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// Copyright (c) 2021 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package whatsmeow
import (
"bytes"
"context"
"crypto/hmac"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"fmt"
"net/http"
"net/url"
"go.mau.fi/whatsmeow/socket"
"go.mau.fi/whatsmeow/util/cbcutil"
)
// UploadResponse contains the data from the attachment upload, which can be put into a message to send the attachment.
type UploadResponse struct {
URL string
DirectPath string
MediaKey []byte
FileEncSHA256 []byte
FileSHA256 []byte
FileLength uint64
}
// Upload uploads the given attachment to WhatsApp servers.
func (cli *Client) Upload(ctx context.Context, plaintext []byte, appInfo MediaType) (resp UploadResponse, err error) {
resp.FileLength = uint64(len(plaintext))
resp.MediaKey = make([]byte, 32)
_, err = rand.Read(resp.MediaKey)
if err != nil {
return
}
plaintextSHA256 := sha256.Sum256(plaintext)
resp.FileSHA256 = plaintextSHA256[:]
iv, cipherKey, macKey, _ := getMediaKeys(resp.MediaKey, appInfo)
var ciphertext []byte
ciphertext, err = cbcutil.Encrypt(cipherKey, iv, plaintext)
if err != nil {
err = fmt.Errorf("failed to encrypt file: %w", err)
return
}
h := hmac.New(sha256.New, macKey)
h.Write(iv)
h.Write(ciphertext)
dataToUpload := append(ciphertext, h.Sum(nil)[:10]...)
fileEncSHA256 := sha256.Sum256(dataToUpload)
resp.FileEncSHA256 = fileEncSHA256[:]
err = cli.refreshMediaConn(false)
if err != nil {
err = fmt.Errorf("failed to refresh media connections: %w", err)
return
}
token := base64.URLEncoding.EncodeToString(resp.FileEncSHA256)
q := url.Values{
"auth": []string{cli.mediaConn.Auth},
"token": []string{token},
}
mmsType := mediaTypeToMMSType[appInfo]
uploadURL := url.URL{
Scheme: "https",
Host: cli.mediaConn.Hosts[0].Hostname,
Path: fmt.Sprintf("/mms/%s/%s", mmsType, token),
RawQuery: q.Encode(),
}
var req *http.Request
req, err = http.NewRequestWithContext(ctx, http.MethodPost, uploadURL.String(), bytes.NewReader(dataToUpload))
if err != nil {
err = fmt.Errorf("failed to prepare request: %w", err)
return
}
req.Header.Set("Origin", socket.Origin)
req.Header.Set("Referer", socket.Origin+"/")
var httpResp *http.Response
httpResp, err = http.DefaultClient.Do(req)
if err != nil {
err = fmt.Errorf("failed to execute request: %w", err)
} else if httpResp.StatusCode != http.StatusOK {
err = fmt.Errorf("upload failed with status code %d", httpResp.StatusCode)
} else if err = json.NewDecoder(httpResp.Body).Decode(&resp); err != nil {
err = fmt.Errorf("failed to parse upload response: %w", err)
}
if httpResp != nil {
_ = httpResp.Body.Close()
}
return
}
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