support bad USER/NICK order for Lite IRC, set realname as the nmdc description

--HG--
branch : nmdc-ircfrontend

COMPATIBILITY.txt

@@ -23,6 +23,7 @@ Unusable:
 		2016/05/07 22:57:04  <<< :Your nickname is already being used KILL  A
 		2016/05/07 22:57:04  >>> 'NICK' [pineapple420]
 		2016/05/07 22:57:04 Broken loop.
+	- some patches in place, needs retesting
 	Yaaic/Atomic
 	- doesn't properly understand/parse the room join
 	Atomic

server.go

@@ -306,6 +306,11 @@ func (s *Server) handleCommand(command string, args []string) {
 		if s.upstreamLauncher.Self.Nick == "" {
 			// allow set, as part of the login phase
 			s.upstreamLauncher.Self.Nick = args[0]
+
+		} else if args[0] == s.upstreamLauncher.Self.Nick {
+			// Ignore
+			// Required for compatibility with Lite IRC, which sends USER/NICK in the wrong order
+
 		} else {
 			s.reply(rplKill, "Can't change nicks on this server", "")
 			s.DisconnectClient()
@@ -322,9 +327,15 @@ func (s *Server) handleCommand(command string, args []string) {
 		}
 
 		if s.upstreamLauncher.Self.Nick == "" {
-			s.reply(rplKill, "Your nickname is already being used", "")
-			s.DisconnectClient()
-			return
+			// Whatever, treat it as a NICK call (non-strict client handshake) and take the username field to be the intended nick
+			// This will allow Lite IRC's bad handshake to log in (as long as the username and the nickname are the same)
+			s.upstreamLauncher.Self.Nick = args[0]
+		}
+
+		// Use the client's {real name} field as an NMDC {description}
+		if len(args) >= 4 && len(args[3]) > 0 && args[3][0] == ':' {
+			realName := strings.Join(args[3:], " ")[1:]
+			s.upstreamLauncher.Self.Description = realName
 		}
 
 		s.reply(rplWelcome)