GitHub OAuth for Flutter

github_oauth is a Flutter package that simplifies the process of integrating GitHub OAuth authentication into your app. With this package, you can provide a seamless GitHub sign-in experience, handle token exchanges, and authenticate users securely.

Features

• Complete OAuth2 Flow: Handles the entire GitHub OAuth process, from user login to token retrieval.
• Customizable UI: Customize the sign-in page title and WebView configuration to match your app's branding.
• WebView Integration: Provides a native WebView for a smooth sign-in experience.
• Secure Token Handling: Retrieve and manage GitHub access tokens securely.
• Comprehensive Error Handling: Manage errors throughout the OAuth process.

Installation

Add github_oauth to your pubspec.yaml:

dependencies:
  github_oauth: latest_version

Then run flutter pub get to install the package.

Usage

1. Setup GitHub OAuth App

To use GitHub OAuth, you need to set up an OAuth app on GitHub. Follow these steps:

1. Go to GitHub Developer Settings.
2. Register a new OAuth application.
3. Set your app's redirect URI (e.g., yourapp://callback).

2. Configure GitHubSignIn

Import the package and initialize GitHubSignIn with your GitHub OAuth credentials. Use the dotenv package to manage sensitive information:

import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:github_oauth/github_oauth.dart';

final gitHubSignIn = GitHubSignIn(
  clientId: dotenv.env['GITHUB_CLIENT_ID']!,
  clientSecret: dotenv.env['GITHUB_CLIENT_SECRET']!,
  redirectUrl: dotenv.env['GITHUB_REDIRECT_URL']!,
);

3. Sign In with GitHub

Call the signIn method to trigger the OAuth flow:

void _signInWithGitHub(BuildContext context) async {
  final result = await gitHubSignIn.signIn(context);

  if (result.status == GitHubSignInResultStatus.ok) {
    // Successfully signed in
    print("Access Token: ${result.token}");
    print("User Profile: ${result.userProfile}");
  } else {
    // Handle error
    print("Sign In Failed: ${result.errorMessage}");
  }
}

4. Customize WebView

You can customize the WebView used during the sign-in process by passing additional parameters to GitHubSignInPage:

GitHubSignInPage(
  url: 'authorization-url',
  redirectUrl: 'redirect-url',
  title: 'Sign in with GitHub',
  userAgent: 'Custom User Agent',
  clearCache: true,
);

Example

Here's a complete example of how to use the github_oauth package:

import 'package:flutter/material.dart';
import 'package:github_oauth/github_oauth.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';

void main() async {
  await dotenv.load();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: SignInPage(),
    );
  }
}

class SignInPage extends StatelessWidget {
  final GitHubSignIn githubSignIn = GitHubSignIn(
    clientId: dotenv.env['GITHUB_CLIENT_ID']!,
    clientSecret: dotenv.env['GITHUB_CLIENT_SECRET']!,
    redirectUrl: dotenv.env['GITHUB_REDIRECT_URL']!,
  );

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('GitHub OAuth Example')),
      body: Center(
        child: ElevatedButton(
          onPressed: () async {
            final result = await githubSignIn.signIn(context);

            if (result.status == GitHubSignInResultStatus.ok) {
              // Successfully signed in
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(content: Text('Token: ${result.token}')),
              );
            } else {
              // Error handling
              ScaffoldMessenger.of(context).showSnackBar(
                SnackBar(content: Text('Error: ${result.errorMessage}')),
              );
            }
          },
          child: Text('Sign in with GitHub'),
        ),
      ),
    );
  }
}

Error Handling

The GitHubSignInResult includes status and error messages, which can help you handle various scenarios:

if (result.status == GitHubSignInResultStatus.ok) {
  // Successfully signed in
} else if (result.status == GitHubSignInResultStatus.cancelled) {
  // User cancelled the sign-in process
} else {
  // Sign-in failed
  print('Error: ${result.errorMessage}');
}

Contribution

Contributions are welcome! If you find a bug or have an idea for a new feature, feel free to open an issue or submit a pull request.

License

This package is licensed under the MIT License. See the LICENSE file for more details.