source: branches/TaskRewrite/src/plugins/acegi-0.5.1/src/groovy/org/codehaus/groovy/grails/plugins/springsecurity/kerberos/GrailsKerberosAuthenticationProvider.groovy @ 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.kerberos

import org.springframework.security.Authentication
import org.springframework.security.AuthenticationException
import org.springframework.security.GrantedAuthority
import org.springframework.security.providers.jaas.JaasAuthenticationProvider
import org.springframework.security.providers.jaas.JaasAuthenticationToken

/**
 * Kerberos {@link AuthenticationProvider}.
 *
 * @author <a href='mailto:mmornati@byte-code.com'>Marco Mornati</a>
 * @author <a href='mailto:beckwithb@studentsonly.com'>Burt Beckwith</a>
 */
class GrailsKerberosAuthenticationProvider extends JaasAuthenticationProvider {

        def authenticateService
        def userDetailsService

        /**
         * {@inheritDoc}
         * @see org.springframework.security.providers.jaas.JaasAuthenticationProvider#authenticate(
         *      org.springframework.security.Authentication)
         */
        @Override
        Authentication authenticate(Authentication auth) throws AuthenticationException {

                Authentication authToken = super.authenticate(auth)

                if (authToken instanceof JaasAuthenticationToken) {
                        String username = authToken.principal
                        boolean retrieveDatabaseRoles = authenticateService.securityConfig.security.kerberosRetrieveDatabaseRoles
                        def dbDetails = userDetailsService.loadUserByUsername(username, retrieveDatabaseRoles)
                        def authorities = mergeDatabaseRoles(dbDetails, authToken.authorities)
                        dbDetails.authorities = authorities
                        authToken = new JaasAuthenticationToken(
                                        dbDetails, authToken.credentials,
                                        dbDetails.authorities, authToken.loginContext);
                }

                return authToken
        }

        private GrantedAuthority[] mergeDatabaseRoles(details, GrantedAuthority[] authorities) {
                List merged = []
                if (authorities) {
                        merged.addAll(authorities as List)
                }

                if (details.authorities) {
                        merged.addAll(details.authorities as List)
                }

                return merged as GrantedAuthority[]
        }
}