path: root/miaowe.hs

{-# LANGUAGE CPP #-}

-- IRC art (spam)bot

{-
   Copyright 2023 "Laura Aléanor"

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
-}

import Data.Bits
import Data.Bool
import qualified Data.ByteString as S
import qualified Data.ByteString.Char8 as S.Char8
import qualified Data.ByteString.Internal as S.Internal
import Data.Char
import Data.List
import Data.Time
import Data.Word
import System.Directory
import System.Environment
import System.Exit
import System.IO
import Text.Printf

#ifdef FORTUNE
import System.Process
#endif

type BitMap = [Word8]
type MircString = String

type PpmBmp = [Word8]

type IrcChannel = String

data Image = Image {
  imgBmp :: BitMap,
  imgPitch :: Int,
  imgHeight :: Int
  }

data UserInfo = UserInfo {
  userNick :: String,
  userName :: String,
  userRealname :: String,
  userCredentials :: String
  }

codeUrl = "https://git.vampires.gay/miaowe.git"

#ifdef FORTUNE
helpString = "Commands available: Code; Fortune; Help; List. \
Anything else is interpreted as a file name."
#else
helpString = "Commands available: Code; Help; List. \
Anything else is interpreted as a file name."
#endif

-- Minimum time between spammy commands.
minimumDelay = 30

ctrlC = [toEnum 03] :: String
ctrlO = [toEnum 15] :: String
ctrlV = [toEnum 22] :: String

-- https://www.mirc.com/colors.html
w24ToMirc :: BitMap -> MircString
w24ToMirc word
  -- White
  | (word!!0 > 210) && (word!!1 > 210) && (word!!2 > 210)
  = "0"
  -- Black
  | (word!!0 == 0) && (word!!1 == 0) && (word!!2 == 0)
  = "1"
  -- Light red
  | (word!!0 > 127) && (word!!1 == 0) && (word!!2 == 0)
  = "4"
  -- Light green
  | (word!!0 == 0) && (word!!1 > 147) && (word!!2 == 0)
  = "9"
  -- Light blue
  | (word!!0 == 0) && (word!!1 == 0) && (word!!2 > 127)
  = "12"
  -- Red (aka brown)
  | (word!!0 <= 127) && (word!!1 == 0) && (word!!2 == 0)
  = "5"
  -- Green
  | (word!!0 == 0) && (word!!1 <= 147) && (word!!2 == 0)
  = "3"
  -- Blue
  | (word!!0 == 0) && (word!!1 == 0) && (word!!2 <= 127)
  = "2"
  -- Yellow
  | (word!!0 > 252) && (word!!1 > 127) && (word!!2 == 0)
  = "8"
  -- Orange
  | (word!!0 <= 252) && (word!!1 <= 127) && (word!!2 == 0)
  = "7"
  -- Pink
  | (word!!0 > 156) && (word!!1 == 0) && (word!!2 > 156)
  = "13"
  -- Purple
  | (word!!0 <= 156) && (word!!1 == 0) && (word!!2 <= 156)
  = "6"
  -- Light cyan
  | (word!!0 == 0) && (word!!1 > 147) && (word!!2 > 147)
  = "11"
  -- Cyan
  | (word!!0 == 0) && (word!!1 <= 147) && (word!!2 <= 147)
  = "10"
  -- Light grey
  | (word!!0 > 127) && (word!!1 > 127) && (word!!2 > 127)
  = "15"
  -- Grey
  | otherwise = "14"

lineToMirc :: BitMap -> MircString
lineToMirc [] = []
lineToMirc line = ctrlC ++ w24ToMirc (take 3 line) ++ ctrlV ++ "  " ++ ctrlO
                  ++ lineToMirc (drop 3 line)

bmpToMirc :: Int -> Int -> BitMap -> MircString
bmpToMirc _ 0 _ = []
bmpToMirc pitch height bmp =lineToMirc (take pitch bmp) ++ "\n"
                             ++ bmpToMirc pitch (height-1) (drop pitch bmp)

w8Split :: Word8 -> [Word8] -> [[Word8]]
w8Split c = map S.unpack . S.split c . S.pack

w8ToString :: [Word8] -> String
w8ToString = S.Char8.unpack . S.pack

ppmToImage :: PpmBmp -> Image
ppmToImage ppm = Image
                 (intercalate [S.Internal.c2w '\n'] $ drop 3
                                (w8Split (S.Internal.c2w '\n') ppm))
                 ((read (w8ToString
                   ((w8Split (S.Internal.c2w ' ') ((w8Split
                                    (S.Internal.c2w '\n') ppm) !! 1)) !! 0)))*3)
                 (read ( w8ToString
                   ((w8Split (S.Internal.c2w ' ') ((w8Split
                                   (S.Internal.c2w '\n') ppm) !! 1)) !! 1)))

readFromConf :: String -> String -> String
readFromConf conf key = (intercalate " " .
                         drop 1 .
                         words .
                         (!!0) .
                         filter (\l -> (words l)!!0 == key))
                        (lines conf)

