- relyOnRequest :: Interaction -> STM ()
- relyOnRequest itr
- = do status <- readItr itr itrResponse resStatus
-
- let req = fromJust $ itrRequest itr
- reqVer = reqVersion req
- canHaveBody = if reqMethod req == HEAD then
- False
- else
- not (isInformational status ||
- status == NoContent ||
- status == ResetContent ||
- status == NotModified )
-
- updateRes itr $ deleteHeader "Content-Length"
-
- cType <- readHeader itr "Content-Type"
- when (cType == Nothing)
- $ updateRes itr $ setHeader "Content-Type" defaultPageContentType
-
- if canHaveBody then
- do teM <- readHeader itr "Transfer-Encoding"
- if reqVer == HttpVersion 1 1 then
-
- do case teM of
- Nothing -> updateRes itr $ setHeader "Transfer-Encoding" "chunked"
- Just te -> let teList = [trim isWhiteSpace x
- | x <- splitBy (== ',') (map toLower te)]
- in
- when (teList == [] || last teList /= "chunked")
- $ abortSTM InternalServerError []
- $ Just ("Transfer-Encoding must end with `chunked' "
- ++ "because this is an HTTP/1.1 request: "
- ++ te)
-
- writeItr itr itrWillChunkBody True
- else
- case fmap (map toLower) teM of
- Nothing -> return ()
- Just "identity" -> return ()
- Just te -> abortSTM InternalServerError []
- $ Just ("Transfer-Encoding must be `identity' because "
- ++ "this is an HTTP/1.0 request: "
- ++ te)
- else
- -- body 関連のヘッダを削除。但し HEAD なら Content-* は殘す
- do updateRes itr $ deleteHeader "Transfer-Encoding"
- when (reqMethod req /= HEAD)
- $ do updateRes itr $ deleteHeader "Content-Type"
- updateRes itr $ deleteHeader "Etag"
- updateRes itr $ deleteHeader "Last-Modified"
-
- conn <- readHeader itr "Connection"
- case fmap (map toLower) conn of
- Just "close" -> writeItr itr itrWillClose True
- _ -> return ()
-
- willClose <- readItr itr itrWillClose id
- when willClose
- $ updateRes itr $ setHeader "Connection" "close"
-
- when (reqMethod req == HEAD || not canHaveBody)
- $ writeTVar (itrWillDiscardBody itr) True
-
- readHeader :: Interaction -> String -> STM (Maybe String)
- readHeader itr name
- = readItr itr itrResponse $ getHeader name
-
- updateRes :: Interaction -> (Response -> Response) -> STM ()
- updateRes itr updator
- = updateItr itr itrResponse updator
-
-
-completeUnconditionalHeaders :: Config -> Response -> IO Response
-completeUnconditionalHeaders conf res
- = return res >>= compServer >>= compDate >>= return
- where
- compServer res
- = case getHeader "Server" res of
- Nothing -> return $ addHeader "Server" (cnfServerSoftware conf) res
- Just _ -> return res
-
- compDate res
- = case getHeader "Date" res of
- Nothing -> do time <- getClockTime
- return $ addHeader "Date" (formatHTTPDateTime time) res
- 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 willDiscardBody ← readTVar niWillDiscardBody
+ canHaveBody ← if willDiscardBody then
+ return False
+ else
+ resCanHaveBody <$> readTVar niResponse
+
+ updateRes ni
+ $ deleteHeader "Content-Length"
+ ∘ deleteHeader "Transfer-Encoding"
+
+ if canHaveBody then
+ do when niWillChunkBody $
+ writeHeader ni "Transfer-Encoding" (Just "chunked")
+ writeDefaultPageIfNeeded ni
+ else
+ do writeTVar niWillDiscardBody True
+ -- 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