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Smack/source/org/jivesoftware/smack/PacketReader.java
2004-07-17 17:50:18 +00:00

861 lines
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34 KiB
Java

/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright (C) 2002-2003 Jive Software. All rights reserved.
* ====================================================================
* The Jive Software License (based on Apache Software License, Version 1.1)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by
* Jive Software (http://www.jivesoftware.com)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Smack" and "Jive Software" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please
* contact webmaster@jivesoftware.com.
*
* 5. Products derived from this software may not be called "Smack",
* nor may "Smack" appear in their name, without prior written
* permission of Jive Software.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL JIVE SOFTWARE OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*/
package org.jivesoftware.smack;
import org.xmlpull.v1.*;
import java.util.*;
import java.util.List;
import java.io.ObjectInputStream;
import java.io.ByteArrayInputStream;
import org.jivesoftware.smack.packet.*;
import org.jivesoftware.smack.packet.XMPPError;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.util.*;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smack.provider.*;
/**
* Listens for XML traffic from the XMPP server and parses it into packet objects.
* The packet reader also manages all packet listeners and collectors.<p>
*
* @see PacketCollector
* @see PacketListener
* @author Matt Tucker
*/
class PacketReader {
/**
* Namespace used to store packet properties.
*/
private static final String PROPERTIES_NAMESPACE =
"http://www.jivesoftware.com/xmlns/xmpp/properties";
private Thread readerThread;
private Thread listenerThread;
private XMPPConnection connection;
private XmlPullParser parser;
private boolean done = false;
protected List collectors = new ArrayList();
private List listeners = new ArrayList();
protected List connectionListeners = new ArrayList();
private String connectionID = null;
private Object connectionIDLock = new Object();
protected PacketReader(XMPPConnection connection) {
this.connection = connection;
readerThread = new Thread() {
public void run() {
parsePackets();
}
};
readerThread.setName("Smack Packet Reader");
readerThread.setDaemon(true);
listenerThread = new Thread() {
public void run() {
processListeners();
}
};
listenerThread.setName("Smack Listener Processor");
listenerThread.setDaemon(true);
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance(
"org.xmlpull.mxp1.MXParserFactory", null);
factory.setNamespaceAware(true);
parser = factory.newPullParser();
parser.setInput(connection.reader);
}
catch (XmlPullParserException xppe) {
xppe.printStackTrace();
}
}
/**
* Creates a new packet collector for this reader. A packet filter determines
* which packets will be accumulated by the collector.
*
* @param packetFilter the packet filter to use.
* @return a new packet collector.
*/
public PacketCollector createPacketCollector(PacketFilter packetFilter) {
PacketCollector packetCollector = new PacketCollector(this, packetFilter);
return packetCollector;
}
/**
* Registers a packet listener with this reader. A packet filter determines
* which packets will be delivered to the listener.
*
* @param packetListener the packet listener to notify of new packets.
* @param packetFilter the packet filter to use.
*/
public void addPacketListener(PacketListener packetListener, PacketFilter packetFilter) {
ListenerWrapper wrapper = new ListenerWrapper(this, packetListener,
packetFilter);
synchronized (listeners) {
listeners.add(wrapper);
}
}
/**
* Removes a packet listener.
*
* @param packetListener the packet listener to remove.
*/
public void removePacketListener(PacketListener packetListener) {
synchronized (listeners) {
for (int i=0; i<listeners.size(); i++) {
ListenerWrapper wrapper = (ListenerWrapper)listeners.get(i);
if (wrapper != null && wrapper.packetListener.equals(packetListener)) {
listeners.set(i, null);
}
}
}
}
/**
* Starts the packet reader thread and returns once a connection to the server
* has been established. A connection will be attempted for a maximum of five
* seconds. An XMPPException will be thrown if the connection fails.
*
* @throws XMPPException if the server fails to send an opening stream back
* for more than five seconds.
*/
public void startup() throws XMPPException {
readerThread.start();
listenerThread.start();
// Wait for stream tag before returing. We'll wait a maximum of five seconds before
// giving up and throwing an error.
try {
synchronized(connectionIDLock) {
connectionIDLock.wait(5000);
}
}
catch (InterruptedException ie) { }
if (connectionID == null) {
throw new XMPPException("Connection failed. No response from server.");
}
else {
connection.connectionID = connectionID;
}
}
/**
* Shuts the packet reader down.
