323 lines
10 KiB
Haskell
323 lines
10 KiB
Haskell
{- WebDAV remotes.
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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{-# LANGUAGE ScopedTypeVariables #-}
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module Remote.WebDAV (remote, davCreds, setCredsEnv) where
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import Network.Protocol.HTTP.DAV
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import qualified Data.Map as M
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import qualified Data.ByteString.UTF8 as B8
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import qualified Data.ByteString.Lazy.UTF8 as L8
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import qualified Data.ByteString.Lazy as L
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import Network.URI (normalizePathSegments)
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import qualified Control.Exception as E
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import Network.HTTP.Conduit (HttpException(..))
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import Network.HTTP.Types
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import System.IO.Error
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import Common.Annex
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import Types.Remote
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import qualified Git
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import Config
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import Remote.Helper.Special
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import Remote.Helper.Encryptable
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import Remote.Helper.Chunked
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import Crypto
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import Creds
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import Meters
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type DavUrl = String
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type DavUser = B8.ByteString
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type DavPass = B8.ByteString
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remote :: RemoteType
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remote = RemoteType {
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typename = "webdav",
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enumerate = findSpecialRemotes "webdav",
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generate = gen,
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setup = webdavSetup
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}
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gen :: Git.Repo -> UUID -> RemoteConfig -> Annex Remote
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gen r u c = new <$> remoteCost r expensiveRemoteCost
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where
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new cst = encryptableRemote c
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(storeEncrypted this)
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(retrieveEncrypted this)
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this
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where
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this = Remote {
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uuid = u,
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cost = cst,
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name = Git.repoDescribe r,
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storeKey = store this,
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retrieveKeyFile = retrieve this,
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retrieveKeyFileCheap = retrieveCheap this,
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removeKey = remove this,
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hasKey = checkPresent this,
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hasKeyCheap = False,
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whereisKey = Nothing,
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config = c,
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repo = r,
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localpath = Nothing,
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readonly = False,
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remotetype = remote
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}
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webdavSetup :: UUID -> RemoteConfig -> Annex RemoteConfig
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webdavSetup u c = do
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let url = fromMaybe (error "Specify url=") $
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M.lookup "url" c
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c' <- encryptionSetup c
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creds <- getCreds c' u
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testDav url creds
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gitConfigSpecialRemote u c' "webdav" "true"
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setRemoteCredPair c' (davCreds u)
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store :: Remote -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
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store r k _f p = metered (Just p) k $ \meterupdate ->
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davAction r False $ \(baseurl, user, pass) -> do
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f <- inRepo $ gitAnnexLocation k
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liftIO $ withMeteredFile f meterupdate $
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storeHelper r k baseurl user pass
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storeEncrypted :: Remote -> (Cipher, Key) -> Key -> MeterUpdate -> Annex Bool
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storeEncrypted r (cipher, enck) k p = metered (Just p) k $ \meterupdate ->
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davAction r False $ \(baseurl, user, pass) -> do
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f <- inRepo $ gitAnnexLocation k
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liftIO $ encrypt cipher (streamMeteredFile f meterupdate) $
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readBytes $ storeHelper r enck baseurl user pass
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storeHelper :: Remote -> Key -> DavUrl -> DavUser -> DavPass -> L.ByteString -> IO Bool
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storeHelper r k baseurl user pass b = catchBoolIO $ do
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davMkdir tmpurl user pass
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storeChunks k tmpurl keyurl chunksize storer recorder finalizer
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where
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tmpurl = tmpLocation baseurl k
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keyurl = davLocation baseurl k
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chunksize = chunkSize $ config r
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storer urls = storeChunked chunksize urls storehttp b
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recorder url s = storehttp url (L8.fromString s)
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finalizer srcurl desturl = do
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void $ catchMaybeHttp (deleteContent desturl user pass)
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davMkdir (urlParent desturl) user pass
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moveContent srcurl (B8.fromString desturl) user pass
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storehttp url v = putContent url user pass
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(contentType, v)
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retrieveCheap :: Remote -> Key -> FilePath -> Annex Bool
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retrieveCheap _ _ _ = return False
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retrieve :: Remote -> Key -> AssociatedFile -> FilePath -> Annex Bool
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retrieve r k _f d = metered Nothing k $ \meterupdate ->
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davAction r False $ \(baseurl, user, pass) -> liftIO $ catchBoolIO $
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withStoredFiles r k baseurl user pass onerr $ \urls -> do
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meteredWriteFileChunks meterupdate d urls $ \url -> do
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mb <- davGetUrlContent url user pass
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case mb of
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Nothing -> throwIO "download failed"
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Just b -> return b
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return True
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where
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onerr _ = return False
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retrieveEncrypted :: Remote -> (Cipher, Key) -> Key -> FilePath -> Annex Bool
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retrieveEncrypted r (cipher, enck) k d = metered Nothing k $ \meterupdate ->
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davAction r False $ \(baseurl, user, pass) -> liftIO $ catchBoolIO $
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withStoredFiles r enck baseurl user pass onerr $ \urls -> do
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decrypt cipher (feeder user pass urls) $
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readBytes $ meteredWriteFile meterupdate d
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return True
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where
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onerr _ = return False
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feeder _ _ [] _ = noop
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feeder user pass (url:urls) h = do
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mb <- davGetUrlContent url user pass
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case mb of
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Nothing -> throwIO "download failed"
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Just b -> do
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L.hPut h b
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feeder user pass urls h
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remove :: Remote -> Key -> Annex Bool
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remove r k = davAction r False $ \(baseurl, user, pass) -> liftIO $ do
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-- Delete the key's whole directory, including any chunked
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-- files, etc, in a single action.
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let url = davLocation baseurl k
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isJust <$> catchMaybeHttp (deleteContent url user pass)
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checkPresent :: Remote -> Key -> Annex (Either String Bool)
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checkPresent r k = davAction r noconn go
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where
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noconn = Left $ error $ name r ++ " not configured"
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go (baseurl, user, pass) = do
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showAction $ "checking " ++ name r
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liftIO $ withStoredFiles r k baseurl user pass onerr check
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where
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check [] = return $ Right True
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check (url:urls) = do
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v <- davUrlExists url user pass
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if v == Right True
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then check urls
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else return v
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{- Failed to read the chunkcount file; see if it's missing,
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- or if there's a problem accessing it,
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- or perhaps this was an intermittent error. -}
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onerr url = do
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v <- davUrlExists url user pass
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if v == Right True
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then return $ Left $ "failed to read " ++ url
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else return v
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withStoredFiles
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:: Remote
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-> Key
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-> DavUrl
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-> DavUser
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-> DavPass
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-> (DavUrl -> IO a)
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-> ([DavUrl] -> IO a)
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-> IO a
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withStoredFiles r k baseurl user pass onerr a
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let chunkcount = keyurl ++ chunkCount
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maybe (onerr chunkcount) (a . listChunks keyurl . L8.toString)
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=<< davGetUrlContent chunkcount user pass
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| otherwise = a [keyurl]
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where
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keyurl = davLocation baseurl k ++ keyFile k
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davAction :: Remote -> a -> ((DavUrl, DavUser, DavPass) -> Annex a) -> Annex a
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davAction r unconfigured action = do
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mcreds <- getCreds (config r) (uuid r)
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case (mcreds, M.lookup "url" $ config r) of
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(Just (user, pass), Just url) ->
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action (url, toDavUser user, toDavPass pass)
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_ -> return unconfigured
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toDavUser :: String -> DavUser
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toDavUser = B8.fromString
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toDavPass :: String -> DavPass
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toDavPass = B8.fromString
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{- The directory where files(s) for a key are stored. -}
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davLocation :: DavUrl -> Key -> DavUrl
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davLocation baseurl k = addTrailingPathSeparator $
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davUrl baseurl $ hashDirLower k </> keyFile k
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{- Where we store temporary data for a key as it's being uploaded. -}
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tmpLocation :: DavUrl -> Key -> DavUrl
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tmpLocation baseurl k = addTrailingPathSeparator $
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davUrl baseurl $ "tmp" </> keyFile k
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davUrl :: DavUrl -> FilePath -> DavUrl
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davUrl baseurl file = baseurl </> file
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davUrlExists :: DavUrl -> DavUser -> DavPass -> IO (Either String Bool)
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davUrlExists url user pass = decode <$> catchHttp (getProps url user pass)
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where
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decode (Right _) = Right True
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decode (Left (Left (StatusCodeException status _)))
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| statusCode status == statusCode notFound404 = Right False
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decode (Left e) = Left $ showEitherException e
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davGetUrlContent :: DavUrl -> DavUser -> DavPass -> IO (Maybe L.ByteString)
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davGetUrlContent url user pass = fmap (snd . snd) <$>
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catchMaybeHttp (getPropsAndContent url user pass)
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{- Creates a directory in WebDAV, if not already present; also creating
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- any missing parent directories. -}
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davMkdir :: DavUrl -> DavUser -> DavPass -> IO ()
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davMkdir url user pass = go url
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where
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make u = makeCollection u user pass
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go u = do
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r <- E.try (make u) :: IO (Either E.SomeException Bool)
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case r of
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{- Parent directory is missing. Recurse to create
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- it, and try once more to create the directory. -}
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Right False -> do
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go (urlParent u)
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void $ make u
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{- Directory created successfully -}
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Right True -> return ()
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{- Directory already exists, or some other error
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- occurred. In the latter case, whatever wanted
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- to use this directory will fail. -}
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Left _ -> return ()
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{- Catches HTTP and IO exceptions. -}
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catchMaybeHttp :: IO a -> IO (Maybe a)
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catchMaybeHttp a = (Just <$> a) `E.catches`
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[ E.Handler $ \(_e :: HttpException) -> return Nothing
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, E.Handler $ \(_e :: E.IOException) -> return Nothing
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]
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{- Catches HTTP and IO exceptions -}
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catchHttp :: IO a -> IO (Either EitherException a)
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catchHttp a = (Right <$> a) `E.catches`
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[ E.Handler $ \(e :: HttpException) -> return $ Left $ Left e
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, E.Handler $ \(e :: E.IOException) -> return $ Left $ Right e
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]
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type EitherException = Either HttpException E.IOException
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showEitherException :: EitherException -> String
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showEitherException (Left (StatusCodeException status _)) = show $ statusMessage status
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showEitherException (Left httpexception) = show httpexception
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showEitherException (Right ioexception) = show ioexception
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throwIO :: String -> IO a
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throwIO msg = ioError $ mkIOError userErrorType msg Nothing Nothing
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urlParent :: DavUrl -> DavUrl
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urlParent url = dropTrailingPathSeparator $
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normalizePathSegments (dropTrailingPathSeparator url ++ "/..")
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where
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{- Test if a WebDAV store is usable, by writing to a test file, and then
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- deleting the file. Exits with an IO error if not. -}
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testDav :: String -> Maybe CredPair -> Annex ()
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testDav baseurl (Just (u, p)) = do
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showSideAction "testing WebDAV server"
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test "make directory" $ davMkdir baseurl user pass
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test "write file" $ putContent testurl user pass
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(contentType, L.empty)
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test "delete file" $ deleteContent testurl user pass
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where
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test desc a = liftIO $
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either (\e -> throwIO $ "WebDAV failed to " ++ desc ++ ": " ++ showEitherException e)
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(const noop)
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=<< catchHttp a
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user = toDavUser u
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pass = toDavPass p
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testurl = davUrl baseurl "git-annex-test"
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testDav _ Nothing = error "Need to configure webdav username and password."
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{- Content-Type to use for files uploaded to WebDAV. -}
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contentType :: Maybe B8.ByteString
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contentType = Just $ B8.fromString "application/octet-stream"
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getCreds :: RemoteConfig -> UUID -> Annex (Maybe CredPair)
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getCreds c u = getRemoteCredPairFor "webdav" c (davCreds u)
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davCreds :: UUID -> CredPairStorage
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davCreds u = CredPairStorage
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{ credPairFile = fromUUID u
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, credPairEnvironment = ("WEBDAV_USERNAME", "WEBDAV_PASSWORD")
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, credPairRemoteKey = Just "davcreds"
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}
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setCredsEnv :: (String, String) -> IO ()
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setCredsEnv creds = setEnvCredPair creds $ davCreds undefined
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