This article will teach you how to integrate Google OAuth2 into your Rust application, all without relying on third-party OAuth crates such as https://crates.io/crates/oauth2. We'll be utilizing the Actix-Web HTTP framework, known for its high performance, to power the API. Additionally, we'll store data in a centralized in-memory database.

• Run the Rust Google OAuth2 Project
• Run the Rust OAuth2 API with a React.js App
• Setup the Rust Project with Cargo
• Obtain the Google OAuth2 Credentials
• Load the Environment Variables
• Create an In-memory Database
• Create the Response Structs
• Get the Google OAuth2 Access Token and User Info
• Create the Actix-Web Route Handlers
  • Register User Actix-Web Route Handler
  • Login User Actix-Web Route Handler
  • Implement the Google OAuth2
  • Logout User Actix-Web Route Handler
  • Retrieve the Authenticated User
  • Merge the Actix-Web Route Handlers
• Register the Actix-Web Config and Add CORS
• Test the Rust Google OAuth Flow
  • Register User
  • Login User
  • Authenticate with Google OAuth
  • Get Profile Information

Read the entire article here: https://codevoweb.com/how-to-implement-google-oauth2-in-rust/