AbstractHttpOverXmppProvider.java
/**
*
* Copyright 2014 Andriy Tsykholyas, 2015-2019 Florian Schmaus
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.hoxt.provider;
import java.io.IOException;
import org.jivesoftware.smack.packet.NamedElement;
import org.jivesoftware.smack.parsing.SmackParsingException;
import org.jivesoftware.smack.provider.IqProvider;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smack.xml.XmlPullParser;
import org.jivesoftware.smack.xml.XmlPullParserException;
import org.jivesoftware.smackx.hoxt.packet.AbstractHttpOverXmpp;
import org.jivesoftware.smackx.shim.packet.HeadersExtension;
import org.jivesoftware.smackx.shim.provider.HeadersProvider;
/**
* Abstract parent for Req and Resp stanza providers.
*
* @author Andriy Tsykholyas
* @see <a href="http://xmpp.org/extensions/xep-0332.html">XEP-0332: HTTP over XMPP transport</a>
*/
public abstract class AbstractHttpOverXmppProvider<H extends AbstractHttpOverXmpp> extends IqProvider<H> {
private static final String ELEMENT_DATA = "data";
private static final String ELEMENT_TEXT = "text";
private static final String ELEMENT_BASE_64 = "base64";
private static final String ELEMENT_CHUNKED_BASE_64 = "chunkedBase64";
private static final String ELEMENT_XML = "xml";
static final String ELEMENT_IBB = "ibb";
static final String ELEMENT_SIPUB = "sipub";
static final String ELEMENT_JINGLE = "jingle";
private static final String ATTRIBUTE_STREAM_ID = "streamId";
private static final String ATTRIBUTE_SID = "sid";
static final String ATTRIBUTE_VERSION = "version";
/**
* Parses HeadersExtension element if any.
*
* @param parser parser
* @return HeadersExtension or null if no headers
* @throws XmlPullParserException if an error in the XML parser occurred.
* @throws IOException if an I/O error occurred.
* @throws SmackParsingException if the Smack parser (provider) encountered invalid input.
*/
protected HeadersExtension parseHeaders(XmlPullParser parser) throws IOException, XmlPullParserException, SmackParsingException {
HeadersExtension headersExtension = null;
/* We are either at start of headers, start of data or end of req/res */
if (parser.next() == XmlPullParser.Event.START_ELEMENT && parser.getName().equals(HeadersExtension.ELEMENT)) {
headersExtension = HeadersProvider.INSTANCE.parse(parser);
parser.next();
}
return headersExtension;
}
/**
* Parses Data element if any.
*
* @param parser parser
* @return Data or null if no data
*
* @throws XmlPullParserException if an error in the XML parser occurred.
* @throws IOException if an I/O error occurred.
*/
protected AbstractHttpOverXmpp.Data parseData(XmlPullParser parser) throws XmlPullParserException, IOException {
NamedElement child = null;
boolean done = false;
AbstractHttpOverXmpp.Data data = null;
/* We are either at start of data or end of req/res */
if (parser.getEventType() == XmlPullParser.Event.START_ELEMENT) {
while (!done) {
XmlPullParser.Event eventType = parser.next();
if (eventType == XmlPullParser.Event.START_ELEMENT) {
switch (parser.getName()) {
case ELEMENT_TEXT:
child = parseText(parser);
break;
case ELEMENT_BASE_64:
child = parseBase64(parser);
break;
case ELEMENT_CHUNKED_BASE_64:
child = parseChunkedBase64(parser);
break;
case ELEMENT_XML:
child = parseXml(parser);
break;
case ELEMENT_IBB:
child = parseIbb(parser);
break;
case ELEMENT_SIPUB:
// TODO: sipub is allowed by xep-0332, but is not
// implemented yet
throw new UnsupportedOperationException("sipub is not supported yet");
case ELEMENT_JINGLE:
// TODO: jingle is allowed by xep-0332, but is not
// implemented yet
throw new UnsupportedOperationException("jingle is not supported yet");
default:
// other elements are not allowed
throw new IllegalArgumentException("unsupported child tag: " + parser.getName());
}
} else if (eventType == XmlPullParser.Event.END_ELEMENT) {
if (parser.getName().equals(ELEMENT_DATA)) {
done = true;
}
}
}
data = new AbstractHttpOverXmpp.Data(child);
}
return data;
}
private static AbstractHttpOverXmpp.Text parseText(XmlPullParser parser) throws XmlPullParserException, IOException {
String text = null;
