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15.13. OpenID

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OpenID is a community standard for external web-based authentication. Any web application can supplement (or replace) its local authentication handling by delegating responsibility to an external OpenID server selected by the user. This benefits both user and developer — the user (who no longer needs to remember login details for multiple web applications), and the developer (who need not maintain an entire complex authentication system).
When using OpenID, the user selects an OpenID provider, and the provider assigns the user an OpenID. The ID takes the form of a URL — http://maximoburrito.myopenid.com, for example. (The http:// portion of the identifier can be omitted when logging into a site.) The web application (known as a relying party) determines which OpenID server to contact and redirects the user to the remote site for authentication. When authentication succeeds, the user is given the (cryptographically secure) token proving his identity and is redirected back to the original web application. The local web application can then assume that the user accessing the application owns the OpenID presented.
However, authentication does not imply authorization. The web application must still determine how to treat the OpenID authentication. The web application can choose to treat the user as instantly logged in and grant full access to the system, or it can attempt to map the OpenID to a local user account and prompt unregistered users to register. This is a design decision for the local application.

15.13.1. Configuring OpenID
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Seam uses the opemid4java package, and requires four additional JARs to make use of Seam integration. These are htmlparser.jar, openid4java.jar, openxri-client.jar and openxri-syntax.jar.
OpenID processing requires the OpenIdPhaseListener, which should be added to your faces-config.xml file. The phase listener processes the callback from the OpenID provider, allowing re-entry into the local application. 
<lifecycle> 
  <phase-listener>
    org.jboss.seam.security.openid.OpenIdPhaseListener
  </phase-listener> 
</lifecycle>
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This configuration makes OpenID support available to your application. The OpenID support component, org.jboss.seam.security.openid.openid, is installed automatically if the openid4java classes are on the classpath.
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