source: branches/TaskRewrite/src/plugins/acegi-0.5.1/src/java/org/codehaus/groovy/grails/plugins/springsecurity/facebook/FacebookAuthenticationProvider.java @ 58

/* Copyright 2006-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.grails.plugins.springsecurity.facebook;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.security.Authentication;
import org.springframework.security.AuthenticationException;
import org.springframework.security.AuthenticationServiceException;
import org.springframework.security.BadCredentialsException;
import org.springframework.security.providers.AuthenticationProvider;
import org.springframework.security.userdetails.UserDetails;
import org.springframework.security.userdetails.UserDetailsService;
import org.springframework.util.Assert;

/**
 * Finalizes the authentication process by populating the local authorities for the authenticated user.
 *
 * @author <a href='mailto:beckwithb@studentsonly.com'>Burt Beckwith</a>
 */
public class FacebookAuthenticationProvider implements AuthenticationProvider, InitializingBean {

        private UserDetailsService _userDetailsService;

        /**
         * {@inheritDoc}
         * @see org.springframework.security.providers.AuthenticationProvider#authenticate(
         *      org.springframework.security.Authentication)
         */
        public Authentication authenticate(final Authentication authentication) throws AuthenticationException {

                if (!supports(authentication.getClass()) ||
                                !(authentication instanceof FacebookAuthenticationToken)) {
                        return null;
                }

                FacebookAuthenticationToken token = (FacebookAuthenticationToken)authentication;
                FacebookAuthenticationToken.Status status = token.getStatus();

                switch (status) {
                        case success:
                                UserDetails userDetails = _userDetailsService.loadUserByUsername(String.valueOf(token.getUserId()));
                                return new FacebookAuthenticationToken(userDetails.getAuthorities(),
                                                token.getUserId(), token.getSessionKey());
                        case failure:
                                throw new BadCredentialsException("Log in failed - identity could not be verified");
                        case error:
                                throw new AuthenticationServiceException("Error message from server: " + token.getErrorMessage());
                }

                // unreachable
                return null;
        }

        /**
         * Dependency injection for the user detail service.
         * @param userDetailsService  the service
         */
        public void setUserDetailsService(final UserDetailsService userDetailsService) {
                _userDetailsService = userDetailsService;
        }

   /**
    * {@inheritDoc}
    * @see org.springframework.security.providers.AuthenticationProvider#supports(java.lang.Class)
    */
   @SuppressWarnings("unchecked")
        public boolean supports(final Class authentication) {
       return FacebookAuthenticationToken.class.isAssignableFrom(authentication);
   }

        /**
         * {@inheritDoc}
         * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
         */
        public void afterPropertiesSet() {
                Assert.notNull(_userDetailsService, "The userDetailsService must be set");
        }
}