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git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@10453 b35dd754-fafc-0310-a699-88a17e54d16e
725 lines
29 KiB
Java
Executable file
725 lines
29 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 2005-2007 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.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.util.ArrayList;
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import java.util.Collection;
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import java.util.List;
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import java.util.Map;
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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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* Typically, instances of this class are private to the service offering ad-hoc
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* commands.
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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 final static String discoNamespace = "http://jabber.org/protocol/commands";
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private final static String discoNode = discoNamespace;
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/**
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* The session time out in seconds.
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*/
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public static int SESSION_TIMEOUT = 2 * 60;
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/**
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* Map a XMPPConnection with it AdHocCommandManager. This map have a pair
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* key-value for every active connection.
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*/
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private static Map<XMPPConnection, AdHocCommandManager> instances = new ConcurrentHashMap<XMPPConnection, AdHocCommandManager>();
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private static Thread sessionsSweeper;
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/**
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* The XMPPConnection that this instances of AdHocCommandManager manages
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*/
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private XMPPConnection 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 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 Map<String, LocalCommand> executingCommands = new ConcurrentHashMap<String, LocalCommand>();
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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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XMPPConnection
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.addConnectionCreationListener(new ConnectionCreationListener() {
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public void connectionCreated(XMPPConnection connection) {
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new AdHocCommandManager(connection);
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}
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});
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}
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private AdHocCommandManager(XMPPConnection connection) {
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super();
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this.connection = connection;
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init();
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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
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* @return
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*/
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public static AdHocCommandManager getAddHocCommandsManager(
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XMPPConnection connection) {
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return instances.get(connection);
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}
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/**
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* <li>Adds listeners to the connection</li>
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* <li>Registers the ad-hoc command feature to the ServiceDiscoveryManager</li>
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* <li>Registers the items of the feature</li>
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* <li>Adds packet listeners to handle execution requests</li>
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* <li>Creates and start the session sweeper</li>
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*
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*/
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private void init() {
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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 a listener to the connection that removes the registered instance
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// when the connection is closed
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connection.addConnectionListener(new ConnectionListener() {
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public void connectionClosed() {
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// Unregister this instance since the connection has been closed
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instances.remove(connection);
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}
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public void connectionClosedOnError(Exception e) {
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// Unregister this instance since the connection has been closed
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instances.remove(connection);
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}
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public void reconnectionSuccessful() {
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// Register this instance since the connection has been
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// reestablished
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instances.put(connection, AdHocCommandManager.this);
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}
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public void reconnectingIn(int seconds) {
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// Nothing to do
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}
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public void reconnectionFailed(Exception e) {
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// Nothing to do
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}
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});
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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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discoNamespace);
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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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AdHocCommandManager adHocCommandManager = AdHocCommandManager
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.getAddHocCommandsManager(connection);
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List<DiscoverItems.Item> answer = new ArrayList<DiscoverItems.Item>();
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Collection<AdHocCommandInfo> commandsList = adHocCommandManager
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.getRegisteredCommands(connection);
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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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});
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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 = 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.getCreationStamp();
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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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} catch (InterruptedException ie) {
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}
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}
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}
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});
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sessionsSweeper.start();
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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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* <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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*
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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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* <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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*
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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.increaseStage();
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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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} 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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}
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// Sends the response packet
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connection.sendPacket(response);
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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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} 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.getCreationStamp();
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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)) {
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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 user didn't specify an action or specify the execute
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// action then follow the actual default execute action
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if (action == null || Action.execute.equals(action)) {
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action = command.getExecuteAction();
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}
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// Check that the specified action was previously
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// offered
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if (!command.isValidAction(action)) {
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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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try {
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// TODO Check that all the requierd fields of the form are
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// filled, if not throw an exception. This will simplify the
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// construction of new commands
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// Since all errors were passed, the response is now a
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// result
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response.setType(IQ.Type.RESULT);
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// Set the new data to the command.
