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3d4e7938a7
ExtensionElement is now a marker interface that requires all implementation non-abstract classes to carry a static final QNAME field (of type QName). This is verified by a new unit test. Also FullyQualifiedElement is renamed to simply XmlElement. XmlElement is used over ExtensionElement when implementing classes do not statically know the qualified name of the XML elements they represent. In general, XmlElement should be used sparingly, and every XML element should be modeled by its own Java class (implementing ExtensionElement).
94 lines
2.6 KiB
Java
94 lines
2.6 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.element;
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import java.util.ArrayList;
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import java.util.List;
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import org.jivesoftware.smack.packet.XmlElement;
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import org.jivesoftware.smack.packet.XmlEnvironment;
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import org.jivesoftware.smack.util.XmlStringBuilder;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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import org.jivesoftware.smackx.omemo.util.OmemoConstants;
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/**
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* Header element of the message. The header contains information about the sender and the encrypted keys for
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* the recipients, as well as the iv element for AES.
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*/
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public abstract class OmemoHeaderElement implements XmlElement {
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public static final String ELEMENT = "header";
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public static final String NAMESPACE = OmemoConstants.OMEMO_NAMESPACE_V_AXOLOTL;
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public static final String ATTR_SID = "sid";
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public static final String ATTR_IV = "iv";
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private final int sid;
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private final List<OmemoKeyElement> keys;
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private final byte[] iv;
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public OmemoHeaderElement(int sid, List<OmemoKeyElement> keys, byte[] iv) {
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this.sid = sid;
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this.keys = keys;
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this.iv = iv;
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}
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/**
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* Return the deviceId of the sender of the message.
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*
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* @return senders id
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*/
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public int getSid() {
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return sid;
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}
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public ArrayList<OmemoKeyElement> getKeys() {
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return new ArrayList<>(keys);
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}
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public byte[] getIv() {
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return iv != null ? iv.clone() : null;
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}
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@Override
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public String getElementName() {
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return ELEMENT;
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}
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@Override
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public String getNamespace() {
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return NAMESPACE;
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}
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@Override
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public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
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XmlStringBuilder sb = new XmlStringBuilder(this, enclosingXmlEnvironment);
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sb.attribute(ATTR_SID, getSid()).rightAngleBracket();
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for (OmemoKeyElement k : getKeys()) {
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sb.append(k);
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}
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sb.openElement(ATTR_IV).append(Base64.encodeToString(getIv())).closeElement(ATTR_IV);
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return sb.closeElement(this);
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}
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}
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