134 lines
3.3 KiB
Haskell
134 lines
3.3 KiB
Haskell
{- Web remotes.
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-
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- Copyright 2011 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Remote.Web (
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remote,
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setUrl,
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download
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) where
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import Control.Monad.State (liftIO)
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import Control.Exception
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import System.FilePath
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import Network.Browser
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import Network.HTTP
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import Network.URI
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import Types
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import Types.Remote
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import qualified Git
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import qualified Annex
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import Messages
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import Utility
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import UUID
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import Config
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import PresenceLog
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import LocationLog
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import Locations
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type URLString = String
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remote :: RemoteType Annex
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remote = RemoteType {
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typename = "web",
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enumerate = list,
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generate = gen,
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setup = error "not supported"
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}
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-- There is only one web remote, and it always exists.
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-- (If the web should cease to exist, remove this module and redistribute
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-- a new release to the survivors by carrier pigeon.)
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list :: Annex [Git.Repo]
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list = return [Git.repoRemoteNameSet Git.repoFromUnknown "remote.web.dummy"]
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-- Dummy uuid for the whole web. Do not alter.
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webUUID :: UUID
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webUUID = "00000000-0000-0000-0000-000000000001"
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gen :: Git.Repo -> UUID -> Maybe RemoteConfig -> Annex (Remote Annex)
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gen r _ _ =
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return Remote {
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uuid = webUUID,
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cost = expensiveRemoteCost,
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name = Git.repoDescribe r,
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storeKey = uploadKey,
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retrieveKeyFile = downloadKey,
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removeKey = dropKey,
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hasKey = checkKey,
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hasKeyCheap = False,
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config = Nothing
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}
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{- The urls for a key are stored in remote/web/hash/key.log
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- in the git-annex branch. -}
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urlLog :: Key -> FilePath
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urlLog key = "remote/web" </> hashDirLower key </> show key ++ ".log"
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getUrls :: Key -> Annex [URLString]
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getUrls key = currentLog (urlLog key)
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{- Records a change in an url for a key. -}
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setUrl :: Key -> URLString -> LogStatus -> Annex ()
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setUrl key url status = do
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g <- Annex.gitRepo
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addLog (urlLog key) =<< logNow status url
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-- update location log to indicate that the web has the key, or not
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us <- getUrls key
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logChange g key webUUID (if null us then InfoMissing else InfoPresent)
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downloadKey :: Key -> FilePath -> Annex Bool
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downloadKey key file = do
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us <- getUrls key
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download us file
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uploadKey :: Key -> Annex Bool
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uploadKey _ = do
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warning "upload to web not supported"
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return False
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dropKey :: Key -> Annex Bool
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dropKey _ = do
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warning "removal from web not supported"
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return False
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checkKey :: Key -> Annex (Either IOException Bool)
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checkKey key = do
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us <- getUrls key
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if null us
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then return $ Right False
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else return . Right =<< checkKey' us
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checkKey' :: [URLString] -> Annex Bool
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checkKey' [] = return False
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checkKey' (u:us) = do
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showNote ("checking " ++ u)
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e <- liftIO $ urlexists u
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if e then return e else checkKey' us
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urlexists :: URLString -> IO Bool
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urlexists url =
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case parseURI url of
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Nothing -> return False
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Just u -> do
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(_, r) <- Network.Browser.browse $ do
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setErrHandler ignore
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setOutHandler ignore
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setAllowRedirects True
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request (mkRequest HEAD u :: Request_String)
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case rspCode r of
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(2,_,_) -> return True
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_ -> return False
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where
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ignore = const $ return ()
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download :: [URLString] -> FilePath -> Annex Bool
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download [] _ = return False
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download (url:us) file = do
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showProgress -- make way for curl progress bar
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ok <- liftIO $ boolSystem "curl" [Params "-L -C - -# -o", File file, File url]
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if ok then return ok else download us file
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