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923 lines (766 loc) · 24.6 KB
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package main
import (
"bytes"
"context"
"crypto/aes"
"crypto/cipher"
"crypto/hmac"
"crypto/rand"
"crypto/sha256"
"encoding/binary"
"encoding/hex"
"encoding/json"
"fmt"
"image"
_ "image/gif"
"image/jpeg"
_ "image/png"
"io"
"net/http"
"net/url"
"os"
"os/exec"
"regexp"
"runtime/debug"
"strings"
"sync"
"time"
"github.com/go-resty/resty/v2"
"golang.org/x/sync/singleflight"
"github.com/patrickmn/go-cache"
_ "golang.org/x/image/webp"
"github.com/PuerkitoBio/goquery"
"github.com/jmoiron/sqlx"
"github.com/nfnt/resize"
"github.com/rs/zerolog/log"
"github.com/vincent-petithory/dataurl"
)
const (
openGraphFetchTimeout = 5 * time.Second
openGraphPageMaxBytes = 2 * 1024 * 1024 // 2MB
openGraphImageMaxBytes = 10 * 1024 * 1024 // 10MB
openGraphThumbnailWidth = 100
openGraphThumbnailHeight = 100
openGraphJpegQuality = 80
openGraphMaxImageDim = 4000 // Max width or height for Open Graph images
openGraphUserFetchLimit = 20 // Limit concurrent Open Graph fetches per user
)
type WebhookFileErrorPayload struct {
URL string `json:"url"`
Payload map[string]interface{} `json:"payload"`
UserID string `json:"userID"`
EncryptedHmacKey string `json:"encryptedHmacKey"`
FilePath string `json:"filePath"`
AttemptTime time.Time `json:"attemptTime"`
ErrorMessage string `json:"errorMessage"`
}
type WebhookErrorPayload struct {
URL string `json:"url"`
Payload map[string]interface{} `json:"payload"`
UserID string `json:"userID"`
EncryptedHmacKey string `json:"encryptedHmacKey"`
AttemptTime time.Time `json:"attemptTime"`
ErrorMessage string `json:"errorMessage"`
}
type openGraphResult struct {
Title string
Description string
ImageData []byte
}
type UserSemaphoreManager struct {
pools sync.Map
}
func NewUserSemaphoreManager() *UserSemaphoreManager {
return &UserSemaphoreManager{}
}
func (usm *UserSemaphoreManager) ForUser(userID string) chan struct{} {
// LoadOrStore provides an atomic way to get or create a semaphore.
pool, _ := usm.pools.LoadOrStore(userID, make(chan struct{}, openGraphUserFetchLimit))
return pool.(chan struct{})
}
var (
urlRegex = regexp.MustCompile(`https?://[^\s"']*[^\"'\s\.,!?()[\]{}]`)
userSemaphoreManager = NewUserSemaphoreManager()
openGraphGroup singleflight.Group
openGraphCache = cache.New(5*time.Minute, 10*time.Minute) // Cache Open Graph data for 5 minutes, cleanup every 10 minutes
)
func Find(slice []string, val string) bool {
for _, item := range slice {
if item == val {
return true
}
}
return false
}
func isHTTPURL(input string) bool {
parsed, err := url.ParseRequestURI(input)
if err != nil {
return false
}
if parsed.Scheme != "http" && parsed.Scheme != "https" {
return false
}
return parsed.Host != ""
}
func fetchURLBytes(ctx context.Context, resourceURL string, limit int64) ([]byte, string, error) {
req, err := http.NewRequestWithContext(ctx, "GET", resourceURL, nil)
if err != nil {
return nil, "", err
}
resp, err := globalHTTPClient.Do(req)
if err != nil {
return nil, "", err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
return nil, "", fmt.Errorf("unexpected status code %d", resp.StatusCode)
}
lr := io.LimitReader(resp.Body, limit+1)
