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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.activemq.security;

import java.security.Principal;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;

import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.BrokerPlugin;
import org.apache.activemq.jaas.GroupPrincipal;

/**
 * A simple authentication plugin
 *
 * @org.apache.xbean.XBean element="simpleAuthenticationPlugin"
 *                         description="Provides a simple authentication plugin
 *                         configured with a map of user-passwords and a map of
 *                         user-groups or a list of authentication users"
 *
 *
 */
public class SimpleAuthenticationPlugin implements BrokerPlugin {
    private Map userPasswords = new HashMap();
    private Map> userGroups = new HashMap>();
    private static final String DEFAULT_ANONYMOUS_USER = "anonymous";
    private static final String DEFAULT_ANONYMOUS_GROUP = "anonymous";
    private String anonymousUser = DEFAULT_ANONYMOUS_USER;
    private String anonymousGroup = DEFAULT_ANONYMOUS_GROUP;
    private boolean anonymousAccessAllowed = false;

    public SimpleAuthenticationPlugin() {
    }

    public SimpleAuthenticationPlugin(List users) {
        setUsers(users);
    }

    public Broker installPlugin(Broker parent) {
        SimpleAuthenticationBroker broker = new SimpleAuthenticationBroker(parent, userPasswords, userGroups);
        broker.setAnonymousAccessAllowed(anonymousAccessAllowed);
        broker.setAnonymousUser(anonymousUser);
        broker.setAnonymousGroup(anonymousGroup);
        return broker;
    }

    public Map> getUserGroups() {
        return userGroups;
    }

    /**
     * Sets individual users for authentication
     *
     * @org.apache.xbean.ElementType class="org.apache.activemq.security.AuthenticationUser"
     */
    public void setUsers(List users) {
        userPasswords.clear();
        userGroups.clear();
        for (Iterator it = users.iterator(); it.hasNext();) {
            AuthenticationUser user = (AuthenticationUser)it.next();
            userPasswords.put(user.getUsername(), user.getPassword());
            Set groups = new HashSet();
            if (user.getGroups() != null) {
                StringTokenizer iter = new StringTokenizer(user.getGroups(), ",");
                while (iter.hasMoreTokens()) {
                    String name = iter.nextToken().trim();
                    groups.add(new GroupPrincipal(name));
                }
            }
            userGroups.put(user.getUsername(), groups);
        }
    }


    public void setAnonymousAccessAllowed(boolean anonymousAccessAllowed) {
        this.anonymousAccessAllowed = anonymousAccessAllowed;
    }

    public boolean isAnonymousAccessAllowed() {
        return anonymousAccessAllowed;
    }

    public void setAnonymousUser(String anonymousUser) {
        this.anonymousUser = anonymousUser;
    }

    public String getAnonymousUser() {
        return anonymousUser;
    }

    public void setAnonymousGroup(String anonymousGroup) {
        this.anonymousGroup = anonymousGroup;
    }

    public String getAnonymousGroup() {
        return anonymousGroup;
    }

    /**
     * Sets the groups a user is in. The key is the user name and the value is a
     * Set of groups
     */
    public void setUserGroups(Map> userGroups) {
        this.userGroups = userGroups;
    }

    public Map getUserPasswords() {
        return userPasswords;
    }

    /**
     * Sets the map indexed by user name with the value the password
     */
    public void setUserPasswords(Map userPasswords) {
        this.userPasswords = userPasswords;
    }

}