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{-# LANGUAGE OverloadedStrings #-}
module PEM where
import Data.Maybe
import Data.Monoid
import qualified Data.ByteString.Lazy as LW
import qualified Data.ByteString.Lazy.Char8 as L
import Control.Monad
import Control.Applicative
import qualified Codec.Binary.Base64 as Base64
import ScanningParser
data PEMBlob = PEMBlob { pemType :: L.ByteString
, pemBlob :: L.ByteString
}
pemParser mtyp = ScanningParser (maybe fndany fndtyp mtyp) pbdy
where
hdr typ = "-----BEGIN " <> typ <> "-----"
fndtyp typ bs = if bs==hdr typ then Just typ else Nothing
fndany bs = do
guard $ "-----BEGIN " `L.isPrefixOf` bs
let x0 = L.drop 11 bs
guard $ "-----" `LW.isSuffixOf` x0
let typ = L.take (L.length x0 - 5) x0
return typ
pbdy typ xs = (mblob, rs)
where
(ys,rs) = span (/="-----END " <> typ <> "-----") xs
mblob = PEMBlob typ <$> LW.pack <$> Base64.decode (L.unpack dta)
dta = case ys of
_:dta_lines -> L.concat dta_lines
[] -> ""
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