Implementing Firebase GitHub Authentication in Flutter
In this article, I’m going to show you how to implement Firebase GitHub authentication method properly in Flutter. As you might already know, there are some Flutter plugins that are provided officially by Flutter team. And FlutterFire is a subset of them. I encourage you to go and try FlutterFire plugins sometime if you need quick backend solutions for your small-scale project; but for this article we’re going to need only the firebase_auth plugin. So, let me list all the steps that you need to do in order to implement GitHub authentication in your Flutter app:
Step 0. First of all, I assume that you already downloaded google-services.json file for Android and GoogleServices-Info.plist file for iOS from Firebase dashboard of your app and added them to your project properly.
Step 1. Create an OAuth app on GitHub via this link: https://github.com/settings/applications/new. As “authorization callback URL”, you need to set something like appname://auth. You will be redirected to this URL once you successfully log into GitHub on browser (which is the first step of this authorization method from the user point of view). We’re going to utilize this URL in later steps to set app’s deep link configuration, so that you can be redirected back to the app.
