+{-# LANGUAGE
+ DoAndIfThenElse
+ , OverloadedStrings
+ , RecordWildCards
+ , UnicodeSyntax
+ #-}
module Network.HTTP.Lucu.Postprocess
- ( postprocess -- Interaction -> STM ()
- , completeUnconditionalHeaders -- Response -> IO Response
+ ( postprocess
)
where
-
-import Control.Concurrent.STM
-import Control.Monad
-import Data.Char
-import Data.Maybe
-import GHC.Conc (unsafeIOToSTM)
-import Network.HTTP.Lucu.Headers
-import Network.HTTP.Lucu.HttpVersion
-import Network.HTTP.Lucu.Interaction
-import Network.HTTP.Lucu.RFC1123DateTime
-import Network.HTTP.Lucu.Request
-import Network.HTTP.Lucu.Response
-import Network.HTTP.Lucu.Utils
-import System.Time
-
-{-
-
- * Response が未設定なら、HTTP/1.1 500 Internal Server Error にする。
-
- * Content-Length があれば、それを削除する。
-
- * HTTP/1.1 であり、且つ body を持つ事が出來る時、Transfer-Encoding の
- 最後の要素が chunked でなければ 500 Internal Error にする。
- Transfer-Encoding が未設定であれば、chunked に設定する。
-
- * HTTP/1.0 なのに Transfer-Encoding が設定濟なら 500 Internal Server
- Error にする。但し identity だけは許す。
-
- * body を持つ事が出來る時、Content-Type が無ければ
- application/octet-stream にする。出來ない時、HEAD でなければ
- Content-Type を削除する。
-
- * body を持つ事が出來ない時、body 破棄フラグを立てる。
-
- * Connection: close が設定されてゐる時、切斷フラグを立てる。
-
- * 切斷フラグが立ってゐる時、Connection: close を設定する。
-
- * Server が無ければ設定。
-
- * Date が無ければ設定。
-
--}
-
-{- Postprocess は body を補完した後で實行する事 -}
-
-postprocess :: Interaction -> STM ()
-postprocess itr
- = do res <- readTVar (itrResponse itr)
-
- when (res == Nothing)
- $ setStatus itr InternalServerError
-
- when (itrRequest itr /= Nothing)
- $ relyOnRequest itr
-
- do oldRes <- readTVar (itrResponse itr)
- newRes <- unsafeIOToSTM $ completeUnconditionalHeaders $ fromJust oldRes
- setRes itr newRes
+import Control.Applicative
+import Control.Concurrent.STM
+import Control.Monad
+import Control.Monad.Unicode
+import Data.Ascii (Ascii, CIAscii, AsciiBuilder)
+import Data.Convertible.Base
+import Data.Maybe
+import Data.Monoid.Unicode
+import GHC.Conc (unsafeIOToSTM)
+import Network.HTTP.Lucu.Abortion
+import Network.HTTP.Lucu.Config
+import Network.HTTP.Lucu.DefaultPage
+import Network.HTTP.Lucu.Headers
+import Network.HTTP.Lucu.Interaction
+import Network.HTTP.Lucu.Request
+import Network.HTTP.Lucu.Response
+import Prelude.Unicode
+
+postprocess ∷ NormalInteraction → STM ()
+postprocess ni@(NI {..})
+ = do void $ tryPutTMVar niSendContinue False
+ abortOnCertainConditions ni
+ postprocessWithRequest ni
+ completeUnconditionalHeaders ni
+
+abortOnCertainConditions ∷ NormalInteraction → STM ()
+abortOnCertainConditions (NI {..})
+ = readTVar niResponse ≫= go
where
- relyOnRequest itr
- = do resM <- readTVar (itrResponse itr)
-
- let req = fromJust $ itrRequest itr
- reqVer = reqVersion req
- res = fromJust resM
- status = resStatus res
- canHaveBody = if reqMethod req == HEAD then
- False
- else
- isInformational status ||
- status == NoContent ||
- status == ResetContent ||
- status == NotModified
-
- setRes itr (deleteHeader res "Content-Length")
-
- if canHaveBody then
- do if reqVer == HttpVersion 1 1 then
-
- case getHeader res "Transfer-Encoding" of
- Nothing -> setRes itr (setHeader res "Transfer-Encoding" "chunked")
- Just te -> let teList = [trim isWhiteSpace x
- | x <- splitBy (== ',') (map toLower te)]
- in
- when (teList == [] || last teList /= "chunked")
- $ setStatus itr InternalServerError
- else
- case getHeader res "Transfer-Encoding" of
- Nothing -> return ()
- Just "identity" -> return ()
- _ -> setStatus itr InternalServerError
-
- when (getHeader res "Content-Type" == Nothing)
- $ setRes itr (setHeader res "Content-Type" "application/octet-stream")
- else
- -- body 関連のヘッダを削除。但し HEAD なら Content-* は殘す
- do setRes itr (deleteHeader res "Transfer-Encoding")
- when (reqMethod req /= HEAD)
- $ setRes itr (deleteHeader res "Content-Type")
-
- if fmap (map toLower) (getHeader res "Connection") == Just "close" then
- writeTVar (itrWillClose itr) True
- else
- setRes itr (setHeader res "Connection" "close")
-
- when (reqMethod req == HEAD || not canHaveBody)
- $ writeTVar (itrWillDiscardBody itr) True
-
- setStatus itr status
- = writeTVar (itrResponse itr) (Just $ Response {
- resVersion = HttpVersion 1 1
- , resStatus = status
- , resHeaders = []
- })
-
- setRes itr res
- = writeTVar (itrResponse itr) (Just res)
-
-
-completeUnconditionalHeaders :: Response -> IO Response
-completeUnconditionalHeaders res
- = return res >>= compServer >>= compDate >>= return
- where
- compServer res
- = case getHeader res "Server" of
- Nothing -> return $ addHeader res "Server" "Lucu/1.0"
- Just _ -> return res
-
- compDate res
- = case getHeader res "Date" of
- Nothing -> do time <- getClockTime
- return $ addHeader res "Date" $ formatHTTPDateTime time
- Just _ -> return res
\ No newline at end of file
+ go ∷ Response → STM ()
+ go res@(Response {..})
+ = do unless (any (\ p → p resStatus) [ isSuccessful
+ , isRedirection
+ , isError
+ ])
+ $ abort'
+ $ cs ("Inappropriate status code for a response: " ∷ Ascii)
+ ⊕ cs resStatus
+
+ when ( resStatus ≈ MethodNotAllowed ∧
+ hasHeader "Allow" res )
+ $ abort'
+ $ cs ("The status was " ∷ Ascii)
+ ⊕ cs resStatus
+ ⊕ cs (" but no \"Allow\" header." ∷ Ascii)
+
+ when ( resStatus ≉ NotModified ∧
+ isRedirection resStatus ∧
+ hasHeader "Location" res )
+ $ abort'
+ $ cs ("The status code was " ∷ Ascii)
+ ⊕ cs resStatus
+ ⊕ cs (" but no Location header." ∷ Ascii)
+
+ abort' ∷ AsciiBuilder → STM ()
+ abort' = throwSTM
+ ∘ mkAbortion' InternalServerError
+ ∘ cs
+
+postprocessWithRequest ∷ NormalInteraction → STM ()
+postprocessWithRequest ni@(NI {..})
+ = do updateRes ni
+ $ deleteHeader "Content-Length"
+ ∘ deleteHeader "Transfer-Encoding"
+
+ canHaveBody ← resCanHaveBody <$> readTVar niResponse
+ if canHaveBody then
+ do when niWillChunkBody
+ $ writeHeader ni "Transfer-Encoding" (Just "chunked")
+ when (reqMethod niRequest ≢ HEAD)
+ $ writeDefaultPageIfNeeded ni
+ else
+ -- These headers make sense for HEAD requests even when
+ -- there won't be a response entity body.
+ when (reqMethod niRequest ≢ HEAD)
+ $ updateRes ni
+ $ deleteHeader "Content-Type"
+ ∘ deleteHeader "Etag"
+ ∘ deleteHeader "Last-Modified"
+
+ hasConnClose ← (≡ Just "close") <$> readCIHeader ni "Connection"
+ willClose ← readTVar niWillClose
+ when (hasConnClose ∧ (¬) willClose)
+ $ writeTVar niWillClose True
+ when ((¬) hasConnClose ∧ willClose)
+ $ writeHeader ni "Connection" (Just "close")
+
+writeDefaultPageIfNeeded ∷ NormalInteraction → STM ()
+writeDefaultPageIfNeeded ni@(NI {..})
+ = do resHasCType ← readTVar niResponseHasCType
+ unless resHasCType
+ $ do writeHeader ni "Content-Type" $ Just defaultPageContentType
+ writeHeader ni "Content-Encoding" Nothing
+ res ← readTVar niResponse
+ let body = defaultPageForResponse niConfig (Just niRequest) res
+ putTMVar niBodyToSend body
+
+completeUnconditionalHeaders ∷ NormalInteraction → STM ()
+completeUnconditionalHeaders ni@(NI {..})
+ = do srv ← readHeader ni "Server"
+ when (isNothing srv) $
+ writeHeader ni "Server" $ Just $ cnfServerSoftware niConfig
+
+ date ← readHeader ni "Date"
+ when (isNothing date) $
+ do date' ← unsafeIOToSTM getCurrentDate
+ writeHeader ni "Date" $ Just date'
+
+writeHeader ∷ NormalInteraction → CIAscii → Maybe Ascii → STM ()
+{-# INLINE writeHeader #-}
+writeHeader ni k v
+ = case v of
+ Just v' → updateRes ni $ setHeader k v'
+ Nothing → updateRes ni $ deleteHeader k
+
+readHeader ∷ NormalInteraction → CIAscii → STM (Maybe Ascii)
+{-# INLINE readHeader #-}
+readHeader (NI {..}) k
+ = getHeader k <$> readTVar niResponse
+
+readCIHeader ∷ NormalInteraction → CIAscii → STM (Maybe CIAscii)
+{-# INLINE readCIHeader #-}
+readCIHeader (NI {..}) k
+ = getCIHeader k <$> readTVar niResponse
+
+updateRes ∷ NormalInteraction → (Response → Response) → STM ()
+{-# INLINE updateRes #-}
+updateRes (NI {..}) f
+ = do old ← readTVar niResponse
+ writeTVar niResponse $ f old
projects / Lucu.git / blobdiff