{-# LANGUAGE BangPatterns #-} {-# LANGUAGE CPP #-} {-# LANGUAGE DeriveDataTypeable #-} {-# LANGUAGE OverloadedStrings #-} {-# LANGUAGE Rank2Types #-} {-# LANGUAGE ScopedTypeVariables #-} module Snap.Internal.Http.Server where ------------------------------------------------------------------------------ import Blaze.ByteString.Builder import Blaze.ByteString.Builder.Char8 import Blaze.ByteString.Builder.Enumerator import Blaze.ByteString.Builder.HTTP import Control.Arrow (first, second) import Control.Monad.CatchIO hiding ( bracket , catches , finally , Handler ) import qualified Control.Monad.CatchIO as CatchIO import Control.Monad.State.Strict import Control.Exception hiding (catch, throw) import Data.Char import qualified Data.CaseInsensitive as CI import Data.ByteString (ByteString) import qualified Data.ByteString as S import qualified Data.ByteString.Char8 as SC import qualified Data.ByteString.Lazy as L import Data.ByteString.Internal (c2w, w2c) import Data.Enumerator.Internal import Data.Int import Data.IORef import Data.List (foldl') import qualified Data.Map as Map import Data.Maybe ( catMaybes, fromJust, fromMaybe, isJust , isNothing ) import Data.Monoid import qualified Data.Text as T import qualified Data.Text.Encoding as T import Data.Time import Data.Typeable import Data.Version import GHC.Conc import Network.Socket (withSocketsDo, Socket) #if !MIN_VERSION_base(4,6,0) import Prelude hiding (catch) #endif import System.IO import System.Locale ------------------------------------------------------------------------------ import System.FastLogger (timestampedLogEntry, combinedLogEntry) import Snap.Internal.Http.Types import Snap.Internal.Debug import Snap.Internal.Exceptions (EscapeHttpException (..)) import Snap.Internal.Http.Parser import Snap.Internal.Http.Server.Date import Snap.Internal.Http.Server.Backend import Snap.Internal.Http.Server.HttpPort import qualified Snap.Internal.Http.Server.TLS as TLS import Snap.Internal.Http.Server.SimpleBackend import Snap.Internal.Iteratee.Debug import Snap.Internal.Parsing (unsafeFromInt) import Snap.Iteratee hiding (head, take, map) import qualified Snap.Iteratee as I import Snap.Types.Headers (Headers) import qualified Snap.Types.Headers as H import qualified Paths_snap_server as V ------------------------------------------------------------------------------ -- | The handler has to return the request object because we have to clear the -- HTTP request body before we send the response. If the handler consumes the -- request body, it is responsible for setting @rqBody=return@ in the returned -- request (otherwise we will mess up reading the input stream). -- -- Note that we won't be bothering end users with this -- the details will be -- hidden inside the Snap monad type ServerHandler = (ByteString -> IO ()) -> ((Int -> Int) -> IO ()) -> Request -> Iteratee ByteString IO (Request,Response) ------------------------------------------------------------------------------ type ServerMonad = StateT ServerState (Iteratee ByteString IO) ------------------------------------------------------------------------------ data ListenPort = -- (bind address, port) HttpPort ByteString Int | -- (bind address, port, path to certificate, path to key) HttpsPort ByteString Int FilePath FilePath ------------------------------------------------------------------------------ instance Show ListenPort where show (HttpPort b p ) = concat [ "http://" , SC.unpack b, ":", show p, "/" ] show (HttpsPort b p _ _) = concat [ "https://", SC.unpack b, ":", show p, "/" ] ------------------------------------------------------------------------------ -- This exception will be thrown if we decided to terminate the request before -- running the user handler. data TerminatedBeforeHandlerException = TerminatedBeforeHandlerException deriving (Show, Typeable) instance Exception TerminatedBeforeHandlerException -- We throw this if we get an exception that escaped from the user handler. data ExceptionAlreadyCaught = ExceptionAlreadyCaught deriving (Show, Typeable) instance Exception ExceptionAlreadyCaught ------------------------------------------------------------------------------ data ServerState = ServerState { _forceConnectionClose :: Bool , _localHostname :: ByteString , _sessionPort :: SessionInfo , _logAccess :: Request -> Response -> IO () , _logError :: ByteString -> IO () } ------------------------------------------------------------------------------ runServerMonad :: ByteString -- ^ local host name -> SessionInfo -- ^ session port information -> (Request -> Response -> IO ()) -- ^ access log function -> (ByteString -> IO ()) -- ^ error log function -> ServerMonad a -- ^ monadic action to run -> Iteratee ByteString IO a runServerMonad lh s la le m = evalStateT m st where st = ServerState False lh s la le ------------------------------------------------------------------------------ -- input/output ------------------------------------------------------------------------------ httpServe :: Int -- ^ default timeout -> [ListenPort] -- ^ ports to listen on -> ByteString -- ^ local hostname (server name) -> Maybe (ByteString -> IO ()) -- ^ access log action -> Maybe (ByteString -> IO ()) -- ^ error log action -> ([Socket] -> IO ()) -- ^ initialisation -> ServerHandler -- ^ handler procedure -> IO () httpServe defaultTimeout ports localHostname alog' elog' initial handler = withSocketsDo $ spawnAll alog' elog' `catches` errorHandlers where -------------------------------------------------------------------------- errorHandlers = [ Handler sslException , Handler threadWasKilled , Handler otherException ] -------------------------------------------------------------------------- sslException (e :: TLS.TLSException) = do let msg = SC.concat [ "This version of snap-server was not built with SSL " , "support.\n" , "Please compile snap-server with -fopenssl to enable it." ] logE elog' msg SC.hPutStrLn stderr msg throw e ------------------------------------------------------------------------------ threadWasKilled (_ :: AsyncException) = return () ------------------------------------------------------------------------------ otherException (e :: SomeException) = do let msg = SC.concat [ "Error on startup: \n" , T.encodeUtf8 $ T.pack $ show e ] logE elog' msg SC.hPutStrLn stderr msg throw e -------------------------------------------------------------------------- spawnAll alog elog = {-# SCC "httpServe/spawnAll" #-} do logE elog $ S.concat [ "Server.httpServe: START, binding to " , bshow ports ] let isHttps p = case p of { (HttpsPort _ _ _ _) -> True; _ -> False;} let initHttps = foldr (\p b -> b || isHttps p) False ports if initHttps then TLS.initTLS else return () nports <- mapM bindPort ports let socks = map (\x -> case x of ListenHttp s -> s; ListenHttps s _ -> s) nports (simpleEventLoop defaultTimeout nports numCapabilities (logE elog) (initial socks) $ runHTTP defaultTimeout alog elog handler localHostname) `finally` do logE elog "Server.httpServe: SHUTDOWN" if initHttps then TLS.stopTLS else return () logE elog "Server.httpServe: BACKEND STOPPED" -------------------------------------------------------------------------- bindPort (HttpPort baddr port ) = bindHttp baddr port bindPort (HttpsPort baddr port cert key) = TLS.bindHttps baddr port cert key ------------------------------------------------------------------------------ debugE :: (MonadIO m) => ByteString -> m () debugE s = debug $ "Server: " ++ (map w2c $ S.unpack s) ------------------------------------------------------------------------------ logE :: Maybe (ByteString -> IO ()) -> ByteString -> IO () logE elog = maybe debugE (\l s -> debugE s >> logE' l s) elog ------------------------------------------------------------------------------ logE' :: (ByteString -> IO ()) -> ByteString -> IO () logE' logger s = (timestampedLogEntry s) >>= logger ------------------------------------------------------------------------------ bshow :: (Show a) => a -> ByteString bshow = toBS . show ------------------------------------------------------------------------------ logA :: Maybe (ByteString -> IO ()) -> Request -> Response -> IO () logA alog = maybe (\_ _ -> return ()) logA' alog ------------------------------------------------------------------------------ logA' :: (ByteString -> IO ()) -> Request -> Response -> IO () logA' logger req rsp = do let hdrs = rqHeaders req let host = rqRemoteAddr req let user = Nothing -- TODO we don't do authentication yet let (v, v') = rqVersion req let ver = S.concat [ "HTTP/", bshow v, ".", bshow v' ] let method = toBS $ show (rqMethod req) let reql = S.intercalate " " [ method, rqURI req, ver ] let status = rspStatus rsp let cl = rspContentLength rsp let referer = maybe Nothing (Just . head) $ H.lookup "referer" hdrs let userAgent = maybe "-" head $ H.lookup "user-agent" hdrs msg <- combinedLogEntry host user reql status cl referer userAgent logger msg ------------------------------------------------------------------------------ runHTTP :: Int -- ^ default timeout -> Maybe (ByteString -> IO ()) -- ^ access logger -> Maybe (ByteString -> IO ()) -- ^ error logger -> ServerHandler -- ^ handler procedure -> ByteString -- ^ local host name -> SessionInfo -- ^ session port information -> Enumerator ByteString IO () -- ^ read end of socket -> Iteratee ByteString IO () -- ^ write end of socket -> (FilePath -> Int64 -> Int64 -> IO ()) -- ^ sendfile end -> ((Int -> Int) -> IO ()) -- ^ timeout tickler -> IO () runHTTP defaultTimeout alog elog handler lh sinfo readEnd writeEnd onSendFile tickle = go `catches` [ Handler $ \(_ :: TerminatedBeforeHandlerException) -> do return () , Handler $ \(_ :: ExceptionAlreadyCaught) -> do return () , Handler $ \(_ :: HttpParseException) -> do return () , Handler $ \(e :: AsyncException) -> do throwIO e , Handler $ \(e :: SomeException) -> logE elog $ toByteString $ lmsg e ] where lmsg e = mconcat [ fromByteString "[" , fromShow $ remoteAddress sinfo , fromByteString "]: " , fromByteString "an exception escaped to toplevel:\n" , fromShow e ] go = do buf <- allocBuffer 16384 let iter1 = runServerMonad lh sinfo (logA alog) (logE elog) $ httpSession defaultTimeout writeEnd buf onSendFile tickle handler let iter = iterateeDebugWrapper "httpSession iteratee" iter1 debug "runHTTP/go: prepping iteratee for start" step <- liftIO $ runIteratee iter debug "runHTTP/go: running..." run_ $ readEnd step debug "runHTTP/go: finished" ------------------------------------------------------------------------------ requestErrorMessage :: Request -> SomeException -> Builder requestErrorMessage req e = mconcat [ fromByteString "During processing of request from " , fromByteString $ rqRemoteAddr req , fromByteString ":" , fromShow $ rqRemotePort req , fromByteString "\nrequest:\n" , fromShow $ show req , fromByteString "\n" , msgB ] where msgB = mconcat [ fromByteString "A web handler threw an exception. Details:\n" , fromShow e ] ------------------------------------------------------------------------------ sERVER_HEADER :: ByteString sERVER_HEADER = S.concat ["Snap/", snapServerVersion] ------------------------------------------------------------------------------ snapServerVersion :: ByteString snapServerVersion = SC.pack $ showVersion $ V.version ------------------------------------------------------------------------------ logAccess :: Request -> Response -> ServerMonad () logAccess req rsp = gets _logAccess >>= (\l -> liftIO $ l req rsp) ------------------------------------------------------------------------------ logError :: ByteString -> ServerMonad () logError s = gets _logError >>= (\l -> liftIO $ l s) ------------------------------------------------------------------------------ -- | Runs an HTTP session. httpSession :: Int -> Iteratee ByteString IO () -- ^ write end of socket -> Buffer -- ^ builder buffer -> (FilePath -> Int64 -> Int64 -> IO ()) -- ^ sendfile continuation -> ((Int -> Int) -> IO ()) -- ^ timeout modifier -> ServerHandler -- ^ handler procedure -> ServerMonad () httpSession defaultTimeout writeEnd' buffer onSendFile tickle handler = do let writeEnd = iterateeDebugWrapper "writeEnd" writeEnd' debug "Server.httpSession: entered" mreq <- receiveRequest writeEnd debug "Server.httpSession: receiveRequest finished" -- successfully got