module Ketchup.Httpd
( HTTPRequest
, method, uri, httpver, headers
, statusMsg
, sendReply
, listenHTTP
, sendBadRequest
, sendNotFound
) where
import Control.Concurrent (forkIO)
import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as C
import qualified Data.Map as Map
import qualified Data.List as List
import Network
import qualified Network.Socket as NS
import Network.Socket.ByteString
import Ketchup.Utils
import System.IO
data HTTPRequest = HTTPRequest { method :: B.ByteString
, uri :: B.ByteString
, httpver :: B.ByteString
, headers :: Map.Map B.ByteString [B.ByteString]
} deriving (Show)
statusMsg :: Int -> B.ByteString
statusMsg stat
| stat == 200 = "200 OK"
| stat == 201 = "201 Created"
| stat == 204 = "204 No Content"
| stat == 400 = "400 Bad Request"
| stat == 403 = "403 Forbidden"
| stat == 404 = "404 Not Found"
| stat == 405 = "405 Method Not Allowed"
| stat == 410 = "410 Gone"
| stat == 500 = "500 Internal Server Error"
| stat == 501 = "501 Not Implemented"
| stat == 502 = "502 Bad Gateway"
| stat == 503 = "503 Service Unavailable"
| otherwise = "500 Internal Server Error"
sendBadRequest :: Socket -> IO ()
sendBadRequest client = do
sendReply client 400 [("Content-Type",["text/plain"])] "400 Bad Request!\n"
sendNotFound :: Socket -> IO ()
sendNotFound client = do
sendReply client 404 [("Content-Type",["text/plain"])] "404 Not Found!\n"
sendReply :: Socket -> Int -> [(B.ByteString, [B.ByteString])] -> B.ByteString -> IO ()
sendReply client status headers body = do
sendAll client reply
where
reply = B.concat ["HTTP/1.1 ", statusMsg status,"\r\n\
\Server: Ketchup\r\n\
\Content-Length: ", C.pack $ show $ C.length body, "\r\n\
\Connection: close\r\n",heads,"\r\n",body]
heads = B.concat $ map (\x -> B.concat [fst x, ": ", B.concat $ List.intersperse "," $ snd x, "\r\n"]) headers
parseRequestLine :: B.ByteString -> (B.ByteString, [B.ByteString])
parseRequestLine line =
(property, values)
where
property = head items
values = C.split ',' $ (trim . last) items
items = C.split ':' line
getRequest :: Socket -> IO [B.ByteString]
getRequest client = do
content <- recv client 1024
return $ C.lines content
parseRequest :: [B.ByteString] -> HTTPRequest
parseRequest reqlines =
HTTPRequest { method=met, uri=ur, httpver=ver, headers=heads }
where
[met, ur, ver] = (C.words . head) reqlines
heads = Map.fromList $ map parseRequestLine $ tail reqlines
handleRequest :: Socket -> (Socket -> HTTPRequest -> IO ()) -> IO ()
handleRequest client cback = do
reqlines <- getRequest client
case length reqlines of
0 -> sendBadRequest client
_ -> cback client $ parseRequest reqlines
sClose client
acceptAll :: Socket -> (Socket -> HTTPRequest -> IO ()) -> IO ()
acceptAll sock cback = do
(client, _) <- NS.accept sock
handleRequest client cback
acceptAll sock cback
createAcceptorPool :: Socket -> Int -> (Socket -> HTTPRequest -> IO ()) -> IO ()
createAcceptorPool sock max cback =
case max of
0 -> acceptAll sock cback
x -> do
forkIO $ acceptAll sock cback
createAcceptorPool sock (x1) cback
getHostaddr :: String -> IO NS.HostAddress
getHostaddr "*" = return NS.iNADDR_ANY
getHostaddr host = NS.inet_addr host
listenHTTP :: String -> PortNumber -> (Socket -> HTTPRequest -> IO ()) -> IO ()
listenHTTP hostname port cback = withSocketsDo $ do
host <- getHostaddr hostname
let addr = NS.SockAddrInet port host
sock <- NS.socket NS.AF_INET NS.Stream 0
NS.setSocketOption sock NS.ReuseAddr 1
NS.setSocketOption sock NS.NoDelay 1
NS.bindSocket sock addr
NS.listen sock 128
createAcceptorPool sock 128 cback
sClose sock