audit full project flows and harden backend

backend/iot-server/internal/service/service.go

@@ -32,6 +32,7 @@ type Service struct {
 	packet atomic.Uint32
 	http   *http.Server
 	ready  atomic.Bool
+	client *http.Client
 }
 type Command struct {
 	Identity       string    `json:"identity"`
@@ -97,7 +98,7 @@ func New(cfg config.Config) (*Service, error) {
 	if err = broker.AddListener(listeners.NewTCP(listenerConfig)); err != nil {
 		return nil, fmt.Errorf("配置 MQTT 监听器: %w", err)
 	}
-	return &Service{cfg: cfg, keys: keys, broker: broker}, nil
+	return &Service{cfg: cfg, keys: keys, broker: broker, client: &http.Client{Timeout: 12 * time.Second}}, nil
 }
 
 func makeTLSConfig(cfg config.Config) (*tls.Config, error) {
@@ -222,10 +223,14 @@ func (s *Service) command(w http.ResponseWriter, r *http.Request) {
 
 func (s *Service) onMessage(_ *mqtt.Client, _ packets.Subscription, message packets.Packet) {
 	raw := append([]byte(nil), message.Payload...)
-	envelope := Envelope{Type: "device_message", Topic: message.TopicName, ReceivedAt: time.Now().UTC().Format(time.RFC3339Nano), PayloadHex: hex.EncodeToString(raw)}
+	expectedDeviceID, topicOK := deviceIDFromTopic(s.cfg, message.TopicName)
+	envelope := Envelope{Type: "device_message", Topic: message.TopicName, DeviceID: expectedDeviceID, ReceivedAt: time.Now().UTC().Format(time.RFC3339Nano), PayloadHex: hex.EncodeToString(raw)}
 	if frame, err := protocol.Decode(raw, s.keys); err == nil {
 		deviceID := hex.EncodeToString(frame.DeviceID[:])
-		envelope.DeviceID = deviceID
+		if !topicOK || deviceID != expectedDeviceID {
+			s.forwardEnvelope(envelope)
+			return
+		}
 		main := byte(0)
 		if len(frame.Payload) > 0 {
 			main = frame.Payload[0]
@@ -238,6 +243,10 @@ func (s *Service) onMessage(_ *mqtt.Client, _ packets.Subscription, message pack
 		}
 		envelope.Frame = decoded
 	}
+	s.forwardEnvelope(envelope)
+}
+
+func (s *Service) forwardEnvelope(envelope Envelope) {
 	data, _ := json.Marshal(envelope)
 	request, err := http.NewRequest(http.MethodPost, s.cfg.HTTP.CallbackURL, bytes.NewReader(data))
 	if err != nil {
@@ -245,12 +254,38 @@ func (s *Service) onMessage(_ *mqtt.Client, _ packets.Subscription, message pack
 	}
 	request.Header.Set("Content-Type", "application/json")
 	request.Header.Set("X-Heqi-Iot-Token", s.cfg.HTTP.InternalToken)
-	response, err := http.DefaultClient.Do(request)
+	response, err := s.client.Do(request)
 	if err == nil {
 		_ = response.Body.Close()
 	}
 }
 
+func deviceIDFromTopic(cfg config.Config, topic string) (string, bool) {
+	for _, pattern := range []string{cfg.MQTT.UpTopic, cfg.MQTT.AckTopic} {
+		parts := strings.Split(pattern, "/")
+		values := strings.Split(topic, "/")
+		if len(parts) != len(values) {
+			continue
+		}
+		deviceID := ""
+		matched := true
+		for index := range parts {
+			if parts[index] == "+" {
+				deviceID = values[index]
+				continue
+			}
+			if parts[index] != values[index] {
+				matched = false
+				break
+			}
+		}
+		if matched && len(deviceID) == 16 {
+			return strings.ToLower(deviceID), true
+		}
+	}
+	return "", false
+}
+
 func decodeDeviceID(value string) ([8]byte, error) {
 	var result [8]byte
 	decoded, err := hex.DecodeString(value)