Urls can now be claimed by remotes. This will allow creating, for example, a external special remote that handles magnet: and *.torrent urls.

Remote.hs

@@ -45,7 +45,8 @@ module Remote (
 	forceTrust,
 	logStatus,
 	checkAvailable,
-	isXMPPRemote
+	isXMPPRemote,
+	claimingUrl,
 ) where
 
 import qualified Data.Map as M
@@ -60,6 +61,7 @@ import Annex.UUID
 import Logs.UUID
 import Logs.Trust
 import Logs.Location hiding (logStatus)
+import Logs.Web
 import Remote.List
 import Config
 import Git.Types (RemoteName)
@@ -318,3 +320,12 @@ hasKey r k = either (Left  . show) Right <$> tryNonAsync (checkPresent r k)
 
 hasKeyCheap :: Remote -> Bool
 hasKeyCheap = checkPresentCheap
+
+{- The web special remote claims urls by default. -}
+claimingUrl :: URLString -> Annex Remote
+claimingUrl url = do
+	rs <- remoteList
+	let web = Prelude.head $ filter (\r -> uuid r == webUUID) rs
+	fromMaybe web <$> firstM checkclaim rs
+  where
+	checkclaim = maybe (pure False) (flip id url) . claimUrl