reject join if meeting not generated or duplicate user

api-server/chat.py

@@ -38,15 +38,9 @@ def handle_join(data):
             return
         meeting_id = data['meeting_id']
         username = data['username']
-        if meeting_id not in session_storage:
-            emit('error', 'Invalid meeting ID', room=meeting_id)
-            return
+        join_room(meeting_id)
         session = session_storage[meeting_id]
-        if username in session_storage[meeting_id]['users']:
-            emit('error', 'User already joined', room=meeting_id)
-            return
         session['users'].append(username)
-        join_room(meeting_id)
         log_message('INFO', f'User {username} joined the meeting', meeting_id)
         emit('user_joined', {'username': username, 'meeting_id': meeting_id}, room=meeting_id)
 

client/src/pages/HomePage.js

@@ -15,11 +15,24 @@ const HomePage = () => {
       toast.error('Please enter a username before joining a meeting.');
       return;
     }
-    if (meetCode.trim()) {
-      navigate(`/meet/${meetCode}`, { state: { username } });
-    } else {
+    if (!meetCode.trim()) {
       toast.error('Please enter a meeting code.');
+      return;
     }
+
+    fetch(`${apiUrl}/api/session/${meetCode}`).then((response) => {
+      if (!response.ok) {
+        toast.error('Meeting code not found. Please try again.');
+        return;
+      }
+      return response.json();
+    }).then((data) => {
+      if (data.users.includes(username)) {
+        toast.error(`User ${username} is already in this meeting.`);
+        return;
+      }
+      navigate(`/meet/${meetCode}`, { state: { username } });
+    });
   };
 
   const handleCreateMeet = async () => {

client/src/pages/MeetingPage.js

@@ -52,11 +52,6 @@ const MeetingPage = () => {
       setMessages((prevMessages) => [...prevMessages, msg]);
     });
 
-    newSocket.on('error', (error) => {
-      toast.error(error);
-      navigate('/');
-    });
-
     return () => newSocket.close();
   }, [meeting_id, username, navigate]);