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|
{-# LANGUAGE OverloadedStrings #-}
--------------------------------------------------------------------------------
-- |
-- Module : Text.XRDS
-- Copyright : (c) Trevor Elliott, 2008
-- License : BSD3
--
-- Maintainer : Trevor Elliott <trevor@geekgateway.com>
-- Stability :
-- Portability :
--
module OpenId2.XRDS (
-- * Types
XRDS
, Service(..)
-- * Parsing
, parseXRDS
) where
-- Libraries
import Control.Monad ((>=>))
import Data.Maybe (listToMaybe)
import Text.XML (parseLBS, def)
import Text.XML.Cursor (fromDocument, element, content, ($/), (&|), Cursor, (&/), attribute)
import qualified Data.ByteString.Lazy as L
import Data.Text (Text)
import qualified Data.Text.Read
-- Types -----------------------------------------------------------------------
type XRDS = [XRD]
type XRD = [Service]
data Service = Service
{ serviceTypes :: [Text]
, serviceMediaTypes :: [Text]
, serviceURIs :: [Text]
, serviceLocalIDs :: [Text]
, servicePriority :: Maybe Int
} deriving Show
parseXRDS :: L.ByteString -> Maybe XRDS
parseXRDS str =
either
(const Nothing)
(Just . parseXRDS' . fromDocument)
(parseLBS def str)
parseXRDS' :: Cursor -> [[Service]]
parseXRDS' = element "{xri://$xrds}XRDS" &/
element "{xri://$xrd*($v*2.0)}XRD" &|
parseXRD
parseXRD :: Cursor -> [Service]
parseXRD c = c $/ element "{xri://$xrd*($v*2.0)}Service" >=> parseService
parseService :: Cursor -> [Service]
parseService c =
if null types then [] else [Service
{ serviceTypes = types
, serviceMediaTypes = mtypes
, serviceURIs = uris
, serviceLocalIDs = localids
, servicePriority = listToMaybe (attribute "priority" c) >>= readMaybe
}]
where
types = c $/ element "{xri://$xrd*($v*2.0)}Type" &/ content
mtypes = c $/ element "{xri://$xrd*($v*2.0)}MediaType" &/ content
uris = c $/ element "{xri://$xrd*($v*2.0)}URI" &/ content
localids = c $/ element "{xri://$xrd*($v*2.0)}LocalID" &/ content
readMaybe t =
case Data.Text.Read.signed Data.Text.Read.decimal t of
Right (i, "") -> Just i
_ -> Nothing
|