data, err := io.ReadAll(lr)
if err != nil {
return nil, "", err
}
if int64(len(data)) > limit {
return nil, "", fmt.Errorf("response exceeds allowed size (%d bytes)", limit)
}
contentType := resp.Header.Get("Content-Type")
if contentType == "" {
contentType = http.DetectContentType(data)
}
return data, contentType, nil
}
func getOpenGraphData(ctx context.Context, urlStr string, userID string) (title, description string, imageData []byte) {
// Check cache first
if cachedData, found := openGraphCache.Get(urlStr); found {
if data, ok := cachedData.(openGraphResult); ok {
log.Debug().Str("url", urlStr).Msg("Open Graph data fetched from cache")
return data.Title, data.Description, data.ImageData
}
}
v, err, _ := openGraphGroup.Do(urlStr, func() (res any, err error) {
ctx, cancel := context.WithTimeout(ctx, openGraphFetchTimeout)
defer cancel()
// Acquire a token from the semaphore pool
userPool := userSemaphoreManager.ForUser(userID)
select {
case userPool <- struct{}{}:
defer func() { <-userPool }()
case <-ctx.Done():
log.Warn().Str("url", urlStr).Msg("Open Graph data fetch timed out while waiting for a worker")
return nil, ctx.Err()
}
// Recover from panics and convert to error
defer func() {
if r := recover(); r != nil {
stack := debug.Stack()
log.Error().
Interface("panic_info", r).
Str("url", urlStr).
Bytes("stack", stack).
Msg("Panic recovered while fetching Open Graph data")
err = fmt.Errorf("panic: %v", r)
}
}()
// Fetch Open Graph data
title, description, imageData := fetchOpenGraphData(ctx, urlStr)
// Store in cache
openGraphCache.Set(urlStr, openGraphResult{title, description, imageData}, cache.DefaultExpiration)
return openGraphResult{title, description, imageData}, nil
})
if err != nil {
log.Error().Err(err).Str("url", urlStr).Msg("Error fetching Open Graph data via singleflight")
return "", "", nil
}
if v == nil {
return "", "", nil
}
data := v.(openGraphResult)
return data.Title, data.Description, data.ImageData
}
// Update entry in User map
func updateUserInfo(values interface{}, field string, value string) interface{} {
log.Debug().Str("field", field).Str("value", value).Msg("User info updated")
values.(Values).m[field] = value
return values
}
// webhook for regular messages
func callHook(myurl string, payload map[string]string, userID string) {
callHookWithHmac(myurl, payload, userID, nil)
}
// webhook for regular messages with HMAC
func callHookWithHmac(myurl string, payload map[string]string, userID string, encryptedHmacKey []byte) {
log.Info().Str("url", myurl).Str("userID", userID).Msg("Sending POST to client with retry logic")
client := clientManager.GetHTTPClient(userID)
// Retry settings
maxRetries := 1
if *webhookRetryEnabled {
maxRetries = *webhookRetryCount
}
var lastError error
var body interface{} = payload
// Starts the retry loop.
for attempt := 0; attempt < maxRetries; attempt++ {
if attempt > 0 {
backoffFactor := 1 << uint(attempt-1)
// Calculate the final delay.
delayDuration := time.Duration(*webhookRetryDelaySeconds) * time.Second * time.Duration(backoffFactor)
log.Warn().
Int("attempt", attempt+1).
Str("url", myurl).
Dur("delay", delayDuration).
Msg("Retrying webhook request with exponential backoff...")