*/
public void shutdown() {
// Notify connection listeners of the connection closing if done hasn't already been set.
if (!done) {
synchronized (connectionListeners) {
for (Iterator i=connectionListeners.iterator(); i.hasNext(); ) {
ConnectionListener listener = (ConnectionListener)i.next();
listener.connectionClosed();
}
}
}
done = true;
}
/**
* Sends out a notification that there was an error with the connection
* and closes the connection.
*
* @param e the exception that causes the connection close event.
*/
void notifyConnectionError(Exception e) {
done = true;
connection.close();
// Notify connection listeners of the error.
synchronized (connectionListeners) {
for (Iterator i=connectionListeners.iterator(); i.hasNext(); ) {
ConnectionListener listener = (ConnectionListener)i.next();
listener.connectionClosedOnError(e);
}
}
}
/**
* Process listeners.
*/
private void processListeners() {
boolean processedPacket = false;
while (!done) {
synchronized (listeners) {
if (listeners.size() > 0) {
for (int i=listeners.size()-1; i>=0; i--) {
if (listeners.get(i) == null) {
listeners.remove(i);
}
}
}
}
processedPacket = false;
int size = listeners.size();
for (int i=0; i<size; i++) {
ListenerWrapper wrapper = (ListenerWrapper)listeners.get(i);
if (wrapper != null) {
processedPacket = processedPacket || wrapper.notifyListener();
}
}
if (!processedPacket) {
try {
Thread.sleep(100);
}
catch (InterruptedException ie) { }
}
}
}
/**
* Parse top-level packets in order to process them further.
*/
private void parsePackets() {
try {
int eventType = parser.getEventType();
do {
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("message")) {
processPacket(parseMessage(parser));
}
else if (parser.getName().equals("iq")) {
processPacket(parseIQ(parser));
}
else if (parser.getName().equals("presence")) {
processPacket(parsePresence(parser));
}
// We found an opening stream. Record information about it, then notify
// the connectionID lock so that the packet reader startup can finish.
else if (parser.getName().equals("stream")) {
// Ensure the correct jabber:client namespace is being used.
if ("jabber:client".equals(parser.getNamespace(null))) {
// Get the connection id.
for (int i=0; i<parser.getAttributeCount(); i++) {
if (parser.getAttributeName(i).equals("id")) {
// Save the connectionID and notify that we've gotten it.
connectionID = parser.getAttributeValue(i);
synchronized(connectionIDLock) {
connectionIDLock.notifyAll();
}
}
else if (parser.getAttributeName(i).equals("from")) {
// Use the server name that the server says that it is.
connection.host = parser.getAttributeValue(i);
}
}
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("stream")) {
// Close the connection.
connection.close();
}
}
eventType = parser.next();
} while (!done && eventType != XmlPullParser.END_DOCUMENT);
}
catch (Exception e) {
if (!done) {
// Close the connection and notify connection listeners of the
// error.
notifyConnectionError(e);
}
}
}
/**
* Processes a packet after it's been fully parsed by looping through the installed
* packet collectors and listeners and letting them examine the packet to see if
* they are a match with the filter.
*
* @param packet the packet to process.
*/
private void processPacket(Packet packet) {
if (packet == null) {
return;
}
// Remove all null values from the collectors list.
synchronized (collectors) {
for (int i=collectors.size()-1; i>=0; i--) {
if (collectors.get(i) == null) {
collectors.remove(i);
}
}
}
// Loop through all collectors and notify the appropriate ones.
int size = collectors.size();
for (int i=0; i<size; i++) {
PacketCollector collector = (PacketCollector)collectors.get(i);
if (collector != null) {
// Have the collector process the packet to see if it wants to handle it.
collector.processPacket(packet);
}
}
}
/**
* Parses an IQ packet.
*
* @param parser the XML parser, positioned at the start of an IQ packet.
* @return an IQ object.
