416 lines
13 KiB
Haskell
416 lines
13 KiB
Haskell
{- BitTorrent remote.
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-
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- Copyright 2014 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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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE CPP #-}
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module Remote.BitTorrent (remote) where
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import Annex.Common
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import Types.Remote
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import qualified Annex
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import qualified Git
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import qualified Git.Construct
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import Config
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import Config.Cost
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import Logs.Web
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import Types.UrlContents
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import Types.CleanupActions
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import Messages.Progress
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import Utility.Metered
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import Utility.Tmp
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import Utility.Url.Parse
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import Backend.URL
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import Annex.Perms
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import Annex.Tmp
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import Annex.UUID
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import qualified Annex.Url as Url
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import Remote.Helper.ExportImport
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import Annex.SpecialRemote.Config
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import qualified Utility.RawFilePath as R
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import Network.URI
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import qualified System.FilePath.ByteString as P
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#ifdef WITH_TORRENTPARSER
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import Data.Torrent
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import qualified Data.ByteString.Lazy as B
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#endif
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remote :: RemoteType
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remote = RemoteType
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{ typename = "bittorrent"
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, enumerate = list
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, generate = gen
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, configParser = mkRemoteConfigParser []
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, setup = giveup "not supported"
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, exportSupported = exportUnsupported
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, importSupported = importUnsupported
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, thirdPartyPopulated = False
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}
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-- There is only one bittorrent remote, and it always exists.
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list :: Bool -> Annex [Git.Repo]
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list _autoinit = do
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r <- liftIO $ Git.Construct.remoteNamed "bittorrent" (pure Git.Construct.fromUnknown)
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return [r]
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gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> RemoteStateHandle -> Annex (Maybe Remote)
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gen r _ rc gc rs = do
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c <- parsedRemoteConfig remote rc
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cst <- remoteCost gc c expensiveRemoteCost
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return $ Just Remote
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{ uuid = bitTorrentUUID
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, cost = cst
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, name = Git.repoDescribe r
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, storeKey = uploadKey
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, retrieveKeyFile = downloadKey
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, retrieveKeyFileCheap = Nothing
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-- Bittorrent does its own hash checks.
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, retrievalSecurityPolicy = RetrievalAllKeysSecure
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, removeKey = dropKey
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, lockContent = Nothing
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, checkPresent = checkKey
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, checkPresentCheap = False
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, exportActions = exportUnsupported
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, importActions = importUnsupported
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, whereisKey = Nothing
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, remoteFsck = Nothing
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, repairRepo = Nothing
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, config = c
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, gitconfig = gc
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, localpath = Nothing
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, getRepo = return r
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, readonly = True
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, appendonly = False
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, untrustworthy = False
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, availability = pure GloballyAvailable
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, remotetype = remote
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, mkUnavailable = return Nothing
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, getInfo = return []
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, claimUrl = Just (pure . isSupportedUrl)
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, checkUrl = Just checkTorrentUrl
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, remoteStateHandle = rs
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}
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downloadKey :: Key -> AssociatedFile -> FilePath -> MeterUpdate -> VerifyConfig -> Annex Verification
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downloadKey key _file dest p _ = do
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get . map (torrentUrlNum . fst . getDownloader) =<< getBitTorrentUrls key
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-- While bittorrent verifies the hash in the torrent file,
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-- the torrent file itself is downloaded without verification,
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-- so the overall download is not verified.
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return UnVerified
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where
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get [] = giveup "could not download torrent"
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get urls = do
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showOutput -- make way for download progress bar
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ok <- untilTrue urls $ \(u, filenum) -> do
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registerTorrentCleanup u
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checkDependencies
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ifM (downloadTorrentFile u)
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( downloadTorrentContent key u dest filenum p
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, return False
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)
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unless ok $
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get []
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uploadKey :: Key -> AssociatedFile -> Maybe FilePath -> MeterUpdate -> Annex ()
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uploadKey _ _ _ _ = giveup "upload to bittorrent not supported"
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dropKey :: Key -> Annex ()
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dropKey k = mapM_ (setUrlMissing k) =<< getBitTorrentUrls k
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{- We punt and don't try to check if a torrent has enough seeders
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- with all the pieces etc. That would be quite hard.. and even if
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- implemented, it tells us nothing about the later state of the torrent.
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-}
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checkKey :: Key -> Annex Bool
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checkKey = giveup "cannot reliably check torrent status"
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getBitTorrentUrls :: Key -> Annex [URLString]
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getBitTorrentUrls key = filter supported <$> getUrls key
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where
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supported u =
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let (u', dl) = (getDownloader u)
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in dl == OtherDownloader && isSupportedUrl u'
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isSupportedUrl :: URLString -> Bool
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isSupportedUrl u = isTorrentMagnetUrl u || isTorrentUrl u
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isTorrentUrl :: URLString -> Bool
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isTorrentUrl = maybe False (\u -> ".torrent" `isSuffixOf` uriPath u) . parseURIPortable
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isTorrentMagnetUrl :: URLString -> Bool
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isTorrentMagnetUrl u = "magnet:" `isPrefixOf` u && checkbt (parseURIPortable u)
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where
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checkbt (Just uri) | "xt=urn:btih:" `isInfixOf` uriQuery uri = True
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checkbt _ = False
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checkTorrentUrl :: URLString -> Annex UrlContents
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checkTorrentUrl u = do
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checkDependencies
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registerTorrentCleanup u
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ifM (downloadTorrentFile u)
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( torrentContents u
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, giveup "could not download torrent file"
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)
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{- To specify which file inside a multi-url torrent, the file number is
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- appended to the url. -}
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torrentUrlWithNum :: URLString -> Int -> URLString
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torrentUrlWithNum u n = u ++ "#" ++ show n
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torrentUrlNum :: URLString -> (URLString, Int)
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torrentUrlNum u
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| '#' `elem` u =
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let (n, ru) = separate (== '#') (reverse u)
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in (reverse ru, fromMaybe 1 $ readish $ reverse n)
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| otherwise = (u, 1)
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{- A Key corresponding to the URL of a torrent file. -}
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torrentUrlKey :: URLString -> Annex Key
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torrentUrlKey u = return $ fromUrl (fst $ torrentUrlNum u) Nothing False
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{- Temporary filename to use to store the torrent file. -}
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tmpTorrentFile :: URLString -> Annex RawFilePath
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tmpTorrentFile u = fromRepo . gitAnnexTmpObjectLocation =<< torrentUrlKey u
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{- A cleanup action is registered to delete the torrent file
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- when git-annex exits.
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-
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- This allows multiple actions that use the same torrent file
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- directory to run in a single git-annex run, and only download the
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- torrent file once.
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-}
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registerTorrentCleanup :: URLString -> Annex ()
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registerTorrentCleanup u = Annex.addCleanupAction (TorrentCleanup u) $
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liftIO . removeWhenExistsWith R.removeLink =<< tmpTorrentFile u
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{- Downloads the torrent file. (Not its contents.) -}
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downloadTorrentFile :: URLString -> Annex Bool
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downloadTorrentFile u = do
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torrent <- tmpTorrentFile u
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ifM (liftIO $ doesFileExist (fromRawFilePath torrent))
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( return True
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, do
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showAction "downloading torrent file"
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createAnnexDirectory (parentDir torrent)
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if isTorrentMagnetUrl u
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then withOtherTmp $ \othertmp -> do
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kf <- keyFile <$> torrentUrlKey u
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let metadir = othertmp P.</> "torrentmeta" P.</> kf
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createAnnexDirectory metadir
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showOutput
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ok <- downloadMagnetLink u
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(fromRawFilePath metadir)
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(fromRawFilePath torrent)
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liftIO $ removeDirectoryRecursive
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(fromRawFilePath metadir)
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return ok
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else withOtherTmp $ \othertmp -> do
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withTmpFileIn (fromRawFilePath othertmp) "torrent" $ \f h -> do
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liftIO $ hClose h
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resetAnnexFilePerm (toRawFilePath f)
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ok <- Url.withUrlOptions $
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Url.download nullMeterUpdate Nothing u f
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when ok $
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liftIO $ moveFile (toRawFilePath f) torrent
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return ok
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)
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downloadMagnetLink :: URLString -> FilePath -> FilePath -> Annex Bool
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downloadMagnetLink u metadir dest = ifM download
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( liftIO $ do
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ts <- filter (".torrent" `isSuffixOf`)
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<$> dirContents metadir
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case ts of
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(t:[]) -> do
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moveFile (toRawFilePath t) (toRawFilePath dest)
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return True
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_ -> return False
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, return False
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)
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where
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download = runAria
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[ Param "--bt-metadata-only"
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, Param "--bt-save-metadata"
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, Param u
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, Param "--seed-time=0"
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, Param "--summary-interval=0"
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, Param "-d"
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, File metadir
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]
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downloadTorrentContent :: Key -> URLString -> FilePath -> Int -> MeterUpdate -> Annex Bool
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downloadTorrentContent k u dest filenum p = do
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torrent <- tmpTorrentFile u
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withOtherTmp $ \othertmp -> do
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kf <- keyFile <$> torrentUrlKey u
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let downloaddir = othertmp P.</> "torrent" P.</> kf
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createAnnexDirectory downloaddir
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f <- wantedfile torrent
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let dlf = fromRawFilePath downloaddir </> f
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showOutput
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ifM (download torrent downloaddir <&&> liftIO (doesFileExist dlf))
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( do
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liftIO $ moveFile (toRawFilePath dlf) (toRawFilePath dest)
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-- The downloaddir is not removed here,
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-- so if aria downloaded parts of other
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-- files, and this is called again, it will
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-- resume where it left off.
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-- withOtherTmp registers a cleanup action
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-- that will clean up leftover files when
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-- git-annex terminates.
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return True
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, return False
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)
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where
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download torrent tmpdir = ariaProgress (fromKey keySize k) p
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[ Param $ "--select-file=" ++ show filenum
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, File (fromRawFilePath torrent)
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, Param "-d"
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, File (fromRawFilePath tmpdir)
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, Param "--seed-time=0"
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, Param "--summary-interval=0"
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, Param "--file-allocation=none"
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-- Needed so aria will resume partially downloaded files
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-- in multi-file torrents.
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, Param "--check-integrity=true"
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]
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{- aria2c will create part of the directory structure
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- contained in the torrent. It may download parts of other files
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- in addition to the one we asked for. So, we need to find
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- out the filename we want based on the filenum.
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-}
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wantedfile torrent = do
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fs <- liftIO $ map fst <$> torrentFileSizes torrent
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if length fs >= filenum
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then return (fs !! (filenum - 1))
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else giveup "Number of files in torrent seems to have changed."
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checkDependencies :: Annex ()
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checkDependencies = do
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missing <- liftIO $ filterM (not <$$> inSearchPath) deps
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unless (null missing) $
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giveup $ "need to install additional software in order to download from bittorrent: " ++ unwords missing
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where
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deps =
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[ "aria2c"
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#ifndef WITH_TORRENTPARSER
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, "btshowmetainfo"
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#endif
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]
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ariaParams :: [CommandParam] -> Annex [CommandParam]
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ariaParams ps = do
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opts <- map Param . annexAriaTorrentOptions <$> Annex.getGitConfig
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return (ps ++ opts)
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runAria :: [CommandParam] -> Annex Bool
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runAria ps = progressCommand "aria2c" =<< ariaParams ps
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-- Parse aria output to find "(n%)" and update the progress meter
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-- with it.
