summaryrefslogtreecommitdiff
path: root/Remote/S3real.hs
blob: 40d7d905d570196e3233b5ded0ccf0157c70a505 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
{- 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 Network.AWS.AWSConnection
import Network.AWS.S3Object
import Network.AWS.S3Bucket hiding (size)
import Network.AWS.AWSResult
import qualified Data.ByteString.Lazy.Char8 as L
import qualified Data.Map as M
import Data.Char
import System.Environment
import System.Posix.Env (setEnv)

import Common.Annex
import Types.Remote
import Types.Key
import qualified Git
import Logs.UUID
import Config
import Remote.Helper.Special
import Remote.Helper.Encryptable
import Crypto
import Annex.Content
import Utility.Base64

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,
			repo = r
		}

s3Setup :: UUID -> RemoteConfig -> Annex RemoteConfig
s3Setup u c = handlehost $ M.lookup "host" c
	where
		remotename = fromJust (M.lookup "name" c)
		defbucket = remotename ++ "-" ++ u
		defaults = M.fromList
			[ ("datacenter", "US")
			, ("storageclass", "STANDARD")
			, ("host", defaultAmazonS3Host)
			, ("port", show defaultAmazonS3Port)
			, ("bucket", defbucket)
			]
		
		handlehost Nothing = defaulthost
		handlehost (Just h)
			| ".archive.org" `isSuffixOf` map toLower h = archiveorg
			| otherwise = defaulthost

		use fullconfig = do
			gitConfigSpecialRemote u fullconfig "s3" "true"
			s3SetCreds fullconfig	

		defaulthost = do
			c' <- encryptionSetup c
			let fullconfig = c' `M.union` defaults
			genBucket fullconfig
			use fullconfig

		archiveorg = do
			showNote "Internet Archive mode"
			maybe (error "specify bucket=") (const $ return ()) $
				M.lookup "bucket" archiveconfig
			use archiveconfig
			where
				archiveconfig =
					-- hS3 does not pass through
					-- x-archive-* headers
					M.mapKeys (replace "x-archive-" "x-amz-") $
					-- encryption does not make sense here
					M.insert "encryption" "none" $
					M.union c $
					-- special constraints on key names
					M.insert "mungekeys" "ia" $
					-- bucket created only when files
					-- are uploaded
					M.insert "x-amz-auto-make-bucket" "1" $
					-- no default bucket name; should
					-- be human-readable
					M.delete "bucket" defaults

store :: Remote Annex -> Key -> Annex Bool
store r k = s3Action r False $ \(conn, bucket) -> do
	g <- gitRepo
	res <- liftIO $ storeHelper (conn, bucket) r k $ gitAnnexLocation g k
	s3Bool res

storeEncrypted :: Remote Annex -> (Cipher, Key) -> Key -> Annex Bool
storeEncrypted r (cipher, enck) k = s3Action r False $ \(conn, bucket) -> 
	-- To get file size of the encrypted content, have to use a temp file.
	-- (An alternative would be chunking to to a constant size.)
	withTmp enck $ \tmp -> do
		g <- gitRepo
		let f = gitAnnexLocation g k
		liftIO $ withEncryptedContent cipher (L.readFile f) $ \s -> L.writeFile tmp s
		res <- liftIO $ storeHelper (conn, bucket) r enck tmp
		s3Bool res

storeHelper :: (AWSConnection, String) -> Remote Annex -> Key -> FilePath -> IO (AWSResult ())
storeHelper (conn, bucket) r k file = do
	content <- liftIO $ L.readFile file
	-- size is provided to S3 so the whole content does not need to be
	-- buffered to calculate it
	size <- maybe getsize (return . fromIntegral) $ keySize k
	let object = setStorageClass storageclass $ 
		S3Object bucket (bucketFile r k) ""
			(("Content-Length", show size) : xheaders) content
	sendObject conn object
	where
		storageclass =
			case fromJust $ M.lookup "storageclass" $ fromJust $ config r of
				"REDUCED_REDUNDANCY" -> REDUCED_REDUNDANCY
				_ -> STANDARD
		getsize = do
			s <- liftIO $ getFileStatus file
			return $ fileSize s
		
		xheaders = filter isxheader $ M.assocs $ fromJust $ config r
		isxheader (h, _) = "x-amz-" `isPrefixOf` h

retrieve :: Remote Annex -> Key -> FilePath -> Annex Bool
retrieve r k f = s3Action r False $ \(conn, bucket) -> do
	res <- liftIO $ getObject conn $ bucketKey r bucket k
	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 r bucket enck
	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 r bucket k
	s3Bool res

