{-# LANGUAGE
- BangPatterns
- , DoAndIfThenElse
+ DoAndIfThenElse
, OverloadedStrings
+ , RecordWildCards
, UnicodeSyntax
#-}
module Network.HTTP.Lucu.Postprocess
import Control.Concurrent.STM
import Control.Monad
import Control.Monad.Unicode
-import Data.Ascii (Ascii, CIAscii)
+import Data.Ascii (Ascii, CIAscii, AsciiBuilder)
import qualified Data.Ascii as A
-import Data.Maybe
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.Response
import Prelude.Unicode
-{-
-
- * 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。
+postprocess ∷ Interaction → STM ()
+postprocess itr@(Interaction {..})
+ = do abortOnCertainConditions itr
- * Date が無ければ設定。
+ case itrRequest of
+ Just req → postprocessWithRequest itr req
+ Nothing → return ()
--}
+ updateResIO itr $ completeUnconditionalHeaders itrConfig
-postprocess ∷ Interaction → STM ()
-postprocess !itr
- = do reqM ← readItr itrRequest id itr
- res ← readItr itrResponse id itr
- let sc = resStatus res
-
- unless (any (\ p → p sc) [isSuccessful, isRedirection, isError])
- $ abortSTM InternalServerError []
- $ Just
- $ A.toText ( "The status code is not good for a final status of a response: "
- ⊕ printStatusCode sc )
-
- when (sc ≡ MethodNotAllowed ∧ getHeader "Allow" res ≡ Nothing)
- $ abortSTM InternalServerError []
- $ Just
- $ A.toText ( "The status was "
- ⊕ printStatusCode sc
- ⊕ " but no Allow header." )
-
- when (sc ≢ NotModified ∧ isRedirection sc ∧ getHeader "Location" res ≡ Nothing)
- $ abortSTM InternalServerError []
- $ Just
- $ A.toText ( "The status code was "
- ⊕ printStatusCode 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 itrResponse id itr
- newRes ← unsafeIOToSTM
- $ completeUnconditionalHeaders (itrConfig itr) oldRes
- writeItr itrResponse newRes itr
+abortOnCertainConditions ∷ Interaction → STM ()
+abortOnCertainConditions (Interaction {..})
+ = readTVar itrResponse ≫= go
where
- relyOnRequest ∷ STM ()
- relyOnRequest
- = do status ← readItr itrResponse resStatus itr
- req ← readItr itrRequest fromJust itr
-
- let reqVer = reqVersion req
- canHaveBody = if reqMethod req ≡ HEAD then
- False
- else
- not (isInformational status ∨
- status ≡ NoContent ∨
- status ≡ ResetContent ∨
- status ≡ NotModified )
-
- updateRes $ deleteHeader "Content-Length"
- updateRes $ deleteHeader "Transfer-Encoding"
-
- cType ← readHeader "Content-Type"
- when (cType ≡ Nothing)
- $ updateRes $ setHeader "Content-Type" defaultPageContentType
-
- if canHaveBody then
- when (reqVer ≡ HttpVersion 1 1)
- $ do updateRes $ setHeader "Transfer-Encoding" "chunked"
- writeItr itrWillChunkBody True itr
- 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 "Content-Type"
- updateRes $ deleteHeader "Etag"
- updateRes $ deleteHeader "Last-Modified"
-
- conn ← readHeader "Connection"
- case conn of
- Nothing → return ()
- Just value → when (A.toCIAscii value ≡ "close")
- $ writeItr itrWillClose True itr
-
- willClose ← readItr itrWillClose id itr
- when willClose
- $ updateRes $ setHeader "Connection" "close"
-
- when (reqMethod req ≡ HEAD ∨ not canHaveBody)
- $ writeTVar (itrWillDiscardBody itr) True
-
- readHeader ∷ CIAscii → STM (Maybe Ascii)
- {-# INLINE readHeader #-}
- readHeader k = readItr itrResponse (getHeader k) itr
-
- updateRes ∷ (Response → Response) → STM ()
- {-# INLINE updateRes #-}
- updateRes f = updateItr itrResponse f itr
+ 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
projects / Lucu.git / blobdiff