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command.setData(response);
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if (Action.next.equals(action)) {
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command.increaseStage();
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command.next(new Form(requestData.getForm()));
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if (command.isLastStage()) {
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// If it is the last stage then the command is
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// completed
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response.setStatus(Status.completed);
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} else {
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// Otherwise it is still executing
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response.setStatus(Status.executing);
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}
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} else if (Action.complete.equals(action)) {
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command.increaseStage();
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command.complete(new Form(requestData.getForm()));
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response.setStatus(Status.completed);
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// Remove the completed session
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executingCommands.remove(sessionId);
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} else if (Action.prev.equals(action)) {
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command.decreaseStage();
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command.prev();
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} else if (Action.cancel.equals(action)) {
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command.cancel();
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response.setStatus(Status.canceled);
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// Remove the canceled session
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executingCommands.remove(sessionId);
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}
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connection.sendPacket(response);
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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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}
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}
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/**
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* Responds an error with an specific condition.
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*
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* @param response
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* the response to send
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* @param condition
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* the condition of the error
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*/
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private void respondError(AdHocCommandData response,
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XMPPError.Condition condition) {
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respondError(response, new XMPPError(condition));
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}
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/**
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* Responds an error with an specific condition.
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*
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* @param response
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* the response to send
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* @param condition
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* the condition of the error
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*/
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private void respondError(AdHocCommandData response,
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XMPPError.Condition condition,
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AdHocCommand.SpecificErrorCondition specificCondition) {
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XMPPError error = new XMPPError(condition);
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error
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.addExtension(new AdHocCommandData.SpecificError(
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specificCondition));
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respondError(response, error);
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}
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/**
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* Responds an error with an specific error.
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*
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* @param response
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* the response to send
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* @param condition
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* the condition of the error
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*/
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private void respondError(AdHocCommandData response, XMPPError error) {
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response.setType(IQ.Type.ERROR);
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response.setError(error);
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connection.sendPacket(response);
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}
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/**
|
|
* 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 {
|
|
// TODO Evaluate the possibility of using a factory for creating the new
|
|
// instances.
|
|
AdHocCommandInfo commandInfo = commands.get(commandNode);
|
|
LocalCommand command = null;
|
|
try {
|
|
command = (LocalCommand) commandInfo.getCmdClass().newInstance();
|
|
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.
|
|
*
|
|
* @param connection
|
|
* @return
|
|
*/
|
|
private Collection<AdHocCommandInfo> getRegisteredCommands(
|
|
XMPPConnection connection) {
|
|
return commands.values();
|
|
}
|
|
|
|
/**
|
|
* Register a new command to this command manager, which is related to a
|
|
* connection. The <code>node</code> is an unique identifier of that
|
|
* command for the connection related to this command manager. The
|
|
* <code>name</name> is the human readable name of the command.
|
|
* The <code>class</code> is the class of the command
|
|
* @param node the unique identifier of the command.
|
|
* @param name the human readable name of the command.
|
|
* @param clazz the class of the command.
|
|
*/
|
|
public void registerCommand(String node, final String name, Class clazz) {
|
|
AdHocCommandInfo commandInfo = new AdHocCommandInfo(node, name,
|
|
connection.getUser(), clazz);
|
|
|
|
commands.put(node, commandInfo);
|
|
// Set the NodeInformationProvider that will provide information about
|
|
// the added command
|
|
ServiceDiscoveryManager.getInstanceFor(connection)
|
|
.setNodeInformationProvider(node,
|
|
new NodeInformationProvider() {
|
|
public List<DiscoverItems.Item> getNodeItems() {
|
|
return null;
|
|
}
|
|
|
|
public List<String> getNodeFeatures() {
|
|
List<String> answer = new ArrayList<String>();
|
|
answer
|
|
.add("http://jabber.org/protocol/commands");
|
|
// TODO check if this service is provided by the
|
|
// current connection.
|
|
answer.add("jabber:x:data");
|
|
return answer;
|
|
}
|
|
|
|
public List<DiscoverInfo.Identity> getNodeIdentities() {
|
|
List<DiscoverInfo.Identity> answer = new ArrayList<DiscoverInfo.Identity>();
|
|
DiscoverInfo.Identity identity = new DiscoverInfo.Identity(
|
|
"automation", name);
|
|
identity.setType("command-node");
|
|
answer.add(identity);
|
|
return answer;
|
|
}
|
|
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Discover the commands of an specific JID. The <code>jid</code> is a
|
|
* full JID
|
|
*
|
|
* @param jid
|
|
* the full JID to retrieve the commands for.
|
|
* @return the discovered items
|
|
* @throws XMPPException
|
|
* if the operation failed for some reason.
|
|
*/
|
|
public DiscoverItems discoverCommands(String jid) throws XMPPException {
|
|
ServiceDiscoveryManager serviceDiscoveryManager = ServiceDiscoveryManager
|
|
.getInstanceFor(connection);
|
|
return serviceDiscoveryManager.discoverItems(jid, discoNode);
|
|
}
|
|
|
|
/**
|
|
* Publish the commands to an specific JID.
|
|
*
|
|
* @param jid
|
|
* the full JID to publish the commands to.
|
|
* @throws XMPPException
|
|
* if the operation failed for some reason.
|
|
*/
|
|
public void publishCommands(String jid) throws XMPPException {
|
|
ServiceDiscoveryManager serviceDiscoveryManager = ServiceDiscoveryManager
|
|
.getInstanceFor(connection);
|
|
|
|
// Collects the commands to publish as items
|
|
AdHocCommandManager adHocCommandManager = AdHocCommandManager
|
|
.getAddHocCommandsManager(connection);
|
|
DiscoverItems discoverItems = new DiscoverItems();
|
|
Collection<AdHocCommandInfo> xCommandsList = adHocCommandManager
|
|
.getRegisteredCommands(connection);
|
|
|
|
for (AdHocCommandInfo info : xCommandsList) {
|
|
DiscoverItems.Item item = new DiscoverItems.Item(info.getOwnerJID());
|
|
item.setName(info.getName());
|
|
item.setNode(info.getNode());
|
|
discoverItems.addItem(item);
|
|
}
|
|
|
|
serviceDiscoveryManager.publishItems(jid, discoNode, discoverItems);
|
|
}
|
|
|
|
/**
|
|
* Returns a command that represents an instance of a command in a remote
|
|
* host. It is used to execute remote commands. The concept is similar to
|
|
* RMI. Every invocation on this command is equivalent to an invocation in
|
|
* the remote command.
|
|
*
|
|
* @param jid
|
|
* the full JID of the host of the remote command
|
|
* @param node
|
|
* the identifier of the command
|
|
* @return a local instance equivalent to the remote command.
|
|
*/
|
|
public RemoteCommand getRemoteCommand(String jid, String node) {
|
|
return new RemoteCommand(connection, node, jid);
|
|
}
|
|
|
|
/**
|
|
* The ad-hoc command information.
|
|
*
|
|
* @author Gabriel
|
|
*
|
|
*/
|
|
private static class AdHocCommandInfo {
|
|
|
|
private String node;
|
|
|
|
private String name;
|
|
|
|
private String ownerJID;
|
|
|
|
private Class cmdClass;
|
|
|
|
public AdHocCommandInfo(String node, String name, String ownerJID,
|
|
Class cmdClass) {
|
|
this.node = node;
|
|
this.name = name;
|
|
this.ownerJID = ownerJID;
|
|
this.cmdClass = cmdClass;
|
|
}
|
|
|
|
public Class getCmdClass() {
|
|
return cmdClass;
|
|
}
|
|
|
|
public String getName() {
|
|
return name;
|
|
}
|
|
|
|
public String getNode() {
|
|
return node;
|
|
}
|
|
|
|
public String getOwnerJID() {
|
|
return ownerJID;
|
|
}
|
|
}
|
|
}
|