40ecf58d4b
This does not change the overall license of the git-annex program, which was already AGPL due to a number of sources files being AGPL already. Legally speaking, I'm adding a new license under which these files are now available; I already released their current contents under the GPL license. Now they're dual licensed GPL and AGPL. However, I intend for all my future changes to these files to only be released under the AGPL license, and I won't be tracking the dual licensing status, so I'm simply changing the license statement to say it's AGPL. (In some cases, others wrote parts of the code of a file and released it under the GPL; but in all cases I have contributed a significant portion of the code in each file and it's that code that is getting the AGPL license; the GPL license of other contributors allows combining with AGPL code.)
32 lines
844 B
Haskell
32 lines
844 B
Haskell
{- git-annex backend utilities
|
|
-
|
|
- Copyright 2012-2019 Joey Hess <id@joeyh.name>
|
|
-
|
|
- Licensed under the GNU AGPL version 3 or higher.
|
|
-}
|
|
|
|
module Backend.Utilities where
|
|
|
|
import Annex.Common
|
|
import Utility.Hash
|
|
|
|
import qualified Data.ByteString as S
|
|
|
|
{- Generates a keyName from an input string. Takes care of sanitizing it.
|
|
- If it's not too long, the full string is used as the keyName.
|
|
- Otherwise, it's truncated, and its md5 is prepended to ensure a unique
|
|
- key. -}
|
|
genKeyName :: String -> S.ByteString
|
|
genKeyName s
|
|
-- Avoid making keys longer than the length of a SHA256 checksum.
|
|
| bytelen > sha256len = encodeBS' $
|
|
truncateFilePath (sha256len - md5len - 1) s' ++ "-" ++
|
|
show (md5 (encodeBL s))
|
|
| otherwise = encodeBS' s'
|
|
where
|
|
s' = preSanitizeKeyName s
|
|
bytelen = length (decodeW8 s')
|
|
|
|
sha256len = 64
|
|
md5len = 32
|
|
|