5 files changed, 1176 insertions, 2 deletions
diff --git a/src/com/isode/stroke/network/BOSHConnection.java b/src/com/isode/stroke/network/BOSHConnection.java
new file mode 100644
index 0000000..43b990d
--- /dev/null
+++ b/src/com/isode/stroke/network/BOSHConnection.java
@@ -0,0 +1,527 @@
+/*  Copyright (c) 2016, Isode Limited, London, England.
+ *  All rights reserved.
+ *
+ *  Acquisition and use of this software and related materials for any
+ *  purpose requires a written license agreement from Isode Limited,
+ *  or a written license from an organisation licensed by Isode Limited
+ *  to grant such a license.
+ *
+ */
+package com.isode.stroke.network;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import com.isode.stroke.base.ByteArray;
+import com.isode.stroke.base.Error;
+import com.isode.stroke.base.SafeByteArray;
+import com.isode.stroke.base.URL;
+import com.isode.stroke.network.BOSHConnection.BOSHError.Type;
+import com.isode.stroke.parser.BOSHBodyExtractor;
+import com.isode.stroke.parser.BOSHBodyExtractor.BOSHBody;
+import com.isode.stroke.parser.XMLParserFactory;
+import com.isode.stroke.session.SessionStream.SessionStreamError;
+import com.isode.stroke.signals.Signal1;
+import com.isode.stroke.signals.Signal2;
+import com.isode.stroke.signals.SignalConnection;
+import com.isode.stroke.signals.Slot;
+import com.isode.stroke.signals.Slot1;
+import com.isode.stroke.signals.Slot2;
+import com.isode.stroke.streamstack.DummyStreamLayer;
+import com.isode.stroke.streamstack.HighLayer;
+import com.isode.stroke.streamstack.TLSLayer;
+import com.isode.stroke.tls.Certificate;
+import com.isode.stroke.tls.CertificateVerificationError;
+import com.isode.stroke.tls.CertificateWithKey;
+import com.isode.stroke.tls.TLSContextFactory;
+import com.isode.stroke.tls.TLSError;
+import com.isode.stroke.tls.TLSOptions;
+
+public class BOSHConnection {
+
+    private final URL boshURL_;
+    private Connector connector_;
+    private final XMLParserFactory parserFactory_;
+    private Connection connection_;
+    private final HighLayer dummyLayer_;
+    private final TLSLayer tlsLayer_;
+    private String sid_ = "";
+    private boolean waitingForStartResponse_ = false;
+    private long rid_ = 0;
+    private final SafeByteArray buffer_ = new SafeByteArray();
+    private boolean pending_ = false;
+    private boolean connectionReady_ = false;
+    
+    public final Signal1<Boolean> onConnectionFinished = new Signal1<Boolean>();
+    public final Signal1<Boolean> onDisconnected = new Signal1<Boolean>();
+    public final Signal1<BOSHError> onSessionTerminated = new Signal1<BOSHError>();
+    public final Signal2<String, Integer> onSessionStarted = new Signal2<String, Integer>();
+    public final Signal1<SafeByteArray> onXMPPDataRead = new Signal1<SafeByteArray>();
+    public final Signal1<SafeByteArray> onBOSHDataRead = new Signal1<SafeByteArray>();
+    public final Signal1<SafeByteArray> onBOSHDataWritten = new Signal1<SafeByteArray>();
+    public final Signal1<String> onHTTPError = new Signal1<String>();
+    
+    private final Logger logger = Logger.getLogger(this.getClass().getName());
+    private SignalConnection onConnectFinishedConnection;
+    
+    public static class BOSHError extends com.isode.stroke.session.SessionStream.SessionStreamError {
+        
+        public enum Type {
+            BadRequest, HostGone, HostUnknown, ImproperAddressing,
+            InternalServerError, ItemNotFound, OtherRequest, PolicyViolation,
+            RemoteConnectionFailed,RemoteStreamError,SeeOtherURI,SystemShutdown,
+            UndefinedCondition,NoError;
+        }
+        
+        public BOSHError(Type type) {
+            super(SessionStreamError.Type.ConnectionReadError);
+            type_ = type;
+        }
+        
+        public Type getType() {
+            return type_;
+        }
+        
+        private final Type type_;
+        
+    }
+    
+    public static class Pair<T1,T2> {
+        public final T1 first;
+        public final T2 second;
+        
+        public Pair(T1 first,T2 second) {
+           this.first = first;
+           this.second = second;
+        }
+    }
+    
+    private BOSHConnection(URL url,Connector connector,XMLParserFactory parserFactory,
+            TLSContextFactory tlsContextFactory,TLSOptions tlsOptions) {
+        boshURL_ = url;
+        connector_ = connector;
+        parserFactory_ = parserFactory;
+        if ("https".equals(boshURL_.getScheme())) {
+            tlsLayer_ = new TLSLayer(tlsContextFactory, tlsOptions);
+            dummyLayer_ = new DummyStreamLayer(tlsLayer_);
+        }
+        else {
+            tlsLayer_ = null;
+            dummyLayer_ = null;
+        }
+    }
+    
+    public static BOSHConnection create(URL url,Connector connector,
+            XMLParserFactory parserFactory,TLSContextFactory tlsContextFactory,TLSOptions tlsOptions) {
+        return new BOSHConnection(url, connector, parserFactory, tlsContextFactory, tlsOptions);
+    }
+    
+    public void connect() {
+        onConnectFinishedConnection = connector_.onConnectFinished.connect(new Slot2<Connection, Error>() {
+            
+            @Override
+            public void call(Connection connection, Error error) {
+                handleConnectFinished(connection);
+            }
+            
+        });
+        connector_.start();
+    }
+    
+    public void disconnect() {
+        if (connection_ != null) {
+            connection_.disconnect();
+            sid_ = "";
+        }
+        else {
+            handleDisconnected(null);
+        }
+    }
+    
+    public void write(SafeByteArray data) {
+        write(data,false,false);
+    }
+    
+    private void write(SafeByteArray data, boolean streamRestart, boolean terminate) {
+        assert(connectionReady_);
+        assert(!sid_.isEmpty());
+
+        SafeByteArray safeHeader =
+                createHTTPRequest(data, streamRestart, terminate, rid_, sid_, boshURL_).first;
+
+        onBOSHDataWritten.emit(safeHeader);
+        writeData(safeHeader);
+        pending_ = true;
+
+        String logMessage = "write data: " + safeHeader.toString() + "\n";
+        logger.log(Level.FINE,logMessage);
+    }
+
+    public String getSID() {
+        return sid_;
+    }
+    
+    public void setRID(long rid) {
+        rid_ = rid;
+    }
+    
+    public void setSID(String sid) {
+        sid_ = sid;
+    }
+    
+    public void startStream(String to,long rid) {
+        assert(connectionReady_);
+        
+        String content = "<body content='text/xml; charset=utf-8'"
+                + " hold='1'"
+                + " to='" + to + "'"
+                + " rid='" + rid + "'"
+                + " ver='1.6'"
+                + " wait='60'" 
+                + " xml:lang='en'"
+                + " xmlns:xmpp='urn:xmpp:bosh'"
+                + " xmpp:version='1.0'"
+                + " xmlns='http://jabber.org/protocol/httpbind' />";
+
+        StringBuilder headerBuilder = new StringBuilder("POST " + boshURL_.getPath() + " HTTP/1.1\r\n"
+                + "Host: " + boshURL_.getHost());
+        Integer boshPort = boshURL_.getPort();
+        if (boshPort != null) {
+            headerBuilder.append(":");
+            headerBuilder.append(boshPort);
+        }
+        headerBuilder.append("\r\n");
+        headerBuilder.append("Accept-Encoding: deflate\r\n");
+        headerBuilder.append("Content-Type: text/xml; charset=utf-8\r\n");
+        headerBuilder.append("Content-Length: ");
+        headerBuilder.append(content.length());
+        headerBuilder.append("\r\n\r\n");
+        headerBuilder.append(content);
+        
+        waitingForStartResponse_ = true;
+        SafeByteArray safeHeader = new SafeByteArray(headerBuilder.toString());
+        onBOSHDataWritten.emit(safeHeader);
+        writeData(safeHeader);
+        logger.fine("write stream header: "+safeHeader.toString()+"\n");
+    }
+    
+    public void terminateStream() {
+        write(new SafeByteArray(),false,true);
+    }
+    
+    public boolean isReadyToSend() {
+        // Without pipelining you need to not send more without first receiving the response
+        // With pipelining you can. Assuming we can't, here
+        return connectionReady_ && !pending_ && !waitingForStartResponse_ && !sid_.isEmpty();
+    }
+    
+    public void restartStream() {
+        write(new SafeByteArray(),true,false);
+    }
+    
+    public boolean setClientCertificate(CertificateWithKey cert) {
+        if (tlsLayer_ != null) {
+            logger.fine("set client certificate\n");
+            return tlsLayer_.setClientCertificate(cert);
+        }
+        else {
+            return false;
+        }
+    }
+    
+    public Certificate getPeerCertificate() {
+        if (tlsLayer_ != null) {
+            return tlsLayer_.getPeerCertificate();
+        }
+        return null;
+    }
+    
+    public CertificateVerificationError getPeerCertificateVerficationError() {
+        if (tlsLayer_ != null) {
+            return tlsLayer_.getPeerCertificateVerificationError();
+        }
+        return null;
+    }
+    
+    public List<Certificate> getPeerCertificateChain() {
+        if (tlsLayer_ != null) {
+            return tlsLayer_.getPeerCertificateChain();
+        }
+        return new ArrayList<Certificate>();
+    }
+    
+    protected static Pair<SafeByteArray,Integer> createHTTPRequest(SafeByteArray data,
+            boolean streamRestart,boolean terminate,long rid,String sid,URL boshURL) {
+        int size = 0;
+        StringBuilder contentBuilder = new StringBuilder();
+        SafeByteArray contentTail = new SafeByteArray("</body>");
+        StringBuilder headerBuilder = new StringBuilder();
+        
+        contentBuilder.append("<body rid='");
+        contentBuilder.append(rid);
+        contentBuilder.append("' sid='");
+        contentBuilder.append(sid);
+        contentBuilder.append("'");
+        if (streamRestart) {
+            contentBuilder.append(" xmpp:restart='true' xmlns:xmpp='urn:xmpp:xbosh'");
+        }
+        if (terminate) {
+            contentBuilder.append(" type='terminate'");
+        }
+        contentBuilder.append(" xmlns='http://jabber.org/protocol/httpbind'>");
+        
+        SafeByteArray safeContent = new SafeByteArray(contentBuilder.toString());
+        safeContent.append(data);
+        safeContent.append(contentTail);
+        
+        size = safeContent.getSize();
+        
+        headerBuilder.append("POST " + boshURL.getPath() + " HTTP/1.1\r\n"
+                + "Host: " + boshURL.getHost());
+        Integer boshPort = boshURL.getPort();
+        if (boshPort != null) {
+            headerBuilder.append(":");
+            headerBuilder.append(boshPort);
+        }
+        headerBuilder.append("\r\n");
+        headerBuilder.append("Accept-Encoding: deflate\r\n");
+        headerBuilder.append("Content-Type: text/xml; charset=utf-8\r\n");
+        headerBuilder.append("Content-Length: ");
+        headerBuilder.append(size);
+        headerBuilder.append("\r\n\r\n");
+        
+        SafeByteArray safeHeader = new SafeByteArray(headerBuilder.toString());
+        safeHeader.append(safeContent);
+        
+        return new Pair<SafeByteArray, Integer>(safeHeader, size);
+    }
+    
+    private void handleConnectFinished(Connection connection) {
+        cancelConnector();
+        connectionReady_ = (connection != null);
+        if (connectionReady_) {
+            connection_ = connection;
+            if (tlsLayer_ != null) {
+                connection_.onDataRead.connect(new Slot1<SafeByteArray>() {
+
+                    @Override
+                    public void call(SafeByteArray data) {
+                        handleRawDataRead(data);
+                    }
+
+                });
+                connection_.onDisconnected.connect(new Slot1<Connection.Error>() {
+
+                    @Override
+                    public void call(
+                            com.isode.stroke.network.Connection.Error error) {
+                        handleDisconnected(error);
+                    }
+
+                });
+
+                tlsLayer_.getContext().onDataForNetwork.connect(new Slot1<SafeByteArray>() {
+
+                    @Override
+                    public void call(SafeByteArray data) {
+                        handleTLSNetworkDataWriteRequest(data);
+                    }
+
+                });
+                tlsLayer_.getContext().onDataForApplication.connect(new Slot1<SafeByteArray>() {
+
+                    @Override
+                    public void call(SafeByteArray data) {
+                        handleTLSApplicationDataRead(data);
+                    }
+
+                });
+
+                tlsLayer_.onConnected.connect(new Slot() {
+
+                    @Override
+                    public void call() {
+                        handleTLSConnected();
+                    }
+
+                });
+
+                tlsLayer_.onError.connect(new Slot1<TLSError>() {
+
+                    @Override
+                    public void call(TLSError error) {
+                        handleTLSError(error);
+                    }
+
+                });
+                tlsLayer_.connect();
+            }
+            else {
+                connection_.onDataRead.connect(new Slot1<SafeByteArray>() {
+
+                    @Override
+                    public void call(SafeByteArray data) {
+                        handleDataRead(data);
+                    }
+
+                });
+                connection_.onDisconnected.connect(new Slot1<Connection.Error>() {
+
+                    @Override
+                    public void call(Connection.Error error) {
+                        handleDisconnected(error);
+                    }
+
+                });
+            }
+
+            if (!connectionReady_ || tlsLayer_ == null) {
+                onConnectionFinished.emit(!connectionReady_);
+            }
+        }
+    }
+    
+    private void handleDataRead(SafeByteArray data) {
+        onBOSHDataRead.emit(data);
+        buffer_.append(data);
+        String response = buffer_.toString();
+        if (!response.contains("\r\n\r\n")) {
+            onBOSHDataRead.emit(new SafeByteArray("[[Previous read incomplete, pending]]"));
+            return;
+        }
+        int httpCodeIndex = response.indexOf(" ")+1;
+        String httpCode = response.substring(httpCodeIndex,httpCodeIndex+3);
+        if (!"200".equals(httpCode)) {
+            onHTTPError.emit(httpCode);
+            return;
+        }
+        ByteArray boshData = new ByteArray(response.substring(response.indexOf("\r\n\r\n")));
+        BOSHBodyExtractor parser = new BOSHBodyExtractor(parserFactory_, boshData);
+        BOSHBody boshBody = parser.getBody();
+        if (boshBody != null) {
+            String typeAttribute = boshBody.getAttributes().getAttribute("type");
+            if ( "terminate".equals(typeAttribute) ) {
+                String conditionAttribute = boshBody.getAttributes().getAttribute("condition");
+                BOSHError.Type errorType = parseTerminationCondition(conditionAttribute);
+                onSessionTerminated.emit(errorType == BOSHError.Type.NoError ? null : new BOSHError(errorType));
+            }
+            buffer_.clear();
+            if (waitingForStartResponse_) {
+                waitingForStartResponse_ = false;
+                sid_ = boshBody.getAttributes().getAttribute("sid");
+                String requestsString = boshBody.getAttributes().getAttribute("requests");
+                Integer requests = Integer.valueOf(2);
+                if (requestsString != null && !requestsString.isEmpty()) {
+                    try {
+                        requests = Integer.valueOf(requestsString);
+                    } catch (NumberFormatException e) {
+                        requests = Integer.valueOf(2);
+                    }
+                }
+                onSessionStarted.emit(sid_, requests);
+            }
+            
+            SafeByteArray payload = new SafeByteArray(boshBody.getContent());
+            /* Say we're good to go again, so don't add anything after here in the method */
+            pending_ = false;
+            onXMPPDataRead.emit(payload);
+        }
+    }
+    
+    private void handleDisconnected(Connection.Error error) {
+        cancelConnector();
+        onDisconnected.emit(error != null ? Boolean.TRUE : Boolean.FALSE);
+        sid_ = "";
+        connectionReady_ = false;
+    }
+    
+    private Type parseTerminationCondition(String text) {
+        Type condition = Type.UndefinedCondition;
+        if ("bad-request".equals(text)) {
+            condition = Type.BadRequest;
+        }
+        else if ("host-gone".equals(text)) {
+            condition = Type.HostGone;
+        }
+        else if ("host-unknown".equals(text)) {
+            condition = Type.HostUnknown;
+        }
+        else if ("improper-addressing".equals(text)) {
+            condition = Type.ImproperAddressing;
+        }
+        else if ("internal-server-error".equals(text)) {
+            condition = Type.InternalServerError;
+        }
+        else if ("item-not-found".equals(text)) {
+            condition = Type.ItemNotFound;
+        }
+        else if ("other-request".equals(text)) {
+            condition = Type.OtherRequest;
+        }
+        else if ("policy-violation".equals(text)) {
+            condition = Type.PolicyViolation;
+        }
+        else if ("remote-connection-failed".equals(text)) {
+            condition = Type.RemoteConnectionFailed;
+        }
+        else if ("remote-stream-error".equals(text)) {
+            condition = Type.RemoteStreamError;
+        }
+        else if ("see-other-uri".equals(text)) {
+            condition = Type.SeeOtherURI;
+        }
+        else if ("system-shutdown".equals(text)) {
+            condition = Type.SystemShutdown;
+        }
+        else if ("".equals(text)) {
+            condition = Type.NoError;
+        }
+        return condition;
+    }
+    
+    private void cancelConnector() {
+        if (connector_ != null) {
+            if (onConnectFinishedConnection != null) {
+                onConnectFinishedConnection.disconnect();
+            }
+            connector_.stop();
+            connector_ = null;
+        }
+    }
+
+    private void handleTLSConnected() {
+        logger.fine("\n");
+        onConnectionFinished.emit(Boolean.FALSE);
+    }
+    
+    private void handleTLSApplicationDataRead(SafeByteArray data) {
+        logger.fine("\n");
+        handleDataRead(new SafeByteArray(data));
+    }
+    
+    private void handleTLSNetworkDataWriteRequest(SafeByteArray data) {
+        logger.fine("\n");
+        connection_.write(data);
+    }
+    
+    private void handleRawDataRead(SafeByteArray data) {
+        logger.fine("\n");
+        tlsLayer_.handleDataRead(data);
+    }
+    
+    private void handleTLSError(TLSError error) {
+        // Empty Method
+    }
+
+    private void writeData(SafeByteArray data) {
+        if (tlsLayer_ != null) {
+            tlsLayer_.writeData(data);
+        }
+        else {
+            connection_.write(data);
+        }
+    }
+
+}
diff --git a/src/com/isode/stroke/network/BOSHConnectionPool.java b/src/com/isode/stroke/network/BOSHConnectionPool.java
new file mode 100644
index 0000000..9eefb83
--- /dev/null
+++ b/src/com/isode/stroke/network/BOSHConnectionPool.java
@@ -0,0 +1,417 @@
+/*  Copyright (c) 2016, Isode Limited, London, England.
+ *  All rights reserved.
+ *
+ *  Acquisition and use of this software and related materials for any
+ *  purpose requires a written license agreement from Isode Limited,
+ *  or a written license from an organisation licensed by Isode Limited
+ *  to grant such a license.
+ *
+ */
+package com.isode.stroke.network;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Logger;
+
+import com.isode.stroke.base.SafeByteArray;
+import com.isode.stroke.base.SafeString;
+import com.isode.stroke.base.URL;
+import com.isode.stroke.eventloop.EventLoop;
+import com.isode.stroke.network.BOSHConnection.BOSHError;
+import com.isode.stroke.parser.XMLParserFactory;
+import com.isode.stroke.signals.Signal;
+import com.isode.stroke.signals.Signal1;
+import com.isode.stroke.signals.SignalConnection;
+import com.isode.stroke.signals.Slot1;
+import com.isode.stroke.signals.Slot2;
+import com.isode.stroke.tls.Certificate;
+import com.isode.stroke.tls.CertificateVerificationError;
+import com.isode.stroke.tls.CertificateWithKey;
+import com.isode.stroke.tls.TLSContextFactory;
+import com.isode.stroke.tls.TLSOptions;
+
+public class BOSHConnectionPool {
+
+    private final URL boshURL_;
+    private ConnectionFactory connectionFactory_;
+    private final XMLParserFactory xmlParserFactory_;
+    private final TimerFactory timerFactory_;
+    private final List<BOSHConnection> connections_ = new ArrayList<BOSHConnection>();
+    private final Map<BOSHConnection, Set<SignalConnection>> connectionsSignalConnections_
+        = new HashMap<BOSHConnection, Set<SignalConnection>>();
+    private String sid_ = "";
+    private long rid_;
+    private final List<SafeByteArray> dataQueue_ = new ArrayList<SafeByteArray>();
+    private boolean pendingTerminate_;
+    private String to_;
+    private int requestLimit_;
+    private int restartCount_;
+    private boolean pendingRestart_;
+    private List<ConnectionFactory> myConnectionFactories_;
+    private final CachingDomainNameResolver resolver_;
+    private CertificateWithKey clientCertificate_;
+    private TLSContextFactory tlsContextFactory_;
+    private TLSOptions tlsOptions_;
+    private final List<Certificate> pinnedCertificateChain_ = new ArrayList<Certificate>();
+    private CertificateVerificationError lastVerificationError_;
+    
+    public final Signal1<BOSHError> onSessionTerminated = new Signal1<BOSHError>();
+    public final Signal onSessionStarted = new Signal();
+    public final Signal1<SafeByteArray> onXMPPDataRead = new Signal1<SafeByteArray>();
+    public final Signal1<SafeByteArray> onBOSHDataRead = new Signal1<SafeByteArray>();
+    public final Signal1<SafeByteArray> onBOSHDataWritten = new Signal1<SafeByteArray>();
+    
+    private final Logger logger = Logger.getLogger(this.getClass().getName());
+
+    public BOSHConnectionPool(URL boshURL,DomainNameResolver resolver,
+            ConnectionFactory connectionFactory, XMLParserFactory parserFactory,
+            TLSContextFactory tlsFactory, TimerFactory timerFactory, EventLoop eventLoop,
+            String to,long initialRID,URL boshHTTPConnectProxyURL,
+            SafeString boshHTTPConnectProxyAuthID,SafeString boshHTTPConnectProxyAuthPassword,
+            TLSOptions tlsOptions) {
+        this(boshURL, resolver, connectionFactory, parserFactory, tlsFactory, timerFactory, 
+                eventLoop, to, initialRID, boshHTTPConnectProxyURL, boshHTTPConnectProxyAuthID, 
+                boshHTTPConnectProxyAuthPassword, tlsOptions, null);
+    }
+    
+    public BOSHConnectionPool(URL boshURL,DomainNameResolver realResolver,
+            ConnectionFactory connectionFactory, XMLParserFactory parserFactory,
+            TLSContextFactory tlsFactory, TimerFactory timerFactory, EventLoop eventLoop,
+            String to,long initialRID,URL boshHTTPConnectProxyURL,
+            SafeString boshHTTPConnectProxyAuthID,SafeString boshHTTPConnectProxyAuthPassword,
+            TLSOptions tlsOptions,HTTPTrafficFilter trafficFilter) {
+        boshURL_ = boshURL;
+        connectionFactory_ = connectionFactory;
+        xmlParserFactory_ = parserFactory;
+        timerFactory_ = timerFactory;
+        rid_ = initialRID;
+        pendingTerminate_ = false;
+        to_ = to;
+        requestLimit_ = 2;
+        restartCount_ = 0;
+        pendingRestart_ = false;
+        tlsContextFactory_ = tlsFactory;
+        tlsOptions_ = tlsOptions;
+        if (!boshHTTPConnectProxyURL.isEmpty()) {
+            this.connectionFactory_ = 
+                    new HTTPConnectProxiedConnectionFactory(realResolver, connectionFactory, 
+                            timerFactory, boshHTTPConnectProxyURL.getHost(), 
+                            URL.getPortOrDefaultPort(boshHTTPConnectProxyURL), 
+                            boshHTTPConnectProxyAuthID.getData(), 
+                            boshHTTPConnectProxyAuthPassword.getData(), trafficFilter);
+        }
+        resolver_ = new CachingDomainNameResolver(realResolver, eventLoop);
+    }
+    
+    public void open() {
+        createConnection();
+    }
+    
+    public void write(SafeByteArray data) {
+        dataQueue_.add(data);
+        tryToSendQueuedData();
+    }
+    
+    public void writeFooter() {
+        pendingTerminate_ = true;
+        tryToSendQueuedData();
+    }
+    
+    public void close() {
+        if (!sid_.isEmpty()) {
+            writeFooter();
+        }
+        else {
+            pendingTerminate_ = true;
+            List<BOSHConnection> connectionCopies = new ArrayList<BOSHConnection>(connections_);
+            for(BOSHConnection connection : connectionCopies) {
+                if (connection != null) {
+                    connection.disconnect();
+                }
+            }
+        }
+    }
+    
+    public void restartStream() {
+        BOSHConnection connection = getSuitableConnection();
+        if (connection != null) {
+            pendingRestart_ = false;
+            rid_++;
+          connection.setRID(rid_);
+          connection.restartStream();
+          restartCount_++;
+        }
+        else {
+            pendingRestart_ = true;
+        }
+    }
+    
+    public void setTLSCertificate(CertificateWithKey certWithKey) {
+        clientCertificate_ = certWithKey;
+    }
+
+    public boolean isTLSEncrypted() {
+        return !pinnedCertificateChain_.isEmpty();
+    }
+
+    public Certificate getPeerCertificate() {
+        Certificate peerCertificate = null;
+        if (!pinnedCertificateChain_.isEmpty()) {
+            peerCertificate = pinnedCertificateChain_.get(0);
+        }
+        return peerCertificate;
+    }
+    
+    
+    public List<Certificate> getPeerCertificateChain() {
+        return new ArrayList<Certificate>(pinnedCertificateChain_);
+    }
+    
+    public CertificateVerificationError getPeerCertificateVerificationError() {
+        return lastVerificationError_;
+    }
+    
+    private void handleDataRead(SafeByteArray data) {
+        onXMPPDataRead.emit(data);
+        tryToSendQueuedData(); // Will rebalance the connections 
+    }
+    
+    private void handleSessionStarted(String sid, int requests) {
+        sid_ = sid;
+        requestLimit_ = requests;
+        onSessionStarted.emit();
+    }
+    
+    private void handleBOSHDataRead(SafeByteArray data) {
+        onBOSHDataRead.emit(data);
+    }
+    
+    private void handleBOSHDataWritten(SafeByteArray data) {
+        onBOSHDataWritten.emit(data);
+    }
+    
+    private void handleSessionTerminated(BOSHError error) {
+        onSessionTerminated.emit(error);
+    }
+    
+    private void handleConnectFinished(boolean error, BOSHConnection connection) {
+        if (error) {
+            onSessionTerminated.emit(new BOSHError(BOSHError.Type.UndefinedCondition));
+        }
+        else {
+            if ((connection.getPeerCertificate() != null) && pinnedCertificateChain_.isEmpty()) {
+                pinnedCertificateChain_.clear();
+                pinnedCertificateChain_.addAll(connection.getPeerCertificateChain());
+            }
+            if (!pinnedCertificateChain_.isEmpty()) {
+                lastVerificationError_ = connection.getPeerCertificateVerficationError();
+            }
+
+            if (sid_.isEmpty()) {
+                connection.startStream(to_, rid_);
+            }
+            if (pendingRestart_) {
+                restartStream();
+            }
+            tryToSendQueuedData();
+        }
+    }
+    
+    private void handleConnectionDisconnected(boolean error, BOSHConnection connection) {
+        destroyConnection(connection);
+        if (pendingTerminate_ && sid_.isEmpty() && connections_.isEmpty()) {
+            handleSessionTerminated(null);
+        }
+        else {
+            /* We might have just freed up a connection slot to send with */
+            tryToSendQueuedData();
+        }
+    }
+    
+    private void handleHTTPError(String errorCode) {
+        handleSessionTerminated(new BOSHError(BOSHError.Type.UndefinedCondition));
+    }
+    
+    private BOSHConnection createConnection() {
+        Connector connector = Connector.create(boshURL_.getHost(), 
+                URL.getPortOrDefaultPort(boshURL_), null, resolver_, 
+                connectionFactory_, timerFactory_);
+        final BOSHConnection connection = BOSHConnection.create(boshURL_, connector, 
+                xmlParserFactory_, tlsContextFactory_, tlsOptions_);
+        Set<SignalConnection> signalConnections = new HashSet<SignalConnection>();
+        signalConnections.add(connection.onXMPPDataRead.connect(new Slot1<SafeByteArray>() {
+            
+            @Override
+            public void call(SafeByteArray data) {
+                handleDataRead(data);
+            }
+            
+        }));
+        signalConnections.add(connection.onSessionStarted.connect(new Slot2<String, Integer>() {
+            
+            @Override
+            public void call(String sid, Integer requests) {
+                handleSessionStarted(sid, requests.intValue());
+            }
+            
+        }));
+        signalConnections.add(connection.onBOSHDataRead.connect(new Slot1<SafeByteArray>() {
+
+            @Override
+            public void call(SafeByteArray data) {
+                handleBOSHDataRead(data);
+            }
+            
+        }));
+        signalConnections.add(connection.onBOSHDataWritten.connect(new Slot1<SafeByteArray>() {
+
+            @Override
+            public void call(SafeByteArray data) {
+                handleBOSHDataWritten(data);
+            }
+            
+        }));
+        signalConnections.add(connection.onDisconnected.connect(new Slot1<Boolean>() {
+
+            @Override
+            public void call(Boolean wasError) {
+                handleConnectionDisconnected(wasError.booleanValue(), connection);
+            }
+            
+        }));
+        signalConnections.add(connection.onConnectionFinished.connect(new Slot1<Boolean>() {
+
+            @Override
+            public void call(Boolean wasError) {
+                handleConnectFinished(wasError.booleanValue(), connection);
+            }
+            
+        }));
+        signalConnections.add(connection.onSessionTerminated.connect(new Slot1<BOSHConnection.BOSHError>() {
+
+            @Override
+            public void call(BOSHError error) {
+                handleSessionTerminated(error);
+            }
+            
+        }));
+        signalConnections.add(connection.onHTTPError.connect(new Slot1<String>() {
+
+            @Override
+            public void call(String httpErrorCode) {
+                handleHTTPError(httpErrorCode);
+            }
+            
+        }));
+
+        if ("https".equals(boshURL_.getScheme())) {
+            boolean success = connection.setClientCertificate(clientCertificate_);
+            logger.fine("setClientCertificate, success: " + success + "\n");
+        }
+
+        connection.connect();
+        connections_.add(connection);
+        connectionsSignalConnections_.put(connection, signalConnections);
+        return connection;
+        
+    }
+    
+    private void destroyConnection(BOSHConnection connection) {
+          while (connections_.remove(connection)) {
+              // Loop will run till all instances of connection are removed
+          }
+          Set<SignalConnection> signalConnections = connectionsSignalConnections_.remove(connection);
+          if (signalConnections != null) {
+              for (SignalConnection signalConnection : signalConnections) {
+                  if (signalConnection != null) {
+                      signalConnection.disconnect();
+                  }
+              }
+              signalConnections.clear();
+          }
+    }
+    
+    private void tryToSendQueuedData() {
+        if (sid_.isEmpty()) {
+            // If we've not got as far as stream start yet, pend 
+            return;
+        }
+
+        BOSHConnection suitableConnection = getSuitableConnection();
+        boolean toSend = !dataQueue_.isEmpty();
+        if (suitableConnection != null) {
+            if (toSend) {
+                rid_++;
+                suitableConnection.setRID(rid_);
+                SafeByteArray data = new SafeByteArray();
+                for(SafeByteArray datum : dataQueue_) {
+                    data.append(datum);
+                }
+                suitableConnection.write(data);
+                dataQueue_.clear();
+            }
+            else if (pendingTerminate_) {
+                rid_++;
+                suitableConnection.setRID(rid_);
+                suitableConnection.terminateStream();
+                sid_ = "";
+                close();
+            }
+        }
+        if (!pendingTerminate_) {
+            // Ensure there's always a session waiting to read data for us
+            boolean pending = false;
+            for(BOSHConnection connection : connections_) {
+                if (connection != null && !connection.isReadyToSend()) {
+                    pending = true;
+                }
+            }
+            if (!pending) {
+                if (restartCount_ >= 1) {
+                    // Don't open a second connection until we've restarted the stream twice - i.e. we've authed and resource bound
+                    if (suitableConnection != null) {
+                        rid_++;
+                        suitableConnection.setRID(rid_);
+                        suitableConnection.write(new SafeByteArray());
+                    }
+                    else {
+                        // My thought process I went through when writing this, to aid anyone else confused why this can happen...
+                        //
+                        // What to do here? I think this isn't possible.
+                        // If you didn't have two connections, suitable would have made one.
+                        // If you have two connections and neither is suitable, pending would be true.
+                        // If you have a non-pending connection, it's suitable.
+                        //
+                        // If I decide to do something here, remove assert above.
+                        //
+                        // Ah! Yes, because there's a period between creating the connection and it being connected. */
+                    }
+                }
+            }
+        }
+    }
+    
+    private BOSHConnection getSuitableConnection() {
+        BOSHConnection suitableConnection = null;
+        for(BOSHConnection connection : connections_) {
+            if (connection.isReadyToSend()) {
+                suitableConnection = connection;
+                break;
+            }
+        }
+
+        if (suitableConnection == null && (connections_.size() < requestLimit_)) {
+            // This is not a suitable connection because it won't have yet connected and added TLS if needed.
+            BOSHConnection newConnection = createConnection();
+            newConnection.setSID(sid_);
+        }
+        assert(connections_.size() <= requestLimit_);
+        assert((suitableConnection == null) || suitableConnection.isReadyToSend());
+        return suitableConnection;
+    }
+    
+}
diff --git a/src/com/isode/stroke/parser/BOSHBodyExtractor.java b/src/com/isode/stroke/parser/BOSHBodyExtractor.java
new file mode 100644
index 0000000..6b637b1
--- /dev/null
+++ b/src/com/isode/stroke/parser/BOSHBodyExtractor.java
@@ -0,0 +1,174 @@
+/*  Copyright (c) 2016, Isode Limited, London, England.
+ *  All rights reserved.
+ *
+ *  Acquisition and use of this software and related materials for any
+ *  purpose requires a written license agreement from Isode Limited,
+ *  or a written license from an organisation licensed by Isode Limited
+ *  to grant such a license.
+ *
+ */
+package com.isode.stroke.parser;
+
+import java.util.Arrays;
+
+import com.isode.stroke.base.ByteArray;
+
+public class BOSHBodyExtractor {
+
+    private BOSHBody body = null;
+
+    public BOSHBodyExtractor(XMLParserFactory parserFactory,ByteArray data) {
+        // Look for the opening body element
+        byte[] rawData = data.getData();
+        int i = 0;
+        while (i < rawData.length && isWhitespace((char) rawData[i])) {
+            ++i;
+        }
+        if ((rawData.length - i) < 6 || rawData[i] != '<' || rawData[i+1] != 'b' 
+                || rawData[i+2] != 'o' || rawData[i+3] != 'd' || rawData[i+4] != 'y' 
+                || !isEndCharacter((char) rawData[i+5])) {
+            return;
+        }
+        i += 5;
+
+
+        // Parse until end of element
+        boolean inSingleQuote = false;
+        boolean inDoubleQuote = false;
+        boolean endStartTagSeen = false;
+        boolean endElementSeen = false;
+
+        for (; i < rawData.length; ++i) {
+            char c = (char) rawData[i];
+            if (inSingleQuote) {
+                if (c == '\'') {
+                    inSingleQuote = false;
+                }
+            }
+            else if (inDoubleQuote) {
+                if (c == '"') {
+                    inDoubleQuote = false;
+                }
+            }
+            else if (c == '\'') {
+                inSingleQuote = true;
+            }
+            else if (c == '"') {
+                inDoubleQuote = true;
+            }
+            else if (c == '/') {
+                if (i + 1 == rawData.length || rawData[i+1] != '>') {
+                    return;
+                }
+                else {
+                    endElementSeen = true;
+                    endStartTagSeen = true;
+                    i += 2;
+                    break;
+                }
+            }
+            else if (c == '>') {
+                endStartTagSeen = true;
+                i += 1;
+                break;
+            }
+        }
+
+        if (!endStartTagSeen) {
+            return;
+        }
+
+        // Look for the end of the element
+
+        int j = rawData.length - 1;
+        if (!endElementSeen) {
+            while (isWhitespace((char) rawData[j]) && j > -1) {
+                j--;
+            }
+
+            if (j == -1 || rawData[j] != '>') {
+                return;
+            }
+            j--;
+
+            while (j > -1 && isWhitespace((char) rawData[j])) {
+                j--;
+            }
+
+            if (j < 6 || rawData[j-5] != '<' || rawData[j-4] != '/' || rawData[j-3] != 'b' 
