org.jivesoftware.smackx.commands.AdHocCommandManager Maven / Gradle / Ivy
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Smack extensions.
Classes and methods that implement support for the various XMPP XEPs
(Multi-User Chat, PubSub, …) and other XMPP extensions.
/**
*
* Copyright 2005-2008 Jive Software.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.commands;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jivesoftware.smack.ConnectionCreationListener;
import org.jivesoftware.smack.Manager;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.SmackException.NoResponseException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPConnectionRegistry;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.XMPPException.XMPPErrorException;
import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.StanzaError;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smackx.commands.AdHocCommand.Action;
import org.jivesoftware.smackx.commands.AdHocCommand.Status;
import org.jivesoftware.smackx.commands.packet.AdHocCommandData;
import org.jivesoftware.smackx.disco.AbstractNodeInformationProvider;
import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
import org.jivesoftware.smackx.disco.packet.DiscoverInfo;
import org.jivesoftware.smackx.disco.packet.DiscoverItems;
import org.jivesoftware.smackx.xdata.form.FillableForm;
import org.jivesoftware.smackx.xdata.packet.DataForm;
import org.jxmpp.jid.Jid;
/**
* An AdHocCommandManager is responsible for keeping the list of available
* commands offered by a service and for processing commands requests.
*
* Pass in an XMPPConnection instance to
* {@link #getAddHocCommandsManager(XMPPConnection)} in order to
* get an instance of this class.
*
* @author Gabriel Guardincerri
*/
public final class AdHocCommandManager extends Manager {
public static final String NAMESPACE = "http://jabber.org/protocol/commands";
private static final Logger LOGGER = Logger.getLogger(AdHocCommandManager.class.getName());
/**
* The session time out in seconds.
*/
private static final int SESSION_TIMEOUT = 2 * 60;
/**
* Map an XMPPConnection with it AdHocCommandManager. This map have a key-value
* pair for every active connection.
*/
private static final Map instances = new WeakHashMap<>();
/**
* Register the listener for all the connection creations. When a new
* connection is created a new AdHocCommandManager is also created and
* related to that connection.
*/
static {
XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
@Override
public void connectionCreated(XMPPConnection connection) {
getAddHocCommandsManager(connection);
}
});
}
/**
* Returns the AdHocCommandManager related to the
* connection.
*
* @param connection the XMPP connection.
* @return the AdHocCommandManager associated with the connection.
*/
public static synchronized AdHocCommandManager getAddHocCommandsManager(XMPPConnection connection) {
AdHocCommandManager ahcm = instances.get(connection);
if (ahcm == null) {
ahcm = new AdHocCommandManager(connection);
instances.put(connection, ahcm);
}
return ahcm;
}
/**
* Map a command node with its AdHocCommandInfo. Note: Key=command node,
* Value=command. Command node matches the node attribute sent by command
* requesters.
*/
private final Map commands = new ConcurrentHashMap<>();
/**
* Map a command session ID with the instance LocalCommand. The LocalCommand
* is the an objects that has all the information of the current state of
* the command execution. Note: Key=session ID, Value=LocalCommand. Session
* ID matches the sessionid attribute sent by command responders.
*/
private final Map executingCommands = new ConcurrentHashMap<>();
private final ServiceDiscoveryManager serviceDiscoveryManager;
private AdHocCommandManager(XMPPConnection connection) {
super(connection);
this.serviceDiscoveryManager = ServiceDiscoveryManager.getInstanceFor(connection);
// Add the feature to the service discovery manage to show that this
// connection supports the AdHoc-Commands protocol.
// This information will be used when another client tries to
// discover whether this client supports AdHoc-Commands or not.
