/// <summary>
/// Stop and dispose xmpp-related source together with handlers
/// </summary>
public void StopXmppAndCleanup()
{
StopXmpp();
// Unsubscribe all handlers for xmpp subscription
OnIncomingPrintJobs = null;
OnXmppDebugLogging?.Invoke(this, "Clean up event handlers.");
OnXmppDebugLogging = null;
}
/// <summary>
/// Stop and dispose xmpp-related resource
/// </summary>
private void StopXmpp()
{
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Closing & Cleaning up socket connection with google.");
// Cleanup stream & client
if (_xmppSslStream != null)
{
_xmppSslStream.Dispose();
_xmppSslStream = null;
}
if (_xmppTcpClient != null)
{
_xmppTcpClient.Dispose();
_xmppTcpClient = null;
}
}
/// <summary>
/// Stop and dispose xmpp-related resource
/// </summary>
private void StopXmpp()
{
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Closing & Cleaning up socket connection with google.");
// Cleanup stream & client
if (_xmppSslStream != null)
{
_xmppSslStream.Dispose();
_xmppSslStream = null;
}
if (_xmppTcpClient != null)
{
_xmppTcpClient.Dispose();
_xmppTcpClient = null;
}
_started = false;
OnPrinterStopped?.Invoke(this, new EventArgs());
}
/// <summary>
/// Listener loop for subscribing google talk events
/// </summary>
/// <returns>Returns if the loop is manually break or not</returns>
private async Task <bool> ListenForIncomingJobsAsync()
{
// Async task to listen to google stream for new additions to joblist
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Listener loop started.");
// Only end when _xmppSslStream is cleaned up (set to null)
while (_xmppSslStream != null)
{
try
{
OnXmppDebugLogging?.Invoke(this, $"Xmpp Connection - Ping at '{DateTime.Now.ToUniversalTime()}'");
OnPing?.Invoke(this, new EventArgs());
// Asnynchronously wait for new xml incoming from google
var xmlDoc = await RecieveXmlAsync().ConfigureAwait(false);
if (xmlDoc != null && OnIncomingPrintJobs != null)
{
// If xml node matches 'push:data', it must contain incoming printjob notification from google
var pushData = xmlDoc.GetElementsByTagName("push:data");
if (pushData.Count > 0)
{
// Retrieve printerId & Log
var printerIdEncoded = pushData[0].InnerText;
var printerId = Encoding.UTF8.GetString(Convert.FromBase64String(printerIdEncoded));
OnXmppDebugLogging?.Invoke(this, $"Xmpp Connection: Recieved job addition event from printer '{printerId}'");
OnIncomingPrintJobs?.Invoke(this, new JobRecievedEventArgs {
PrinterId = printerId
});
}
}
}
catch (System.Exception ex)
{
OnXmppDebugLogging?.Invoke(this, $"Xmpp Connection - An Exception was thrown while listening to google, the listener loop is terminated. Exception: '{ex.Message}'");
StopXmpp();
return(false);
}
}
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Listener loop ended.");
return(true);
}
private async Task <XmlDocument> RecieveXmlAsync()
{
// asynchrnously recieve message from google & parse as xml if possible.
var xmlString = await RecieveAsync();
if (xmlString.Length <= 1)
{
return(null);
}
var strFormat = xmlString.Contains("<stream:stream") ? "{0}</stream:stream>" : "<stream:stream xmlns:stream=\"http://etherx.jabber.org/streams\">{0}</stream:stream>";
var validXmlString = string.Format(strFormat, xmlString);
XmlDocument xmlDoc = new XmlDocument();
try
{
xmlDoc.LoadXml(validXmlString);
}
catch (System.Exception ex)
{
OnXmppDebugLogging?.Invoke(this, $"Xmpp Connection - Failed to parse xml '{validXmlString}' with error '{ex.Message}', instead returning null as recieved XML...");
return(null);
}
return(xmlDoc);
}
public async Task InitXmppAsync(string xmppJid)
{
await UpdateTokenAsync().ConfigureAwait(false);
ConnectConversation = "\n[ConversationBegin]\n";
try
{
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Opening new socket connection with google.");
// Setup socket connection
_xmppTcpClient = new TcpClient();
await _xmppTcpClient.ConnectAsync(xmppServerHost, xmppServerPort).ConfigureAwait(false);
// Setup SSL Wrapper
var tcpStream = _xmppTcpClient.GetStream();
_xmppSslStream = new SslStream(tcpStream, false, new RemoteCertificateValidationCallback((s, c, ch, ss) => true), null);
// Authenticate
await _xmppSslStream.AuthenticateAsClientAsync(xmppServerHost).ConfigureAwait(false);
// Begin conversation with google
// 1st initial stream request
await SendAsync("<stream:stream to=\"gmail.com\" xml:lang=\"en\" version=\"1.0\" xmlns:stream=\"http://etherx.jabber.org/streams\" xmlns=\"jabber:client\">").ConfigureAwait(false);
var streamResp11 = await RecieveAsync().ConfigureAwait(false);
var streamResp12 = await RecieveAsync().ConfigureAwait(false);
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Authenticating with google.");
// Authenticate using Oauth2
var authB64 = Convert.ToBase64String(Encoding.UTF8.GetBytes($"\0{xmppJid}\0{_token.AccessToken}"));
await SendAsync("<auth xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\" mechanism=\"X-OAUTH2\" auth:service=\"oauth2\" xmlns:auth=\"http://www.google.com/talk/protocol/auth\">{0}</auth>", authB64).ConfigureAwait(false);
var authResp = await RecieveXmlAsync().ConfigureAwait(false);
if (authResp == null || authResp.GetElementsByTagName("success").Count < 1)
{
throw new GoogleCloudPrintException($"Xmpp Connection - Authentication failed, xmpp conversation: '{ConnectConversation}'.");
}
// 2nd stream request (now authenticated)
await SendAsync("<stream:stream to=\"gmail.com\" xml:lang=\"en\" version=\"1.0\" xmlns:stream=\"http://etherx.jabber.org/streams\" xmlns=\"jabber:client\">").ConfigureAwait(false);
var streamResp21 = await RecieveAsync().ConfigureAwait(false);
var streamResp22 = await RecieveAsync().ConfigureAwait(false);
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Subscribing to google cloud print events...");
// Bind Request (to retrieve jid)
await SendAsync("<iq type=\"set\" id=\"0\"><bind xmlns=\"urn:ietf:params:xml:ns:xmpp-bind\"><resource>cloud_print</resource></bind></iq>").ConfigureAwait(false);
var bindResp = await RecieveXmlAsync().ConfigureAwait(false);
if (bindResp == null)
{
throw new GoogleCloudPrintException($"Xmpp Connection - Bind failed, xmpp conversation: '{ConnectConversation}'.");
}
var fullJid = bindResp.GetElementsByTagName("jid")[0].InnerText;
var bareJid = fullJid.Substring(0, fullJid.IndexOf('/'));
// Establish session
await SendAsync("<iq type=\"set\" id=\"2\"><session xmlns=\"urn:ietf:params:xml:ns:xmpp-session\"/></iq>").ConfigureAwait(false);
var sessionResp1 = await RecieveAsync().ConfigureAwait(false);
var sessionResp2 = await RecieveAsync().ConfigureAwait(false);
// Use jid to now subscribe to google cloud print events
await SendAsync("<iq type=\"set\" id=\"3\" to=\"{0}\"><subscribe xmlns=\"google:push\"><item channel=\"cloudprint.google.com\" from=\"cloudprint.google.com\"/></subscribe></iq>", bareJid).ConfigureAwait(false);
var subscribeResp = await RecieveAsync().ConfigureAwait(false);
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Established connection to google and Subscribed to events successfully.");
// Finally begin asynchronously listening for events
new Task(async() =>
{
// Re-init the handshake if the loop is not manually break
if (!await ListenForIncomingJobsAsync().ConfigureAwait(false))
{
await InitXmppAsync(xmppJid).ConfigureAwait(false);
}
}).Start();
OnXmppDebugLogging?.Invoke(this, "Xmpp Connection - Ready.");
}
catch (GoogleCloudPrintException ex)
{
StopXmpp();
OnXmppDebugLogging?.Invoke(this, ex.Message);
throw ex;
}
catch (System.Exception ex)
{
StopXmpp();
var message = $"Xmpp Connection - Exception occured while attempting to establish secure stream with google exception: '{ex.Message}', conversation: '{ConnectConversation}'";
OnXmppDebugLogging?.Invoke(this, message);
throw new GoogleCloudPrintException(message);
}
}
