netserver/HWProto.hs
author unc0rr
Mon, 06 Oct 2008 18:40:47 +0000
changeset 1309 1a38a967bd48
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child 1317 13cf8c5a7428
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Fix a bug with 'ghosts' on server
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module HWProto where
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import IO
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import Data.List
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import Data.Word
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import Miscutils
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import Maybe (fromMaybe, fromJust)
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answerBadCmd = [(clientOnly, ["ERROR", "Bad command, state or incorrect parameter"])]
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answerQuit = [(clientOnly, ["off"])]
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answerAbandoned = [(sameRoom, ["BYE"])]
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answerQuitInform nick = [(othersInRoom, ["LEFT", nick])]
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answerNickChosen = [(clientOnly, ["ERROR", "The nick already chosen"])]
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answerNickChooseAnother = [(clientOnly, ["WARNING", "Choose another nick"])]
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answerNick nick = [(clientOnly, ["NICK", nick])]
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answerProtocolKnown = [(clientOnly, ["ERROR", "Protocol number already known"])]
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answerBadInput = [(clientOnly, ["ERROR", "Bad input"])]
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answerProto protoNum = [(clientOnly, ["PROTO", show protoNum])]
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answerRoomsList list = [(clientOnly, ["ROOMS"] ++ list)]
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answerRoomExists = [(clientOnly, ["WARNING", "There's already a room with that name"])]
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answerJoined nick = [(sameRoom, ["JOINED", nick])]
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answerNoRoom = [(clientOnly, ["WARNING", "There's no room with that name"])]
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answerWrongPassword = [(clientOnly, ["WARNING", "Wrong password"])]
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answerChatString nick msg = [(othersInRoom, ["CHAT_STRING", nick, msg])]
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-- Main state-independent cmd handler
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handleCmd :: CmdHandler
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handleCmd client _ rooms ("QUIT":xs) =
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	if null (room client) then
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		(noChangeClients, noChangeRooms, answerQuit)
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	else if isMaster client then
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		(noChangeClients, removeRoom (room client), answerAbandoned) -- core disconnects clients on ROOMABANDONED answer
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	else
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		(noChangeClients, noChangeRooms, answerQuit ++ (answerQuitInform $ nick client))
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-- check state and call state-dependent commmand handlers
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handleCmd client clients rooms cmd =
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	if null (nick client) || protocol client == 0 then
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		handleCmd_noInfo client clients rooms cmd
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	else if null (room client) then
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		handleCmd_noRoom client clients rooms cmd
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	else
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		handleCmd_inRoom client clients rooms cmd
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-- 'no info' state - need to get protocol number and nickname
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handleCmd_noInfo :: CmdHandler
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handleCmd_noInfo client clients _ ["NICK", newNick] =
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	if not . null $ nick client then
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		(noChangeClients, noChangeRooms, answerNickChosen)
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	else if haveSameNick then
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		(noChangeClients, noChangeRooms, answerNickChooseAnother)
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	else
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		(modifyClient client{nick = newNick}, noChangeRooms, answerNick newNick)
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	where
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		haveSameNick = not . null $ filter (\cl -> newNick == nick cl) clients
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handleCmd_noInfo client _ _ ["PROTO", protoNum] =
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	if protocol client > 0 then
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		(noChangeClients, noChangeRooms, answerProtocolKnown)
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	else if parsedProto == 0 then
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		(noChangeClients, noChangeRooms, answerBadInput)
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	else
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		(modifyClient client{protocol = parsedProto}, noChangeRooms, answerProto parsedProto)
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	where
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		parsedProto = fromMaybe 0 (maybeRead protoNum :: Maybe Word16)
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handleCmd_noInfo _ _ _ _ = (noChangeClients, noChangeRooms, answerBadCmd)
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-- 'noRoom' clients state command handlers
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handleCmd_noRoom :: CmdHandler
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handleCmd_noRoom client _ rooms ["LIST"] =
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		(noChangeClients, noChangeRooms, answerRoomsList $ map name rooms)
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handleCmd_noRoom client _ rooms ["CREATE", newRoom, roomPassword] =
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	if haveSameRoom then
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		(noChangeClients, noChangeRooms, answerRoomExists)
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	else
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		(modifyClient client{room = newRoom, isMaster = True}, addRoom (RoomInfo newRoom roomPassword []), answerJoined $ nick client)
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	where
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		haveSameRoom = not . null $ filter (\room -> newRoom == name room) rooms
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handleCmd_noRoom client clients rooms ["CREATE", newRoom] =
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	handleCmd_noRoom client clients rooms ["CREATE", newRoom, ""]
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handleCmd_noRoom client clients rooms ["JOIN", roomName, roomPassword] =
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	if noSuchRoom then
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		(noChangeClients, noChangeRooms, answerNoRoom)
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	else if roomPassword /= password (roomByName roomName rooms) then
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		(noChangeClients, noChangeRooms, answerWrongPassword)
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	else
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		(modifyClient client{room = roomName}, noChangeRooms, (answerJoined $ nick client) ++ answerNicks)
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	where
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		noSuchRoom = null $ filter (\room -> roomName == name room) rooms
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		answerNicks = [(clientOnly, ["JOINED"] ++ (map nick $ filter (\ci -> room ci == roomName) clients))]
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handleCmd_noRoom client clients rooms ["JOIN", roomName] =
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	handleCmd_noRoom client clients rooms ["JOIN", roomName, ""]
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handleCmd_noRoom _ _ _ _ = (noChangeClients, noChangeRooms, answerBadCmd)
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-- 'inRoom' clients state command handlers
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handleCmd_inRoom :: CmdHandler
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handleCmd_inRoom client _ _ ["CHAT_STRING", _, msg] = (noChangeClients, noChangeRooms, answerChatString (nick client) msg)
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handleCmd_inRoom _ _ _ _ = (noChangeClients, noChangeRooms, answerBadCmd)