5fe49b98f8
To support this, a core.gcrypt-id is stored by git-annex inside the git config of a local gcrypt repository, when setting it up. That is compared with the remote's cached gcrypt-id. When different, a drive has been changed. git-annex then looks up the remote config for the uuid mapped from the core.gcrypt-id, and tweaks the configuration appropriately. When there is no known config for the uuid, it will refuse to use the remote.
342 lines
11 KiB
Haskell
342 lines
11 KiB
Haskell
{- S3 remotes
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-
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- Copyright 2011-2013 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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module Remote.S3 (remote, iaHost, isIA, isIAHost, iaItemUrl) where
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import Network.AWS.AWSConnection
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import Network.AWS.S3Object hiding (getStorageClass)
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import Network.AWS.S3Bucket hiding (size)
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import Network.AWS.AWSResult
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import qualified Data.Text as T
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import qualified Data.ByteString.Lazy.Char8 as L
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import qualified Data.Map as M
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import Data.Char
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import Network.Socket (HostName)
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import Common.Annex
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import Types.Remote
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import Types.Key
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import qualified Git
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import Config
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import Config.Cost
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import Remote.Helper.Special
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import Remote.Helper.Encryptable
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import qualified Remote.Helper.AWS as AWS
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import Crypto
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import Creds
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import Utility.Metered
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import Annex.Content
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import Annex.UUID
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import Logs.Web
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type Bucket = String
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remote :: RemoteType
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remote = RemoteType {
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typename = "S3",
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enumerate = findSpecialRemotes "s3",
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generate = gen,
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setup = s3Setup
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}
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gen :: Git.Repo -> UUID -> RemoteConfig -> RemoteGitConfig -> Annex (Maybe Remote)
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gen r u c gc = new <$> remoteCost gc expensiveRemoteCost
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where
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new cst = Just $ 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 c,
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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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gitconfig = gc,
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localpath = Nothing,
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readonly = False,
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globallyAvailable = True,
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remotetype = remote
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}
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s3Setup :: Maybe UUID -> RemoteConfig -> Annex (RemoteConfig, UUID)
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s3Setup mu c = do
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u <- maybe (liftIO genUUID) return mu
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s3Setup' u c
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s3Setup' :: UUID -> RemoteConfig -> Annex (RemoteConfig, UUID)
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s3Setup' u c = if isIA c then archiveorg else defaulthost
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where
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remotename = fromJust (M.lookup "name" c)
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defbucket = remotename ++ "-" ++ fromUUID u
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defaults = M.fromList
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[ ("datacenter", T.unpack $ AWS.defaultRegion AWS.S3)
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, ("storageclass", "STANDARD")
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, ("host", defaultAmazonS3Host)
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, ("port", show defaultAmazonS3Port)
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, ("bucket", defbucket)
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]
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use fullconfig = do
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gitConfigSpecialRemote u fullconfig "s3" "true"
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c' <- setRemoteCredPair fullconfig (AWS.creds u)
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return (c', u)
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defaulthost = do
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c' <- encryptionSetup c
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let fullconfig = c' `M.union` defaults
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genBucket fullconfig u
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use fullconfig
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archiveorg = do
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showNote "Internet Archive mode"
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maybe (error "specify bucket=") (const noop) $
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getBucket archiveconfig
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writeUUIDFile archiveconfig u
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use archiveconfig
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where
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archiveconfig =
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-- hS3 does not pass through x-archive-* headers
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M.mapKeys (replace "x-archive-" "x-amz-") $
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-- encryption does not make sense here
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M.insert "encryption" "none" $
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M.union c $
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-- special constraints on key names
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M.insert "mungekeys" "ia" $
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-- bucket created only when files are uploaded
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M.insert "x-amz-auto-make-bucket" "1" $
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-- no default bucket name; should be human-readable
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M.delete "bucket" defaults
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store :: Remote -> Key -> AssociatedFile -> MeterUpdate -> Annex Bool
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store r k _f p = s3Action r False $ \(conn, bucket) ->
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sendAnnex k (void $ remove' r k) $ \src -> do
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ok <- s3Bool =<< storeHelper (conn, bucket) r k p src
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-- Store public URL to item in Internet Archive.
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when (ok && isIA (config r)) $
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setUrlPresent k (iaKeyUrl r k)
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return ok
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storeEncrypted :: Remote -> (Cipher, Key) -> Key -> MeterUpdate -> Annex Bool
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storeEncrypted r (cipher, enck) k p = s3Action r False $ \(conn, bucket) ->
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-- To get file size of the encrypted content, have to use a temp file.
