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-- | This module provides an API for resource providers. Resource providers
-- allow Hakyll to get content from resources; the type of resource depends on
-- the concrete instance.
--
module Hakyll.Core.ResourceProvider
( ResourceProvider (..)
, resourceDigest
) where
import Control.Monad ((<=<))
import Data.Word (Word8)
import qualified Data.ByteString.Lazy as LB
import OpenSSL.Digest.ByteString.Lazy (digest)
import OpenSSL.Digest (MessageDigest (MD5))
import Hakyll.Core.Identifier
-- | A value responsible for retrieving and listing resources
--
data ResourceProvider = ResourceProvider
{ -- | A list of all resources this provider is able to provide
resourceList :: [Identifier]
, -- | Retrieve a certain resource as string
resourceString :: Identifier -> IO String
, -- | Retrieve a certain resource as lazy bytestring
resourceLazyByteString :: Identifier -> IO LB.ByteString
}
-- | Retrieve a digest for a given resource
--
resourceDigest :: ResourceProvider -> Identifier -> IO [Word8]
resourceDigest provider = digest MD5 <=< resourceLazyByteString provider
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