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134 lines
3.9 KiB
Go
134 lines
3.9 KiB
Go
// Copyright (c) 2021 Tulir Asokan
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package whatsmeow
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import (
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"bytes"
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"context"
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"go.mau.fi/whatsmeow/socket"
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"go.mau.fi/whatsmeow/util/cbcutil"
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)
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// UploadResponse contains the data from the attachment upload, which can be put into a message to send the attachment.
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type UploadResponse struct {
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URL string `json:"url"`
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DirectPath string `json:"direct_path"`
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MediaKey []byte `json:"-"`
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FileEncSHA256 []byte `json:"-"`
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FileSHA256 []byte `json:"-"`
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FileLength uint64 `json:"-"`
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}
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// Upload uploads the given attachment to WhatsApp servers.
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//
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// You should copy the fields in the response to the corresponding fields in a protobuf message.
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//
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// For example, to send an image:
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// resp, err := cli.Upload(context.Background(), yourImageBytes, whatsmeow.MediaImage)
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// // handle error
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//
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// imageMsg := &waProto.ImageMessage{
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// Caption: proto.String("Hello, world!"),
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// Mimetype: proto.String("image/png"), // replace this with the actual mime type
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// // you can also optionally add other fields like ContextInfo and JpegThumbnail here
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//
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// Url: &resp.URL,
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// DirectPath: &resp.DirectPath,
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// MediaKey: resp.MediaKey,
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// FileEncSha256: resp.FileEncSHA256,
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// FileSha256: resp.FileSha256,
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// FileLength: &resp.FileLength,
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// }
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// _, err = cli.SendMessage(context.Background(), targetJID, "", &waProto.Message{
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// ImageMessage: imageMsg,
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// })
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// // handle error again
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//
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// The same applies to the other message types like DocumentMessage, just replace the struct type and Message field name.
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func (cli *Client) Upload(ctx context.Context, plaintext []byte, appInfo MediaType) (resp UploadResponse, err error) {
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resp.FileLength = uint64(len(plaintext))
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resp.MediaKey = make([]byte, 32)
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_, err = rand.Read(resp.MediaKey)
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if err != nil {
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return
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}
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plaintextSHA256 := sha256.Sum256(plaintext)
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resp.FileSHA256 = plaintextSHA256[:]
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iv, cipherKey, macKey, _ := getMediaKeys(resp.MediaKey, appInfo)
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var ciphertext []byte
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ciphertext, err = cbcutil.Encrypt(cipherKey, iv, plaintext)
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if err != nil {
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err = fmt.Errorf("failed to encrypt file: %w", err)
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return
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}
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h := hmac.New(sha256.New, macKey)
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h.Write(iv)
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h.Write(ciphertext)
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dataToUpload := append(ciphertext, h.Sum(nil)[:10]...)
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fileEncSHA256 := sha256.Sum256(dataToUpload)
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resp.FileEncSHA256 = fileEncSHA256[:]
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var mediaConn *MediaConn
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mediaConn, err = cli.refreshMediaConn(false)
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if err != nil {
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err = fmt.Errorf("failed to refresh media connections: %w", err)
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return
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}
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token := base64.URLEncoding.EncodeToString(resp.FileEncSHA256)
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q := url.Values{
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"auth": []string{mediaConn.Auth},
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"token": []string{token},
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}
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mmsType := mediaTypeToMMSType[appInfo]
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uploadURL := url.URL{
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Scheme: "https",
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Host: mediaConn.Hosts[0].Hostname,
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Path: fmt.Sprintf("/mms/%s/%s", mmsType, token),
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RawQuery: q.Encode(),
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}
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var req *http.Request
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req, err = http.NewRequestWithContext(ctx, http.MethodPost, uploadURL.String(), bytes.NewReader(dataToUpload))
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if err != nil {
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err = fmt.Errorf("failed to prepare request: %w", err)
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return
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}
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req.Header.Set("Origin", socket.Origin)
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req.Header.Set("Referer", socket.Origin+"/")
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var httpResp *http.Response
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httpResp, err = cli.http.Do(req)
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if err != nil {
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err = fmt.Errorf("failed to execute request: %w", err)
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} else if httpResp.StatusCode != http.StatusOK {
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err = fmt.Errorf("upload failed with status code %d", httpResp.StatusCode)
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} else if err = json.NewDecoder(httpResp.Body).Decode(&resp); err != nil {
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err = fmt.Errorf("failed to parse upload response: %w", err)
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}
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if httpResp != nil {
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_ = httpResp.Body.Close()
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}
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return
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}
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