+{-# LANGUAGE
+ DoAndIfThenElse
+ , OverloadedStrings
+ , RecordWildCards
+ , UnicodeSyntax
+ #-}
module Network.HTTP.Lucu.Postprocess
( postprocess
- , completeUnconditionalHeaders
)
where
-
-import Control.Concurrent.STM
-import Control.Monad
-import qualified Data.ByteString as Strict (ByteString)
-import qualified Data.ByteString.Char8 as C8 hiding (ByteString)
-import Data.IORef
-import Data.Maybe
-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.Headers
-import Network.HTTP.Lucu.HttpVersion
-import Network.HTTP.Lucu.Interaction
-import Network.HTTP.Lucu.Request
-import Network.HTTP.Lucu.Response
-import System.IO.Unsafe
-
-{-
-
- * 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。Transfer-Encoding があって
- も削除する。
-
- * HTTP/1.1 であり、body を持つ事が出來る時、Transfer-Encoding を
- chunked に設定する。
-
- * 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 reqM <- readItr itr itrRequest id
- res <- readItr itr itrResponse id
- let sc = resStatus res
-
- unless (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 (C8.pack "Allow") res == Nothing)
- $ abortSTM InternalServerError []
- $ Just ("The status was " ++ show sc ++ " but no Allow header.")
-
- when (sc /= NotModified && isRedirection sc && getHeader (C8.pack "Location") res == Nothing)
- $ abortSTM InternalServerError []
- $ Just ("The status code was " ++ show sc ++ " but no Location header.")
-
- when (reqM /= Nothing) relyOnRequest
-
- -- itrResponse の内容は relyOnRequest によって變へられてゐる可
- -- 能性が高い。
- do oldRes <- readItr itr itrResponse id
- newRes <- unsafeIOToSTM
- $ completeUnconditionalHeaders (itrConfig itr) oldRes
- writeItr itr itrResponse newRes
- where
- relyOnRequest :: STM ()
- relyOnRequest
- = do status <- readItr itr itrResponse resStatus
- req <- readItr itr itrRequest fromJust
-
- let reqVer = reqVersion req
- canHaveBody = if reqMethod req == HEAD then
- False
- else
- not (isInformational status ||
- status == NoContent ||
- status == ResetContent ||
- status == NotModified )
-
- updateRes $! deleteHeader (C8.pack "Content-Length")
- updateRes $! deleteHeader (C8.pack "Transfer-Encoding")
-
- cType <- readHeader (C8.pack "Content-Type")
- when (cType == Nothing)
- $ updateRes $ setHeader (C8.pack "Content-Type") defaultPageContentType
-
- if canHaveBody then
- when (reqVer == HttpVersion 1 1)
- $ do updateRes $! setHeader (C8.pack "Transfer-Encoding") (C8.pack "chunked")
- writeItr itr itrWillChunkBody True
- else
- -- body 関連のヘッダを削除。但し HEAD なら Content-* は殘す
- when (reqMethod req /= HEAD)
- $ do updateRes $! deleteHeader (C8.pack "Content-Type")
- updateRes $! deleteHeader (C8.pack "Etag")
- updateRes $! deleteHeader (C8.pack "Last-Modified")
-
- conn <- readHeader (C8.pack "Connection")
- case conn of
- Nothing -> return ()
- Just value -> when (value `noCaseEq` C8.pack "close")
- $ writeItr itr itrWillClose True
-
- willClose <- readItr itr itrWillClose id
- when willClose
- $ updateRes $! setHeader (C8.pack "Connection") (C8.pack "close")
-
- when (reqMethod req == HEAD || not canHaveBody)
- $ writeTVar (itrWillDiscardBody itr) True
-
- readHeader :: Strict.ByteString -> STM (Maybe Strict.ByteString)
- readHeader !name
- = readItr itr itrResponse $ getHeader name
-
- updateRes :: (Response -> Response) -> STM ()
- updateRes !updator
- = updateItr itr itrResponse updator
-
-
-completeUnconditionalHeaders :: Config -> Response -> IO Response
-completeUnconditionalHeaders !conf !res
- = compServer res >>= compDate
- where
- compServer res'
- = case getHeader (C8.pack "Server") res' of
- Nothing -> return $ setHeader (C8.pack "Server") (cnfServerSoftware conf) res'
- Just _ -> return res'
-
- compDate res'
- = case getHeader (C8.pack "Date") res' of
- Nothing -> do date <- getCurrentDate
- return $ setHeader (C8.pack "Date") date res'
- Just _ -> return res'
-
-
-cache :: IORef (UTCTime, Strict.ByteString)
-cache = unsafePerformIO $
- newIORef (UTCTime (ModifiedJulianDay 0) 0, undefined)
-{-# NOINLINE cache #-}
-
-getCurrentDate :: IO Strict.ByteString
-getCurrentDate = do now <- getCurrentTime
- (cachedTime, cachedStr) <- readIORef cache
-
- if now `mostlyEq` cachedTime then
- return cachedStr
- else
- do let dateStr = C8.pack $ HTTP.format now
- writeIORef cache (now, dateStr)
- return dateStr
+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
- mostlyEq :: UTCTime -> UTCTime -> Bool
- mostlyEq a b
- = (utctDay a == utctDay b)
- &&
- (fromEnum (utctDayTime a) == fromEnum (utctDayTime b))
+ 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