+{-# LANGUAGE
+ BangPatterns
+ , UnicodeSyntax
+ #-}
module Network.HTTP.Lucu.Postprocess
- ( postprocess -- Interaction -> STM ()
- , completeUnconditionalHeaders -- Response -> IO Response
+ ( postprocess
+ , completeUnconditionalHeaders
)
where
import Control.Concurrent.STM
import Control.Monad
-import Data.Char
+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.RFC1123DateTime
import Network.HTTP.Lucu.Request
import Network.HTTP.Lucu.Response
-import Network.HTTP.Lucu.Utils
-import System.Time
+import System.IO.Unsafe
{-
- * Response が未設定なら、HTTP/1.1 500 Internal Server Error にする。
+ * Response が未設定なら、200 OK にする。
- * Content-Length があれば、それを削除する。
+ * ステータスが 2xx, 3xx, 4xx, 5xx のいずれでもなければ 500 にする。
- * 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。
+ * 405 Method Not Allowed なのに Allow ヘッダが無ければ 500 にする。
- * 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。
+ * 304 Not Modified 以外の 3xx なのに Location ヘッダが無ければ 500 に
+ する。
- * 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。
+ * 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。
-}
-{- 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
+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 itr
- = do resM <- readTVar (itrResponse itr)
+ relyOnRequest :: STM ()
+ relyOnRequest
+ = do status <- readItr itr itrResponse resStatus
+ req <- readItr itr itrRequest fromJust
- let req = fromJust $ itrRequest itr
- reqVer = reqVersion req
- res = fromJust resM
- status = resStatus res
+ let reqVer = reqVersion req
canHaveBody = if reqMethod req == HEAD then
False
else
- isInformational status ||
- status == NoContent ||
- status == ResetContent ||
- status == NotModified
+ not (isInformational status ||
+ status == NoContent ||
+ status == ResetContent ||
+ status == NotModified )
+
+ updateRes $! deleteHeader (C8.pack "Content-Length")
+ updateRes $! deleteHeader (C8.pack "Transfer-Encoding")
- setRes itr (deleteHeader res "Content-Length")
+ cType <- readHeader (C8.pack "Content-Type")
+ when (cType == Nothing)
+ $ updateRes $ setHeader (C8.pack "Content-Type") defaultPageContentType
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")
+ 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
- do setRes itr (deleteHeader res "Transfer-Encoding")
- when (reqMethod req /= HEAD)
- $ setRes itr (deleteHeader res "Content-Type")
+ when (reqMethod req /= HEAD)
+ $ do updateRes $! deleteHeader (C8.pack "Content-Type")
+ updateRes $! deleteHeader (C8.pack "Etag")
+ updateRes $! deleteHeader (C8.pack "Last-Modified")
- if fmap (map toLower) (getHeader res "Connection") == Just "close" then
- writeTVar (itrWillClose itr) True
- else
- setRes itr (setHeader res "Connection" "close")
+ 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
- setStatus itr status
- = writeTVar (itrResponse itr) (Just $ Response {
- resVersion = HttpVersion 1 1
- , resStatus = status
- , resHeaders = []
- })
+ readHeader :: Strict.ByteString -> STM (Maybe Strict.ByteString)
+ readHeader !name
+ = readItr itr itrResponse $ getHeader name
- setRes itr res
- = writeTVar (itrResponse itr) (Just res)
+ updateRes :: (Response -> Response) -> STM ()
+ updateRes !updator
+ = updateItr itr itrResponse updator
-completeUnconditionalHeaders :: Response -> IO Response
-completeUnconditionalHeaders res
- = return res >>= compServer >>= compDate >>= return
+completeUnconditionalHeaders :: Config -> Response -> IO Response
+completeUnconditionalHeaders !conf !res
+ = compServer res >>= compDate
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
+ 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
+ where
+ mostlyEq :: UTCTime -> UTCTime -> Bool
+ mostlyEq a b
+ = (utctDay a == utctDay b)
+ &&
+ (fromEnum (utctDayTime a) == fromEnum (utctDayTime b))
projects / Lucu.git / blobdiff