time.Sleep(delayDuration)
}
var req *resty.Request
var hmacSignature string
var marshalErr error
format := os.Getenv("WEBHOOK_FORMAT")
if format == "json" {
var jsonBody []byte
if jsonStr, ok := payload["jsonData"]; ok {
var postmap map[string]interface{}
if err := json.Unmarshal([]byte(jsonStr), &postmap); err == nil {
if instanceName, ok := payload["instanceName"]; ok {
postmap["instanceName"] = instanceName
}
postmap["userID"] = userID
body = postmap
}
}
// Marshal body to JSON for HMAC signature
jsonBody, marshalErr = json.Marshal(body)
if marshalErr != nil {
log.Error().Err(marshalErr).Msg("Failed to marshal body for HMAC")
}
// Generate HMAC signature if key exists
if len(encryptedHmacKey) > 0 && len(jsonBody) > 0 {
var err error
hmacSignature, err = generateHmacSignature(jsonBody, encryptedHmacKey)
if err != nil {
log.Error().Err(err).Msg("Failed to generate HMAC signature")
}
}
req = client.R().SetHeader("Content-Type", "application/json").SetBody(body)
} else {
if len(encryptedHmacKey) > 0 {
formData := url.Values{}
for k, v := range payload {
formData.Add(k, v)
}
formString := formData.Encode()
var err error
hmacSignature, err = generateHmacSignature([]byte(formString), encryptedHmacKey)
if err != nil {
8000
log.Error().Err(err).Msg("Failed to generate HMAC signature")
}
}
req = client.R().SetFormData(payload)
body = payload
}
if hmacSignature != "" {
req.SetHeader("x-hmac-signature", hmacSignature)
}
resp, postErr := req.Post(myurl)
lastError = postErr
if postErr != nil {
log.Error().Err(postErr).Int("attempt", attempt+1).Str("url", myurl).Msg("Webhook failed due to network/IO error")
continue
}
if resp.StatusCode() < 200 || resp.StatusCode() >= 300 {
lastError = fmt.Errorf("unexpected status code: %d. Body: %s", resp.StatusCode(), string(resp.Body()))
log.Error().
Int("status", resp.StatusCode()).
Int("attempt", attempt+1).
Str("url", myurl).
Msg("Webhook failed due to non-2xx status code")
if !*webhookRetryEnabled {
break
}
continue
}
log.Info().Int("status", resp.StatusCode()).Str("url", myurl).Msg("Webhook call successful")
return
}
if lastError != nil {
log.Error().Str("url", myurl).Msg("Webhook permanently failed after all retries. Sending to error queue...")
errorPayloadMap := make(map[string]interface{})
if p, ok := body.(map[string]string); ok {
for k, v := range p {
errorPayloadMap[k] = v
}
} else if p, ok := body.(map[string]interface{}); ok {
errorPayloadMap = p
}
errorPayload := WebhookErrorPayload{
URL: myurl,
Payload: errorPayloadMap,
UserID: userID,
EncryptedHmacKey: hex.EncodeToString(encryptedHmacKey),
AttemptTime: time.Now(),
ErrorMessage: lastError.Error(),
}
PublishDataErrorToQueue(errorPayload)
}
}
// webhook for messages with file attachments
func callHookFile(myurl string, payload map[string]string, userID string, file string) error {
return callHookFileWithHmac(myurl, payload, userID, file, nil)
}
// webhook for messages with file attachments and HMAC
func callHookFileWithHmac(myurl string, payload map[string]string, userID string, file string, encryptedHmacKey []byte) error {
log.Info().Str("file", file).Str("url", myurl).Msg("Sending POST with retry logic")
client := clientManager.GetHTTPClient(userID)
maxRetries := 1
if *webhookRetryEnabled {
maxRetries = *webhookRetryCount
}
var lastError error
finalPayload := make(map[string]string)
for k, v := range payload {
finalPayload[k] = v
}
finalPayload["file"] = file
// 2. Loop Retry
for attempt := 0; attempt < maxRetries; attempt++ {
if attempt > 0 {
backoffFactor := 1 << uint(attempt-1)
delayDuration := time.Duration(*webhookRetryDelaySeconds) * time.Second * time.Duration(backoffFactor)
log.Warn().
Int("attempt", attempt+1).
Str("url", myurl).
Dur("delay", delayDuration).
