94 lines
4.0 KiB
Java
94 lines
4.0 KiB
Java
/**
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*
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* Copyright 2017 Paul Schaub
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*
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* 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.smackx.omemo.provider;
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import static org.jivesoftware.smackx.omemo.element.OmemoElement.ATTR_PAYLOAD;
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import static org.jivesoftware.smackx.omemo.element.OmemoElement.NAME_ENCRYPTED;
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import static org.xmlpull.v1.XmlPullParser.END_TAG;
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import static org.xmlpull.v1.XmlPullParser.START_TAG;
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import java.util.ArrayList;
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import org.jivesoftware.smack.provider.ExtensionElementProvider;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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import org.jivesoftware.smackx.omemo.element.OmemoElement_VAxolotl;
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import org.jivesoftware.smackx.omemo.element.OmemoHeaderElement;
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import org.jivesoftware.smackx.omemo.element.OmemoHeaderElement_VAxolotl;
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import org.jivesoftware.smackx.omemo.element.OmemoKeyElement;
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import org.xmlpull.v1.XmlPullParser;
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/**
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* Smack ExtensionProvider that parses incoming OMEMO Message element into OmemoMessageElement objects.
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*
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* @author Paul Schaub
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*/
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public class OmemoVAxolotlProvider extends ExtensionElementProvider<OmemoElement_VAxolotl> {
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@Override
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public OmemoElement_VAxolotl parse(XmlPullParser parser, int initialDepth) throws Exception {
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boolean inEncrypted = true;
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int sid = -1;
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ArrayList<OmemoKeyElement> keys = new ArrayList<>();
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byte[] iv = null;
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byte[] payload = null;
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while (inEncrypted) {
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int tag = parser.next();
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String name = parser.getName();
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switch (tag) {
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case START_TAG:
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switch (name) {
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case OmemoHeaderElement.NAME_HEADER:
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for (int i = 0; i < parser.getAttributeCount(); i++) {
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if (parser.getAttributeName(i).equals(OmemoHeaderElement.ATTR_SID)) {
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sid = Integer.parseInt(parser.getAttributeValue(i));
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}
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}
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break;
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case OmemoKeyElement.NAME_KEY:
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boolean prekey = false;
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int rid = -1;
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for (int i = 0; i < parser.getAttributeCount(); i++) {
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if (parser.getAttributeName(i).equals(OmemoKeyElement.ATTR_PREKEY)) {
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prekey = Boolean.parseBoolean(parser.getAttributeValue(i));
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} else if (parser.getAttributeName(i).equals(OmemoKeyElement.ATTR_RID)) {
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rid = Integer.parseInt(parser.getAttributeValue(i));
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}
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}
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keys.add(new OmemoKeyElement(Base64.decode(parser.nextText()), rid, prekey));
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break;
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case OmemoHeaderElement.ATTR_IV:
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iv = Base64.decode(parser.nextText());
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break;
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case ATTR_PAYLOAD:
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payload = Base64.decode(parser.nextText());
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break;
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}
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break;
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case END_TAG:
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if (name.equals(NAME_ENCRYPTED)) {
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inEncrypted = false;
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}
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break;
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}
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}
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OmemoHeaderElement_VAxolotl header = new OmemoHeaderElement_VAxolotl(sid, keys, iv);
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return new OmemoElement_VAxolotl(header, payload);
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}
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}
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