LoginCallbackHandler.java

package org.cloudgraph.web.jaas;

import java.io.IOException;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
 
/** 
 * Password callback handler for resolving 
 * password/usernames for a JAAS login.
 */
public class LoginCallbackHandler implements CallbackHandler {

  public LoginCallbackHandler() {
    super();
  }
 
  public LoginCallbackHandler( String name, String password) {
    super();
    this.username = name;
    this.password = password;
    if (this.username == null)
    	throw new IllegalArgumentException("expected username argument");
    if (this.password == null)
    	throw new IllegalArgumentException("expected password argument");
  }
 
  public LoginCallbackHandler( String password) {
    super();
    this.password = password;
    if (this.password == null)
    	throw new IllegalArgumentException("expected password argument");
  }
 
  private String password;
  private String username;
 
  /**
   * Handles the callbacks, and sets the user/password detail.
   * @param callbacks the callbacks to handle
   * @throws IOException if an input or output error occurs.
   */
  public void handle( Callback[] callbacks)
      throws IOException, UnsupportedCallbackException {
 
    for ( int i=0; i<callbacks.length; i++) {
      if ( callbacks[i] instanceof NameCallback && username != null) {
        NameCallback nc = (NameCallback) callbacks[i];
        nc.setName( username);
      }
      else if ( callbacks[i] instanceof PasswordCallback) {
        PasswordCallback pc = (PasswordCallback) callbacks[i];
        pc.setPassword( password.toCharArray());
      }
      else {
        /*throw new UnsupportedCallbackException(
        callbacks[i], "Unrecognized Callback");*/
      }
    }
  }
 
}