* @throws Exception if an exception occurs while parsing the packet.
*/
private IQ parseIQ(XmlPullParser parser) throws Exception {
IQ iqPacket = null;
String id = parser.getAttributeValue("", "id");
String to = parser.getAttributeValue("", "to");
String from = parser.getAttributeValue("", "from");
IQ.Type type = IQ.Type.fromString(parser.getAttributeValue("", "type"));
XMPPError error = null;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
String namespace = parser.getNamespace();
if (elementName.equals("error")) {
error = parseError(parser);
}
else if (elementName.equals("query") && namespace.equals("jabber:iq:auth")) {
iqPacket = parseAuthentication(parser);
}
else if (elementName.equals("query") && namespace.equals("jabber:iq:roster")) {
iqPacket = parseRoster(parser);
}
else if (elementName.equals("query") && namespace.equals("jabber:iq:register")) {
iqPacket = parseRegistration(parser);
}
// Otherwise, see if there is a registered provider for
// this element name and namespace.
else {
Object provider = ProviderManager.getIQProvider(elementName, namespace);
if (provider != null) {
if (provider instanceof IQProvider) {
iqPacket = ((IQProvider)provider).parseIQ(parser);
}
else if (provider instanceof Class) {
iqPacket = (IQ)PacketParserUtils.parseWithIntrospection(elementName,
(Class)provider, parser);
}
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("iq")) {
done = true;
}
}
}
// Decide what to do when an IQ packet was not understood
if (iqPacket == null) {
if (IQ.Type.GET == type || IQ.Type.SET == type ) {
// If the IQ stanza is of type "get" or "set" containing a child element
// qualified by a namespace it does not understand, then answer an IQ of
// type "error" with code 501 ("feature-not-implemented")
iqPacket = new IQ() {
public String getChildElementXML() {
return null;
}
};
iqPacket.setPacketID(id);
iqPacket.setTo(from);
iqPacket.setFrom(to);
iqPacket.setType(IQ.Type.ERROR);
iqPacket.setError(new XMPPError(501, "feature-not-implemented"));
connection.sendPacket(iqPacket);
return null;
}
else {
// If an IQ packet wasn't created above, create an empty IQ packet.
iqPacket = new IQ() {
public String getChildElementXML() {
return null;
}
};
}
}
// Set basic values on the iq packet.
iqPacket.setPacketID(id);
iqPacket.setTo(to);
iqPacket.setFrom(from);
iqPacket.setType(type);
iqPacket.setError(error);
return iqPacket;
}
private Authentication parseAuthentication(XmlPullParser parser) throws Exception {
Authentication authentication = new Authentication();
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("username")) {
authentication.setUsername(parser.nextText());
}
else if (parser.getName().equals("password")) {
authentication.setPassword(parser.nextText());
}
else if (parser.getName().equals("digest")) {
authentication.setDigest(parser.nextText());
}
else if (parser.getName().equals("resource")) {
authentication.setResource(parser.nextText());
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("query")) {
done = true;
}
}
}
return authentication;
}
private RosterPacket parseRoster(XmlPullParser parser) throws Exception {
RosterPacket roster = new RosterPacket();
boolean done = false;
RosterPacket.Item item = null;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("item")) {
String jid = parser.getAttributeValue("", "jid");
String name = parser.getAttributeValue("", "name");
// Create packet.
item = new RosterPacket.Item(jid, name);
// Set status.
String ask = parser.getAttributeValue("", "ask");
RosterPacket.ItemStatus status = RosterPacket.ItemStatus.fromString(ask);
item.setItemStatus(status);
// Set type.
