feat: support quoted message headers

server/store/store.go

@@ -3727,6 +3727,13 @@ func validateMessageHeaders(head types.KVMap) error {
 			return types.ErrMalformed
 		}
 	}
+	if rawReply, ok := head["x-im-reply"]; ok {
+		reply, err := normalizeIMReplyHeader(rawReply)
+		if err != nil {
+			return err
+		}
+		head["x-im-reply"] = reply
+	}
 	return nil
 }
 
@@ -3779,6 +3786,74 @@ func messageHeaderString(head types.KVMap, key string) (string, bool) {
 	return text, text != ""
 }
 
+func normalizeIMReplyHeader(value any) (map[string]any, error) {
+	var reply map[string]any
+	switch typed := value.(type) {
+	case map[string]any:
+		reply = typed
+	case types.KVMap:
+		reply = map[string]any(typed)
+	case string:
+		if strings.TrimSpace(typed) == "" {
+			return nil, types.ErrMalformed
+		}
+		if err := json.Unmarshal([]byte(typed), &reply); err != nil {
+			return nil, types.ErrMalformed
+		}
+	default:
+		return nil, types.ErrMalformed
+	}
+	if reply == nil || !validIMReplySeq(reply["seq"]) {
+		return nil, types.ErrMalformed
+	}
+	if text, ok := reply["type"].(string); !ok || strings.TrimSpace(text) == "" {
+		return nil, types.ErrMalformed
+	}
+	if text, ok := reply["text"].(string); !ok || strings.TrimSpace(text) == "" {
+		return nil, types.ErrMalformed
+	}
+	if from, ok := reply["from"]; ok {
+		if text, ok := from.(string); !ok || strings.TrimSpace(text) == "" {
+			return nil, types.ErrMalformed
+		}
+	}
+	return reply, nil
+}
+
+func validIMReplySeq(value any) bool {
+	switch typed := value.(type) {
+	case json.Number:
+		_, err := typed.Int64()
+		return err == nil
+	case float64:
+		return typed > 0 && typed == float64(int64(typed))
+	case float32:
+		return typed > 0 && typed == float32(int64(typed))
+	case int:
+		return typed > 0
+	case int8:
+		return typed > 0
+	case int16:
+		return typed > 0
+	case int32:
+		return typed > 0
+	case int64:
+		return typed > 0
+	case uint:
+		return typed > 0
+	case uint8:
+		return typed > 0
+	case uint16:
+		return typed > 0
+	case uint32:
+		return typed > 0
+	case uint64:
+		return typed > 0
+	default:
+		return false
+	}
+}
+
 func validIMMessageHeaderToken(value string, max int) bool {
 	value = strings.TrimSpace(value)
 	if value == "" || len(value) > max {