/*
 * 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.karaf.jaas.command;

import java.util.List;
import javax.security.auth.login.AppConfigurationEntry;

import org.apache.felix.gogo.commands.Command;
import org.apache.karaf.jaas.boot.ProxyLoginModule;
import org.apache.karaf.jaas.config.JaasRealm;
import org.apache.karaf.jaas.modules.BackingEngine;

/**
 * @author iocanel
 */
@Command(scope = "jaas", name = "realms", description = "Lists the existing JAAS realms.")
public class ListRealmsCommand extends JaasCommandSupport {

    private static final String REALM_LIST_FORMAT = "%5s %-20s %-80s";

    @Override
    protected Object doExecute(BackingEngine engine) throws Exception {
        return null;
    }

    protected Object doExecute() throws Exception {
        List<JaasRealm> realms = getRealms();
        if (realms != null && realms.size() > 0) {
            System.out.println(String.format(REALM_LIST_FORMAT, "Index","Realm", "Module Class"));
            int index = 1;
            for (JaasRealm realm : realms) {
                String realmName = realm.getName();
                AppConfigurationEntry[] entries = realm.getEntries();

                if (entries != null && entries.length > 0) {
                    for (int i = 0; i < entries.length; i++) {
                        String moduleClass = (String) entries[i].getOptions().get(ProxyLoginModule.PROPERTY_MODULE);
                        System.out.println(String.format(REALM_LIST_FORMAT, index++, realmName, moduleClass));
                    }
                } else {
                    System.out.println(String.format(REALM_LIST_FORMAT, realmName, "No module found for realm."));
                }
            }
        } else {
            System.err.println("No realm found");
        }
        return null;
    }

}