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ariaProgress :: Maybe Integer -> MeterUpdate -> [CommandParam] -> Annex Bool
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ariaProgress Nothing _ ps = runAria ps
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ariaProgress (Just sz) meter ps = do
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oh <- mkOutputHandler
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liftIO . commandMeter (parseAriaProgress sz) oh Nothing meter "aria2c"
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=<< ariaParams ps
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parseAriaProgress :: Integer -> ProgressParser
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parseAriaProgress totalsize = go [] . reverse . splitc '\r'
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where
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go remainder [] = (Nothing, Nothing, remainder)
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go remainder (x:xs) = case readish (findpercent x) of
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Nothing -> go (x++remainder) xs
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Just p -> (Just (frompercent p), Nothing, remainder)
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-- "(N%)"
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findpercent = takeWhile (/= '%') . drop 1 . dropWhile (/= '(')
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frompercent p = toBytesProcessed $ totalsize * p `div` 100
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{- Used only if the haskell torrent library is not available. -}
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#ifndef WITH_TORRENTPARSER
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btshowmetainfo :: FilePath -> String -> IO [String]
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btshowmetainfo torrent field =
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findfield [] . lines <$> readProcess "btshowmetainfo" [torrent]
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where
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findfield c [] = reverse c
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findfield c (l:ls)
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| l == fieldkey = multiline c ls
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| fieldkey `isPrefixOf` l =
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findfield ((drop (length fieldkey) l):c) ls
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| otherwise = findfield c ls
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multiline c (l:ls)
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| " " `isPrefixOf` l = multiline (drop 3 l:c) ls
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| otherwise = findfield c ls
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multiline c [] = findfield c []
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fieldkey = field ++ take (14 - length field) (repeat '.') ++ ": "
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#endif
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{- Examines the torrent file and gets the list of files in it,
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- and their sizes.
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-}
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torrentFileSizes :: RawFilePath -> IO [(FilePath, Integer)]
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torrentFileSizes torrent = do
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#ifdef WITH_TORRENTPARSER
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let mkfile = joinPath . map (scrub . decodeBL)
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b <- B.readFile (fromRawFilePath torrent)
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return $ case readTorrent b of
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Left e -> giveup $ "failed to parse torrent: " ++ e
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Right t -> case tInfo t of
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SingleFile { tLength = l, tName = f } ->
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[ (mkfile [f], l) ]
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MultiFile { tFiles = fs, tName = dir } ->
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map (\tf -> (mkfile $ dir:filePath tf, fileLength tf)) fs
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where
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#else
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files <- getfield "files"
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if null files
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then do
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fnl <- getfield "file name"
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szl <- map readish <$> getfield "file size"
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case (fnl, szl) of
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((fn:[]), (Just sz:[])) -> return [(scrub fn, sz)]
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_ -> parsefailed (show (fnl, szl))
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else do
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v <- getfield "directory name"
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case v of
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(d:[]) -> return $ map (splitsize d) files
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_ -> parsefailed (show v)
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where
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getfield = btshowmetainfo (fromRawFilePath torrent)
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parsefailed s = giveup $ "failed to parse btshowmetainfo output for torrent file: " ++ show s
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-- btshowmetainfo outputs a list of "filename (size)"
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splitsize d l = (scrub (d </> fn), sz)
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where
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sz = fromMaybe (parsefailed l) $ readish $
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reverse $ takeWhile (/= '(') $ dropWhile (== ')') $
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reverse l
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fn = reverse $ drop 2 $
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dropWhile (/= '(') $ dropWhile (== ')') $ reverse l
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#endif
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-- a malicious torrent file might try to do directory traversal
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scrub f = if isAbsolute f || any (== "..") (splitPath f)
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then giveup "found unsafe filename in torrent!"
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else f
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torrentContents :: URLString -> Annex UrlContents
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torrentContents u = convert
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<$> (liftIO . torrentFileSizes =<< tmpTorrentFile u)
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where
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convert [(fn, sz)] = UrlContents (Just sz) (Just fn)
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convert l = UrlMulti $ map mkmulti (zip l [1..])
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mkmulti ((fn, sz), n) =
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(torrentUrlWithNum u n, Just sz, joinPath $ drop 1 $ splitPath fn)
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