X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FPostprocess.hs;h=131cc8ebb3e65f7426a3bf245cc14185a1502795;hb=1f0a19cbad7c4b64a773d7f1c1ae9180448624e6;hp=ca416b9f4dc24b96cf5f206554c7d4a8bf212100;hpb=54778963482bef9f6dfc305e593658e0e9d1a4c5;p=Lucu.git

diff --git a/Network/HTTP/Lucu/Postprocess.hs b/Network/HTTP/Lucu/Postprocess.hs
index ca416b9..131cc8e 100644
--- a/Network/HTTP/Lucu/Postprocess.hs
+++ b/Network/HTTP/Lucu/Postprocess.hs
@@ -1,6 +1,7 @@
 {-# LANGUAGE
-    BangPatterns
+    DoAndIfThenElse
   , OverloadedStrings
+  , RecordWildCards
   , UnicodeSyntax
   #-}
 module Network.HTTP.Lucu.Postprocess
@@ -12,138 +13,135 @@ import Control.Applicative
 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 qualified Data.ByteString as Strict (ByteString)
-import qualified Data.ByteString.Char8 as C8 hiding (ByteString)
-import Data.IORef
-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.Request
 import Network.HTTP.Lucu.Response
 import Prelude.Unicode
-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。
+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 itr itrRequest id
-         res  ← readItr itr itrResponse id
-         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 ("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
+abortOnCertainConditions ∷ Interaction → STM ()
+abortOnCertainConditions (Interaction {..})
+    = readTVar itrResponse ≫= go
     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 "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 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 "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 itr itrWillClose True
-
-               willClose ← readItr itr itrWillClose id
-               when willClose
-                        $ updateRes $ setHeader "Connection" "close"
-
-               when (reqMethod req ≡ HEAD ∨ not canHaveBody)
-                        $ writeTVar (itrWillDiscardBody itr) True
-
-      readHeader ∷ CIAscii → STM (Maybe Ascii)
-      readHeader = readItr itr itrResponse ∘ getHeader
-
-      updateRes ∷ (Response → Response) → STM ()
-      updateRes = updateItr itr itrResponse
+      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
@@ -160,4 +158,4 @@ completeUnconditionalHeaders conf = (compDate =≪) ∘ compServer
                 Just _  → return res'
 
 getCurrentDate ∷ IO Ascii
-getCurrentDate = HTTP.format <$> getCurrentTime
+getCurrentDate = HTTP.toAscii <$> getCurrentTime