordVerifierA,
|
||||
}
|
||||
|
||||
// Send the InitRequest message
|
||||
if err = MarshalAndWriteMsg(protoConn.netConnection, msgInitReq); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
// Wait here for the InitReply message
|
||||
if err = ReadAndUnmarshalMsg(protoConn.netConnection, &replyMsg); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
serverInfo = ServerSessionInfo{
|
||||
URLWebReadWrite: replyMsg.ReceiverURLWebReadWrite,
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) InitServer(serverInfo ServerSessionInfo) (senderInfo SenderSessionInfo, err error) {
|
||||
var requestMsg MsgTTYSenderInitRequest
|
||||
|
||||
// Wait here and expect a InitRequest message
|
||||
if err = ReadAndUnmarshalMsg(protoConn.netConnection, &requestMsg); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
// Send back a InitReply message
|
||||
if err = MarshalAndWriteMsg(protoConn.netConnection, MsgTTYSenderInitReply{
|
||||
ReceiverURLWebReadWrite: serverInfo.URLWebReadWrite}); err != nil {
|
||||
return
|
||||
}
|
||||
|
||||
senderInfo = SenderSessionInfo{
|
||||
Salt: requestMsg.Salt,
|
||||
PasswordVerifierA: requestMsg.PasswordVerifierA,
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) InitServerReceiverConn(serverInfo ServerSessionInfo) (receiverInfo ReceiverSessionInfo, err error) {
|
||||
return
|
||||
}
|
||||
|
||||
func (protoConn *TTYProtocolConn) InitReceiverServerConn(receiverInfo ReceiverSessionInfo) (serverInfo ServerSessionInfo, err error) {
|
||||
return
|
||||
}
|
||||
@ -0,0 +1,8 @@
|
||||
# This is the official list of gorilla/mux authors for copyright purposes.
|
||||
#
|
||||
# Please keep the list sorted.
|
||||
|
||||
Google LLC (https://opensource.google.com/)
|
||||
Kamil Kisielk <kamil@kamilkisiel.net>
|
||||
Matt Silverlock <matt@eatsleeprepeat.net>
|
||||
Rodrigo Moraes (https://github.com/moraes)
|
||||
@ -0,0 +1,27 @@
|
||||
Copyright (c) 2012-2018 The Gorilla Authors. All rights reserved.
|
||||
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions are
|
||||
met:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above
|
||||
copyright notice, this list of conditions and the following disclaimer
|
||||
in the documentation and/or other materials provided with the
|
||||
distribution.
|
||||
* Neither the name of Google Inc. nor the names of its
|
||||
contributors may be used to endorse or promote products derived from
|
||||
this software without specific prior written permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
@ -0,0 +1,805 @@
|
||||
# gorilla/mux
|
||||
|
||||
[](https://godoc.org/github.com/gorilla/mux)
|
||||
[](https://circleci.com/gh/gorilla/mux)
|
||||
[](https://sourcegraph.com/github.com/gorilla/mux?badge)
|
||||
|
||||
|
||||
|
||||
https://www.gorillatoolkit.org/pkg/mux
|
||||
|
||||
Package `gorilla/mux` implements a request router and dispatcher for matching incoming requests to
|
||||
their respective handler.
|
||||
|
||||
The name mux stands for "HTTP request multiplexer". Like the standard `http.ServeMux`, `mux.Router` matches incoming requests against a list of registered routes and calls a handler for the route that matches the URL or other conditions. The main features are:
|
||||
|
||||
* It implements the `http.Handler` interface so it is compatible with the standard `http.ServeMux`.
|
||||
* Requests can be matched based on URL host, path, path prefix, schemes, header and query values, HTTP methods or using custom matchers.
|
||||
* URL hosts, paths and query values can have variables with an optional regular expression.
|
||||
* Registered URLs can be built, or "reversed", which helps maintaining references to resources.
|
||||
* Routes can be used as subrouters: nested routes are only tested if the parent route matches. This is useful to define groups of routes that share common conditions like a host, a path prefix or other repeated attributes. As a bonus, this optimizes request matching.
|
||||
|
||||
---
|
||||
|
||||
* [Install](#install)
|
||||
* [Examples](#examples)
|
||||
* [Matching Routes](#matching-routes)
|
||||
* [Static Files](#static-files)
|
||||
* [Serving Single Page Applications](#serving-single-page-applications) (e.g. React, Vue, Ember.js, etc.)
|
||||
* [Registered URLs](#registered-urls)
|
||||
* [Walking Routes](#walking-routes)
|
||||
* [Graceful Shutdown](#graceful-shutdown)
|
||||
* [Middleware](#middleware)
|
||||
* [Handling CORS Requests](#handling-cors-requests)
|
||||
* [Testing Handlers](#testing-handlers)
|
||||
* [Full Example](#full-example)
|
||||
|
||||
---
|
||||
|
||||
## Install
|
||||
|
||||
With a [correctly configured](https://golang.org/doc/install#testing) Go toolchain:
|
||||
|
||||
```sh
|
||||
go get -u github.com/gorilla/mux
|
||||
```
|
||||
|
||||
## Examples
|
||||
|
||||
Let's start registering a couple of URL paths and handlers:
|
||||
|
||||
```go
|
||||
func main() {
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/", HomeHandler)
|
||||
r.HandleFunc("/products", ProductsHandler)
|
||||
r.HandleFunc("/articles", ArticlesHandler)
|
||||
http.Handle("/", r)
|
||||
}
|
||||
```
|
||||
|
||||
Here we register three routes mapping URL paths to handlers. This is equivalent to how `http.HandleFunc()` works: if an incoming request URL matches one of the paths, the corresponding handler is called passing (`http.ResponseWriter`, `*http.Request`) as parameters.
|
||||
|
||||
Paths can have variables. They are defined using the format `{name}` or `{name:pattern}`. If a regular expression pattern is not defined, the matched variable will be anything until the next slash. For example:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/products/{key}", ProductHandler)
|
||||
r.HandleFunc("/articles/{category}/", ArticlesCategoryHandler)
|
||||
r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler)
|
||||
```
|
||||
|
||||
The names are used to create a map of route variables which can be retrieved calling `mux.Vars()`:
|
||||
|
||||
```go
|
||||
func ArticlesCategoryHandler(w http.ResponseWriter, r *http.Request) {
|
||||
vars := mux.Vars(r)
|
||||
w.WriteHeader(http.StatusOK)
|
||||
fmt.Fprintf(w, "Category: %v\n", vars["category"])
|
||||
}
|
||||
```
|
||||
|
||||
And this is all you need to know about the basic usage. More advanced options are explained below.
|
||||
|
||||
### Matching Routes
|
||||
|
||||
Routes can also be restricted to a domain or subdomain. Just define a host pattern to be matched. They can also have variables:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
// Only matches if domain is "www.example.com".
|
||||
r.Host("www.example.com")
|
||||
// Matches a dynamic subdomain.
|
||||
r.Host("{subdomain:[a-z]+}.example.com")
|
||||
```
|
||||
|
||||
There are several other matchers that can be added. To match path prefixes:
|
||||
|
||||
```go
|
||||
r.PathPrefix("/products/")
|
||||
```
|
||||
|
||||
...or HTTP methods:
|
||||
|
||||
```go
|
||||
r.Methods("GET", "POST")
|
||||
```
|
||||
|
||||
...or URL schemes:
|
||||
|
||||
```go
|
||||
r.Schemes("https")
|
||||
```
|
||||
|
||||
...or header values:
|
||||
|
||||
```go
|
||||
r.Headers("X-Requested-With", "XMLHttpRequest")
|
||||
```
|
||||
|
||||
...or query values:
|
||||
|
||||
```go
|
||||
r.Queries("key", "value")
|
||||
```
|
||||
|
||||
...or to use a custom matcher function:
|
||||
|
||||
```go
|
||||
r.MatcherFunc(func(r *http.Request, rm *RouteMatch) bool {
|
||||
return r.ProtoMajor == 0
|
||||
})
|
||||
```
|
||||
|
||||
...and finally, it is possible to combine several matchers in a single route:
|
||||
|
||||
```go
|
||||
r.HandleFunc("/products", ProductsHandler).
|
||||
Host("www.example.com").
|
||||
Methods("GET").
|
||||
Schemes("http")
|
||||
```
|
||||
|
||||
Routes are tested in the order they were added to the router. If two routes match, the first one wins:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/specific", specificHandler)
|
||||
r.PathPrefix("/").Handler(catchAllHandler)
|
||||
```
|
||||
|
||||
Setting the same matching conditions again and again can be boring, so we have a way to group several routes that share the same requirements. We call it "subrouting".
|
||||
|
||||
For example, let's say we have several URLs that should only match when the host is `www.example.com`. Create a route for that host and get a "subrouter" from it:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
s := r.Host("www.example.com").Subrouter()
|
||||
```
|
||||
|
||||
Then register routes in the subrouter:
|
||||
|
||||
```go
|
||||
s.HandleFunc("/products/", ProductsHandler)
|
||||
s.HandleFunc("/products/{key}", ProductHandler)
|
||||
s.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler)
|
||||
```
|
||||
|
||||
The three URL paths we registered above will only be tested if the domain is `www.example.com`, because the subrouter is tested first. This is not only convenient, but also optimizes request matching. You can create subrouters combining any attribute matchers accepted by a route.
|
||||
|
||||
Subrouters can be used to create domain or path "namespaces": you define subrouters in a central place and then parts of the app can register its paths relatively to a given subrouter.
|
||||
|
||||
There's one more thing about subroutes. When a subrouter has a path prefix, the inner routes use it as base for their paths:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
s := r.PathPrefix("/products").Subrouter()
|
||||
// "/products/"
|
||||
s.HandleFunc("/", ProductsHandler)
|
||||
// "/products/{key}/"
|
||||
s.HandleFunc("/{key}/", ProductHandler)
|
||||
// "/products/{key}/details"
|
||||
s.HandleFunc("/{key}/details", ProductDetailsHandler)
|
||||
```
|
||||
|
||||
|
||||
### Static Files
|
||||
|
||||
Note that the path provided to `PathPrefix()` represents a "wildcard": calling
|
||||
`PathPrefix("/static/").Handler(...)` means that the handler will be passed any
|
||||
request that matches "/static/\*". This makes it easy to serve static files with mux:
|
||||
|
||||
```go
|
||||
func main() {
|
||||
var dir string
|
||||
|
||||
flag.StringVar(&dir, "dir", ".", "the directory to serve files from. Defaults to the current dir")
|
||||
flag.Parse()
|
||||
r := mux.NewRouter()
|
||||
|
||||
// This will serve files under http://localhost:8000/static/<filename>
|
||||
r.PathPrefix("/static/").Handler(http.StripPrefix("/static/", http.FileServer(http.Dir(dir))))
|
||||
|
||||
srv := &http.Server{
|
||||
Handler: r,
|
||||
Addr: "127.0.0.1:8000",
|
||||
// Good practice: enforce timeouts for servers you create!
|
||||
WriteTimeout: 15 * time.Second,
|
||||
ReadTimeout: 15 * time.Second,
|
||||
}
|
||||
|
||||
log.Fatal(srv.ListenAndServe())
|
||||
}
|
||||
```
|
||||
|
||||
### Serving Single Page Applications
|
||||
|
||||
Most of the time it makes sense to serve your SPA on a separate web server from your API,
|
||||
but sometimes it's desirable to serve them both from one place. It's possible to write a simple
|
||||
handler for serving your SPA (for use with React Router's [BrowserRouter](https://reacttraining.com/react-router/web/api/BrowserRouter) for example), and leverage
|
||||
mux's powerful routing for your API endpoints.
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"log"
|
||||
"net/http"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"time"
|
||||
|
||||
"github.com/gorilla/mux"
|
||||
)
|
||||
|
||||
// spaHandler implements the http.Handler interface, so we can use it
|
||||
// to respond to HTTP requests. The path to the static directory and
|
||||
// path to the index file within that static directory are used to
|
||||
// serve the SPA in the given static directory.
|
||||
type spaHandler struct {
|
||||
staticPath string
|
||||
indexPath string
|
||||
}
|
||||
|
||||
// ServeHTTP inspects the URL path to locate a file within the static dir
|
||||
// on the SPA handler. If a file is found, it will be served. If not, the
|
||||
// file located at the index path on the SPA handler will be served. This
|
||||
// is suitable behavior for serving an SPA (single page application).
|
||||
func (h spaHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
||||
// get the absolute path to prevent directory traversal
|
||||
path, err := filepath.Abs(r.URL.Path)
|
||||
if err != nil {
|
||||
// if we failed to get the absolute path respond with a 400 bad request
|
||||
// and stop
|
||||
http.Error(w, err.Error(), http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
// prepend the path with the path to the static directory
|
||||
path = filepath.Join(h.staticPath, path)
|
||||
|
||||
// check whether a file exists at the given path
|
||||
_, err = os.Stat(path)
|
||||
if os.IsNotExist(err) {
|
||||
// file does not exist, serve index.html
|
||||
http.ServeFile(w, r, filepath.Join(h.staticPath, h.indexPath))
|
||||
return
|
||||
} else if err != nil {
|
||||
// if we got an error (that wasn't that the file doesn't exist) stating the
|
||||
// file, return a 500 internal server error and stop
|
||||
http.Error(w, err.Error(), http.StatusInternalServerError)
|
||||
return
|
||||
}
|
||||
|
||||
// otherwise, use http.FileServer to serve the static dir
|
||||
http.FileServer(http.Dir(h.staticPath)).ServeHTTP(w, r)
|
||||
}
|
||||
|
||||
func main() {
|
||||
router := mux.NewRouter()
|
||||
|
||||
router.HandleFunc("/api/health", func(w http.ResponseWriter, r *http.Request) {
|
||||
// an example API handler
|
||||
json.NewEncoder(w).Encode(map[string]bool{"ok": true})
|
||||
})
|
||||
|
||||
spa := spaHandler{staticPath: "build", indexPath: "index.html"}
|
||||
router.PathPrefix("/").Handler(spa)
|
||||
|
||||
srv := &http.Server{
|
||||
Handler: router,
|
||||
Addr: "127.0.0.1:8000",
|
||||
// Good practice: enforce timeouts for servers you create!
|
||||
WriteTimeout: 15 * time.Second,
|
||||
ReadTimeout: 15 * time.Second,
|
||||
}
|
||||
|
||||
log.Fatal(srv.ListenAndServe())
|
||||
}
|
||||
```
|
||||
|
||||
### Registered URLs
|
||||
|
||||
Now let's see how to build registered URLs.
|
||||
|
||||
Routes can be named. All routes that define a name can have their URLs built, or "reversed". We define a name calling `Name()` on a route. For example:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
|
||||
Name("article")
|
||||
```
|
||||
|
||||
To build a URL, get the route and call the `URL()` method, passing a sequence of key/value pairs for the route variables. For the previous route, we would do:
|
||||
|
||||
```go
|
||||
url, err := r.Get("article").URL("category", "technology", "id", "42")
|
||||
```
|
||||
|
||||
...and the result will be a `url.URL` with the following path:
|
||||
|
||||
```
|
||||
"/articles/technology/42"
|
||||
```
|
||||
|
||||
This also works for host and query value variables:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
r.Host("{subdomain}.example.com").
|
||||
Path("/articles/{category}/{id:[0-9]+}").
|
||||
Queries("filter", "{filter}").
|
||||
HandlerFunc(ArticleHandler).
|
||||
Name("article")
|
||||
|
||||
// url.String() will be "http://news.example.com/articles/technology/42?filter=gorilla"
|
||||
url, err := r.Get("article").URL("subdomain", "news",
|
||||
"category", "technology",
|
||||
"id", "42",
|
||||
"filter", "gorilla")
|
||||
```
|
||||
|
||||
All variables defined in the route are required, and their values must conform to the corresponding patterns. These requirements guarantee that a generated URL will always match a registered route -- the only exception is for explicitly defined "build-only" routes which never match.
|
||||
|
||||
Regex support also exists for matching Headers within a route. For example, we could do:
|
||||
|
||||
```go
|
||||
r.HeadersRegexp("Content-Type", "application/(text|json)")
|
||||
```
|
||||
|
||||
...and the route will match both requests with a Content-Type of `application/json` as well as `application/text`
|
||||
|
||||
There's also a way to build only the URL host or path for a route: use the methods `URLHost()` or `URLPath()` instead. For the previous route, we would do:
|
||||
|
||||
```go
|
||||
// "http://news.example.com/"
|
||||
host, err := r.Get("article").URLHost("subdomain", "news")
|
||||
|
||||
// "/articles/technology/42"
|
||||
path, err := r.Get("article").URLPath("category", "technology", "id", "42")
|
||||
```
|
||||
|
||||
And if you use subrouters, host and path defined separately can be built as well:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
s := r.Host("{subdomain}.example.com").Subrouter()
|
||||
s.Path("/articles/{category}/{id:[0-9]+}").
|
||||
HandlerFunc(ArticleHandler).
|
||||
Name("article")
|
||||
|
||||
// "http://news.example.com/articles/technology/42"
|
||||
url, err := r.Get("article").URL("subdomain", "news",
|
||||
"category", "technology",
|
||||
"id", "42")
|
||||
```
|
||||
|
||||
### Walking Routes
|
||||
|
||||
The `Walk` function on `mux.Router` can be used to visit all of the routes that are registered on a router. For example,
|
||||
the following prints all of the registered routes:
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net/http"
|
||||
"strings"
|
||||
|
||||
"github.com/gorilla/mux"
|
||||
)
|
||||
|
||||
func handler(w http.ResponseWriter, r *http.Request) {
|
||||
return
|
||||
}
|
||||
|
||||
func main() {
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/", handler)
|
||||
r.HandleFunc("/products", handler).Methods("POST")
|
||||
r.HandleFunc("/articles", handler).Methods("GET")
|
||||
r.HandleFunc("/articles/{id}", handler).Methods("GET", "PUT")
|
||||
r.HandleFunc("/authors", handler).Queries("surname", "{surname}")
|
||||
err := r.Walk(func(route *mux.Route, router *mux.Router, ancestors []*mux.Route) error {
|
||||
pathTemplate, err := route.GetPathTemplate()
|
||||
if err == nil {
|
||||
fmt.Println("ROUTE:", pathTemplate)
|
||||
}
|
||||
pathRegexp, err := route.GetPathRegexp()
|
||||
if err == nil {
|
||||
fmt.Println("Path regexp:", pathRegexp)
|
||||
}
|
||||
queriesTemplates, err := route.GetQueriesTemplates()
|
||||
if err == nil {
|
||||
fmt.Println("Queries templates:", strings.Join(queriesTemplates, ","))
|
||||
}
|
||||
queriesRegexps, err := route.GetQueriesRegexp()
|
||||
if err == nil {
|
||||
fmt.Println("Queries regexps:", strings.Join(queriesRegexps, ","))
|
||||
}
|
||||
methods, err := route.GetMethods()
|
||||
if err == nil {
|
||||
fmt.Println("Methods:", strings.Join(methods, ","))
|
||||
}
|
||||
fmt.Println()
|
||||
return nil
|
||||
})
|
||||
|
||||
if err != nil {
|
||||
fmt.Println(err)
|
||||
}
|
||||
|
||||
http.Handle("/", r)
|
||||
}
|
||||
```
|
||||
|
||||
### Graceful Shutdown
|
||||
|
||||
Go 1.8 introduced the ability to [gracefully shutdown](https://golang.org/doc/go1.8#http_shutdown) a `*http.Server`. Here's how to do that alongside `mux`:
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"flag"
|
||||
"log"
|
||||
"net/http"
|
||||
"os"
|
||||
"os/signal"
|
||||
"time"
|
||||
|
||||
"github.com/gorilla/mux"
|
||||
)
|
||||
|
||||
func main() {
|
||||
var wait time.Duration
|
||||
flag.DurationVar(&wait, "graceful-timeout", time.Second * 15, "the duration for which the server gracefully wait for existing connections to finish - e.g. 15s or 1m")
|
||||
flag.Parse()
|
||||
|
||||
r := mux.NewRouter()
|
||||
// Add your routes as needed
|
||||
|
||||
srv := &http.Server{
|
||||
Addr: "0.0.0.0:8080",
|
||||
// Good practice to set timeouts to avoid Slowloris attacks.
|
||||
WriteTimeout: time.Second * 15,
|
||||
ReadTimeout: time.Second * 15,
|
||||
IdleTimeout: time.Second * 60,
|
||||
Handler: r, // Pass our instance of gorilla/mux in.
|
||||
}
|
||||
|
||||
// Run our server in a goroutine so that it doesn't block.
|
||||
go func() {
|
||||
if err := srv.ListenAndServe(); err != nil {
|
||||
log.Println(err)
|
||||
}
|
||||
}()
|
||||
|
||||
c := make(chan os.Signal, 1)
|
||||
// We'll accept graceful shutdowns when quit via SIGINT (Ctrl+C)
|
||||
// SIGKILL, SIGQUIT or SIGTERM (Ctrl+/) will not be caught.
|
||||
signal.Notify(c, os.Interrupt)
|
||||
|
||||
// Block until we receive our signal.
|
||||
<-c
|
||||
|
||||
// Create a deadline to wait for.
|
||||
ctx, cancel := context.WithTimeout(context.Background(), wait)
|
||||
defer cancel()
|
||||
// Doesn't block if no connections, but will otherwise wait
|
||||
// until the timeout deadline.
|
||||
srv.Shutdown(ctx)
|
||||
// Optionally, you could run srv.Shutdown in a goroutine and block on
|
||||
// <-ctx.Done() if your application should wait for other services
|
||||
// to finalize based on context cancellation.
|
||||
log.Println("shutting down")
|
||||
os.Exit(0)
|
||||
}
|
||||
```
|
||||
|
||||
### Middleware
|
||||
|
||||
Mux supports the addition of middlewares to a [Router](https://godoc.org/github.com/gorilla/mux#Router), which are executed in the order they are added if a match is found, including its subrouters.
|
||||
Middlewares are (typically) small pieces of code which take one request, do something with it, and pass it down to another middleware or the final handler. Some common use cases for middleware are request logging, header manipulation, or `ResponseWriter` hijacking.
|
||||
|
||||
Mux middlewares are defined using the de facto standard type:
|
||||
|
||||
```go
|
||||
type MiddlewareFunc func(http.Handler) http.Handler
|
||||
```
|
||||
|
||||
Typically, the returned handler is a closure which does something with the http.ResponseWriter and http.Request passed to it, and then calls the handler passed as parameter to the MiddlewareFunc. This takes advantage of closures being able access variables from the context where they are created, while retaining the signature enforced by the receivers.
|
||||
|
||||
A very basic middleware which logs the URI of the request being handled could be written as:
|
||||
|
||||
```go
|
||||
func loggingMiddleware(next http.Handler) http.Handler {
|
||||
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
// Do stuff here
|
||||
log.Println(r.RequestURI)
|
||||
// Call the next handler, which can be another middleware in the chain, or the final handler.
|
||||
next.ServeHTTP(w, r)
|
||||
})
|
||||
}
|
||||
```
|
||||
|
||||
Middlewares can be added to a router using `Router.Use()`:
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/", handler)
|
||||
r.Use(loggingMiddleware)
|
||||
```
|
||||
|
||||
A more complex authentication middleware, which maps session token to users, could be written as:
|
||||
|
||||
```go
|
||||
// Define our struct
|
||||
type authenticationMiddleware struct {
|
||||
tokenUsers map[string]string
|
||||
}
|
||||
|
||||
// Initialize it somewhere
|
||||
func (amw *authenticationMiddleware) Populate() {
|
||||
amw.tokenUsers["00000000"] = "user0"
|
||||
amw.tokenUsers["aaaaaaaa"] = "userA"
|
||||
amw.tokenUsers["05f717e5"] = "randomUser"
|
||||
amw.tokenUsers["deadbeef"] = "user0"
|
||||
}
|
||||
|
||||
// Middleware function, which will be called for each request
|
||||
func (amw *authenticationMiddleware) Middleware(next http.Handler) http.Handler {
|
||||
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
token := r.Header.Get("X-Session-Token")
|
||||
|
||||
if user, found := amw.tokenUsers[token]; found {
|
||||
// We found the token in our map
|
||||
log.Printf("Authenticated user %s\n", user)
|
||||
// Pass down the request to the next middleware (or final handler)
|
||||
next.ServeHTTP(w, r)
|
||||
} else {
|
||||
// Write an error and stop the handler chain
|
||||
http.Error(w, "Forbidden", http.StatusForbidden)
|
||||
}
|
||||
})
|
||||
}
|
||||
```
|
||||
|
||||
```go
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/", handler)
|
||||
|
||||
amw := authenticationMiddleware{}
|
||||
amw.Populate()
|
||||
|
||||
r.Use(amw.Middleware)
|
||||
```
|
||||
|
||||
Note: The handler chain will be stopped if your middleware doesn't call `next.ServeHTTP()` with the corresponding parameters. This can be used to abort a request if the middleware writer wants to. Middlewares _should_ write to `ResponseWriter` if they _are_ going to terminate the request, and they _should not_ write to `ResponseWriter` if they _are not_ going to terminate it.
|
||||
|
||||
### Handling CORS Requests
|
||||
|
||||
[CORSMethodMiddleware](https://godoc.org/github.com/gorilla/mux#CORSMethodMiddleware) intends to make it easier to strictly set the `Access-Control-Allow-Methods` response header.
|
||||
|
||||
* You will still need to use your own CORS handler to set the other CORS headers such as `Access-Control-Allow-Origin`
|
||||
* The middleware will set the `Access-Control-Allow-Methods` header to all the method matchers (e.g. `r.Methods(http.MethodGet, http.MethodPut, http.MethodOptions)` -> `Access-Control-Allow-Methods: GET,PUT,OPTIONS`) on a route
|
||||
* If you do not specify any methods, then:
|
||||
> _Important_: there must be an `OPTIONS` method matcher for the middleware to set the headers.
