feat(privacy): add private-message permission toggle

app/messages/service.py

@@ -11,6 +11,7 @@ from app.messages.spam_guard import enforce_message_spam_policy
 from app.messages.schemas import MessageCreateRequest, MessageForwardRequest, MessageStatusUpdateRequest, MessageUpdateRequest
 from app.notifications.service import dispatch_message_notifications
 from app.users.repository import has_block_relation_between_users
+from app.users.service import get_user_by_id
 
 
 async def create_chat_message(db: AsyncSession, *, sender_id: int, payload: MessageCreateRequest) -> Message:
@@ -27,6 +28,10 @@ async def create_chat_message(db: AsyncSession, *, sender_id: int, payload: Mess
         counterpart_id = await chats_repository.get_private_counterpart_user_id(db, chat_id=payload.chat_id, user_id=sender_id)
         if counterpart_id and await has_block_relation_between_users(db, user_a_id=sender_id, user_b_id=counterpart_id):
             raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Cannot send message due to block settings")
+        if counterpart_id:
+            counterpart = await get_user_by_id(db, counterpart_id)
+            if counterpart and not counterpart.allow_private_messages:
+                raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="User does not accept private messages")
     if payload.reply_to_message_id is not None:
         reply_to = await repository.get_message_by_id(db, payload.reply_to_message_id)
         if not reply_to or reply_to.chat_id != payload.chat_id: