How To: Login to the Identity Server using Facebook Credentials

Current trends require usage of services from hundreds of websites in a connected world. Most of these websites need the user to create an account with them by providing a valid email address and password. Remembering all the different user IDs and passwords that you use can be difficult and cumbersome. To make the life easier most websites now provide the user with an option to log in using their Facebook account, Twitter account or Google account. Since most of the internet users have one of these accounts, it makes creating a new account an instant action.

WSO2 Identity Server enables users to log in to the Identity Server using their Facebook account. To do that, first you have to create a Facebook app after registering as a Facebook developer.

This topic provides instructions on how to configure the Facebook app and the Identity Server to integrate using a sample app. See the following sections for more information.

Configuring the Facebook app

1. Go to https://developers.facebook.com/ and log in using your Facebook credentials.
2. Click on My Apps and then click Create a New App.  
   
3. Choose the platform you wish to use. Select Website here when working with this sample.
   
4. Enter the name of your new app in the window that appears and click Create New Facebook App ID.
    
5. Enter a Display Name, Contact Email and select an appropriate category from the dropdown. Click Create App ID.
   
6. This will lead you to the quick start guide. You can view the configuration there and skip the quick start guide to access the developer dashboard. 
   

7. This will take you to the app Dashboard where you can find the App ID and App Secret as shown in the image below. Click Show to view the App Secret.

   App ID is the Client ID and the App Secret is the Client Secret in OAuth terminology. The API Version is Facebook’s API that is used to create the application.

   

8. Click Settings on the left menu and navigate to the Basic tab. Add the App Domains (since WSO2 IS is running on localhost, you can add localhost as the App Domain) and click Add Platform. 
   

9. Select Website  as the platform for the application and enter the following as the site URL: https://localhost:9443. Click Save Changes. 
   

10. On the left panel, click Add Product and click Get Started for a Facebook Login product. 
    

11. You can configure the Client OAuth Settings on the window that appears.
    

    1. Client OAuth Login should be set to Yes.
    2. Web OAuth Login should be set to Yes.
    3. Valid OAuth redirect URIs should be set to https://localhost:9443/commonauth.
12. Scroll down and click the Save Changes button to save the changes.

Now you have finished configuring Facebook as an Identity Provider.

Deploying travelocity.com sample app

The next step is to deploy the travelocity.com sample app in order to use it in this scenario.

1. You can download travelocity.com.war file from here.
2. Deploy this sample web app on a web container. 
   1. Use the Apache Tomcat server to do this.
   2. Since this sample is written based on Servlet 3.0, it needs to be deployed on Tomcat 7.x.

   3. Copy the .war file into the webapps folder. For example, <APACHE_HOME>/apache-tomcat-7.0.50/webapps.

Once this is done, the next step is to configure the WSO2 Identity Server by adding a service provider and identity provider.

Configuring the identity provider

Now you have to configure WSO2 Identity Server by adding a new identity provider.

1. Download the WSO2 Identity Server from here and run it.
2. Log in to the Management Console as an administrator.
3. In the Identity section under the Main tab of the Management Console, click Add under Identity Providers.
4. Give a suitable name as the Identity Provider Name.
   

5. Go to Facebook Configuration under Federated Authenticators. 

6. Enter the following values in the form that appears:

   Field	Description	Sample Value
   App ID	This refers to the Client Id you received from the Facebook app you created.	<Application ID of the Facebook App>
   App Secret	This refers to the Client Secret you received from the Facebook app you created.	<App Secret of the Facebook App>
   Scope	Defines the permission to access particular information from a Facebook profile. See the Permissions Reference for a list of the different permission groups in Facebook APIs.	email
   User Information Fields	These are the claims related to the user account on Facebook. WSO2 Identity Server requests these fields from Facebook when a user is authenticated with Facebook through the IS. See public_profile permission for more information about these fields.	id,name,gender,email,first_name,last_name,age_range,link

   

7. Select both checkboxes to Enable Facebook Authenticator and make it the Default.

8. Click Register.

You have now added the identity provider.

Configuring the service provider

The next step is to configure the service provider.

1. Return to the Management Console.
2. In the Identity section under the Main tab, click Add under Service Providers.
3. Enter travelocity.com in the Service Provider Name text box and click Register.
4. In the Inbound Authentication Configuration section, click Configure under the SAML2 Web SSO Configuration section.
   
   Now set the configuration as follows:

   1. Enter the following values:

      Issuer: travelocity.com

      Assertion Consumer URL: http://localhost:8080/travelocity.com/home.jsp

   2. Select the following check-boxes:

      Enable Response Signing

      Enable Single Logout

      Enable Attribute Profile

      Include Attributes in the Response Always

5. Click Register. Now you will be sent back to the Service Providers page.

6. Go to the Local and Outbound Authentication Configuration section.

7. Select the Federated Authentication radio button and select the Identity Provider you created from the dropdown list under Federated Authentication. 
   

8. Click Update to save the changes.

You have now added and configured the service provider.

Configuring claim mappings for Facebook

The next step is to configure claims in the Identity Server and map them with Facebook.

1. In the Identity section under the Main tab, click List under Identity Providers.
2. Click Edit to edit the facebook identity provider you created. 
3. Under Claim Configuration, go to Basic Claim Configuration.
4. Select the Define Custom Claim Dialect option under Select Claim mapping Dialect. 
5. Click Add Claim Mapping to add custom claim mappings as follows.
   

6. You can retrieve all the public information of the user and the email address. The following are some common attribute names.

   id
   email
   name
   first_name
   last_name
   link
   gender
   locale
   age_range

   More information is available from the following link: https://developers.facebook.com/docs/facebook-login/permissions/v2.0

   You can map these attributes to any Local Claim URI that is suitable.

7. Select a suitable User ID Claim URI (e.g., email).
8. Click Update to save changes.