Someone might find this useful. Plan to link to it from the wiki.
{-# LANGUAGE OverloadedStrings #-}
module HWProtoNEState where
import Control.Monad.Reader
import qualified Data.ByteString.Char8 as B
--------------------------------------
import CoreTypes
import Actions
import Utils
import RoomsAndClients
handleCmd_NotEntered :: CmdHandler
handleCmd_NotEntered ["NICK", newNick] = do
(ci, irnc) <- ask
let cl = irnc `client` ci
if not . B.null $ nick cl then return [ProtocolError "Nickname already chosen"]
else
if illegalName newNick then return [ByeClient "Illegal nickname"]
else
return $
ModifyClient (\c -> c{nick = newNick}) :
AnswerClients [sendChan cl] ["NICK", newNick] :
[CheckRegistered | clientProto cl /= 0]
handleCmd_NotEntered ["PROTO", protoNum] = do
(ci, irnc) <- ask
let cl = irnc `client` ci
if clientProto cl > 0 then return [ProtocolError "Protocol already known"]
else
if parsedProto == 0 then return [ProtocolError "Bad number"]
else
return $
ModifyClient (\c -> c{clientProto = parsedProto}) :
AnswerClients [sendChan cl] ["PROTO", showB parsedProto] :
[CheckRegistered | not . B.null $ nick cl]
where
parsedProto = readInt_ protoNum
handleCmd_NotEntered ["PASSWORD", passwd] = do
(ci, irnc) <- ask
let cl = irnc `client` ci
if passwd == webPassword cl then
return $ JoinLobby : [AnswerClients [sendChan cl] ["ADMIN_ACCESS"] | isAdministrator cl]
else
return [ByeClient "Authentication failed"]
handleCmd_NotEntered _ = return [ProtocolError "Incorrect command (state: not entered)"]