116 lines
4.6 KiB
Haskell
116 lines
4.6 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RankNTypes #-}
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module Yesod.Core.Internal.Response where
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import Data.ByteString (ByteString)
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import qualified Data.ByteString as S
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import qualified Data.ByteString.Char8 as S8
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import Data.CaseInsensitive (CI)
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import qualified Data.CaseInsensitive as CI
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import Network.Wai
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import Control.Monad (mplus)
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import Control.Monad.Trans.Resource (runInternalState, InternalState)
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import Network.Wai.Internal
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import Web.Cookie (renderSetCookie)
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import Yesod.Core.Content
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import Yesod.Core.Types
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import qualified Network.HTTP.Types as H
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import qualified Data.Text as T
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import Control.Exception (SomeException, handle)
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import Blaze.ByteString.Builder (fromLazyByteString,
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toLazyByteString, toByteString)
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Map as Map
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import Yesod.Core.Internal.Request (tokenKey)
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import Data.Text.Encoding (encodeUtf8)
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import Data.Conduit (Flush (..), ($$), transPipe)
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import qualified Data.Conduit.List as CL
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yarToResponse :: YesodResponse
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-> (SessionMap -> IO [Header]) -- ^ save session
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-> YesodRequest
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-> Request
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-> InternalState
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-> (Response -> IO ResponseReceived)
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-> IO ResponseReceived
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yarToResponse (YRWai a) _ _ _ _ sendResponse = sendResponse a
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yarToResponse (YRWaiApp app) _ _ req _ sendResponse = app req sendResponse
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yarToResponse (YRPlain s' hs ct c newSess) saveSession yreq _req is sendResponse = do
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extraHeaders <- do
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let nsToken = maybe
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newSess
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(\n -> Map.insert tokenKey (encodeUtf8 n) newSess)
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(reqToken yreq)
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sessionHeaders <- saveSession nsToken
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return $ ("Content-Type", ct) : map headerToPair sessionHeaders
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let finalHeaders = extraHeaders ++ map headerToPair hs
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finalHeaders' len = ("Content-Length", S8.pack $ show len)
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: finalHeaders
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let go (ContentBuilder b mlen) = do
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let hs' = maybe finalHeaders finalHeaders' mlen
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sendResponse $ ResponseBuilder s hs' b
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go (ContentFile fp p) = sendResponse $ ResponseFile s finalHeaders fp p
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go (ContentSource body) = sendResponse $ responseStream s finalHeaders
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$ \sendChunk flush ->
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transPipe (`runInternalState` is) body
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$$ CL.mapM_ (\mchunk ->
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case mchunk of
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Flush -> flush
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Chunk builder -> sendChunk builder)
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go (ContentDontEvaluate c') = go c'
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go c
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where
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s
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| s' == defaultStatus = H.status200
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| otherwise = s'
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-- | Indicates that the user provided no specific status code to be used, and
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-- therefore the default status code should be used. For normal responses, this
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-- would be a 200 response, whereas for error responses this would be an
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-- appropriate status code.
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--
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-- For more information on motivation for this, see:
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--
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-- https://groups.google.com/d/msg/yesodweb/vHDBzyu28TM/bezCvviWp4sJ
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--
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-- Since 1.2.3.1
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defaultStatus :: H.Status
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defaultStatus = H.mkStatus (-1) "INVALID DEFAULT STATUS"
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-- | Convert Header to a key/value pair.
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headerToPair :: Header
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-> (CI ByteString, ByteString)
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headerToPair (AddCookie sc) =
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("Set-Cookie", toByteString $ renderSetCookie sc)
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headerToPair (DeleteCookie key path) =
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( "Set-Cookie"
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, S.concat
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[ key
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, "=; path="
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, path
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, "; expires=Thu, 01-Jan-1970 00:00:00 GMT"
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]
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)
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headerToPair (Header key value) = (CI.mk key, value)
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evaluateContent :: Content -> IO (Either ErrorResponse Content)
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evaluateContent (ContentBuilder b mlen) = handle f $ do
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let lbs = toLazyByteString b
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len = L.length lbs
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mlen' = mlen `mplus` Just (fromIntegral len)
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len `seq` return (Right $ ContentBuilder (fromLazyByteString lbs) mlen')
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where
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f :: SomeException -> IO (Either ErrorResponse Content)
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f = return . Left . InternalError . T.pack . show
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evaluateContent c = return (Right c)
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getStatus :: ErrorResponse -> H.Status
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getStatus NotFound = H.status404
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getStatus (InternalError _) = H.status500
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getStatus (InvalidArgs _) = H.status400
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getStatus NotAuthenticated = H.status401
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getStatus (PermissionDenied _) = H.status403
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getStatus (BadMethod _) = H.status405
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