ServiceDiscoveryManager.getInstanceFor(connection).addFeature(
NAMESPACE);
// Set the NodeInformationProvider that will provide information about
// which AdHoc-Commands are registered, whenever a disco request is
// received
ServiceDiscoveryManager.getInstanceFor(connection)
.setNodeInformationProvider(NAMESPACE,
new AbstractNodeInformationProvider() {
@Override
public List getNodeItems() {
List answer = new ArrayList<>();
Collection commandsList = getRegisteredCommands();
for (AdHocCommandInfo info : commandsList) {
DiscoverItems.Item item = new DiscoverItems.Item(
info.getOwnerJID());
item.setName(info.getName());
item.setNode(info.getNode());
answer.add(item);
}
return answer;
}
});
// The packet listener and the filter for processing some AdHoc Commands
// Packets
connection.registerIQRequestHandler(new AbstractIqRequestHandler(AdHocCommandData.ELEMENT,
AdHocCommandData.NAMESPACE, IQ.Type.set, Mode.async) {
@Override
public IQ handleIQRequest(IQ iqRequest) {
AdHocCommandData requestData = (AdHocCommandData) iqRequest;
try {
return processAdHocCommand(requestData);
}
catch (InterruptedException | NoResponseException | NotConnectedException e) {
LOGGER.log(Level.INFO, "processAdHocCommand threw exception", e);
return null;
}
}
});
}
/**
* Registers a new command with this command manager, which is related to a
* connection. The node is an unique identifier of that command for
* the connection related to this command manager. The name is the
* human readable name of the command. The class is the class of
* the command, which must extend {@link LocalCommand} and have a default
* constructor.
*
* @param node the unique identifier of the command.
* @param name the human readable name of the command.
* @param clazz the class of the command, which must extend {@link LocalCommand}.
*/
public void registerCommand(String node, String name, final Class clazz) {
registerCommand(node, name, new LocalCommandFactory() {
@Override
public LocalCommand getInstance() throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException {
return clazz.getConstructor().newInstance();
}
});
}
/**
* Registers a new command with this command manager, which is related to a
* connection. The node is an unique identifier of that
* command for the connection related to this command manager. The name
* is the human readable name of the command. The factory generates
* new instances of the command.
*
* @param node the unique identifier of the command.
* @param name the human readable name of the command.
* @param factory a factory to create new instances of the command.
*/
public void registerCommand(String node, final String name, LocalCommandFactory factory) {
AdHocCommandInfo commandInfo = new AdHocCommandInfo(node, name, connection().getUser(), factory);
commands.put(node, commandInfo);
// Set the NodeInformationProvider that will provide information about
// the added command
serviceDiscoveryManager.setNodeInformationProvider(node,
new AbstractNodeInformationProvider() {
@Override
public List getNodeFeatures() {
List answer = new ArrayList<>();
answer.add(NAMESPACE);
// TODO: check if this service is provided by the
// TODO: current connection.
answer.add("jabber:x:data");
return answer;
}
@Override
public List getNodeIdentities() {
List answer = new ArrayList<>();
DiscoverInfo.Identity identity = new DiscoverInfo.Identity(
"automation", name, "command-node");
answer.add(identity);
return answer;
}
});
}
/**
* Discover the commands of an specific JID. The jid 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.
* @throws SmackException if there was no response from the server.
* @throws InterruptedException if the calling thread was interrupted.
*/
public DiscoverItems discoverCommands(Jid jid) throws XMPPException, SmackException, InterruptedException {
return serviceDiscoveryManager.discoverItems(jid, NAMESPACE);
}
/**
* 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(Jid jid, String node) {
return new RemoteCommand(connection(), node, jid);
}
/**
* Process the AdHoc-Command stanza that request the execution of some
* action of a command. If this is the first request, this method checks,
* before executing the command, if:
*
* - The requested command exists
* - The requester has permissions to execute it
* - The command has more than one stage, if so, it saves the command and
* session ID for further use
*
*
*
*
* If this is not the first request, this method checks, before executing
* the command, if:
*
* - The session ID of the request was stored
* - The session life do not exceed the time out
* - The action to execute is one of the available actions
*
*
* @param requestData TODO javadoc me please
* the stanza to process.
* @throws NotConnectedException if the XMPP connection is not connected.
* @throws NoResponseException if there was no response from the remote entity.
* @throws InterruptedException if the calling thread was interrupted.
