swap WHO for NAMES, ignore CAP requests, read NOTICEs, option to toggle autojoin, cosmetic fixes for hexchat

--HG--
branch : nmdc-ircfrontend

TODO.txt

@@ -2,16 +2,26 @@
 PRE-RELEASE
 ===========
 
-- nick list
+- hexchat: missing nick list
 
-- part all nicks on server disconnection
+- Atomic: fix crash on connection (even with autojoin disabled)
+
+- yaaic: doesn't recognise the room join (even with autojoin disabled)
+
+- andchat: WHO spam
+
+- part all nicks upon upstream server disconnection
 
 - test the current password auth
 
 
+
+
 WISHLIST
 ========
 
+- send client keepalives (PING) /and/ ensure we get a reply (PONG)
+
 - client version sync (CTCP VERSION)
 
 - client descriptions (CTCP USERINFO)
@@ -34,6 +44,8 @@ WISHLIST
 
 - threadsafe access to libnmdc hub options
 
+- do we need to send the same payload in our PONG response?
+
 
 
 

main.go

@@ -31,9 +31,13 @@ func main() {
 	dcAddress := flag.String("upstream", "127.0.0.1:411", "Upstream NMDC server")
 	serverName := flag.String("servername", "nmdc-ircfrontend", "Server name displayed to clients")
 	verbose := flag.Bool("verbose", false, "Display debugging information")
+	autojoin := flag.Bool("autojoin", true, "Automatically join clients to the channel")
 	flag.Parse()
 
 	log.Printf("Listening on '%s'...", *ircAddress)
+	if *autojoin {
+		log.Printf("Clients will be automatically joined to the channel.")
+	}
 
 	listener, err := net.Listen("tcp", *ircAddress)
 	if err != nil {
@@ -51,6 +55,7 @@ func main() {
 		// Spin up a worker for the new user.
 		server := NewServer(*serverName, libnmdc.HubAddress(*dcAddress), conn)
 		server.verbose = *verbose
+		server.autojoin = *autojoin
 		go server.RunWorker()
 	}
 }

server.go

@@ -29,18 +29,27 @@ import (
 	"time"
 )
 
+type ClientState int
+
+const (
+	CSUnregistered ClientState = iota
+	CSRegistered
+	CSJoined
+)
+
 type Server struct {
 	name string
 	motd string
 
 	clientConn  net.Conn
-	clientRegistered bool
+	clientState ClientState
 
 	upstreamLauncher libnmdc.HubConnectionOptions
 	upstreamCloser   chan struct{}
 	upstream         *libnmdc.HubConnection
 
 	verbose  bool
+	autojoin bool
 
 	lastMessage string // FIXME racey
 }
@@ -52,7 +61,8 @@ func NewServer(name string, upstream libnmdc.HubAddress, conn net.Conn) *Server
 	return &Server{
 		name:        name,
 		clientConn:  conn,
-		motd:       "Connected to " + name,
+		clientState: CSUnregistered,
+		motd:        "Connected to " + name + ". You /must/ join " + BLESSED_CHANNEL + " to continue.",
 		upstreamLauncher: libnmdc.HubConnectionOptions{
 			Address: upstream,
 			Self:    *self,
@@ -120,13 +130,12 @@ func (s *Server) RunWorker() {
 	s.verboseln("Broken loop.")
 
 	// Cleanup upstream
-	if s.clientRegistered {
+	if s.upstream != nil {
 		s.upstreamCloser <- struct{}{} // always safe to do this /once/
 	}
 
 	// Clean up ourselves
 	s.DisconnectClient() // if not already done
-	s.clientRegistered = false
 }
 
 func (s *Server) upstreamWorker() {
@@ -158,7 +167,7 @@ func (s *Server) upstreamWorker() {
 				s.sendChannelTopic(hubEvent.Nick)
 
 			case libnmdc.EVENT_PRIVATE:
-				s.reply(rplMsg, s.upstreamLauncher.Self.Nick, hubEvent.Nick, hubEvent.Message)
+				s.reply(rplMsg, hubEvent.Nick, s.upstreamLauncher.Self.Nick, hubEvent.Message)
 
 			case libnmdc.EVENT_PUBLIC:
 				if hubEvent.Nick == s.upstreamLauncher.Self.Nick && hubEvent.Message == s.lastMessage {
@@ -168,6 +177,7 @@ func (s *Server) upstreamWorker() {
 				}
 
 			case libnmdc.EVENT_SYSTEM_MESSAGE_FROM_CONN, libnmdc.EVENT_SYSTEM_MESSAGE_FROM_HUB:
+				// FIXME blank names work well in hexchat, but not in yaaic
 				s.reply(rplMsg, "", BLESSED_CHANNEL, hubEvent.Message)
 
 			}
@@ -183,12 +193,33 @@ func (s *Server) handleCommand(command string, args []string) {
 	case "PING":
 		s.reply(rplPong)
 
+	case "PONG":
+		// do nothing
+
 	case "INFO":
 		s.reply(rplInfo, APP_DESCRIPTION)
 
 	case "VERSION":
 		s.reply(rplVersion, VERSION)
 
+	case "MOTD":
+		s.sendMOTD(s.motd)
+
+	case "CAP":
+		return
+		/*
+			if len(args) < 1 {
+				s.reply(errMoreArgs)
+				return
+			}
+
+			if args[0] == "LS" {
+				s.writeClient("CAP * LS :nmdc-ircfrontend") // no special IRCv3 capabilities available
+			} else {
+				s.writeClient(fmt.Sprintf(":%s 410 * %s :Invalid CAP command", s.name, args[0]))
+			}
+		*/
+
 	case "PASS":
 		// RFC2812 registration. Stash the password for later
 		if len(args) < 1 {
@@ -215,7 +246,7 @@ func (s *Server) handleCommand(command string, args []string) {
 		// This command sets altname, realname, ... none of which we use
 		// It's the final step in a PASS/NICK/USER login handshake.
 
-		if s.clientRegistered == true {
+		if s.clientState != CSUnregistered {
 			s.reply(rplKill, "You're already registered.", "")
 			s.DisconnectClient()
 			return
@@ -228,18 +259,12 @@ func (s *Server) handleCommand(command string, args []string) {
 		}
 
 		s.reply(rplWelcome)
-		s.clientRegistered = true
+		s.clientState = CSRegistered
 
-		// Tell the user that they themselves joined the chat channel
+		// TODO tell the client that they /must/ join #chat
-		s.reply(rplJoin, s.upstreamLauncher.Self.Nick, BLESSED_CHANNEL)
+		if s.autojoin {
-
+			s.handleCommand("JOIN", []string{BLESSED_CHANNEL})
-		// Send (initially just us) nicklist for the chat channel
+		}
-		s.reply(rplNames, BLESSED_CHANNEL, s.upstreamLauncher.Self.Nick)
-		s.reply(rplEndOfNames, BLESSED_CHANNEL)
-
-		// Spawn upstream connection
-		s.upstream = s.upstreamLauncher.Connect()
-		go s.upstreamWorker()
 
 		// Send a CTCP VERSION request to the client. If the IRC client can
 		//   supply a client version string, we can replace our tag with it,
@@ -252,7 +277,7 @@ func (s *Server) handleCommand(command string, args []string) {
 
 func (s *Server) handleRegisteredCommand(command string, args []string) {
 
-	if s.clientRegistered == false {
+	if s.clientState == CSUnregistered {
 		s.reply(errNotReg)
 		return
 	}
@@ -266,9 +291,30 @@ func (s *Server) handleRegisteredCommand(command string, args []string) {
 
