forked from jshiffer/matterbridge
248 lines
8.4 KiB
Go
248 lines
8.4 KiB
Go
// Copyright (c) 2024 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/sha256"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"os"
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"go.mau.fi/util/random"
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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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Handle string `json:"handle"`
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ObjectID string `json:"object_id"`
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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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//
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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 := &waE2E.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, &waE2E.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 = random.Bytes(32)
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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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dataHash := sha256.Sum256(dataToUpload)
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resp.FileEncSHA256 = dataHash[:]
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err = cli.rawUpload(ctx, bytes.NewReader(dataToUpload), resp.FileEncSHA256, appInfo, false, &resp)
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return
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}
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// UploadReader uploads the given attachment to WhatsApp servers.
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//
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// This is otherwise identical to [Upload], but it reads the plaintext from an [io.Reader] instead of a byte slice.
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// A temporary file is required for the encryption process. If tempFile is nil, a temporary file will be created
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// and deleted after the upload.
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func (cli *Client) UploadReader(ctx context.Context, plaintext io.Reader, tempFile io.ReadWriteSeeker, appInfo MediaType) (resp UploadResponse, err error) {
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resp.MediaKey = random.Bytes(32)
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iv, cipherKey, macKey, _ := getMediaKeys(resp.MediaKey, appInfo)
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if tempFile == nil {
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tempFile, err = os.CreateTemp("", "whatsmeow-upload-*")
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if err != nil {
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err = fmt.Errorf("failed to create temporary file: %w", err)
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return
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}
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defer func() {
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tempFileFile := tempFile.(*os.File)
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_ = tempFileFile.Close()
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_ = os.Remove(tempFileFile.Name())
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}()
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}
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resp.FileSHA256, resp.FileEncSHA256, resp.FileLength, err = cbcutil.EncryptStream(cipherKey, iv, macKey, plaintext, tempFile)
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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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_, err = tempFile.Seek(0, io.SeekStart)
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if err != nil {
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err = fmt.Errorf("failed to seek to start of temporary file: %w", err)
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return
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}
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err = cli.rawUpload(ctx, tempFile, resp.FileEncSHA256, appInfo, false, &resp)
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return
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}
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// UploadNewsletter uploads the given attachment to WhatsApp servers without encrypting it first.
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//
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// Newsletter media works mostly the same way as normal media, with a few differences:
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// * Since it's unencrypted, there's no MediaKey or FileEncSHA256 fields.
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// * There's a "media handle" that needs to be passed in SendRequestExtra.
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//
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// Example:
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//
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// resp, err := cli.UploadNewsletter(context.Background(), yourImageBytes, whatsmeow.MediaImage)
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// // handle error
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//
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// imageMsg := &waE2E.ImageMessage{
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// // Caption, mime type and other such fields work like normal
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// Caption: proto.String("Hello, world!"),
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// Mimetype: proto.String("image/png"),
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//
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// // URL and direct path are also there like normal media
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// URL: &resp.URL,
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// DirectPath: &resp.DirectPath,
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// FileSHA256: resp.FileSHA256,
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// FileLength: &resp.FileLength,
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// // Newsletter media isn't encrypted, so the media key and file enc sha fields are not applicable
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// }
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// _, err = cli.SendMessage(context.Background(), newsletterJID, &waE2E.Message{
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// ImageMessage: imageMsg,
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// }, whatsmeow.SendRequestExtra{
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// // Unlike normal media, newsletters also include a "media handle" in the send request.
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// MediaHandle: resp.Handle,
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// })
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// // handle error again
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func (cli *Client) UploadNewsletter(ctx context.Context, data []byte, appInfo MediaType) (resp UploadResponse, err error) {
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resp.FileLength = uint64(len(data))
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hash := sha256.Sum256(data)
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resp.FileSHA256 = hash[:]
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err = cli.rawUpload(ctx, bytes.NewReader(data), resp.FileSHA256, appInfo, true, &resp)
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return
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}
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// UploadNewsletterReader uploads the given attachment to WhatsApp servers without encrypting it first.
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//
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// This is otherwise identical to [UploadNewsletter], but it reads the plaintext from an [io.Reader] instead of a byte slice.
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// Unlike [UploadReader], this does not require a temporary file. However, the data needs to be hashed first,
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// so an [io.ReadSeeker] is required to be able to read the data twice.
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func (cli *Client) UploadNewsletterReader(ctx context.Context, data io.ReadSeeker, appInfo MediaType) (resp UploadResponse, err error) {
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hasher := sha256.New()
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var fileLength int64
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fileLength, err = io.Copy(hasher, data)
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resp.FileLength = uint64(fileLength)
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resp.FileSHA256 = hasher.Sum(nil)
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_, err = data.Seek(0, io.SeekStart)
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if err != nil {
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err = fmt.Errorf("failed to seek to start of data: %w", err)
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return
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}
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err = cli.rawUpload(ctx, data, resp.FileSHA256, appInfo, true, &resp)
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return
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}
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func (cli *Client) rawUpload(ctx context.Context, dataToUpload io.Reader, fileHash []byte, appInfo MediaType, newsletter bool, resp *UploadResponse) error {
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mediaConn, err := cli.refreshMediaConn(false)
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if err != nil {
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return fmt.Errorf("failed to refresh media connections: %w", err)
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}
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token := base64.URLEncoding.EncodeToString(fileHash)
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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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uploadPrefix := "mms"
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if cli.MessengerConfig != nil {
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uploadPrefix = "wa-msgr/mms"
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// Messenger upload only allows voice messages, not audio files
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if mmsType == "audio" {
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mmsType = "ptt"
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}
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}
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if newsletter {
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mmsType = fmt.Sprintf("newsletter-%s", mmsType)
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uploadPrefix = "newsletter"
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}
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var host string
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// Hacky hack to prefer last option (rupload.facebook.com) for messenger uploads.
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// For some reason, the primary host doesn't work, even though it has the <upload/> tag.
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if cli.MessengerConfig != nil {
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host = mediaConn.Hosts[len(mediaConn.Hosts)-1].Hostname
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} else {
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host = mediaConn.Hosts[0].Hostname
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}
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uploadURL := url.URL{
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Scheme: "https",
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Host: host,
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Path: fmt.Sprintf("/%s/%s/%s", uploadPrefix, mmsType, token),
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RawQuery: q.Encode(),
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, uploadURL.String(), dataToUpload)
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if err != nil {
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return fmt.Errorf("failed to prepare request: %w", err)
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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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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 err
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}
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