*/
private IQ processAdHocCommand(AdHocCommandData requestData) throws NoResponseException, NotConnectedException, InterruptedException {
// Creates the response with the corresponding data
AdHocCommandData response = new AdHocCommandData();
response.setTo(requestData.getFrom());
response.setStanzaId(requestData.getStanzaId());
response.setNode(requestData.getNode());
response.setId(requestData.getTo());
String sessionId = requestData.getSessionID();
String commandNode = requestData.getNode();
if (sessionId == null) {
// A new execution request has been received. Check that the
// command exists
if (!commands.containsKey(commandNode)) {
// Requested command does not exist so return
// item_not_found error.
return respondError(response, StanzaError.Condition.item_not_found);
}
// Create new session ID
sessionId = StringUtils.randomString(15);
try {
// Create a new instance of the command with the
// corresponding sessionid
LocalCommand command;
try {
command = newInstanceOfCmd(commandNode, sessionId);
}
catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException | NoSuchMethodException | SecurityException e) {
StanzaError xmppError = StanzaError.getBuilder()
.setCondition(StanzaError.Condition.internal_server_error)
.setDescriptiveEnText(e.getMessage())
.build();
return respondError(response, xmppError);
}
response.setType(IQ.Type.result);
command.setData(response);
// Check that the requester has enough permission.
// Answer forbidden error if requester permissions are not
// enough to execute the requested command
if (!command.hasPermission(requestData.getFrom())) {
return respondError(response, StanzaError.Condition.forbidden);
}
Action action = requestData.getAction();
// If the action is unknown then respond an error.
if (action != null && action.equals(Action.unknown)) {
return respondError(response, StanzaError.Condition.bad_request,
AdHocCommand.SpecificErrorCondition.malformedAction);
}
// If the action is not execute, then it is an invalid action.
if (action != null && !action.equals(Action.execute)) {
return respondError(response, StanzaError.Condition.bad_request,
AdHocCommand.SpecificErrorCondition.badAction);
}
// Increase the state number, so the command knows in witch
// stage it is
command.incrementStage();
// Executes the command
command.execute();
if (command.isLastStage()) {
// If there is only one stage then the command is completed
response.setStatus(Status.completed);
}
else {
// Else it is still executing, and is registered to be
// available for the next call
response.setStatus(Status.executing);
executingCommands.put(sessionId, command);
// See if the session sweeper thread is scheduled. If not, start it.
maybeWindUpSessionSweeper();
}
// Sends the response packet
return response;
}
catch (XMPPErrorException e) {
// If there is an exception caused by the next, complete,
// prev or cancel method, then that error is returned to the
// requester.
StanzaError error = e.getStanzaError();
// 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 (StanzaError.Type.CANCEL.equals(error.getType())) {
response.setStatus(Status.canceled);
executingCommands.remove(sessionId);
}
return respondError(response, error);
}
}
else {
LocalCommand command = executingCommands.get(sessionId);
// Check that a command exists for the specified sessionID
// This also handles if the command was removed in the meanwhile
// of getting the key and the value of the map.
if (command == null) {
return respondError(response, StanzaError.Condition.bad_request,
AdHocCommand.SpecificErrorCondition.badSessionid);
}
// Check if the Session data has expired (default is 10 minutes)
long creationStamp = command.getCreationDate();
if (System.currentTimeMillis() - creationStamp > SESSION_TIMEOUT * 1000) {
// Remove the expired session
executingCommands.remove(sessionId);
// Answer a not_allowed error (session-expired)
return respondError(response, StanzaError.Condition.not_allowed,
AdHocCommand.SpecificErrorCondition.sessionExpired);
}
/*
* Since the requester could send two requests for the same
* executing command i.e. the same session id, all the execution of
* the action must be synchronized to avoid inconsistencies.
*/
synchronized (command) {
Action action = requestData.getAction();
// If the action is unknown the respond an error
if (action != null && action.equals(Action.unknown)) {
return respondError(response, StanzaError.Condition.bad_request,
AdHocCommand.SpecificErrorCondition.malformedAction);
}
// 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)) {
return respondError(response, StanzaError.Condition.bad_request,
AdHocCommand.SpecificErrorCondition.badAction);
}
try {
// TODO: Check that all the required 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();
DataForm dataForm = requestData.getForm();
command.next(new FillableForm(dataForm));
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();
DataForm dataForm = requestData.getForm();
command.complete(new FillableForm(dataForm));
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);
}
return response;
}
catch (XMPPErrorException e) {
// If there is an exception caused by the next, complete,
// prev or cancel method, then that error is returned to the
// requester.
