Simple Google Sign-in

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Simple Google Sign-In provides Google sign-in with OAuth 2.0 for Android, iOS, Windows, Mac, Universal Windows Platform (UWP) and WebGL apps made with Unity.​

Authentication may be a headache, especially for beginners, especially on different platforms. So I decided to take a fresh look of current possibilities that Google and Unity provide at the moment. And after a week of research I said "Bingo!". My asset is an extremely simple solution with about 200 lines of code only. Lightweight, tiny and clean, with no massive plugins and 3rd party libs!

Benefits

• Cross-platform user auth for cross-platform games and apps
• No plugins, no 3rd party libs, no dependencies
• No impact to build size
• More security for client-server apps (get access token on a client, get all user data on a server to avoid tampering)
• JSON Web Tokens (JWT) validation

General workflow

• Your app navigates users to Google using a default web browser
• Users perform sign-in to their Google account
• Google redirects users to your app (using deep linking when possible) and provides an authorization code in URI parameters
• The app is activated and obtains an authorization code
• The app exchanges the code for an access token
• The app requests user data with the access token (ID, name, email and other data according access scope defined)

Workflow for Windows, Mac and Editor

• Google redirects users to http://localhost:PORT/
• The app listens to localhost using HttpListener

Workflow for WebGL

• Redirect to Authorization Middleware is used to temporary save an auth code
• The app obtains the code from Authorization Middleware with a POST request

Asset Store: http://u3d.as/32YE
Wiki: https://github.com/hippogamesunity/SimpleGoogleSignIn/wiki