#include "gadts.h"
module Darcs.Patch.Bundle ( hashBundle, makeBundle, makeBundle2, makeBundleN, scanBundle,
contextPatches, scanContext, patchFilename
) where
import Data.Char ( isAlpha, toLower, isDigit, isSpace )
import Darcs.Hopefully ( PatchInfoAnd, piap,
patchInfoAndPatch,
unavailable, hopefully )
import Darcs.Patch ( RepoPatch, Named, showPatch, showContextPatch, readPatch )
import Darcs.Patch.Info ( PatchInfo, readPatchInfo, showPatchInfo, humanFriendly, isTag )
import Darcs.Patch.Set ( PatchSet(..), Tagged(..), SealedPatchSet )
import Darcs.Patch.Depends ( slightlyOptimizePatchset )
import Darcs.Hopefully( info )
#ifdef GADT_WITNESSES
import Darcs.Patch.Set ( Origin )
#endif
import Darcs.Witnesses.Sealed ( flipSeal, FlippedSeal(..) )
import Darcs.Witnesses.Ordered ( RL(..), FL(..), unsafeCoerceP,
reverseFL, (+<+), mapFL, mapFL_FL, mapRL )
import Printer ( Doc, renderPS, newline, text, ($$),
(<>), vcat, vsep, renderString )
import ByteStringUtils ( linesPS, unlinesPS, dropSpace, substrPS)
import qualified Data.ByteString as B (ByteString, length, null, drop, isPrefixOf)
import qualified Data.ByteString.Char8 as BC (unpack, break, pack)
import SHA1( sha1PS )
import Darcs.Witnesses.Sealed ( Sealed(Sealed), mapSeal )
import Storage.Hashed.Tree( Tree )
import Storage.Hashed.Monad( virtualTreeIO )
hashBundle :: RepoPatch p => [PatchInfo] -> FL (Named p) C(x y) -> String
hashBundle _ to_be_sent = sha1PS $ renderPS
$ vcat (mapFL showPatch to_be_sent) <> newline
makeBundleN :: RepoPatch p => Maybe (Tree IO)
-> PatchSet p C(start x) -> FL (Named p) C(x y) -> IO Doc
makeBundleN the_s (PatchSet ps (Tagged t _ _ :<: _)) to_be_sent =
makeBundle2 the_s (ps +<+ (t :<: NilRL)) to_be_sent to_be_sent
makeBundleN the_s (PatchSet ps NilRL) to_be_sent =
makeBundle2 the_s ps to_be_sent to_be_sent
makeBundle :: RepoPatch p => Maybe (Tree IO) -> RL (PatchInfoAnd p) C(start x)
-> FL (Named p) C(x y) -> IO Doc
makeBundle the_s common to_be_sent = makeBundle2 the_s common to_be_sent to_be_sent
makeBundle2 :: RepoPatch p => Maybe (Tree IO) -> RL (PatchInfoAnd p) C(start x)
-> FL (Named p) C(x y) -> FL (Named p) C(x y) -> IO Doc
makeBundle2 the_s common' to_be_sent to_be_sent2 =
do patches <- case the_s of
Just tree -> fst `fmap` virtualTreeIO (showContextPatch to_be_sent) tree
Nothing -> return (vsep $ mapFL showPatch to_be_sent)
return $ format patches
where format the_new = text ""
$$ text "New patches:"
$$ text ""
$$ the_new
$$ text ""
$$ text "Context:"
$$ text ""
$$ (vcat $ map showPatchInfo common)
$$ text "Patch bundle hash:"
$$ text (hashBundle common to_be_sent2)
$$ text ""
common = mapRL info common'
scanBundle :: RepoPatch p => B.ByteString -> Either String (SealedPatchSet p C(Origin))
scanBundle ps
| B.null ps = Left "Bad patch bundle!"
| otherwise =
case sillyLex ps of
("New patches:",rest) ->
case getPatches rest of
(Sealed patches, rest') ->
case sillyLex rest' of
("Context:", rest'') ->
case getContext rest'' of
(cont,maybe_hash) ->
case substrPS (BC.pack "Patch bundle hash:")
maybe_hash of
Just n ->
if hashBundle cont (mapFL_FL hopefully patches)
== fst (sillyLex $ snd $ sillyLex $
B.drop n maybe_hash)
then seal_up_patches patches cont
else Left $
"Patch bundle failed hash!\n" ++
"This probably means that the patch has been "++
"corrupted by a mailer.\n"++
"The most likely culprit is CRLF newlines."
Nothing -> seal_up_patches patches cont
(a,r) -> Left $ "Malformed patch bundle: '"++a++"' is not 'Context:'"
++ "\n" ++ BC.unpack r
("Context:",rest) ->
case getContext rest of
(cont, rest') ->
case sillyLex rest' of
("New patches:", rest'') ->
case parsePatches rest'' of
Sealed ps'' -> seal_up_patches ps'' cont
(a,_) -> Left $ "Malformed patch bundle: '" ++ a ++
"' is not 'New patches:'"
("-----BEGIN PGP SIGNED MESSAGE-----",rest) ->
scanBundle $ filterGpgDashes rest
(_,rest) -> scanBundle rest
where seal_up_patches :: RepoPatch p => FL (PatchInfoAnd p) C(x y) -> [PatchInfo]
-> Either String (SealedPatchSet p C(Origin))
seal_up_patches xxx yyy =
case reverse yyy of
(x:ry) | isTag x ->
Right $ Sealed (PatchSet
(reverseFL xxx +<+ unavailablePatches (reverse ry))
(Tagged (piUnavailable x) Nothing NilRL :<: NilRL))
_ -> Right $ Sealed (PatchSet (reverseFL xxx +<+ unavailablePatches yyy)
NilRL)
filterGpgDashes :: B.ByteString -> B.ByteString
filterGpgDashes ps =
unlinesPS $ map drop_dashes $
takeWhile (/= BC.pack "-----END PGP SIGNED MESSAGE-----") $
dropWhile not_context_or_newpatches $ linesPS ps
where drop_dashes x = if B.length x < 2 then x
else if BC.pack "- " `B.isPrefixOf` x
then B.drop 2 x
else x
not_context_or_newpatches s = (s /= BC.pack "Context:") &&
(s /= BC.pack "New patches:")
unavailablePatches :: RepoPatch p => [PatchInfo] -> RL (PatchInfoAnd p) C(x y)
unavailablePatches [] = unsafeCoerceP NilRL
unavailablePatches (x:xs) = piUnavailable x :<: unavailablePatches xs
piUnavailable :: RepoPatch p => PatchInfo -> PatchInfoAnd p C(x y)
piUnavailable i = (i `patchInfoAndPatch`
unavailable ("Patch not stored in patch bundle:\n" ++
renderString (humanFriendly i)))
getContext :: B.ByteString -> ([PatchInfo],B.ByteString)
getContext ps =
case readPatchInfo ps of
Just (pinfo,r') ->
case getContext r' of
(pis,r'') -> (pinfo:pis, r'')
Nothing -> ([],ps)
(-:-) :: a C(x y) -> (Sealed (FL a C(y)),b) -> (Sealed (FL a C(x)),b)
p -:- (Sealed ps, r) = (Sealed (p:>:ps), r)
getPatches :: RepoPatch p => B.ByteString -> (Sealed (FL (PatchInfoAnd p) C(x)), B.ByteString)
getPatches ps =
case readPatchInfo ps of
Nothing -> (Sealed NilFL, ps)
Just (pinfo,_) ->
case readPatch ps of
Nothing -> (Sealed NilFL, ps)
Just (Sealed p, r) -> (pinfo `piap` p) -:- getPatches r
parsePatches :: RepoPatch p => B.ByteString -> Sealed (FL (PatchInfoAnd p) C(x))
parsePatches ps =
case readPatchInfo ps of
Nothing -> Sealed NilFL
Just (pinfo,_) ->
case readPatch ps of
Nothing -> Sealed NilFL
Just (Sealed p, r) -> ((pinfo `piap` p) :>:) `mapSeal` parsePatches r
sillyLex :: B.ByteString -> (String, B.ByteString)
sillyLex ps = (BC.unpack a, b)
where
(a, b) = BC.break (== '\n') (dropSpace ps)
contextPatches :: RepoPatch p => PatchSet p C(Origin x) -> FlippedSeal (RL (PatchInfoAnd p)) C(x)
contextPatches set = case slightlyOptimizePatchset set of
PatchSet ps (Tagged t _ _ :<: _) -> flipSeal (ps +<+ (t :<: NilRL))
PatchSet ps NilRL -> flipSeal ps
scanContext :: RepoPatch p => B.ByteString -> PatchSet p C(Origin x)
scanContext ps
| B.null ps = error "Bad context!"
| otherwise =
case sillyLex ps of
("Context:",rest) ->
case getContext rest of
(cont@(_:_), _) | isTag (last cont) ->
PatchSet (unavailablePatches $ init cont)
(Tagged (piUnavailable $ last cont) Nothing NilRL :<: NilRL)
(cont, _) -> PatchSet (unavailablePatches cont) NilRL
("-----BEGIN PGP SIGNED MESSAGE-----",rest) ->
scanContext $ filterGpgDashes rest
(_,rest) -> scanContext rest
patchFilename :: String -> String
patchFilename the_summary = name ++ ".dpatch"
where name = map safeFileChar the_summary
safeFileChar c | isAlpha c = toLower c
| isDigit c = c
| isSpace c = '-'
safeFileChar _ = '_'