fix(chat): 修复多个聊天错误 消息格式错误导致断连、新消息会通知到发件人、加强消息发送的成员验证

core/routers/chat/services.py

@@ -11,12 +11,10 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import aliased, selectinload
 
 from core.base.exceptions import WebsocketTooManyRequests
-from core.db.models import User, Chat, ReadStatus, Message
+from core.db.models import User, Chat, ReadStatus, Message, chat_participant
 from core.routers.auth.schema import LoginUser
 from core.utils.helper import format_date
 
-from .schema import ChatUnreadOut
-
 
 async def websocket_callback(ws, pexpire):
     raise WebsocketTooManyRequests("Too many requests")
@@ -91,3 +89,22 @@ async def get_unread_messages_per_chat(
         ))
 
     return results
+
+
+async def get_chat(chat_guid, login_user: User, db_session: AsyncSession) -> Chat | None:
+    subquery = (
+        select(chat_participant.c.chat_id)
+        .where(chat_participant.c.user_id == login_user.user_id)
+    ).scalar_subquery()
+
+    query = (
+        select(Chat)
+        .where(and_(
+            Chat.id.in_(subquery),
+            Chat.guid == chat_guid,
+            Chat.is_deleted == False
+        ))
+    )
+    result = await db_session.execute(query)
+    await db_session.commit()
+    return result.scalar_one_or_none()