|
||||
|
||||
Here is an example of using `CORSMethodMiddleware` along with a custom `OPTIONS` handler to set all the required CORS headers:
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"net/http"
|
||||
"github.com/gorilla/mux"
|
||||
)
|
||||
|
||||
func main() {
|
||||
r := mux.NewRouter()
|
||||
|
||||
// IMPORTANT: you must specify an OPTIONS method matcher for the middleware to set CORS headers
|
||||
r.HandleFunc("/foo", fooHandler).Methods(http.MethodGet, http.MethodPut, http.MethodPatch, http.MethodOptions)
|
||||
r.Use(mux.CORSMethodMiddleware(r))
|
||||
|
||||
http.ListenAndServe(":8080", r)
|
||||
}
|
||||
|
||||
func fooHandler(w http.ResponseWriter, r *http.Request) {
|
||||
w.Header().Set("Access-Control-Allow-Origin", "*")
|
||||
if r.Method == http.MethodOptions {
|
||||
return
|
||||
}
|
||||
|
||||
w.Write([]byte("foo"))
|
||||
}
|
||||
```
|
||||
|
||||
And an request to `/foo` using something like:
|
||||
|
||||
```bash
|
||||
curl localhost:8080/foo -v
|
||||
```
|
||||
|
||||
Would look like:
|
||||
|
||||
```bash
|
||||
* Trying ::1...
|
||||
* TCP_NODELAY set
|
||||
* Connected to localhost (::1) port 8080 (#0)
|
||||
> GET /foo HTTP/1.1
|
||||
> Host: localhost:8080
|
||||
> User-Agent: curl/7.59.0
|
||||
> Accept: */*
|
||||
>
|
||||
< HTTP/1.1 200 OK
|
||||
< Access-Control-Allow-Methods: GET,PUT,PATCH,OPTIONS
|
||||
< Access-Control-Allow-Origin: *
|
||||
< Date: Fri, 28 Jun 2019 20:13:30 GMT
|
||||
< Content-Length: 3
|
||||
< Content-Type: text/plain; charset=utf-8
|
||||
<
|
||||
* Connection #0 to host localhost left intact
|
||||
foo
|
||||
```
|
||||
|
||||
### Testing Handlers
|
||||
|
||||
Testing handlers in a Go web application is straightforward, and _mux_ doesn't complicate this any further. Given two files: `endpoints.go` and `endpoints_test.go`, here's how we'd test an application using _mux_.
|
||||
|
||||
First, our simple HTTP handler:
|
||||
|
||||
```go
|
||||
// endpoints.go
|
||||
package main
|
||||
|
||||
func HealthCheckHandler(w http.ResponseWriter, r *http.Request) {
|
||||
// A very simple health check.
|
||||
w.Header().Set("Content-Type", "application/json")
|
||||
w.WriteHeader(http.StatusOK)
|
||||
|
||||
// In the future we could report back on the status of our DB, or our cache
|
||||
// (e.g. Redis) by performing a simple PING, and include them in the response.
|
||||
io.WriteString(w, `{"alive": true}`)
|
||||
}
|
||||
|
||||
func main() {
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/health", HealthCheckHandler)
|
||||
|
||||
log.Fatal(http.ListenAndServe("localhost:8080", r))
|
||||
}
|
||||
```
|
||||
|
||||
Our test code:
|
||||
|
||||
```go
|
||||
// endpoints_test.go
|
||||
package main
|
||||
|
||||
import (
|
||||
"net/http"
|
||||
"net/http/httptest"
|
||||
"testing"
|
||||
)
|
||||
|
||||
func TestHealthCheckHandler(t *testing.T) {
|
||||
// Create a request to pass to our handler. We don't have any query parameters for now, so we'll
|
||||
// pass 'nil' as the third parameter.
|
||||
req, err := http.NewRequest("GET", "/health", nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
// We create a ResponseRecorder (which satisfies http.ResponseWriter) to record the response.
|
||||
rr := httptest.NewRecorder()
|
||||
handler := http.HandlerFunc(HealthCheckHandler)
|
||||
|
||||
// Our handlers satisfy http.Handler, so we can call their ServeHTTP method
|
||||
// directly and pass in our Request and ResponseRecorder.
|
||||
handler.ServeHTTP(rr, req)
|
||||
|
||||
// Check the status code is what we expect.
|
||||
if status := rr.Code; status != http.StatusOK {
|
||||
t.Errorf("handler returned wrong status code: got %v want %v",
|
||||
status, http.StatusOK)
|
||||
}
|
||||
|
||||
// Check the response body is what we expect.
|
||||
expected := `{"alive": true}`
|
||||
if rr.Body.String() != expected {
|
||||
t.Errorf("handler returned unexpected body: got %v want %v",
|
||||
rr.Body.String(), expected)
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
In the case that our routes have [variables](#examples), we can pass those in the request. We could write
|
||||
[table-driven tests](https://dave.cheney.net/2013/06/09/writing-table-driven-tests-in-go) to test multiple
|
||||
possible route variables as needed.
|
||||
|
||||
```go
|
||||
// endpoints.go
|
||||
func main() {
|
||||
r := mux.NewRouter()
|
||||
// A route with a route variable:
|
||||
r.HandleFunc("/metrics/{type}", MetricsHandler)
|
||||
|
||||
log.Fatal(http.ListenAndServe("localhost:8080", r))
|
||||
}
|
||||
```
|
||||
|
||||
Our test file, with a table-driven test of `routeVariables`:
|
||||
|
||||
```go
|
||||
// endpoints_test.go
|
||||
func TestMetricsHandler(t *testing.T) {
|
||||
tt := []struct{
|
||||
routeVariable string
|
||||
shouldPass bool
|
||||
}{
|
||||
{"goroutines", true},
|
||||
{"heap", true},
|
||||
{"counters", true},
|
||||
{"queries", true},
|
||||
{"adhadaeqm3k", false},
|
||||
}
|
||||
|
||||
for _, tc := range tt {
|
||||
path := fmt.Sprintf("/metrics/%s", tc.routeVariable)
|
||||
req, err := http.NewRequest("GET", path, nil)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
rr := httptest.NewRecorder()
|
||||
|
||||
// Need to create a router that we can pass the request through so that the vars will be added to the context
|
||||
router := mux.NewRouter()
|
||||
router.HandleFunc("/metrics/{type}", MetricsHandler)
|
||||
router.ServeHTTP(rr, req)
|
||||
|
||||
// In this case, our MetricsHandler returns a non-200 response
|
||||
// for a route variable it doesn't know about.
|
||||
if rr.Code == http.StatusOK && !tc.shouldPass {
|
||||
t.Errorf("handler should have failed on routeVariable %s: got %v want %v",
|
||||
tc.routeVariable, rr.Code, http.StatusOK)
|
||||
}
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
## Full Example
|
||||
|
||||
Here's a complete, runnable example of a small `mux` based server:
|
||||
|
||||
```go
|
||||
package main
|
||||
|
||||
import (
|
||||
"net/http"
|
||||
"log"
|
||||
"github.com/gorilla/mux"
|
||||
)
|
||||
|
||||
func YourHandler(w http.ResponseWriter, r *http.Request) {
|
||||
w.Write([]byte("Gorilla!\n"))
|
||||
}
|
||||
|
||||
func main() {
|
||||
r := mux.NewRouter()
|
||||
// Routes consist of a path and a handler function.
|
||||
r.HandleFunc("/", YourHandler)
|
||||
|
||||
// Bind to a port and pass our router in
|
||||
log.Fatal(http.ListenAndServe(":8000", r))
|
||||
}
|
||||
```
|
||||
|
||||
## License
|
||||
|
||||
BSD licensed. See the LICENSE file for details.
|
||||
@ -0,0 +1,306 @@
|
||||
// Copyright 2012 The Gorilla Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
/*
|
||||
Package mux implements a request router and dispatcher.
|
||||
|
||||
The name mux stands for "HTTP request multiplexer". Like the standard
|
||||
http.ServeMux, mux.Router matches incoming requests against a list of
|
||||
registered routes and calls a handler for the route that matches the URL
|
||||
or other conditions. The main features are:
|
||||
|
||||
* Requests can be matched based on URL host, path, path prefix, schemes,
|
||||
header and query values, HTTP methods or using custom matchers.
|
||||
* URL hosts, paths and query values can have variables with an optional
|
||||
regular expression.
|
||||
* Registered URLs can be built, or "reversed", which helps maintaining
|
||||
references to resources.
|
||||
* Routes can be used as subrouters: nested routes are only tested if the
|
||||
parent route matches. This is useful to define groups of routes that
|
||||
share common conditions like a host, a path prefix or other repeated
|
||||
attributes. As a bonus, this optimizes request matching.
|
||||
* It implements the http.Handler interface so it is compatible with the
|
||||
standard http.ServeMux.
|
||||
|
||||
Let's start registering a couple of URL paths and handlers:
|
||||
|
||||
func main() {
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/", HomeHandler)
|
||||
r.HandleFunc("/products", ProductsHandler)
|
||||
r.HandleFunc("/articles", ArticlesHandler)
|
||||
http.Handle("/", r)
|
||||
}
|
||||
|
||||
Here we register three routes mapping URL paths to handlers. This is
|
||||
equivalent to how http.HandleFunc() works: if an incoming request URL matches
|
||||
one of the paths, the corresponding handler is called passing
|
||||
(http.ResponseWriter, *http.Request) as parameters.
|
||||
|
||||
Paths can have variables. They are defined using the format {name} or
|
||||
{name:pattern}. If a regular expression pattern is not defined, the matched
|
||||
variable will be anything until the next slash. For example:
|
||||
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/products/{key}", ProductHandler)
|
||||
r.HandleFunc("/articles/{category}/", ArticlesCategoryHandler)
|
||||
r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler)
|
||||
|
||||
Groups can be used inside patterns, as long as they are non-capturing (?:re). For example:
|
||||
|
||||
r.HandleFunc("/articles/{category}/{sort:(?:asc|desc|new)}", ArticlesCategoryHandler)
|
||||
|
||||
The names are used to create a map of route variables which can be retrieved
|
||||
calling mux.Vars():
|
||||
|
||||
vars := mux.Vars(request)
|
||||
category := vars["category"]
|
||||
|
||||
Note that if any capturing groups are present, mux will panic() during parsing. To prevent
|
||||
this, convert any capturing groups to non-capturing, e.g. change "/{sort:(asc|desc)}" to
|
||||
"/{sort:(?:asc|desc)}". This is a change from prior versions which behaved unpredictably
|
||||
when capturing groups were present.
|
||||
|
||||
And this is all you need to know about the basic usage. More advanced options
|
||||
are explained below.
|
||||
|
||||
Routes can also be restricted to a domain or subdomain. Just define a host
|
||||
pattern to be matched. They can also have variables:
|
||||
|
||||
r := mux.NewRouter()
|
||||
// Only matches if domain is "www.example.com".
|
||||
r.Host("www.example.com")
|
||||
// Matches a dynamic subdomain.
|
||||
r.Host("{subdomain:[a-z]+}.domain.com")
|
||||
|
||||
There are several other matchers that can be added. To match path prefixes:
|
||||
|
||||
r.PathPrefix("/products/")
|
||||
|
||||
...or HTTP methods:
|
||||
|
||||
r.Methods("GET", "POST")
|
||||
|
||||
...or URL schemes:
|
||||
|
||||
r.Schemes("https")
|
||||
|
||||
...or header values:
|
||||
|
||||
r.Headers("X-Requested-With", "XMLHttpRequest")
|
||||
|
||||
...or query values:
|
||||
|
||||
r.Queries("key", "value")
|
||||
|
||||
...or to use a custom matcher function:
|
||||
|
||||
r.MatcherFunc(func(r *http.Request, rm *RouteMatch) bool {
|
||||
return r.ProtoMajor == 0
|
||||
})
|
||||
|
||||
...and finally, it is possible to combine several matchers in a single route:
|
||||
|
||||
r.HandleFunc("/products", ProductsHandler).
|
||||
Host("www.example.com").
|
||||
Methods("GET").
|
||||
Schemes("http")
|
||||
|
||||
Setting the same matching conditions again and again can be boring, so we have
|
||||
a way to group several routes that share the same requirements.
|
||||
We call it "subrouting".
|
||||
|
||||
For example, let's say we have several URLs that should only match when the
|
||||
host is "www.example.com". Create a route for that host and get a "subrouter"
|
||||
from it:
|
||||
|
||||
r := mux.NewRouter()
|
||||
s := r.Host("www.example.com").Subrouter()
|
||||
|
||||
Then register routes in the subrouter:
|
||||
|
||||
s.HandleFunc("/products/", ProductsHandler)
|
||||
s.HandleFunc("/products/{key}", ProductHandler)
|
||||
s.HandleFunc("/articles/{category}/{id:[0-9]+}"), ArticleHandler)
|
||||
|
||||
The three URL paths we registered above will only be tested if the domain is
|
||||
"www.example.com", because the subrouter is tested first. This is not
|
||||
only convenient, but also optimizes request matching. You can create
|
||||
subrouters combining any attribute matchers accepted by a route.
|
||||
|
||||
Subrouters can be used to create domain or path "namespaces": you define
|
||||
subrouters in a central place and then parts of the app can register its
|
||||
paths relatively to a given subrouter.
|
||||
|
||||
There's one more thing about subroutes. When a subrouter has a path prefix,
|
||||
the inner routes use it as base for their paths:
|
||||
|
||||
r := mux.NewRouter()
|
||||
s := r.PathPrefix("/products").Subrouter()
|
||||
// "/products/"
|
||||
s.HandleFunc("/", ProductsHandler)
|
||||
// "/products/{key}/"
|
||||
s.HandleFunc("/{key}/", ProductHandler)
|
||||
// "/products/{key}/details"
|
||||
s.HandleFunc("/{key}/details", ProductDetailsHandler)
|
||||
|
||||
Note that the path provided to PathPrefix() represents a "wildcard": calling
|
||||
PathPrefix("/static/").Handler(...) means that the handler will be passed any
|
||||
request that matches "/static/*". This makes it easy to serve static files with mux:
|
||||
|
||||
func main() {
|
||||
var dir string
|
||||
|
||||
flag.StringVar(&dir, "dir", ".", "the directory to serve files from. Defaults to the current dir")
|
||||
flag.Parse()
|
||||
r := mux.NewRouter()
|
||||
|
||||
// This will serve files under http://localhost:8000/static/<filename>
|
||||
r.PathPrefix("/static/").Handler(http.StripPrefix("/static/", http.FileServer(http.Dir(dir))))
|
||||
|
||||
srv := &http.Server{
|
||||
Handler: r,
|
||||
Addr: "127.0.0.1:8000",
|
||||
// Good practice: enforce timeouts for servers you create!
|
||||
WriteTimeout: 15 * time.Second,
|
||||
ReadTimeout: 15 * time.Second,
|
||||
}
|
||||
|
||||
log.Fatal(srv.ListenAndServe())
|
||||
}
|
||||
|
||||
Now let's see how to build registered URLs.
|
||||
|
||||
Routes can be named. All routes that define a name can have their URLs built,
|
||||
or "reversed". We define a name calling Name() on a route. For example:
|
||||
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
|
||||
Name("article")
|
||||
|
||||
To build a URL, get the route and call the URL() method, passing a sequence of
|
||||
key/value pairs for the route variables. For the previous route, we would do:
|
||||
|
||||
url, err := r.Get("article").URL("category", "technology", "id", "42")
|
||||
|
||||
...and the result will be a url.URL with the following path:
|
||||
|
||||
"/articles/technology/42"
|
||||
|
||||
This also works for host and query value variables:
|
||||
|
||||
r := mux.NewRouter()
|
||||
r.Host("{subdomain}.domain.com").
|
||||
Path("/articles/{category}/{id:[0-9]+}").
|
||||
Queries("filter", "{filter}").
|
||||
HandlerFunc(ArticleHandler).
|
||||
Name("article")
|
||||
|
||||
// url.String() will be "http://news.domain.com/articles/technology/42?filter=gorilla"
|
||||
url, err := r.Get("article").URL("subdomain", "news",
|
||||
"category", "technology",
|
||||
"id", "42",
|
||||
"filter", "gorilla")
|
||||
|
||||
All variables defined in the route are required, and their values must
|
||||
conform to the corresponding patterns. These requirements guarantee that a
|
||||
generated URL will always match a registered route -- the only exception is
|
||||
for explicitly defined "build-only" routes which never match.
|
||||
|
||||
Regex support also exists for matching Headers within a route. For example, we could do:
|
||||
|
||||
r.HeadersRegexp("Content-Type", "application/(text|json)")
|
||||
|
||||
...and the route will match both requests with a Content-Type of `application/json` as well as
|
||||
`application/text`
|
||||
|
||||
There's also a way to build only the URL host or path for a route:
|
||||
use the methods URLHost() or URLPath() instead. For the previous route,
|
||||
we would do:
|
||||
|
||||
// "http://news.domain.com/"
|
||||
host, err := r.Get("article").URLHost("subdomain", "news")
|
||||
|
||||
// "/articles/technology/42"
|
||||
path, err := r.Get("article").URLPath("category", "technology", "id", "42")
|
||||
|
||||
And if you use subrouters, host and path defined separately can be built
|
||||
as well:
|
||||
|
||||
r := mux.NewRouter()
|
||||
s := r.Host("{subdomain}.domain.com").Subrouter()
|
||||
s.Path("/articles/{category}/{id:[0-9]+}").
|
||||
HandlerFunc(ArticleHandler).
|
||||
Name("article")
|
||||
|
||||
// "http://news.domain.com/articles/technology/42"
|
||||
url, err := r.Get("article").URL("subdomain", "news",
|
||||
"category", "technology",
|
||||
"id", "42")
|
||||
|
||||
Mux supports the addition of middlewares to a Router, which are executed in the order they are added if a match is found, including its subrouters. Middlewares are (typically) small pieces of code which take one request, do something with it, and pass it down to another middleware or the final handler. Some common use cases for middleware are request logging, header manipulation, or ResponseWriter hijacking.
|
||||
|
||||
type MiddlewareFunc func(http.Handler) http.Handler
|
||||
|
||||
Typically, the returned handler is a closure which does something with the http.ResponseWriter and http.Request passed to it, and then calls the handler passed as parameter to the MiddlewareFunc (closures can access variables from the context where they are created).
|
||||
|
||||
A very basic middleware which logs the URI of the request being handled could be written as:
|
||||
|
||||
func simpleMw(next http.Handler) http.Handler {
|
||||
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
// Do stuff here
|
||||
log.Println(r.RequestURI)
|
||||
// Call the next handler, which can be another middleware in the chain, or the final handler.
|
||||
next.ServeHTTP(w, r)
|
||||
})
|
||||
}
|
||||
|
||||
Middlewares can be added to a router using `Router.Use()`:
|
||||
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/", handler)
|
||||
r.Use(simpleMw)
|
||||
|
||||
A more complex authentication middleware, which maps session token to users, could be written as:
|
||||
|
||||
// Define our struct
|
||||
type authenticationMiddleware struct {
|
||||
tokenUsers map[string]string
|
||||
}
|
||||
|
||||
// Initialize it somewhere
|
||||
func (amw *authenticationMiddleware) Populate() {
|
||||
amw.tokenUsers["00000000"] = "user0"
|
||||
amw.tokenUsers["aaaaaaaa"] = "userA"
|
||||
amw.tokenUsers["05f717e5"] = "randomUser"
|
||||
amw.tokenUsers["deadbeef"] = "user0"
|
||||
}
|
||||
|
||||
// Middleware function, which will be called for each request
|
||||
func (amw *authenticationMiddleware) Middleware(next http.Handler) http.Handler {
|
||||
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
||||
token := r.Header.Get("X-Session-Token")
|
||||
|
||||
if user, found := amw.tokenUsers[token]; found {
|
||||
// We found the token in our map
|
||||
log.Printf("Authenticated user %s\n", user)
|
||||
next.ServeHTTP(w, r)
|
||||
} else {
|
||||
http.Error(w, "Forbidden", http.StatusForbidden)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
r := mux.NewRouter()
|
||||
r.HandleFunc("/", handler)
|
||||
|
||||
amw := authenticationMiddleware{tokenUsers: make(map[string]string)}
|
||||
amw.Populate()
|
||||
|
||||
r.Use(amw.Middleware)
|
||||
|
||||
Note: The handler chain will be stopped if your middleware doesn't call `next.ServeHTTP()` with the corresponding parameters. This can be used to abort a request if the middleware writer wants to.
|
||||
|
||||
*/
|
||||
package mux
|
||||
@ -0,0 +1,3 @@
|
||||
module github.com/gorilla/mux
|
||||
|
||||
go 1.12
|
||||
@ -0,0 +1,74 @@
|
||||
package mux
|
||||
|
||||
import (
|
||||
"net/http"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// MiddlewareFunc is a function which receives an http.Handler and returns another http.Handler.
|
||||
// Typically, the returned handler is a closure which does something with the http.ResponseWriter and http.Request passed
|
||||
// to it, and then calls the handler passed as parameter to the MiddlewareFunc.
|
||||
type MiddlewareFunc func(http.Handler) http.Handler
|
||||
|
||||
// middleware interface is anything which implements a MiddlewareFunc named Middleware.
|
||||
type middleware interface {
|
||||
Middleware(handler http.Handler) http.Handler
|
||||
}
|
||||
|
||||
// Middleware allows MiddlewareFunc to implement the middleware interface.
|
||||
func (mw MiddlewareFunc) Middleware(handler http.Handler) http.Handler {
|
||||
return mw(handler)
|
||||
}
|
||||
|
||||
// Use appends a MiddlewareFunc to the chain. Middleware can be used to intercept or otherwise modify requests and/or responses, and are executed in the order that they are applied to the Router.
|
||||
func (r *Router) Use(mwf ...MiddlewareFunc) {
|
||||
for _, fn := range mwf {
|
||||
r.middlewares = append(r.middlewares, fn)
|
||||
}
|
||||
}
|
||||
|
||||
// useInterface appends a middleware to the chain. Middleware can be used to intercept or otherwise modify requests and/or responses, and are executed in the order that they are applied to the Router.
|
||||
func (r *Router) useInterface(mw middleware) {
|
||||
r.middlewares = append(r.middlewares, mw)
|
||||
}
|
||||
|
||||
// CORSMethodMiddleware automatically sets the Access-Control-Allow-Methods response header
|
||||
// on requests for routes that have an OPTIONS method matcher to all the method matchers on
|
||||
// the route. Routes that do not explicitly handle OPTIONS requests will not be processed
|
||||
// by the middleware. See examples for usage.
|
||||
func CORSMethodMiddleware(r *Router) MiddlewareFunc {
|
||||
return func(next http.Handler) http.Handler {
|
||||
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
|
||||
allMethods, err := getAllMethodsForRoute(r, req)
|
||||
if err == nil {
|
||||
for _, v := range allMethods {
|
||||
if v == http.MethodOptions {
|
||||
w.Header().Set("Access-Control-Allow-Methods", strings.Join(allMethods, ","))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
next.ServeHTTP(w, req)
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// getAllMethodsForRoute returns all the methods from method matchers matching a given
|
||||
// request.
|
||||
func getAllMethodsForRoute(r *Router, req *http.Request) ([]string, error) {
|
||||
var allMethods []string
|
||||
|
||||
for _, route := range r.routes {
|
||||
var match RouteMatch
|
||||
if route.Match(req, &match) || match.MatchErr == ErrMethodMismatch {
|
||||
methods, err := route.GetMethods()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
allMethods = append(allMethods, methods...)
|
||||
}
|
||||
}
|
||||
|
||||
return allMethods, nil
|
||||
}
|
||||
@ -0,0 +1,606 @@
|
||||
// Copyright 2012 The Gorilla Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package mux
|
||||
|
||||
import (
|
||||
"context"
|
||||
"errors"
|
||||
"fmt"
|
||||
"net/http"
|
||||
"path"
|
||||
"regexp"
|
||||
)
|
||||
|
||||
var (
|
||||
// ErrMethodMismatch is returned when the method in the request does not match
|
||||
// the method defined against the route.
|
||||
ErrMethodMismatch = errors.New("method is not allowed")
|
||||
// ErrNotFound is returned when no route match is found.
|
||||
ErrNotFound = errors.New("no matching route was found")
|
||||
)
|
||||
|
||||
// NewRouter returns a new router instance.
|
||||
func NewRouter() *Router {
|
||||
return &Router{namedRoutes: make(map[string]*Route)}
|
||||
}
|
||||
|
||||
// Router registers routes to be matched and dispatches a handler.
|
||||
//
|
||||
// It implements the http.Handler interface, so it can be registered to serve
|
||||
// requests:
|
||||
//
|
||||
// var router = mux.NewRouter()
|
||||
//
|
||||
// func main() {
|
||||
// http.Handle("/", router)
|
||||
// }
|
||||
//
|
||||
// Or, for Google App Engine, register it in a init() function:
|
||||
//
|
||||
// func init() {
|
||||
// http.Handle("/", router)
|
||||
// }
|
||||
//
|
||||
// This will send all incoming requests to the router.
|
||||
type Router struct {
|
||||
// Configurable Handler to be used when no route matches.
|
||||
NotFoundHandler http.Handler
|
||||
|
||||
// Configurable Handler to be used when the request method does not match the route.
|
||||
MethodNotAllowedHandler http.Handler
|
||||
|
||||
// Routes to be matched, in order.
|
||||
routes []*Route
|
||||
|
||||
// Routes by name for URL building.
|
||||
namedRoutes map[string]*Route
|
||||
|
||||
// If true, do not clear the request context after handling the request.
|
||||
//
|
||||
// Deprecated: No effect, since the context is stored on the request itself.
|
||||
KeepContext bool
|
||||
|
||||
// Slice of middlewares to be called after a match is found
|
||||
middlewares []middleware
|
||||
|
||||
// configuration shared with `Route`
|
||||
routeConf
|
||||
}
|
||||
|
||||
// common route configuration shared between `Router` and `Route`
|
||||
type routeConf struct {
|
||||
// If true, "/path/foo%2Fbar/to" will match the path "/path/{var}/to"
|
||||
useEncodedPath bool
|
||||
|
||||
// If true, when the path pattern is "/path/", accessing "/path" will
|
||||
// redirect to the former and vice versa.
|
||||
strictSlash bool
|
||||
|
||||
// If true, when the path pattern is "/path//to", accessing "/path//to"
|
||||
// will not redirect
|
||||
skipClean bool
|
||||
|
||||
// Manager for the variables from host and path.
|
||||
regexp routeRegexpGroup
|
||||
|
||||
// List of matchers.