checkPresent :: Remote Annex -> Key -> Annex (Either IOException Bool)
checkPresent r k = s3Action r noconn $ \(conn, bucket) -> do
	showAction $ "checking " ++ name r
	res <- liftIO $ getObjectInfo conn $ bucketKey r bucket k
	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 (Right _) = return True
s3Bool (Left e) = s3Warning e

s3Action :: Remote Annex -> a -> ((AWSConnection, String) -> Annex a) -> Annex a
s3Action r noconn action = do
	when (isNothing $ config r) $
		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

bucketFile :: Remote Annex -> Key -> FilePath
bucketFile r = munge . show
	where
		munge s = case M.lookup "mungekeys" $ fromJust $ config r of
			Just "ia" -> iaMunge s
			_ -> s

bucketKey :: Remote Annex -> String -> Key -> S3Object
bucketKey r bucket k = S3Object bucket (bucketFile r k) "" [] L.empty

{- Internet Archive limits filenames to a subset of ascii,
 - with no whitespace. Other characters are xml entity
 - encoded. -}
iaMunge :: String -> String
iaMunge = (>>= munge)
	where
		munge c
			| isAsciiUpper c || isAsciiLower c || isNumber c = [c]
			| c `elem` "_-.\"" = [c]
			| isSpace c = []
			| otherwise = "&" ++ show (ord c) ++ ";"

genBucket :: RemoteConfig -> Annex ()
genBucket c = do
	conn <- s3ConnectionRequired c
	showAction "checking bucket"
	loc <- liftIO $ getBucketLocation conn bucket 
	case loc of
		Right _ -> return ()
		Left err@(NetworkError _) -> s3Error err
		Left (AWSError _ _) -> do
			showAction $ "creating bucket in " ++ datacenter
			res <- liftIO $ createBucketIn conn bucket datacenter
			case res of
				Right _ -> return ()
				Left err -> s3Error err
	where
		bucket = fromJust $ M.lookup "bucket" c
		datacenter = fromJust $ M.lookup "datacenter" c

s3ConnectionRequired :: RemoteConfig -> Annex AWSConnection
s3ConnectionRequired c =
	maybe (error "Cannot connect to S3") return =<< s3Connection c

s3Connection :: RemoteConfig -> Annex (Maybe AWSConnection)
s3Connection c = do
	creds <- s3GetCreds c
	case creds of
		Just (ak, sk) -> return $ Just $ AWSConnection host port ak sk
		_ -> do
			warning $ "Set both " ++ s3AccessKey ++ " and " ++ s3SecretKey  ++ " to use S3"
			return Nothing
	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

{- S3 creds come from the environment if set. 
 - Otherwise, might be stored encrypted in the remote's config. -}
s3GetCreds :: RemoteConfig -> Annex (Maybe (String, String))
s3GetCreds c = do
	ak <- getEnvKey s3AccessKey
	sk <- getEnvKey s3SecretKey
	if null ak || null sk
		then do
			mcipher <- remoteCipher c
			case (M.lookup "s3creds" c, mcipher) of
				(Just encrypted, Just cipher) -> do
					s <- liftIO $ withDecryptedContent cipher
						(return $ L.pack $ fromB64 encrypted)
						(return . L.unpack)
					let [ak', sk', _rest] = lines s
					liftIO $ do
						setEnv s3AccessKey ak True
						setEnv s3SecretKey sk True
					return $ Just (ak', sk')
				_ -> return Nothing
		else return $ Just (ak, sk)
	where
		getEnvKey s = liftIO $ catch (getEnv s) (const $ return "")

{- Stores S3 creds encrypted in the remote's config if possible. -}
s3SetCreds :: RemoteConfig -> Annex RemoteConfig
s3SetCreds c = do
	creds <- s3GetCreds c
	case creds of
		Just (ak, sk) -> do
			mcipher <- remoteCipher c
			case mcipher of
				Just cipher -> do
					s <- liftIO $ withEncryptedContent cipher
						(return $ L.pack $ unlines [ak, sk])
						(return . L.unpack)
					return $ M.insert "s3creds" (toB64 s) c
				Nothing -> return c
		_ -> return c

s3AccessKey :: String
s3AccessKey = "AWS_ACCESS_KEY_ID"
s3SecretKey :: String
s3SecretKey = "AWS_SECRET_ACCESS_KEY"