a request, so restart timer liftIO $ tickle (max defaultTimeout) case mreq of (Just req) -> do debug $ "Server.httpSession: got request: " ++ show (rqMethod req) ++ " " ++ SC.unpack (rqURI req) ++ " " ++ show (rqVersion req) -- check for Expect: 100-continue checkExpect100Continue req writeEnd logerr <- gets _logError (req',rspOrig) <- (lift $ handler logerr tickle req) `CatchIO.catches` [ CatchIO.Handler $ escapeHttpCatch , CatchIO.Handler $ errCatch "user handler" req ] debug $ "Server.httpSession: finished running user handler" let rspTmp = rspOrig { rspHttpVersion = rqVersion req } checkConnectionClose (rspHttpVersion rspTmp) (rspHeaders rspTmp) cc <- gets _forceConnectionClose let rsp = if cc then (setHeader "Connection" "close" rspTmp) else rspTmp debug "Server.httpSession: handled, skipping request body" if rspTransformingRqBody rsp then debug $ "Server.httpSession: not skipping " ++ "request body, transforming." else do srqEnum <- liftIO $ readIORef $ rqBody req' let (SomeEnumerator rqEnum) = srqEnum skipStep <- (liftIO $ runIteratee $ iterateeDebugWrapper "httpSession/skipToEof" skipToEof) `catch` errCatch "skipping request body" req (lift $ rqEnum skipStep) `catch` errCatch "skipping request body" req debug $ "Server.httpSession: request body skipped, " ++ "sending response" date <- liftIO getDateString let insHeader = H.set "Server" sERVER_HEADER let ins = H.set "Date" date . if isJust (getHeader "Server" rsp) then id else insHeader let rsp' = updateHeaders ins rsp (bytesSent,_) <- sendResponse rsp' buffer writeEnd onSendFile `catch` errCatch "sending response" req debug $ "Server.httpSession: sent " ++ (show bytesSent) ++ " bytes" maybe (logAccess req rsp') (\_ -> logAccess req $ setContentLength bytesSent rsp') (rspContentLength rsp') if cc then do debug $ "httpSession: Connection: Close, harikari" liftIO $ myThreadId >>= killThread else httpSession defaultTimeout writeEnd' buffer onSendFile tickle handler Nothing -> do debug $ "Server.httpSession: parser did not produce a " ++ "request, ending session" return () where escapeHttpCatch :: EscapeHttpException -> ServerMonad a escapeHttpCatch (EscapeHttpException escapeIter) = do lift $ escapeIter tickle writeEnd' throw ExceptionAlreadyCaught errCatch :: ByteString -> Request -> SomeException -> ServerMonad a errCatch phase req e = do logError $ toByteString $ mconcat [ fromByteString "httpSession caught an exception during " , fromByteString phase , fromByteString " phase:\n" , requestErrorMessage req e ] throw ExceptionAlreadyCaught ------------------------------------------------------------------------------ checkExpect100Continue :: Request -> Iteratee ByteString IO () -> ServerMonad () checkExpect100Continue req writeEnd = do let mbEx = getHeaders "Expect" req maybe (return ()) (\l -> if elem "100-continue" l then go else return ()) mbEx where go = do let (major,minor) = rqVersion req let hl = mconcat [ fromByteString "HTTP/" , fromShow major , fromWord8 $ c2w '.' , fromShow minor , fromByteString " 100 Continue\r\n\r\n" ] liftIO $ runIteratee ((enumBS (toByteString hl) >==> enumEOF) $$ writeEnd) return () ------------------------------------------------------------------------------ return411 :: Request -> Iteratee ByteString IO () -> ServerMonad a return411 req writeEnd = do go liftIO $ throwIO $ TerminatedBeforeHandlerException where go = do let (major,minor) = rqVersion req let hl = mconcat [ fromByteString "HTTP/" , fromShow major , fromWord8 $ c2w '.' , fromShow minor , fromByteString " 411 Length Required\r\n\r\n" , fromByteString "411 Length Required\r\n" ] liftIO $ runIteratee ((enumBS (toByteString hl) >==> enumEOF) $$ writeEnd) return () ------------------------------------------------------------------------------ receiveRequest :: Iteratee ByteString IO () -> ServerMonad (Maybe Request) receiveRequest writeEnd = do debug "receiveRequest: entered" mreq <- {-# SCC "receiveRequest/parseRequest" #-} lift $ iterateeDebugWrapper "parseRequest" $ joinI' $ takeNoMoreThan maxHeadersSize $$ parseRequest debug "receiveRequest: parseRequest returned" case mreq of (Just ireq) -> do req' <- toRequest ireq setEnumerator req' req <- parseForm req' checkConnectionClose (rqVersion req) (rqHeaders req) return $! Just req Nothing -> return Nothing where -------------------------------------------------------------------------- -- TODO(gdc): make this a policy decision (expose in -- Snap.Http.Server.Config) maxHeadersSize = 256 * 1024 -------------------------------------------------------------------------- -- check: did the client specify "transfer-encoding: chunked"? then we -- have to honor that. -- -- otherwise: check content-length header. if set: only take N bytes from -- the read end of the socket -- -- if no content-length and no chunked encoding, enumerate the entire -- socket and close afterwards setEnumerator :: Request -> ServerMonad () setEnumerator req = {-# SCC "receiveRequest/setEnumerator" #-} do if isChunked then do debug $ "receiveRequest/setEnumerator: " ++ "input in chunked encoding" let e = joinI . readChunkedTransferEncoding liftIO $ writeIORef (rqBody req) (SomeEnumerator e) else maybe (noContentLength req) hasContentLength mbCL where isChunked = maybe False ((== ["chunked"]) . map CI.mk) (H.lookup "transfer-encoding" hdrs) hasContentLength :: Int64 -> ServerMonad () hasContentLength len = do debug $ "receiveRequest/setEnumerator: " ++ "request had content-length " ++ show len liftIO $ writeIORef (rqBody req) (SomeEnumerator e) debug "receiveRequest/setEnumerator: body enumerator set" where e :: Enumerator ByteString IO a e st = do st' <- lift $ runIteratee $ iterateeDebugWrapper "rqBody iterator" $ returnI st joinI $ takeExactly len st' noContentLength :: Request -> ServerMonad () noContentLength rq = do debug ("receiveRequest/setEnumerator: " ++ "request did NOT have content-length") when (rqMethod rq == POST || rqMethod rq == PUT) $ return411 req writeEnd let enum = SomeEnumerator $ iterateeDebugWrapper "noContentLength" . joinI . I.take 0 liftIO $ writeIORef (rqBody rq) enum debug "receiveRequest/setEnumerator: body enumerator set" hdrs = rqHeaders req mbCL = H.lookup "content-length" hdrs >>= return . unsafeFromInt . head -------------------------------------------------------------------------- parseForm :: Request -> ServerMonad Request parseForm req = {-# SCC "receiveRequest/parseForm" #-} if doIt then getIt else return req where mbCT = liftM head $ H.lookup "content-type" (rqHeaders req) trimIt = fst . SC.spanEnd isSpace . SC.takeWhile (/= ';') . SC.dropWhile isSpace mbCT' = liftM trimIt mbCT doIt = mbCT' == Just "application/x-www-form-urlencoded" maximumPOSTBodySize :: Int64 maximumPOSTBodySize = 10*1024*1024 getIt :: ServerMonad Request getIt = {-# SCC "receiveRequest/parseForm/getIt" #-} do debug "parseForm: got application/x-www-form-urlencoded" debug "parseForm: reading POST body" senum <- liftIO $ readIORef $ rqBody req let (SomeEnumerator enum) = senum consumeStep <- liftIO $ runIteratee consume step <- liftIO $ runIteratee $ joinI $ takeNoMoreThan maximumPOSTBodySize consumeStep body <- liftM S.concat $ lift $ enum step let newParams = parseUrlEncoded body debug "parseForm: stuffing 'enumBS body' into request" let e = enumBS body >==> I.joinI . I.take 0 let e' = \st -> do let ii = iterateeDebugWrapper "regurgitate body" (returnI st) st' <- lift $ runIteratee ii e st' liftIO $ writeIORef (rqBody req) $ SomeEnumerator e' return $! req { rqParams = Map.unionWith (++) (rqParams req) newParams , rqPostParams = newParams } -------------------------------------------------------------------------- toRequest (IRequest method uri version kvps) = {-# SCC "receiveRequest/toRequest" #-} do localAddr <- gets $ localAddress . _sessionPort lport <- gets $ localPort . _sessionPort remoteAddr <- gets $ remoteAddress . _sessionPort rport <- gets $ remotePort . _sessionPort localHostname <- gets $ _localHostname secure <- gets $ isSecure . _sessionPort let (serverName, serverPort) = fromMaybe (localHostname, lport) (liftM (parseHost . head) (H.lookup "host" hdrs)) -- will override in "setEnumerator" enum <- liftIO $ newIORef $ SomeEnumerator (enumBS "") return $! Request serverName serverPort remoteAddr rport localAddr lport localHostname secure hdrs enum mbContentLength method version cookies pathInfo contextPath uri queryString params params Map.empty where dropLeadingSlash s = maybe s f mbS where f (a,s') = if a == c2w '/' then s' else s mbS = S.uncons s hdrs = toHeaders kvps mbContentLength = liftM (unsafeFromInt . head) $ H.lookup "content-length" hdrs cookies = concat $ maybe [] (catMaybes . map parseCookie) (H.lookup "cookie" hdrs) contextPath = "/" parseHost h = (a, unsafeFromInt (S.drop 1 b)) where (a,b) = S.break (== (c2w ':')) h params = parseUrlEncoded queryString (pathInfo, queryString) = first dropLeadingSlash . second (S.drop 1) $ S.break (== (c2w '?')) uri ------------------------------------------------------------------------------ -- Response must be well-formed here sendResponse :: forall a . Response -> Buffer -> Iteratee ByteString IO a -- ^ iteratee write end -> (FilePath -> Int64 -> Int64 -> IO a) -- ^ function to call on -- sendfile -> ServerMonad (Int64, a) sendResponse rsp0 buffer writeEnd' onSendFile = do let rsp1 = renderCookies rsp0 let (rsp, shouldClose) = if isNothing $ rspContentLength rsp1 then noCL rsp1 else (rsp1, False) when shouldClose $ modify $! \s -> s { _forceConnectionClose = True } let (!headerString,!hlen) = mkHeaderBuilder rsp let writeEnd = fixCLIteratee hlen rsp writeEnd' (!x,!bs) <- case (rspBody rsp) of (Enum e) -> lift $ whenEnum writeEnd headerString hlen rsp e (SendFile f Nothing) -> lift $ whenSendFile writeEnd headerString rsp f 0 (SendFile f (Just (st,_))) -> lift $ whenSendFile writeEnd headerString rsp f st debug "sendResponse: response sent" return $! (bs,x) where -------------------------------------------------------------------------- noCL :: Response -> (Response, Bool) noCL r = if rspHttpVersion r >= (1,1) then let r' = setHeader "Transfer-Encoding" "chunked" r origE = rspBodyToEnum $ rspBody r e = \i -> joinI $ origE $$ chunkIt i in (r' { rspBody = Enum e }, False) else -- HTTP/1.0 and no content-length? We'll have to close the -- socket. (setHeader "Connection" "close" r, True) {-# INLINE noCL #-} -------------------------------------------------------------------------- chunkIt :: forall x . Enumeratee Builder Builder IO x chunkIt = checkDone $ continue . step where step k EOF = k (Chunks [chunkedTransferTerminator]) >>== return step k (Chunks []) = continue $ step k step k (Chunks xs) = k (Chunks [chunkedTransferEncoding $ mconcat xs]) >>== chunkIt -------------------------------------------------------------------------- whenEnum :: Iteratee ByteString IO a -> Builder -> Int -> Response -> (forall x . Enumerator Builder IO x) -> Iteratee ByteString IO (a,Int64) whenEnum writeEnd hs hlen rsp e = do -- "enum" here has to be run in the context of the READ iteratee, even -- though it's writing to the output, because we may be transforming -- the input. That's why we check if we're transforming the request -- body here, and if not, send EOF to the write end; so that it -- doesn't join up with the read iteratee and try to get more data -- from the socket. let eBuilder = enumBuilder hs >==> e let enum = if rspTransformingRqBody rsp then eBuilder else eBuilder >==> mapEnum toByteString fromByteString (joinI . I.take 0) debug $ "sendResponse: whenEnum: enumerating bytes" outstep <- lift $ runIteratee $ iterateeDebugWrapper "countBytes writeEnd" $ countBytes writeEnd let bufferFunc = if getBufferingMode rsp then unsafeBuilderToByteString (return buffer) else I.map (toByteString . (`mappend` flush)) (x,bs) <- mapIter fromByteString toByteString (enum $$ joinI $ bufferFunc outstep) debug $ "sendResponse: whenEnum: " ++ show bs ++ " bytes enumerated" return (x, bs - fromIntegral hlen) -------------------------------------------------------------------------- whenSendFile :: Iteratee ByteString IO a -- ^ write end -> Builder -- ^ headers -> Response -> FilePath -- ^ file to send -> Int64 -- ^ start byte offset -> Iteratee ByteString IO (a,Int64) whenSendFile writeEnd hs r f start = do -- Guaranteed to have a content