|
||||
matchers []matcher
|
||||
|
||||
// The scheme used when building URLs.
|
||||
buildScheme string
|
||||
|
||||
buildVarsFunc BuildVarsFunc
|
||||
}
|
||||
|
||||
// returns an effective deep copy of `routeConf`
|
||||
func copyRouteConf(r routeConf) routeConf {
|
||||
c := r
|
||||
|
||||
if r.regexp.path != nil {
|
||||
c.regexp.path = copyRouteRegexp(r.regexp.path)
|
||||
}
|
||||
|
||||
if r.regexp.host != nil {
|
||||
c.regexp.host = copyRouteRegexp(r.regexp.host)
|
||||
}
|
||||
|
||||
c.regexp.queries = make([]*routeRegexp, 0, len(r.regexp.queries))
|
||||
for _, q := range r.regexp.queries {
|
||||
c.regexp.queries = append(c.regexp.queries, copyRouteRegexp(q))
|
||||
}
|
||||
|
||||
c.matchers = make([]matcher, len(r.matchers))
|
||||
copy(c.matchers, r.matchers)
|
||||
|
||||
return c
|
||||
}
|
||||
|
||||
func copyRouteRegexp(r *routeRegexp) *routeRegexp {
|
||||
c := *r
|
||||
return &c
|
||||
}
|
||||
|
||||
// Match attempts to match the given request against the router's registered routes.
|
||||
//
|
||||
// If the request matches a route of this router or one of its subrouters the Route,
|
||||
// Handler, and Vars fields of the the match argument are filled and this function
|
||||
// returns true.
|
||||
//
|
||||
// If the request does not match any of this router's or its subrouters' routes
|
||||
// then this function returns false. If available, a reason for the match failure
|
||||
// will be filled in the match argument's MatchErr field. If the match failure type
|
||||
// (eg: not found) has a registered handler, the handler is assigned to the Handler
|
||||
// field of the match argument.
|
||||
func (r *Router) Match(req *http.Request, match *RouteMatch) bool {
|
||||
for _, route := range r.routes {
|
||||
if route.Match(req, match) {
|
||||
// Build middleware chain if no error was found
|
||||
if match.MatchErr == nil {
|
||||
for i := len(r.middlewares) - 1; i >= 0; i-- {
|
||||
match.Handler = r.middlewares[i].Middleware(match.Handler)
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
}
|
||||
|
||||
if match.MatchErr == ErrMethodMismatch {
|
||||
if r.MethodNotAllowedHandler != nil {
|
||||
match.Handler = r.MethodNotAllowedHandler
|
||||
return true
|
||||
}
|
||||
|
||||
return false
|
||||
}
|
||||
|
||||
// Closest match for a router (includes sub-routers)
|
||||
if r.NotFoundHandler != nil {
|
||||
match.Handler = r.NotFoundHandler
|
||||
match.MatchErr = ErrNotFound
|
||||
return true
|
||||
}
|
||||
|
||||
match.MatchErr = ErrNotFound
|
||||
return false
|
||||
}
|
||||
|
||||
// ServeHTTP dispatches the handler registered in the matched route.
|
||||
//
|
||||
// When there is a match, the route variables can be retrieved calling
|
||||
// mux.Vars(request).
|
||||
func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
|
||||
if !r.skipClean {
|
||||
path := req.URL.Path
|
||||
if r.useEncodedPath {
|
||||
path = req.URL.EscapedPath()
|
||||
}
|
||||
// Clean path to canonical form and redirect.
|
||||
if p := cleanPath(path); p != path {
|
||||
|
||||
// Added 3 lines (Philip Schlump) - It was dropping the query string and #whatever from query.
|
||||
// This matches with fix in go 1.2 r.c. 4 for same problem. Go Issue:
|
||||
// http://code.google.com/p/go/issues/detail?id=5252
|
||||
url := *req.URL
|
||||
url.Path = p
|
||||
p = url.String()
|
||||
|
||||
w.Header().Set("Location", p)
|
||||
w.WriteHeader(http.StatusMovedPermanently)
|
||||
return
|
||||
}
|
||||
}
|
||||
var match RouteMatch
|
||||
var handler http.Handler
|
||||
if r.Match(req, &match) {
|
||||
handler = match.Handler
|
||||
req = requestWithVars(req, match.Vars)
|
||||
req = requestWithRoute(req, match.Route)
|
||||
}
|
||||
|
||||
if handler == nil && match.MatchErr == ErrMethodMismatch {
|
||||
handler = methodNotAllowedHandler()
|
||||
}
|
||||
|
||||
if handler == nil {
|
||||
handler = http.NotFoundHandler()
|
||||
}
|
||||
|
||||
handler.ServeHTTP(w, req)
|
||||
}
|
||||
|
||||
// Get returns a route registered with the given name.
|
||||
func (r *Router) Get(name string) *Route {
|
||||
return r.namedRoutes[name]
|
||||
}
|
||||
|
||||
// GetRoute returns a route registered with the given name. This method
|
||||
// was renamed to Get() and remains here for backwards compatibility.
|
||||
func (r *Router) GetRoute(name string) *Route {
|
||||
return r.namedRoutes[name]
|
||||
}
|
||||
|
||||
// StrictSlash defines the trailing slash behavior for new routes. The initial
|
||||
// value is false.
|
||||
//
|
||||
// When true, if the route path is "/path/", accessing "/path" will perform a redirect
|
||||
// to the former and vice versa. In other words, your application will always
|
||||
// see the path as specified in the route.
|
||||
//
|
||||
// When false, if the route path is "/path", accessing "/path/" will not match
|
||||
// this route and vice versa.
|
||||
//
|
||||
// The re-direct is a HTTP 301 (Moved Permanently). Note that when this is set for
|
||||
// routes with a non-idempotent method (e.g. POST, PUT), the subsequent re-directed
|
||||
// request will be made as a GET by most clients. Use middleware or client settings
|
||||
// to modify this behaviour as needed.
|
||||
//
|
||||
// Special case: when a route sets a path prefix using the PathPrefix() method,
|
||||
// strict slash is ignored for that route because the redirect behavior can't
|
||||
// be determined from a prefix alone. However, any subrouters created from that
|
||||
// route inherit the original StrictSlash setting.
|
||||
func (r *Router) StrictSlash(value bool) *Router {
|
||||
r.strictSlash = value
|
||||
return r
|
||||
}
|
||||
|
||||
// SkipClean defines the path cleaning behaviour for new routes. The initial
|
||||
// value is false. Users should be careful about which routes are not cleaned
|
||||
//
|
||||
// When true, if the route path is "/path//to", it will remain with the double
|
||||
// slash. This is helpful if you have a route like: /fetch/http://xkcd.com/534/
|
||||
//
|
||||
// When false, the path will be cleaned, so /fetch/http://xkcd.com/534/ will
|
||||
// become /fetch/http/xkcd.com/534
|
||||
func (r *Router) SkipClean(value bool) *Router {
|
||||
r.skipClean = value
|
||||
return r
|
||||
}
|
||||
|
||||
// UseEncodedPath tells the router to match the encoded original path
|
||||
// to the routes.
|
||||
// For eg. "/path/foo%2Fbar/to" will match the path "/path/{var}/to".
|
||||
//
|
||||
// If not called, the router will match the unencoded path to the routes.
|
||||
// For eg. "/path/foo%2Fbar/to" will match the path "/path/foo/bar/to"
|
||||
func (r *Router) UseEncodedPath() *Router {
|
||||
r.useEncodedPath = true
|
||||
return r
|
||||
}
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// Route factories
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
// NewRoute registers an empty route.
|
||||
func (r *Router) NewRoute() *Route {
|
||||
// initialize a route with a copy of the parent router's configuration
|
||||
route := &Route{routeConf: copyRouteConf(r.routeConf), namedRoutes: r.namedRoutes}
|
||||
r.routes = append(r.routes, route)
|
||||
return route
|
||||
}
|
||||
|
||||
// Name registers a new route with a name.
|
||||
// See Route.Name().
|
||||
func (r *Router) Name(name string) *Route {
|
||||
return r.NewRoute().Name(name)
|
||||
}
|
||||
|
||||
// Handle registers a new route with a matcher for the URL path.
|
||||
// See Route.Path() and Route.Handler().
|
||||
func (r *Router) Handle(path string, handler http.Handler) *Route {
|
||||
return r.NewRoute().Path(path).Handler(handler)
|
||||
}
|
||||
|
||||
// HandleFunc registers a new route with a matcher for the URL path.
|
||||
// See Route.Path() and Route.HandlerFunc().
|
||||
func (r *Router) HandleFunc(path string, f func(http.ResponseWriter,
|
||||
*http.Request)) *Route {
|
||||
return r.NewRoute().Path(path).HandlerFunc(f)
|
||||
}
|
||||
|
||||
// Headers registers a new route with a matcher for request header values.
|
||||
// See Route.Headers().
|
||||
func (r *Router) Headers(pairs ...string) *Route {
|
||||
return r.NewRoute().Headers(pairs...)
|
||||
}
|
||||
|
||||
// Host registers a new route with a matcher for the URL host.
|
||||
// See Route.Host().
|
||||
func (r *Router) Host(tpl string) *Route {
|
||||
return r.NewRoute().Host(tpl)
|
||||
}
|
||||
|
||||
// MatcherFunc registers a new route with a custom matcher function.
|
||||
// See Route.MatcherFunc().
|
||||
func (r *Router) MatcherFunc(f MatcherFunc) *Route {
|
||||
return r.NewRoute().MatcherFunc(f)
|
||||
}
|
||||
|
||||
// Methods registers a new route with a matcher for HTTP methods.
|
||||
// See Route.Methods().
|
||||
func (r *Router) Methods(methods ...string) *Route {
|
||||
return r.NewRoute().Methods(methods...)
|
||||
}
|
||||
|
||||
// Path registers a new route with a matcher for the URL path.
|
||||
// See Route.Path().
|
||||
func (r *Router) Path(tpl string) *Route {
|
||||
return r.NewRoute().Path(tpl)
|
||||
}
|
||||
|
||||
// PathPrefix registers a new route with a matcher for the URL path prefix.
|
||||
// See Route.PathPrefix().
|
||||
func (r *Router) PathPrefix(tpl string) *Route {
|
||||
return r.NewRoute().PathPrefix(tpl)
|
||||
}
|
||||
|
||||
// Queries registers a new route with a matcher for URL query values.
|
||||
// See Route.Queries().
|
||||
func (r *Router) Queries(pairs ...string) *Route {
|
||||
return r.NewRoute().Queries(pairs...)
|
||||
}
|
||||
|
||||
// Schemes registers a new route with a matcher for URL schemes.
|
||||
// See Route.Schemes().
|
||||
func (r *Router) Schemes(schemes ...string) *Route {
|
||||
return r.NewRoute().Schemes(schemes...)
|
||||
}
|
||||
|
||||
// BuildVarsFunc registers a new route with a custom function for modifying
|
||||
// route variables before building a URL.
|
||||
func (r *Router) BuildVarsFunc(f BuildVarsFunc) *Route {
|
||||
return r.NewRoute().BuildVarsFunc(f)
|
||||
}
|
||||
|
||||
// Walk walks the router and all its sub-routers, calling walkFn for each route
|
||||
// in the tree. The routes are walked in the order they were added. Sub-routers
|
||||
// are explored depth-first.
|
||||
func (r *Router) Walk(walkFn WalkFunc) error {
|
||||
return r.walk(walkFn, []*Route{})
|
||||
}
|
||||
|
||||
// SkipRouter is used as a return value from WalkFuncs to indicate that the
|
||||
// router that walk is about to descend down to should be skipped.
|
||||
var SkipRouter = errors.New("skip this router")
|
||||
|
||||
// WalkFunc is the type of the function called for each route visited by Walk.
|
||||
// At every invocation, it is given the current route, and the current router,
|
||||
// and a list of ancestor routes that lead to the current route.
|
||||
type WalkFunc func(route *Route, router *Router, ancestors []*Route) error
|
||||
|
||||
func (r *Router) walk(walkFn WalkFunc, ancestors []*Route) error {
|
||||
for _, t := range r.routes {
|
||||
err := walkFn(t, r, ancestors)
|
||||
if err == SkipRouter {
|
||||
continue
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for _, sr := range t.matchers {
|
||||
if h, ok := sr.(*Router); ok {
|
||||
ancestors = append(ancestors, t)
|
||||
err := h.walk(walkFn, ancestors)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
ancestors = ancestors[:len(ancestors)-1]
|
||||
}
|
||||
}
|
||||
if h, ok := t.handler.(*Router); ok {
|
||||
ancestors = append(ancestors, t)
|
||||
err := h.walk(walkFn, ancestors)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
ancestors = ancestors[:len(ancestors)-1]
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// Context
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
// RouteMatch stores information about a matched route.
|
||||
type RouteMatch struct {
|
||||
Route *Route
|
||||
Handler http.Handler
|
||||
Vars map[string]string
|
||||
|
||||
// MatchErr is set to appropriate matching error
|
||||
// It is set to ErrMethodMismatch if there is a mismatch in
|
||||
// the request method and route method
|
||||
MatchErr error
|
||||
}
|
||||
|
||||
type contextKey int
|
||||
|
||||
const (
|
||||
varsKey contextKey = iota
|
||||
routeKey
|
||||
)
|
||||
|
||||
// Vars returns the route variables for the current request, if any.
|
||||
func Vars(r *http.Request) map[string]string {
|
||||
if rv := r.Context().Value(varsKey); rv != nil {
|
||||
return rv.(map[string]string)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// CurrentRoute returns the matched route for the current request, if any.
|
||||
// This only works when called inside the handler of the matched route
|
||||
// because the matched route is stored in the request context which is cleared
|
||||
// after the handler returns.
|
||||
func CurrentRoute(r *http.Request) *Route {
|
||||
if rv := r.Context().Value(routeKey); rv != nil {
|
||||
return rv.(*Route)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func requestWithVars(r *http.Request, vars map[string]string) *http.Request {
|
||||
ctx := context.WithValue(r.Context(), varsKey, vars)
|
||||
return r.WithContext(ctx)
|
||||
}
|
||||
|
||||
func requestWithRoute(r *http.Request, route *Route) *http.Request {
|
||||
ctx := context.WithValue(r.Context(), routeKey, route)
|
||||
return r.WithContext(ctx)
|
||||
}
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// Helpers
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
// cleanPath returns the canonical path for p, eliminating . and .. elements.
|
||||
// Borrowed from the net/http package.
|
||||
func cleanPath(p string) string {
|
||||
if p == "" {
|
||||
return "/"
|
||||
}
|
||||
if p[0] != '/' {
|
||||
p = "/" + p
|
||||
}
|
||||
np := path.Clean(p)
|
||||
// path.Clean removes trailing slash except for root;
|
||||
// put the trailing slash back if necessary.
|
||||
if p[len(p)-1] == '/' && np != "/" {
|
||||
np += "/"
|
||||
}
|
||||
|
||||
return np
|
||||
}
|
||||
|
||||
// uniqueVars returns an error if two slices contain duplicated strings.
|
||||
func uniqueVars(s1, s2 []string) error {
|
||||
for _, v1 := range s1 {
|
||||
for _, v2 := range s2 {
|
||||
if v1 == v2 {
|
||||
return fmt.Errorf("mux: duplicated route variable %q", v2)
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// checkPairs returns the count of strings passed in, and an error if
|
||||
// the count is not an even number.
|
||||
func checkPairs(pairs ...string) (int, error) {
|
||||
length := len(pairs)
|
||||
if length%2 != 0 {
|
||||
return length, fmt.Errorf(
|
||||
"mux: number of parameters must be multiple of 2, got %v", pairs)
|
||||
}
|
||||
return length, nil
|
||||
}
|
||||
|
||||
// mapFromPairsToString converts variadic string parameters to a
|
||||
// string to string map.
|
||||
func mapFromPairsToString(pairs ...string) (map[string]string, error) {
|
||||
length, err := checkPairs(pairs...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
m := make(map[string]string, length/2)
|
||||
for i := 0; i < length; i += 2 {
|
||||
m[pairs[i]] = pairs[i+1]
|
||||
}
|
||||
return m, nil
|
||||
}
|
||||
|
||||
// mapFromPairsToRegex converts variadic string parameters to a
|
||||
// string to regex map.
|
||||
func mapFromPairsToRegex(pairs ...string) (map[string]*regexp.Regexp, error) {
|
||||
length, err := checkPairs(pairs...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
m := make(map[string]*regexp.Regexp, length/2)
|
||||
for i := 0; i < length; i += 2 {
|
||||
regex, err := regexp.Compile(pairs[i+1])
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
m[pairs[i]] = regex
|
||||
}
|
||||
return m, nil
|
||||
}
|
||||
|
||||
// matchInArray returns true if the given string value is in the array.
|
||||
func matchInArray(arr []string, value string) bool {
|
||||
for _, v := range arr {
|
||||
if v == value {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// matchMapWithString returns true if the given key/value pairs exist in a given map.
|
||||
func matchMapWithString(toCheck map[string]string, toMatch map[string][]string, canonicalKey bool) bool {
|
||||
for k, v := range toCheck {
|
||||
// Check if key exists.
|
||||
if canonicalKey {
|
||||
k = http.CanonicalHeaderKey(k)
|
||||
}
|
||||
if values := toMatch[k]; values == nil {
|
||||
return false
|
||||
} else if v != "" {
|
||||
// If value was defined as an empty string we only check that the
|
||||
// key exists. Otherwise we also check for equality.
|
||||
valueExists := false
|
||||
for _, value := range values {
|
||||
if v == value {
|
||||
valueExists = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if !valueExists {
|
||||
return false
|
||||
}
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
// matchMapWithRegex returns true if the given key/value pairs exist in a given map compiled against
|
||||
// the given regex
|
||||
func matchMapWithRegex(toCheck map[string]*regexp.Regexp, toMatch map[string][]string, canonicalKey bool) bool {
|
||||
for k, v := range toCheck {
|
||||
// Check if key exists.
|
||||
if canonicalKey {
|
||||
k = http.CanonicalHeaderKey(k)
|
||||
}
|
||||
if values := toMatch[k]; values == nil {
|
||||
return false
|
||||
} else if v != nil {
|
||||
// If value was defined as an empty string we only check that the
|
||||
// key exists. Otherwise we also check for equality.
|
||||
valueExists := false
|
||||
for _, value := range values {
|
||||
if v.MatchString(value) {
|
||||
valueExists = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if !valueExists {
|
||||
return false
|
||||
}
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
// methodNotAllowed replies to the request with an HTTP status code 405.
|
||||
func methodNotAllowed(w http.ResponseWriter, r *http.Request) {
|
||||
w.WriteHeader(http.StatusMethodNotAllowed)
|
||||
}
|
||||
|
||||
// methodNotAllowedHandler returns a simple request handler
|
||||
// that replies to each request with a status code 405.
|
||||
func methodNotAllowedHandler() http.Handler { return http.HandlerFunc(methodNotAllowed) }
|
||||
@ -0,0 +1,388 @@
|
||||
// Copyright 2012 The Gorilla Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package mux
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"regexp"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
type routeRegexpOptions struct {
|
||||
strictSlash bool
|
||||
useEncodedPath bool
|
||||
}
|
||||
|
||||
type regexpType int
|
||||
|
||||
const (
|
||||
regexpTypePath regexpType = 0
|
||||
regexpTypeHost regexpType = 1
|
||||
regexpTypePrefix regexpType = 2
|
||||
regexpTypeQuery regexpType = 3
|
||||
)
|
||||
|
||||
// newRouteRegexp parses a route template and returns a routeRegexp,
|
||||
// used to match a host, a path or a query string.
|
||||
//
|
||||
// It will extract named variables, assemble a regexp to be matched, create
|
||||
// a "reverse" template to build URLs and compile regexps to validate variable
|
||||
// values used in URL building.
|
||||
//
|
||||
// Previously we accepted only Python-like identifiers for variable
|
||||
// names ([a-zA-Z_][a-zA-Z0-9_]*), but currently the only restriction is that
|
||||
// name and pattern can't be empty, and names can't contain a colon.
|
||||
func newRouteRegexp(tpl string, typ regexpType, options routeRegexpOptions) (*routeRegexp, error) {
|
||||
// Check if it is well-formed.
|
||||
idxs, errBraces := braceIndices(tpl)
|
||||
if errBraces != nil {
|
||||
return nil, errBraces
|
||||
}
|
||||
// Backup the original.
|
||||
template := tpl
|
||||
// Now let's parse it.
|
||||
defaultPattern := "[^/]+"
|
||||
if typ == regexpTypeQuery {
|
||||
defaultPattern = ".*"
|
||||
} else if typ == regexpTypeHost {
|
||||
defaultPattern = "[^.]+"
|
||||
}
|
||||
// Only match strict slash if not matching
|
||||
if typ != regexpTypePath {
|
||||
options.strictSlash = false
|
||||
}
|
||||
// Set a flag for strictSlash.
|
||||
endSlash := false
|
||||
if options.strictSlash && strings.HasSuffix(tpl, "/") {
|
||||
tpl = tpl[:len(tpl)-1]
|
||||
endSlash = true
|
||||
}
|
||||
varsN := make([]string, len(idxs)/2)
|
||||
varsR := make([]*regexp.Regexp, len(idxs)/2)
|
||||
pattern := bytes.NewBufferString("")
|
||||
pattern.WriteByte('^')
|
||||
reverse := bytes.NewBufferString("")
|
||||
var end int
|
||||
var err error
|
||||
for i := 0; i < len(idxs); i += 2 {
|
||||
// Set all values we are interested in.
|
||||
raw := tpl[end:idxs[i]]
|
||||
end = idxs[i+1]
|
||||
parts := strings.SplitN(tpl[idxs[i]+1:end-1], ":", 2)
|
||||
name := parts[0]
|
||||
patt := defaultPattern
|
||||
if len(parts) == 2 {
|
||||
patt = parts[1]
|
||||
}
|
||||
// Name or pattern can't be empty.
|
||||
if name == "" || patt == "" {
|
||||
return nil, fmt.Errorf("mux: missing name or pattern in %q",
|
||||
tpl[idxs[i]:end])
|
||||
}
|
||||
// Build the regexp pattern.
|
||||
fmt.Fprintf(pattern, "%s(?P<%s>%s)", regexp.QuoteMeta(raw), varGroupName(i/2), patt)
|
||||
|
||||
// Build the reverse template.
|
||||
fmt.Fprintf(reverse, "%s%%s", raw)
|
||||
|
||||
// Append variable name and compiled pattern.
|
||||
varsN[i/2] = name
|
||||
varsR[i/2], err = regexp.Compile(fmt.Sprintf("^%s$", patt))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
// Add the remaining.
|
||||
raw := tpl[end:]
|
||||
pattern.WriteString(regexp.QuoteMeta(raw))
|
||||
if options.strictSlash {
|
||||
pattern.WriteString("[/]?")
|
||||
}
|
||||
if typ == regexpTypeQuery {
|
||||
// Add the default pattern if the query value is empty
|
||||
if queryVal := strings.SplitN(template, "=", 2)[1]; queryVal == "" {
|
||||
pattern.WriteString(defaultPattern)
|
||||
}
|
||||
}
|
||||
if typ != regexpTypePrefix {
|
||||
pattern.WriteByte('$')
|
||||
}
|
||||
|
||||
var wildcardHostPort bool
|
||||
if typ == regexpTypeHost {
|
||||
if !strings.Contains(pattern.String(), ":") {
|
||||
wildcardHostPort = true
|
||||
}
|
||||
}
|
||||
reverse.WriteString(raw)
|
||||
if endSlash {
|
||||
reverse.WriteByte('/')
|
||||
}
|
||||
// Compile full regexp.
|
||||
reg, errCompile := regexp.Compile(pattern.String())
|
||||
if errCompile != nil {
|
||||
return nil, errCompile
|
||||
}
|
||||
|
||||
// Check for capturing groups which used to work in older versions
|
||||
if reg.NumSubexp() != len(idxs)/2 {
|
||||
panic(fmt.Sprintf("route %s contains capture groups in its regexp. ", template) +
|
||||
"Only non-capturing groups are accepted: e.g. (?:pattern) instead of (pattern)")
|
||||
}
|
||||
|
||||
// Done!
|
||||
return &routeRegexp{
|
||||
template: template,
|
||||
regexpType: typ,
|
||||
options: options,
|
||||
regexp: reg,
|
||||
reverse: reverse.String(),
|
||||
varsN: varsN,
|
||||
varsR: varsR,
|
||||
wildcardHostPort: wildcardHostPort,
|
||||
}, nil
|
||||
}
|
||||
|
||||
// routeRegexp stores a regexp to match a host or path and information to
|
||||
// collect and validate route variables.
|
||||
type routeRegexp struct {
|
||||
// The unmodified template.
|
||||
template string
|
||||
// The type of match
|
||||
regexpType regexpType
|
||||
// Options for matching
|
||||
options routeRegexpOptions
|
||||
// Expanded regexp.
|
||||
regexp *regexp.Regexp
|
||||
// Reverse template.
|
||||
reverse string
|
||||
// Variable names.
|
||||
varsN []string
|
||||
// Variable regexps (validators).
|
||||
varsR []*regexp.Regexp
|
||||
// Wildcard host-port (no strict port match in hostname)
|
||||
wildcardHostPort bool
|
||||
}
|
||||
|
||||
// Match matches the regexp against the URL host or path.
|
||||
func (r *routeRegexp) Match(req *http.Request, match *RouteMatch) bool {
|
||||
if r.regexpType == regexpTypeHost {
|
||||
host := getHost(req)
|
||||
if r.wildcardHostPort {
|
||||
// Don't be strict on the port match
|
||||
if i := strings.Index(host, ":"); i != -1 {
|
||||
host = host[:i]
|
||||
}
|
||||
}
|
||||
return r.regexp.MatchString(host)
|
||||
}
|
||||
|
||||
if r.regexpType == regexpTypeQuery {
|
||||
return r.matchQueryString(req)
|
||||
}
|
||||
path := req.URL.Path
|
||||
if r.options.useEncodedPath {
|
||||
path = req.URL.EscapedPath()
|
||||
}
|
||||
return r.regexp.MatchString(path)
|
||||
}
|
||||
|
||||
// url builds a URL part using the given values.
