001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.servicemix.common.security;
018    
019    import java.security.GeneralSecurityException;
020    import java.lang.reflect.Proxy;
021    import java.lang.reflect.InvocationHandler;
022    import java.lang.reflect.Method;
023    
024    import javax.security.auth.Subject;
025    
026    /**
027     * Interface for the authentication service.
028     *
029     */
030    public interface AuthenticationService {
031    
032        /**
033         * Authenticate a user given its name and credentials.
034         * Upon sucessfull completion, the subject should be populated
035         * with the user known principals.
036         *
037         * @param subject the subject to populate
038         * @param domain the security domain to use
039         * @param user the user name
040         * @param credentials the user credntials
041         * @throws GeneralSecurityException if the user can not be authenticated
042         */
043        void authenticate(Subject subject, String domain, String user, Object credentials) throws GeneralSecurityException;
044    
045        public static final class Proxy {
046            public static AuthenticationService create(final Object target) {
047                return (AuthenticationService) java.lang.reflect.Proxy.newProxyInstance(AuthenticationService.class.getClassLoader(), 
048                                                                                        new Class[] { AuthenticationService.class },
049                                                                                        new InvocationHandler() {
050                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
051                        try {
052                            Object o = target.getClass().getMethod(method.getName(), method.getParameterTypes()).invoke(target, args);
053                            return o;
054                        } catch (Throwable t) {
055                            t.printStackTrace();
056                            throw t;
057                        }
058                    }
059                });
060            }
061        }
062    
063    }