feat: adding single sign-in option(google & github)

Author: indrasuthar07

backend/.env.example

@@ -0,0 +1,11 @@
+MONGO_URI = mongodb://localhost:27017/PeerCall
+PORT = 3000
+JWT_SECRET = secret12peercall
+FRONTEND_URL = http://localhost:5173
+
+GITHUB_CLIENT_ID = put yours
+GITHUB_CLIENT_SECRET put yours
+GOOGLE_CLIENT_ID =  put yours
+GOOGLE_CLIENT_SECRET = put yours
+GOOGLE_CALLBACK_URL = http://localhost:3000/api/auth/google/callback
+GITHUB_CALLBACK_URL = http://localhost:3000/api/auth/github/callback    

backend/package-lock.json

@@ -19,6 +19,9 @@
     "jsonwebtoken": "^9.0.2",
     "mongodb": "^6.20.0",
     "mongoose": "^8.19.2",
+    "passport": "^0.7.0",
+    "passport-github2": "^0.1.12",
+    "passport-google-oauth20": "^2.0.0",
     "socket.io": "^4.8.1",
     "zod": "^4.1.12"
   },
@@ -27,10 +30,13 @@
     "@types/express": "^5.0.3",
     "@types/jsonwebtoken": "^9.0.10",
     "@types/node": "^24.9.1",
+    "@types/passport": "^1.0.17",
+    "@types/passport-github2": "^1.2.9",
+    "@types/passport-google-oauth20": "^2.0.16",
     "@types/socket.io": "^3.0.1",
     "nodemon": "^3.1.10",
     "ts-node": "^10.9.2",
     "ts-node-dev": "^2.0.0",
     "typescript": "^5.9.3"
   }
-}
+}

backend/package.json

@@ -4,12 +4,22 @@ import authRoutes from "./routes/authRoutes.js";
 import healthRoutes from "./routes/healthRoutes.js";
 import { errorHandler } from "./middleware/errorHandler.js";
 import roomRoutes from "./routes/roomRoutes.js";
-
+import passport from "passport";
+import "./utils/passport.js"
+import cors from "cors";
 dotenv.config();
 const app = express();
 
 app.use(express.json());
 
+app.use(
+  cors({
+    origin: process.env.FRONTEND_URL || "http://localhost:5173",
+    credentials: true,
+  })
+);
+//initialize passport
+app.use(passport.initialize());
 // Routes
 app.use("/api/auth", authRoutes);
 app.use("/api/health", healthRoutes);