feat: add Facebook Messenger channel
Implement webhook-based Messenger channel following the LINE channel pattern. Includes webhook verification, HMAC-SHA256 signature validation, message processing, and Graph API message sending. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
pkonowrocki
parent
3bdbf33cf3
commit
720fae6aec
4 changed files with 590 additions and 10 deletions
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@ -176,6 +176,19 @@ func (m *Manager) initChannels() error {
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}
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}
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if m.config.Channels.Messenger.Enabled && m.config.Channels.Messenger.PageAccessToken != "" {
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logger.DebugC("channels", "Attempting to initialize Messenger channel")
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messenger, err := NewMessengerChannel(m.config.Channels.Messenger, m.bus)
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if err != nil {
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logger.ErrorCF("channels", "Failed to initialize Messenger channel", map[string]interface{}{
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"error": err.Error(),
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})
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} else {
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m.channels["messenger"] = messenger
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logger.InfoC("channels", "Messenger channel enabled successfully")
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}
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}
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logger.InfoCF("channels", "Channel initialization completed", map[string]interface{}{
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"enabled_channels": len(m.channels),
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})
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331
pkg/channels/messenger.go
Normal file
331
pkg/channels/messenger.go
Normal file
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@ -0,0 +1,331 @@
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package channels
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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/hex"
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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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"strings"
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"time"
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"github.com/sipeed/picoclaw/pkg/bus"
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"github.com/sipeed/picoclaw/pkg/config"
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"github.com/sipeed/picoclaw/pkg/logger"
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"github.com/sipeed/picoclaw/pkg/utils"
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)
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const (
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messengerGraphAPIBase = "https://graph.facebook.com/v21.0"
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messengerMessagesAPI = messengerGraphAPIBase + "/me/messages"
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)
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// MessengerChannel implements the Channel interface for Facebook Messenger
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// using the Meta Webhook API for receiving messages and the Graph API for
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// sending replies.
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type MessengerChannel struct {
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*BaseChannel
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config config.MessengerConfig
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httpServer *http.Server
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ctx context.Context
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cancel context.CancelFunc
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}
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// NewMessengerChannel creates a new Messenger channel instance.
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func NewMessengerChannel(cfg config.MessengerConfig, messageBus *bus.MessageBus) (*MessengerChannel, error) {
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if cfg.PageAccessToken == "" || cfg.AppSecret == "" {
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return nil, fmt.Errorf("messenger page_access_token and app_secret are required")
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}
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base := NewBaseChannel("messenger", cfg, messageBus, cfg.AllowFrom)
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return &MessengerChannel{
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BaseChannel: base,
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config: cfg,
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}, nil
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}
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// Start launches the HTTP webhook server for Messenger.
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func (c *MessengerChannel) Start(ctx context.Context) error {
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logger.InfoC("messenger", "Starting Messenger channel (Webhook Mode)")
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c.ctx, c.cancel = context.WithCancel(ctx)
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mux := http.NewServeMux()
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path := c.config.WebhookPath
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if path == "" {
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path = "/messenger/webhook"
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}
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mux.HandleFunc(path, c.webhookHandler)
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port := c.config.WebhookPort
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if port == 0 {
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port = 18791
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}
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addr := fmt.Sprintf("0.0.0.0:%d", port)
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c.httpServer = &http.Server{
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Addr: addr,
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Handler: mux,
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}
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go func() {
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logger.InfoCF("messenger", "Messenger webhook server listening", map[string]interface{}{
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"addr": addr,
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"path": path,
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})
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if err := c.httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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logger.ErrorCF("messenger", "Webhook server error", map[string]interface{}{
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"error": err.Error(),
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})
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}
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}()
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c.setRunning(true)
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logger.InfoC("messenger", "Messenger channel started (Webhook Mode)")
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return nil
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}
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// Stop gracefully shuts down the HTTP server.
