X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FPostprocess.hs;h=49c95e809be046489bed306c83db6f77eab12baf;hb=c6847797963abde98faf6aa6425c9bebc0e5dfb5;hp=b7b910f3142ed54caa0078e2a78a35105ec9fe36;hpb=3c7a58ab749a55a30466a033b170536bcdf18b98;p=Lucu.git

diff --git a/Network/HTTP/Lucu/Postprocess.hs b/Network/HTTP/Lucu/Postprocess.hs
index b7b910f..49c95e8 100644
--- a/Network/HTTP/Lucu/Postprocess.hs
+++ b/Network/HTTP/Lucu/Postprocess.hs
@@ -1,39 +1,58 @@
+{-# LANGUAGE
+    BangPatterns
+  , DoAndIfThenElse
+  , OverloadedStrings
+  , 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           Data.Maybe
-import           GHC.Conc (unsafeIOToSTM)
-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 Control.Applicative
+import Control.Concurrent.STM
+import Control.Monad
+import Control.Monad.Unicode
+import Data.Ascii (Ascii, CIAscii)
+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.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、HTTP/1.1 500 Internal Server Error にする。
+  * 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。
 
-  * Content-Length があれば、それを削除する。
+  * 405 Method Not Allowed なのに Allow ヘッダが無ければ 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。
+  * 304 Not Modified 以外の 3xx なのに Location 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。
+  * Content-Length があれば、それを削除する。Transfer-Encoding があって
+    も削除する。
 
-  * 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。
+  * 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。
 
@@ -47,93 +66,107 @@ import           System.Time
 
 -}
 
-{- 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 ∷ 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
+             $ 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 itr itrResponse id
+            newRes ← unsafeIOToSTM
+                     $ completeUnconditionalHeaders (itrConfig itr) oldRes
+            writeItr itr itrResponse newRes
     where
-      relyOnRequest itr
-          = do resM <- readTVar (itrResponse itr)
-
-               let req         = fromJust $ itrRequest itr
-                   reqVer      = reqVersion req
-                   res         = fromJust resM
-                   status      = resStatus res
-                   canHaveBody = if reqMethod req == HEAD then
+      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
-                                     isInformational status ||
-                                     status == NoContent    ||
-                                     status == ResetContent ||
-                                     status == NotModified
+                                     not (isInformational status ∨
+                                          status ≡ NoContent     ∨
+                                          status ≡ ResetContent  ∨
+                                          status ≡ NotModified   )
 
-               setRes itr (deleteHeader res "Content-Length")
+               updateRes $ deleteHeader "Content-Length"
+               updateRes $ deleteHeader "Transfer-Encoding"
+
+               cType ← readHeader "Content-Type"
+               when (cType ≡ Nothing)
+                        $ updateRes $ setHeader "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")
-                 else
+                   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
-                   do setRes itr (deleteHeader res "Transfer-Encoding")
-                      when (reqMethod req /= HEAD)
-                               $ setRes itr (deleteHeader res "Content-Type")
-
-               if fmap (map toLower) (getHeader res "Connection") == Just "close" then
-                   writeTVar (itrWillClose itr) True
-                 else
-                   setRes itr (setHeader res "Connection" "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 = []
-                                                  })
-
-      setRes itr res
-          = writeTVar (itrResponse itr) (Just res)
-
-
-completeUnconditionalHeaders :: Response -> IO Response
-completeUnconditionalHeaders res
-    = return res >>= compServer >>= compDate >>= return
+                   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)
+      {-# INLINE readHeader #-}
+      readHeader = readItr itr itrResponse ∘ getHeader
+
+      updateRes ∷ (Response → Response) → STM ()
+      {-# INLINE updateRes #-}
+      updateRes = updateItr itr itrResponse
+
+completeUnconditionalHeaders ∷ Config → Response → IO Response
+completeUnconditionalHeaders conf = (compDate =≪) ∘ compServer
       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 "Server" res' of
+                Nothing → return $ setHeader "Server" (cnfServerSoftware conf) res'
+                Just _  → return res'
+
+        compDate res'
+            = case getHeader "Date" res' of
+                Nothing → do date ← getCurrentDate
+                             return $ setHeader "Date" date res'
+                Just _  → return res'
+
+getCurrentDate ∷ IO Ascii
+getCurrentDate = HTTP.format <$> getCurrentTime