yesod/Yesod/Response.hs
2009-12-13 01:38:20 +02:00

101 lines
2.3 KiB
Haskell

{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TypeSynonymInstances #-} -- FIXME remove
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE CPP #-}
---------------------------------------------------------
--
-- Module : Yesod.Response
-- Copyright : Michael Snoyman
-- License : BSD3
--
-- Maintainer : Michael Snoyman <michael@snoyman.com>
-- Stability : Stable
-- Portability : portable
--
-- Generating responses.
--
---------------------------------------------------------
module Yesod.Response
( Response (..)
-- * Abnormal responses
, ErrorResult (..)
, getHeaders
, getStatus
-- * Header
, Header (..)
, toPair
#if TEST
-- * Tests
, testSuite
#endif
) where
#if TEST
import Yesod.Rep hiding (testSuite)
#else
import Yesod.Rep
#endif
import Data.Time.Clock
import Web.Encodings (formatW3)
#if TEST
import Test.Framework (testGroup, Test)
#endif
import Data.Generics
import Control.Exception (Exception)
data Response = Response Int [Header] ContentType Content
-- | Abnormal return codes.
data ErrorResult =
Redirect String
| NotFound
| InternalError String
| InvalidArgs [(String, String)]
| PermissionDenied
deriving (Show, Typeable)
instance Exception ErrorResult
getStatus :: ErrorResult -> Int
getStatus (Redirect _) = 303
getStatus NotFound = 404
getStatus (InternalError _) = 500
getStatus (InvalidArgs _) = 400
getStatus PermissionDenied = 403
getHeaders :: ErrorResult -> [Header]
getHeaders (Redirect s) = [Header "Location" s]
getHeaders _ = []
----- header stuff
-- | Headers to be added to a 'Result'.
data Header =
AddCookie Int String String
| DeleteCookie String
| Header String String
-- | Convert Header to a key/value pair.
toPair :: Header -> IO (String, String)
toPair (AddCookie minutes key value) = do
now <- getCurrentTime
let expires = addUTCTime (fromIntegral $ minutes * 60) now
return ("Set-Cookie", key ++ "=" ++ value ++"; path=/; expires="
++ formatW3 expires)
toPair (DeleteCookie key) = return
("Set-Cookie",
key ++ "=; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT")
toPair (Header key value) = return (key, value)
#if TEST
----- Testing
testSuite :: Test
testSuite = testGroup "Yesod.Response"
[
]
#endif