+                    || rawData[j-2] != 'o' || rawData[j-1] != 'd' || rawData[j] != 'y' ) {
+                return;
+            }
+
+            j -= 6;
+        }
+
+        body = new BOSHBody();
+
+        if (!endElementSeen) {
+            byte[] rawBodyContent =
+                    Arrays.copyOfRange(rawData, i, j+1);
+            body.content = (new ByteArray(rawBodyContent)).toString();
+        }
+
+        BOSHBodyParserClient parserClient = new BOSHBodyParserClient(this);
+        XMLParser parser = parserFactory.createParser(parserClient);
+        String stringToParse = data.toString().substring(0, i);
+        if(!parser.parse(stringToParse)) {
+            body = null;
+        }
+    }
+
+    public static boolean isWhitespace(char c) {
+        return c == ' ' || c == '\n' || c == '\t' || c == '\r';
+    }
+
+    private static boolean isEndCharacter(char c) {
+        return isWhitespace(c) || c == '>' || c == '/';
+    }
+
+    public BOSHBody getBody() {
+        return body;
+    }
+
+    public static class BOSHBody {
+        private AttributeMap attributes = new AttributeMap();
+        private String content  = "";
+        
+        public AttributeMap getAttributes() {
+            return attributes;
+        }
+        
+        public String getContent() {
+            return content;
+        }
+        
+    }
+
+    private final static class BOSHBodyParserClient implements XMLParserClient {
+
+        private BOSHBodyParserClient(BOSHBodyExtractor bodyExtractor) {
+            bodyExtractor_ = bodyExtractor;
+        }
+
+        @Override
+        public void handleStartElement(String element, String ns,
+                AttributeMap attributes) {
+            bodyExtractor_.body.attributes = attributes;
+        }
+
+        @Override
+        public void handleEndElement(String element, String ns) {
+            // Empty Method
+        }
+
+        @Override
+        public void handleCharacterData(String data) {
+            // Empty Method
+        }
+
+        private final BOSHBodyExtractor bodyExtractor_;
+
+    }
+
+}
diff --git a/src/com/isode/stroke/parser/PlatformXMLParserFactory.java b/src/com/isode/stroke/parser/PlatformXMLParserFactory.java
index 132dbe7..68281b1 100644
--- a/src/com/isode/stroke/parser/PlatformXMLParserFactory.java
+++ b/src/com/isode/stroke/parser/PlatformXMLParserFactory.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010-2012, Isode Limited, London, England.
+ * Copyright (c) 2010-2016, Isode Limited, London, England.
  * All rights reserved.
  */
 /*
@@ -10,9 +10,14 @@
 package com.isode.stroke.parser;
 
 
-public class PlatformXMLParserFactory {
+public class PlatformXMLParserFactory extends XMLParserFactory {
 
     public static XMLParser createXMLParser(XMLParserClient client) {
         return new AaltoXMLParser(client);
     }
+
+    @Override
+    public XMLParser createParser(XMLParserClient xmlParserClient) {
+        return createXMLParser(xmlParserClient);
+    }
 }
diff --git a/src/com/isode/stroke/streamstack/DummyStreamLayer.java b/src/com/isode/stroke/streamstack/DummyStreamLayer.java
new file mode 100644
index 0000000..7f3dd15
--- /dev/null
+++ b/src/com/isode/stroke/streamstack/DummyStreamLayer.java
@@ -0,0 +1,51 @@
+/*  Copyright (c) 2016, Isode Limited, London, England.
+ *  All rights reserved.
+ *
+ *  Acquisition and use of this software and related materials for any
+ *  purpose requires a written license agreement from Isode Limited,
+ *  or a written license from an organisation licensed by Isode Limited
+ *  to grant such a license.
+ *
+ */
+package com.isode.stroke.streamstack;
+
+import com.isode.stroke.base.SafeByteArray;
+
+/**
+ *  The {@link DummyStreamLayer} can be used to use a {@link LowLayer} on its own, 
+ *  without a functioning parent layer. The {@link DummyStreamLayer} will serve as the 
+ *  parent layer to the {@link LowLayer} and is called when the {@link LowLayer} wants 
+ *  to write data to its parent layer.
+ */
+public class DummyStreamLayer implements HighLayer {
+
+    private LowLayer childLayer;
+    
+    public DummyStreamLayer(LowLayer lowLayer) {
+        childLayer = lowLayer;
+        childLayer.setParentLayer(this);
+    }
+    
+    @Override
+    public void handleDataRead(SafeByteArray data) {
+        // Empty Method
+    }
+
+    @Override
+    public LowLayer getChildLayer() {
+        return childLayer;
+    }
+
+    @Override
+    public void setChildLayer(LowLayer childLayer) {
+        this.childLayer = childLayer;
+    }
+
+    @Override
+    public void writeDataToChildLayer(SafeByteArray data) {
+        if (childLayer != null) {
+            childLayer.writeData(data);
+        }
+    }
+
+}