mirror of
https://github.com/vanitasvitae/Smack.git
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150 lines
4.7 KiB
Java
150 lines
4.7 KiB
Java
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/**
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* All rights reserved. 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.bytestreams.ibb.packet;
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import org.jivesoftware.smack.packet.PacketExtension;
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import org.jivesoftware.smack.util.StringUtils;
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import org.jivesoftware.smackx.bytestreams.ibb.InBandBytestreamManager;
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/**
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* Represents a chunk of data of an In-Band Bytestream within an IQ stanza or a
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* message stanza
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*
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* @author Henning Staib
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*/
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public class DataPacketExtension implements PacketExtension {
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/**
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* The element name of the data packet extension.
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*/
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public final static String ELEMENT_NAME = "data";
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/* unique session ID identifying this In-Band Bytestream */
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private final String sessionID;
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/* sequence of this packet in regard to the other data packets */
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private final long seq;
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/* the data contained in this packet */
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private final String data;
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private byte[] decodedData;
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/**
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* Creates a new In-Band Bytestream data packet.
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*
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* @param sessionID unique session ID identifying this In-Band Bytestream
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* @param seq sequence of this packet in regard to the other data packets
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* @param data the base64 encoded data contained in this packet
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*/
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public DataPacketExtension(String sessionID, long seq, String data) {
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if (sessionID == null || "".equals(sessionID)) {
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throw new IllegalArgumentException("Session ID must not be null or empty");
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}
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if (seq < 0 || seq > 65535) {
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throw new IllegalArgumentException("Sequence must not be between 0 and 65535");
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}
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if (data == null) {
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throw new IllegalArgumentException("Data must not be null");
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}
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this.sessionID = sessionID;
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this.seq = seq;
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this.data = data;
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}
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/**
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* Returns the unique session ID identifying this In-Band Bytestream.
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*
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* @return the unique session ID identifying this In-Band Bytestream
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*/
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public String getSessionID() {
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return sessionID;
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}
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/**
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* Returns the sequence of this packet in regard to the other data packets.
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*
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* @return the sequence of this packet in regard to the other data packets.
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*/
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public long getSeq() {
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return seq;
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}
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/**
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* Returns the data contained in this packet.
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*
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* @return the data contained in this packet.
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*/
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public String getData() {
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return data;
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}
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/**
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* Returns the decoded data or null if data could not be decoded.
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* <p>
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* The encoded data is invalid if it contains bad Base64 input characters or
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* if it contains the pad ('=') character on a position other than the last
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* character(s) of the data. See <a
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* href="http://xmpp.org/extensions/xep-0047.html#sec">XEP-0047</a> Section
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* 6.
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*
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* @return the decoded data
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*/
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public byte[] getDecodedData() {
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// return cached decoded data
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if (this.decodedData != null) {
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return this.decodedData;
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}
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// data must not contain the pad (=) other than end of data
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if (data.matches(".*={1,2}+.+")) {
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return null;
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}
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// decodeBase64 will return null if bad characters are included
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this.decodedData = StringUtils.decodeBase64(data);
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return this.decodedData;
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}
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public String getElementName() {
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return ELEMENT_NAME;
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}
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public String getNamespace() {
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return InBandBytestreamManager.NAMESPACE;
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}
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public String toXML() {
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StringBuilder buf = new StringBuilder();
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buf.append("<");
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buf.append(getElementName());
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buf.append(" ");
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buf.append("xmlns=\"");
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buf.append(InBandBytestreamManager.NAMESPACE);
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buf.append("\" ");
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buf.append("seq=\"");
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buf.append(seq);
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buf.append("\" ");
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buf.append("sid=\"");
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buf.append(sessionID);
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buf.append("\">");
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buf.append(data);
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buf.append("</");
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buf.append(getElementName());
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buf.append(">");
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return buf.toString();
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}
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}
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