added shadcn ui, ParticipantsBar.tsx, get conversation members api

server/db/db.js

@@ -722,6 +722,35 @@ async function deleteMessage(user_id, message_id) {
   }
 }
 
+async function getMembers(conversation_id) {
+  const query = `
+    SELECT 
+      a.user_id,
+      a.username
+    FROM Memberships m
+    JOIN Accounts a ON m.user_id = a.user_id
+    WHERE m.conversation_id = $1;
+  `;
+
+  try {
+    const result = await client.query(query, [conversation_id]);
+    const members = result.rows;
+    if (members.length > 0) {
+      console.log(`Members of conversation_id ${conversation_id}:`, members);
+      return members;
+    } else {
+      console.log(`No members found for conversation_id ${conversation_id}.`);
+      return [];
+    }
+  } catch (e) {
+    console.error(
+      `Failed to get members for conversation_id ${conversation_id}`,
+      e,
+    );
+    return null;
+  }
+}
+
 function getTime() {
   return new Date();
 }
@@ -746,4 +775,5 @@ module.exports = {
   getConversationsForUser,
   contactSuggestion,
   deleteMessage,
+  getMembers,
 };

server/server.js

@@ -44,6 +44,7 @@ const {
   addMemberToGroupByUsername,
   contactSuggestion,
   deleteMessage,
+  getMembers,
 } = require("./db/db");
 const { extname } = require("node:path");
 
@@ -388,6 +389,26 @@ app.delete(
   },
 );
 
+app.get(
+  "/api/chat/groups/getMembers/:conversation_id",
+  authorizeUser,
+  async (req, res) => {
+    const conversation_id = req.params.conversation_id;
+    if (!conversation_id) {
+      return res.status(400).json({ message: "No conversation_id provided" });
+    }
+    const participants = await getMembers(conversation_id);
+    console.log(
+      `getMemers for conversation: ${conversation_id}, participants: ${participants} `,
+    );
+    if (participants) {
+      return res.status(200).json(participants);
+    } else {
+      return res.status(500).json({ message: "Failed to get group members" });
+    }
+  },
+);
+
 initializeSocket(io);
 
 server.listen(PORT, () => {