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    Github OpenID Connect

    Configure OpenID Connect with GitHub

    GitHub user’s must have a public email address configured to link on email (See Linking Strategies for more on this). An approach that will work for all users is to link on username or create an anonymous link. Using these strategies ensure that the configured Github OIDC connection works for every user, no matter their GitHub privacy settings.

    Once you have completed this configuration you may enable an OpenID Connect "Login with GitHub" button for one or more FusionAuth Applications. See GitHub - Creating an OAuth App for an additional reference.

    Login with GitHub

    Register a GitHub OAuth2 Application

    You will first need to log in to GitHub.

    Once logged in, navigate to Settings → Developer settings → OAuth Apps → Register a new application to create a new GitHub OAuth Application.

    Register a new GitHub OAuth Application

    Here we have configured our application Authorization callback URL. If FusionAuth is running at login.piedpiper.com, this value should be https://login.piedpiper.com/oauth2/callback.

    GitHub Client ID and Secret

    Once the application has been created, note the Client ID and the Client Secret. These will be used respectively as the Client Id value and the Client secret value in your FusionAuth OpenID Connect Identity Providers configuration. Please note that you may have to click on "Generate a new client secret".

    Configure a New FusionAuth OpenID Connect Identity Provider

    To create a GitHub Identity Provider return to FusionAuth and navigate to Settings → Identity Providers and click Add provider and select OpenID Connect from the dialog.

    This will take you to the Add OpenID Connect panel, and you’ll fill out the required fields.

    You will need to set Client authentication method to HTTP Basic authentication (client_secret_basic).

    Client Id and Client secret values reference the previously noted GitHub OAuth Application’s Client ID and Client Secret. The Redirect URL is read only and generated for you based upon the URL of FusionAuth, this value should match the one you configured in your GitHub application.

    GitHub has not implemented a well-known configuration endpoint, so you will need to disable the Discover endpoints field and specify the endpoints manually. The values for these fields are:

    • Authorization endpoint - https://github.com/login/oauth/authorize

    • Token endpoint - https://github.com/login/oauth/access_token

    • Userinfo endpoint - https://api.github.com/user

    You will need to specify user:email as a Scope for your application.

    In the following screenshot you will see that we have enabled this login provider for the Pied Piper application and enabled Create registration.

    GitHub does not implement OpenID Connect to spec. In order to pull in some additional data for populating the user profile (GitHub shortname, Image URL, etc.) you can enable a Reconcile lambda. This example lambda below is based on a GitHub use case. This is optional.

    Example lambda

    Here is an example of a simple Lambda that assists FusionAuth to reconcile the User from a successful GitHub login request.

    
    function reconcile(user, registration, jwt, id_token) {
      // This is an example lambda function reconcile the GitHub login
    
      // Set GitHub Avatar URL to the FusionAuth imageURL
      user.imageUrl = jwt.avatar_url;
    
      // Update the registration username to the GitHub short name
      registration.username = jwt.login;
    
      // Store the company and location returned from GitHub in custom user data.
      user.data = user.data || {};
      user.data.company = jwt.company;
      user.data.location = jwt.location;
    
      // The id_token may be available depending upon your IdP configuration.
      // - Ensure the value is defined before accessing it.
      if (id_token) {
        user.data.companyName = id_token.companyName;
      }
    
      // Create an event log of type 'Debug' when the lambda has Debug enabled
      console.debug('FusionAuth reconciled a User from GitHub and I helped!');
    }

    During development if you want to get a better idea of what your IdP is returning in the jwt object, you may print the contents of this object to the Event Log to help you write the lambda. Add the following line of code to your lambda to dump the entire object to an informational event log.

    
    // Pretty print the jwt object to the Event Log
    console.info(JSON.stringify(jwt, null, 2));

    Options

    The final item to configure is under the Options tab. For Github, you will want to configure:

    • Unique Id claim of id

    • Email claim of email

    • Username claim of login

    That’s it, now the Login with GitHub button will show up on the login page of our Pied Piper application.

    FusionAuth GitHub IdP Configuration

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