ed684f651e
As yet unused. Backend.External could perhaps implement it too, although that would involve sending chunks of data to it via a pipe or something, so likely to be slow.
53 lines
1.9 KiB
Haskell
53 lines
1.9 KiB
Haskell
{- git-annex key backend data type
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-
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- Most things should not need this, using Types instead
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-
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- Copyright 2010-2021 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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module Types.Backend where
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import Types.Key
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import Types.KeySource
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import Utility.Metered
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import Utility.FileSystemEncoding
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import Data.ByteString (ByteString)
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data BackendA a = Backend
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{ backendVariety :: KeyVariety
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, genKey :: Maybe (KeySource -> MeterUpdate -> a Key)
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-- Verifies the content of a key, stored in a file, using a hash.
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-- This does not need to be cryptographically secure.
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, verifyKeyContent :: Maybe (Key -> RawFilePath -> a Bool)
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-- Incrementally verifies the content of a key, using the same
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-- hash as verifyKeyContent, but with the content provided
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-- incrementally a peice at a time, until finalized.
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, verifyKeyContentIncrementally :: Maybe (Key -> a IncrementalVerifier)
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-- Checks if a key can be upgraded to a better form.
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, canUpgradeKey :: Maybe (Key -> Bool)
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-- Checks if there is a fast way to migrate a key to a different
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-- backend (ie, without re-hashing).
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, fastMigrate :: Maybe (Key -> BackendA a -> AssociatedFile -> a (Maybe Key))
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-- Checks if a key is known (or assumed) to always refer to the
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-- same data.
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, isStableKey :: Key -> Bool
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-- Checks if a key is verified using a cryptographically secure hash.
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, isCryptographicallySecure :: Key -> Bool
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}
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instance Show (BackendA a) where
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show backend = "Backend { name =\"" ++ decodeBS (formatKeyVariety (backendVariety backend)) ++ "\" }"
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instance Eq (BackendA a) where
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a == b = backendVariety a == backendVariety b
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data IncrementalVerifier = IncrementalVerifier
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{ updateIncremental :: ByteString -> IO ()
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-- ^ Called repeatedly on each peice of the content.
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, finalizeIncremental :: IO Bool
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-- ^ Called once the full content has been sent, returns true
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-- if the hash verified.
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}
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