module Network.HTTP.Lucu.Postprocess
( postprocess -- Interaction -> STM ()
- , completeUnconditionalHeaders -- Response -> IO Response
+ , completeUnconditionalHeaders -- Config -> Response -> IO Response
)
where
import Data.Char
import Data.Maybe
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
{-
- * 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。
+
+ * 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。
* 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。
+ 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。
-}
-{- 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
+ = do resM <- readItr itr itrResponse id
+
+ case resM of
+ Nothing -> writeItr itr itrResponse
+ $ Just $ Response {
+ resVersion = HttpVersion 1 1
+ , resStatus = Ok
+ , resHeaders = []
+ }
+ Just res -> do let sc = resStatus res
+
+ when (not $ any (\ p -> p sc) [isSuccessful, isRedirection, isError])
+ $ abortSTM InternalServerError []
+ ("The status code is not good for a final status: "
+ ++ show sc)
+
+ when (sc == MethodNotAllowed && getHeader "Allow" res == Nothing)
+ $ abortSTM InternalServerError []
+ ("The status was " ++ show sc ++ " but no Allow header.")
+
+ when (sc /= NotModified && isRedirection sc && getHeader "Location" res == Nothing)
+ $ abortSTM InternalServerError []
+ ("The status code was " ++ show sc ++ " but no Location header.")
when (itrRequest itr /= Nothing)
$ relyOnRequest itr
- do oldRes <- readTVar (itrResponse itr)
- newRes <- unsafeIOToSTM $ completeUnconditionalHeaders $ fromJust oldRes
- setRes itr newRes
+ do oldRes <- readItr itr itrResponse id
+ newRes <- unsafeIOToSTM
+ $ completeUnconditionalHeaders (itrConfig itr) (fromJust oldRes)
+ writeItr itr itrResponse $ Just newRes
where
+ relyOnRequest :: Interaction -> STM ()
relyOnRequest itr
- = do resM <- readTVar (itrResponse itr)
+ = do status <- readItr itr itrResponse (resStatus . fromJust)
let req = fromJust $ itrRequest itr
reqVer = reqVersion req
- res = fromJust resM
- status = resStatus res
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 itr $ deleteHeader "Content-Length"
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
+ do teM <- readHeader itr "Transfer-Encoding"
+ if reqVer == HttpVersion 1 1 then
+
+ do case teM of
+ Nothing -> updateRes itr $ setHeader "Transfer-Encoding" "chunked"
+ Just te -> let teList = [trim isWhiteSpace x
+ | x <- splitBy (== ',') (map toLower te)]
+ in
+ when (teList == [] || last teList /= "chunked")
+ $ abortSTM InternalServerError []
+ ("Transfer-Encoding must end with `chunked' "
+ ++ "because this is an HTTP/1.1 request: "
+ ++ te)
+
+ writeItr itr itrWillChunkBody True
else
- case getHeader res "Transfer-Encoding" of
+ case fmap (map toLower) teM of
Nothing -> return ()
Just "identity" -> return ()
- _ -> setStatus itr InternalServerError
-
- when (getHeader res "Content-Type" == Nothing)
- $ setRes itr (setHeader res "Content-Type" "application/octet-stream")
+ Just te -> abortSTM InternalServerError []
+ ("Transfer-Encoding must be `identity' because "
+ ++ "this is an HTTP/1.0 request: "
+ ++ te)
+
+ cType <- readHeader itr "Content-Type"
+ when (cType == Nothing)
+ $ updateRes itr $ setHeader "Content-Type" "application/octet-stream"
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")
+ do updateRes itr $ deleteHeader "Transfer-Encoding"
when (reqMethod req /= HEAD)
- $ setRes itr (deleteHeader res "Content-Type")
+ $ do updateRes itr $ deleteHeader "Content-Type"
+ updateRes itr $ deleteHeader "Etag"
+ updateRes itr $ deleteHeader "Last-Modified"
- if fmap (map toLower) (getHeader res "Connection") == Just "close" then
- writeTVar (itrWillClose itr) True
- else
- setRes itr (setHeader res "Connection" "close")
+ conn <- readHeader itr "Connection"
+ case fmap (map toLower) conn of
+ Just "close" -> writeItr itr itrWillClose True
+ _ -> return ()
+
+ willClose <- readItr itr itrWillClose id
+ when willClose
+ $ updateRes itr $ setHeader "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 = []
- })
+ readHeader :: Interaction -> String -> STM (Maybe String)
+ readHeader itr name
+ = do valueMM <- readItrF itr itrResponse $ getHeader name
+ case valueMM of
+ Just (Just val) -> return $ Just val
+ _ -> return Nothing
- setRes itr res
- = writeTVar (itrResponse itr) (Just res)
+ updateRes :: Interaction -> (Response -> Response) -> STM ()
+ updateRes itr updator
+ = updateItrF itr itrResponse updator
-completeUnconditionalHeaders :: Response -> IO Response
-completeUnconditionalHeaders res
+completeUnconditionalHeaders :: Config -> Response -> IO Response
+completeUnconditionalHeaders conf res
= return res >>= compServer >>= compDate >>= return
where
compServer res
- = case getHeader res "Server" of
- Nothing -> return $ addHeader res "Server" "Lucu/1.0"
+ = case getHeader "Server" res of
+ Nothing -> return $ addHeader "Server" (cnfServerSoftware conf) res
Just _ -> return res
compDate res
- = case getHeader res "Date" of
+ = case getHeader "Date" res of
Nothing -> do time <- getClockTime
- return $ addHeader res "Date" $ formatHTTPDateTime time
+ return $ addHeader "Date" (formatHTTPDateTime time) res
Just _ -> return res
\ No newline at end of file
projects / Lucu.git / blobdiff