netserver/HWProto.hs
author unc0rr
Thu, 01 May 2008 15:26:09 +0000
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'In room' state stub
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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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fromRoom :: String -> [ClientInfo] -> [ClientInfo]
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fromRoom roomName clients = filter (\cl -> roomName == room cl) clients
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-- 'noInfo' clients state command handlers
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handleCmd_noInfo :: ClientInfo -> [ClientInfo] -> [RoomInfo] -> [String] -> (ClientInfo, [RoomInfo], [ClientInfo], [String])
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handleCmd_noInfo client clients rooms ("NICK":newNick:[]) =
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	if not . null $ nick client then
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		(client, rooms, [client], ["ERROR", "The nick already chosen"])
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	else if haveSameNick then
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		(client, rooms, [client], ["WARNING", "Choose another nick"])
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	else
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		(client{nick = newNick}, rooms, [client], ["NICK", 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 clients rooms ("PROTO":protoNum:[]) =
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	if protocol client > 0 then
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		(client, rooms, [client], ["ERROR", "Protocol number already known"])
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	else if parsedProto == 0 then
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		(client, rooms, [client], ["ERROR", "Bad input"])
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	else
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		(client{protocol = parsedProto}, rooms, [], [])
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	where
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		parsedProto = fromMaybe 0 (maybeRead protoNum :: Maybe Word16)
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handleCmd_noInfo client _ rooms _ = (client, rooms, [client], ["ERROR", "Bad command or incorrect parameter"])
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-- 'noRoom' clients state command handlers
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handleCmd_noRoom :: ClientInfo -> [ClientInfo] -> [RoomInfo] -> [String] -> (ClientInfo, [RoomInfo], [ClientInfo], [String])
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handleCmd_noRoom client clients rooms ("CREATE":newRoom:roomPassword:[]) =
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	if haveSameRoom then
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		(client, rooms, [client], ["WARNING", "There's already a room with that name"])
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	else
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		(client{room = newRoom, isMaster = True}, (RoomInfo newRoom roomPassword):rooms, [client], ["JOIN", newRoom, 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 noRoom then
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		(client, rooms, [client], ["WARNING", "There's no room with that name"])
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	else if roomPassword /= password (getRoom roomName) then
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		(client, rooms, [client], ["WARNING", "Wrong password"])
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	else
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		(client{room = roomName}, rooms, client : fromRoom roomName clients, ["JOIN", roomName, nick client])
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	where
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		noRoom = null $ filter (\room -> roomName == name room) rooms
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		getRoom roomName = fromJust $ find (\room -> roomName == name room) rooms
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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 client _ rooms _ = (client, rooms, [client], ["ERROR", "Bad command or incorrect parameter"])
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-- 'inRoom' clients state command handlers
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handleCmd_inRoom :: ClientInfo -> [ClientInfo] -> [RoomInfo] -> [String] -> (ClientInfo, [RoomInfo], [ClientInfo], [String])
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handleCmd_inRoom client _ rooms _ = (client, rooms, [client], ["ERROR", "Bad command or incorrect parameter"])
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-- state-independent comman handlers	
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handleCmd :: ClientInfo -> [ClientInfo] -> [RoomInfo] -> [String] -> (ClientInfo, [RoomInfo], [ClientInfo], [String])
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handleCmd client clients rooms ("QUIT":xs) =
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	if null (room client) then
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		(client, rooms, [client], ["QUIT"])
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	else
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		(client, rooms, fromRoom (room client) clients, ["QUIT", 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