mirror of
https://github.com/vanitasvitae/Smack.git
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469b5c2a0a
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@6341 b35dd754-fafc-0310-a699-88a17e54d16e
467 lines
No EOL
19 KiB
Java
467 lines
No EOL
19 KiB
Java
/**
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* $RCSfile$
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* $Revision$
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* $Date$
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*
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* Copyright 2003-2004 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.smack.util;
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import org.jivesoftware.smack.packet.*;
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import org.jivesoftware.smack.provider.PacketExtensionProvider;
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import org.jivesoftware.smack.provider.ProviderManager;
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import org.xmlpull.v1.XmlPullParser;
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import java.beans.PropertyDescriptor;
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import java.io.ByteArrayInputStream;
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import java.io.ObjectInputStream;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* Utility class that helps to parse packets. Any parsing packets method that must be shared
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* between many clients must be placed in this utility class.
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*
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* @author Gaston Dombiak
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*/
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public class PacketParserUtils {
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/**
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* Namespace used to store packet properties.
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*/
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private static final String PROPERTIES_NAMESPACE =
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"http://www.jivesoftware.com/xmlns/xmpp/properties";
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/**
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* Parses a message packet.
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*
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* @param parser the XML parser, positioned at the start of a message packet.
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* @return a Message packet.
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* @throws Exception if an exception occurs while parsing the packet.
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*/
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public static Packet parseMessage(XmlPullParser parser) throws Exception {
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Message message = new Message();
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String id = parser.getAttributeValue("", "id");
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message.setPacketID(id == null ? Packet.ID_NOT_AVAILABLE : id);
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message.setTo(parser.getAttributeValue("", "to"));
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message.setFrom(parser.getAttributeValue("", "from"));
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message.setType(Message.Type.fromString(parser.getAttributeValue("", "type")));
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// Parse sub-elements. We include extra logic to make sure the values
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// are only read once. This is because it's possible for the names to appear
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// in arbitrary sub-elements.
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boolean done = false;
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String subject = null;
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String body = null;
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String thread = null;
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Map<String, Object> properties = null;
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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String elementName = parser.getName();
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String namespace = parser.getNamespace();
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if (elementName.equals("subject")) {
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if (subject == null) {
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subject = parser.nextText();
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}
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}
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else if (elementName.equals("body")) {
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if (body == null) {
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body = parser.nextText();
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}
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}
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else if (elementName.equals("thread")) {
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if (thread == null) {
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thread = parser.nextText();
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}
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}
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else if (elementName.equals("error")) {
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message.setError(parseError(parser));
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}
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else if (elementName.equals("properties") &&
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namespace.equals(PROPERTIES_NAMESPACE))
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{
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properties = parseProperties(parser);
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}
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// Otherwise, it must be a packet extension.
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else {
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message.addExtension(
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PacketParserUtils.parsePacketExtension(elementName, namespace, parser));
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("message")) {
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done = true;
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}
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}
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}
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message.setSubject(subject);
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message.setBody(body);
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message.setThread(thread);
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// Set packet properties.
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if (properties != null) {
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for (String name : properties.keySet()) {
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message.setProperty(name, properties.get(name));
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}
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}
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return message;
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}
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/**
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* Parses a presence packet.
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*
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* @param parser the XML parser, positioned at the start of a presence packet.
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* @return a Presence packet.
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* @throws Exception if an exception occurs while parsing the packet.
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*/
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public static Presence parsePresence(XmlPullParser parser) throws Exception {
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Presence.Type type = Presence.Type.available;
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String typeString = parser.getAttributeValue("", "type");
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if (typeString != null && !typeString.equals("")) {
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try {
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type = Presence.Type.valueOf(typeString);
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}
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catch (IllegalArgumentException iae) {
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System.err.println("Found invalid presence type " + typeString);
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}
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}
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Presence presence = new Presence(type);
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presence.setTo(parser.getAttributeValue("", "to"));
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presence.setFrom(parser.getAttributeValue("", "from"));
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String id = parser.getAttributeValue("", "id");
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presence.setPacketID(id == null ? Packet.ID_NOT_AVAILABLE : id);
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// Parse sub-elements
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boolean done = false;
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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String elementName = parser.getName();
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String namespace = parser.getNamespace();
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if (elementName.equals("status")) {
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presence.setStatus(parser.nextText());
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}
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else if (elementName.equals("priority")) {
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try {
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int priority = Integer.parseInt(parser.nextText());
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presence.setPriority(priority);
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}
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catch (NumberFormatException nfe) {
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// Ignore.
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}
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catch (IllegalArgumentException iae) {
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// Presence priority is out of range so assume priority to be zero
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presence.setPriority(0);
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}
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}
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else if (elementName.equals("show")) {
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String modeText = parser.nextText();
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try {
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presence.setMode(Presence.Mode.valueOf(modeText));
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}
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catch (IllegalArgumentException iae) {
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System.err.println("Found invalid presence mode " + modeText);
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}
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}
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else if (elementName.equals("error")) {
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presence.setError(parseError(parser));
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}
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else if (elementName.equals("properties") &&
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namespace.equals(PROPERTIES_NAMESPACE))
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{
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Map<String,Object> properties = parseProperties(parser);
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// Set packet properties.
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for (String name : properties.keySet()) {
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presence.setProperty(name, properties.get(name));
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}
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}
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// Otherwise, it must be a packet extension.
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else {
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presence.addExtension(
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PacketParserUtils.parsePacketExtension(elementName, namespace, parser));
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("presence")) {
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done = true;
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}
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}
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}
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return presence;
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}
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/**
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* Parse a properties sub-packet. If any errors occur while de-serializing Java object
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* properties, an exception will be printed and not thrown since a thrown
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* exception will shut down the entire connection. ClassCastExceptions will occur
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* when both the sender and receiver of the packet don't have identical versions
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* of the same class.
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*
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* @param parser the XML parser, positioned at the start of a properties sub-packet.
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* @return a map of the properties.
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* @throws Exception if an error occurs while parsing the properties.
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*/
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public static Map<String, Object> parseProperties(XmlPullParser parser) throws Exception {
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Map<String, Object> properties = new HashMap<String, Object>();
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while (true) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG && parser.getName().equals("property")) {
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// Parse a property
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boolean done = false;
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String name = null;
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String type = null;
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String valueText = null;
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Object value = null;
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while (!done) {
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eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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String elementName = parser.getName();
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if (elementName.equals("name")) {
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name = parser.nextText();
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}
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else if (elementName.equals("value")) {
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type = parser.getAttributeValue("", "type");
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valueText = parser.nextText();
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("property")) {
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if ("integer".equals(type)) {
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value = new Integer(valueText);
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}
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else if ("long".equals(type)) {
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value = new Long(valueText);
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}
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else if ("float".equals(type)) {
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value = new Float(valueText);
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}
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else if ("double".equals(type)) {
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value = new Double(valueText);
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}
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else if ("boolean".equals(type)) {
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value = Boolean.valueOf(valueText);
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}
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else if ("string".equals(type)) {
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value = valueText;
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}
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else if ("java-object".equals(type)) {
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try {
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byte [] bytes = StringUtils.decodeBase64(valueText);
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ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(bytes));
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value = in.readObject();
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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}
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if (name != null && value != null) {
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properties.put(name, value);
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}
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done = true;
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}
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}
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("properties")) {
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break;
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}
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}
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}
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return properties;
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}
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/**
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* Parses error sub-packets.
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*
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* @param parser the XML parser.
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* @return an error sub-packet.
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* @throws Exception if an exception occurs while parsing the packet.
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*/
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public static XMPPError parseError(XmlPullParser parser) throws Exception {
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final String errorNamespace = "urn:ietf:params:xml:ns:xmpp-stanzas";
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String errorCode = "-1";
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String type = null;
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String message = null;
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String condition = null;
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List<PacketExtension> extensions = new ArrayList<PacketExtension>();
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// Parse the error header
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for (int i=0; i<parser.getAttributeCount(); i++) {
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if (parser.getAttributeName(i).equals("code")) {
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errorCode = parser.getAttributeValue("", "code");
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}
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if (parser.getAttributeName(i).equals("type")) {
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type = parser.getAttributeValue("", "type");
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}
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}
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boolean done = false;
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// Parse the text and condition tags
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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if (parser.getName().equals("text")) {
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message = parser.nextText();
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}
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else {
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// Condition tag, it can be xmpp error or an application defined error.
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String elementName = parser.getName();
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String namespace = parser.getNamespace();
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if (errorNamespace.equals(namespace)) {
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condition = elementName;
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}
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else {
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extensions.add(parsePacketExtension(elementName, namespace, parser));
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}
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals("error")) {
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done = true;
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}
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}
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}
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// Parse the error type.
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XMPPError.Type errorType = XMPPError.Type.CANCEL;
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try {
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if (type != null) {
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errorType = XMPPError.Type.valueOf(type.toUpperCase());
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}
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}
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catch (IllegalArgumentException iae) {
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// Print stack trace. We shouldn't be getting an illegal error type.
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iae.printStackTrace();
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}
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return new XMPPError(Integer.parseInt(errorCode), errorType, condition, message, extensions);
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}
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/**
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* Parses a packet extension sub-packet.
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*
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* @param elementName the XML element name of the packet extension.
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* @param namespace the XML namespace of the packet extension.
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* @param parser the XML parser, positioned at the starting element of the extension.
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* @return a PacketExtension.
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* @throws Exception if a parsing error occurs.
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*/
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public static PacketExtension parsePacketExtension(String elementName, String namespace, XmlPullParser parser)
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throws Exception
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{
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// See if a provider is registered to handle the extension.
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Object provider = ProviderManager.getInstance().getExtensionProvider(elementName, namespace);
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if (provider != null) {
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if (provider instanceof PacketExtensionProvider) {
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return ((PacketExtensionProvider)provider).parseExtension(parser);
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}
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else if (provider instanceof Class) {
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return (PacketExtension)parseWithIntrospection(
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elementName, (Class)provider, parser);
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}
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}
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// No providers registered, so use a default extension.
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DefaultPacketExtension extension = new DefaultPacketExtension(elementName, namespace);
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boolean done = false;
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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String name = parser.getName();
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// If an empty element, set the value with the empty string.
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if (parser.isEmptyElementTag()) {
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extension.setValue(name,"");
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}
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// Otherwise, get the the element text.
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else {
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eventType = parser.next();
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if (eventType == XmlPullParser.TEXT) {
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String value = parser.getText();
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extension.setValue(name, value);
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}
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}
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals(elementName)) {
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done = true;
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}
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}
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}
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return extension;
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}
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public static Object parseWithIntrospection(String elementName,
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Class objectClass, XmlPullParser parser) throws Exception
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{
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boolean done = false;
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Object object = objectClass.newInstance();
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while (!done) {
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int eventType = parser.next();
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if (eventType == XmlPullParser.START_TAG) {
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String name = parser.getName();
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String stringValue = parser.nextText();
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PropertyDescriptor descriptor = new PropertyDescriptor(name, objectClass);
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// Load the class type of the property.
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Class propertyType = descriptor.getPropertyType();
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// Get the value of the property by converting it from a
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// String to the correct object type.
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Object value = decode(propertyType, stringValue);
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// Set the value of the bean.
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descriptor.getWriteMethod().invoke(object, value);
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}
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else if (eventType == XmlPullParser.END_TAG) {
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if (parser.getName().equals(elementName)) {
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done = true;
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}
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}
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}
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return object;
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}
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/**
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* Decodes a String into an object of the specified type. If the object
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* type is not supported, null will be returned.
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*
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* @param type the type of the property.
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* @param value the encode String value to decode.
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* @return the String value decoded into the specified type.
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* @throws Exception If decoding failed due to an error.
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*/
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private static Object decode(Class type, String value) throws Exception {
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if (type.getName().equals("java.lang.String")) {
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return value;
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}
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if (type.getName().equals("boolean")) {
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return Boolean.valueOf(value);
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}
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if (type.getName().equals("int")) {
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return Integer.valueOf(value);
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}
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if (type.getName().equals("long")) {
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return Long.valueOf(value);
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}
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if (type.getName().equals("float")) {
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return Float.valueOf(value);
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}
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if (type.getName().equals("double")) {
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return Double.valueOf(value);
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}
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if (type.getName().equals("java.lang.Class")) {
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return Class.forName(value);
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}
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return null;
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}
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} |