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func (c *MessengerChannel) Stop(ctx context.Context) error {
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logger.InfoC("messenger", "Stopping Messenger channel")
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if c.cancel != nil {
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c.cancel()
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}
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if c.httpServer != nil {
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shutdownCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
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defer cancel()
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if err := c.httpServer.Shutdown(shutdownCtx); err != nil {
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logger.ErrorCF("messenger", "Webhook server shutdown error", map[string]interface{}{
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"error": err.Error(),
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})
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}
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}
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c.setRunning(false)
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logger.InfoC("messenger", "Messenger channel stopped")
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return nil
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}
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// webhookHandler handles incoming Messenger webhook requests.
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// GET requests handle webhook verification; POST requests handle incoming messages.
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func (c *MessengerChannel) webhookHandler(w http.ResponseWriter, r *http.Request) {
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switch r.Method {
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case http.MethodGet:
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c.handleVerification(w, r)
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case http.MethodPost:
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c.handleIncoming(w, r)
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default:
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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}
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}
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// handleVerification responds to the Meta webhook verification challenge.
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func (c *MessengerChannel) handleVerification(w http.ResponseWriter, r *http.Request) {
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mode := r.URL.Query().Get("hub.mode")
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token := r.URL.Query().Get("hub.verify_token")
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challenge := r.URL.Query().Get("hub.challenge")
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if mode == "subscribe" && token == c.config.VerifyToken {
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logger.InfoC("messenger", "Webhook verification successful")
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w.WriteHeader(http.StatusOK)
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w.Write([]byte(challenge))
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return
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}
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logger.WarnC("messenger", "Webhook verification failed")
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http.Error(w, "Forbidden", http.StatusForbidden)
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}
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// handleIncoming processes incoming webhook POST requests.
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func (c *MessengerChannel) handleIncoming(w http.ResponseWriter, r *http.Request) {
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body, err := io.ReadAll(r.Body)
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if err != nil {
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logger.ErrorCF("messenger", "Failed to read request body", map[string]interface{}{
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"error": err.Error(),
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})
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http.Error(w, "Bad request", http.StatusBadRequest)
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return
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}
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// Verify signature
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signature := r.Header.Get("X-Hub-Signature-256")
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if !c.verifySignature(body, signature) {
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logger.WarnC("messenger", "Invalid webhook signature")
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http.Error(w, "Forbidden", http.StatusForbidden)
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return
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}
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var payload messengerWebhookPayload
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if err := json.Unmarshal(body, &payload); err != nil {
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logger.ErrorCF("messenger", "Failed to parse webhook payload", map[string]interface{}{
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"error": err.Error(),
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})
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http.Error(w, "Bad request", http.StatusBadRequest)
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return
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}
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// Return 200 immediately, process events asynchronously
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w.WriteHeader(http.StatusOK)
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w.Write([]byte("EVENT_RECEIVED"))
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for _, entry := range payload.Entry {
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for _, event := range entry.Messaging {
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go c.processEvent(event)
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}
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}
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}
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// verifySignature validates the X-Hub-Signature-256 using HMAC-SHA256.
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func (c *MessengerChannel) verifySignature(body []byte, signature string) bool {
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if signature == "" {
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return false
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}
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// Signature format: "sha256=<hex>"
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prefix := "sha256="
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if !strings.HasPrefix(signature, prefix) {
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return false
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}
