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{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE TypeSynonymInstances #-}
{-# LANGUAGE UndecidableInstances #-}
{-|
Module : Crypto.Macaroon.Verifier
Copyright : (c) 2015 Julien Tanguy
License : BSD3
Maintainer : julien.tanguy@jhome.fr
Stability : experimental
Portability : portable
-}
module Crypto.Macaroon.Verifier (
verify
, ValidationError(ValidatorError, ParseError)
-- , (.<), (.<=), (.==), (.>), (.>=)
-- , module Data.Attoparsec.ByteString.Char8
) where
import Control.Applicative
import Control.Monad hiding (forM)
import Control.Monad.IO.Class
import Data.Attoparsec.ByteString
import Data.Attoparsec.ByteString.Char8
import Data.Bool
import Data.Traversable
import qualified Data.ByteString as BS
import Data.Either.Combinators
import Crypto.Macaroon.Internal
import Crypto.Macaroon.Verifier.Internal
-- (.<) :: (MonadIO m, Ord a, Parsable a) => Key -> m a -> Caveat -> m (Maybe (Either ValidationError Caveat))
-- (.<) = verifyOpBool "Greater or equal" (<) "<"
-- (.<=) :: (MonadIO m, Ord a, Parsable a) => Key -> m a -> Caveat -> m (Maybe (Either ValidationError Caveat))
-- (.<=) = verifyOpBool "Strictly greater" (<=) "<="
-- (.==) :: (MonadIO m, Eq a, Parsable a) => Key -> m a -> Caveat -> m (Maybe (Either ValidationError Caveat))
-- (.==) = verifyOpBool "Not equal" (==) "="
-- (.>) :: (MonadIO m, Ord a, Parsable a) => Key -> m a -> Caveat -> m (Maybe (Either ValidationError Caveat))
-- (.>) = verifyOpBool "Less or equal" (>) ">"
-- (.>=) :: (MonadIO m, Ord a, Parsable a) => Key -> m a -> Caveat -> m (Maybe (Either ValidationError Caveat))
-- (.>=) = verifyOpBool "Strictly less" (>=) ">="
-- | Verify a Macaroon's signature and caveats, given the corresponding Secret
-- and verifiers.
--
-- A verifier is a function of type
-- @'MonadIO' m => 'Caveat' -> m ('Maybe' ('Either' 'ValidatorError' 'Caveat'))@.
--
-- It should return:
--
-- * 'Nothing' if the caveat is not related to the verifier
-- (for instance a time verifier is given an action caveat);
-- * 'Just' ('Left' ('ParseError' reason)) if the verifier is related to the
-- caveat, but failed to parse it completely;
-- * 'Just' ('Left' ('ValidatorError' reason)) if the verifier is related to the
-- caveat, parsed it and invalidated it;
-- * 'Just' ('Right' '()') if the verifier has successfully verified the
-- given caveat
verify :: (Functor m, MonadIO m) => Secret -> [Caveat -> m (Maybe (Either ValidationError ()))] -> Macaroon -> m (Either ValidationError Macaroon)
verify secret verifiers m = join <$> forM (verifySig secret m) (verifyCavs verifiers)
-- verifyOpBool :: MonadIO m => String -> Parser a -> (a -> a -> Bool) -> BS.ByteString -> Key -> m a -> Caveat -> m (Maybe (Either ValidationError Caveat))
-- verifyOpBool err p f op k val = verifyParser k valueParser $ \s -> do
-- expected <- val
-- return $ bool (Left $ ValidatorError err) (Right Win) =<< f expected <$> mapLeft ParseError (parseOnly p s)
-- where
-- valueParser = string op *> skipSpace *> takeByteString
-- verifyParser :: (MonadIO m) => Key -> Parser a -> (a -> m (Either ValidationError Win)) -> Caveat -> m (Maybe (Either ValidationError Caveat))
-- verifyParser k p f c = case parseOnly keyParser . cid $ c of
-- Left _ -> return Nothing
-- Right bs -> Just <$> case parseOnly p bs of
-- Left err -> return $ Left $ ParseError err
-- Right a -> fmap (const c) <$> f a
-- where
-- keyParser = string k *> skipSpace *> takeByteString
|
