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Backend/.gitignore

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+QuestionService/.env
+user-service/.env
+MatchingService/.env
+HistoryService/.env
+QuestionService/insert_questions_script.py
+
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+QuestionService/node_modules
+user-service/node_modules
+MatchingService/node_modules
+CollabService/node_modules
+HistoryService/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*

Backend/CollabService/Dockerfile

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+FROM node:18-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+
+EXPOSE 3004
+EXPOSE 1234
+
+CMD ["npm", "start"]

Backend/CollabService/app.js

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+const express = require('express');
+const http = require('http');
+const { setupWebSocket } = require('./websocket/roomManagerSocket');
+const { setUpYjsSocket } = require('./websocket/collabSocket');
+const app = express();
+
+const server = http.createServer(app);
+
+// Set up Yjs server 
+setUpYjsSocket();
+
+// Set up WebSocket server and attach to HTTP server
+setupWebSocket(server);
+
+
+// Basic route to test the server
+app.get('/', (req, res) => {
+    res.send('CollabService using Yjs is running');
+});
+
+
+
+module.exports = { server };

Backend/CollabService/index.js

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+const { server } = require('./app')
+
+// Change the port number to listen to a different port but remember to change the port number in frontend too!
+server.listen(3004, () => {
+    console.log("Collab Service is Running on port 3004")
+})