StanzaError error = e.getStanzaError();
// 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 (StanzaError.Type.CANCEL.equals(error.getType())) {
response.setStatus(Status.canceled);
executingCommands.remove(sessionId);
}
return respondError(response, error);
}
}
}
}
private boolean sessionSweeperScheduled;
private void sessionSweeper() {
final long currentTime = System.currentTimeMillis();
synchronized (this) {
for (Iterator> it = executingCommands.entrySet().iterator(); it.hasNext();) {
Entry entry = it.next();
LocalCommand command = entry.getValue();
long creationStamp = command.getCreationDate();
// Check if the Session data has expired (default is 10 minutes)
// To remove it from the session list it waits for the double of
// the of time out time. This is to let
// the requester know why his execution request is
// not accepted. If the session is removed just
// after the time out, then once the user requests to
// continue the execution he will received an
// invalid session error and not a time out error.
if (currentTime - creationStamp > SESSION_TIMEOUT * 1000 * 2) {
// Remove the expired session
it.remove();
}
}
sessionSweeperScheduled = false;
}
if (!executingCommands.isEmpty()) {
maybeWindUpSessionSweeper();
}
};
private synchronized void maybeWindUpSessionSweeper() {
if (sessionSweeperScheduled) {
return;
}
sessionSweeperScheduled = true;
schedule(this::sessionSweeper, 10, TimeUnit.SECONDS);
}
/**
* Responds an error with an specific condition.
*
* @param response the response to send.
* @param condition the condition of the error.
* @throws NotConnectedException if the XMPP connection is not connected.
*/
private static IQ respondError(AdHocCommandData response,
StanzaError.Condition condition) {
return respondError(response, StanzaError.getBuilder(condition).build());
}
/**
* 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.
* @throws NotConnectedException if the XMPP connection is not connected.
*/
private static IQ respondError(AdHocCommandData response, StanzaError.Condition condition,
AdHocCommand.SpecificErrorCondition specificCondition) {
StanzaError error = StanzaError.getBuilder(condition)
.addExtension(new AdHocCommandData.SpecificError(specificCondition))
.build();
return respondError(response, error);
}
/**
* Responds an error with an specific error.
*
* @param response the response to send.
* @param error the error to send.
* @throws NotConnectedException if the XMPP connection is not connected.
*/
private static IQ respondError(AdHocCommandData response, StanzaError error) {
response.setType(IQ.Type.error);
response.setError(error);
return 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 XMPPErrorException if there is problem creating the new instance.
* @throws SecurityException if there was a security violation.
* @throws NoSuchMethodException if no such method is declared
* @throws InvocationTargetException if a reflection-based method or constructor invocation threw.
* @throws IllegalArgumentException if an illegal argument was given.
* @throws IllegalAccessException
* @throws InstantiationException
*/
private LocalCommand newInstanceOfCmd(String commandNode, String sessionID)
throws XMPPErrorException, InstantiationException, IllegalAccessException, IllegalArgumentException,
InvocationTargetException, NoSuchMethodException, SecurityException {
AdHocCommandInfo commandInfo = commands.get(commandNode);
LocalCommand command = commandInfo.getCommandInstance();
command.setSessionID(sessionID);
command.setName(commandInfo.getName());
command.setNode(commandInfo.getNode());
return command;
}
/**
* Returns the registered commands of this command manager, which is related
* to a connection.
*
* @return the registered commands.
*/
private Collection getRegisteredCommands() {
return commands.values();
}
/**
* Stores ad-hoc command information.
*/
private static final class AdHocCommandInfo {
private String node;
private String name;
private final Jid ownerJID;
private LocalCommandFactory factory;
private AdHocCommandInfo(String node, String name, Jid ownerJID,
LocalCommandFactory factory) {
this.node = node;
this.name = name;
this.ownerJID = ownerJID;
this.factory = factory;
}
public LocalCommand getCommandInstance() throws InstantiationException,
IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException {
return factory.getInstance();
}
public String getName() {
return name;
}
public String getNode() {
return node;
}
public Jid getOwnerJID() {
return ownerJID;
}
}
}
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