/**
* Connects to the server and upgrades to TLS connection if possible
*
* @return void
*/
public function connect()
{
// Figure out where we need to connect to
$server = $this->getServer();
try {
// Get a connection to server
$this->_stream = $this->getStream($server);
$this->_logger->debug('Connection made');
// Set the stream to blocking mode
$this->_stream->setBlocking(true);
$this->_logger->debug('Blocking enabled');
// Attempt to send the stream start
$this->startStream();
$this->_logger->debug('Wait for response from server');
// Now we will expect to get a stream tag back from the server. Not
// sure if we're supposed to do anything with it, so we'll just drop
// it for now. May contain the features the server supports.
$response = $this->waitForServer('stream:stream');
$this->_logger->debug('Received: ' . $response);
// If the response from the server does contain a features tag, don't
// bother querying server to get it.
// TODO - Xpath would probably be more sensible for this, but for
// now this'll work.
if (strpos($response->asXml(), '<stream:features') === false) {
// Server should now send back a features tag telling us what
// features it supports. If it tells us to start tls then we will
// need to change to a secure connection. It will also tell us what
// authentication methods it supports.
//
// Note we check for a "features" tag rather than stream:features
// because it is namespaced.
$response = $this->waitForServer('features');
$this->_logger->debug('Received: ' . $response);
}
// Set mechanisms based on that tag
$this->setMechanisms($response);
// If there was a starttls tag in there, and this connection has SSL
// enabled, then we should tell the server that we will start up tls as
// well.
if (preg_match("/<starttls xmlns=('|\")urn:ietf:params:xml:ns:xmpp-tls('|\")>(<required\\/>)?<\\/starttls>/", $response->asXML()) != 0 && $this->_ssl === true) {
$this->_logger->debug('Informing server we will start TLS');
$message = "<starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>";
$this->_stream->send($message);
// Wait to get the proceed message back from the server
$response = $this->waitForServer('proceed');
$this->_logger->debug('Received: ' . $response->asXML());
// Once we have the proceed signal from the server, we should turn
// on TLS on the stream and send the opening stream tag again.
$this->_stream->setTLS(true);
$this->_logger->debug('Enabled TLS');
// Now we need to start a new stream again.
$this->startStream();
// Server should now respond with start of stream and list of
// features
$response = $this->waitForServer('stream:stream');
$this->_logger->debug('Received: ' . $response);
// Set mechanisms based on that tag
$this->setMechanisms($response);
}
} catch (Stream_Exception $e) {
// A Stream Exception occured. Catch it and rethrow it as an Xmpp
// Exception.
throw new Xmpp_Exception('Failed to connect: ' . $e->getMessage());
}
return true;
}