readConf :: String -> UserInfo
readConf conf = UserInfo
                (readFromConf conf "nick")
                (readFromConf conf "username")
                (readFromConf conf "realname")
                (readFromConf conf "credentials")

ircConnect :: UserInfo -> MircString
ircConnect u = printf "NICK %s\r\n\
USER %s 0 * :%s\r\n\
PRIVMSG NickServ :IDENTIFY %s\r\n"
               (userNick u)
               (userName u)
               (userRealname u)
               (userCredentials u)

waitForMessage :: (String -> Bool) -> IO String
waitForMessage p = getLine >>= \l -> if p l
                                     then return l
                                     else
                                       (if (words l)!!0 == "PING"
                                       then
                                          putStr
                                          ("PONG " ++ ((words l)!!1) ++ "\r\n")
                                          >> hFlush stdout
                                       else return ())
                                       >> waitForMessage p

waitForCloak :: IO String
waitForCloak = waitForMessage (\l -> (words l)!!1 == "396")

waitForCommand :: IO String
waitForCommand = waitForMessage (\l -> if ((length (words l)) >= 4)
                                       then init ((words l)!!3) == ":miaowe"
                                            && elem (last ((words l)!!3)) ":,"
                                       else False)

joinChannel :: String -> IO ()
joinChannel c = putStr (printf "JOIN %s\r\n" c)

sendToChannel :: IrcChannel -> MircString -> IO ()
sendToChannel c s = (putStr $ concat $ map (\l -> printf "PRIVMSG %s :%s\r\n" c l)
                    (lines s)) >> hFlush stdout

sendFile :: IrcChannel -> FilePath -> IO ()
sendFile channel path = S.readFile path
                        >>= sendToChannel channel .
                        (\img ->bmpToMirc
                                (imgPitch img)
                                (imgHeight img)
                                (imgBmp img)) .
                        ppmToImage .
                        S.unpack .
                        S.Char8.pack .
                        intercalate "\n" .
                        filter (\l->not (head l == '#')) .
                        lines .
                        S.Char8.unpack

trySendFile :: IrcChannel -> FilePath -> IO Bool
trySendFile channel path = (doesFileExist (path)
                            >>= (\b ->
                                    if b
                                    then
                                      sendFile channel (path)
                                      >> return True
                                    else
                                      sendToChannel channel
                                      "No such file or command."
                                    >> hFlush stdout
                                    >> return False))

#ifdef FORTUNE
getFortune :: IO String
getFortune = readCreateProcess ((shell "fortune -e | cowsay -b")) ""
#endif

-- Takes a channel and command, return True if
-- command should count towards rate limiting,
-- False if not.
doCommand :: IrcChannel -> MircString -> IO Bool
doCommand channel command =
  case map toLower ((words command)!!4) of
    "list" -> listDirectory "."
              >>= sendToChannel channel . intercalate "\n"
              >> return True
    "code" -> sendToChannel channel codeUrl
              >> return False
    "help" -> sendToChannel channel helpString
              >> return False
#ifdef FORTUNE
    "fortune" -> getFortune
                 >>= sendToChannel channel
                 >> return True
#endif
    _ -> (if isInfixOf "/" ((words command)!!4)
          then
            sendToChannel channel "Only PWD please."
           >> return False
          else
            trySendFile channel ((words command)!!4))

-- Subtracts t from the current time to get the time t ago.
subtractPresent :: NominalDiffTime -> IO UTCTime
subtractPresent t = getCurrentTime >>= \c -> return $ addUTCTime (-t) c

-- Takes channel, command, and time elapsed since last command.
-- Returns the time to use for counting, either the current time,
-- or the one of the previous command it throttling is not wished.
processCommand :: IrcChannel -> MircString -> NominalDiffTime -> IO UTCTime
processCommand channel command timeElapsed
  | timeElapsed < minimumDelay =
      sendToChannel channel "Not so quick, partner"
      >> subtractPresent timeElapsed
  | length (words command) < 5 =
      sendToChannel channel "You need to specify \
a command."
      >> subtractPresent timeElapsed
  | otherwise =
      doCommand channel command
      >>= bool (subtractPresent timeElapsed) getCurrentTime

commandChannel :: String -> String
commandChannel command = (words command)!!2

mainLoop :: IrcChannel -> UTCTime -> IO ()
mainLoop channel time = waitForCommand
                        >>= \line ->
                              (if commandChannel line == channel
                               then getCurrentTime
                                    >>= \t -> processCommand channel line
                                              (diffUTCTime t time)
                               else return time)
                              >>= mainLoop channel


main :: IO ()
main =
  openFile "../conf" ReadMode
  >>= (\handle ->
        hGetContents handle
        >>= putStr . ircConnect . readConf
        >> hClose handle)
  >> hFlush stdout
  >> waitForCloak
  >> hFlush stdout
  >> getArgs
  >>= \args ->
        joinChannel (args!!0)
        >> hFlush stdout
        >> getCurrentTime
        >>= \t -> mainLoop (args!!0) (addUTCTime (-minimumDelay) t)