|
||||
func (r *routeRegexp) url(values map[string]string) (string, error) {
|
||||
urlValues := make([]interface{}, len(r.varsN), len(r.varsN))
|
||||
for k, v := range r.varsN {
|
||||
value, ok := values[v]
|
||||
if !ok {
|
||||
return "", fmt.Errorf("mux: missing route variable %q", v)
|
||||
}
|
||||
if r.regexpType == regexpTypeQuery {
|
||||
value = url.QueryEscape(value)
|
||||
}
|
||||
urlValues[k] = value
|
||||
}
|
||||
rv := fmt.Sprintf(r.reverse, urlValues...)
|
||||
if !r.regexp.MatchString(rv) {
|
||||
// The URL is checked against the full regexp, instead of checking
|
||||
// individual variables. This is faster but to provide a good error
|
||||
// message, we check individual regexps if the URL doesn't match.
|
||||
for k, v := range r.varsN {
|
||||
if !r.varsR[k].MatchString(values[v]) {
|
||||
return "", fmt.Errorf(
|
||||
"mux: variable %q doesn't match, expected %q", values[v],
|
||||
r.varsR[k].String())
|
||||
}
|
||||
}
|
||||
}
|
||||
return rv, nil
|
||||
}
|
||||
|
||||
// getURLQuery returns a single query parameter from a request URL.
|
||||
// For a URL with foo=bar&baz=ding, we return only the relevant key
|
||||
// value pair for the routeRegexp.
|
||||
func (r *routeRegexp) getURLQuery(req *http.Request) string {
|
||||
if r.regexpType != regexpTypeQuery {
|
||||
return ""
|
||||
}
|
||||
templateKey := strings.SplitN(r.template, "=", 2)[0]
|
||||
val, ok := findFirstQueryKey(req.URL.RawQuery, templateKey)
|
||||
if ok {
|
||||
return templateKey + "=" + val
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
// findFirstQueryKey returns the same result as (*url.URL).Query()[key][0].
|
||||
// If key was not found, empty string and false is returned.
|
||||
func findFirstQueryKey(rawQuery, key string) (value string, ok bool) {
|
||||
query := []byte(rawQuery)
|
||||
for len(query) > 0 {
|
||||
foundKey := query
|
||||
if i := bytes.IndexAny(foundKey, "&;"); i >= 0 {
|
||||
foundKey, query = foundKey[:i], foundKey[i+1:]
|
||||
} else {
|
||||
query = query[:0]
|
||||
}
|
||||
if len(foundKey) == 0 {
|
||||
continue
|
||||
}
|
||||
var value []byte
|
||||
if i := bytes.IndexByte(foundKey, '='); i >= 0 {
|
||||
foundKey, value = foundKey[:i], foundKey[i+1:]
|
||||
}
|
||||
if len(foundKey) < len(key) {
|
||||
// Cannot possibly be key.
|
||||
continue
|
||||
}
|
||||
keyString, err := url.QueryUnescape(string(foundKey))
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
if keyString != key {
|
||||
continue
|
||||
}
|
||||
valueString, err := url.QueryUnescape(string(value))
|
||||
if err != nil {
|
||||
continue
|
||||
}
|
||||
return valueString, true
|
||||
}
|
||||
return "", false
|
||||
}
|
||||
|
||||
func (r *routeRegexp) matchQueryString(req *http.Request) bool {
|
||||
return r.regexp.MatchString(r.getURLQuery(req))
|
||||
}
|
||||
|
||||
// braceIndices returns the first level curly brace indices from a string.
|
||||
// It returns an error in case of unbalanced braces.
|
||||
func braceIndices(s string) ([]int, error) {
|
||||
var level, idx int
|
||||
var idxs []int
|
||||
for i := 0; i < len(s); i++ {
|
||||
switch s[i] {
|
||||
case '{':
|
||||
if level++; level == 1 {
|
||||
idx = i
|
||||
}
|
||||
case '}':
|
||||
if level--; level == 0 {
|
||||
idxs = append(idxs, idx, i+1)
|
||||
} else if level < 0 {
|
||||
return nil, fmt.Errorf("mux: unbalanced braces in %q", s)
|
||||
}
|
||||
}
|
||||
}
|
||||
if level != 0 {
|
||||
return nil, fmt.Errorf("mux: unbalanced braces in %q", s)
|
||||
}
|
||||
return idxs, nil
|
||||
}
|
||||
|
||||
// varGroupName builds a capturing group name for the indexed variable.
|
||||
func varGroupName(idx int) string {
|
||||
return "v" + strconv.Itoa(idx)
|
||||
}
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// routeRegexpGroup
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
// routeRegexpGroup groups the route matchers that carry variables.
|
||||
type routeRegexpGroup struct {
|
||||
host *routeRegexp
|
||||
path *routeRegexp
|
||||
queries []*routeRegexp
|
||||
}
|
||||
|
||||
// setMatch extracts the variables from the URL once a route matches.
|
||||
func (v routeRegexpGroup) setMatch(req *http.Request, m *RouteMatch, r *Route) {
|
||||
// Store host variables.
|
||||
if v.host != nil {
|
||||
host := getHost(req)
|
||||
if v.host.wildcardHostPort {
|
||||
// Don't be strict on the port match
|
||||
if i := strings.Index(host, ":"); i != -1 {
|
||||
host = host[:i]
|
||||
}
|
||||
}
|
||||
matches := v.host.regexp.FindStringSubmatchIndex(host)
|
||||
if len(matches) > 0 {
|
||||
extractVars(host, matches, v.host.varsN, m.Vars)
|
||||
}
|
||||
}
|
||||
path := req.URL.Path
|
||||
if r.useEncodedPath {
|
||||
path = req.URL.EscapedPath()
|
||||
}
|
||||
// Store path variables.
|
||||
if v.path != nil {
|
||||
matches := v.path.regexp.FindStringSubmatchIndex(path)
|
||||
if len(matches) > 0 {
|
||||
extractVars(path, matches, v.path.varsN, m.Vars)
|
||||
// Check if we should redirect.
|
||||
if v.path.options.strictSlash {
|
||||
p1 := strings.HasSuffix(path, "/")
|
||||
p2 := strings.HasSuffix(v.path.template, "/")
|
||||
if p1 != p2 {
|
||||
u, _ := url.Parse(req.URL.String())
|
||||
if p1 {
|
||||
u.Path = u.Path[:len(u.Path)-1]
|
||||
} else {
|
||||
u.Path += "/"
|
||||
}
|
||||
m.Handler = http.RedirectHandler(u.String(), http.StatusMovedPermanently)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
// Store query string variables.
|
||||
for _, q := range v.queries {
|
||||
queryURL := q.getURLQuery(req)
|
||||
matches := q.regexp.FindStringSubmatchIndex(queryURL)
|
||||
if len(matches) > 0 {
|
||||
extractVars(queryURL, matches, q.varsN, m.Vars)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// getHost tries its best to return the request host.
|
||||
// According to section 14.23 of RFC 2616 the Host header
|
||||
// can include the port number if the default value of 80 is not used.
|
||||
func getHost(r *http.Request) string {
|
||||
if r.URL.IsAbs() {
|
||||
return r.URL.Host
|
||||
}
|
||||
return r.Host
|
||||
}
|
||||
|
||||
func extractVars(input string, matches []int, names []string, output map[string]string) {
|
||||
for i, name := range names {
|
||||
output[name] = input[matches[2*i+2]:matches[2*i+3]]
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,736 @@
|
||||
// Copyright 2012 The Gorilla Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package mux
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"regexp"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// Route stores information to match a request and build URLs.
|
||||
type Route struct {
|
||||
// Request handler for the route.
|
||||
handler http.Handler
|
||||
// If true, this route never matches: it is only used to build URLs.
|
||||
buildOnly bool
|
||||
// The name used to build URLs.
|
||||
name string
|
||||
// Error resulted from building a route.
|
||||
err error
|
||||
|
||||
// "global" reference to all named routes
|
||||
namedRoutes map[string]*Route
|
||||
|
||||
// config possibly passed in from `Router`
|
||||
routeConf
|
||||
}
|
||||
|
||||
// SkipClean reports whether path cleaning is enabled for this route via
|
||||
// Router.SkipClean.
|
||||
func (r *Route) SkipClean() bool {
|
||||
return r.skipClean
|
||||
}
|
||||
|
||||
// Match matches the route against the request.
|
||||
func (r *Route) Match(req *http.Request, match *RouteMatch) bool {
|
||||
if r.buildOnly || r.err != nil {
|
||||
return false
|
||||
}
|
||||
|
||||
var matchErr error
|
||||
|
||||
// Match everything.
|
||||
for _, m := range r.matchers {
|
||||
if matched := m.Match(req, match); !matched {
|
||||
if _, ok := m.(methodMatcher); ok {
|
||||
matchErr = ErrMethodMismatch
|
||||
continue
|
||||
}
|
||||
|
||||
// Ignore ErrNotFound errors. These errors arise from match call
|
||||
// to Subrouters.
|
||||
//
|
||||
// This prevents subsequent matching subrouters from failing to
|
||||
// run middleware. If not ignored, the middleware would see a
|
||||
// non-nil MatchErr and be skipped, even when there was a
|
||||
// matching route.
|
||||
if match.MatchErr == ErrNotFound {
|
||||
match.MatchErr = nil
|
||||
}
|
||||
|
||||
matchErr = nil
|
||||
return false
|
||||
}
|
||||
}
|
||||
|
||||
if matchErr != nil {
|
||||
match.MatchErr = matchErr
|
||||
return false
|
||||
}
|
||||
|
||||
if match.MatchErr == ErrMethodMismatch && r.handler != nil {
|
||||
// We found a route which matches request method, clear MatchErr
|
||||
match.MatchErr = nil
|
||||
// Then override the mis-matched handler
|
||||
match.Handler = r.handler
|
||||
}
|
||||
|
||||
// Yay, we have a match. Let's collect some info about it.
|
||||
if match.Route == nil {
|
||||
match.Route = r
|
||||
}
|
||||
if match.Handler == nil {
|
||||
match.Handler = r.handler
|
||||
}
|
||||
if match.Vars == nil {
|
||||
match.Vars = make(map[string]string)
|
||||
}
|
||||
|
||||
// Set variables.
|
||||
r.regexp.setMatch(req, match, r)
|
||||
return true
|
||||
}
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// Route attributes
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
// GetError returns an error resulted from building the route, if any.
|
||||
func (r *Route) GetError() error {
|
||||
return r.err
|
||||
}
|
||||
|
||||
// BuildOnly sets the route to never match: it is only used to build URLs.
|
||||
func (r *Route) BuildOnly() *Route {
|
||||
r.buildOnly = true
|
||||
return r
|
||||
}
|
||||
|
||||
// Handler --------------------------------------------------------------------
|
||||
|
||||
// Handler sets a handler for the route.
|
||||
func (r *Route) Handler(handler http.Handler) *Route {
|
||||
if r.err == nil {
|
||||
r.handler = handler
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
// HandlerFunc sets a handler function for the route.
|
||||
func (r *Route) HandlerFunc(f func(http.ResponseWriter, *http.Request)) *Route {
|
||||
return r.Handler(http.HandlerFunc(f))
|
||||
}
|
||||
|
||||
// GetHandler returns the handler for the route, if any.
|
||||
func (r *Route) GetHandler() http.Handler {
|
||||
return r.handler
|
||||
}
|
||||
|
||||
// Name -----------------------------------------------------------------------
|
||||
|
||||
// Name sets the name for the route, used to build URLs.
|
||||
// It is an error to call Name more than once on a route.
|
||||
func (r *Route) Name(name string) *Route {
|
||||
if r.name != "" {
|
||||
r.err = fmt.Errorf("mux: route already has name %q, can't set %q",
|
||||
r.name, name)
|
||||
}
|
||||
if r.err == nil {
|
||||
r.name = name
|
||||
r.namedRoutes[name] = r
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
// GetName returns the name for the route, if any.
|
||||
func (r *Route) GetName() string {
|
||||
return r.name
|
||||
}
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// Matchers
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
// matcher types try to match a request.
|
||||
type matcher interface {
|
||||
Match(*http.Request, *RouteMatch) bool
|
||||
}
|
||||
|
||||
// addMatcher adds a matcher to the route.
|
||||
func (r *Route) addMatcher(m matcher) *Route {
|
||||
if r.err == nil {
|
||||
r.matchers = append(r.matchers, m)
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
// addRegexpMatcher adds a host or path matcher and builder to a route.
|
||||
func (r *Route) addRegexpMatcher(tpl string, typ regexpType) error {
|
||||
if r.err != nil {
|
||||
return r.err
|
||||
}
|
||||
if typ == regexpTypePath || typ == regexpTypePrefix {
|
||||
if len(tpl) > 0 && tpl[0] != '/' {
|
||||
return fmt.Errorf("mux: path must start with a slash, got %q", tpl)
|
||||
}
|
||||
if r.regexp.path != nil {
|
||||
tpl = strings.TrimRight(r.regexp.path.template, "/") + tpl
|
||||
}
|
||||
}
|
||||
rr, err := newRouteRegexp(tpl, typ, routeRegexpOptions{
|
||||
strictSlash: r.strictSlash,
|
||||
useEncodedPath: r.useEncodedPath,
|
||||
})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for _, q := range r.regexp.queries {
|
||||
if err = uniqueVars(rr.varsN, q.varsN); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
if typ == regexpTypeHost {
|
||||
if r.regexp.path != nil {
|
||||
if err = uniqueVars(rr.varsN, r.regexp.path.varsN); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
r.regexp.host = rr
|
||||
} else {
|
||||
if r.regexp.host != nil {
|
||||
if err = uniqueVars(rr.varsN, r.regexp.host.varsN); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
if typ == regexpTypeQuery {
|
||||
r.regexp.queries = append(r.regexp.queries, rr)
|
||||
} else {
|
||||
r.regexp.path = rr
|
||||
}
|
||||
}
|
||||
r.addMatcher(rr)
|
||||
return nil
|
||||
}
|
||||
|
||||
// Headers --------------------------------------------------------------------
|
||||
|
||||
// headerMatcher matches the request against header values.
|
||||
type headerMatcher map[string]string
|
||||
|
||||
func (m headerMatcher) Match(r *http.Request, match *RouteMatch) bool {
|
||||
return matchMapWithString(m, r.Header, true)
|
||||
}
|
||||
|
||||
// Headers adds a matcher for request header values.
|
||||
// It accepts a sequence of key/value pairs to be matched. For example:
|
||||
//
|
||||
// r := mux.NewRouter()
|
||||
// r.Headers("Content-Type", "application/json",
|
||||
// "X-Requested-With", "XMLHttpRequest")
|
||||
//
|
||||
// The above route will only match if both request header values match.
|
||||
// If the value is an empty string, it will match any value if the key is set.
|
||||
func (r *Route) Headers(pairs ...string) *Route {
|
||||
if r.err == nil {
|
||||
var headers map[string]string
|
||||
headers, r.err = mapFromPairsToString(pairs...)
|
||||
return r.addMatcher(headerMatcher(headers))
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
// headerRegexMatcher matches the request against the route given a regex for the header
|
||||
type headerRegexMatcher map[string]*regexp.Regexp
|
||||
|
||||
func (m headerRegexMatcher) Match(r *http.Request, match *RouteMatch) bool {
|
||||
return matchMapWithRegex(m, r.Header, true)
|
||||
}
|
||||
|
||||
// HeadersRegexp accepts a sequence of key/value pairs, where the value has regex
|
||||
// support. For example:
|
||||
//
|
||||
// r := mux.NewRouter()
|
||||
// r.HeadersRegexp("Content-Type", "application/(text|json)",
|
||||
// "X-Requested-With", "XMLHttpRequest")
|
||||
//
|
||||
// The above route will only match if both the request header matches both regular expressions.
|
||||
// If the value is an empty string, it will match any value if the key is set.
|
||||
// Use the start and end of string anchors (^ and $) to match an exact value.
|
||||
func (r *Route) HeadersRegexp(pairs ...string) *Route {
|
||||
if r.err == nil {
|
||||
var headers map[string]*regexp.Regexp
|
||||
headers, r.err = mapFromPairsToRegex(pairs...)
|
||||
return r.addMatcher(headerRegexMatcher(headers))
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
// Host -----------------------------------------------------------------------
|
||||
|
||||
// Host adds a matcher for the URL host.
|
||||
// It accepts a template with zero or more URL variables enclosed by {}.
|
||||
// Variables can define an optional regexp pattern to be matched:
|
||||
//
|
||||
// - {name} matches anything until the next dot.
|
||||
//
|
||||
// - {name:pattern} matches the given regexp pattern.
|
||||
//
|
||||
// For example:
|
||||
//
|
||||
// r := mux.NewRouter()
|
||||
// r.Host("www.example.com")
|
||||
// r.Host("{subdomain}.domain.com")
|
||||
// r.Host("{subdomain:[a-z]+}.domain.com")
|
||||
//
|
||||
// Variable names must be unique in a given route. They can be retrieved
|
||||
// calling mux.Vars(request).
|
||||
func (r *Route) Host(tpl string) *Route {
|
||||
r.err = r.addRegexpMatcher(tpl, regexpTypeHost)
|
||||
return r
|
||||
}
|
||||
|
||||
// MatcherFunc ----------------------------------------------------------------
|
||||
|
||||
// MatcherFunc is the function signature used by custom matchers.
|
||||
type MatcherFunc func(*http.Request, *RouteMatch) bool
|
||||
|
||||
// Match returns the match for a given request.
|
||||
func (m MatcherFunc) Match(r *http.Request, match *RouteMatch) bool {
|
||||
return m(r, match)
|
||||
}
|
||||
|
||||
// MatcherFunc adds a custom function to be used as request matcher.
|
||||
func (r *Route) MatcherFunc(f MatcherFunc) *Route {
|
||||
return r.addMatcher(f)
|
||||
}
|
||||
|
||||
// Methods --------------------------------------------------------------------
|
||||
|
||||
// methodMatcher matches the request against HTTP methods.
|
||||
type methodMatcher []string
|
||||
|
||||
func (m methodMatcher) Match(r *http.Request, match *RouteMatch) bool {
|
||||
return matchInArray(m, r.Method)
|
||||
}
|
||||
|
||||
// Methods adds a matcher for HTTP methods.
|
||||
// It accepts a sequence of one or more methods to be matched, e.g.:
|
||||
// "GET", "POST", "PUT".
|
||||
func (r *Route) Methods(methods ...string) *Route {
|
||||
for k, v := range methods {
|
||||
methods[k] = strings.ToUpper(v)
|
||||
}
|
||||
return r.addMatcher(methodMatcher(methods))
|
||||
}
|
||||
|
||||
// Path -----------------------------------------------------------------------
|
||||
|
||||
// Path adds a matcher for the URL path.
|
||||
// It accepts a template with zero or more URL variables enclosed by {}. The
|
||||
// template must start with a "/".
|
||||
// Variables can define an optional regexp pattern to be matched:
|
||||
//
|
||||
// - {name} matches anything until the next slash.
|
||||
//
|
||||
// - {name:pattern} matches the given regexp pattern.
|
||||
//
|
||||
// For example:
|
||||
//
|
||||
// r := mux.NewRouter()
|
||||
// r.Path("/products/").Handler(ProductsHandler)
|
||||
// r.Path("/products/{key}").Handler(ProductsHandler)
|
||||
// r.Path("/articles/{category}/{id:[0-9]+}").
|
||||
// Handler(ArticleHandler)
|
||||
//
|
||||
// Variable names must be unique in a given route. They can be retrieved
|
||||
// calling mux.Vars(request).
|
||||
func (r *Route) Path(tpl string) *Route {
|
||||
r.err = r.addRegexpMatcher(tpl, regexpTypePath)
|
||||
return r
|
||||
}
|
||||
|
||||
// PathPrefix -----------------------------------------------------------------
|
||||
|
||||
// PathPrefix adds a matcher for the URL path prefix. This matches if the given
|
||||
// template is a prefix of the full URL path. See Route.Path() for details on
|
||||
// the tpl argument.
|
||||
//
|
||||
// Note that it does not treat slashes specially ("/foobar/" will be matched by
|
||||
// the prefix "/foo") so you may want to use a trailing slash here.
|
||||
//
|
||||
// Also note that the setting of Router.StrictSlash() has no effect on routes
|
||||
// with a PathPrefix matcher.
|
||||
func (r *Route) PathPrefix(tpl string) *Route {
|
||||
r.err = r.addRegexpMatcher(tpl, regexpTypePrefix)
|
||||
return r
|
||||
}
|
||||
|
||||
// Query ----------------------------------------------------------------------
|
||||
|
||||
// Queries adds a matcher for URL query values.
|
||||
// It accepts a sequence of key/value pairs. Values may define variables.
|
||||
// For example:
|
||||
//
|
||||
// r := mux.NewRouter()
|
||||
// r.Queries("foo", "bar", "id", "{id:[0-9]+}")
|
||||
//
|
||||
// The above route will only match if the URL contains the defined queries
|
||||
// values, e.g.: ?foo=bar&id=42.
|
||||
//
|
||||
// If the value is an empty string, it will match any value if the key is set.
|
||||
//
|
||||
// Variables can define an optional regexp pattern to be matched:
|
||||
//
|
||||
// - {name} matches anything until the next slash.
|
||||
//
|
||||
// - {name:pattern} matches the given regexp pattern.
|
||||
func (r *Route) Queries(pairs ...string) *Route {
|
||||
length := len(pairs)
|
||||
if length%2 != 0 {
|
||||
r.err = fmt.Errorf(
|
||||
"mux: number of parameters must be multiple of 2, got %v", pairs)
|
||||
return nil
|
||||
}
|
||||
for i := 0; i < length; i += 2 {
|
||||
if r.err = r.addRegexpMatcher(pairs[i]+"="+pairs[i+1], regexpTypeQuery); r.err != nil {
|
||||
return r
|
||||
}
|
||||
}
|
||||
|
||||
return r
|
||||
}
|
||||
|
||||
// Schemes --------------------------------------------------------------------
|
||||
|
||||
// schemeMatcher matches the request against URL schemes.
|
||||
type schemeMatcher []string
|
||||
|
||||
func (m schemeMatcher) Match(r *http.Request, match *RouteMatch) bool {
|
||||
scheme := r.URL.Scheme
|
||||
// https://golang.org/pkg/net/http/#Request
|
||||
// "For [most] server requests, fields other than Path and RawQuery will be
|
||||
// empty."
|
||||
// Since we're an http muxer, the scheme is either going to be http or https
|
||||
// though, so we can just set it based on the tls termination state.
|
||||
if scheme == "" {
|
||||
if r.TLS == nil {
|
||||
scheme = "http"
|
||||
} else {
|
||||
scheme = "https"
|
||||
}
|
||||
}
|
||||
return matchInArray(m, scheme)
|
||||
}
|
||||
|
||||
// Schemes adds a matcher for URL schemes.
|
||||
// It accepts a sequence of schemes to be matched, e.g.: "http", "https".
|
||||
// If the request's URL has a scheme set, it will be matched against.
|
||||
// Generally, the URL scheme will only be set if a previous handler set it,
|
||||
// such as the ProxyHeaders handler from gorilla/handlers.
|
||||
// If unset, the scheme will be determined based on the request's TLS
|
||||
// termination state.
|
||||
// The first argument to Schemes will be used when constructing a route URL.
|
||||
func (r *Route) Schemes(schemes ...string) *Route {
|
||||
for k, v := range schemes {
|
||||
schemes[k] = strings.ToLower(v)
|
||||
}
|
||||
if len(schemes) > 0 {
|
||||
r.buildScheme = schemes[0]
|
||||
}
|
||||
return r.addMatcher(schemeMatcher(schemes))
|
||||
}
|
||||
|
||||
// BuildVarsFunc --------------------------------------------------------------
|
||||
|
||||
// BuildVarsFunc is the function signature used by custom build variable
|
||||
// functions (which can modify route variables before a route's URL is built).
|
||||
type BuildVarsFunc func(map[string]string) map[string]string
|
||||
|
||||
// BuildVarsFunc adds a custom function to be used to modify build variables
|
||||
// before a route's URL is built.
|
||||
func (r *Route) BuildVarsFunc(f BuildVarsFunc) *Route {
|
||||
if r.buildVarsFunc != nil {
|
||||
// compose the old and new functions
|
||||
old := r.buildVarsFunc
|
||||
r.buildVarsFunc = func(m map[string]string) map[string]string {
|
||||
return f(old(m))
|
||||
}
|
||||
} else {
|
||||
r.buildVarsFunc = f
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
// Subrouter ------------------------------------------------------------------
|
||||
|
||||
// Subrouter creates a subrouter for the route.
|
||||
//
|
||||
// It will test the inner routes only if the parent route matched. For example:
|
||||
//
|
||||
// r := mux.NewRouter()
|
||||
// s := r.Host("www.example.com").Subrouter()
|
||||
// s.HandleFunc("/products/", ProductsHandler)
|
||||
// s.HandleFunc("/products/{key}", ProductHandler)
|
||||
// s.HandleFunc("/articles/{category}/{id:[0-9]+}"), ArticleHandler)
|
||||
//
|
||||
// Here, the routes registered in the subrouter won't be tested if the host
|
||||
// doesn't match.
|
||||
func (r *Route) Subrouter() *Router {
|
||||
// initialize a subrouter with a copy of the parent route's configuration
|
||||
router := &Router{routeConf: copyRouteConf(r.routeConf), namedRoutes: r.namedRoutes}
|
||||
r.addMatcher(router)
|
||||
return router
|
||||
}
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// URL building
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
// URL builds a URL for the route.
|
||||
//
|
||||
// It accepts a sequence of key/value pairs for the route variables. For
|
||||
// example, given this route:
|
||||
//
|
||||
// r := mux.NewRouter()
|
||||
// r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
|
||||
// Name("article")
|
||||
//
|
||||
// ...a URL for it can be built using:
|
||||
//
|
||||
// url, err := r.Get("article").URL("category", "technology", "id", "42")
|
||||
//
|
||||
// ...which will return an url.URL with the following path:
|
||||
//
|
||||
// "/articles/technology/42"
|
||||
//
|
||||
// This also works for host variables:
|
||||
//
|
||||
// r := mux.NewRouter()
|
||||
// r.HandleFunc("/articles/{category}/{id:[0-9]+}", ArticleHandler).