String subscription = parser.getAttributeValue("", "subscription");
RosterPacket.ItemType type = RosterPacket.ItemType.fromString(subscription);
item.setItemType(type);
}
if (parser.getName().equals("group")) {
String groupName = parser.nextText();
item.addGroupName(groupName);
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("item")) {
roster.addRosterItem(item);
}
if (parser.getName().equals("query")) {
done = true;
}
}
}
return roster;
}
private Registration parseRegistration(XmlPullParser parser) throws Exception {
Registration registration = new Registration();
Map fields = null;
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
if (parser.getName().equals("username")) {
registration.setUsername(parser.nextText());
}
else if (parser.getName().equals("password")) {
registration.setPassword(parser.nextText());
}
// Else if any other element that's in the jabber:iq:register namespace,
// attempt to parse it if it's in the form <name>value</name>.
else if (parser.getNamespace().equals("jabber:iq:register")) {
String name = parser.getName();
if (parser.next() == XmlPullParser.TEXT) {
String value = parser.getText();
// Ignore instructions, but anything else should be added to the map.
if (!name.equals("instructions")) {
if (fields == null) {
fields = new HashMap();
}
fields.put(name, value);
}
else {
registration.setInstructions(value);
}
}
}
// Otherwise, it must be a packet extension.
else {
registration.addExtension(
PacketParserUtils.parsePacketExtension(
parser.getName(),
parser.getNamespace(),
parser));
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("query")) {
done = true;
}
}
}
registration.setAttributes(fields);
return registration;
}
/**
* Parses error sub-packets.
*
* @param parser the XML parser.
* @return an error sub-packet.
* @throws Exception if an exception occurs while parsing the packet.
*/
private XMPPError parseError(XmlPullParser parser) throws Exception {
String errorCode = null;
String message = null;
for (int i=0; i<parser.getAttributeCount(); i++) {
if (parser.getAttributeName(i).equals("code")) {
errorCode = parser.getAttributeValue("", "code");
}
}
// Get the error text in a safe way since we are not sure about the error message format
try {
message = parser.nextText();
}
catch (XmlPullParserException ex) {}
while (true) {
if (parser.getEventType() == XmlPullParser.END_TAG && parser.getName().equals("error")) {
break;
}
parser.next();
}
return new XMPPError(Integer.parseInt(errorCode), message);
}
/**
* Parses a message packet.
*
* @param parser the XML parser, positioned at the start of a message packet.
* @return a Message packet.
* @throws Exception if an exception occurs while parsing the packet.
*/
private Packet parseMessage(XmlPullParser parser) throws Exception {
Message message = new Message();
String id = parser.getAttributeValue("", "id");
message.setPacketID(id == null ? Packet.ID_NOT_AVAILABLE : id);
message.setTo(parser.getAttributeValue("", "to"));
message.setFrom(parser.getAttributeValue("", "from"));
message.setType(Message.Type.fromString(parser.getAttributeValue("", "type")));
// Parse sub-elements. We include extra logic to make sure the values
// are only read once. This is because it's possible for the names to appear
// in arbitrary sub-elements.
boolean done = false;
String subject = null;
String body = null;
String thread = null;
Map properties = null;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
String namespace = parser.getNamespace();
if (elementName.equals("subject")) {
if (subject == null) {
subject = parser.nextText();
}
}
else if (elementName.equals("body")) {
if (body == null) {
body = parser.nextText();
}
}
else if (elementName.equals("thread")) {
if (thread == null) {
thread = parser.nextText();
}
}
else if (elementName.equals("error")) {
message.setError(parseError(parser));
}
else if (elementName.equals("properties") &&
namespace.equals(PROPERTIES_NAMESPACE))
{
properties = parseProperties(parser);
}
// Otherwise, it must be a packet extension.
else {
message.addExtension(
PacketParserUtils.parsePacketExtension(elementName, namespace, parser));
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("message")) {
done = true;
}
}
}
message.setSubject(subject);
message.setBody(body);
message.setThread(thread);
// Set packet properties.
if (properties != null) {
for (Iterator i=properties.keySet().iterator(); i.hasNext(); ) {
String name = (String)i.next();
message.setProperty(name, properties.get(name));
}
}
return message;
}
/**
* Parses a presence packet.
*
* @param parser the XML parser, positioned at the start of a presence packet.
* @return a Presence packet.
* @throws Exception if an exception occurs while parsing the packet.
