module Network.Protocol.XMPP.Handle
( Handle (..)
, startTLS
, hPutBytes
, hGetBytes
) where
import Control.Monad (when)
import qualified Control.Monad.Error as E
import Control.Monad.Trans (liftIO)
import qualified Data.ByteString
import Data.ByteString (ByteString)
import qualified Data.ByteString.Lazy
import qualified Data.Text
import Data.Text (Text)
import qualified System.IO as IO
import qualified Network.Protocol.TLS.GNU as TLS
import Network.Protocol.XMPP.ErrorT
data Handle =
PlainHandle IO.Handle
| SecureHandle IO.Handle TLS.Session
liftTLS :: TLS.Session -> TLS.TLS a -> ErrorT Text IO a
liftTLS s = liftTLS' . TLS.runTLS s
liftTLS' :: IO (Either TLS.Error a) -> ErrorT Text IO a
liftTLS' io = do
eitherX <- liftIO io
case eitherX of
Left err -> E.throwError (Data.Text.pack (show err))
Right x -> return x
startTLS :: Handle -> ErrorT Text IO Handle
startTLS (SecureHandle _ _) = E.throwError "Can't start TLS on a secure handle"
startTLS (PlainHandle h) = liftTLS' $ TLS.runClient (TLS.handleTransport h) $ do
TLS.setPriority [TLS.X509]
TLS.setCredentials =<< TLS.certificateCredentials
TLS.handshake
SecureHandle h `fmap` TLS.getSession
hPutBytes :: Handle -> ByteString -> ErrorT Text IO ()
hPutBytes (PlainHandle h) = liftIO . Data.ByteString.hPut h
hPutBytes (SecureHandle _ s) = liftTLS s . TLS.putBytes . toLazy where
toLazy bytes = Data.ByteString.Lazy.fromChunks [bytes]
hGetBytes :: Handle -> Integer -> ErrorT Text IO ByteString
hGetBytes (PlainHandle h) n = liftIO (Data.ByteString.hGet h (fromInteger n))
hGetBytes (SecureHandle h s) n = liftTLS s $ do
pending <- TLS.checkPending
let wait = IO.hWaitForInput h ( 1) >> return ()
when (pending == 0) (liftIO wait)
lazy <- TLS.getBytes n
return (Data.ByteString.concat (Data.ByteString.Lazy.toChunks lazy))