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{- Web remotes.
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}

module Remote.Web (remote) where

import Common.Annex
import Types.Remote
import qualified Git
import qualified Git.Construct
import Annex.Content
import Config
import Logs.Web
import qualified Utility.Url as Url
import Types.Key

remote :: RemoteType
remote = RemoteType {
typename = "web",
enumerate = list,
generate = gen,
setup = error "not supported"
}

-- There is only one web remote, and it always exists.
-- (If the web should cease to exist, remove this module and redistribute
-- a new release to the survivors by carrier pigeon.)
list :: Annex [Git.Repo]
list = do
r <- liftIO $ Git.Construct.remoteNamed "web" Git.Construct.fromUnknown
return [r]

gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex Remote
gen r _ _ =
return Remote {
uuid = webUUID,
cost = expensiveRemoteCost,
name = Git.repoDescribe r,
storeKey = uploadKey,
retrieveKeyFile = downloadKey,
retrieveKeyFileCheap = downloadKeyCheap,
removeKey = dropKey,
hasKey = checkKey,
hasKeyCheap = False,
whereisKey = Just getUrls,
config = Nothing,
localpath = Nothing,
repo = r,
readonly = True,
remotetype = remote
}

downloadKey :: Key -> AssociatedFile -> FilePath -> Annex Bool
downloadKey key _file dest = get =<< getUrls key
where
get [] = do
warning "no known url"
return False
get urls = do
showOutput -- make way for download progress bar
downloadUrl urls dest

downloadKeyCheap :: Key -> FilePath -> Annex Bool
downloadKeyCheap _ _ = return False

uploadKey :: Key -> AssociatedFile -> Annex Bool
uploadKey _ _ = do
warning "upload to web not supported"
return False

dropKey :: Key -> Annex Bool
dropKey _ = do
warning "removal from web not supported"
return False

checkKey :: Key -> Annex (Either String Bool)
checkKey key = do
us <- getUrls key
if null us
then return $ Right False
else return . Right =<< checkKey' key us
checkKey' :: Key -> [URLString] -> Annex Bool
checkKey' key us = untilTrue us $ \u -> do
showAction $ "checking " ++ u
headers <- getHttpHeaders
liftIO $ Url.check u headers (keySize key)
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