287 lines
11 KiB
Java
287 lines
11 KiB
Java
/**
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*
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* Copyright 2014 Andriy Tsykholyas, 2015-2019 Florian Schmaus
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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.hoxt.provider;
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import java.io.IOException;
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import org.jivesoftware.smack.packet.NamedElement;
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import org.jivesoftware.smack.parsing.SmackParsingException;
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import org.jivesoftware.smack.provider.IqProvider;
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import org.jivesoftware.smack.util.StringUtils;
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import org.jivesoftware.smack.xml.XmlPullParser;
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import org.jivesoftware.smack.xml.XmlPullParserException;
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import org.jivesoftware.smackx.hoxt.packet.AbstractHttpOverXmpp;
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import org.jivesoftware.smackx.shim.packet.HeadersExtension;
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import org.jivesoftware.smackx.shim.provider.HeadersProvider;
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/**
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* Abstract parent for Req and Resp stanza providers.
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*
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* @author Andriy Tsykholyas
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* @see <a href="http://xmpp.org/extensions/xep-0332.html">XEP-0332: HTTP over XMPP transport</a>
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*/
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public abstract class AbstractHttpOverXmppProvider<H extends AbstractHttpOverXmpp> extends IqProvider<H> {
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private static final String ELEMENT_DATA = "data";
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private static final String ELEMENT_TEXT = "text";
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private static final String ELEMENT_BASE_64 = "base64";
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private static final String ELEMENT_CHUNKED_BASE_64 = "chunkedBase64";
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private static final String ELEMENT_XML = "xml";
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static final String ELEMENT_IBB = "ibb";
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static final String ELEMENT_SIPUB = "sipub";
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static final String ELEMENT_JINGLE = "jingle";
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private static final String ATTRIBUTE_STREAM_ID = "streamId";
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private static final String ATTRIBUTE_SID = "sid";
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static final String ATTRIBUTE_VERSION = "version";
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/**
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* Parses HeadersExtension element if any.
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*
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* @param parser parser
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* @return HeadersExtension or null if no headers
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* @throws XmlPullParserException if an error in the XML parser occurred.
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* @throws IOException if an I/O error occurred.
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* @throws SmackParsingException if the Smack parser (provider) encountered invalid input.
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*/
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protected HeadersExtension parseHeaders(XmlPullParser parser) throws IOException, XmlPullParserException, SmackParsingException {
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HeadersExtension headersExtension = null;
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/* We are either at start of headers, start of data or end of req/res */
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if (parser.next() == XmlPullParser.Event.START_ELEMENT && parser.getName().equals(HeadersExtension.ELEMENT)) {
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headersExtension = HeadersProvider.INSTANCE.parse(parser);
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parser.next();
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}
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return headersExtension;
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}
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/**
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* Parses Data element if any.
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*
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* @param parser parser
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* @return Data or null if no data
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*
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* @throws XmlPullParserException if an error in the XML parser occurred.
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* @throws IOException if an I/O error occurred.
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*/
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protected AbstractHttpOverXmpp.Data parseData(XmlPullParser parser) throws XmlPullParserException, IOException {
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NamedElement child = null;
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boolean done = false;
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AbstractHttpOverXmpp.Data data = null;
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/* We are either at start of data or end of req/res */
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if (parser.getEventType() == XmlPullParser.Event.START_ELEMENT) {
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while (!done) {
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XmlPullParser.Event eventType = parser.next();
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if (eventType == XmlPullParser.Event.START_ELEMENT) {
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switch (parser.getName()) {
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case ELEMENT_TEXT:
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child = parseText(parser);
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break;
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case ELEMENT_BASE_64:
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child = parseBase64(parser);
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break;
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case ELEMENT_CHUNKED_BASE_64:
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child = parseChunkedBase64(parser);
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break;
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case ELEMENT_XML:
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child = parseXml(parser);
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break;
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case ELEMENT_IBB:
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child = parseIbb(parser);
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break;
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case ELEMENT_SIPUB:
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// TODO: sipub is allowed by xep-0332, but is not
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// implemented yet
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throw new UnsupportedOperationException("sipub is not supported yet");
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case ELEMENT_JINGLE:
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// TODO: jingle is allowed by xep-0332, but is not
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// implemented yet
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throw new UnsupportedOperationException("jingle is not supported yet");
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default:
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// other elements are not allowed
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throw new IllegalArgumentException("unsupported child tag: " + parser.getName());
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}
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} else if (eventType == XmlPullParser.Event.END_ELEMENT) {
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if (parser.getName().equals(ELEMENT_DATA)) {
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done = true;
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}
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}
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}
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data = new AbstractHttpOverXmpp.Data(child);
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}
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return data;
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}
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private static AbstractHttpOverXmpp.Text parseText(XmlPullParser parser) throws XmlPullParserException, IOException {
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String text = null;
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boolean done = false;
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while (!done) {
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XmlPullParser.Event eventType = parser.next();
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if (eventType == XmlPullParser.Event.END_ELEMENT) {
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if (parser.getName().equals(ELEMENT_TEXT)) {
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done = true;
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} else {
