141 lines
4.7 KiB
Haskell
141 lines
4.7 KiB
Haskell
-- | The basic typeclass for a Yesod application.
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module Yesod.Yesod
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( Yesod (..)
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, toHackApp
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) where
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import Yesod.Rep
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import Data.Object.Html (toHtmlObject)
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import Yesod.Response
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import Yesod.Request
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import Yesod.Constants
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import Yesod.Definitions
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import Yesod.Resource
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import Yesod.Handler
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import Control.Monad (when)
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import Data.Maybe (fromMaybe)
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import Data.Convertible.Text
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import Web.Encodings
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import Control.Arrow ((***))
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import qualified Hack
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import Hack.Middleware.CleanPath
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import Hack.Middleware.ClientSession
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import Hack.Middleware.Gzip
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import Hack.Middleware.Jsonp
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import Hack.Middleware.MethodOverride
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type ContentPair = (ContentType, Content)
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class Yesod a where
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handlers ::
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[(ResourcePatternString,
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[(Verb, [ContentType] -> Handler a ContentPair)])]
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-- | The encryption key to be used for encrypting client sessions.
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encryptKey :: a -> IO Word256
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encryptKey _ = getKey defaultKeyFile
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-- | Output error response pages.
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errorHandler :: ErrorResult -> [ContentType] -> Handler a ContentPair
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errorHandler = defaultErrorHandler
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-- | Whether or not we should check for overlapping resource names.
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checkOverlaps :: a -> Bool
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checkOverlaps = const True
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-- | An absolute URL to the root of the application.
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approot :: a -> Approot
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defaultErrorHandler :: Yesod y
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=> ErrorResult
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-> [ContentType]
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-> Handler y ContentPair
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defaultErrorHandler NotFound cts = do
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rr <- askRawRequest
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return $ chooseRep (toHtmlObject $ "Not found: " ++ show rr) cts
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defaultErrorHandler (Redirect url) cts =
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return $ chooseRep (toHtmlObject $ "Redirect to: " ++ url) cts
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defaultErrorHandler PermissionDenied cts =
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return $ chooseRep (toHtmlObject "Permission denied") cts
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defaultErrorHandler (InvalidArgs ia) cts =
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return $ chooseRep (toHtmlObject
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[ ("errorMsg", toHtmlObject "Invalid arguments")
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, ("messages", toHtmlObject ia)
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]) cts
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defaultErrorHandler (InternalError e) cts =
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return $ chooseRep (toHtmlObject
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[ ("Internal server error", e)
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]) cts
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-- | For type signature reasons.
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handlers' :: Yesod y => y ->
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[(ResourcePatternString,
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[(Verb, [ContentType] -> Handler y ContentPair)])]
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handlers' _ = handlers
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toHackApp :: Yesod y => y -> Hack.Application
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toHackApp a env = do
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let patterns = map fst $ handlers' a
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when (checkOverlaps a) $ checkResourceName patterns -- FIXME maybe this should be done compile-time?
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key <- encryptKey a
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let app' = toHackApp' a
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middleware =
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[ gzip
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, cleanPath
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, jsonp
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, methodOverride
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, clientsession [authCookieName] key
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]
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app = foldr ($) app' middleware
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app env
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toHackApp' :: Yesod y => y -> Hack.Application
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toHackApp' y env = do
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let (Right resource) = splitPath $ Hack.pathInfo env
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types = httpAccept env
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(handler, urlParams') = fromMaybe (notFound, []) $ do
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(verbPairs, urlParams'') <- lookupHandlers resource
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let verb = cs $ Hack.requestMethod env
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handler'' <- lookup verb verbPairs
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return (handler'' types, urlParams'')
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rr = envToRawRequest urlParams' env
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runHandler' handler rr y
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httpAccept :: Hack.Env -> [ContentType]
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httpAccept = undefined
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lookupHandlers :: Yesod y
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=> Resource
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-> Maybe
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( [(Verb, [ContentType] -> Handler y ContentPair)]
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, [(ParamName, ParamValue)]
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)
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lookupHandlers = undefined
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runHandler' :: Yesod y
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=> Handler y ContentPair
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-> RawRequest
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-> y
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-> IO Hack.Response
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runHandler' = undefined
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envToRawRequest :: [(ParamName, ParamValue)] -> Hack.Env -> RawRequest
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envToRawRequest urlParams' env =
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let (Right rawPieces) = splitPath $ Hack.pathInfo env
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gets' = decodeUrlPairs $ Hack.queryString env :: [(String, String)]
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clength = fromMaybe "0" $ lookup "Content-Length" $ Hack.http env
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ctype = fromMaybe "" $ lookup "Content-Type" $ Hack.http env
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(posts, files) = map (cs *** cs) *** map (cs *** convertFileInfo)
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$ parsePost ctype clength
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$ Hack.hackInput env
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rawCookie = fromMaybe "" $ lookup "Cookie" $ Hack.http env
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cookies' = decodeCookies rawCookie :: [(String, String)]
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langs = ["en"] -- FIXME
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in RawRequest rawPieces urlParams' gets' posts cookies' files env langs
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convertFileInfo :: ConvertSuccess a b => FileInfo a c -> FileInfo b c
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convertFileInfo (FileInfo a b c) =
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FileInfo (convertSuccess a) (convertSuccess b) c
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