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49573866ab
Prevent duplicate instances of a manager by using it's getInstance() method instead of the manager's constructor. git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_2@13800 b35dd754-fafc-0310-a699-88a17e54d16e
712 lines
No EOL
30 KiB
Java
Executable file
712 lines
No EOL
30 KiB
Java
Executable file
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright 2005-2008 Jive Software.
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*
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* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.commands;
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import org.jivesoftware.smack.*;
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import org.jivesoftware.smack.filter.PacketFilter;
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import org.jivesoftware.smack.filter.PacketTypeFilter;
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import org.jivesoftware.smack.packet.IQ;
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import org.jivesoftware.smack.packet.Packet;
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import org.jivesoftware.smack.packet.PacketExtension;
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import org.jivesoftware.smack.packet.XMPPError;
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import org.jivesoftware.smack.util.StringUtils;
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import org.jivesoftware.smackx.Form;
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import org.jivesoftware.smackx.NodeInformationProvider;
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import org.jivesoftware.smackx.ServiceDiscoveryManager;
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import org.jivesoftware.smackx.commands.AdHocCommand.Action;
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import org.jivesoftware.smackx.commands.AdHocCommand.Status;
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import org.jivesoftware.smackx.packet.AdHocCommandData;
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import org.jivesoftware.smackx.packet.DiscoverInfo;
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import org.jivesoftware.smackx.packet.DiscoverInfo.Identity;
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import org.jivesoftware.smackx.packet.DiscoverItems;
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import java.lang.ref.WeakReference;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.List;
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import java.util.Map;
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import java.util.WeakHashMap;
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import java.util.concurrent.ConcurrentHashMap;
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/**
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* An AdHocCommandManager is responsible for keeping the list of available
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* commands offered by a service and for processing commands requests.
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*
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* Pass in a Connection instance to
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* {@link #getAddHocCommandsManager(org.jivesoftware.smack.Connection)} in order to
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* get an instance of this class.
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*
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* @author Gabriel Guardincerri
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*/
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public class AdHocCommandManager {
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private static final String DISCO_NAMESPACE = "http://jabber.org/protocol/commands";
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private static final String discoNode = DISCO_NAMESPACE;
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/**
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* The session time out in seconds.
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*/
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private static final int SESSION_TIMEOUT = 2 * 60;
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/**
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* Map a Connection with it AdHocCommandManager. This map have a key-value
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* pair for every active connection.
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*/
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private static Map<Connection, AdHocCommandManager> instances =
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Collections.synchronizedMap(new WeakHashMap<Connection, AdHocCommandManager>());
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/**
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* Register the listener for all the connection creations. When a new
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* connection is created a new AdHocCommandManager is also created and
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* related to that connection.
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*/
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static {
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Connection.addConnectionCreationListener(new ConnectionCreationListener() {
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public void connectionCreated(Connection connection) {
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getAddHocCommandsManager(connection);
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}
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});
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}
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/**
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* Returns the <code>AdHocCommandManager</code> related to the
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* <code>connection</code>.
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*
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* @param connection the XMPP connection.
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* @return the AdHocCommandManager associated with the connection.
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*/
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public static synchronized AdHocCommandManager getAddHocCommandsManager(Connection connection) {
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AdHocCommandManager ahcm = instances.get(connection);
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if (ahcm == null) ahcm = new AdHocCommandManager(connection);
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return ahcm;
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}
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/**
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* The Connection that this instances of AdHocCommandManager manages
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*/
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private final WeakReference<Connection> connection;
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/**
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* Map a command node with its AdHocCommandInfo. Note: Key=command node,
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* Value=command. Command node matches the node attribute sent by command
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* requesters.
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*/
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private final Map<String, AdHocCommandInfo> commands = new ConcurrentHashMap<String, AdHocCommandInfo>();
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/**
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* Map a command session ID with the instance LocalCommand. The LocalCommand
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* is the an objects that has all the information of the current state of
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* the command execution. Note: Key=session ID, Value=LocalCommand. Session
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* ID matches the sessionid attribute sent by command responders.
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*/
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private final Map<String, LocalCommand> executingCommands = new ConcurrentHashMap<String, LocalCommand>();
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private final ServiceDiscoveryManager serviceDiscoveryManager;
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/**
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* Thread that reaps stale sessions.
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*/
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private Thread sessionsSweeper;
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private AdHocCommandManager(Connection connection) {
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this.connection = new WeakReference<Connection>(connection);
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this.serviceDiscoveryManager = ServiceDiscoveryManager.getInstanceFor(connection);
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// Register the new instance and associate it with the connection
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instances.put(connection, this);
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// Add the feature to the service discovery manage to show that this
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// connection supports the AdHoc-Commands protocol.
