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/*
* Copyright (c) 2010-2014 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
/*
* Copyright (c) 2015 Tarun Gupta.
* Licensed under the simplified BSD license.
* See Documentation/Licenses/BSD-simplified.txt for more information.
*/
package com.isode.stroke.component;
import com.isode.stroke.jid.JID;
import com.isode.stroke.elements.Stanza;
import com.isode.stroke.elements.Element;
import com.isode.stroke.elements.ProtocolHeader;
import com.isode.stroke.elements.ComponentHandshake;
import com.isode.stroke.elements.StreamFeatures;
import com.isode.stroke.session.SessionStream;
import com.isode.stroke.crypto.CryptoProvider;
import com.isode.stroke.crypto.JavaCryptoProvider;
import com.isode.stroke.signals.Signal1;
import com.isode.stroke.signals.Signal;
import com.isode.stroke.signals.SignalConnection;
import com.isode.stroke.signals.Slot1;
public class ComponentSession {
public enum State {
Initial,
WaitingForStreamStart,
Authenticating,
Initialized,
Finishing,
Finished
};
public static class Error implements com.isode.stroke.base.Error {
public enum Type {
AuthenticationFailedError,
UnexpectedElementError
}
public Type type;
public Error(Type type) {
if (type == null) {
throw new IllegalStateException();
}
this.type = type;
}
};
private JID jid = new JID();
private String secret = "";
private SessionStream stream;
private CryptoProvider crypto;
private com.isode.stroke.base.Error error;
private State state;
public final Signal onInitialized = new Signal();
public final Signal1<com.isode.stroke.base.Error> onFinished = new Signal1<com.isode.stroke.base.Error>();
public final Signal1<Stanza> onStanzaReceived = new Signal1<Stanza>();
private SignalConnection onStreamStartReceivedConnection;
private SignalConnection onElementReceivedConnection;
private SignalConnection onClosedConnection;
public static ComponentSession create(final JID jid, final String secret, SessionStream stream, CryptoProvider crypto) {
return new ComponentSession(jid, secret, stream, crypto);
}
public State getState() {
return state;
}
public void start() {
onStreamStartReceivedConnection = stream.onStreamStartReceived.connect(new Slot1<ProtocolHeader>() {
@Override
public void call(ProtocolHeader p1) {
handleStreamStart(p1);
}
});
onElementReceivedConnection = stream.onElementReceived.connect(new Slot1<Element>() {
@Override
public void call(Element e1) {
handleElement(e1);
}
});
onClosedConnection = stream.onClosed.connect(new Slot1<SessionStream.Error>() {
@Override
public void call(SessionStream.Error e1) {
handleStreamClosed(e1);
}
});
assert(State.Initial.equals(state));
state = State.WaitingForStreamStart;
sendStreamHeader();
}
public void finish() {
finishSession((Error.Type)null);
}
public void sendStanza(Stanza stanza) {
stream.writeElement(stanza);
}
private ComponentSession(final JID jid, final String secret, SessionStream stream, CryptoProvider crypto) {
this.jid = jid;
this.secret = secret;
this.stream = stream;
this.crypto = crypto;
this.state = State.Initial;
}
private void finishSession(Error.Type error) {
Error localError = null;
if (error != null) {
localError = new Error(error);
}
finishSession(localError);
}
private void finishSession(com.isode.stroke.base.Error finishError) {
state = State.Finishing;
error = finishError;
assert(stream.isOpen() == true);
stream.writeFooter();
stream.close();
}
private void sendStreamHeader() {
ProtocolHeader header = new ProtocolHeader();
header.setTo(jid.toString());
stream.writeHeader(header);
}
private void handleElement(Element element) {
if(element instanceof Stanza) {
Stanza stanza = (Stanza)element;
if (State.Initialized.equals(getState())) {
onStanzaReceived.emit(stanza);
}
else {
finishSession(Error.Type.UnexpectedElementError);
}
}
else if (element instanceof ComponentHandshake) {
if (!checkState(State.Authenticating)) {
return;
}
stream.setWhitespacePingEnabled(true);
state = State.Initialized;
onInitialized.emit();
}
else if (State.Authenticating.equals(getState())) {
if (element instanceof StreamFeatures) {
// M-Link sends stream features, so swallow that.
}
else {
// FIXME: We should actually check the element received
finishSession(Error.Type.AuthenticationFailedError);
}
}
else {
finishSession(Error.Type.UnexpectedElementError);
}
}
private void handleStreamStart(final ProtocolHeader header) {
checkState(State.WaitingForStreamStart);
state = State.Authenticating;
stream.writeElement(new ComponentHandshake(ComponentHandshakeGenerator.getHandshake(header.getID(), secret, crypto)));
}
private void handleStreamClosed(SessionStream.Error streamError) {
State oldState = state;
state = State.Finished;
stream.setWhitespacePingEnabled(false);
onStreamStartReceivedConnection.disconnect();
onElementReceivedConnection.disconnect();
onClosedConnection.disconnect();
if (State.Finishing.equals(oldState)) {
onFinished.emit(error);
}
else {
onFinished.emit(streamError);
}
}
private boolean checkState(State state) {
if (!(this.state.equals(state))) {
finishSession(Error.Type.UnexpectedElementError);
return false;
}
return true;
}
}
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Swift