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package de.gultsch.chat.xmpp;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.net.Socket;
import java.net.UnknownHostException;
import java.security.SecureRandom;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import org.xmlpull.v1.XmlPullParserException;
import android.os.PowerManager;
import android.util.Log;
import de.gultsch.chat.entities.Account;
import de.gultsch.chat.utils.SASL;
import de.gultsch.chat.xml.Element;
import de.gultsch.chat.xml.Tag;
import de.gultsch.chat.xml.XmlReader;
import de.gultsch.chat.xml.TagWriter;
public class XmppConnection implements Runnable {
protected Account account;
private static final String LOGTAG = "xmppService";
private PowerManager.WakeLock wakeLock;
private SecureRandom random = new SecureRandom();
private Socket socket;
private XmlReader tagReader;
private TagWriter tagWriter;
private boolean isTlsEncrypted = false;
private boolean isAuthenticated = false;
public XmppConnection(Account account, PowerManager pm) {
this.account = account;
wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
"XmppConnection");
tagReader = new XmlReader(wakeLock);
tagWriter = new TagWriter();
}
protected void connect() {
try {
socket = new Socket(account.getServer(), 5222);
Log.d(LOGTAG, "starting new socket");
OutputStream out = socket.getOutputStream();
tagWriter.setOutputStream(out);
InputStream in = socket.getInputStream();
tagReader.setInputStream(in);
} catch (UnknownHostException e) {
Log.d(LOGTAG, "error during connect. unknown host");
} catch (IOException e) {
Log.d(LOGTAG, "error during connect. io exception. falscher port?");
}
}
@Override
public void run() {
connect();
try {
tagWriter.beginDocument();
sendStartStream();
Tag nextTag;
while ((nextTag = tagReader.readTag()) != null) {
if (nextTag.isStart("stream")) {
processStream(nextTag);
} else {
Log.d(LOGTAG, "found unexpected tag: " + nextTag.getName());
}
}
} catch (XmlPullParserException e) {
Log.d(LOGTAG,
"xml error during normal read. maybe missformed xml? "
+ e.getMessage());
} catch (IOException e) {
Log.d(LOGTAG, "io exception during read. connection lost?");
}
}
private void processStream(Tag currentTag) throws XmlPullParserException,
IOException {
Log.d(LOGTAG, "process Stream");
Tag nextTag;
while ((nextTag = tagReader.readTag()) != null) {
if (nextTag.isStart("error")) {
processStreamError(nextTag);
} else if (nextTag.isStart("features")) {
processStreamFeatures(nextTag);
if (!isTlsEncrypted) {
sendStartTLS();
}
if ((!isAuthenticated) && (isTlsEncrypted)) {
sendSaslAuth();
}
if ((isAuthenticated)&&(isTlsEncrypted)) {
sendBindRequest();
}
} else if (nextTag.isStart("proceed")) {
switchOverToTls(nextTag);
} else if (nextTag.isStart("success")) {
isAuthenticated = true;
Log.d(LOGTAG,"read success tag in stream. reset again");
tagReader.readTag();
tagReader.reset();
sendStartStream();
processStream(tagReader.readTag());
} else if (nextTag.isStart("iq")) {
processIq(nextTag);
} else if (nextTag.isEnd("stream")) {
break;
} else {
Log.d(LOGTAG, "found unexpected tag: " + nextTag.getName()
+ " as child of " + currentTag.getName());
}
}
}
private void processIq(Tag currentTag) throws XmlPullParserException, IOException {
int typ = -1;
if (currentTag.getAttribute("type").equals("result")) {
typ = IqPacket.TYPE_RESULT;
}
IqPacket iq = new IqPacket(currentTag.getAttribute("id"),typ);
Tag nextTag = tagReader.readTag();
while(!nextTag.isEnd("iq")) {
Element element = tagReader.readElement(nextTag);
iq.addChild(element);
nextTag = tagReader.readTag();
}
Log.d(LOGTAG,"this is what i understood: "+iq.toString());
}
private void sendStartTLS() throws XmlPullParserException, IOException {
Tag startTLS = Tag.empty("starttls");
startTLS.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-tls");
Log.d(LOGTAG, "sending starttls");
tagWriter.writeTag(startTLS).flush();
}
private void switchOverToTls(Tag currentTag) throws XmlPullParserException,
IOException {
Tag nextTag = tagReader.readTag(); // should be proceed end tag
Log.d(LOGTAG, "now switch to ssl");
SSLSocket sslSocket;
try {
sslSocket = (SSLSocket) ((SSLSocketFactory) SSLSocketFactory
.getDefault()).createSocket(socket, socket.getInetAddress()
.getHostAddress(), socket.getPort(), true);
tagReader.setInputStream(sslSocket.getInputStream());
Log.d(LOGTAG, "reset inputstream");
tagWriter.setOutputStream(sslSocket.getOutputStream());
Log.d(LOGTAG, "switch over seemed to work");
isTlsEncrypted = true;
sendStartStream();
processStream(tagReader.readTag());
} catch (IOException e) {
Log.d(LOGTAG, "error on ssl" + e.getMessage());
}
}
private void sendSaslAuth() throws IOException, XmlPullParserException {
String saslString = SASL.plain(account.getUsername(),
account.getPassword());
Element auth = new Element("auth");
auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
auth.setAttribute("mechanism", "PLAIN");
auth.setContent(saslString);
Log.d(LOGTAG,"sending sasl "+auth.toString());
tagWriter.writeElement(auth);
tagWriter.flush();
}
private void processStreamFeatures(Tag currentTag)
throws XmlPullParserException, IOException {
Log.d(LOGTAG, "processStreamFeatures");
Element streamFeatures = new Element("features");
Tag nextTag = tagReader.readTag();
while(!nextTag.isEnd("features")) {
Element element = tagReader.readElement(nextTag);
streamFeatures.addChild(element);
nextTag = tagReader.readTag();
}
}
private void sendBindRequest() throws IOException {
IqPacket iq = new IqPacket(nextRandomId(),IqPacket.TYPE_SET);
Element bind = new Element("bind");
bind.setAttribute("xmlns","urn:ietf:params:xml:ns:xmpp-bind");
iq.addChild(bind);
Log.d(LOGTAG,"sending bind request: "+iq.toString());
tagWriter.writeElement(iq);
tagWriter.flush();
}
private void processStreamError(Tag currentTag) {
Log.d(LOGTAG, "processStreamError");
}
private void sendStartStream() throws IOException {
Tag stream = Tag.start("stream");
stream.setAttribute("from", account.getJid());
stream.setAttribute("to", account.getServer());
stream.setAttribute("version", "1.0");
stream.setAttribute("xml:lang", "en");
stream.setAttribute("xmlns", "jabber:client");
stream.setAttribute("xmlns:stream", "http://etherx.jabber.org/streams");
tagWriter.writeTag(stream).flush();
}
private String nextRandomId() {
return new BigInteger(50, random).toString(32);
}
}
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