60 lines
1.7 KiB
Haskell
60 lines
1.7 KiB
Haskell
{- Remote content identifier logs, pure operations.
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-
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- Copyright 2019 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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{-# LANGUAGE OverloadedStrings #-}
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module Logs.ContentIdentifier.Pure where
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import Annex.Common
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import Logs.UUIDBased
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import Types.Import
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import Utility.Base64
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import qualified Data.ByteString as S
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import qualified Data.ByteString.Char8 as S8
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import qualified Data.ByteString.Lazy as L
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import qualified Data.Attoparsec.ByteString.Lazy as A
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import qualified Data.Attoparsec.ByteString.Char8 as A8
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import Data.ByteString.Builder
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type ContentIdentifierLog = Log [ContentIdentifier]
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buildLog :: ContentIdentifierLog -> Builder
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buildLog = buildLogNew buildContentIdentifierList
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buildContentIdentifierList :: [ContentIdentifier] -> Builder
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buildContentIdentifierList l = case l of
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[] -> mempty
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[c] -> buildcid c
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(c:cs) -> buildcid c <> charUtf8 ':' <> buildContentIdentifierList cs
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where
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buildcid (ContentIdentifier c)
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| S8.any (`elem` [':', '\r', '\n']) c || "!" `S8.isPrefixOf` c =
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charUtf8 '!' <> byteString (toB64' c)
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| otherwise = byteString c
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parseLog :: L.ByteString -> ContentIdentifierLog
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parseLog = parseLogNew parseContentIdentifierList
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parseContentIdentifierList :: A.Parser [ContentIdentifier]
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parseContentIdentifierList = reverse . catMaybes <$> valueparser []
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where
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valueparser l = do
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b <- A8.takeWhile (/= ':')
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let cid = if "!" `S8.isPrefixOf` b
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then ContentIdentifier <$> fromB64Maybe' (S.drop 1 b)
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else Just $ ContentIdentifier b
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ifM A8.atEnd
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( return (cid:l)
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, do
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_ <- A8.char ':'
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valueparser (cid:l)
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)
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prop_parse_build_contentidentifier_log :: ContentIdentifierLog -> Bool
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prop_parse_build_contentidentifier_log l =
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parseLog (toLazyByteString (buildLog l)) == l
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