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sigHex := signature[len(prefix):]
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mac := hmac.New(sha256.New, []byte(c.config.AppSecret))
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mac.Write(body)
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expected := hex.EncodeToString(mac.Sum(nil))
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return hmac.Equal([]byte(expected), []byte(sigHex))
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}
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// Messenger webhook payload types
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type messengerWebhookPayload struct {
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Object string `json:"object"`
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Entry []messengerWebhookEntry `json:"entry"`
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}
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type messengerWebhookEntry struct {
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ID string `json:"id"`
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Time int64 `json:"time"`
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Messaging []messengerMessagingEvent `json:"messaging"`
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}
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type messengerMessagingEvent struct {
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Sender messengerUser `json:"sender"`
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Recipient messengerUser `json:"recipient"`
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Timestamp int64 `json:"timestamp"`
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Message *messengerMsg `json:"message,omitempty"`
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}
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type messengerUser struct {
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ID string `json:"id"`
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}
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type messengerMsg struct {
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MID string `json:"mid"`
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Text string `json:"text"`
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Attachments []messengerAttachment `json:"attachments,omitempty"`
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}
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type messengerAttachment struct {
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Type string `json:"type"`
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Payload messengerAttachmentPayload `json:"payload"`
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}
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type messengerAttachmentPayload struct {
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URL string `json:"url"`
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}
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func (c *MessengerChannel) processEvent(event messengerMessagingEvent) {
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// Only process message events
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if event.Message == nil {
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logger.DebugCF("messenger", "Ignoring non-message event", map[string]interface{}{
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"sender": event.Sender.ID,
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})
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return
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}
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senderID := event.Sender.ID
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chatID := senderID // Messenger conversations are 1:1 with sender
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var content string
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if event.Message.Text != "" {
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content = event.Message.Text
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} else if len(event.Message.Attachments) > 0 {
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// Log attachments but skip for now
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for _, att := range event.Message.Attachments {
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logger.InfoCF("messenger", "Received attachment (skipping)", map[string]interface{}{
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"type": att.Type,
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"url": att.Payload.URL,
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})
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}
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content = fmt.Sprintf("[%s attachment]", event.Message.Attachments[0].Type)
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}
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if strings.TrimSpace(content) == "" {
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return
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}
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metadata := map[string]string{
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"platform": "messenger",
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"message_id": event.Message.MID,
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}
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logger.DebugCF("messenger", "Received message", map[string]interface{}{
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"sender_id": senderID,
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"chat_id": chatID,
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"preview": utils.Truncate(content, 50),
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})
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c.HandleMessage(senderID, chatID, content, nil, metadata)
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}
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// Send sends a message to a Messenger user via the Graph API.
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func (c *MessengerChannel) Send(ctx context.Context, msg bus.OutboundMessage) error {
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if !c.IsRunning() {
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return fmt.Errorf("messenger channel not running")
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}
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payload := map[string]interface{}{
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"recipient": map[string]string{
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"id": msg.ChatID,
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},
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"message": map[string]string{
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"text": msg.Content,
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},
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}
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body, err := json.Marshal(payload)
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if err != nil {
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return fmt.Errorf("failed to marshal payload: %w", err)
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}
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url := messengerMessagesAPI + "?access_token=" + c.config.PageAccessToken
