initial setup for google signin signup integration

backend/src/routes/v1/auth.ts

@@ -1,10 +1,50 @@
 import express from 'express';
 const router = express.Router();
 import { body } from 'express-validator';
+import passport from 'passport';
 import { requireAuth, validateRequest } from '../../middleware';
 import { authController } from '../../controllers/v1';
 import { authLimiter } from '../../helpers/rateLimiter';
 import { AUTH_MODE_JWT } from '../../variables';
+import { User } from '../../models';
+import { createToken } from '../../helpers/auth';
+import { getJwtProviderAuthLifetime, getJwtProviderAuthSecret } from '../../config';
+
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const GoogleStrategy = require('passport-google-oidc');
+
+passport.use(new GoogleStrategy({
+  passReqToCallback: true,
+  clientID: process.env['GOOGLE_CLIENT_ID'],
+  clientSecret: process.env['GOOGLE_CLIENT_SECRET'],
+  callbackURL: '/api/v1/auth/google/callback',
+}, async (req: express.Request, issuer: any, profile: any, cb: any) => {
+  const email = profile.emails[0].value;
+  let user = await User.findOne({
+    authProvider: issuer,
+    authId: profile.id,
+  })
+
+  if (!user) {
+    user = await new User({
+      email,
+      authProvider: issuer,
+      authId: profile.id,
+    }).save();
+  }
+
+  const providerAuthToken = createToken({
+    payload: {
+      userId: user._id.toString(),
+      email: user.email,
+    },
+    expiresIn: getJwtProviderAuthLifetime(),
+    secret: getJwtProviderAuthSecret(),
+  });
+
+  req.providerAuthToken = providerAuthToken;
+  cb(null, profile);
+}));
 
 router.post('/token', validateRequest, authController.getNewToken);
 
@@ -27,20 +67,34 @@ router.post( // deprecated (moved to api/v2/auth/login2)
 );
 
 router.post(
-  '/logout', 
+  '/logout',
   authLimiter,
   requireAuth({
     acceptedAuthModes: [AUTH_MODE_JWT]
-  }), 
+  }),
   authController.logout
 );
 
 router.post(
-  '/checkAuth', 
+  '/checkAuth',
   requireAuth({
     acceptedAuthModes: [AUTH_MODE_JWT]
-  }), 
+  }),
   authController.checkAuth
 );
 
+router.get(
+  '/login/federated/google',
+  authLimiter,
+  passport.authenticate('google', {
+    scope: ['profile', 'email'],
+  }),
+)
+
+router.get(
+  '/google/callback',
+  passport.authenticate('google', { failureRedirect: '/error', session: false }),
+  authController.handleGoogleCallback,
+)
+
 export default router;