Msg("Retrying file webhook request with exponential backoff...")
time.Sleep(delayDuration)
}
var hmacSignature string
var jsonPayload []byte
if len(encryptedHmacKey) > 0 {
var err error
jsonPayload, err = json.Marshal(finalPayload)
if err != nil {
log.Error().Err(err).Msg("Failed to marshal payload for HMAC")
} else {
hmacSignature, err = generateHmacSignature(jsonPayload, encryptedHmacKey)
if err != nil {
log.Error().Err(err).Msg("Failed to generate HMAC signature")
}
}
}
req := client.R().
SetFiles(map[string]string{
"file": file,
}).
SetFormData(finalPayload)
if hmacSignature != "" {
req.SetHeader("x-hmac-signature", hmacSignature)
}
resp, postErr := req.Post(myurl)
lastError = postErr
if postErr != nil {
log.Error().Err(postErr).Int("attempt", attempt+1).Str("url", myurl).Msg("File webhook failed due to network/IO error")
continue
}
if resp.StatusCode() < 200 || resp.StatusCode() >= 300 {
lastError = fmt.Errorf("unexpected status code: %d. Body: %s", resp.StatusCode(), string(resp.Body()))
log.Error().
Int("status", resp.StatusCode()).
Int("attempt", attempt+1).
Str("url", myurl).
Msg("File webhook failed due to non-2xx status code")
if !*webhookRetryEnabled {
break
}
continue
}
log.Info().Int("status", resp.StatusCode()).Str("url", myurl).Msg("File webhook call successful")
return nil
}
if lastError != nil {
log.Error().Str("url", myurl).Msg("File webhook permanently failed after all retries. Sending to error queue...")
errorPayloadMap := make(map[string]interface{})
for k, v := range finalPayload {
errorPayloadMap[k] = v
}
errorPayload := WebhookFileErrorPayload{
URL: myurl,
Payload: errorPayloadMap,
UserID: userID,
EncryptedHmacKey: hex.EncodeToString(encryptedHmacKey),
FilePath: file,
AttemptTime: time.Now(),
ErrorMessage: lastError.Error(),
}
PublishFileErrorToQueue(errorPayload)
return fmt.Errorf("webhook failed permanently: %w", lastError)
}
return nil
}
func (s *server) respondWithJSON(w http.ResponseWriter, statusCode int, payload interface{}) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
if err := enc.Encode(payload); err != nil {
log.Error().Err(err).Msg("Failed to encode JSON response")
http.Error(w, "internal server error", http.StatusInternalServerError)
return
}
w.WriteHeader(statusCode)
if _, err := w.Write(buf.Bytes()); err != nil {
log.Error().Err(err).Msg("Failed to write response body")
}
}
// ProcessOutgoingMedia handles media processing for outgoing messages with S3 support
func ProcessOutgoingMedia(userID string, contactJID string, messageID string, data []byte, mimeType string, fileName string, db *sqlx.DB) (map[string]interface{}, error) {
// Check if S3 is enabled for this user
var s3Config struct {
Enabled bool `db:"s3_enabled"`
MediaDelivery string `db:"media_delivery"`
}
err := db.Get(&s3Config, "SELECT s3_enabled, media_delivery FROM users WHERE id = $1", userID)
if err != nil {
log.Error().Err(err).Msg("Failed to get S3 config")
s3Config.Enabled = false
s3Config.MediaDelivery = "base64"
}
// Process S3 upload if enabled
if s3Config.Enabled && (s3Config.MediaDelivery == "s3" || s3Config.MediaDelivery == "both") {
// Process S3 upload (outgoing messages are always in outbox)
s3Data, err := GetS3Manager().ProcessMediaForS3(
context.Background(),
userID,
contactJID,
messageID,
data,
mimeType,
fileName,
false, // isIncoming = false for sent messages
)
if err != nil {
log.Error().Err(err).Msg("Failed to upload media to S3")
// Continue even if S3 upload fails
} else {
return s3Data, nil
}
}
return nil, nil
}
// generateHmacSignature generates HMAC-SHA256 signature for webhook payload
func generateHmacSignature(payload []byte, encryptedHmacKey []byte) (string, error) {
if len(encryptedHmacKey) == 0 {
return "", nil
}
// Decrypt HMAC key
hmacKey, err := decryptHMACKey(encryptedHmacKey)
if err != nil {
return "", fmt.Errorf("failed to decrypt HMAC key: %w", err)
}
// Generate HMAC