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewReader(body))
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if err != nil {
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return fmt.Errorf("failed to create request: %w", err)
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}
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req.Header.Set("Content-Type", "application/json")
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client := &http.Client{Timeout: 30 * time.Second}
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resp, err := client.Do(req)
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if err != nil {
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return fmt.Errorf("Graph API request failed: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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respBody, _ := io.ReadAll(resp.Body)
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return fmt.Errorf("Messenger Graph API error (status %d): %s", resp.StatusCode, string(respBody))
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}
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logger.DebugCF("messenger", "Message sent", map[string]interface{}{
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"chat_id": msg.ChatID,
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})
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return nil
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}
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216
pkg/channels/messenger_test.go
Normal file
216
pkg/channels/messenger_test.go
Normal file
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@ -0,0 +1,216 @@
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package channels
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"io"
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"net/http"
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"net/http/httptest"
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"strings"
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"testing"
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"github.com/sipeed/picoclaw/pkg/bus"
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"github.com/sipeed/picoclaw/pkg/config"
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)
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func newTestMessengerChannel(t *testing.T) *MessengerChannel {
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t.Helper()
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cfg := config.MessengerConfig{
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Enabled: true,
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PageAccessToken: "test-page-token",
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VerifyToken: "test-verify-token",
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AppSecret: "test-app-secret",
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WebhookPort: 0,
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WebhookPath: "/messenger/webhook",
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}
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msgBus := bus.NewMessageBus()
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ch, err := NewMessengerChannel(cfg, msgBus)
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if err != nil {
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t.Fatalf("NewMessengerChannel: %v", err)
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}
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return ch
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}
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func computeSignature(secret, body string) string {
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mac := hmac.New(sha256.New, []byte(secret))
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mac.Write([]byte(body))
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return "sha256=" + hex.EncodeToString(mac.Sum(nil))
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}
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func TestMessengerVerifySignature(t *testing.T) {
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ch := newTestMessengerChannel(t)
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tests := []struct {
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name string
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body string
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signature string
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want bool
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}{
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{
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name: "valid signature",
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body: `{"object":"page"}`,
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signature: computeSignature("test-app-secret", `{"object":"page"}`),
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want: true,
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},
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{
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name: "invalid signature",
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body: `{"object":"page"}`,
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signature: "sha256=0000000000000000000000000000000000000000000000000000000000000000",
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want: false,
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},
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{
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name: "empty signature",
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body: `{"object":"page"}`,
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signature: "",
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want: false,
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},
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{
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name: "missing sha256 prefix",
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body: `{"object":"page"}`,
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signature: "deadbeef",
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want: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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got := ch.verifySignature([]byte(tt.body), tt.signature)
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if got != tt.want {
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t.Errorf("verifySignature() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestMessengerWebhookVerification(t *testing.T) {
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ch := newTestMessengerChannel(t)
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tests := []struct {
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name string
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query string
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wantStatus int
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wantBody string
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}{
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{
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name: "valid verification",
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query: "hub.mode=subscribe&hub.verify_token=test-verify-token&hub.challenge=challenge123",
