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{-# LANGUAGE OverloadedStrings #-}
module KnownHosts where
import qualified Data.ByteString.Lazy.Char8 as L
import Data.Char
import Data.List
import qualified SSHKey as SSH
data KnownHostsEntry = KnownHostsEntry
{ eLineno :: Int
, eSp :: [L.ByteString]
, eComment :: L.ByteString
, eKeyBlob :: L.ByteString
, eKey :: Maybe SSH.Key
, eKeyHeader :: L.ByteString
, eHosts :: [L.ByteString]
}
deriving (Eq,Show)
serializeLine :: KnownHostsEntry -> L.ByteString
serializeLine (KnownHostsEntry { eSp = sp
, eComment = comment
, eKeyHeader = hdr
, eKeyBlob = blob
, eKey = _
, eHosts = hosts
})
= L.concat $ zipWith L.append [host,hdr,blob] (take 3 sp) ++ [comment]
-- = L.concat $ zipWith L.append [host,hdr,keyblob] (take 3 sp) ++ [comment]
where
host = L.intercalate "," hosts
-- keyblob = L.dropWhile isSpace $ L.dropWhile (not . isSpace) $ SSH.keyblob key
parseLine :: Int -> L.ByteString -> KnownHostsEntry
parseLine num str = KnownHostsEntry
{ eLineno = num
, eSp = sp
, eComment = comment
, eKeyHeader = hdr
, eKeyBlob = blob
, eKey = key
, eHosts = hosts
}
where
gs = L.groupBy (\a b -> isSpace a==isSpace b) str
(sp,ns) = partition (\x -> isSpace (L.head x)) gs
hosts = do
h <- take 1 ns
let hs = L.groupBy (\_ b -> b/=',') h
hs' = map L.tail $ drop 1 hs
h0 <- take 1 hs
h0 : hs'
hdr = L.concat $ take 1 (drop 1 ns)
blob = L.concat $ take 1 (drop 2 ns)
key = SSH.blobkey $ L.concat $ hdr:" ":blob:[]
comment = L.concat $ zipWith L.append (drop 3 ns) (drop 3 sp ++ repeat "")
data KnownHosts = KnownHosts
{ khcount :: Int
, khentries :: [KnownHostsEntry]
}
decode :: L.ByteString -> KnownHosts
decode input = renum $ foldr grok (KnownHosts 0 []) ls
where
ls = L.lines input
grok x (KnownHosts cnt es) =
KnownHosts (cnt+1) (parseLine 0 x:es)
renum kh = kh { khentries = zipWith setnum [1..] (khentries kh) }
where setnum n e = e { eLineno=n }
encode :: KnownHosts -> L.ByteString
encode kh = L.unlines $ map serializeLine (khentries kh)
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