h := hmac.New(sha256.New, []byte(hmacKey))
h.Write(payload)
return hex.EncodeToString(h.Sum(nil)), nil
}
func encryptHMACKey(plainText string) ([]byte, error) {
if *globalEncryptionKey == "" {
return nil, fmt.Errorf("encryption key not configured")
}
block, err := aes.NewCipher([]byte(*globalEncryptionKey))
if err != nil {
return nil, fmt.Errorf("failed to create cipher: %w", err)
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, fmt.Errorf("failed to create GCM: %w", err)
}
nonce := make([]byte, gcm.NonceSize())
if _, err := io.ReadFull(rand.Reader, nonce); err != nil {
return nil, fmt.Errorf("failed to generate nonce: %w", err)
}
ciphertext := gcm.Seal(nonce, nonce, []byte(plainText), nil)
return ciphertext, nil
}
// decryptHMACKey decrypts HMAC key using AES-GCM
func decryptHMACKey(encryptedData []byte) (string, error) {
if *globalEncryptionKey == "" {
return "", fmt.Errorf("encryption key not configured")
}
block, err := aes.NewCipher([]byte(*globalEncryptionKey))
if err != nil {
return "", fmt.Errorf("failed to create cipher: %w", err)
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return "", fmt.Errorf("failed to create GCM: %w", err)
}
nonceSize := gcm.NonceSize()
if len(encryptedData) < nonceSize {
return "", fmt.Errorf("ciphertext too short")
}
nonce, ciphertext := encryptedData[:nonceSize], encryptedData[nonceSize:]
plaintext, err := gcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
return "", fmt.Errorf("failed to decrypt: %w", err)
}
return string(plaintext), nil
}
func extractFirstURL(text string) string {
match := urlRegex.FindString(text)
if match == "" {
return ""
}
return match
}
func fetchOpenGraphData(ctx context.Context, urlStr string) (string, string, []byte) {
pageData, _, err := fetchURLBytes(ctx, urlStr, openGraphPageMaxBytes)
if err != nil {
log.Warn().Err(err).Str("url", urlStr).Msg("Failed to fetch URL for Open Graph data")
return "", "", nil
}
doc, err := goquery.NewDocumentFromReader(bytes.NewReader(pageData))
if err != nil {
log.Warn().Err(err).Str("url", urlStr).Msg("Failed to parse HTML for Open Graph data")
return "", "", nil
}
title := doc.Find(`meta[property="og:title"]`).AttrOr("content", "")
if title == "" {
title = strings.TrimSpace(doc.Find("title").Text())
}
description := doc.Find(`meta[property="og:description"]`).AttrOr("content", "")
if description == "" {
description = doc.Find(`meta[name="description"]`).AttrOr("content", "")
}
var imageURLStr string
selectors := []struct {
selector string
attr string
}{
{`meta[property="og:image"]`, "content"},
{`meta[property="twitter:image"]`, "content"},
{`link[rel="apple-touch-icon"]`, "href"},
{`link[rel="icon"]`, "href"},
}
for _, s := range selectors {
imageURLStr, _ = doc.Find(s.selector).Attr(s.attr)
if imageURLStr != "" {
break
}
}
pageURL, err := url.Parse(urlStr)
if err != nil {
log.Warn().Err(err).Str("url", urlStr).Msg("Failed to parse page URL for resolving image URL")
return title, description, nil
}
imageData := fetchOpenGraphImage(ctx, pageURL, imageURLStr)
return title, description, imageData
}
func fetchOpenGraphImage(ctx context.Context, pageURL *url.URL, imageURLStr string) []byte {
imageURL, err := url.Parse(imageURLStr)
if err != nil {
log.Warn().Err(err).Str("imageURL", imageURLStr).Msg("Failed to parse Open Graph image URL")
return nil
}
resolvedImageURL := pageURL.ResolveReference(imageURL).String()
imgBytes, _, err := fetchURLBytes(ctx, resolvedImageURL, openGraphImageMaxBytes)
if err != nil {
log.Warn().Err(err).Str("imageURL", resolvedImageURL).Msg("Failed to fetch Open Graph image")
return nil
}
imgConfig, _, err := image.DecodeConfig(bytes.NewReader(imgBytes))
if err != nil {
log.Warn().Err(err).Str("imageURL", resolvedImageURL).Msg("Failed to decode Open Graph image config")
return nil
}
if imgConfig.Width > openGraphMaxImageDim || imgConfig.Height > openGraphMaxImageDim {
log.Warn().
