001/**
002 *
003 * Copyright 2017 Paul Schaub
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.omemo.element;
018
019import org.jivesoftware.smack.packet.XmlElement;
020import org.jivesoftware.smack.packet.XmlEnvironment;
021import org.jivesoftware.smack.util.XmlStringBuilder;
022import org.jivesoftware.smack.util.stringencoder.Base64;
023
024import org.jivesoftware.smackx.omemo.util.OmemoConstants;
025
026/**
027 * Small class to collect key (byte[]), its id and whether its a preKey or not.
028 */
029public class OmemoKeyElement implements XmlElement {
030
031    public static final String ELEMENT = "key";
032    public static final String NAMESPACE = OmemoConstants.OMEMO_NAMESPACE_V_AXOLOTL;
033
034    public static final String ATTR_RID = "rid";
035    public static final String ATTR_PREKEY = "prekey";
036
037    private final byte[] data;
038    private final int id;
039    private final boolean preKey;
040
041    public OmemoKeyElement(byte[] data, int id) {
042        this(data, id, false);
043    }
044
045    public OmemoKeyElement(byte[] data, int id, boolean preKey) {
046        this.data = data;
047        this.id = id;
048        this.preKey = preKey;
049    }
050
051    public int getId() {
052        return this.id;
053    }
054
055    public byte[] getData() {
056        return this.data;
057    }
058
059    public boolean isPreKey() {
060        return this.preKey;
061    }
062
063    @Override
064    public String toString() {
065        return Integer.toString(id);
066    }
067
068    @Override
069    public String getElementName() {
070        return ELEMENT;
071    }
072
073    @Override
074    public String getNamespace() {
075        return NAMESPACE;
076    }
077
078    @Override
079    public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
080        XmlStringBuilder sb = new XmlStringBuilder(this, enclosingXmlEnvironment);
081
082        if (isPreKey()) {
083            sb.attribute(ATTR_PREKEY, true);
084        }
085
086        sb.attribute(ATTR_RID, getId());
087        sb.rightAngleBracket();
088        sb.append(Base64.encodeToString(getData()));
089        sb.closeElement(this);
090        return sb;
091    }
092}