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// This information will be used when another client tries to
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// discover whether this client supports AdHoc-Commands or not.
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ServiceDiscoveryManager.getInstanceFor(connection).addFeature(
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DISCO_NAMESPACE);
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// Set the NodeInformationProvider that will provide information about
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// which AdHoc-Commands are registered, whenever a disco request is
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// received
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ServiceDiscoveryManager.getInstanceFor(connection)
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.setNodeInformationProvider(discoNode,
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new NodeInformationProvider() {
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public List<DiscoverItems.Item> getNodeItems() {
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List<DiscoverItems.Item> answer = new ArrayList<DiscoverItems.Item>();
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Collection<AdHocCommandInfo> commandsList = getRegisteredCommands();
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for (AdHocCommandInfo info : commandsList) {
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DiscoverItems.Item item = new DiscoverItems.Item(
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info.getOwnerJID());
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item.setName(info.getName());
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item.setNode(info.getNode());
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answer.add(item);
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}
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return answer;
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}
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public List<String> getNodeFeatures() {
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return null;
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}
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public List<Identity> getNodeIdentities() {
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return null;
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}
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@Override
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public List<PacketExtension> getNodePacketExtensions() {
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return null;
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}
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});
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// The packet listener and the filter for processing some AdHoc Commands
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// Packets
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PacketListener listener = new PacketListener() {
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public void processPacket(Packet packet) {
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AdHocCommandData requestData = (AdHocCommandData) packet;
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processAdHocCommand(requestData);
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}
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};
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PacketFilter filter = new PacketTypeFilter(AdHocCommandData.class);
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connection.addPacketListener(listener, filter);
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sessionsSweeper = null;
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}
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/**
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* Registers a new command with this command manager, which is related to a
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* connection. The <tt>node</tt> is an unique identifier of that command for
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* the connection related to this command manager. The <tt>name</tt> is the
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* human readable name of the command. The <tt>class</tt> is the class of
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* the command, which must extend {@link LocalCommand} and have a default
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* constructor.
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*
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* @param node the unique identifier of the command.
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* @param name the human readable name of the command.
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* @param clazz the class of the command, which must extend {@link LocalCommand}.
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*/
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public void registerCommand(String node, String name, final Class<? extends LocalCommand> clazz) {
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registerCommand(node, name, new LocalCommandFactory() {
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public LocalCommand getInstance() throws InstantiationException, IllegalAccessException {
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return clazz.newInstance();
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}
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});
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}
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/**
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* Registers a new command with this command manager, which is related to a
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* connection. The <tt>node</tt> is an unique identifier of that
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* command for the connection related to this command manager. The <tt>name</tt>
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* is the human readeale name of the command. The <tt>factory</tt> generates
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* new instances of the command.
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*
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* @param node the unique identifier of the command.
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* @param name the human readable name of the command.
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* @param factory a factory to create new instances of the command.
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*/
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public void registerCommand(String node, final String name, LocalCommandFactory factory) {
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AdHocCommandInfo commandInfo = new AdHocCommandInfo(node, name, connection.get().getUser(), factory);
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commands.put(node, commandInfo);
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// Set the NodeInformationProvider that will provide information about
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// the added command
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serviceDiscoveryManager.setNodeInformationProvider(node,
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new NodeInformationProvider() {
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public List<DiscoverItems.Item> getNodeItems() {
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return null;
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}
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public List<String> getNodeFeatures() {
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List<String> answer = new ArrayList<String>();
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answer.add(DISCO_NAMESPACE);
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// TODO: check if this service is provided by the
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// TODO: current connection.
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answer.add("jabber:x:data");
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return answer;
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}
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public List<DiscoverInfo.Identity> getNodeIdentities() {
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List<DiscoverInfo.Identity> answer = new ArrayList<DiscoverInfo.Identity>();
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DiscoverInfo.Identity identity = new DiscoverInfo.Identity(
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"automation", name, "command-node");
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answer.add(identity);
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return answer;
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}
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@Override
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public List<PacketExtension> getNodePacketExtensions() {
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return null;
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}
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});
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}
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/**
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* Discover the commands of an specific JID. The <code>jid</code> is a
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* full JID.
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*
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* @param jid the full JID to retrieve the commands for.
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* @return the discovered items.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public DiscoverItems discoverCommands(String jid) throws XMPPException {
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return serviceDiscoveryManager.discoverItems(jid, discoNode);
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}
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/**
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* Publish the commands to an specific JID.
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*
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* @param jid the full JID to publish the commands to.
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* @throws XMPPException if the operation failed for some reason.