Int("width", imgConfig.Width).
Int("height", imgConfig.Height).
Str("imageURL", resolvedImageURL).
Msg("Open Graph image dimensions too large")
return nil
}
img, _, err := image.Decode(bytes.NewReader(imgBytes))
if err != nil {
log.Warn().Err(err).Str("imageURL", resolvedImageURL).Msg("Failed to decode Open Graph image")
return nil
}
thumbnail := resize.Thumbnail(openGraphThumbnailWidth, openGraphThumbnailHeight, img, resize.Lanczos3)
var buf bytes.Buffer
if err := jpeg.Encode(&buf, thumbnail, &jpeg.Options{Quality: openGraphJpegQuality}); err != nil {
log.Warn().Err(err).Msg("Failed to encode thumbnail to JPEG")
return nil
}
return buf.Bytes()
}
func convertVideoStickerToWebP(input []byte) ([]byte, error) {
inFile, err := os.CreateTemp("", "sticker-input-*.mp4")
if err != nil {
return nil, err
}
defer os.Remove(inFile.Name())
defer inFile.Close()
if _, err := inFile.Write(input); err != nil {
return nil, err
}
outFile, err := os.CreateTemp("", "sticker-output-*.webp")
if err != nil {
return nil, err
}
outPath := outFile.Name()
outFile.Close()
defer os.Remove(outPath)
qValue := 10
filter := "fps=15,scale=512:512:force_original_aspect_ratio=increase,crop=512:512"
cmd := exec.Command(
"ffmpeg",
"-y",
"-t", "10",
"-i", inFile.Name(),
"-vf", filter,
"-loop", "0",
"-an",
"-vsync", "0",
"-fs", "1000000",
"-c:v", "libwebp",
"-qscale:v", fmt.Sprintf("%d", qValue),
outPath,
)
var stdout, stderr bytes.Buffer
cmd.Stdout = &stdout
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
log.Error().Err(err).Str("stderr", stderr.String()).Msg("ffmpeg failed converting video sticker")
return nil, err
}
data, err := os.ReadFile(outPath)
if err != nil {
return nil, err
}
return data, nil
}
func processStickerData(stickerData string, mimeOverride string, packID, packName, packPublisher string, emojis []string) ([]byte, string, error) {
if !strings.HasPrefix(stickerData, "data") {
return nil, "", fmt.Errorf("data should start with \"data:mime/type;base64,\"")
}
dataURL, err := dataurl.DecodeString(stickerData)
if err != nil {
return nil, "", fmt.Errorf("could not decode base64 encoded data from payload")
}
filedata := dataURL.Data
detectedMimeType := http.DetectContentType(filedata)
if mimeOverride != "" {
detectedMimeType = mimeOverride
}
// If this is a video sticker, convert to animated WebP
if strings.HasPrefix(detectedMimeType, "video/") {
converted, err := convertVideoStickerToWebP(filedata)
if err != nil {
return nil, "", fmt.Errorf("failed to convert video sticker to webp: %w", err)
}
filedata = converted
detectedMimeType = "image/webp"
}
// If we have sticker metadata and the content is WebP, embed EXIF metadata
if strings.HasPrefix(detectedMimeType, "image/webp") {
filedata = embedStickerEXIF(filedata, packID, packName, packPublisher, emojis)
}
return filedata, detectedMimeType, nil
}
// embedStickerEXIF injects WhatsApp sticker metadata into a WebP image.
