1 module Network.HTTP.Lucu.Postprocess
2 ( postprocess -- Interaction -> STM ()
3 , completeUnconditionalHeaders -- Response -> IO Response
7 import Control.Concurrent.STM
11 import GHC.Conc (unsafeIOToSTM)
12 import Network.HTTP.Lucu.Headers
13 import Network.HTTP.Lucu.HttpVersion
14 import Network.HTTP.Lucu.Interaction
15 import Network.HTTP.Lucu.RFC1123DateTime
16 import Network.HTTP.Lucu.Request
17 import Network.HTTP.Lucu.Response
18 import Network.HTTP.Lucu.Utils
23 * Response が未設定なら、HTTP/1.1 500 Internal Server Error にする。
25 * Content-Length があれば、それを削除する。
27 * HTTP/1.1 であり、且つ body を持つ事が出來る時、Transfer-Encoding の
28 最後の要素が chunked でなければ 500 Internal Error にする。
29 Transfer-Encoding が未設定であれば、chunked に設定する。
31 * HTTP/1.0 なのに Transfer-Encoding が設定濟なら 500 Internal Server
32 Error にする。但し identity だけは許す。
34 * body を持つ事が出來る時、Content-Type が無ければ
35 application/octet-stream にする。出來ない時、HEAD でなければ
38 * body を持つ事が出來ない時、body 破棄フラグを立てる。
40 * Connection: close が設定されてゐる時、切斷フラグを立てる。
42 * 切斷フラグが立ってゐる時、Connection: close を設定する。
50 {- Postprocess は body を補完した後で實行する事 -}
52 postprocess :: Interaction -> STM ()
54 = do res <- readTVar (itrResponse itr)
57 $ setStatus itr InternalServerError
59 when (itrRequest itr /= Nothing)
62 do oldRes <- readTVar (itrResponse itr)
63 newRes <- unsafeIOToSTM $ completeUnconditionalHeaders $ fromJust oldRes
67 = do resM <- readTVar (itrResponse itr)
69 let req = fromJust $ itrRequest itr
70 reqVer = reqVersion req
72 status = resStatus res
73 canHaveBody = if reqMethod req == HEAD then
76 isInformational status ||
77 status == NoContent ||
78 status == ResetContent ||
81 setRes itr (deleteHeader res "Content-Length")
84 do if reqVer == HttpVersion 1 1 then
86 case getHeader res "Transfer-Encoding" of
87 Nothing -> setRes itr (setHeader res "Transfer-Encoding" "chunked")
88 Just te -> let teList = [trim isWhiteSpace x
89 | x <- splitBy (== ',') (map toLower te)]
91 when (teList == [] || last teList /= "chunked")
92 $ setStatus itr InternalServerError
94 case getHeader res "Transfer-Encoding" of
96 Just "identity" -> return ()
97 _ -> setStatus itr InternalServerError
99 when (getHeader res "Content-Type" == Nothing)
100 $ setRes itr (setHeader res "Content-Type" "application/octet-stream")
102 -- body 関連のヘッダを削除。但し HEAD なら Content-* は殘す
103 do setRes itr (deleteHeader res "Transfer-Encoding")
104 when (reqMethod req /= HEAD)
105 $ setRes itr (deleteHeader res "Content-Type")
107 if fmap (map toLower) (getHeader res "Connection") == Just "close" then
108 writeTVar (itrWillClose itr) True
110 setRes itr (setHeader res "Connection" "close")
112 when (reqMethod req == HEAD || not canHaveBody)
113 $ writeTVar (itrWillDiscardBody itr) True
116 = writeTVar (itrResponse itr) (Just $ Response {
117 resVersion = HttpVersion 1 1
123 = writeTVar (itrResponse itr) (Just res)
126 completeUnconditionalHeaders :: Response -> IO Response
127 completeUnconditionalHeaders res
128 = return res >>= compServer >>= compDate >>= return
131 = case getHeader res "Server" of
132 Nothing -> return $ addHeader res "Server" "Lucu/1.0"
136 = case getHeader res "Date" of
137 Nothing -> do time <- getClockTime
138 return $ addHeader res "Date" $ formatHTTPDateTime time