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*/
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public void publishCommands(String jid) throws XMPPException {
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// Collects the commands to publish as items
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DiscoverItems discoverItems = new DiscoverItems();
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Collection<AdHocCommandInfo> xCommandsList = getRegisteredCommands();
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for (AdHocCommandInfo info : xCommandsList) {
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DiscoverItems.Item item = new DiscoverItems.Item(info.getOwnerJID());
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item.setName(info.getName());
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item.setNode(info.getNode());
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discoverItems.addItem(item);
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}
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serviceDiscoveryManager.publishItems(jid, discoNode, discoverItems);
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}
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/**
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* Returns a command that represents an instance of a command in a remote
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* host. It is used to execute remote commands. The concept is similar to
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* RMI. Every invocation on this command is equivalent to an invocation in
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* the remote command.
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*
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* @param jid the full JID of the host of the remote command
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* @param node the identifier of the command
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* @return a local instance equivalent to the remote command.
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*/
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public RemoteCommand getRemoteCommand(String jid, String node) {
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return new RemoteCommand(connection.get(), node, jid);
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}
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/**
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* Process the AdHoc-Command packet that request the execution of some
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* action of a command. If this is the first request, this method checks,
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* before executing the command, if:
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* <ul>
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* <li>The requested command exists</li>
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* <li>The requester has permissions to execute it</li>
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* <li>The command has more than one stage, if so, it saves the command and
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* session ID for further use</li>
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* </ul>
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*
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* <br>
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* <br>
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* If this is not the first request, this method checks, before executing
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* the command, if:
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* <ul>
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* <li>The session ID of the request was stored</li>
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* <li>The session life do not exceed the time out</li>
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* <li>The action to execute is one of the available actions</li>
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* </ul>
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*
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* @param requestData
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* the packet to process.
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*/
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private void processAdHocCommand(AdHocCommandData requestData) {
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// Only process requests of type SET
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if (requestData.getType() != IQ.Type.SET) {
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return;
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}
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// Creates the response with the corresponding data
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AdHocCommandData response = new AdHocCommandData();
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response.setTo(requestData.getFrom());
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response.setPacketID(requestData.getPacketID());
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response.setNode(requestData.getNode());
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response.setId(requestData.getTo());
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String sessionId = requestData.getSessionID();
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String commandNode = requestData.getNode();
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if (sessionId == null) {
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// A new execution request has been received. Check that the
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// command exists
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if (!commands.containsKey(commandNode)) {
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// Requested command does not exist so return
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// item_not_found error.
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respondError(response, XMPPError.Condition.item_not_found);
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return;
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}
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// Create new session ID
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sessionId = StringUtils.randomString(15);
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try {
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// Create a new instance of the command with the
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// corresponding sessioid
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LocalCommand command = newInstanceOfCmd(commandNode, sessionId);
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response.setType(IQ.Type.RESULT);
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command.setData(response);
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// Check that the requester has enough permission.
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// Answer forbidden error if requester permissions are not
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// enough to execute the requested command
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if (!command.hasPermission(requestData.getFrom())) {
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respondError(response, XMPPError.Condition.forbidden);
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return;
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}
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Action action = requestData.getAction();
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// If the action is unknown then respond an error.
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if (action != null && action.equals(Action.unknown)) {
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respondError(response, XMPPError.Condition.bad_request,
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AdHocCommand.SpecificErrorCondition.malformedAction);
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return;
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}
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// If the action is not execute, then it is an invalid action.
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if (action != null && !action.equals(Action.execute)) {
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respondError(response, XMPPError.Condition.bad_request,
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AdHocCommand.SpecificErrorCondition.badAction);
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return;
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}
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// Increase the state number, so the command knows in witch
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// stage it is
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command.incrementStage();
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// Executes the command
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command.execute();
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if (command.isLastStage()) {
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// If there is only one stage then the command is completed
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response.setStatus(Status.completed);
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}
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else {
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// Else it is still executing, and is registered to be
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// available for the next call
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response.setStatus(Status.executing);
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executingCommands.put(sessionId, command);
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// See if the session reaping thread is started. If not, start it.
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if (sessionsSweeper == null) {
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sessionsSweeper = new Thread(new Runnable() {
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public void run() {
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while (true) {
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for (String sessionId : executingCommands.keySet()) {
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LocalCommand command = executingCommands.get(sessionId);
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// Since the command could be removed in the meanwhile
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// of getting the key and getting the value - by a
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// processed packet. We must check if it still in the
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// map.
