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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE TemplateHaskell #-}
module Authentication (User, queryUser) where
import Data.Aeson
import Data.Maybe
import Data.Either.Extra
import GHC.Generics
import Network.HTTP.Conduit
import Data.ByteString.Lazy.Char8 (unpack)
import Control.Exception
import Control.Monad.Trans
import Control.Monad.Trans.Either
import Control.Concurrent.MVar
makeUrl = ("https://www.googleapis.com/oauth2/v3/tokeninfo?id_token="++)
type Token = String
data User = User
{ email :: String
, name :: String
} deriving (Eq, Show, Generic)
instance FromJSON User
queryUser :: Token -> IO (Maybe User)
queryUser token = (queryUser' token) `catch` \e -> do
print (e :: HttpException)
return Nothing
queryUser' token = do
response <- simpleHttp (makeUrl token)
return (decode response)
isAuthenticated :: [[String]] -> MVar [Token] -> Token -> IO Bool
isAuthenticated allowedUsers tokenCache token = runEitherT f >>= return . fromEither
where f :: EitherT Bool IO Bool
f = do
ts <- lift $ readMVar tokenCache
_ <- test (token `elem` ts)
user <- lift $ queryUser token
return False
test False = return ()
test True = left True
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