Triển khai Login With Google ( NextJs - NestJs)

Next.js (Frontend)
 ├── Giao diện nút "Login with Google"
 ├── Gọi endpoint /auth/google (backend)
 └── Nhận JWT / session

NestJS (Backend)
 ├── Passport + Google OAuth2 Strategy
 ├── Endpoint callback xử lý token Google
 └── Trả JWT token về frontend

1. Setting google cloud

2. NestJs

  @Get('google')
  @UseGuards(AuthGuard('google'))
  @ApiOperation({ summary: 'Initiate Google OAuth login' })
  @ApiResponse({ status: 302, description: 'Redirect to Google OAuth' })
  async googleAuth() {
    // Passport sẽ tự động redirect đến Google OAuth
  }

  @Get('google/callback')
  @UseGuards(AuthGuard('google'))
  @ApiOperation({ summary: 'Google OAuth callback' })
  @ApiResponse({ status: 302, description: 'Redirect to frontend with token' })
  async googleAuthRedirect(@Request() req: any, @Res() res: Response) {
    const user = req.user;
    const result = await this.authService.login(user);
    // Redirect đến frontend với token
    const frontendUrl = process.env.FRONTEND_URL || 'http://localhost:3001';
    const redirectUrl = `${frontendUrl}/auth/callback?token=${result.access_token}&refresh_token=${result.refresh_token}`;

    res.redirect(redirectUrl);
  }