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-- (An alternative would be chunking to to a constant size.)
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withTmp enck $ \tmp -> sendAnnex k (void $ remove' r enck) $ \src -> do
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liftIO $ encrypt (getGpgEncParams r) cipher (feedFile src) $
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readBytes $ L.writeFile tmp
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s3Bool =<< storeHelper (conn, bucket) r enck p tmp
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storeHelper :: (AWSConnection, Bucket) -> Remote -> Key -> MeterUpdate -> FilePath -> Annex (AWSResult ())
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storeHelper (conn, bucket) r k p file = do
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size <- maybe getsize (return . fromIntegral) $ keySize k
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meteredBytes (Just p) size $ \meterupdate ->
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liftIO $ withMeteredFile file meterupdate $ \content -> do
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-- size is provided to S3 so the whole content
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-- does not need to be buffered to calculate it
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let object = S3Object
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bucket (bucketFile r k) ""
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(("Content-Length", show size) : getXheaders (config r))
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content
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sendObject conn $
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setStorageClass (getStorageClass $ config r) object
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where
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getsize = liftIO $ fromIntegral . fileSize <$> getFileStatus file
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retrieve :: Remote -> Key -> AssociatedFile -> FilePath -> MeterUpdate -> Annex Bool
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retrieve r k _f d p = s3Action r False $ \(conn, bucket) ->
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metered (Just p) k $ \meterupdate -> do
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res <- liftIO $ getObject conn $ bucketKey r bucket k
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case res of
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Right o -> do
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liftIO $ meteredWriteFile meterupdate d $
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obj_data o
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return True
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Left e -> s3Warning e
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retrieveCheap :: Remote -> Key -> FilePath -> Annex Bool
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retrieveCheap _ _ _ = return False
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retrieveEncrypted :: Remote -> (Cipher, Key) -> Key -> FilePath -> MeterUpdate -> Annex Bool
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retrieveEncrypted r (cipher, enck) k d p = s3Action r False $ \(conn, bucket) ->
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metered (Just p) k $ \meterupdate -> do
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res <- liftIO $ getObject conn $ bucketKey r bucket enck
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case res of
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Right o -> liftIO $ decrypt cipher (\h -> meteredWrite meterupdate h $ obj_data o) $
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readBytes $ \content -> do
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L.writeFile d content
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return True
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Left e -> s3Warning e
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{- Internet Archive doesn't easily allow removing content.
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- While it may remove the file, there are generally other files
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- derived from it that it does not remove. -}
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remove :: Remote -> RemoteConfig -> Key -> Annex Bool
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remove r c k
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| isIA c = do
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warning "Cannot remove content from the Internet Archive"
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return False
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| otherwise = remove' r k
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remove' :: Remote -> Key -> Annex Bool
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remove' r k = s3Action r False $ \(conn, bucket) ->
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s3Bool =<< liftIO (deleteObject conn $ bucketKey r bucket k)
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checkPresent :: Remote -> Key -> Annex (Either String Bool)
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checkPresent r k = s3Action r noconn $ \(conn, bucket) -> do
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showAction $ "checking " ++ name r
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res <- liftIO $ getObjectInfo conn $ bucketKey r bucket k
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case res of
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Right _ -> return $ Right True
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Left (AWSError _ _) -> return $ Right False
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Left e -> return $ Left (s3Error e)
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where
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noconn = Left $ error "S3 not configured"
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s3Warning :: ReqError -> Annex Bool
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s3Warning e = do
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warning $ prettyReqError e
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return False
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s3Error :: ReqError -> a
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s3Error e = error $ prettyReqError e
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s3Bool :: AWSResult () -> Annex Bool
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s3Bool (Right _) = return True
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s3Bool (Left e) = s3Warning e
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s3Action :: Remote -> a -> ((AWSConnection, Bucket) -> Annex a) -> Annex a
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s3Action r noconn action = do
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let bucket = M.lookup "bucket" $ config r
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conn <- s3Connection (config r) (uuid r)
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case (bucket, conn) of
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(Just b, Just c) -> action (c, b)
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_ -> return noconn
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bucketFile :: Remote -> Key -> FilePath
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bucketFile r = munge . key2file
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where
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munge s = case M.lookup "mungekeys" c of
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Just "ia" -> iaMunge $ filePrefix c ++ s
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_ -> filePrefix c ++ s
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c = config r
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filePrefix :: RemoteConfig -> String
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filePrefix = M.findWithDefault "" "fileprefix"
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bucketKey :: Remote -> Bucket -> Key -> S3Object
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bucketKey r bucket k = S3Object bucket (bucketFile r k) "" [] L.empty
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{- Internet Archive limits filenames to a subset of ascii,
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- with no whitespace. Other characters are xml entity
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- encoded. -}
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iaMunge :: String -> String
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iaMunge = (>>= munge)
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where
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munge c
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| isAsciiUpper c || isAsciiLower c || isNumber c = [c]
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| c `elem` "_-.\"" = [c]
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| isSpace c = []
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| otherwise = "&" ++ show (ord c) ++ ";"
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genBucket :: RemoteConfig -> UUID -> Annex ()
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genBucket c u = do
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conn <- s3ConnectionRequired c u
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showAction "checking bucket"
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loc <- liftIO $ getBucketLocation conn bucket
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case loc of
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Right _ -> writeUUIDFile c u
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Left err@(NetworkError _) -> s3Error err
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Left (AWSError _ _) -> do
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showAction $ "creating bucket in " ++ datacenter
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res <- liftIO $ createBucketIn conn bucket datacenter
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case res of
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Right _ -> writeUUIDFile c u
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Left err -> s3Error err
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where
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bucket = fromJust $ getBucket c
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datacenter = fromJust $ M.lookup "datacenter" c
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{- Writes the UUID to an annex-uuid file within the bucket.
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-
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- If the file already exists in the bucket, it must match.
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-
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- Note that IA items do not get created by createBucketIn.
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- Rather, they are created the first time a file is stored in them.
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- So this also takes care of that.
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-}
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writeUUIDFile :: RemoteConfig -> UUID -> Annex ()
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writeUUIDFile c u = do
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conn <- s3ConnectionRequired c u
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go conn =<< liftIO (tryNonAsync $ getObject conn $ mkobject L.empty)
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where
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go _conn (Right (Right o)) = unless (obj_data o == uuidb) $
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error $ "This bucket is already in use by a different S3 special remote, with UUID: " ++ L.unpack (obj_data o)
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go conn _ = do
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let object = setStorageClass (getStorageClass c) (mkobject uuidb)
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either s3Error return =<< liftIO (sendObject conn object)
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file = filePrefix c ++ "annex-uuid"
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uuidb = L.pack $ fromUUID u
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bucket = fromJust $ getBucket c
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mkobject = S3Object bucket file "" (getXheaders c)
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s3ConnectionRequired :: RemoteConfig -> UUID -> Annex AWSConnection
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s3ConnectionRequired c u =
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maybe (error "Cannot connect to S3") return =<< s3Connection c u
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s3Connection :: RemoteConfig -> UUID -> Annex (Maybe AWSConnection)
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s3Connection c u = go =<< getRemoteCredPairFor "S3" c (AWS.creds u)
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where
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go Nothing = return Nothing
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go (Just (ak, sk)) = return $ Just $ AWSConnection host port ak sk
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host = fromJust $ M.lookup "host" c
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port = let s = fromJust $ M.lookup "port" c in
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case reads s of
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[(p, _)] -> p
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_ -> error $ "bad S3 port value: " ++ s
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getBucket :: RemoteConfig -> Maybe Bucket
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getBucket = M.lookup "bucket"
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getStorageClass :: RemoteConfig -> StorageClass
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getStorageClass c = case fromJust $ M.lookup "storageclass" c of
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"REDUCED_REDUNDANCY" -> REDUCED_REDUNDANCY
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_ -> STANDARD
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getXheaders :: RemoteConfig -> [(String, String)]
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getXheaders = filter isxheader . M.assocs
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where
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isxheader (h, _) = "x-amz-" `isPrefixOf` h
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{- Hostname to use for archive.org S3. -}
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iaHost :: HostName
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iaHost = "s3.us.archive.org"
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isIA :: RemoteConfig -> Bool
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isIA c = maybe False isIAHost (M.lookup "host" c)
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isIAHost :: HostName -> Bool
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isIAHost h = ".archive.org" `isSuffixOf` map toLower h
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iaItemUrl :: Bucket -> URLString
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iaItemUrl bucket = "http://archive.org/details/" ++ bucket
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iaKeyUrl :: Remote -> Key -> URLString
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iaKeyUrl r k = "http://archive.org/download/" ++ bucket ++ "/" ++ bucketFile r k
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where
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bucket = fromMaybe "" $ getBucket $ config r
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