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143 lines
3.3 KiB
Go
143 lines
3.3 KiB
Go
package whatsapp
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"strings"
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"github.com/Rhymen/go-whatsapp/binary"
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"github.com/Rhymen/go-whatsapp/crypto/cbc"
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"github.com/gorilla/websocket"
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"github.com/pkg/errors"
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)
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func (wac *Conn) readPump() {
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defer func() {
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wac.wg.Done()
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_, _ = wac.Disconnect()
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}()
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var readErr error
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var msgType int
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var reader io.Reader
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for {
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readerFound := make(chan struct{})
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go func() {
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if wac.ws != nil {
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msgType, reader, readErr = wac.ws.conn.NextReader()
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}
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close(readerFound)
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}()
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select {
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case <-readerFound:
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if readErr != nil {
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wac.handle(&ErrConnectionFailed{Err: readErr})
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return
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}
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msg, err := ioutil.ReadAll(reader)
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if err != nil {
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wac.handle(errors.Wrap(err, "error reading message from Reader"))
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continue
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}
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err = wac.processReadData(msgType, msg)
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if err != nil {
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wac.handle(errors.Wrap(err, "error processing data"))
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}
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case <-wac.ws.close:
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return
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}
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}
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}
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func (wac *Conn) processReadData(msgType int, msg []byte) error {
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data := strings.SplitN(string(msg), ",", 2)
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if data[0][0] == '!' { //Keep-Alive Timestamp
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data = append(data, data[0][1:]) //data[1]
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data[0] = "!"
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}
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if len(data) == 2 && len(data[1]) == 0 {
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return nil
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}
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if len(data) != 2 || len(data[1]) == 0 {
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return ErrInvalidWsData
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}
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wac.listener.RLock()
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listener, hasListener := wac.listener.m[data[0]]
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wac.listener.RUnlock()
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if hasListener {
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// listener only exists for TextMessages query messages out of contact.go
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// If these binary query messages can be handled another way,
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// then the TextMessages, which are all JSON encoded, can directly
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// be unmarshalled. The listener chan could then be changed from type
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// chan string to something like chan map[string]interface{}. The unmarshalling
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// in several places, especially in session.go, would then be gone.
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listener <- data[1]
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close(listener)
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wac.removeListener(data[0])
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} else if msgType == websocket.BinaryMessage {
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wac.loginSessionLock.RLock()
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sess := wac.session
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wac.loginSessionLock.RUnlock()
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if sess == nil || sess.MacKey == nil || sess.EncKey == nil {
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return ErrInvalidWsState
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}
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message, err := wac.decryptBinaryMessage([]byte(data[1]))
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if err != nil {
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return errors.Wrap(err, "error decoding binary")
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}
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wac.dispatch(message)
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} else { //RAW json status updates
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wac.handle(string(data[1]))
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}
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return nil
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}
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func (wac *Conn) decryptBinaryMessage(msg []byte) (*binary.Node, error) {
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//message validation
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h2 := hmac.New(sha256.New, wac.session.MacKey)
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if len(msg) < 33 {
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var response struct {
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Status int `json:"status"`
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}
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if err := json.Unmarshal(msg, &response); err == nil {
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if response.Status == http.StatusNotFound {
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return nil, ErrServerRespondedWith404
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}
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return nil, errors.New(fmt.Sprintf("server responded with %d", response.Status))
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}
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return nil, ErrInvalidServerResponse
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}
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h2.Write([]byte(msg[32:]))
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if !hmac.Equal(h2.Sum(nil), msg[:32]) {
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return nil, ErrInvalidHmac
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}
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// message decrypt
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d, err := cbc.Decrypt(wac.session.EncKey, nil, msg[32:])
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if err != nil {
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return nil, errors.Wrap(err, "decrypting message with AES-CBC failed")
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}
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// message unmarshal
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message, err := binary.Unmarshal(d)
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if err != nil {
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return nil, errors.Wrap(err, "could not decode binary")
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}
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return message, nil
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}
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