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if (command != null) {
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long creationStamp = command.getCreationDate();
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// Check if the Session data has expired (default is
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// 10 minutes)
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// To remove it from the session list it waits for
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// the double of the of time out time. This is to
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// let
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// the requester know why his execution request is
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// not accepted. If the session is removed just
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// after the time out, then whe the user request to
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// continue the execution he will recieved an
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// invalid session error and not a time out error.
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if (System.currentTimeMillis() - creationStamp > SESSION_TIMEOUT * 1000 * 2) {
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// Remove the expired session
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executingCommands.remove(sessionId);
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}
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}
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}
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try {
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Thread.sleep(1000);
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}
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catch (InterruptedException ie) {
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// Ignore.
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}
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}
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}
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});
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sessionsSweeper.setDaemon(true);
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sessionsSweeper.start();
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}
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}
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// Sends the response packet
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connection.get().sendPacket(response);
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}
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catch (XMPPException e) {
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// If there is an exception caused by the next, complete,
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// prev or cancel method, then that error is returned to the
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// requester.
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XMPPError error = e.getXMPPError();
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// If the error type is cancel, then the execution is
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// canceled therefore the status must show that, and the
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// command be removed from the executing list.
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if (XMPPError.Type.CANCEL.equals(error.getType())) {
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response.setStatus(Status.canceled);
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executingCommands.remove(sessionId);
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}
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respondError(response, error);
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e.printStackTrace();
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}
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}
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else {
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LocalCommand command = executingCommands.get(sessionId);
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// Check that a command exists for the specified sessionID
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// This also handles if the command was removed in the meanwhile
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// of getting the key and the value of the map.
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if (command == null) {
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respondError(response, XMPPError.Condition.bad_request,
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AdHocCommand.SpecificErrorCondition.badSessionid);
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return;
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}
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// Check if the Session data has expired (default is 10 minutes)
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long creationStamp = command.getCreationDate();
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if (System.currentTimeMillis() - creationStamp > SESSION_TIMEOUT * 1000) {
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// Remove the expired session
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executingCommands.remove(sessionId);
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// Answer a not_allowed error (session-expired)
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respondError(response, XMPPError.Condition.not_allowed,
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AdHocCommand.SpecificErrorCondition.sessionExpired);
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return;
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}
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/*
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* Since the requester could send two requests for the same
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* executing command i.e. the same session id, all the execution of
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* the action must be synchronized to avoid inconsistencies.
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*/
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synchronized (command) {
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Action action = requestData.getAction();
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// If the action is unknown the respond an error
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|
if (action != null && action.equals(Action.unknown)) {
|
|
respondError(response, XMPPError.Condition.bad_request,
|
|
AdHocCommand.SpecificErrorCondition.malformedAction);
|
|
return;
|
|
}
|
|
|
|
// If the user didn't specify an action or specify the execute
|
|
// action then follow the actual default execute action
|
|
if (action == null || Action.execute.equals(action)) {
|
|
action = command.getExecuteAction();
|
|
}
|
|
|
|
// Check that the specified action was previously
|
|
// offered
|
|
if (!command.isValidAction(action)) {
|
|
respondError(response, XMPPError.Condition.bad_request,
|
|
AdHocCommand.SpecificErrorCondition.badAction);
|
|
return;
|
|
}
|
|
|
|
try {
|
|
// TODO: Check that all the requierd fields of the form are
|
|
// TODO: filled, if not throw an exception. This will simplify the
|
|
// TODO: construction of new commands
|
|
|
|
// Since all errors were passed, the response is now a
|
|
// result
|
|
response.setType(IQ.Type.RESULT);
|
|
|
|
// Set the new data to the command.
|
|
command.setData(response);
|
|
|
|
if (Action.next.equals(action)) {
|
|
command.incrementStage();
|
|
command.next(new Form(requestData.getForm()));
|
|
if (command.isLastStage()) {
|
|
// If it is the last stage then the command is
|
|
// completed
|
|
response.setStatus(Status.completed);
|
|
}
|
|
else {
|
|
// Otherwise it is still executing
|
|
response.setStatus(Status.executing);
|
|
}
|
|
}
|
|
else if (Action.complete.equals(action)) {
|
|
command.incrementStage();
|
|
command.complete(new Form(requestData.getForm()));
|
|
response.setStatus(Status.completed);
|
|
// Remove the completed session
|
|
executingCommands.remove(sessionId);
|
|
}
|
|
else if (Action.prev.equals(action)) {
|
|
command.decrementStage();
|
|
command.prev();
|
|
}
|
|
else if (Action.cancel.equals(action)) {
|
|
command.cancel();
|
|
response.setStatus(Status.canceled);
|
|
// Remove the canceled session
|
|
executingCommands.remove(sessionId);
|
|
}
|
|
|
|
connection.get().sendPacket(response);
|
|
}
|
|
catch (XMPPException e) {
|
|
// If there is an exception caused by the next, complete,
|
|
// prev or cancel method, then that error is returned to the
|
|
// requester.