length here. Sending EOF through to -- the write end guarantees that we flush the buffer before we send -- the file with sendfile(). lift $ runIteratee ((enumBuilder hs >==> enumEOF) $$ unsafeBuilderToByteString (return buffer) $$ writeEnd) let !cl = fromJust $ rspContentLength r x <- liftIO $ onSendFile f start cl return (x, cl) -------------------------------------------------------------------------- (major,minor) = rspHttpVersion rsp0 -------------------------------------------------------------------------- buildHdrs :: Headers -> (Builder,Int) buildHdrs hdrs = {-# SCC "buildHdrs" #-} H.fold f (mempty,0) hdrs where f (!b,!len) !k !ys = let (!b',len') = h k ys in (b `mappend` b', len+len') crlf = fromByteString "\r\n" doOne pre plen (b,len) y = ( mconcat [ b , pre , fromByteString y , crlf ] , len + plen + 2 + S.length y ) h k ys = foldl' (doOne kb klen) (mempty,0) ys where k' = CI.original k kb = fromByteString k' `mappend` fromByteString ": " klen = S.length k' + 2 -------------------------------------------------------------------------- fixCLIteratee :: Int -- ^ header length -> Response -- ^ response -> Iteratee ByteString IO a -- ^ write end -> Iteratee ByteString IO a fixCLIteratee hlen resp we = maybe we f mbCL where f cl = case rspBody resp of (Enum _) -> joinI $ takeExactly (cl + fromIntegral hlen) $$ we (SendFile _ _) -> we mbCL = rspContentLength resp -------------------------------------------------------------------------- renderCookies :: Response -> Response renderCookies r = updateHeaders f r where f h = if null cookies then h else foldl' (\m v -> H.insert "Set-Cookie" v m) h cookies cookies = fmap cookieToBS . Map.elems $ rspCookies r -------------------------------------------------------------------------- mkHeaderBuilder :: Response -> (Builder,Int) mkHeaderBuilder r = {-# SCC "mkHeaderBuilder" #-} ( mconcat [ fromByteString "HTTP/" , fromString majstr , fromWord8 $ c2w '.' , fromString minstr , space , fromString $ statstr , space , fromByteString reason , crlf , hdrs , crlf ] , 12 + majlen + minlen + statlen + S.length reason + hlen ) where (hdrs,hlen) = buildHdrs $ headers r majstr = show major minstr = show minor majlen = length majstr minlen = length minstr statstr = show $ rspStatus r statlen = length statstr crlf = fromByteString "\r\n" space = fromWord8 $ c2w ' ' reason = rspStatusReason r ------------------------------------------------------------------------------ checkConnectionClose :: (Int, Int) -> Headers -> ServerMonad () checkConnectionClose ver hdrs = -- For HTTP/1.1: -- if there is an explicit Connection: close, close the socket. -- For HTTP/1.0: -- if there is no explicit Connection: Keep-Alive, close the socket. if (ver == (1,1) && l == Just ["close"]) || (ver == (1,0) && l /= Just ["keep-alive"]) then modify $ \s -> s { _forceConnectionClose = True } else return () where l = liftM (map tl) $ H.lookup "Connection" hdrs tl = S.map (c2w . toLower . w2c) ------------------------------------------------------------------------------ -- FIXME: whitespace-trim the values here. toHeaders :: [(ByteString,ByteString)] -> Headers toHeaders kvps = H.fromList kvps' where kvps' = map (first CI.mk) kvps ------------------------------------------------------------------------------ -- | Convert 'Cookie' into 'ByteString' for output. cookieToBS :: Cookie -> ByteString cookieToBS (Cookie k v mbExpTime mbDomain mbPath isSec isHOnly) = cookie where cookie = S.concat [k, "=", v, path, exptime, domain, secure, hOnly] path = maybe "" (S.append "; path=") mbPath domain = maybe "" (S.append "; domain=") mbDomain exptime = maybe "" (S.append "; expires=" . fmt) mbExpTime secure = if isSec then "; Secure" else "" hOnly = if isHOnly then "; HttpOnly" else "" fmt = fromStr . formatTime defaultTimeLocale "%a, %d-%b-%Y %H:%M:%S GMT" ------------------------------------------------------------------------------ l2s :: L.ByteString -> S.ByteString l2s = S.concat . L.toChunks ------------------------------------------------------------------------------ toBS :: String -> ByteString toBS = S.pack . map c2w