 		switch args[0] {
 		case BLESSED_CHANNEL:
-			// Ignore, but they're already there
+			if s.clientState != CSJoined {
+				// Join for the first time
+				s.clientState = CSJoined
+
+				// Acknowledge
+				s.reply(rplJoin, s.upstreamLauncher.Self.Nick, BLESSED_CHANNEL)
+
+				// Send (initially just us) nicklist for the chat channel
+				s.sendNames()
+
+				// Spawn upstream connection
+				s.upstream = s.upstreamLauncher.Connect()
+				go s.upstreamWorker()
+
+			} else {
+				// They're already here, ignore
+				// Can happen if autojoin is enabled but the client already requested a login
+			}
+
 		case "0":
-			// Ignore, Intend to quit all channels but we don't allow that
+			// Quitting all channels? Drop client
+			s.reply(rplKill, "Bye.", "")
+			s.DisconnectClient()
+
 		default:
 			s.reply(rplKill, "There is only '"+BLESSED_CHANNEL+"'.", "")
 			s.DisconnectClient()
@@ -283,9 +329,10 @@ func (s *Server) handleRegisteredCommand(command string, args []string) {
 		if args[0] == BLESSED_CHANNEL {
 			// You can check out any time you like, but you can never leave
 			s.reply(rplJoin, s.upstreamLauncher.Self.Nick, BLESSED_CHANNEL)
+			s.sendNames()
 		}
 
-	case "PRIVMSG":
+	case "PRIVMSG", "NOTICE":
 		if len(args) < 2 {
 			s.reply(errMoreArgs)
 			return
@@ -357,6 +404,10 @@ func (s *Server) handleRegisteredCommand(command string, args []string) {
 			return
 		}
 
+		// Ignore what we're "supposed" to do
+		s.sendNames()
+
+		/*
 			if args[0] == BLESSED_CHANNEL {
 				// always include ourselves
 				s.reply(rplWho, s.upstreamLauncher.Self.Nick, args[0])
@@ -375,6 +426,7 @@ func (s *Server) handleRegisteredCommand(command string, args []string) {
 				}
 			}
 			s.reply(rplEndOfWho, args[0])
+		*/
 
 	case "MODE":
 		if len(args) < 1 {
@@ -407,10 +459,23 @@ func (s *Server) DisconnectClient() {
 		s.clientConn.Close()
 	}
 	s.clientConn = nil
+	s.clientState = CSUnregistered
 
 	// Readloop will stop, which kills the upstream connection too
 }
 
+func (s *Server) sendNames() {
+	names := s.upstreamLauncher.Self.Nick
+	if s.upstream != nil {
+		for nick, _ := range s.upstream.Users {
+			names += " " + nick
+		}
+	}
+
+	s.reply(rplNames, BLESSED_CHANNEL, names)
+	s.reply(rplEndOfNames, BLESSED_CHANNEL)
+}
+
 func (s *Server) sendChannelTopic(topic string) {
 	if len(topic) > 0 {
 		s.reply(rplTopic, BLESSED_CHANNEL, s.upstream.HubName)
@@ -485,7 +550,7 @@ func (s *Server) reply(code replyCode, args ...string) {
 	case rplMOTD:
 		s.writeClient(fmt.Sprintf(":%s 372 %s :- %s", s.name, s.upstreamLauncher.Self.Nick, args[0]))
 	case rplEndOfMOTD:
-		s.writeClient(fmt.Sprintf(":%s 376 %s :End of MOTD Command", s.name, s.upstreamLauncher.Self.Nick))
+		s.writeClient(fmt.Sprintf(":%s 376 %s :- End of MOTD", s.name, s.upstreamLauncher.Self.Nick))
 	case rplPong:
 		s.writeClient(fmt.Sprintf(":%s PONG %s %s", s.name, s.upstreamLauncher.Self.Nick, s.name))
 	case errMoreArgs:
@@ -503,7 +568,7 @@ func (s *Server) reply(code replyCode, args ...string) {
 	case errUnknownCommand:
 		s.writeClient(fmt.Sprintf(":%s 421 %s %s :Unknown command", s.name, s.upstreamLauncher.Self.Nick, args[0]))
 	case errNotReg:
-		s.writeClient(fmt.Sprintf(":%s 451 :You have not registered", s.name))
+		s.writeClient(fmt.Sprintf(":%s 451 :- You have not registered", s.name))
 	case errPassword:
 		s.writeClient(fmt.Sprintf(":%s 464 %s :Error, password incorrect", s.name, s.upstreamLauncher.Self.Nick))
 	case errNoPriv: