--- #hide
+{-# LANGUAGE
+ DoAndIfThenElse
+ , OverloadedStrings
+ , RecordWildCards
+ , UnicodeSyntax
+ #-}
module Network.HTTP.Lucu.Postprocess
( postprocess
, completeUnconditionalHeaders
)
where
-
-import Control.Concurrent.STM
-import Control.Monad
-import Data.Char
-import Data.Maybe
-import GHC.Conc (unsafeIOToSTM)
-import Network.HTTP.Lucu.Abortion
-import Network.HTTP.Lucu.Config
-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、200 OK にする。
-
- * ステータスが 2xx, 3xx, 4xx, 5xx のいずれでもなければ 500 にする。
-
- * 405 Method Not Allowed なのに Allow ヘッダが無ければ 500 にする。
-
- * 304 Not Modified 以外の 3xx なのに Location ヘッダが無ければ 500 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 が無ければデフォルト値にする。
- 出來ない時、HEAD でなければContent-Type, Etag, Last-Modified 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 :: Interaction -> STM ()
-postprocess itr
- = do res <- readItr itr itrResponse id
- let sc = resStatus res
-
- when (not $ any (\ p -> p sc) [isSuccessful, isRedirection, isError])
- $ abortSTM InternalServerError []
- $ Just ("The status code is not good for a final status: "
- ++ show sc)
-
- when (sc == MethodNotAllowed && getHeader "Allow" res == Nothing)
- $ abortSTM InternalServerError []
- $ Just ("The status was " ++ show sc ++ " but no Allow header.")
-
- when (sc /= NotModified && isRedirection sc && getHeader "Location" res == Nothing)
- $ abortSTM InternalServerError []
- $ Just ("The status code was " ++ show sc ++ " but no Location header.")
-
- when (itrRequest itr /= Nothing)
- $ relyOnRequest itr
-
- do newRes <- unsafeIOToSTM
- $ completeUnconditionalHeaders (itrConfig itr) res
- writeItr itr itrResponse newRes
+import Control.Applicative
+import Control.Concurrent.STM
+import Control.Monad
+import Control.Monad.Unicode
+import Data.Ascii (Ascii, CIAscii, AsciiBuilder)
+import qualified Data.Ascii as A
+import Data.Monoid.Unicode
+import Data.Time
+import qualified Data.Time.HTTP as HTTP
+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.HttpVersion
+import Network.HTTP.Lucu.Interaction
+import Network.HTTP.Lucu.Request
+import Network.HTTP.Lucu.Response
+import Prelude.Unicode
+
+postprocess ∷ Interaction → STM ()
+postprocess itr@(Interaction {..})
+ = do abortOnCertainConditions itr
+
+ case itrRequest of
+ Just req → postprocessWithRequest itr req
+ Nothing → return ()
+
+ updateResIO itr $ completeUnconditionalHeaders itrConfig
+
+abortOnCertainConditions ∷ Interaction → STM ()
+abortOnCertainConditions (Interaction {..})
+ = readTVar itrResponse ≫= go
where
- 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
+ go ∷ Response → STM ()
+ go res@(Response {..})
+ = do unless (any (\ p → p resStatus) [ isSuccessful
+ , isRedirection
+ , isError
+ ])
+ $ abort'
+ $ A.toAsciiBuilder "Inappropriate status code for a response: "
+ ⊕ printStatusCode resStatus
+
+ when ( resStatus ≡ MethodNotAllowed ∧
+ hasHeader "Allow" res )
+ $ abort'
+ $ A.toAsciiBuilder "The status was "
+ ⊕ printStatusCode resStatus
+ ⊕ A.toAsciiBuilder " but no \"Allow\" header."
+
+ when ( resStatus ≢ NotModified ∧
+ isRedirection resStatus ∧
+ hasHeader "Location" res )
+ $ abort'
+ $ A.toAsciiBuilder "The status code was "
+ ⊕ printStatusCode resStatus
+ ⊕ A.toAsciiBuilder " but no Location header."
+
+ abort' ∷ AsciiBuilder → STM ()
+ abort' = abortSTM InternalServerError []
+ ∘ Just
+ ∘ A.toText
+ ∘ A.fromAsciiBuilder
+
+postprocessWithRequest ∷ Interaction → Request → STM ()
+postprocessWithRequest itr@(Interaction {..}) (Request {..})
+ = do willDiscardBody ← readTVar itrWillDiscardBody
+ canHaveBody ← if willDiscardBody then
+ return False
+ else
+ resCanHaveBody <$> readTVar itrResponse
+
+ updateRes itr
+ $ deleteHeader "Content-Length"
+ ∘ deleteHeader "Transfer-Encoding"
+
+ if canHaveBody then
+ do when (reqVersion ≡ HttpVersion 1 1)
+ $ do writeHeader itr "Transfer-Encoding" (Just "chunked")
+ writeTVar itrWillChunkBody True
+ writeDefaultPageIfNeeded itr
+ else
+ do writeTVar itrWillDiscardBody True
+ -- These headers make sense for HEAD requests even
+ -- when there won't be a response entity body.
+ when (reqMethod ≢ HEAD)
+ $ updateRes itr
+ $ deleteHeader "Content-Type"
+ ∘ deleteHeader "Etag"
+ ∘ deleteHeader "Last-Modified"
+
+ hasConnClose ← (≡ Just "close") <$> readCIHeader itr "Connection"
+ willClose ← readTVar itrWillClose
+ when (hasConnClose ∧ (¬) willClose)
+ $ writeTVar itrWillClose True
+ when ((¬) hasConnClose ∧ willClose)
+ $ writeHeader itr "Connection" (Just "close")
+
+writeDefaultPageIfNeeded ∷ Interaction → STM ()
+writeDefaultPageIfNeeded itr@(Interaction {..})
+ = do resHasCType ← readTVar itrResponseHasCType
+ unless resHasCType
+ $ do writeHeader itr "Content-Type" (Just defaultPageContentType)
+ writeHeader itr "Content-Encoding" Nothing
+ res ← readTVar itrResponse
+ let page = getDefaultPage itrConfig itrRequest res
+ putTMVar itrBodyToSend page
+
+writeHeader ∷ Interaction → CIAscii → Maybe Ascii → STM ()
+{-# INLINE writeHeader #-}
+writeHeader itr k v
+ = case v of
+ Just v' → updateRes itr $ setHeader k v'
+ Nothing → updateRes itr $ deleteHeader k
+
+readCIHeader ∷ Interaction → CIAscii → STM (Maybe CIAscii)
+{-# INLINE readCIHeader #-}
+readCIHeader (Interaction {..}) k
+ = getCIHeader k <$> readTVar itrResponse
+
+updateRes ∷ Interaction → (Response → Response) → STM ()
+{-# INLINE updateRes #-}
+updateRes (Interaction {..}) f
+ = do old ← readTVar itrResponse
+ writeTVar itrResponse (f old)
+
+updateResIO ∷ Interaction → (Response → IO Response) → STM ()
+{-# INLINE updateResIO #-}
+updateResIO (Interaction {..}) f
+ = do old ← readTVar itrResponse
+ new ← unsafeIOToSTM $ f old
+ writeTVar itrResponse new
+
+completeUnconditionalHeaders ∷ Config → Response → IO Response
+completeUnconditionalHeaders conf = (compDate =≪) ∘ compServer
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
+ compServer res'
+ = case getHeader "Server" res' of
+ Nothing → return $ setHeader "Server" (cnfServerSoftware conf) res'
+ Just _ → return res'
+
+ compDate res'
+ = case getHeader "Date" res' of
+ Nothing → do date ← getCurrentDate
+ return $ setHeader "Date" date res'
+ Just _ → return res'
+
+getCurrentDate ∷ IO Ascii
+getCurrentDate = HTTP.toAscii <$> getCurrentTime