boolean done = false;
while (!done) {
XmlPullParser.Event eventType = parser.next();
if (eventType == XmlPullParser.Event.END_ELEMENT) {
if (parser.getName().equals(ELEMENT_TEXT)) {
done = true;
} else {
throw new IllegalArgumentException("unexpected end tag of: " + parser.getName());
}
} else if (eventType == XmlPullParser.Event.TEXT_CHARACTERS) {
text = parser.getText();
} else {
throw new IllegalArgumentException("unexpected eventType: " + eventType);
}
}
return new AbstractHttpOverXmpp.Text(text);
}
private static AbstractHttpOverXmpp.Xml parseXml(XmlPullParser parser)
throws XmlPullParserException, IOException {
StringBuilder builder = new StringBuilder();
boolean done = false;
boolean startClosed = true;
while (!done) {
XmlPullParser.Event eventType = parser.next();
if ((eventType == XmlPullParser.Event.END_ELEMENT) && parser.getName().equals(ELEMENT_XML)) {
done = true;
} else { // just write everything else as text
if (eventType == XmlPullParser.Event.START_ELEMENT) {
if (!startClosed) {
builder.append('>');
}
builder.append('<');
builder.append(parser.getName());
appendXmlAttributes(parser, builder);
startClosed = false;
} else if (eventType == XmlPullParser.Event.END_ELEMENT) {
if (startClosed) {
builder.append("</");
builder.append(parser.getName());
builder.append('>');
} else {
builder.append("/>");
startClosed = true;
}
} else if (eventType == XmlPullParser.Event.TEXT_CHARACTERS) {
if (!startClosed) {
builder.append('>');
startClosed = true;
}
builder.append(StringUtils.escapeForXmlText(parser.getText()));
} else {
throw new IllegalArgumentException("unexpected eventType: " + eventType);
}
}
}
return new AbstractHttpOverXmpp.Xml(builder.toString());
}
private static void appendXmlAttributes(XmlPullParser parser, StringBuilder builder) {
// NOTE: for now we ignore namespaces
int count = parser.getAttributeCount();
if (count > 0) {
for (int i = 0; i < count; i++) {
builder.append(' ');
builder.append(parser.getAttributeName(i));
builder.append("=\"");
builder.append(StringUtils.escapeForXml(parser.getAttributeValue(i)));
builder.append('"');
}
}
}
private static AbstractHttpOverXmpp.Base64 parseBase64(XmlPullParser parser) throws XmlPullParserException,
IOException {
String text = null;
boolean done = false;
while (!done) {
XmlPullParser.Event eventType = parser.next();
if (eventType == XmlPullParser.Event.END_ELEMENT) {
if (parser.getName().equals(ELEMENT_BASE_64)) {
done = true;
} else {
throw new IllegalArgumentException("unexpected end tag of: " + parser.getName());
}
} else if (eventType == XmlPullParser.Event.TEXT_CHARACTERS) {
text = parser.getText();
} else {
throw new IllegalArgumentException("unexpected eventType: " + eventType);
}
}
return new AbstractHttpOverXmpp.Base64(text);
}
private static AbstractHttpOverXmpp.ChunkedBase64 parseChunkedBase64(XmlPullParser parser)
throws XmlPullParserException, IOException {
String streamId = parser.getAttributeValue("", ATTRIBUTE_STREAM_ID);
AbstractHttpOverXmpp.ChunkedBase64 child = new AbstractHttpOverXmpp.ChunkedBase64(streamId);
boolean done = false;
while (!done) {
XmlPullParser.Event eventType = parser.next();
if (eventType == XmlPullParser.Event.END_ELEMENT) {
if (parser.getName().equals(ELEMENT_CHUNKED_BASE_64)) {
done = true;
} else {
throw new IllegalArgumentException("unexpected end tag: " + parser.getName());
}
} else {
throw new IllegalArgumentException("unexpected event type: " + eventType);
}
}
return child;
}
private static AbstractHttpOverXmpp.Ibb parseIbb(XmlPullParser parser) throws XmlPullParserException, IOException {
String sid = parser.getAttributeValue("", ATTRIBUTE_SID);
AbstractHttpOverXmpp.Ibb child = new AbstractHttpOverXmpp.Ibb(sid);
boolean done = false;
while (!done) {
XmlPullParser.Event eventType = parser.next();
if (eventType == XmlPullParser.Event.END_ELEMENT) {
if (parser.getName().equals(ELEMENT_IBB)) {
done = true;
} else {
throw new IllegalArgumentException("unexpected end tag: " + parser.getName());
}
} else {
throw new IllegalArgumentException("unexpected event type: " + eventType);
}
}
return child;
}
}