Changed google login method and attempted manual redirect after login button pressed

Author: Vignesh-30

backend/user-service/package-lock.json

@@ -21,8 +21,17 @@
   },
   "dependencies": {
     "@nestjs/common": "^10.0.0",
+    "@nestjs/config": "^3.2.3",
     "@nestjs/core": "^10.0.0",
+    "@nestjs/jwt": "^10.2.0",
+    "@nestjs/passport": "^10.0.3",
     "@nestjs/platform-express": "^10.0.0",
+    "google-auth-library": "^9.14.1",
+    "passport": "^0.7.0",
+    "passport-google-oauth2": "^0.2.0",
+    "passport-google-oauth20": "^2.0.0",
+    "passport-jwt": "^4.0.1",
+    "passport-local": "^1.0.0",
     "reflect-metadata": "^0.2.0",
     "rxjs": "^7.8.1"
   },
@@ -33,6 +42,10 @@
     "@types/express": "^4.17.17",
     "@types/jest": "^29.5.2",
     "@types/node": "^20.3.1",
+    "@types/passport-google-oauth2": "^0.1.10",
+    "@types/passport-google-oauth20": "^2.0.16",
+    "@types/passport-jwt": "^4.0.1",
+    "@types/passport-local": "^1.0.38",
     "@types/supertest": "^6.0.0",
     "@typescript-eslint/eslint-plugin": "^8.0.0",
     "@typescript-eslint/parser": "^8.0.0",

backend/user-service/package.json

@@ -1,9 +1,17 @@
-import { Controller, Get } from '@nestjs/common';
+import { Controller, Get, Post, Req, Res } from '@nestjs/common';
+import { Request, Response } from 'express';
+import { AuthService } from './auth.service';
 
 @Controller('auth')
 export class AuthController {
-	@Get('google/login')
-	googleLogin() {
-		return {msg:"Login"}
+	constructor(private authService: AuthService) {}
+
+	@Post('/google/callback')
+	async handleRedirect(@Req() req: Request, @Res() res: Response) {
+		console.log("HELLLO")
+		const {code} = req.body
+		const tokens = await this.authService.exchangeCodeForTokens(code)
+		console.log(tokens)
+		res.json(tokens);
 	}
 }

backend/user-service/src/auth/auth.controller.ts

@@ -1,7 +1,12 @@
 import { Module } from '@nestjs/common';
 import { AuthController } from './auth.controller';
+import { AuthService } from './auth.service';
+import { ConfigModule } from '@nestjs/config';
+// import { GoogleStrategy } from './utils/google.strategy';
 
 @Module({
-  controllers: [AuthController]
+  imports: [ConfigModule],
+  controllers: [AuthController],
+  providers: [AuthService]
 })
 export class AuthModule {}

backend/user-service/src/auth/auth.module.ts

@@ -0,0 +1,18 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { AuthService } from './auth.service';
+
+describe('AuthService', () => {
+  let service: AuthService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [AuthService],
+    }).compile();
+
+    service = module.get<AuthService>(AuthService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

backend/user-service/src/auth/auth.service.spec.ts

@@ -0,0 +1,23 @@
+import { Injectable } from '@nestjs/common';
+import { OAuth2Client } from 'google-auth-library';
+
+@Injectable()
+export class AuthService {
+	private oAuth2Client: OAuth2Client;
+
+  constructor() {
+    this.oAuth2Client = new OAuth2Client('350585476549-mild3b1ggbtd57t4sduk8qlc7d8suq66.apps.googleusercontent.com', 
+		'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', 'http://localhost:3000');
+  }
+
+  async exchangeCodeForTokens(code: string) {
+    try {
+      const { tokens } = await this.oAuth2Client.getToken(code);
+
+      return tokens; // Contains access_token, refresh_token, and id_token
+    } catch (error) {
+		
+    }
+  }
+
+}

backend/user-service/src/auth/auth.service.ts

@@ -0,0 +1,5 @@
+import { Injectable } from "@nestjs/common";
+import { AuthGuard } from "@nestjs/passport";
+
+@Injectable()
+export class GoogleAuthGuard extends AuthGuard('google') {}

backend/user-service/src/auth/utils/google.guard.ts

@@ -0,0 +1,23 @@
+// import { Injectable } from "@nestjs/common";
+// import { PassportStrategy } from "@nestjs/passport";
+// import { Profile, Strategy } from "passport-google-oauth20";
+// import { ConfigService } from '@nestjs/config';
+
+// @Injectable()
+// export class GoogleStrategy extends PassportStrategy(Strategy) {
+// 	constructor(private configService: ConfigService) {
+// 		super({
+// 			clientID: configService.get<String>('GOOGLE_CLIENT_ID'),
+// 			clientSecret: configService.get<String>('GOOGLE_CLIENT_SECRET'),
+// 			callbackURL: 'http://localhost:3001/auth/google/callback',
+// 			scope: ['profile', 'email']
+// 		});
+// 	}
+	
+// 	async validate(access_token: string, refresh_token: string, profile: Profile) {
+// 		console.log(access_token);
+// 		console.log(refresh_token);
+// 		console.log(profile);
+// 	}
+
+// }

backend/user-service/src/auth/utils/google.strategy.ts

@@ -3,7 +3,9 @@ import { AppModule } from './app.module';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
-  app.setGlobalPrefix('api')
+  app.enableCors({
+    origin: 'http://localhost:3000'
+  })
   await app.listen(3001);
 }
 bootstrap();