1 /* 2 * Copyright 2009 Jonas Ådahl. 3 * Copyright 2011-2013 Florian Schmaus 4 * 5 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.jivesoftware.smackx.provider; 19 20 import java.io.IOException; 21 22 import org.jivesoftware.smack.XMPPException; 23 import org.jivesoftware.smack.packet.PacketExtension; 24 import org.jivesoftware.smack.provider.PacketExtensionProvider; 25 import org.jivesoftware.smackx.entitycaps.packet.CapsExtension; 26 27 import org.xmlpull.v1.XmlPullParser; 28 import org.xmlpull.v1.XmlPullParserException; 29 30 public class CapsExtensionProvider implements PacketExtensionProvider { 31 private static final int MAX_DEPTH = 10; 32 parseExtension(XmlPullParser parser)33 public PacketExtension parseExtension(XmlPullParser parser) throws XmlPullParserException, IOException, 34 XMPPException { 35 String hash = null; 36 String version = null; 37 String node = null; 38 int depth = 0; 39 while (true) { 40 if (parser.getEventType() == XmlPullParser.START_TAG && parser.getName().equalsIgnoreCase("c")) { 41 hash = parser.getAttributeValue(null, "hash"); 42 version = parser.getAttributeValue(null, "ver"); 43 node = parser.getAttributeValue(null, "node"); 44 } 45 46 if (parser.getEventType() == XmlPullParser.END_TAG && parser.getName().equalsIgnoreCase("c")) { 47 break; 48 } else { 49 parser.next(); 50 } 51 52 if (depth < MAX_DEPTH) { 53 depth++; 54 } else { 55 throw new XMPPException("Malformed caps element"); 56 } 57 } 58 59 if (hash != null && version != null && node != null) { 60 return new CapsExtension(node, version, hash); 61 } else { 62 throw new XMPPException("Caps elment with missing attributes"); 63 } 64 } 65 } 66