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|
{- Amazon S3 remotes.
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Remote.S3 (remote) where
import Control.Exception.Extensible (IOException)
import Network.AWS.AWSConnection
import Network.AWS.S3Object
import Network.AWS.S3Bucket
import Network.AWS.AWSResult
import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.Map as M
import Data.Maybe
import Control.Monad (when)
import Control.Monad.State (liftIO)
import System.Environment
import RemoteClass
import Types
import qualified GitRepo as Git
import qualified Annex
import UUID
import Messages
import Locations
import Config
import Remote.Special
import Remote.Encryptable
import Crypto
remote :: RemoteType Annex
remote = RemoteType {
typename = "S3",
enumerate = findSpecialRemotes "s3",
generate = gen,
setup = s3Setup
}
gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex (Remote Annex)
gen r u c = do
cst <- remoteCost r expensiveRemoteCost
return $ gen' r u c cst
gen' :: Git.Repo -> UUID -> Maybe RemoteConfig -> Int -> Remote Annex
gen' r u c cst =
encryptableRemote c
(storeEncrypted this)
(retrieveEncrypted this)
this
where
this = Remote {
uuid = u,
cost = cst,
name = Git.repoDescribe r,
storeKey = store this,
retrieveKeyFile = retrieve this,
removeKey = remove this,
hasKey = checkPresent this,
hasKeyCheap = False,
config = c
}
s3Setup :: UUID -> RemoteConfig -> Annex RemoteConfig
s3Setup u c = do
-- verify configuration is sane
c' <- encryptionSetup c
let fullconfig = M.union c' defaults
-- check bucket location to see if the bucket exists, and create it
let datacenter = fromJust $ M.lookup "datacenter" fullconfig
conn <- s3ConnectionRequired fullconfig
showNote "checking bucket"
loc <- liftIO $ getBucketLocation conn bucket
case loc of
Right _ -> return ()
Left err@(NetworkError _) -> s3Error err
Left (AWSError _ _) -> do
showNote $ "creating bucket in " ++ datacenter
res <- liftIO $ createBucketIn conn bucket datacenter
case res of
Right _ -> return ()
Left err -> s3Error err
gitConfigSpecialRemote u fullconfig "s3" "true"
return fullconfig
where
remotename = fromJust (M.lookup "name" c)
bucket = remotename ++ "-" ++ u
defaults = M.fromList
[ ("datacenter", "US")
, ("storageclass", "STANDARD")
, ("host", defaultAmazonS3Host)
, ("port", show defaultAmazonS3Port)
, ("bucket", bucket)
]
store :: Remote Annex -> Key -> Annex Bool
store r k = s3Action r False $ \(conn, bucket) -> do
content <- lazyKeyContent k
res <- liftIO $ storeHelper (conn, bucket) r k content
s3Bool res
storeEncrypted :: Remote Annex -> (Cipher, Key) -> Key -> Annex Bool
storeEncrypted r (cipher, enck) k = s3Action r False $ \(conn, bucket) -> do
content <- lazyKeyContent k
res <- liftIO $ withEncryptedContent cipher (return content) $ \s -> do
storeHelper (conn, bucket) r enck s
s3Bool res
lazyKeyContent :: Key -> Annex L.ByteString
lazyKeyContent k = do
g <- Annex.gitRepo
liftIO $ L.readFile $ gitAnnexLocation g k
storeHelper :: (AWSConnection, String) -> Remote Annex -> Key -> L.ByteString -> IO (AWSResult ())
storeHelper (conn, bucket) r k content = do
let object = setStorageClass storageclass $ bucketKey bucket k content
sendObject conn object
where
storageclass =
case fromJust $ M.lookup "storageclass" $ fromJust $ config r of
"REDUCED_REDUNDANCY" -> REDUCED_REDUNDANCY
_ -> STANDARD
retrieve :: Remote Annex -> Key -> FilePath -> Annex Bool
retrieve r k f = s3Action r False $ \(conn, bucket) -> do
res <- liftIO $ getObject conn $ bucketKey bucket k L.empty
case res of
Right o -> do
liftIO $ L.writeFile f $ obj_data o
return True
Left e -> s3Warning e
retrieveEncrypted :: Remote Annex -> (Cipher, Key) -> FilePath -> Annex Bool
retrieveEncrypted r (cipher, enck) f = s3Action r False $ \(conn, bucket) -> do
res <- liftIO $ getObject conn $ bucketKey bucket enck L.empty
case res of
Right o -> liftIO $
withDecryptedContent cipher (return $ obj_data o) $ \content -> do
L.writeFile f content
return True
Left e -> s3Warning e
remove :: Remote Annex -> Key -> Annex Bool
remove r k = s3Action r False $ \(conn, bucket) -> do
res <- liftIO $ deleteObject conn $ bucketKey bucket k L.empty
s3Bool res
checkPresent :: Remote Annex -> Key -> Annex (Either IOException Bool)
checkPresent r k = s3Action r noconn $ \(conn, bucket) -> do
showNote ("checking " ++ name r ++ "...")
res <- liftIO $ getObjectInfo conn $ bucketKey bucket k L.empty
case res of
Right _ -> return $ Right True
Left (AWSError _ _) -> return $ Right False
Left e -> return $ Left (s3Error e)
where
noconn = Left $ error "S3 not configured"
s3Warning :: ReqError -> Annex Bool
s3Warning e = do
warning $ prettyReqError e
return False
s3Error :: ReqError -> a
s3Error e = error $ prettyReqError e
s3Bool :: AWSResult () -> Annex Bool
s3Bool res = do
case res of
Right _ -> return True
Left e -> s3Warning e
s3ConnectionRequired :: RemoteConfig -> Annex AWSConnection
s3ConnectionRequired c = do
conn <- s3Connection c
case conn of
Nothing -> error "Cannot connect to S3"
Just conn' -> return conn'
s3Connection :: RemoteConfig -> Annex (Maybe AWSConnection)
s3Connection c = do
ak <- getEnvKey "AWS_ACCESS_KEY_ID"
sk <- getEnvKey "AWS_SECRET_ACCESS_KEY"
if (null ak || null sk)
then do
warning "Set both AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY to use S3"
return Nothing
else return $ Just $ AWSConnection host port ak sk
where
host = fromJust $ (M.lookup "host" c)
port = let s = fromJust $ (M.lookup "port" c) in
case reads s of
[(p, _)] -> p
_ -> error $ "bad S3 port value: " ++ s
getEnvKey s = liftIO $ catch (getEnv s) (const $ return "")
s3Action :: Remote Annex -> a -> ((AWSConnection, String) -> Annex a) -> Annex a
s3Action r noconn action = do
when (config r == Nothing) $
error $ "Missing configuration for special remote " ++ name r
let bucket = M.lookup "bucket" $ fromJust $ config r
conn <- s3Connection (fromJust $ config r)
case (bucket, conn) of
(Just b, Just c) -> action (c, b)
_ -> return noconn
bucketKey :: String -> Key -> L.ByteString -> S3Object
bucketKey bucket k content = S3Object bucket (show k) "" [] content
|
