001/*
002 *
003 * Copyright © 2009 Jonas Ådahl, 2011-2019 Florian Schmaus
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.jivesoftware.smackx.caps.provider;
018
019import java.io.IOException;
020
021import org.jivesoftware.smack.packet.XmlEnvironment;
022import org.jivesoftware.smack.provider.ExtensionElementProvider;
023import org.jivesoftware.smack.xml.XmlPullParser;
024import org.jivesoftware.smack.xml.XmlPullParserException;
025
026import org.jivesoftware.smackx.caps.EntityCapsManager;
027import org.jivesoftware.smackx.caps.packet.CapsExtension;
028
029import org.jxmpp.JxmppContext;
030
031public class CapsExtensionProvider extends ExtensionElementProvider<CapsExtension> {
032
033    @Override
034    public CapsExtension parse(XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment, JxmppContext jxmppContext) throws XmlPullParserException, IOException {
035        String hash, version, node;
036        if (parser.getEventType() == XmlPullParser.Event.START_ELEMENT
037                && parser.getName().equalsIgnoreCase(EntityCapsManager.ELEMENT)) {
038            hash = parser.getAttributeValue(null, "hash");
039            version = parser.getAttributeValue(null, "ver");
040            node = parser.getAttributeValue(null, "node");
041        } else {
042            // TODO: Should be SmackParsingException.
043            throw new IOException("Malformed Caps element");
044        }
045
046        parser.next();
047
048        if (!(parser.getEventType() == XmlPullParser.Event.END_ELEMENT
049                && parser.getName().equalsIgnoreCase(EntityCapsManager.ELEMENT))) {
050            // TODO: Should be SmackParsingException.
051            throw new IOException("Malformed nested Caps element");
052        }
053
054        if (hash != null && version != null && node != null) {
055            return new CapsExtension(node, version, hash);
056        } else {
057            // TODO: Should be SmackParsingException.
058            throw new IOException("Caps element with missing attributes. Attributes: hash=" + hash + " version="
059                            + version + " node=" + node);
060        }
061    }
062
063}