|
||||
// Host("{subdomain}.domain.com").
|
||||
// Name("article")
|
||||
//
|
||||
// // url.String() will be "http://news.domain.com/articles/technology/42"
|
||||
// url, err := r.Get("article").URL("subdomain", "news",
|
||||
// "category", "technology",
|
||||
// "id", "42")
|
||||
//
|
||||
// The scheme of the resulting url will be the first argument that was passed to Schemes:
|
||||
//
|
||||
// // url.String() will be "https://example.com"
|
||||
// r := mux.NewRouter()
|
||||
// url, err := r.Host("example.com")
|
||||
// .Schemes("https", "http").URL()
|
||||
//
|
||||
// All variables defined in the route are required, and their values must
|
||||
// conform to the corresponding patterns.
|
||||
func (r *Route) URL(pairs ...string) (*url.URL, error) {
|
||||
if r.err != nil {
|
||||
return nil, r.err
|
||||
}
|
||||
values, err := r.prepareVars(pairs...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
var scheme, host, path string
|
||||
queries := make([]string, 0, len(r.regexp.queries))
|
||||
if r.regexp.host != nil {
|
||||
if host, err = r.regexp.host.url(values); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
scheme = "http"
|
||||
if r.buildScheme != "" {
|
||||
scheme = r.buildScheme
|
||||
}
|
||||
}
|
||||
if r.regexp.path != nil {
|
||||
if path, err = r.regexp.path.url(values); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
for _, q := range r.regexp.queries {
|
||||
var query string
|
||||
if query, err = q.url(values); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
queries = append(queries, query)
|
||||
}
|
||||
return &url.URL{
|
||||
Scheme: scheme,
|
||||
Host: host,
|
||||
Path: path,
|
||||
RawQuery: strings.Join(queries, "&"),
|
||||
}, nil
|
||||
}
|
||||
|
||||
// URLHost builds the host part of the URL for a route. See Route.URL().
|
||||
//
|
||||
// The route must have a host defined.
|
||||
func (r *Route) URLHost(pairs ...string) (*url.URL, error) {
|
||||
if r.err != nil {
|
||||
return nil, r.err
|
||||
}
|
||||
if r.regexp.host == nil {
|
||||
return nil, errors.New("mux: route doesn't have a host")
|
||||
}
|
||||
values, err := r.prepareVars(pairs...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
host, err := r.regexp.host.url(values)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
u := &url.URL{
|
||||
Scheme: "http",
|
||||
Host: host,
|
||||
}
|
||||
if r.buildScheme != "" {
|
||||
u.Scheme = r.buildScheme
|
||||
}
|
||||
return u, nil
|
||||
}
|
||||
|
||||
// URLPath builds the path part of the URL for a route. See Route.URL().
|
||||
//
|
||||
// The route must have a path defined.
|
||||
func (r *Route) URLPath(pairs ...string) (*url.URL, error) {
|
||||
if r.err != nil {
|
||||
return nil, r.err
|
||||
}
|
||||
if r.regexp.path == nil {
|
||||
return nil, errors.New("mux: route doesn't have a path")
|
||||
}
|
||||
values, err := r.prepareVars(pairs...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
path, err := r.regexp.path.url(values)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return &url.URL{
|
||||
Path: path,
|
||||
}, nil
|
||||
}
|
||||
|
||||
// GetPathTemplate returns the template used to build the
|
||||
// route match.
|
||||
// This is useful for building simple REST API documentation and for instrumentation
|
||||
// against third-party services.
|
||||
// An error will be returned if the route does not define a path.
|
||||
func (r *Route) GetPathTemplate() (string, error) {
|
||||
if r.err != nil {
|
||||
return "", r.err
|
||||
}
|
||||
if r.regexp.path == nil {
|
||||
return "", errors.New("mux: route doesn't have a path")
|
||||
}
|
||||
return r.regexp.path.template, nil
|
||||
}
|
||||
|
||||
// GetPathRegexp returns the expanded regular expression used to match route path.
|
||||
// This is useful for building simple REST API documentation and for instrumentation
|
||||
// against third-party services.
|
||||
// An error will be returned if the route does not define a path.
|
||||
func (r *Route) GetPathRegexp() (string, error) {
|
||||
if r.err != nil {
|
||||
return "", r.err
|
||||
}
|
||||
if r.regexp.path == nil {
|
||||
return "", errors.New("mux: route does not have a path")
|
||||
}
|
||||
return r.regexp.path.regexp.String(), nil
|
||||
}
|
||||
|
||||
// GetQueriesRegexp returns the expanded regular expressions used to match the
|
||||
// route queries.
|
||||
// This is useful for building simple REST API documentation and for instrumentation
|
||||
// against third-party services.
|
||||
// An error will be returned if the route does not have queries.
|
||||
func (r *Route) GetQueriesRegexp() ([]string, error) {
|
||||
if r.err != nil {
|
||||
return nil, r.err
|
||||
}
|
||||
if r.regexp.queries == nil {
|
||||
return nil, errors.New("mux: route doesn't have queries")
|
||||
}
|
||||
queries := make([]string, 0, len(r.regexp.queries))
|
||||
for _, query := range r.regexp.queries {
|
||||
queries = append(queries, query.regexp.String())
|
||||
}
|
||||
return queries, nil
|
||||
}
|
||||
|
||||
// GetQueriesTemplates returns the templates used to build the
|
||||
// query matching.
|
||||
// This is useful for building simple REST API documentation and for instrumentation
|
||||
// against third-party services.
|
||||
// An error will be returned if the route does not define queries.
|
||||
func (r *Route) GetQueriesTemplates() ([]string, error) {
|
||||
if r.err != nil {
|
||||
return nil, r.err
|
||||
}
|
||||
if r.regexp.queries == nil {
|
||||
return nil, errors.New("mux: route doesn't have queries")
|
||||
}
|
||||
queries := make([]string, 0, len(r.regexp.queries))
|
||||
for _, query := range r.regexp.queries {
|
||||
queries = append(queries, query.template)
|
||||
}
|
||||
return queries, nil
|
||||
}
|
||||
|
||||
// GetMethods returns the methods the route matches against
|
||||
// This is useful for building simple REST API documentation and for instrumentation
|
||||
// against third-party services.
|
||||
// An error will be returned if route does not have methods.
|
||||
func (r *Route) GetMethods() ([]string, error) {
|
||||
if r.err != nil {
|
||||
return nil, r.err
|
||||
}
|
||||
for _, m := range r.matchers {
|
||||
if methods, ok := m.(methodMatcher); ok {
|
||||
return []string(methods), nil
|
||||
}
|
||||
}
|
||||
return nil, errors.New("mux: route doesn't have methods")
|
||||
}
|
||||
|
||||
// GetHostTemplate returns the template used to build the
|
||||
// route match.
|
||||
// This is useful for building simple REST API documentation and for instrumentation
|
||||
// against third-party services.
|
||||
// An error will be returned if the route does not define a host.
|
||||
func (r *Route) GetHostTemplate() (string, error) {
|
||||
if r.err != nil {
|
||||
return "", r.err
|
||||
}
|
||||
if r.regexp.host == nil {
|
||||
return "", errors.New("mux: route doesn't have a host")
|
||||
}
|
||||
return r.regexp.host.template, nil
|
||||
}
|
||||
|
||||
// prepareVars converts the route variable pairs into a map. If the route has a
|
||||
// BuildVarsFunc, it is invoked.
|
||||
func (r *Route) prepareVars(pairs ...string) (map[string]string, error) {
|
||||
m, err := mapFromPairsToString(pairs...)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return r.buildVars(m), nil
|
||||
}
|
||||
|
||||
func (r *Route) buildVars(m map[string]string) map[string]string {
|
||||
if r.buildVarsFunc != nil {
|
||||
m = r.buildVarsFunc(m)
|
||||
}
|
||||
return m
|
||||
}
|
||||
@ -0,0 +1,19 @@
|
||||
// Copyright 2012 The Gorilla Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package mux
|
||||
|
||||
import "net/http"
|
||||
|
||||
// SetURLVars sets the URL variables for the given request, to be accessed via
|
||||
// mux.Vars for testing route behaviour. Arguments are not modified, a shallow
|
||||
// copy is returned.
|
||||
//
|
||||
// This API should only be used for testing purposes; it provides a way to
|
||||
// inject variables into the request context. Alternatively, URL variables
|
||||
// can be set by making a route that captures the required variables,
|
||||
// starting a server and sending the request to that server.
|
||||
func SetURLVars(r *http.Request, val map[string]string) *http.Request {
|
||||
return requestWithVars(r, val)
|
||||
}
|
||||
@ -0,0 +1,25 @@
|
||||
# Compiled Object files, Static and Dynamic libs (Shared Objects)
|
||||
*.o
|
||||
*.a
|
||||
*.so
|
||||
|
||||
# Folders
|
||||
_obj
|
||||
_test
|
||||
|
||||
# Architecture specific extensions/prefixes
|
||||
*.[568vq]
|
||||
[568vq].out
|
||||
|
||||
*.cgo1.go
|
||||
*.cgo2.c
|
||||
_cgo_defun.c
|
||||
_cgo_gotypes.go
|
||||
_cgo_export.*
|
||||
|
||||
_testmain.go
|
||||
|
||||
*.exe
|
||||
|
||||
.idea/
|
||||
*.iml
|
||||
@ -0,0 +1,9 @@
|
||||
# This is the official list of Gorilla WebSocket authors for copyright
|
||||
# purposes.
|
||||
#
|
||||
# Please keep the list sorted.
|
||||
|
||||
Gary Burd <gary@beagledreams.com>
|
||||
Google LLC (https://opensource.google.com/)
|
||||
Joachim Bauch <mail@joachim-bauch.de>
|
||||
|
||||
@ -0,0 +1,22 @@
|
||||
Copyright (c) 2013 The Gorilla WebSocket Authors. All rights reserved.
|
||||
|
||||
Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions are met:
|
||||
|
||||
Redistributions of source code must retain the above copyright notice, this
|
||||
list of conditions and the following disclaimer.
|
||||
|
||||
Redistributions in binary form must reproduce the above copyright notice,
|
||||
this list of conditions and the following disclaimer in the documentation
|
||||
and/or other materials provided with the distribution.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
||||
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
||||
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
@ -0,0 +1,64 @@
|
||||
# Gorilla WebSocket
|
||||
|
||||
[](https://godoc.org/github.com/gorilla/websocket)
|
||||
[](https://circleci.com/gh/gorilla/websocket)
|
||||
|
||||
Gorilla WebSocket is a [Go](http://golang.org/) implementation of the
|
||||
[WebSocket](http://www.rfc-editor.org/rfc/rfc6455.txt) protocol.
|
||||
|
||||
### Documentation
|
||||
|
||||
* [API Reference](https://pkg.go.dev/github.com/gorilla/websocket?tab=doc)
|
||||
* [Chat example](https://github.com/gorilla/websocket/tree/master/examples/chat)
|
||||
* [Command example](https://github.com/gorilla/websocket/tree/master/examples/command)
|
||||
* [Client and server example](https://github.com/gorilla/websocket/tree/master/examples/echo)
|
||||
* [File watch example](https://github.com/gorilla/websocket/tree/master/examples/filewatch)
|
||||
|
||||
### Status
|
||||
|
||||
The Gorilla WebSocket package provides a complete and tested implementation of
|
||||
the [WebSocket](http://www.rfc-editor.org/rfc/rfc6455.txt) protocol. The
|
||||
package API is stable.
|
||||
|
||||
### Installation
|
||||
|
||||
go get github.com/gorilla/websocket
|
||||
|
||||
### Protocol Compliance
|
||||
|
||||
The Gorilla WebSocket package passes the server tests in the [Autobahn Test
|
||||
Suite](https://github.com/crossbario/autobahn-testsuite) using the application in the [examples/autobahn
|
||||
subdirectory](https://github.com/gorilla/websocket/tree/master/examples/autobahn).
|
||||
|
||||
### Gorilla WebSocket compared with other packages
|
||||
|
||||
<table>
|
||||
<tr>
|
||||
<th></th>
|
||||
<th><a href="http://godoc.org/github.com/gorilla/websocket">github.com/gorilla</a></th>
|
||||
<th><a href="http://godoc.org/golang.org/x/net/websocket">golang.org/x/net</a></th>
|
||||
</tr>
|
||||
<tr>
|
||||
<tr><td colspan="3"><a href="http://tools.ietf.org/html/rfc6455">RFC 6455</a> Features</td></tr>
|
||||
<tr><td>Passes <a href="https://github.com/crossbario/autobahn-testsuite">Autobahn Test Suite</a></td><td><a href="https://github.com/gorilla/websocket/tree/master/examples/autobahn">Yes</a></td><td>No</td></tr>
|
||||
<tr><td>Receive <a href="https://tools.ietf.org/html/rfc6455#section-5.4">fragmented</a> message<td>Yes</td><td><a href="https://code.google.com/p/go/issues/detail?id=7632">No</a>, see note 1</td></tr>
|
||||
<tr><td>Send <a href="https://tools.ietf.org/html/rfc6455#section-5.5.1">close</a> message</td><td><a href="http://godoc.org/github.com/gorilla/websocket#hdr-Control_Messages">Yes</a></td><td><a href="https://code.google.com/p/go/issues/detail?id=4588">No</a></td></tr>
|
||||
<tr><td>Send <a href="https://tools.ietf.org/html/rfc6455#section-5.5.2">pings</a> and receive <a href="https://tools.ietf.org/html/rfc6455#section-5.5.3">pongs</a></td><td><a href="http://godoc.org/github.com/gorilla/websocket#hdr-Control_Messages">Yes</a></td><td>No</td></tr>
|
||||
<tr><td>Get the <a href="https://tools.ietf.org/html/rfc6455#section-5.6">type</a> of a received data message</td><td>Yes</td><td>Yes, see note 2</td></tr>
|
||||
<tr><td colspan="3">Other Features</tr></td>
|
||||
<tr><td><a href="https://tools.ietf.org/html/rfc7692">Compression Extensions</a></td><td>Experimental</td><td>No</td></tr>
|
||||
<tr><td>Read message using io.Reader</td><td><a href="http://godoc.org/github.com/gorilla/websocket#Conn.NextReader">Yes</a></td><td>No, see note 3</td></tr>
|
||||
<tr><td>Write message using io.WriteCloser</td><td><a href="http://godoc.org/github.com/gorilla/websocket#Conn.NextWriter">Yes</a></td><td>No, see note 3</td></tr>
|
||||
</table>
|
||||
|
||||
Notes:
|
||||
|
||||
1. Large messages are fragmented in [Chrome's new WebSocket implementation](http://www.ietf.org/mail-archive/web/hybi/current/msg10503.html).
|
||||
2. The application can get the type of a received data message by implementing
|
||||
a [Codec marshal](http://godoc.org/golang.org/x/net/websocket#Codec.Marshal)
|
||||
function.
|
||||
3. The go.net io.Reader and io.Writer operate across WebSocket frame boundaries.
|
||||
Read returns when the input buffer is full or a frame boundary is
|
||||
encountered. Each call to Write sends a single frame message. The Gorilla
|
||||
io.Reader and io.WriteCloser operate on a single WebSocket message.
|
||||
|
||||
@ -0,0 +1,395 @@
|
||||
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"crypto/tls"
|
||||
"errors"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"net"
|
||||
"net/http"
|
||||
"net/http/httptrace"
|
||||
"net/url"
|
||||
"strings"
|
||||
"time"
|
||||
)
|
||||
|
||||
// ErrBadHandshake is returned when the server response to opening handshake is
|
||||
// invalid.
|
||||
var ErrBadHandshake = errors.New("websocket: bad handshake")
|
||||
|
||||
var errInvalidCompression = errors.New("websocket: invalid compression negotiation")
|
||||
|
||||
// NewClient creates a new client connection using the given net connection.
|
||||
// The URL u specifies the host and request URI. Use requestHeader to specify
|
||||
// the origin (Origin), subprotocols (Sec-WebSocket-Protocol) and cookies
|
||||
// (Cookie). Use the response.Header to get the selected subprotocol
|
||||
// (Sec-WebSocket-Protocol) and cookies (Set-Cookie).
|
||||
//
|
||||
// If the WebSocket handshake fails, ErrBadHandshake is returned along with a
|
||||
// non-nil *http.Response so that callers can handle redirects, authentication,
|
||||
// etc.
|
||||
//
|
||||
// Deprecated: Use Dialer instead.
|
||||
func NewClient(netConn net.Conn, u *url.URL, requestHeader http.Header, readBufSize, writeBufSize int) (c *Conn, response *http.Response, err error) {
|
||||
d := Dialer{
|
||||
ReadBufferSize: readBufSize,
|
||||
WriteBufferSize: writeBufSize,
|
||||
NetDial: func(net, addr string) (net.Conn, error) {
|
||||
return netConn, nil
|
||||
},
|
||||
}
|
||||
return d.Dial(u.String(), requestHeader)
|
||||
}
|
||||
|
||||
// A Dialer contains options for connecting to WebSocket server.
|
||||
type Dialer struct {
|
||||
// NetDial specifies the dial function for creating TCP connections. If
|
||||
// NetDial is nil, net.Dial is used.
|
||||
NetDial func(network, addr string) (net.Conn, error)
|
||||
|
||||
// NetDialContext specifies the dial function for creating TCP connections. If
|
||||
// NetDialContext is nil, net.DialContext is used.
|
||||
NetDialContext func(ctx context.Context, network, addr string) (net.Conn, error)
|
||||
|
||||
// Proxy specifies a function to return a proxy for a given
|
||||
// Request. If the function returns a non-nil error, the
|
||||
// request is aborted with the provided error.
|
||||
// If Proxy is nil or returns a nil *URL, no proxy is used.
|
||||
Proxy func(*http.Request) (*url.URL, error)
|
||||
|
||||
// TLSClientConfig specifies the TLS configuration to use with tls.Client.
|
||||
// If nil, the default configuration is used.
|
||||
TLSClientConfig *tls.Config
|
||||
|
||||
// HandshakeTimeout specifies the duration for the handshake to complete.
|
||||
HandshakeTimeout time.Duration
|
||||
|
||||
// ReadBufferSize and WriteBufferSize specify I/O buffer sizes in bytes. If a buffer
|
||||
// size is zero, then a useful default size is used. The I/O buffer sizes
|
||||
// do not limit the size of the messages that can be sent or received.
|
||||
ReadBufferSize, WriteBufferSize int
|
||||
|
||||
// WriteBufferPool is a pool of buffers for write operations. If the value
|
||||
// is not set, then write buffers are allocated to the connection for the
|
||||
// lifetime of the connection.
|
||||
//
|
||||
// A pool is most useful when the application has a modest volume of writes
|
||||
// across a large number of connections.
|
||||
//
|
||||
// Applications should use a single pool for each unique value of
|
||||
// WriteBufferSize.
|
||||
WriteBufferPool BufferPool
|
||||
|
||||
// Subprotocols specifies the client's requested subprotocols.
|
||||
Subprotocols []string
|
||||
|
||||
// EnableCompression specifies if the client should attempt to negotiate
|
||||
// per message compression (RFC 7692). Setting this value to true does not
|
||||
// guarantee that compression will be supported. Currently only "no context
|
||||
// takeover" modes are supported.
|
||||
EnableCompression bool
|
||||
|
||||
// Jar specifies the cookie jar.
|
||||
// If Jar is nil, cookies are not sent in requests and ignored
|
||||
// in responses.
|
||||
Jar http.CookieJar
|
||||
}
|
||||
|
||||
// Dial creates a new client connection by calling DialContext with a background context.
|
||||
func (d *Dialer) Dial(urlStr string, requestHeader http.Header) (*Conn, *http.Response, error) {
|
||||
return d.DialContext(context.Background(), urlStr, requestHeader)
|
||||
}
|
||||
|
||||
var errMalformedURL = errors.New("malformed ws or wss URL")
|
||||
|
||||
func hostPortNoPort(u *url.URL) (hostPort, hostNoPort string) {
|
||||
hostPort = u.Host
|
||||
hostNoPort = u.Host
|
||||
if i := strings.LastIndex(u.Host, ":"); i > strings.LastIndex(u.Host, "]") {
|
||||
hostNoPort = hostNoPort[:i]
|
||||
} else {
|
||||
switch u.Scheme {
|
||||
case "wss":
|
||||
hostPort += ":443"
|
||||
case "https":
|
||||
hostPort += ":443"
|
||||
default:
|
||||
hostPort += ":80"
|
||||
}
|
||||
}
|
||||
return hostPort, hostNoPort
|
||||
}
|
||||
|
||||
// DefaultDialer is a dialer with all fields set to the default values.
|
||||
var DefaultDialer = &Dialer{
|
||||
Proxy: http.ProxyFromEnvironment,
|
||||
HandshakeTimeout: 45 * time.Second,
|
||||
}
|
||||
|
||||
// nilDialer is dialer to use when receiver is nil.
|
||||
var nilDialer = *DefaultDialer
|
||||
|
||||
// DialContext creates a new client connection. Use requestHeader to specify the
|
||||
// origin (Origin), subprotocols (Sec-WebSocket-Protocol) and cookies (Cookie).
|
||||
// Use the response.Header to get the selected subprotocol
|
||||
// (Sec-WebSocket-Protocol) and cookies (Set-Cookie).
|
||||
//
|
||||
// The context will be used in the request and in the Dialer.
|
||||
//
|
||||
// If the WebSocket handshake fails, ErrBadHandshake is returned along with a
|
||||
// non-nil *http.Response so that callers can handle redirects, authentication,
|
||||
// etcetera. The response body may not contain the entire response and does not
|
||||
// need to be closed by the application.
|
||||
func (d *Dialer) DialContext(ctx context.Context, urlStr string, requestHeader http.Header) (*Conn, *http.Response, error) {
|
||||
if d == nil {
|
||||
d = &nilDialer
|
||||
}
|
||||
|
||||
challengeKey, err := generateChallengeKey()
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
u, err := url.Parse(urlStr)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
switch u.Scheme {
|
||||
case "ws":
|
||||
u.Scheme = "http"
|
||||
case "wss":
|
||||
u.Scheme = "https"
|
||||
default:
|
||||
return nil, nil, errMalformedURL
|
||||
}
|
||||
|
||||
if u.User != nil {
|
||||
// User name and password are not allowed in websocket URIs.
|
||||
return nil, nil, errMalformedURL
|
||||
}
|
||||
|
||||
req := &http.Request{
|
||||
Method: "GET",
|
||||
URL: u,
|
||||
Proto: "HTTP/1.1",
|
||||
ProtoMajor: 1,
|
||||
ProtoMinor: 1,
|
||||
Header: make(http.Header),
|
||||
Host: u.Host,
|
||||
}
|
||||
req = req.WithContext(ctx)
|
||||
|
||||
// Set the cookies present in the cookie jar of the dialer
|
||||
if d.Jar != nil {
|
||||
for _, cookie := range d.Jar.Cookies(u) {
|
||||
req.AddCookie(cookie)
|
||||
}
|
||||
}
|
||||
|
||||
// Set the request headers using the capitalization for names and values in
|
||||
// RFC examples. Although the capitalization shouldn't matter, there are
|
||||
// servers that depend on it. The Header.Set method is not used because the
|
||||
// method canonicalizes the header names.
|
||||
req.Header["Upgrade"] = []string{"websocket"}
|
||||
req.Header["Connection"] = []string{"Upgrade"}
|
||||
req.Header["Sec-WebSocket-Key"] = []string{challengeKey}
|
||||
req.Header["Sec-WebSocket-Version"] = []string{"13"}
|
||||
if len(d.Subprotocols) > 0 {
|
||||
req.Header["Sec-WebSocket-Protocol"] = []string{strings.Join(d.Subprotocols, ", ")}
|
||||
}
|
||||
for k, vs := range requestHeader {
|
||||
switch {
|
||||
case k == "Host":
|
||||
if len(vs) > 0 {
|
||||
req.Host = vs[0]
|
||||
}
|
||||
case k == "Upgrade" ||
|
||||
k == "Connection" ||
|
||||
k == "Sec-Websocket-Key" ||
|
||||
k == "Sec-Websocket-Version" ||
|
||||
k == "Sec-Websocket-Extensions" ||
|
||||
(k == "Sec-Websocket-Protocol" && len(d.Subprotocols) > 0):
|
||||
return nil, nil, errors.New("websocket: duplicate header not allowed: " + k)
|
||||
case k == "Sec-Websocket-Protocol":
|
||||
req.Header["Sec-WebSocket-Protocol"] = vs
|
||||
default:
|
||||
req.Header[k] = vs
|
||||
}
|
||||
}
|
||||
|
||||
if d.EnableCompression {
|
||||
req.Header["Sec-WebSocket-Extensions"] = []string{"permessage-deflate; server_no_context_takeover; client_no_context_takeover"}
|
||||
}
|
||||
|
||||
if d.HandshakeTimeout != 0 {
|
||||
var cancel func()
|
||||
ctx, cancel = context.WithTimeout(ctx, d.HandshakeTimeout)
|
||||
defer cancel()
|
||||
}
|
||||
|
||||
// Get network dial function.
|
||||
var netDial func(network, add string) (net.Conn, error)
|
||||
|
||||
if d.NetDialContext != nil {
|
||||
netDial = func(network, addr string) (net.Conn, error) {
|
||||
return d.NetDialContext(ctx, network, addr)
|
||||
}
|
||||
} else if d.NetDial != nil {
|
||||
netDial = d.NetDial
|
||||
} else {
|
||||
netDialer := &net.Dialer{}
|
||||
netDial = func(network, addr string) (net.Conn, error) {
|
||||
return netDialer.DialContext(ctx, network, addr)
|
||||
}
|
||||
}
|
||||
|
||||
// If needed, wrap the dial function to set the connection deadline.
|
||||
if deadline, ok := ctx.Deadline(); ok {
|
||||
forwardDial := netDial
|
||||
netDial = func(network, addr string) (net.Conn, error) {
|
||||
c, err := forwardDial(network, addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
err = c.SetDeadline(deadline)
|
||||
if err != nil {
|
||||
c.Close()
|
||||
return nil, err
|
||||
}
|
||||
return c, nil
|
||||
}
|
||||
}
|
||||
|
||||
// If needed, wrap the dial function to connect through a proxy.
|
||||
if d.Proxy != nil {
|
||||
proxyURL, err := d.Proxy(req)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
if proxyURL != nil {
|
||||
dialer, err := proxy_FromURL(proxyURL, netDialerFunc(netDial))
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
netDial = dialer.Dial
|
||||
}
|
||||
}
|
||||
|
||||
hostPort, hostNoPort := hostPortNoPort(u)
|
||||
trace := httptrace.ContextClientTrace(ctx)
|
||||
if trace != nil && trace.GetConn != nil {
|
||||
trace.GetConn(hostPort)
|
||||
}
|
||||
|
||||
netConn, err := netDial("tcp", hostPort)
|
||||
if trace != nil && trace.GotConn != nil {
|
||||
trace.GotConn(httptrace.GotConnInfo{
|
||||
Conn: netConn,
|
||||
})
|
||||
}
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
defer func() {
|
||||
if netConn != nil {
|
||||
netConn.Close()
|
||||
}
|
||||
}()
|
||||
|
||||
if u.Scheme == "https" {
|
||||
cfg := cloneTLSConfig(d.TLSClientConfig)
|
||||
if cfg.ServerName == "" {
|
||||
cfg.ServerName = hostNoPort
|
||||
}
|
||||
tlsConn := tls.Client(netConn, cfg)
|
||||
netConn = tlsConn
|
||||
|
||||
var err error
|
||||
if trace != nil {
|
||||
err = doHandshakeWithTrace(trace, tlsConn, cfg)
|
||||
} else {
|
||||
err = doHandshake(tlsConn, cfg)
|
||||
}
|
||||
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
}
|
||||
|
||||
conn := newConn(netConn, false, d.ReadBufferSize, d.WriteBufferSize, d.WriteBufferPool, nil, nil)
|
||||
|
||||
if err := req.Write(netConn); err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
if trace != nil && trace.GotFirstResponseByte != nil {
|
||||
if peek, err := conn.br.Peek(1); err == nil && len(peek) == 1 {
|
||||
trace.GotFirstResponseByte()
|
||||
}
|
||||
}
|
||||
|
||||
resp, err := http.ReadResponse(conn.br, req)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
if d.Jar != nil {
|
||||
if rc := resp.Cookies(); len(rc) > 0 {
|
||||
d.Jar.SetCookies(u, rc)
|
||||
}
|
||||
}
|
||||
|
||||
if resp.StatusCode != 101 ||
|
||||
!strings.EqualFold(resp.Header.Get("Upgrade"), "websocket") ||
|
||||
!strings.EqualFold(resp.Header.Get("Connection"), "upgrade") ||
|
||||
resp.Header.Get("Sec-Websocket-Accept") != computeAcceptKey(challengeKey) {
|
||||
// Before closing the network connection on return from this
|
||||
// function, slurp up some of the response to aid application
|
||||
// debugging.
|
||||
buf := make([]byte, 1024)
|
||||
n, _ := io.ReadFull(resp.Body, buf)
|
||||
resp.Body = ioutil.NopCloser(bytes.NewReader(buf[:n]))
|
||||
return nil, resp, ErrBadHandshake
|
||||
}
|
||||
|
||||
for _, ext := range parseExtensions(resp.Header) {
|
||||
if ext[""] != "permessage-deflate" {
|
||||
continue
|
||||
}
|
||||
_, snct := ext["server_no_context_takeover"]
|
||||
_, cnct := ext["client_no_context_takeover"]
|
||||
if !snct || !cnct {
|
||||
return nil, resp, errInvalidCompression
|
||||
}
|
||||
conn.newCompressionWriter = compressNoContextTakeover
|
||||
conn.newDecompressionReader = decompressNoContextTakeover
|
||||
break
|
||||
}
|
||||
|
||||
resp.Body = ioutil.NopCloser(bytes.NewReader([]byte{}))
|
||||
conn.subprotocol = resp.Header.Get("Sec-Websocket-Protocol")
|
||||
|
||||
netConn.SetDeadline(time.Time{})
|
||||
netConn = nil // to avoid close in defer.
|
||||
return conn, resp, nil
|
||||
}
|
||||
|
||||
func doHandshake(tlsConn *tls.Conn, cfg *tls.Config) error {
|
||||
if err := tlsConn.Handshake(); err != nil {
|
||||
return err
|
||||
}
|
||||
if !cfg.InsecureSkipVerify {
|
||||
if err := tlsConn.VerifyHostname(cfg.ServerName); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
@ -0,0 +1,16 @@
|
||||
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build go1.8
|
||||
|
||||
package websocket
|
||||
|
||||
import "crypto/tls"
|
||||
|
||||
func cloneTLSConfig(cfg *tls.Config) *tls.Config {
|
||||
if cfg == nil {
|
||||
return &tls.Config{}
|
||||
}
|
||||
return cfg.Clone()
|
||||
}
|
||||
@ -0,0 +1,38 @@
|
||||
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !go1.8
|
||||
|
||||
package websocket
|
||||
|
||||
import "crypto/tls"
|
||||
|
||||
// cloneTLSConfig clones all public fields except the fields
|
||||
// SessionTicketsDisabled and SessionTicketKey. This avoids copying the
|
||||
// sync.Mutex in the sync.Once and makes it safe to call cloneTLSConfig on a
|
||||
// config in active use.
|
||||
func cloneTLSConfig(cfg *tls.Config) *tls.Config {
|
||||
if cfg == nil {
|
||||
return &tls.Config{}
|
||||
}
|
||||
return &tls.Config{
|
||||
Rand: cfg.Rand,
|
||||
Time: cfg.Time,
|
||||
Certificates: cfg.Certificates,
|
||||
NameToCertificate: cfg.NameToCertificate,
|
||||
GetCertificate: cfg.GetCertificate,
|
||||
RootCAs: cfg.RootCAs,
|
||||
NextProtos: cfg.NextProtos,
|
||||
ServerName: cfg.ServerName,
|
||||
ClientAuth: cfg.ClientAuth,
|
||||
ClientCAs: cfg.ClientCAs,
|
||||
InsecureSkipVerify: cfg.InsecureSkipVerify,
|
||||
CipherSuites: cfg.CipherSuites,
|
||||
PreferServerCipherSuites: cfg.PreferServerCipherSuites,
|
||||
ClientSessionCache: cfg.ClientSessionCache,
|
||||
MinVersion: cfg.MinVersion,
|
||||
MaxVersion: cfg.MaxVersion,
|
||||
CurvePreferences: cfg.CurvePreferences,
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,148 @@
|
||||
// Copyright 2017 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"compress/flate"
|
||||
"errors"
|
||||
"io"
|
||||
"strings"
|
||||
"sync"
|
||||
)
|
||||
|
||||
const (
|
||||
minCompressionLevel = -2 // flate.HuffmanOnly not defined in Go < 1.6
|
||||
maxCompressionLevel = flate.BestCompression
|
||||
defaultCompressionLevel = 1
|
||||
)
|
||||
|
||||
var (
|
||||
flateWriterPools [maxCompressionLevel - minCompressionLevel + 1]sync.Pool
|
||||
flateReaderPool = sync.Pool{New: func() interface{} {
|
||||
return flate.NewReader(nil)
|
||||
}}
|
||||
)
|
||||
|
||||
func decompressNoContextTakeover(r io.Reader) io.ReadCloser {
|
||||
const tail =
|
||||
// Add four bytes as specified in RFC
|
||||
"\x00\x00\xff\xff" +
|
||||
// Add final block to squelch unexpected EOF error from flate reader.
|
||||
"\x01\x00\x00\xff\xff"
|
||||
|
||||
fr, _ := flateReaderPool.Get().(io.ReadCloser)
|
||||
fr.(flate.Resetter).Reset(io.MultiReader(r, strings.NewReader(tail)), nil)
|
||||
return &flateReadWrapper{fr}
|
||||
}
|
||||
|
||||
func isValidCompressionLevel(level int) bool {
|
||||
return minCompressionLevel <= level && level <= maxCompressionLevel
|
||||
}
|
||||
|
||||
func compressNoContextTakeover(w io.WriteCloser, level int) io.WriteCloser {
|
||||
p := &flateWriterPools[level-minCompressionLevel]
|
||||
tw := &truncWriter{w: w}
|
||||
fw, _ := p.Get().(*flate.Writer)
|
||||
if fw == nil {
|
||||
fw, _ = flate.NewWriter(tw, level)
|
||||
} else {
|
||||
fw.Reset(tw)
|
||||
}
|
||||
return &flateWriteWrapper{fw: fw, tw: tw, p: p}
|
||||
}
|
||||
|
||||
// truncWriter is an io.Writer that writes all but the last four bytes of the
|
||||
// stream to another io.Writer.
|
||||
type truncWriter struct {
|
||||
w io.WriteCloser
|
||||
n int
|
||||
p [4]byte
|
||||
}
|
||||
|
||||
func (w *truncWriter) Write(p []byte) (int, error) {
|
||||
n := 0
|
||||
|
||||
// fill buffer first for simplicity.
|
||||
if w.n < len(w.p) {
|
||||
n = copy(w.p[w.n:], p)
|
||||
p = p[n:]
|
||||
w.n += n
|
||||
if len(p) == 0 {
|
||||
return n, nil
|
||||
}
|
||||
}
|
||||
|
||||
m := len(p)
|
||||
if m > len(w.p) {
|
||||
m = len(w.p)
|
||||
}
|
||||
|
||||
if nn, err := w.w.Write(w.p[:m]); err != nil {
|
||||
return n + nn, err
|
||||
}
|
||||
|
||||
copy(w.p[:], w.p[m:])
|
||||
copy(w.p[len(w.p)-m:], p[len(p)-m:])
|
||||
nn, err := w.w.Write(p[:len(p)-m])
|
||||
return n + nn, err
|
||||
}
|
||||
|
||||
type flateWriteWrapper struct {
|
||||
fw *flate.Writer
|
||||
tw *truncWriter
|
||||
p *sync.Pool
|
||||
}
|
||||
|
||||
func (w *flateWriteWrapper) Write(p []byte) (int, error) {
|
||||
if w.fw == nil {
|
||||
return 0, errWriteClosed
|
||||
}
|
||||
return w.fw.Write(p)
|
||||
}
|
||||
|
||||
func (w *flateWriteWrapper) Close() error {
|
||||
if w.fw == nil {
|
||||
return errWriteClosed
|
||||
}
|
||||
err1 := w.fw.Flush()
|
||||
w.p.Put(w.fw)
|
||||
w.fw = nil
|
||||
if w.tw.p != [4]byte{0, 0, 0xff, 0xff} {
|
||||
return errors.New("websocket: internal error, unexpected bytes at end of flate stream")
|
||||
}
|
||||
err2 := w.tw.w.Close()
|
||||
if err1 != nil {
|
||||
return err1
|
||||
}
|
||||
return err2
|
||||
}
|
||||
|
||||
type flateReadWrapper struct {
|
||||
fr io.ReadCloser
|
||||
}
|
||||
|
||||
func (r *flateReadWrapper) Read(p []byte) (int, error) {
|
||||
if r.fr == nil {
|
||||
return 0, io.ErrClosedPipe
|
||||
}
|
||||
n, err := r.fr.Read(p)
|
||||
if err == io.EOF {
|
||||
// Preemptively place the reader back in the pool. This helps with
|
||||
// scenarios where the application does not call NextReader() soon after
|
||||
// this final read.
|
||||
r.Close()
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
|
||||
func (r *flateReadWrapper) Close() error {
|
||||
if r.fr == nil {
|
||||
return io.ErrClosedPipe
|
||||
}
|
||||
err := r.fr.Close()
|
||||
flateReaderPool.Put(r.fr)
|
||||
r.fr = nil
|
||||
return err
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,15 @@
|
||||
// Copyright 2016 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build go1.8
|
||||
|
||||
package websocket
|
||||
|
||||
import "net"
|
||||
|
||||
func (c *Conn) writeBufs(bufs ...[]byte) error {
|
||||
b := net.Buffers(bufs)
|
||||
_, err := b.WriteTo(c.conn)
|
||||
return err
|
||||
}
|
||||
@ -0,0 +1,18 @@
|
||||
// Copyright 2016 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !go1.8
|
||||
|
||||
package websocket
|
||||
|
||||
func (c *Conn) writeBufs(bufs ...[]byte) error {
|
||||
for _, buf := range bufs {
|
||||
if len(buf) > 0 {
|
||||
if _, err := c.conn.Write(buf); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
@ -0,0 +1,227 @@
|
||||
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Package websocket implements the WebSocket protocol defined in RFC 6455.
|
||||
//
|
||||
// Overview
|
||||
//
|
||||
// The Conn type represents a WebSocket connection. A server application calls
|
||||
// the Upgrader.Upgrade method from an HTTP request handler to get a *Conn:
|
||||
//
|
||||
// var upgrader = websocket.Upgrader{
|
||||
// ReadBufferSize: 1024,
|
||||
// WriteBufferSize: 1024,
|
||||
// }
|
||||
//
|
||||
// func handler(w http.ResponseWriter, r *http.Request) {
|
||||
// conn, err := upgrader.Upgrade(w, r, nil)
|
||||
// if err != nil {
|
||||
// log.Println(err)
|
||||
// return
|
||||
// }
|
||||
// ... Use conn to send and receive messages.
|
||||
// }
|
||||
//
|
||||
// Call the connection's WriteMessage and ReadMessage methods to send and
|
||||
// receive messages as a slice of bytes. This snippet of code shows how to echo
|
||||
// messages using these methods:
|
||||
//
|
||||
// for {
|
||||
// messageType, p, err := conn.ReadMessage()
|
||||
// if err != nil {
|
||||
// log.Println(err)
|
||||
// return
|
||||
// }
|
||||
// if err := conn.WriteMessage(messageType, p); err != nil {
|
||||
// log.Println(err)
|
||||
// return
|
||||
// }
|
||||
// }
|
||||
//
|
||||
// In above snippet of code, p is a []byte and messageType is an int with value
|
||||
// websocket.BinaryMessage or websocket.TextMessage.
|
||||
//
|
||||
// An application can also send and receive messages using the io.WriteCloser
|
||||
// and io.Reader interfaces. To send a message, call the connection NextWriter
|
||||
// method to get an io.WriteCloser, write the message to the writer and close
|
||||
// the writer when done. To receive a message, call the connection NextReader
|
||||
// method to get an io.Reader and read until io.EOF is returned. This snippet
|
||||
// shows how to echo messages using the NextWriter and NextReader methods:
|
||||
//
|
||||
// for {
|
||||
// messageType, r, err := conn.NextReader()
|
||||
// if err != nil {
|
||||
// return
|
||||
// }
|
||||
// w, err := conn.NextWriter(messageType)
|
||||
// if err != nil {
|
||||
// return err
|
||||
// }
|
||||
// if _, err := io.Copy(w, r); err != nil {
|
||||
// return err
|
||||
// }
|
||||
// if err := w.Close(); err != nil {
|
||||
// return err
|
||||
// }
|
||||
// }
|
||||
//
|
||||
// Data Messages
|
||||
//
|
||||
// The WebSocket protocol distinguishes between text and binary data messages.
|
||||
// Text messages are interpreted as UTF-8 encoded text. The interpretation of
|
||||
// binary messages is left to the application.
|
||||
//
|
||||
// This package uses the TextMessage and BinaryMessage integer constants to
|
||||
// identify the two data message types. The ReadMessage and NextReader methods
|
||||
// return the type of the received message. The messageType argument to the
|
||||
// WriteMessage and NextWriter methods specifies the type of a sent message.
|
||||
//
|
||||
// It is the application's responsibility to ensure that text messages are
|
||||
// valid UTF-8 encoded text.
|
||||
//
|
||||
// Control Messages
|
||||
//
|
||||
// The WebSocket protocol defines three types of control messages: close, ping
|
||||
// and pong. Call the connection WriteControl, WriteMessage or NextWriter
|
||||
// methods to send a control message to the peer.
|
||||
//
|
||||
// Connections handle received close messages by calling the handler function
|
||||
// set with the SetCloseHandler method and by returning a *CloseError from the
|
||||
// NextReader, ReadMessage or the message Read method. The default close
|
||||
// handler sends a close message to the peer.
|
||||
//
|
||||
// Connections handle received ping messages by calling the handler function
|
||||
// set with the SetPingHandler method. The default ping handler sends a pong
|
||||
// message to the peer.
|
||||
//
|
||||
// Connections handle received pong messages by calling the handler function
|
||||
// set with the SetPongHandler method. The default pong handler does nothing.
|
||||
// If an application sends ping messages, then the application should set a
|
||||
// pong handler to receive the corresponding pong.
|
||||
//
|
||||
// The control message handler functions are called from the NextReader,
|
||||
// ReadMessage and message reader Read methods. The default close and ping
|
||||
// handlers can block these methods for a short time when the handler writes to
|
||||
// the connection.
|
||||
//
|
||||
// The application must read the connection to process close, ping and pong
|
||||
// messages sent from the peer. If the application is not otherwise interested
|
||||
// in messages from the peer, then the application should start a goroutine to
|
||||
// read and discard messages from the peer. A simple example is:
|
||||
//
|
||||
// func readLoop(c *websocket.Conn) {
|
||||
// for {
|
||||
// if _, _, err := c.NextReader(); err != nil {
|
||||
// c.Close()
|
||||
// break
|
||||
// }
|
||||
// }
|
||||
// }
|
||||
//
|
||||
// Concurrency
|
||||
//
|
||||
// Connections support one concurrent reader and one concurrent writer.
|
||||
//
|
||||
// Applications are responsible for ensuring that no more than one goroutine
|
||||
// calls the write methods (NextWriter, SetWriteDeadline, WriteMessage,
|
||||
// WriteJSON, EnableWriteCompression, SetCompressionLevel) concurrently and
|
||||
// that no more than one goroutine calls the read methods (NextReader,
|
||||
// SetReadDeadline, ReadMessage, ReadJSON, SetPongHandler, SetPingHandler)
|
||||
// concurrently.
|
||||
//
|
||||
// The Close and WriteControl methods can be called concurrently with all other
|
||||
// methods.
|
||||
//
|
||||
// Origin Considerations
|
||||
//
|
||||
// Web browsers allow Javascript applications to open a WebSocket connection to
|
||||
// any host. It's up to the server to enforce an origin policy using the Origin
|
||||
// request header sent by the browser.
|
||||
//
|
||||
// The Upgrader calls the function specified in the CheckOrigin field to check
|
||||
// the origin. If the CheckOrigin function returns false, then the Upgrade
|
||||
// method fails the WebSocket handshake with HTTP status 403.
|
||||
//
|
||||
// If the CheckOrigin field is nil, then the Upgrader uses a safe default: fail
|
||||
// the handshake if the Origin request header is present and the Origin host is
|
||||
// not equal to the Host request header.
|
||||
//
|
||||
// The deprecated package-level Upgrade function does not perform origin
|
||||
// checking. The application is responsible for checking the Origin header
|
||||
// before calling the Upgrade function.
|
||||
//
|
||||
// Buffers
|
||||
//
|
||||
// Connections buffer network input and output to reduce the number
|
||||
// of system calls when reading or writing messages.
|
||||
//
|
||||
// Write buffers are also used for constructing WebSocket frames. See RFC 6455,
|
||||
// Section 5 for a discussion of message framing. A WebSocket frame header is
|
||||
// written to the network each time a write buffer is flushed to the network.
|
||||
// Decreasing the size of the write buffer can increase the amount of framing
|
||||
// overhead on the connection.
|
||||
//
|
||||
// The buffer sizes in bytes are specified by the ReadBufferSize and
|
||||
// WriteBufferSize fields in the Dialer and Upgrader. The Dialer uses a default
|
||||
// size of 4096 when a buffer size field is set to zero. The Upgrader reuses
|
||||
// buffers created by the HTTP server when a buffer size field is set to zero.
|
||||
// The HTTP server buffers have a size of 4096 at the time of this writing.
|
||||
//
|
||||
// The buffer sizes do not limit the size of a message that can be read or
|
||||
// written by a connection.
|
||||
//
|
||||
// Buffers are held for the lifetime of the connection by default. If the
|
||||
// Dialer or Upgrader WriteBufferPool field is set, then a connection holds the
|
||||
// write buffer only when writing a message.
|
||||
//
|
||||
// Applications should tune the buffer sizes to balance memory use and
|
||||
// performance. Increasing the buffer size uses more memory, but can reduce the
|
||||
// number of system calls to read or write the network. In the case of writing,
|
||||
// increasing the buffer size can reduce the number of frame headers written to
|
||||
// the network.
|
||||
//
|
||||
// Some guidelines for setting buffer parameters are:
|
||||
//
|
||||
// Limit the buffer sizes to the maximum expected message size. Buffers larger
|
||||
// than the largest message do not provide any benefit.
|
||||
//
|
||||
// Depending on the distribution of message sizes, setting the buffer size to
|
||||
// a value less than the maximum expected message size can greatly reduce memory
|
||||
// use with a small impact on performance. Here's an example: If 99% of the
|
||||
// messages are smaller than 256 bytes and the maximum message size is 512
|
||||
// bytes, then a buffer size of 256 bytes will result in 1.01 more system calls
|
||||
// than a buffer size of 512 bytes. The memory savings is 50%.
|
||||
//
|
||||
// A write buffer pool is useful when the application has a modest number
|
||||
// writes over a large number of connections. when buffers are pooled, a larger
|
||||
// buffer size has a reduced impact on total memory use and has the benefit of
|
||||
// reducing system calls and frame overhead.
|
||||
//
|
||||
// Compression EXPERIMENTAL
|
||||
//
|
||||
// Per message compression extensions (RFC 7692) are experimentally supported
|
||||
// by this package in a limited capacity. Setting the EnableCompression option
|
||||
// to true in Dialer or Upgrader will attempt to negotiate per message deflate
|
||||
// support.
|
||||
//
|
||||
// var upgrader = websocket.Upgrader{
|
||||
// EnableCompression: true,
|
||||
// }
|
||||
//
|
||||
// If compression was successfully negotiated with the connection's peer, any
|
||||
// message received in compressed form will be automatically decompressed.
|
||||
// All Read methods will return uncompressed bytes.
|
||||
//
|
||||
// Per message compression of messages written to a connection can be enabled
|
||||
// or disabled by calling the corresponding Conn method:
|
||||
//
|
||||
// conn.EnableWriteCompression(false)
|
||||
//
|
||||
// Currently this package does not support compression with "context takeover".
|
||||
// This means that messages must be compressed and decompressed in isolation,
|
||||
// without retaining sliding window or dictionary state across messages. For
|
||||
// more details refer to RFC 7692.
|
||||
//
|
||||
// Use of compression is experimental and may result in decreased performance.
|
||||
package websocket
|
||||
@ -0,0 +1,3 @@
|
||||
module github.com/gorilla/websocket
|
||||
|
||||
go 1.12
|
||||
@ -0,0 +1,42 @@
|
||||
// Copyright 2019 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"io"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// JoinMessages concatenates received messages to create a single io.Reader.
|
||||
// The string term is appended to each message. The returned reader does not
|
||||
// support concurrent calls to the Read method.
|
||||
func JoinMessages(c *Conn, term string) io.Reader {
|
||||
return &joinReader{c: c, term: term}
|
||||
}
|
||||
|
||||
type joinReader struct {
|
||||
c *Conn
|
||||
term string
|
||||
r io.Reader
|
||||
}
|
||||
|
||||
func (r *joinReader) Read(p []byte) (int, error) {
|
||||
if r.r == nil {
|
||||
var err error
|
||||
_, r.r, err = r.c.NextReader()
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
if r.term != "" {
|
||||
r.r = io.MultiReader(r.r, strings.NewReader(r.term))
|
||||
}
|
||||
}
|
||||
n, err := r.r.Read(p)
|
||||
if err == io.EOF {
|
||||
err = nil
|
||||
r.r = nil
|
||||
}
|
||||
return n, err
|
||||
}
|
||||
@ -0,0 +1,60 @@
|
||||
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"encoding/json"
|
||||
"io"
|
||||
)
|
||||
|
||||
// WriteJSON writes the JSON encoding of v as a message.
|
||||
//
|
||||
// Deprecated: Use c.WriteJSON instead.
|
||||
func WriteJSON(c *Conn, v interface{}) error {
|
||||
return c.WriteJSON(v)
|
||||
}
|
||||
|
||||
// WriteJSON writes the JSON encoding of v as a message.
|
||||
//
|
||||
// See the documentation for encoding/json Marshal for details about the
|
||||
// conversion of Go values to JSON.
|
||||
func (c *Conn) WriteJSON(v interface{}) error {
|
||||
w, err := c.NextWriter(TextMessage)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
err1 := json.NewEncoder(w).Encode(v)
|
||||
err2 := w.Close()
|
||||
if err1 != nil {
|
||||
return err1
|
||||
}
|
||||
return err2
|
||||
}
|
||||
|
||||
// ReadJSON reads the next JSON-encoded message from the connection and stores
|
||||
// it in the value pointed to by v.
|
||||
//
|
||||
// Deprecated: Use c.ReadJSON instead.
|
||||
func ReadJSON(c *Conn, v interface{}) error {
|
||||
return c.ReadJSON(v)
|
||||
}
|
||||
|
||||
// ReadJSON reads the next JSON-encoded message from the connection and stores
|
||||
// it in the value pointed to by v.
|
||||
//
|
||||
// See the documentation for the encoding/json Unmarshal function for details
|
||||
// about the conversion of JSON to a Go value.
|
||||
func (c *Conn) ReadJSON(v interface{}) error {
|
||||
_, r, err := c.NextReader()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
err = json.NewDecoder(r).Decode(v)
|
||||
if err == io.EOF {
|
||||
// One value is expected in the message.
|
||||
err = io.ErrUnexpectedEOF
|
||||
}
|
||||
return err
|
||||
}
|
||||
@ -0,0 +1,54 @@
|
||||
// Copyright 2016 The Gorilla WebSocket Authors. All rights reserved. Use of
|
||||
// this source code is governed by a BSD-style license that can be found in the
|
||||
// LICENSE file.