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wantStatus: http.StatusOK,
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wantBody: "challenge123",
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},
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{
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name: "wrong verify token",
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query: "hub.mode=subscribe&hub.verify_token=wrong-token&hub.challenge=challenge123",
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wantStatus: http.StatusForbidden,
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},
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{
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name: "wrong mode",
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query: "hub.mode=unsubscribe&hub.verify_token=test-verify-token&hub.challenge=challenge123",
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wantStatus: http.StatusForbidden,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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req := httptest.NewRequest(http.MethodGet, "/messenger/webhook?"+tt.query, nil)
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w := httptest.NewRecorder()
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ch.webhookHandler(w, req)
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resp := w.Result()
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if resp.StatusCode != tt.wantStatus {
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t.Errorf("status = %d, want %d", resp.StatusCode, tt.wantStatus)
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}
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if tt.wantBody != "" {
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body, _ := io.ReadAll(resp.Body)
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if strings.TrimSpace(string(body)) != tt.wantBody {
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t.Errorf("body = %q, want %q", string(body), tt.wantBody)
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}
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}
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})
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}
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}
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func TestMessengerMessageParsing(t *testing.T) {
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ch := newTestMessengerChannel(t)
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payload := messengerWebhookPayload{
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Object: "page",
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Entry: []messengerWebhookEntry{
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{
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ID: "page123",
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Time: 1234567890,
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Messaging: []messengerMessagingEvent{
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{
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Sender: messengerUser{ID: "user456"},
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Recipient: messengerUser{ID: "page123"},
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Timestamp: 1234567890,
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Message: &messengerMsg{
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MID: "mid.123",
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Text: "Hello, bot!",
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||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
body, err := json.Marshal(payload)
|
||||
if err != nil {
|
||||
t.Fatalf("marshal: %v", err)
|
||||
}
|
||||
|
||||
signature := computeSignature("test-app-secret", string(body))
|
||||
|
||||
req := httptest.NewRequest(http.MethodPost, "/messenger/webhook", strings.NewReader(string(body)))
|
||||
req.Header.Set("X-Hub-Signature-256", signature)
|
||||
w := httptest.NewRecorder()
|
||||
|
||||
ch.webhookHandler(w, req)
|
||||
|
||||
resp := w.Result()
|
||||
if resp.StatusCode != http.StatusOK {
|
||||
t.Errorf("status = %d, want %d", resp.StatusCode, http.StatusOK)
|
||||
}
|
||||
|
||||
respBody, _ := io.ReadAll(resp.Body)
|
||||
if strings.TrimSpace(string(respBody)) != "EVENT_RECEIVED" {
|
||||
t.Errorf("body = %q, want %q", string(respBody), "EVENT_RECEIVED")
|
||||
}
|
||||
}
|
||||
|
||||
func TestMessengerRejectsInvalidSignature(t *testing.T) {
|
||||
ch := newTestMessengerChannel(t)
|
||||
|
||||
body := `{"object":"page","entry":[]}`
|
||||
req := httptest.NewRequest(http.MethodPost, "/messenger/webhook", strings.NewReader(body))
|
||||
req.Header.Set("X-Hub-Signature-256", "sha256=invalid")
|
||||
w := httptest.NewRecorder()
|
||||
|
||||
ch.webhookHandler(w, req)
|
||||
|
||||
resp := w.Result()
|
||||
if resp.StatusCode != http.StatusForbidden {
|
||||
t.Errorf("status = %d, want %d", resp.StatusCode, http.StatusForbidden)
|
||||
}
|
||||
}
|
||||
|
||||
func TestNewMessengerChannelRequiresCredentials(t *testing.T) {
|
||||
msgBus := bus.NewMessageBus()
|
||||
|
||||
_, err := NewMessengerChannel(config.MessengerConfig{
|
||||
Enabled: true,
|
||||
}, msgBus)
|
||||
if err == nil {
|
||||
t.Error("expected error for missing credentials")
|
||||
}
|
||||
|
||||
_, err = NewMessengerChannel(config.MessengerConfig{
|
||||
Enabled: true,
|
||||
PageAccessToken: "token",
|
||||
AppSecret: "secret",
|
||||
}, msgBus)
|
||||
if err != nil {
|
||||
t.Errorf("unexpected error: %v", err)
|
||||
}
|
||||
}
|
||||
|
|
@ -86,6 +86,7 @@ type ChannelsConfig struct {
|
|||
Slack SlackConfig `json:"slack"`
|
||||
LINE LINEConfig `json:"line"`
|
||||
OneBot OneBotConfig `json:"onebot"`
|
||||
Messenger MessengerConfig `json:"messenger"`
|
||||
}
|
||||
|
||||
type WhatsAppConfig struct {
|
||||
|
|
@ -163,6 +164,16 @@ type OneBotConfig struct {
|
|||
AllowFrom FlexibleStringSlice `json:"allow_from" env:"PICOCLAW_CHANNELS_ONEBOT_ALLOW_FROM"`
|
||||
}
|
||||
|
||||
type MessengerConfig struct {
|
||||
Enabled bool `json:"enabled" env:"PICOCLAW_CHANNELS_MESSENGER_ENABLED"`
|
||||
PageAccessToken string `json:"page_access_token" env:"PICOCLAW_CHANNELS_MESSENGER_PAGE_ACCESS_TOKEN"`
|
||||
VerifyToken string `json:"verify_token" env:"PICOCLAW_CHANNELS_MESSENGER_VERIFY_TOKEN"`
|
||||
AppSecret string `json:"app_secret" env:"PICOCLAW_CHANNELS_MESSENGER_APP_SECRET"`
|
||||
WebhookPort int `json:"webhook_port" env:"PICOCLAW_CHANNELS_MESSENGER_WEBHOOK_PORT"`
|
||||
WebhookPath string `json:"webhook_path" env:"PICOCLAW_CHANNELS_MESSENGER_WEBHOOK_PATH"`
|
||||
AllowFrom FlexibleStringSlice `json:"allow_from" env:"PICOCLAW_CHANNELS_MESSENGER_ALLOW_FROM"`
|
||||
}
|
||||
|
||||
type HeartbeatConfig struct {
|
||||
Enabled bool `json:"enabled" env:"PICOCLAW_HEARTBEAT_ENABLED"`
|
||||
Interval int `json:"interval" env:"PICOCLAW_HEARTBEAT_INTERVAL"` // minutes, min 5
|
||||
|
|
@ -306,6 +317,15 @@ func DefaultConfig() *Config {
|
|||
GroupTriggerPrefix: []string{},
|
||||
AllowFrom: FlexibleStringSlice{},
|
||||
},
|
||||
Messenger: MessengerConfig{
|
||||
Enabled: false,
|
||||
PageAccessToken: "",
|
||||
VerifyToken: "",
|
||||
AppSecret: "",
|
||||
WebhookPort: 18791,
|
||||
WebhookPath: "/messenger/webhook",
|
||||
AllowFrom: FlexibleStringSlice{},
|
||||
},
|
||||
},
|
||||
Providers: ProvidersConfig{
|
||||
Anthropic: ProviderConfig{},
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue