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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE TemplateHaskell #-}
module Authentication (User, queryUser, isAuthenticated) 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
, aud :: 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] -> [String] -> MVar [Token] -> Token -> IO Bool
isAuthenticated clientIds allowedUsers tokenCache token = runEitherT runner >>= return . fromEither
where runner :: EitherT Bool IO Bool
runner = do
ts <- lift $ readMVar tokenCache
_ <- leftIf (token `elem` ts) True
user <- lift $ queryUser token
email' <- return $ fromMaybe "" (user >>= return . email)
aud' <- return $ fromMaybe "" (user >>= return . aud)
liftIO $ putStrLn $ "Trying to authenticate user: " ++ show user
_ <- leftIf (not (email' `elem` allowedUsers)) False
_ <- leftIf (not (aud' `elem` clientIds)) False
tokens <- lift $ takeMVar tokenCache
lift $ putMVar tokenCache (token:tokens)
return True
leftIf True x = left x
leftIf False x = right x
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