Add two delegates for TLS upgrades.

This way, an OFStreamObserver can be used even with TLS.

src/XMPPConnection.h

@@ -58,6 +58,8 @@
 -  (void)connection: (XMPPConnection*)conn
   didReceiveMessage: (XMPPMessage*)msg;
 - (void)connectionWasClosed: (XMPPConnection*)conn;
+- (void)connectionWillUpgradeToTLS: (XMPPConnection*)conn;
+- (void)connectionDidUpgradeToTLS: (XMPPConnection*)conn;
 @end
 
 /**

src/XMPPConnection.m

@@ -346,11 +346,20 @@
 	if ([[elem namespace] isEqual: XMPP_NS_STARTTLS]) {
 		if ([[elem name] isEqual: @"proceed"]) {
 			/* FIXME: Catch errors here */
-			SSLSocket *newSock = [[SSLSocket alloc]
-			    initWithSocket: sock];
+			SSLSocket *newSock;
+
+			if ([delegate respondsToSelector:
+			    @selector(connectionWillUpgradeToTLS:)])
+				[delegate connectionWillUpgradeToTLS: self];
+
+			newSock = [[SSLSocket alloc] initWithSocket: sock];
 			[sock release];
 			sock = newSock;
 
+			if ([delegate respondsToSelector:
+			    @selector(connectionDidUpgradeToTLS:)])
+				[delegate connectionDidUpgradeToTLS: self];
+
 			/* Stream restart */
 			[parser setDelegate: self];
 			[self XMPP_startStream];
@@ -754,4 +763,12 @@
 - (void)connectionWasClosed: (XMPPConnection*)conn
 {
 }
+
+- (void)connectionWillUpgradeToTLS: (XMPPConnection*)conn
+{
+}
+
+- (void)connectionDidUpgradeToTLS: (XMPPConnection*)conn
+{
+}
 @end