|
|
XMPPError error = e.getXMPPError();
|
|
|
|
// If the error type is cancel, then the execution is
|
|
// canceled therefore the status must show that, and the
|
|
// command be removed from the executing list.
|
|
if (XMPPError.Type.CANCEL.equals(error.getType())) {
|
|
response.setStatus(Status.canceled);
|
|
executingCommands.remove(sessionId);
|
|
}
|
|
respondError(response, error);
|
|
|
|
e.printStackTrace();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Responds an error with an specific condition.
|
|
*
|
|
* @param response the response to send.
|
|
* @param condition the condition of the error.
|
|
*/
|
|
private void respondError(AdHocCommandData response,
|
|
XMPPError.Condition condition) {
|
|
respondError(response, new XMPPError(condition));
|
|
}
|
|
|
|
/**
|
|
* Responds an error with an specific condition.
|
|
*
|
|
* @param response the response to send.
|
|
* @param condition the condition of the error.
|
|
* @param specificCondition the adhoc command error condition.
|
|
*/
|
|
private void respondError(AdHocCommandData response, XMPPError.Condition condition,
|
|
AdHocCommand.SpecificErrorCondition specificCondition)
|
|
{
|
|
XMPPError error = new XMPPError(condition);
|
|
error.addExtension(new AdHocCommandData.SpecificError(specificCondition));
|
|
respondError(response, error);
|
|
}
|
|
|
|
/**
|
|
* Responds an error with an specific error.
|
|
*
|
|
* @param response the response to send.
|
|
* @param error the error to send.
|
|
*/
|
|
private void respondError(AdHocCommandData response, XMPPError error) {
|
|
response.setType(IQ.Type.ERROR);
|
|
response.setError(error);
|
|
connection.get().sendPacket(response);
|
|
}
|
|
|
|
/**
|
|
* Creates a new instance of a command to be used by a new execution request
|
|
*
|
|
* @param commandNode the command node that identifies it.
|
|
* @param sessionID the session id of this execution.
|
|
* @return the command instance to execute.
|
|
* @throws XMPPException if there is problem creating the new instance.
|
|
*/
|
|
private LocalCommand newInstanceOfCmd(String commandNode, String sessionID)
|
|
throws XMPPException
|
|
{
|
|
AdHocCommandInfo commandInfo = commands.get(commandNode);
|
|
LocalCommand command;
|
|
try {
|
|
command = (LocalCommand) commandInfo.getCommandInstance();
|
|
command.setSessionID(sessionID);
|
|
command.setName(commandInfo.getName());
|
|
command.setNode(commandInfo.getNode());
|
|
}
|
|
catch (InstantiationException e) {
|
|
e.printStackTrace();
|
|
throw new XMPPException(new XMPPError(
|
|
XMPPError.Condition.interna_server_error));
|
|
}
|
|
catch (IllegalAccessException e) {
|
|
e.printStackTrace();
|
|
throw new XMPPException(new XMPPError(
|
|
XMPPError.Condition.interna_server_error));
|
|
}
|
|
return command;
|
|
}
|
|
|
|
/**
|
|
* Returns the registered commands of this command manager, which is related
|
|
* to a connection.
|
|
*
|
|
* @return the registered commands.
|
|
*/
|
|
private Collection<AdHocCommandInfo> getRegisteredCommands() {
|
|
return commands.values();
|
|
}
|
|
|
|
/**
|
|
* Stores ad-hoc command information.
|
|
*/
|
|
private static class AdHocCommandInfo {
|
|
|
|
private String node;
|
|
private String name;
|
|
private String ownerJID;
|
|
private LocalCommandFactory factory;
|
|
|
|
public AdHocCommandInfo(String node, String name, String ownerJID,
|
|
LocalCommandFactory factory)
|
|
{
|
|
this.node = node;
|
|
this.name = name;
|
|
this.ownerJID = ownerJID;
|
|
this.factory = factory;
|
|
}
|
|
|
|
public LocalCommand getCommandInstance() throws InstantiationException,
|
|
IllegalAccessException
|
|
{
|
|
return factory.getInstance();
|
|
}
|
|
|
|
public String getName() {
|
|
return name;
|
|
}
|
|
|
|
public String getNode() {
|
|
return node;
|
|
}
|
|
|
|
public String getOwnerJID() {
|
|
return ownerJID;
|
|
}
|
|
}
|
|
} |