func embedStickerEXIF(inputWebP []byte, packID, packName, packPublisher string, emojis []string) []byte {
if packID == "" && packName == "" && packPublisher == "" && len(emojis) == 0 {
return inputWebP
}
meta := map[string]interface{}{}
if packID != "" {
meta["sticker-pack-id"] = packID
}
if packName != "" {
meta["sticker-pack-name"] = packName
}
if packPublisher != "" {
meta["sticker-pack-publisher"] = packPublisher
}
if len(emojis) > 0 {
meta["emojis"] = emojis
}
jsonBytes, err := json.Marshal(meta)
if err != nil {
return inputWebP
}
starting := []byte{0x49, 0x49, 0x2A, 0x00, 0x08, 0x00, 0x00, 0x00, 0x01, 0x00, 0x41, 0x57, 0x07, 0x00}
811B
ending := []byte{0x16, 0x00, 0x00, 0x00}
var exifBuf bytes.Buffer
exifBuf.Write(starting)
lenBuf := make([]byte, 4)
binary.LittleEndian.PutUint32(lenBuf, uint32(len(jsonBytes)))
exifBuf.Write(lenBuf)
exifBuf.Write(ending)
exifBuf.Write(jsonBytes)
out, err := injectWebPExifChunk(inputWebP, exifBuf.Bytes())
if err != nil {
log.Warn().Err(err).Msg("failed to inject EXIF chunk; sending sticker without metadata")
return inputWebP
}
return out
}
// injectWebPExifChunk adds/replaces EXIF chunk and sets EXIF bit in VP8X if present.
func injectWebPExifChunk(in []byte, exif []byte) ([]byte, error) {
if len(in) < 12 || string(in[0:4]) != "RIFF" || string(in[8:12]) != "WEBP" {
return nil, fmt.Errorf("not a RIFF WEBP file")
}
var out bytes.Buffer
out.Grow(len(in) + len(exif) + 32)
out.WriteString("RIFF")
out.Write([]byte{0, 0, 0, 0})
out.WriteString("WEBP")
pos := 12
vp8xIndex := -1
var chunks [][]byte
for pos+8 <= len(in) {
tag := string(in[pos : pos+4])
size := int(binary.LittleEndian.Uint32(in[pos+4 : pos+8]))
dataStart := pos + 8
dataEnd := dataStart + size
if dataEnd > len(in) {
return nil, fmt.Errorf("truncated webp chunk: %s", tag)
}
pad := size & 1
next := dataEnd + pad
if tag == "VP8X" && size >= 10 {
vp8xIndex = len(chunks)
}
if tag != "EXIF" {
chunk := make([]byte, 8+size+pad)
copy(chunk[0:4], in[pos:pos+4])
binary.LittleEndian.PutUint32(chunk[4:8], uint32(size))
copy(chunk[8:8+size], in[dataStart:dataEnd])
if pad == 1 {
chunk[8+size] = 0
}
chunks = append(chunks, chunk)
}
pos = next
}
if vp8xIndex >= 0 {
c := chunks[vp8xIndex]
if len(c) >= 18 {
c[8] = c[8] | 0x04
chunks[vp8xIndex] = c
}
}
for _, c := range chunks {
out.Write(c)
}
exifSize := len(exif)
out.WriteString("EXIF")
sz := make([]byte, 4)
binary.LittleEndian.PutUint32(sz, uint32(exifSize))
out.Write(sz)
out.Write(exif)
if exifSize%2 == 1 {
out.WriteByte(0)
}
b := out.Bytes()
riffSize := uint32(len(b) - 8)
binary.LittleEndian.PutUint32(b[4:8], riffSize)
return b, nil
}