webapp: S3 and Glacier forms now have a select list of all currently-supported AWS regions.

Remote/Helper/AWS.hs

@@ -5,11 +5,16 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
+{-# LANGUAGE OverloadedStrings, TupleSections #-}
+
 module Remote.Helper.AWS where
 
 import Common.Annex
 import Creds
 
+import qualified Data.Map as M
+import Data.Text (Text)
+
 creds :: UUID -> CredPairStorage
 creds u = CredPairStorage
 	{ credPairFile = fromUUID u
@@ -19,3 +24,43 @@ creds u = CredPairStorage
 
 setCredsEnv :: CredPair -> IO ()
 setCredsEnv p = setEnvCredPair p $ creds undefined
+
+data Service = S3 | Glacier
+	deriving (Eq)
+
+type Region = Text
+
+regionMap :: Service -> M.Map Text Region
+regionMap = M.fromList . regionInfo
+
+defaultRegion :: Service -> Region
+defaultRegion = snd . Prelude.head . regionInfo
+
+{- S3 and Glacier use different names for some regions. Ie, "us-east-1"
+ - cannot be used with S3, while "US" cannot be used with Glacier. Dunno why.
+ - Also, Glacier is not yet available in all regions. -}
+regionInfo :: Service -> [(Text, Region)]
+regionInfo service = map (\(t, r) -> (t, fromServiceRegion r)) $ 
+	filter (matchingService . snd) $
+	concatMap (\(t, l) -> map (t,) l) regions
+  where
+	regions =
+		[ ("US East (N. Virginia)", [S3Region "US", GlacierRegion "us-east-1"])
+		, ("US West (Oregon)", [BothRegion "us-west-2"])
+		, ("US West (N. California)", [BothRegion "us-west-1"])
+		, ("EU (Ireland)", [S3Region "EU", GlacierRegion "eu-west-1"])
+		, ("Asia Pacific (Singapore)", [S3Region "ap-southeast-1"])
+		, ("Asia Pacific (Tokyo)", [BothRegion "ap-northeast-1"])
+		, ("Asia Pacific (Sydney)", [S3Region "ap-southeast-2"])
+		, ("South America (São Paulo)", [S3Region "sa-east-1"])
+		]
+
+	fromServiceRegion (BothRegion s) = s
+	fromServiceRegion (S3Region s) = s
+	fromServiceRegion (GlacierRegion s) = s
+
+	matchingService (BothRegion _) = True
+	matchingService (S3Region _) = service == S3
+	matchingService (GlacierRegion _) = service == Glacier
+
+data ServiceRegion = BothRegion Region | S3Region Region | GlacierRegion Region