|
||||
|
||||
// +build !appengine
|
||||
|
||||
package websocket
|
||||
|
||||
import "unsafe"
|
||||
|
||||
const wordSize = int(unsafe.Sizeof(uintptr(0)))
|
||||
|
||||
func maskBytes(key [4]byte, pos int, b []byte) int {
|
||||
// Mask one byte at a time for small buffers.
|
||||
if len(b) < 2*wordSize {
|
||||
for i := range b {
|
||||
b[i] ^= key[pos&3]
|
||||
pos++
|
||||
}
|
||||
return pos & 3
|
||||
}
|
||||
|
||||
// Mask one byte at a time to word boundary.
|
||||
if n := int(uintptr(unsafe.Pointer(&b[0]))) % wordSize; n != 0 {
|
||||
n = wordSize - n
|
||||
for i := range b[:n] {
|
||||
b[i] ^= key[pos&3]
|
||||
pos++
|
||||
}
|
||||
b = b[n:]
|
||||
}
|
||||
|
||||
// Create aligned word size key.
|
||||
var k [wordSize]byte
|
||||
for i := range k {
|
||||
k[i] = key[(pos+i)&3]
|
||||
}
|
||||
kw := *(*uintptr)(unsafe.Pointer(&k))
|
||||
|
||||
// Mask one word at a time.
|
||||
n := (len(b) / wordSize) * wordSize
|
||||
for i := 0; i < n; i += wordSize {
|
||||
*(*uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&b[0])) + uintptr(i))) ^= kw
|
||||
}
|
||||
|
||||
// Mask one byte at a time for remaining bytes.
|
||||
b = b[n:]
|
||||
for i := range b {
|
||||
b[i] ^= key[pos&3]
|
||||
pos++
|
||||
}
|
||||
|
||||
return pos & 3
|
||||
}
|
||||
@ -0,0 +1,15 @@
|
||||
// Copyright 2016 The Gorilla WebSocket Authors. All rights reserved. Use of
|
||||
// this source code is governed by a BSD-style license that can be found in the
|
||||
// LICENSE file.
|
||||
|
||||
// +build appengine
|
||||
|
||||
package websocket
|
||||
|
||||
func maskBytes(key [4]byte, pos int, b []byte) int {
|
||||
for i := range b {
|
||||
b[i] ^= key[pos&3]
|
||||
pos++
|
||||
}
|
||||
return pos & 3
|
||||
}
|
||||
@ -0,0 +1,102 @@
|
||||
// Copyright 2017 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"net"
|
||||
"sync"
|
||||
"time"
|
||||
)
|
||||
|
||||
// PreparedMessage caches on the wire representations of a message payload.
|
||||
// Use PreparedMessage to efficiently send a message payload to multiple
|
||||
// connections. PreparedMessage is especially useful when compression is used
|
||||
// because the CPU and memory expensive compression operation can be executed
|
||||
// once for a given set of compression options.
|
||||
type PreparedMessage struct {
|
||||
messageType int
|
||||
data []byte
|
||||
mu sync.Mutex
|
||||
frames map[prepareKey]*preparedFrame
|
||||
}
|
||||
|
||||
// prepareKey defines a unique set of options to cache prepared frames in PreparedMessage.
|
||||
type prepareKey struct {
|
||||
isServer bool
|
||||
compress bool
|
||||
compressionLevel int
|
||||
}
|
||||
|
||||
// preparedFrame contains data in wire representation.
|
||||
type preparedFrame struct {
|
||||
once sync.Once
|
||||
data []byte
|
||||
}
|
||||
|
||||
// NewPreparedMessage returns an initialized PreparedMessage. You can then send
|
||||
// it to connection using WritePreparedMessage method. Valid wire
|
||||
// representation will be calculated lazily only once for a set of current
|
||||
// connection options.
|
||||
func NewPreparedMessage(messageType int, data []byte) (*PreparedMessage, error) {
|
||||
pm := &PreparedMessage{
|
||||
messageType: messageType,
|
||||
frames: make(map[prepareKey]*preparedFrame),
|
||||
data: data,
|
||||
}
|
||||
|
||||
// Prepare a plain server frame.
|
||||
_, frameData, err := pm.frame(prepareKey{isServer: true, compress: false})
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// To protect against caller modifying the data argument, remember the data
|
||||
// copied to the plain server frame.
|
||||
pm.data = frameData[len(frameData)-len(data):]
|
||||
return pm, nil
|
||||
}
|
||||
|
||||
func (pm *PreparedMessage) frame(key prepareKey) (int, []byte, error) {
|
||||
pm.mu.Lock()
|
||||
frame, ok := pm.frames[key]
|
||||
if !ok {
|
||||
frame = &preparedFrame{}
|
||||
pm.frames[key] = frame
|
||||
}
|
||||
pm.mu.Unlock()
|
||||
|
||||
var err error
|
||||
frame.once.Do(func() {
|
||||
// Prepare a frame using a 'fake' connection.
|
||||
// TODO: Refactor code in conn.go to allow more direct construction of
|
||||
// the frame.
|
||||
mu := make(chan struct{}, 1)
|
||||
mu <- struct{}{}
|
||||
var nc prepareConn
|
||||
c := &Conn{
|
||||
conn: &nc,
|
||||
mu: mu,
|
||||
isServer: key.isServer,
|
||||
compressionLevel: key.compressionLevel,
|
||||
enableWriteCompression: true,
|
||||
writeBuf: make([]byte, defaultWriteBufferSize+maxFrameHeaderSize),
|
||||
}
|
||||
if key.compress {
|
||||
c.newCompressionWriter = compressNoContextTakeover
|
||||
}
|
||||
err = c.WriteMessage(pm.messageType, pm.data)
|
||||
frame.data = nc.buf.Bytes()
|
||||
})
|
||||
return pm.messageType, frame.data, err
|
||||
}
|
||||
|
||||
type prepareConn struct {
|
||||
buf bytes.Buffer
|
||||
net.Conn
|
||||
}
|
||||
|
||||
func (pc *prepareConn) Write(p []byte) (int, error) { return pc.buf.Write(p) }
|
||||
func (pc *prepareConn) SetWriteDeadline(t time.Time) error { return nil }
|
||||
@ -0,0 +1,77 @@
|
||||
// Copyright 2017 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"encoding/base64"
|
||||
"errors"
|
||||
"net"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"strings"
|
||||
)
|
||||
|
||||
type netDialerFunc func(network, addr string) (net.Conn, error)
|
||||
|
||||
func (fn netDialerFunc) Dial(network, addr string) (net.Conn, error) {
|
||||
return fn(network, addr)
|
||||
}
|
||||
|
||||
func init() {
|
||||
proxy_RegisterDialerType("http", func(proxyURL *url.URL, forwardDialer proxy_Dialer) (proxy_Dialer, error) {
|
||||
return &httpProxyDialer{proxyURL: proxyURL, forwardDial: forwardDialer.Dial}, nil
|
||||
})
|
||||
}
|
||||
|
||||
type httpProxyDialer struct {
|
||||
proxyURL *url.URL
|
||||
forwardDial func(network, addr string) (net.Conn, error)
|
||||
}
|
||||
|
||||
func (hpd *httpProxyDialer) Dial(network string, addr string) (net.Conn, error) {
|
||||
hostPort, _ := hostPortNoPort(hpd.proxyURL)
|
||||
conn, err := hpd.forwardDial(network, hostPort)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
connectHeader := make(http.Header)
|
||||
if user := hpd.proxyURL.User; user != nil {
|
||||
proxyUser := user.Username()
|
||||
if proxyPassword, passwordSet := user.Password(); passwordSet {
|
||||
credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword))
|
||||
connectHeader.Set("Proxy-Authorization", "Basic "+credential)
|
||||
}
|
||||
}
|
||||
|
||||
connectReq := &http.Request{
|
||||
Method: "CONNECT",
|
||||
URL: &url.URL{Opaque: addr},
|
||||
Host: addr,
|
||||
Header: connectHeader,
|
||||
}
|
||||
|
||||
if err := connectReq.Write(conn); err != nil {
|
||||
conn.Close()
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Read response. It's OK to use and discard buffered reader here becaue
|
||||
// the remote server does not speak until spoken to.
|
||||
br := bufio.NewReader(conn)
|
||||
resp, err := http.ReadResponse(br, connectReq)
|
||||
if err != nil {
|
||||
conn.Close()
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if resp.StatusCode != 200 {
|
||||
conn.Close()
|
||||
f := strings.SplitN(resp.Status, " ", 2)
|
||||
return nil, errors.New(f[1])
|
||||
}
|
||||
return conn, nil
|
||||
}
|
||||
@ -0,0 +1,363 @@
|
||||
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"errors"
|
||||
"io"
|
||||
"net/http"
|
||||
"net/url"
|
||||
"strings"
|
||||
"time"
|
||||
)
|
||||
|
||||
// HandshakeError describes an error with the handshake from the peer.
|
||||
type HandshakeError struct {
|
||||
message string
|
||||
}
|
||||
|
||||
func (e HandshakeError) Error() string { return e.message }
|
||||
|
||||
// Upgrader specifies parameters for upgrading an HTTP connection to a
|
||||
// WebSocket connection.
|
||||
type Upgrader struct {
|
||||
// HandshakeTimeout specifies the duration for the handshake to complete.
|
||||
HandshakeTimeout time.Duration
|
||||
|
||||
// ReadBufferSize and WriteBufferSize specify I/O buffer sizes in bytes. If a buffer
|
||||
// size is zero, then buffers allocated by the HTTP server are used. The
|
||||
// I/O buffer sizes do not limit the size of the messages that can be sent
|
||||
// or received.
|
||||
ReadBufferSize, WriteBufferSize int
|
||||
|
||||
// WriteBufferPool is a pool of buffers for write operations. If the value
|
||||
// is not set, then write buffers are allocated to the connection for the
|
||||
// lifetime of the connection.
|
||||
//
|
||||
// A pool is most useful when the application has a modest volume of writes
|
||||
// across a large number of connections.
|
||||
//
|
||||
// Applications should use a single pool for each unique value of
|
||||
// WriteBufferSize.
|
||||
WriteBufferPool BufferPool
|
||||
|
||||
// Subprotocols specifies the server's supported protocols in order of
|
||||
// preference. If this field is not nil, then the Upgrade method negotiates a
|
||||
// subprotocol by selecting the first match in this list with a protocol
|
||||
// requested by the client. If there's no match, then no protocol is
|
||||
// negotiated (the Sec-Websocket-Protocol header is not included in the
|
||||
// handshake response).
|
||||
Subprotocols []string
|
||||
|
||||
// Error specifies the function for generating HTTP error responses. If Error
|
||||
// is nil, then http.Error is used to generate the HTTP response.
|
||||
Error func(w http.ResponseWriter, r *http.Request, status int, reason error)
|
||||
|
||||
// CheckOrigin returns true if the request Origin header is acceptable. If
|
||||
// CheckOrigin is nil, then a safe default is used: return false if the
|
||||
// Origin request header is present and the origin host is not equal to
|
||||
// request Host header.
|
||||
//
|
||||
// A CheckOrigin function should carefully validate the request origin to
|
||||
// prevent cross-site request forgery.
|
||||
CheckOrigin func(r *http.Request) bool
|
||||
|
||||
// EnableCompression specify if the server should attempt to negotiate per
|
||||
// message compression (RFC 7692). Setting this value to true does not
|
||||
// guarantee that compression will be supported. Currently only "no context
|
||||
// takeover" modes are supported.
|
||||
EnableCompression bool
|
||||
}
|
||||
|
||||
func (u *Upgrader) returnError(w http.ResponseWriter, r *http.Request, status int, reason string) (*Conn, error) {
|
||||
err := HandshakeError{reason}
|
||||
if u.Error != nil {
|
||||
u.Error(w, r, status, err)
|
||||
} else {
|
||||
w.Header().Set("Sec-Websocket-Version", "13")
|
||||
http.Error(w, http.StatusText(status), status)
|
||||
}
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// checkSameOrigin returns true if the origin is not set or is equal to the request host.
|
||||
func checkSameOrigin(r *http.Request) bool {
|
||||
origin := r.Header["Origin"]
|
||||
if len(origin) == 0 {
|
||||
return true
|
||||
}
|
||||
u, err := url.Parse(origin[0])
|
||||
if err != nil {
|
||||
return false
|
||||
}
|
||||
return equalASCIIFold(u.Host, r.Host)
|
||||
}
|
||||
|
||||
func (u *Upgrader) selectSubprotocol(r *http.Request, responseHeader http.Header) string {
|
||||
if u.Subprotocols != nil {
|
||||
clientProtocols := Subprotocols(r)
|
||||
for _, serverProtocol := range u.Subprotocols {
|
||||
for _, clientProtocol := range clientProtocols {
|
||||
if clientProtocol == serverProtocol {
|
||||
return clientProtocol
|
||||
}
|
||||
}
|
||||
}
|
||||
} else if responseHeader != nil {
|
||||
return responseHeader.Get("Sec-Websocket-Protocol")
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
// Upgrade upgrades the HTTP server connection to the WebSocket protocol.
|
||||
//
|
||||
// The responseHeader is included in the response to the client's upgrade
|
||||
// request. Use the responseHeader to specify cookies (Set-Cookie) and the
|
||||
// application negotiated subprotocol (Sec-WebSocket-Protocol).
|
||||
//
|
||||
// If the upgrade fails, then Upgrade replies to the client with an HTTP error
|
||||
// response.
|
||||
func (u *Upgrader) Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header) (*Conn, error) {
|
||||
const badHandshake = "websocket: the client is not using the websocket protocol: "
|
||||
|
||||
if !tokenListContainsValue(r.Header, "Connection", "upgrade") {
|
||||
return u.returnError(w, r, http.StatusBadRequest, badHandshake+"'upgrade' token not found in 'Connection' header")
|
||||
}
|
||||
|
||||
if !tokenListContainsValue(r.Header, "Upgrade", "websocket") {
|
||||
return u.returnError(w, r, http.StatusBadRequest, badHandshake+"'websocket' token not found in 'Upgrade' header")
|
||||
}
|
||||
|
||||
if r.Method != "GET" {
|
||||
return u.returnError(w, r, http.StatusMethodNotAllowed, badHandshake+"request method is not GET")
|
||||
}
|
||||
|
||||
if !tokenListContainsValue(r.Header, "Sec-Websocket-Version", "13") {
|
||||
return u.returnError(w, r, http.StatusBadRequest, "websocket: unsupported version: 13 not found in 'Sec-Websocket-Version' header")
|
||||
}
|
||||
|
||||
if _, ok := responseHeader["Sec-Websocket-Extensions"]; ok {
|
||||
return u.returnError(w, r, http.StatusInternalServerError, "websocket: application specific 'Sec-WebSocket-Extensions' headers are unsupported")
|
||||
}
|
||||
|
||||
checkOrigin := u.CheckOrigin
|
||||
if checkOrigin == nil {
|
||||
checkOrigin = checkSameOrigin
|
||||
}
|
||||
if !checkOrigin(r) {
|
||||
return u.returnError(w, r, http.StatusForbidden, "websocket: request origin not allowed by Upgrader.CheckOrigin")
|
||||
}
|
||||
|
||||
challengeKey := r.Header.Get("Sec-Websocket-Key")
|
||||
if challengeKey == "" {
|
||||
return u.returnError(w, r, http.StatusBadRequest, "websocket: not a websocket handshake: 'Sec-WebSocket-Key' header is missing or blank")
|
||||
}
|
||||
|
||||
subprotocol := u.selectSubprotocol(r, responseHeader)
|
||||
|
||||
// Negotiate PMCE
|
||||
var compress bool
|
||||
if u.EnableCompression {
|
||||
for _, ext := range parseExtensions(r.Header) {
|
||||
if ext[""] != "permessage-deflate" {
|
||||
continue
|
||||
}
|
||||
compress = true
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
h, ok := w.(http.Hijacker)
|
||||
if !ok {
|
||||
return u.returnError(w, r, http.StatusInternalServerError, "websocket: response does not implement http.Hijacker")
|
||||
}
|
||||
var brw *bufio.ReadWriter
|
||||
netConn, brw, err := h.Hijack()
|
||||
if err != nil {
|
||||
return u.returnError(w, r, http.StatusInternalServerError, err.Error())
|
||||
}
|
||||
|
||||
if brw.Reader.Buffered() > 0 {
|
||||
netConn.Close()
|
||||
return nil, errors.New("websocket: client sent data before handshake is complete")
|
||||
}
|
||||
|
||||
var br *bufio.Reader
|
||||
if u.ReadBufferSize == 0 && bufioReaderSize(netConn, brw.Reader) > 256 {
|
||||
// Reuse hijacked buffered reader as connection reader.
|
||||
br = brw.Reader
|
||||
}
|
||||
|
||||
buf := bufioWriterBuffer(netConn, brw.Writer)
|
||||
|
||||
var writeBuf []byte
|
||||
if u.WriteBufferPool == nil && u.WriteBufferSize == 0 && len(buf) >= maxFrameHeaderSize+256 {
|
||||
// Reuse hijacked write buffer as connection buffer.
|
||||
writeBuf = buf
|
||||
}
|
||||
|
||||
c := newConn(netConn, true, u.ReadBufferSize, u.WriteBufferSize, u.WriteBufferPool, br, writeBuf)
|
||||
c.subprotocol = subprotocol
|
||||
|
||||
if compress {
|
||||
c.newCompressionWriter = compressNoContextTakeover
|
||||
c.newDecompressionReader = decompressNoContextTakeover
|
||||
}
|
||||
|
||||
// Use larger of hijacked buffer and connection write buffer for header.
|
||||
p := buf
|
||||
if len(c.writeBuf) > len(p) {
|
||||
p = c.writeBuf
|
||||
}
|
||||
p = p[:0]
|
||||
|
||||
p = append(p, "HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: "...)
|
||||
p = append(p, computeAcceptKey(challengeKey)...)
|
||||
p = append(p, "\r\n"...)
|
||||
if c.subprotocol != "" {
|
||||
p = append(p, "Sec-WebSocket-Protocol: "...)
|
||||
p = append(p, c.subprotocol...)
|
||||
p = append(p, "\r\n"...)
|
||||
}
|
||||
if compress {
|
||||
p = append(p, "Sec-WebSocket-Extensions: permessage-deflate; server_no_context_takeover; client_no_context_takeover\r\n"...)
|
||||
}
|
||||
for k, vs := range responseHeader {
|
||||
if k == "Sec-Websocket-Protocol" {
|
||||
continue
|
||||
}
|
||||
for _, v := range vs {
|
||||
p = append(p, k...)
|
||||
p = append(p, ": "...)
|
||||
for i := 0; i < len(v); i++ {
|
||||
b := v[i]
|
||||
if b <= 31 {
|
||||
// prevent response splitting.
|
||||
b = ' '
|
||||
}
|
||||
p = append(p, b)
|
||||
}
|
||||
p = append(p, "\r\n"...)
|
||||
}
|
||||
}
|
||||
p = append(p, "\r\n"...)
|
||||
|
||||
// Clear deadlines set by HTTP server.
|
||||
netConn.SetDeadline(time.Time{})
|
||||
|
||||
if u.HandshakeTimeout > 0 {
|
||||
netConn.SetWriteDeadline(time.Now().Add(u.HandshakeTimeout))
|
||||
}
|
||||
if _, err = netConn.Write(p); err != nil {
|
||||
netConn.Close()
|
||||
return nil, err
|
||||
}
|
||||
if u.HandshakeTimeout > 0 {
|
||||
netConn.SetWriteDeadline(time.Time{})
|
||||
}
|
||||
|
||||
return c, nil
|
||||
}
|
||||
|
||||
// Upgrade upgrades the HTTP server connection to the WebSocket protocol.
|
||||
//
|
||||
// Deprecated: Use websocket.Upgrader instead.
|
||||
//
|
||||
// Upgrade does not perform origin checking. The application is responsible for
|
||||
// checking the Origin header before calling Upgrade. An example implementation
|
||||
// of the same origin policy check is:
|
||||
//
|
||||
// if req.Header.Get("Origin") != "http://"+req.Host {
|
||||
// http.Error(w, "Origin not allowed", http.StatusForbidden)
|
||||
// return
|
||||
// }
|
||||
//
|
||||
// If the endpoint supports subprotocols, then the application is responsible
|
||||
// for negotiating the protocol used on the connection. Use the Subprotocols()
|
||||
// function to get the subprotocols requested by the client. Use the
|
||||
// Sec-Websocket-Protocol response header to specify the subprotocol selected
|
||||
// by the application.
|
||||
//
|
||||
// The responseHeader is included in the response to the client's upgrade
|
||||
// request. Use the responseHeader to specify cookies (Set-Cookie) and the
|
||||
// negotiated subprotocol (Sec-Websocket-Protocol).
|
||||
//
|
||||
// The connection buffers IO to the underlying network connection. The
|
||||
// readBufSize and writeBufSize parameters specify the size of the buffers to
|
||||
// use. Messages can be larger than the buffers.
|
||||
//
|
||||
// If the request is not a valid WebSocket handshake, then Upgrade returns an
|
||||
// error of type HandshakeError. Applications should handle this error by
|
||||
// replying to the client with an HTTP error response.
|
||||
func Upgrade(w http.ResponseWriter, r *http.Request, responseHeader http.Header, readBufSize, writeBufSize int) (*Conn, error) {
|
||||
u := Upgrader{ReadBufferSize: readBufSize, WriteBufferSize: writeBufSize}
|
||||
u.Error = func(w http.ResponseWriter, r *http.Request, status int, reason error) {
|
||||
// don't return errors to maintain backwards compatibility
|
||||
}
|
||||
u.CheckOrigin = func(r *http.Request) bool {
|
||||
// allow all connections by default
|
||||
return true
|
||||
}
|
||||
return u.Upgrade(w, r, responseHeader)
|
||||
}
|
||||
|
||||
// Subprotocols returns the subprotocols requested by the client in the
|
||||
// Sec-Websocket-Protocol header.
|
||||
func Subprotocols(r *http.Request) []string {
|
||||
h := strings.TrimSpace(r.Header.Get("Sec-Websocket-Protocol"))
|
||||
if h == "" {
|
||||
return nil
|
||||
}
|
||||
protocols := strings.Split(h, ",")
|
||||
for i := range protocols {
|
||||
protocols[i] = strings.TrimSpace(protocols[i])
|
||||
}
|
||||
return protocols
|
||||
}
|
||||
|
||||
// IsWebSocketUpgrade returns true if the client requested upgrade to the
|
||||
// WebSocket protocol.
|
||||
func IsWebSocketUpgrade(r *http.Request) bool {
|
||||
return tokenListContainsValue(r.Header, "Connection", "upgrade") &&
|
||||
tokenListContainsValue(r.Header, "Upgrade", "websocket")
|
||||
}
|
||||
|
||||
// bufioReaderSize size returns the size of a bufio.Reader.
|
||||
func bufioReaderSize(originalReader io.Reader, br *bufio.Reader) int {
|
||||
// This code assumes that peek on a reset reader returns
|
||||
// bufio.Reader.buf[:0].
|
||||
// TODO: Use bufio.Reader.Size() after Go 1.10
|
||||
br.Reset(originalReader)
|
||||
if p, err := br.Peek(0); err == nil {
|
||||
return cap(p)
|
||||
}
|
||||
return 0
|
||||
}
|
||||
|
||||
// writeHook is an io.Writer that records the last slice passed to it vio
|
||||
// io.Writer.Write.
|
||||
type writeHook struct {
|
||||
p []byte
|
||||
}
|
||||
|
||||
func (wh *writeHook) Write(p []byte) (int, error) {
|
||||
wh.p = p
|
||||
return len(p), nil
|
||||
}
|
||||
|
||||
// bufioWriterBuffer grabs the buffer from a bufio.Writer.
|
||||
func bufioWriterBuffer(originalWriter io.Writer, bw *bufio.Writer) []byte {
|
||||
// This code assumes that bufio.Writer.buf[:1] is passed to the
|
||||
// bufio.Writer's underlying writer.
|
||||
var wh writeHook
|
||||
bw.Reset(&wh)
|
||||
bw.WriteByte(0)
|
||||
bw.Flush()
|
||||
|
||||
bw.Reset(originalWriter)
|
||||
|
||||
return wh.p[:cap(wh.p)]
|
||||
}
|
||||
@ -0,0 +1,19 @@
|
||||
// +build go1.8
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"crypto/tls"
|
||||
"net/http/httptrace"
|
||||
)
|
||||
|
||||
func doHandshakeWithTrace(trace *httptrace.ClientTrace, tlsConn *tls.Conn, cfg *tls.Config) error {
|
||||
if trace.TLSHandshakeStart != nil {
|
||||
trace.TLSHandshakeStart()
|
||||
}
|
||||
err := doHandshake(tlsConn, cfg)
|
||||
if trace.TLSHandshakeDone != nil {
|
||||
trace.TLSHandshakeDone(tlsConn.ConnectionState(), err)
|
||||
}
|
||||
return err
|
||||
}
|
||||
@ -0,0 +1,12 @@
|
||||
// +build !go1.8
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"crypto/tls"
|
||||
"net/http/httptrace"
|
||||
)
|
||||
|
||||
func doHandshakeWithTrace(trace *httptrace.ClientTrace, tlsConn *tls.Conn, cfg *tls.Config) error {
|
||||
return doHandshake(tlsConn, cfg)
|
||||
}
|
||||
@ -0,0 +1,283 @@
|
||||
// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"crypto/rand"
|
||||
"crypto/sha1"
|
||||
"encoding/base64"
|
||||
"io"
|
||||
"net/http"
|
||||
"strings"
|
||||
"unicode/utf8"
|
||||
)
|
||||
|
||||
var keyGUID = []byte("258EAFA5-E914-47DA-95CA-C5AB0DC85B11")
|
||||
|
||||
func computeAcceptKey(challengeKey string) string {
|
||||
h := sha1.New()
|
||||
h.Write([]byte(challengeKey))
|
||||
h.Write(keyGUID)
|
||||
return base64.StdEncoding.EncodeToString(h.Sum(nil))
|
||||
}
|
||||
|
||||
func generateChallengeKey() (string, error) {
|
||||
p := make([]byte, 16)
|
||||
if _, err := io.ReadFull(rand.Reader, p); err != nil {
|
||||
return "", err
|
||||
}
|
||||
return base64.StdEncoding.EncodeToString(p), nil
|
||||
}
|
||||
|
||||
// Token octets per RFC 2616.
|
||||
var isTokenOctet = [256]bool{
|
||||
'!': true,
|
||||
'#': true,
|
||||
'$': true,
|
||||
'%': true,
|
||||
'&': true,
|
||||
'\'': true,
|
||||
'*': true,
|
||||
'+': true,
|
||||
'-': true,
|
||||
'.': true,
|
||||
'0': true,
|
||||
'1': true,
|
||||
'2': true,
|
||||
'3': true,
|
||||
'4': true,
|
||||
'5': true,
|
||||
'6': true,
|
||||
'7': true,
|
||||
'8': true,
|
||||
'9': true,
|
||||
'A': true,
|
||||
'B': true,
|
||||
'C': true,
|
||||
'D': true,
|
||||
'E': true,
|
||||
'F': true,
|
||||
'G': true,
|
||||
'H': true,
|
||||
'I': true,
|
||||
'J': true,
|
||||
'K': true,
|
||||
'L': true,
|
||||
'M': true,
|
||||
'N': true,
|
||||
'O': true,
|
||||
'P': true,
|
||||
'Q': true,
|
||||
'R': true,
|
||||
'S': true,
|
||||
'T': true,
|
||||
'U': true,
|
||||
'W': true,
|
||||
'V': true,
|
||||
'X': true,
|
||||
'Y': true,
|
||||
'Z': true,
|
||||
'^': true,
|
||||
'_': true,
|
||||
'`': true,
|
||||
'a': true,
|
||||
'b': true,
|
||||
'c': true,
|
||||
'd': true,
|
||||
'e': true,
|
||||
'f': true,
|
||||
'g': true,
|
||||
'h': true,
|
||||
'i': true,
|
||||
'j': true,
|
||||
'k': true,
|
||||
'l': true,
|
||||
'm': true,
|
||||
'n': true,
|
||||
'o': true,
|
||||
'p': true,
|
||||
'q': true,
|
||||
'r': true,
|
||||
's': true,
|
||||
't': true,
|
||||
'u': true,
|
||||
'v': true,
|
||||
'w': true,
|
||||
'x': true,
|
||||
'y': true,
|
||||
'z': true,
|
||||
'|': true,
|
||||
'~': true,
|
||||
}
|
||||
|
||||
// skipSpace returns a slice of the string s with all leading RFC 2616 linear
|
||||
// whitespace removed.
|
||||
func skipSpace(s string) (rest string) {
|
||||
i := 0
|
||||
for ; i < len(s); i++ {
|
||||
if b := s[i]; b != ' ' && b != '\t' {
|
||||
break
|
||||
}
|
||||
}
|
||||
return s[i:]
|
||||
}
|
||||
|
||||
// nextToken returns the leading RFC 2616 token of s and the string following
|
||||
// the token.
|
||||
func nextToken(s string) (token, rest string) {
|
||||
i := 0
|
||||
for ; i < len(s); i++ {
|
||||
if !isTokenOctet[s[i]] {
|
||||
break
|
||||
}
|
||||
}
|
||||
return s[:i], s[i:]
|
||||
}
|
||||
|
||||
// nextTokenOrQuoted returns the leading token or quoted string per RFC 2616
|
||||
// and the string following the token or quoted string.
|
||||
func nextTokenOrQuoted(s string) (value string, rest string) {
|
||||
if !strings.HasPrefix(s, "\"") {
|
||||
return nextToken(s)
|
||||
}
|
||||
s = s[1:]
|
||||
for i := 0; i < len(s); i++ {
|
||||
switch s[i] {
|
||||
case '"':
|
||||
return s[:i], s[i+1:]
|
||||
case '\\':
|
||||
p := make([]byte, len(s)-1)
|
||||
j := copy(p, s[:i])
|
||||
escape := true
|
||||
for i = i + 1; i < len(s); i++ {
|
||||
b := s[i]
|
||||
switch {
|
||||
case escape:
|
||||
escape = false
|
||||
p[j] = b
|
||||
j++
|
||||
case b == '\\':
|
||||
escape = true
|
||||
case b == '"':
|
||||
return string(p[:j]), s[i+1:]
|
||||
default:
|
||||
p[j] = b
|
||||
j++
|
||||
}
|
||||
}
|
||||
return "", ""
|
||||
}
|
||||
}
|
||||
return "", ""
|
||||
}
|
||||
|
||||
// equalASCIIFold returns true if s is equal to t with ASCII case folding as
|
||||
// defined in RFC 4790.
|
||||
func equalASCIIFold(s, t string) bool {
|
||||
for s != "" && t != "" {
|
||||
sr, size := utf8.DecodeRuneInString(s)
|
||||
s = s[size:]
|
||||
tr, size := utf8.DecodeRuneInString(t)
|
||||
t = t[size:]
|
||||
if sr == tr {
|
||||
continue
|
||||
}
|
||||
if 'A' <= sr && sr <= 'Z' {
|
||||
sr = sr + 'a' - 'A'
|
||||
}
|
||||
if 'A' <= tr && tr <= 'Z' {
|
||||
tr = tr + 'a' - 'A'
|
||||
}
|
||||
if sr != tr {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return s == t
|
||||
}
|
||||
|
||||
// tokenListContainsValue returns true if the 1#token header with the given
|
||||
// name contains a token equal to value with ASCII case folding.
|
||||
func tokenListContainsValue(header http.Header, name string, value string) bool {
|
||||
headers:
|
||||
for _, s := range header[name] {
|
||||
for {
|
||||
var t string
|
||||
t, s = nextToken(skipSpace(s))
|
||||
if t == "" {
|
||||
continue headers
|
||||
}
|
||||
s = skipSpace(s)
|
||||
if s != "" && s[0] != ',' {
|
||||
continue headers
|
||||
}
|
||||
if equalASCIIFold(t, value) {
|
||||
return true
|
||||
}
|
||||
if s == "" {
|
||||
continue headers
|
||||
}
|
||||
s = s[1:]
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// parseExtensions parses WebSocket extensions from a header.
|
||||
func parseExtensions(header http.Header) []map[string]string {
|
||||
// From RFC 6455:
|
||||
//
|
||||
// Sec-WebSocket-Extensions = extension-list
|
||||
// extension-list = 1#extension
|
||||
// extension = extension-token *( ";" extension-param )
|
||||
// extension-token = registered-token
|
||||
// registered-token = token
|
||||
// extension-param = token [ "=" (token | quoted-string) ]
|
||||
// ;When using the quoted-string syntax variant, the value
|
||||
// ;after quoted-string unescaping MUST conform to the
|
||||
// ;'token' ABNF.
|
||||
|
||||
var result []map[string]string
|
||||
headers:
|
||||
for _, s := range header["Sec-Websocket-Extensions"] {
|
||||
for {
|
||||
var t string
|
||||
t, s = nextToken(skipSpace(s))
|
||||
if t == "" {
|
||||
continue headers
|
||||
}
|
||||
ext := map[string]string{"": t}
|
||||
for {
|
||||
s = skipSpace(s)
|
||||
if !strings.HasPrefix(s, ";") {
|
||||
break
|
||||
}
|
||||
var k string
|
||||
k, s = nextToken(skipSpace(s[1:]))
|
||||
if k == "" {
|
||||
continue headers
|
||||
}
|
||||
s = skipSpace(s)
|
||||
var v string
|
||||
if strings.HasPrefix(s, "=") {
|
||||
v, s = nextTokenOrQuoted(skipSpace(s[1:]))
|
||||
s = skipSpace(s)
|
||||
}
|
||||
if s != "" && s[0] != ',' && s[0] != ';' {
|
||||
continue headers
|
||||
}
|
||||
ext[k] = v
|
||||
}
|
||||
if s != "" && s[0] != ',' {
|
||||
continue headers
|
||||
}
|
||||
result = append(result, ext)
|
||||
if s == "" {
|
||||
continue headers
|
||||
}
|
||||
s = s[1:]
|
||||
}
|
||||
}
|
||||
return result
|
||||
}
|
||||
@ -0,0 +1,473 @@
|
||||
// Code generated by golang.org/x/tools/cmd/bundle. DO NOT EDIT.
|
||||
//go:generate bundle -o x_net_proxy.go golang.org/x/net/proxy
|
||||
|
||||
// Package proxy provides support for a variety of protocols to proxy network
|
||||
// data.
|
||||
//
|
||||
|
||||
package websocket
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"io"
|
||||
"net"
|
||||
"net/url"
|
||||
"os"
|
||||
"strconv"
|
||||
"strings"
|
||||
"sync"
|
||||
)
|
||||
|
||||
type proxy_direct struct{}
|
||||
|
||||
// Direct is a direct proxy: one that makes network connections directly.
|
||||
var proxy_Direct = proxy_direct{}
|
||||
|
||||
func (proxy_direct) Dial(network, addr string) (net.Conn, error) {
|
||||
return net.Dial(network, addr)
|
||||
}
|
||||
|
||||
// A PerHost directs connections to a default Dialer unless the host name
|
||||
// requested matches one of a number of exceptions.
|
||||
type proxy_PerHost struct {
|
||||
def, bypass proxy_Dialer
|
||||
|
||||
bypassNetworks []*net.IPNet
|
||||
bypassIPs []net.IP
|
||||
bypassZones []string
|
||||
bypassHosts []string
|
||||
}
|
||||
|
||||
// NewPerHost returns a PerHost Dialer that directs connections to either
|
||||
// defaultDialer or bypass, depending on whether the connection matches one of
|
||||
// the configured rules.
|
||||
func proxy_NewPerHost(defaultDialer, bypass proxy_Dialer) *proxy_PerHost {
|
||||
return &proxy_PerHost{
|
||||
def: defaultDialer,
|
||||
bypass: bypass,
|
||||
}
|
||||
}
|
||||
|
||||
// Dial connects to the address addr on the given network through either
|
||||
// defaultDialer or bypass.
|
||||
func (p *proxy_PerHost) Dial(network, addr string) (c net.Conn, err error) {
|
||||
host, _, err := net.SplitHostPort(addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return p.dialerForRequest(host).Dial(network, addr)
|
||||
}
|
||||
|
||||
func (p *proxy_PerHost) dialerForRequest(host string) proxy_Dialer {
|
||||
if ip := net.ParseIP(host); ip != nil {
|
||||
for _, net := range p.bypassNetworks {
|
||||
if net.Contains(ip) {
|
||||
return p.bypass
|
||||
}
|
||||
}
|
||||
for _, bypassIP := range p.bypassIPs {
|
||||
if bypassIP.Equal(ip) {
|
||||
return p.bypass
|
||||
}
|
||||
}
|
||||
return p.def
|
||||
}
|
||||
|
||||
for _, zone := range p.bypassZones {
|
||||
if strings.HasSuffix(host, zone) {
|
||||
return p.bypass
|
||||
}
|
||||
if host == zone[1:] {
|
||||
// For a zone ".example.com", we match "example.com"
|
||||
// too.
|
||||
return p.bypass
|
||||
}
|
||||
}
|
||||
for _, bypassHost := range p.bypassHosts {
|
||||
if bypassHost == host {
|
||||
return p.bypass
|
||||
}
|
||||
}
|
||||
return p.def
|
||||
}
|
||||
|
||||
// AddFromString parses a string that contains comma-separated values
|
||||
// specifying hosts that should use the bypass proxy. Each value is either an
|
||||
// IP address, a CIDR range, a zone (*.example.com) or a host name
|
||||
// (localhost). A best effort is made to parse the string and errors are
|
||||
// ignored.
|
||||
func (p *proxy_PerHost) AddFromString(s string) {
|
||||
hosts := strings.Split(s, ",")
|
||||
for _, host := range hosts {
|
||||
host = strings.TrimSpace(host)
|
||||
if len(host) == 0 {
|
||||
continue
|
||||
}
|
||||
if strings.Contains(host, "/") {
|
||||
// We assume that it's a CIDR address like 127.0.0.0/8
|
||||
if _, net, err := net.ParseCIDR(host); err == nil {
|
||||
p.AddNetwork(net)
|
||||
}
|
||||
continue
|
||||
}
|
||||
if ip := net.ParseIP(host); ip != nil {
|
||||
p.AddIP(ip)
|
||||
continue
|
||||
}
|
||||
if strings.HasPrefix(host, "*.") {
|
||||
p.AddZone(host[1:])
|
||||
continue
|
||||
}
|
||||
p.AddHost(host)
|
||||
}
|
||||
}
|
||||
|
||||
// AddIP specifies an IP address that will use the bypass proxy. Note that
|
||||
// this will only take effect if a literal IP address is dialed. A connection
|
||||
// to a named host will never match an IP.
|
||||
func (p *proxy_PerHost) AddIP(ip net.IP) {
|
||||
p.bypassIPs = append(p.bypassIPs, ip)
|
||||
}
|
||||
|
||||
// AddNetwork specifies an IP range that will use the bypass proxy. Note that
|
||||
// this will only take effect if a literal IP address is dialed. A connection
|
||||
// to a named host will never match.
|
||||
func (p *proxy_PerHost) AddNetwork(net *net.IPNet) {
|
||||
p.bypassNetworks = append(p.bypassNetworks, net)
|
||||
}
|
||||
|
||||
// AddZone specifies a DNS suffix that will use the bypass proxy. A zone of
|
||||
// "example.com" matches "example.com" and all of its subdomains.
|
||||
func (p *proxy_PerHost) AddZone(zone string) {
|
||||
if strings.HasSuffix(zone, ".") {
|
||||
zone = zone[:len(zone)-1]
|
||||
}
|
||||
if !strings.HasPrefix(zone, ".") {
|
||||
zone = "." + zone
|
||||
}
|
||||
p.bypassZones = append(p.bypassZones, zone)
|
||||
}
|
||||
|
||||
// AddHost specifies a host name that will use the bypass proxy.
|
||||
func (p *proxy_PerHost) AddHost(host string) {
|
||||
if strings.HasSuffix(host, ".") {
|
||||
host = host[:len(host)-1]
|
||||
}
|
||||
p.bypassHosts = append(p.bypassHosts, host)
|
||||
}
|
||||
|
||||
// A Dialer is a means to establish a connection.
|
||||
type proxy_Dialer interface {
|
||||
// Dial connects to the given address via the proxy.
|
||||
Dial(network, addr string) (c net.Conn, err error)
|
||||
}
|
||||
|
||||
// Auth contains authentication parameters that specific Dialers may require.
|
||||
type proxy_Auth struct {
|
||||
User, Password string
|
||||
}
|
||||
|
||||
// FromEnvironment returns the dialer specified by the proxy related variables in
|
||||
// the environment.
|
||||
func proxy_FromEnvironment() proxy_Dialer {
|
||||
allProxy := proxy_allProxyEnv.Get()
|
||||
if len(allProxy) == 0 {
|
||||
return proxy_Direct
|
||||
}
|
||||
|
||||
proxyURL, err := url.Parse(allProxy)
|
||||
if err != nil {
|
||||
return proxy_Direct
|
||||
}
|
||||
proxy, err := proxy_FromURL(proxyURL, proxy_Direct)
|
||||
if err != nil {
|
||||
return proxy_Direct
|
||||
}
|
||||
|
||||
noProxy := proxy_noProxyEnv.Get()
|
||||
if len(noProxy) == 0 {
|
||||
return proxy
|
||||
}
|
||||
|
||||
perHost := proxy_NewPerHost(proxy, proxy_Direct)
|
||||
perHost.AddFromString(noProxy)
|
||||
return perHost
|
||||
}
|
||||
|
||||
// proxySchemes is a map from URL schemes to a function that creates a Dialer
|
||||
// from a URL with such a scheme.
|
||||
var proxy_proxySchemes map[string]func(*url.URL, proxy_Dialer) (proxy_Dialer, error)
|
||||
|
||||
// RegisterDialerType takes a URL scheme and a function to generate Dialers from
|
||||
// a URL with that scheme and a forwarding Dialer. Registered schemes are used
|
||||
// by FromURL.
|
||||
func proxy_RegisterDialerType(scheme string, f func(*url.URL, proxy_Dialer) (proxy_Dialer, error)) {
|
||||
if proxy_proxySchemes == nil {
|
||||
proxy_proxySchemes = make(map[string]func(*url.URL, proxy_Dialer) (proxy_Dialer, error))
|
||||
}
|
||||
proxy_proxySchemes[scheme] = f
|
||||
}
|
||||
|
||||
// FromURL returns a Dialer given a URL specification and an underlying
|
||||
// Dialer for it to make network requests.
|
||||
func proxy_FromURL(u *url.URL, forward proxy_Dialer) (proxy_Dialer, error) {
|
||||
var auth *proxy_Auth
|
||||
if u.User != nil {
|
||||
auth = new(proxy_Auth)
|
||||
auth.User = u.User.Username()
|
||||
if p, ok := u.User.Password(); ok {
|
||||
auth.Password = p
|
||||
}
|
||||
}
|
||||
|
||||
switch u.Scheme {
|
||||
case "socks5":
|
||||
return proxy_SOCKS5("tcp", u.Host, auth, forward)
|
||||
}
|
||||
|
||||
// If the scheme doesn't match any of the built-in schemes, see if it
|
||||
// was registered by another package.
|
||||
if proxy_proxySchemes != nil {
|
||||
if f, ok := proxy_proxySchemes[u.Scheme]; ok {
|
||||
return f(u, forward)
|
||||
}
|
||||
}
|
||||
|
||||
return nil, errors.New("proxy: unknown scheme: " + u.Scheme)
|
||||
}
|
||||
|
||||
var (
|
||||
proxy_allProxyEnv = &proxy_envOnce{
|
||||
names: []string{"ALL_PROXY", "all_proxy"},
|
||||
}
|
||||
proxy_noProxyEnv = &proxy_envOnce{
|
||||
names: []string{"NO_PROXY", "no_proxy"},
|
||||
}
|
||||
)
|
||||
|
||||
// envOnce looks up an environment variable (optionally by multiple
|
||||
// names) once. It mitigates expensive lookups on some platforms
|
||||
// (e.g. Windows).
|
||||
// (Borrowed from net/http/transport.go)
|
||||
type proxy_envOnce struct {
|
||||
names []string
|
||||
once sync.Once
|
||||
val string
|
||||
}
|
||||
|
||||
func (e *proxy_envOnce) Get() string {
|
||||
e.once.Do(e.init)
|
||||
return e.val
|
||||
}
|
||||
|
||||
func (e *proxy_envOnce) init() {
|
||||
for _, n := range e.names {
|
||||
e.val = os.Getenv(n)
|
||||
if e.val != "" {
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// SOCKS5 returns a Dialer that makes SOCKSv5 connections to the given address
|
||||
// with an optional username and password. See RFC 1928 and RFC 1929.
|
||||
func proxy_SOCKS5(network, addr string, auth *proxy_Auth, forward proxy_Dialer) (proxy_Dialer, error) {
|
||||
s := &proxy_socks5{
|
||||
network: network,
|
||||
addr: addr,
|
||||
forward: forward,
|
||||
}
|
||||
if auth != nil {
|
||||
s.user = auth.User
|
||||
s.password = auth.Password
|
||||
}
|
||||
|
||||
return s, nil
|
||||
}
|
||||
|
||||
type proxy_socks5 struct {
|
||||
user, password string
|
||||
network, addr string
|
||||
forward proxy_Dialer
|
||||
}
|
||||
|
||||
const proxy_socks5Version = 5
|
||||
|
||||
const (
|
||||
proxy_socks5AuthNone = 0
|
||||
proxy_socks5AuthPassword = 2
|
||||
)
|
||||
|
||||
const proxy_socks5Connect = 1
|
||||
|
||||
const (
|
||||
proxy_socks5IP4 = 1
|
||||
proxy_socks5Domain = 3
|
||||
proxy_socks5IP6 = 4
|
||||
)
|
||||
|
||||
var proxy_socks5Errors = []string{
|
||||
"",
|
||||
"general failure",
|
||||
"connection forbidden",
|
||||
"network unreachable",
|
||||
"host unreachable",
|
||||
"connection refused",
|
||||
"TTL expired",
|
||||
"command not supported",
|
||||
"address type not supported",
|
||||
}
|
||||
|
||||
// Dial connects to the address addr on the given network via the SOCKS5 proxy.
|
||||
func (s *proxy_socks5) Dial(network, addr string) (net.Conn, error) {
|
||||
switch network {
|
||||
case "tcp", "tcp6", "tcp4":
|
||||
default:
|
||||
return nil, errors.New("proxy: no support for SOCKS5 proxy connections of type " + network)
|
||||
}
|
||||
|
||||
conn, err := s.forward.Dial(s.network, s.addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if err := s.connect(conn, addr); err != nil {
|
||||
conn.Close()
|
||||
return nil, err
|
||||
}
|
||||
return conn, nil
|
||||
}
|
||||
|
||||
// connect takes an existing connection to a socks5 proxy server,
|
||||
// and commands the server to extend that connection to target,
|
||||
// which must be a canonical address with a host and port.
|
||||
func (s *proxy_socks5) connect(conn net.Conn, target string) error {
|
||||
host, portStr, err := net.SplitHostPort(target)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
port, err := strconv.Atoi(portStr)
|
||||
if err != nil {
|
||||
return errors.New("proxy: failed to parse port number: " + portStr)
|
||||
}
|
||||
if port < 1 || port > 0xffff {
|
||||
return errors.New("proxy: port number out of range: " + portStr)
|
||||
}
|
||||
|
||||
// the size here is just an estimate
|
||||
buf := make([]byte, 0, 6+len(host))
|
||||
|
||||
buf = append(buf, proxy_socks5Version)
|
||||
if len(s.user) > 0 && len(s.user) < 256 && len(s.password) < 256 {
|
||||
buf = append(buf, 2 /* num auth methods */, proxy_socks5AuthNone, proxy_socks5AuthPassword)
|
||||
} else {
|
||||
buf = append(buf, 1 /* num auth methods */, proxy_socks5AuthNone)
|
||||
}
|
||||
|
||||
if _, err := conn.Write(buf); err != nil {
|
||||
return errors.New("proxy: failed to write greeting to SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
if _, err := io.ReadFull(conn, buf[:2]); err != nil {
|
||||
return errors.New("proxy: failed to read greeting from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
if buf[0] != 5 {
|
||||
return errors.New("proxy: SOCKS5 proxy at " + s.addr + " has unexpected version " + strconv.Itoa(int(buf[0])))
|
||||
}
|
||||
if buf[1] == 0xff {
|
||||
return errors.New("proxy: SOCKS5 proxy at " + s.addr + " requires authentication")
|
||||
}
|
||||
|
||||
// See RFC 1929
|
||||
if buf[1] == proxy_socks5AuthPassword {
|
||||
buf = buf[:0]
|
||||
buf = append(buf, 1 /* password protocol version */)
|
||||
buf = append(buf, uint8(len(s.user)))
|
||||
buf = append(buf, s.user...)
|
||||
buf = append(buf, uint8(len(s.password)))
|
||||
buf = append(buf, s.password...)
|
||||
|
||||
if _, err := conn.Write(buf); err != nil {
|
||||
return errors.New("proxy: failed to write authentication request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
if _, err := io.ReadFull(conn, buf[:2]); err != nil {
|
||||
return errors.New("proxy: failed to read authentication reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
if buf[1] != 0 {
|
||||
return errors.New("proxy: SOCKS5 proxy at " + s.addr + " rejected username/password")
|
||||
}
|
||||
}
|
||||
|
||||
buf = buf[:0]
|
||||
buf = append(buf, proxy_socks5Version, proxy_socks5Connect, 0 /* reserved */)
|
||||
|
||||
if ip := net.ParseIP(host); ip != nil {
|
||||
if ip4 := ip.To4(); ip4 != nil {
|
||||
buf = append(buf, proxy_socks5IP4)
|
||||
ip = ip4
|
||||
} else {
|
||||
buf = append(buf, proxy_socks5IP6)
|
||||
}
|
||||
buf = append(buf, ip...)
|
||||
} else {
|
||||
if len(host) > 255 {
|
||||
return errors.New("proxy: destination host name too long: " + host)
|
||||
}
|
||||
buf = append(buf, proxy_socks5Domain)
|
||||
buf = append(buf, byte(len(host)))
|
||||
buf = append(buf, host...)
|
||||
}
|
||||
buf = append(buf, byte(port>>8), byte(port))
|
||||
|
||||
if _, err := conn.Write(buf); err != nil {
|
||||
return errors.New("proxy: failed to write connect request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
if _, err := io.ReadFull(conn, buf[:4]); err != nil {
|
||||
return errors.New("proxy: failed to read connect reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
failure := "unknown error"
|
||||
if int(buf[1]) < len(proxy_socks5Errors) {
|
||||
failure = proxy_socks5Errors[buf[1]]
|
||||
}
|
||||
|
||||
if len(failure) > 0 {
|
||||
return errors.New("proxy: SOCKS5 proxy at " + s.addr + " failed to connect: " + failure)
|
||||
}
|
||||
|
||||
bytesToDiscard := 0
|
||||
switch buf[3] {
|
||||
case proxy_socks5IP4:
|
||||
bytesToDiscard = net.IPv4len
|
||||
case proxy_socks5IP6:
|
||||
bytesToDiscard = net.IPv6len
|
||||
case proxy_socks5Domain:
|
||||
_, err := io.ReadFull(conn, buf[:1])
|
||||
if err != nil {
|
||||
return errors.New("proxy: failed to read domain length from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
bytesToDiscard = int(buf[0])
|
||||
default:
|
||||
return errors.New("proxy: got unknown address type " + strconv.Itoa(int(buf[3])) + " from SOCKS5 proxy at " + s.addr)
|
||||
}
|
||||
|
||||
if cap(buf) < bytesToDiscard {
|
||||
buf = make([]byte, bytesToDiscard)
|
||||
} else {
|
||||
buf = buf[:bytesToDiscard]
|
||||
}
|
||||
if _, err := io.ReadFull(conn, buf); err != nil {
|
||||
return errors.New("proxy: failed to read address from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
// Also need to discard the port number
|
||||
if _, err := io.ReadFull(conn, buf[:2]); err != nil {
|
||||
return errors.New("proxy: failed to read port from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
Loading…
Reference in New Issue