Implement Google OAuth 2.0 Authentication in Blazor with AutoRenderMode Support

[neozhu]

Untitled.video.-.Made.with.Clipchamp.7.mp4

Description

This PR introduces Google OAuth 2.0 Authentication to support external login in Blazor applications, including the ability to register and sign in users via Google.

Key Features:

1. Google Application Registration:

   • Added configuration to support Google OAuth:

     "Authentication": {
       "Google": {
         "ClientId": "your-client-id",
         "ClientSecret": "your-client-secret"
       }
     }

   • Replace "your-client-id" and "your-client-secret" with values from your Google Developer Console.

2. Generate Google Login URL:

   • Added a route /google/loginUrl to dynamically generate the Google OAuth 2.0 authorization URL.
   • Example Usage:

     GET /google/loginUrl?state=your-redirect-uri

     • Returns a URL that clients can use to initiate the Google login flow.

3. Handle Google Sign-In Callback:

   • Added a route /google/signIn to exchange the Google authorization code for an ID token.
   • Validates the token, creates a user if necessary, and signs in the user.
   • Behavior:
     • Existing users are logged in.
     • New users are automatically registered with the following properties:
       • Email
       • Name (Google profile name)
       • Avatar URL
       • Default settings like LanguageCode and TimeZoneId.

Routes:

• GET /google/loginUrl: Generates the Google OAuth 2.0 login URL.
• POST /google/signIn: Handles the authorization code exchange and signs in the user.