X-Git-Url: http://git.cielonegro.org/gitweb.cgi?p=Lucu.git;a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FPostprocess.hs;h=39b6b4c16f24ff608c12f1c59780225682915b91;hp=732c47a809002e39e08e522f2b5681e508b9143b;hb=72a3e24;hpb=895341e8b790e969be678c5cfb85c878e321c8fc

diff --git a/Network/HTTP/Lucu/Postprocess.hs b/Network/HTTP/Lucu/Postprocess.hs
index 732c47a..39b6b4c 100644
--- a/Network/HTTP/Lucu/Postprocess.hs
+++ b/Network/HTTP/Lucu/Postprocess.hs
@@ -9,11 +9,12 @@ module Network.HTTP.Lucu.Postprocess
     , completeUnconditionalHeaders
     )
     where
+import qualified Blaze.ByteString.Builder.Char.Utf8 as BB
 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 Data.Monoid.Unicode
 import Data.Time
@@ -21,6 +22,7 @@ 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
@@ -28,137 +30,119 @@ import Network.HTTP.Lucu.Request
 import Network.HTTP.Lucu.Response
 import Prelude.Unicode
 
-{-
-  TODO: Tanslate this memo into English. It doesn't make sense to
-  non-Japanese speakers.
-  
-  * 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 (Interaction {..})
-    = do res  ← readTVar itrResponse
-         let sc = resStatus res
-
-         unless (any (\ p → p sc) [isSuccessful, isRedirection, isError])
-             $ abortSTM InternalServerError []
-             $ Just
-             $ A.toText
-             $ A.fromAsciiBuilder
-             $ A.toAsciiBuilder "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
-             $ A.fromAsciiBuilder
-             $ A.toAsciiBuilder "The status was "
-             ⊕ printStatusCode sc
-             ⊕ A.toAsciiBuilder " but no Allow header."
-
-         when (sc ≢ NotModified ∧ isRedirection sc ∧ getHeader "Location" res ≡ Nothing)
-             $ abortSTM InternalServerError []
-             $ Just
-             $ A.toText
-             $ A.fromAsciiBuilder
-             $ A.toAsciiBuilder "The status code was "
-             ⊕ printStatusCode sc
-             ⊕ A.toAsciiBuilder " but no Location header."
+postprocess itr@(Interaction {..})
+    = do abortOnCertainConditions itr
+         writeDefaultPageIfNeeded itr
 
          case itrRequest of
-           Just req → postprocessWithRequest sc req
+           Just req → postprocessWithRequest itr req
            Nothing  → return ()
 
-         -- 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 ← readTVar itrResponse
-            newRes ← unsafeIOToSTM
-                     $ completeUnconditionalHeaders itrConfig oldRes
-            writeTVar itrResponse newRes
+         updateResIO itr $ completeUnconditionalHeaders itrConfig
+
+abortOnCertainConditions ∷ Interaction → STM ()
+abortOnCertainConditions (Interaction {..})
+    = readTVar itrResponse ≫= go
     where
-      postprocessWithRequest ∷ StatusCode → Request → STM ()
-      postprocessWithRequest sc (Request {..})
-          = do let canHaveBody = if reqMethod ≡ HEAD then
-                                     False
-                                 else
-                                     (¬) (isInformational sc ∨
-                                          sc ≡ NoContent     ∨
-                                          sc ≡ ResetContent  ∨
-                                          sc ≡ 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 (reqVersion ≡ HttpVersion 1 1)
-                       $ do updateRes $ setHeader "Transfer-Encoding" "chunked"
-                            writeTVar itrWillChunkBody True
-               else
-                   -- body 関連のヘッダを削除。但し HEAD なら Content-* は殘す
-                   when (reqMethod ≢ HEAD)
-                       $ do updateRes $ deleteHeader "Content-Type"
-                            updateRes $ deleteHeader "Etag"
-                            updateRes $ deleteHeader "Last-Modified"
-
-               conn ← readCIHeader "Connection"
-               case conn of
-                 Nothing    → return ()
-                 Just value → when (value ≡ "close")
-                                  $ writeTVar itrWillClose True
-
-               willClose ← readTVar itrWillClose
-               when willClose
-                   $ updateRes $ setHeader "Connection" "close"
-
-               when (reqMethod ≡ HEAD ∨ not canHaveBody)
-                   $ writeTVar itrWillDiscardBody True
-
-      readHeader ∷ CIAscii → STM (Maybe Ascii)
-      {-# INLINE readHeader #-}
-      readHeader k = getHeader k <$> readTVar itrResponse
-
-      readCIHeader ∷ CIAscii → STM (Maybe CIAscii)
-      {-# INLINE readCIHeader #-}
-      readCIHeader k = getCIHeader k <$> readTVar itrResponse
-
-      updateRes ∷ (Response → Response) → STM ()
-      {-# INLINE updateRes #-}
-      updateRes f
-          = do old ← readTVar itrResponse
-               writeTVar itrResponse (f old)
+      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)
+                  res ← readTVar itrResponse
+                  let page = getDefaultPage itrConfig itrRequest res
+                  putTMVar itrBodyToSend (BB.fromLazyText 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