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15.3.8. HTTP Authentication

Although we do not recommend it unless absolutely necessary, Seam provides the means to authenticate with either HTTP Basic or HTTP Digest (RFC 2617) methods. For either form, you must first enable the authentication-filter component in components.xml: 
<web:authentication-filter url-pattern="*.seam" auth-type="basic"/>
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To enable basic authentication, set auth-type to basic. For digest authentication, set it to digest. If you want to use digest authentication, you must also set the key and realm: 
<web:authentication-filter url-pattern="*.seam" auth-type="digest" 
     key="AA3JK34aSDlkj" realm="My App"/>
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The key can be any String value. The realm is the name of the authentication realm that is presented to the user when they authenticate.

15.3.8.1. Writing a Digest Authenticator
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If using digest authentication, your authenticator class should extend the abstract class org.jboss.seam.security.digest.DigestAuthenticator, and use the validatePassword() method to validate the user's plain text password against the digest request. Here is an example: 
public boolean authenticate() {
  try {
    User user = (User) entityManager.createQuery(
         "from User where username = "username")
         .setParameter("username", identity.getUsername())
         .getSingleResult();

    return validatePassword(user.getPassword());
  } catch (NoResultException ex) {
    return false;
  }
}
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