266 lines
7.9 KiB
Haskell
266 lines
7.9 KiB
Haskell
{- Amazon S3 remotes.
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-
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- Copyright 2011 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) where
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import Control.Exception.Extensible (IOException)
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import Network.AWS.AWSConnection
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import Network.AWS.S3Object
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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.ByteString.Lazy.Char8 as L
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import qualified Data.Map as M
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import Data.Maybe
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import Control.Monad (when)
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import Control.Monad.State (liftIO)
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import System.Environment
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import System.Posix.Files
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import System.Posix.Env (setEnv)
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import RemoteClass
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import Types
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import qualified GitRepo as Git
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import qualified Annex
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import UUID
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import Messages
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import Locations
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import Config
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import Remote.Special
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import Remote.Encryptable
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import Crypto
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import Key
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import Content
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import Base64
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remote :: RemoteType Annex
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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 -> Maybe RemoteConfig -> Annex (Remote Annex)
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gen r u c = do
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cst <- remoteCost r expensiveRemoteCost
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return $ gen' r u c cst
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gen' :: Git.Repo -> UUID -> Maybe RemoteConfig -> Int -> Remote Annex
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gen' r u c cst = do
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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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removeKey = remove this,
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hasKey = checkPresent this,
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hasKeyCheap = False,
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config = c
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}
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s3Setup :: UUID -> RemoteConfig -> Annex RemoteConfig
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s3Setup u c = do
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-- verify configuration is sane
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c' <- encryptionSetup c
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let fullconfig = M.union c' defaults
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-- check bucket location to see if the bucket exists, and create it
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let datacenter = fromJust $ M.lookup "datacenter" fullconfig
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conn <- s3ConnectionRequired fullconfig
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showNote "checking bucket"
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loc <- liftIO $ getBucketLocation conn bucket
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case loc of
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Right _ -> return ()
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Left err@(NetworkError _) -> s3Error err
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Left (AWSError _ _) -> do
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showNote $ "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 _ -> return ()
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Left err -> s3Error err
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gitConfigSpecialRemote u fullconfig "s3" "true"
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s3SetCreds fullconfig
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where
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remotename = fromJust (M.lookup "name" c)
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bucket = remotename ++ "-" ++ u
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defaults = M.fromList
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[ ("datacenter", "US")
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, ("storageclass", "STANDARD")
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, ("host", defaultAmazonS3Host)
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, ("port", show defaultAmazonS3Port)
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, ("bucket", bucket)
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]
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store :: Remote Annex -> Key -> Annex Bool
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store r k = s3Action r False $ \(conn, bucket) -> do
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g <- Annex.gitRepo
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res <- liftIO $ storeHelper (conn, bucket) r k $ gitAnnexLocation g k
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s3Bool res
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storeEncrypted :: Remote Annex -> (Cipher, Key) -> Key -> Annex Bool
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storeEncrypted r (cipher, enck) k = 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 -> do
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g <- Annex.gitRepo
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let f = gitAnnexLocation g k
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liftIO $ withEncryptedContent cipher (L.readFile f) $ \s -> L.writeFile tmp s
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res <- liftIO $ storeHelper (conn, bucket) r enck tmp
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s3Bool res
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storeHelper :: (AWSConnection, String) -> Remote Annex -> Key -> FilePath -> IO (AWSResult ())
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storeHelper (conn, bucket) r k file = do
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content <- liftIO $ L.readFile file
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-- size is provided to S3 so the whole content does not need to be
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-- buffered to calculate it
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size <- maybe getsize (return . fromIntegral) $ keySize k
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let object = setStorageClass storageclass $
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S3Object bucket (show k) ""
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[("Content-Length",(show size))] content
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sendObject conn object
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where
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storageclass =
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case fromJust $ M.lookup "storageclass" $ fromJust $ config r of
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"REDUCED_REDUNDANCY" -> REDUCED_REDUNDANCY
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_ -> STANDARD
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getsize = do
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s <- liftIO $ getFileStatus file
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return $ fileSize s
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retrieve :: Remote Annex -> Key -> FilePath -> Annex Bool
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retrieve r k f = s3Action r False $ \(conn, bucket) -> do
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res <- liftIO $ getObject conn $ bucketKey bucket k
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case res of
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Right o -> do
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liftIO $ L.writeFile f $ obj_data o
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return True
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Left e -> s3Warning e
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retrieveEncrypted :: Remote Annex -> (Cipher, Key) -> FilePath -> Annex Bool
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retrieveEncrypted r (cipher, enck) f = s3Action r False $ \(conn, bucket) -> do
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res <- liftIO $ getObject conn $ bucketKey bucket enck
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case res of
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Right o -> liftIO $
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withDecryptedContent cipher (return $ obj_data o) $ \content -> do
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L.writeFile f content
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return True
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Left e -> s3Warning e
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remove :: Remote Annex -> Key -> Annex Bool
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remove r k = s3Action r False $ \(conn, bucket) -> do
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res <- liftIO $ deleteObject conn $ bucketKey bucket k
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s3Bool res
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checkPresent :: Remote Annex -> Key -> Annex (Either IOException Bool)
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checkPresent r k = s3Action r noconn $ \(conn, bucket) -> do
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showNote ("checking " ++ name r ++ "...")