*/
private Presence parsePresence(XmlPullParser parser) throws Exception {
Presence.Type type = Presence.Type.fromString(parser.getAttributeValue("", "type"));
Presence presence = new Presence(type);
presence.setTo(parser.getAttributeValue("", "to"));
presence.setFrom(parser.getAttributeValue("", "from"));
String id = parser.getAttributeValue("", "id");
presence.setPacketID(id == null ? Packet.ID_NOT_AVAILABLE : id);
// Parse sub-elements
boolean done = false;
while (!done) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
String namespace = parser.getNamespace();
if (elementName.equals("status")) {
presence.setStatus(parser.nextText());
}
else if (elementName.equals("priority")) {
try {
int priority = Integer.parseInt(parser.nextText());
presence.setPriority(priority);
}
catch (NumberFormatException nfe) { }
}
else if (elementName.equals("show")) {
presence.setMode(Presence.Mode.fromString(parser.nextText()));
}
else if (elementName.equals("error")) {
presence.setError(parseError(parser));
}
else if (elementName.equals("properties") &&
namespace.equals(PROPERTIES_NAMESPACE))
{
Map properties = parseProperties(parser);
// Set packet properties.
for (Iterator i=properties.keySet().iterator(); i.hasNext(); ) {
String name = (String)i.next();
presence.setProperty(name, properties.get(name));
}
}
// Otherwise, it must be a packet extension.
else {
presence.addExtension(
PacketParserUtils.parsePacketExtension(elementName, namespace, parser));
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("presence")) {
done = true;
}
}
}
return presence;
}
/**
* Parse a properties sub-packet. If any errors occur while de-serializing Java object
* properties, an exception will be printed and not thrown since a thrown
* exception will shut down the entire connection. ClassCastExceptions will occur
* when both the sender and receiver of the packet don't have identical versions
* of the same class.
*
* @param parser the XML parser, positioned at the start of a properties sub-packet.
* @return a map of the properties.
* @throws Exception if an error occurs while parsing the properties.
*/
private Map parseProperties(XmlPullParser parser) throws Exception {
Map properties = new HashMap();
while (true) {
int eventType = parser.next();
if (eventType == XmlPullParser.START_TAG && parser.getName().equals("property")) {
// Parse a property
boolean done = false;
String name = null;
String type = null;
String valueText = null;
Object value = null;
while (!done) {
eventType = parser.next();
if (eventType == XmlPullParser.START_TAG) {
String elementName = parser.getName();
String namespace = parser.getNamespace();
if (elementName.equals("name")) {
name = parser.nextText();
}
else if (elementName.equals("value")) {
type = parser.getAttributeValue("", "type");
valueText = parser.nextText();
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("property")) {
if ("integer".equals(type)) {
value = new Integer(valueText);
}
else if ("long".equals(type)) {
value = new Long(valueText);
}
else if ("float".equals(type)) {
value = new Float(valueText);
}
else if ("double".equals(type)) {
value = new Double(valueText);
}
else if ("boolean".equals(type)) {
value = new Boolean(valueText);
}
else if ("string".equals(type)) {
value = valueText;
}
else if ("java-object".equals(type)) {
try {
byte [] bytes = StringUtils.decodeBase64(valueText);
ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes));
value = in.readObject();
}
catch (Exception e) {
e.printStackTrace();
}
}
if (name != null && value != null) {
properties.put(name, value);
}
done = true;
}
}
}
}
else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals("properties")) {
break;
}
}
}
return properties;
}
/**
* A wrapper class to associate a packet collector with a listener.
*/
private static class ListenerWrapper {
private PacketListener packetListener;
private PacketCollector packetCollector;
public ListenerWrapper(PacketReader packetReader, PacketListener packetListener,
PacketFilter packetFilter)
{
this.packetListener = packetListener;
this.packetCollector = new PacketCollector(packetReader, packetFilter);
}
public boolean equals(Object object) {
if (object == null) {
return false;
}
if (object instanceof ListenerWrapper) {
return ((ListenerWrapper)object).packetListener.equals(this.packetListener);
}
else if (object instanceof PacketListener) {
return object.equals(this.packetListener);
}
return false;
}
public boolean notifyListener() {
Packet packet = packetCollector.pollResult();
if (packet != null) {
packetListener.processPacket(packet);
return true;
}
else {
return false;
}
}
public void cancel() {
packetCollector.cancel();
packetCollector = null;
packetListener = null;
}
}
}