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throw new IllegalArgumentException("unexpected end tag of: " + parser.getName());
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}
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} else if (eventType == XmlPullParser.Event.TEXT_CHARACTERS) {
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text = parser.getText();
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} else {
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throw new IllegalArgumentException("unexpected eventType: " + eventType);
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}
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}
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return new AbstractHttpOverXmpp.Text(text);
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}
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private static AbstractHttpOverXmpp.Xml parseXml(XmlPullParser parser)
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throws XmlPullParserException, IOException {
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StringBuilder builder = new StringBuilder();
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boolean done = false;
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boolean startClosed = true;
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while (!done) {
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XmlPullParser.Event eventType = parser.next();
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if ((eventType == XmlPullParser.Event.END_ELEMENT) && parser.getName().equals(ELEMENT_XML)) {
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done = true;
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} else { // just write everything else as text
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if (eventType == XmlPullParser.Event.START_ELEMENT) {
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if (!startClosed) {
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builder.append('>');
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}
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builder.append('<');
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builder.append(parser.getName());
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appendXmlAttributes(parser, builder);
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startClosed = false;
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} else if (eventType == XmlPullParser.Event.END_ELEMENT) {
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if (startClosed) {
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builder.append("</");
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builder.append(parser.getName());
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builder.append('>');
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} else {
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builder.append("/>");
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startClosed = true;
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}
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} else if (eventType == XmlPullParser.Event.TEXT_CHARACTERS) {
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if (!startClosed) {
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builder.append('>');
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startClosed = true;
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}
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builder.append(StringUtils.escapeForXmlText(parser.getText()));
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} else {
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throw new IllegalArgumentException("unexpected eventType: " + eventType);
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}
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}
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}
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return new AbstractHttpOverXmpp.Xml(builder.toString());
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}
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private static void appendXmlAttributes(XmlPullParser parser, StringBuilder builder) {
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// NOTE: for now we ignore namespaces
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int count = parser.getAttributeCount();
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if (count > 0) {
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for (int i = 0; i < count; i++) {
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builder.append(' ');
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builder.append(parser.getAttributeName(i));
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builder.append("=\"");
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builder.append(StringUtils.escapeForXml(parser.getAttributeValue(i)));
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builder.append('"');
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}
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}
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}
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private static AbstractHttpOverXmpp.Base64 parseBase64(XmlPullParser parser) throws XmlPullParserException,
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IOException {
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String text = null;
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boolean done = false;
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while (!done) {
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XmlPullParser.Event eventType = parser.next();
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if (eventType == XmlPullParser.Event.END_ELEMENT) {
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if (parser.getName().equals(ELEMENT_BASE_64)) {
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done = true;
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} else {
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throw new IllegalArgumentException("unexpected end tag of: " + parser.getName());
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}
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} else if (eventType == XmlPullParser.Event.TEXT_CHARACTERS) {
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text = parser.getText();
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} else {
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throw new IllegalArgumentException("unexpected eventType: " + eventType);
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}
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}
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return new AbstractHttpOverXmpp.Base64(text);
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}
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private static AbstractHttpOverXmpp.ChunkedBase64 parseChunkedBase64(XmlPullParser parser)
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throws XmlPullParserException, IOException {
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String streamId = parser.getAttributeValue("", ATTRIBUTE_STREAM_ID);
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AbstractHttpOverXmpp.ChunkedBase64 child = new AbstractHttpOverXmpp.ChunkedBase64(streamId);
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boolean done = false;
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while (!done) {
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XmlPullParser.Event eventType = parser.next();
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if (eventType == XmlPullParser.Event.END_ELEMENT) {
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if (parser.getName().equals(ELEMENT_CHUNKED_BASE_64)) {
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done = true;
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} else {
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throw new IllegalArgumentException("unexpected end tag: " + parser.getName());
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}
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} else {
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throw new IllegalArgumentException("unexpected event type: " + eventType);
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}
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}
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return child;
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}
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private static AbstractHttpOverXmpp.Ibb parseIbb(XmlPullParser parser) throws XmlPullParserException, IOException {
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String sid = parser.getAttributeValue("", ATTRIBUTE_SID);
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AbstractHttpOverXmpp.Ibb child = new AbstractHttpOverXmpp.Ibb(sid);
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boolean done = false;
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while (!done) {
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XmlPullParser.Event eventType = parser.next();
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if (eventType == XmlPullParser.Event.END_ELEMENT) {
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if (parser.getName().equals(ELEMENT_IBB)) {
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done = true;
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} else {
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throw new IllegalArgumentException("unexpected end tag: " + parser.getName());
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}
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} else {
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throw new IllegalArgumentException("unexpected event type: " + eventType);
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}
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}
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return child;
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}
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}
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