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res <- liftIO $ getObjectInfo conn $ bucketKey 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 res = do
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case res of
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Right _ -> return True
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Left e -> s3Warning e
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s3Action :: Remote Annex -> a -> ((AWSConnection, String) -> Annex a) -> Annex a
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s3Action r noconn action = do
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when (config r == Nothing) $
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error $ "Missing configuration for special remote " ++ name r
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let bucket = M.lookup "bucket" $ fromJust $ config r
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conn <- s3Connection $ fromJust $ config 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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bucketKey :: String -> Key -> S3Object
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bucketKey bucket k = S3Object bucket (show k) "" [] L.empty
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s3ConnectionRequired :: RemoteConfig -> Annex AWSConnection
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s3ConnectionRequired c =
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maybe (error "Cannot connect to S3") return =<< s3Connection c
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s3Connection :: RemoteConfig -> Annex (Maybe AWSConnection)
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s3Connection c = do
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creds <- s3GetCreds c
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case creds of
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Just (ak, sk) -> return $ Just $ AWSConnection host port ak sk
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_ -> do
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warning $ "Set both " ++ s3AccessKey ++ " and " ++ s3SecretKey ++ " to use S3"
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return Nothing
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where
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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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{- S3 creds come from the environment if set.
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- Otherwise, might be stored encrypted in the remote's config. -}
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s3GetCreds :: RemoteConfig -> Annex (Maybe (String, String))
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s3GetCreds c = do
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ak <- getEnvKey s3AccessKey
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sk <- getEnvKey s3SecretKey
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if (null ak || null sk)
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then do
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mcipher <- remoteCipher c
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case (M.lookup "s3creds" c, mcipher) of
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(Just encrypted, Just cipher) -> do
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s <- liftIO $ withDecryptedContent cipher
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(return $ L.pack $ fromB64 encrypted)
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(return . L.unpack)
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let line = lines s
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let ak' = line !! 0
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let sk' = line !! 1
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liftIO $ do
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setEnv s3AccessKey ak True
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setEnv s3SecretKey sk True
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return $ Just (ak', sk')
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_ -> return Nothing
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else return $ Just (ak, sk)
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where
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getEnvKey s = liftIO $ catch (getEnv s) (const $ return "")
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{- Stores S3 creds encrypted in the remote's config if possible. -}
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s3SetCreds :: RemoteConfig -> Annex RemoteConfig
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s3SetCreds c = do
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creds <- s3GetCreds c
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case creds of
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Just (ak, sk) -> do
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mcipher <- remoteCipher c
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case mcipher of
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Just cipher -> do
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s <- liftIO $ withEncryptedContent cipher
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(return $ L.pack $ unlines [ak, sk])
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(return . L.unpack)
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return $ M.insert "s3creds" (toB64 s) c
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Nothing -> return c
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_ -> return c
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s3AccessKey :: String
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s3AccessKey = "AWS_ACCESS_KEY_ID"
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s3SecretKey :: String
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s3SecretKey = "AWS_SECRET_ACCESS_KEY"
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