81 lines
2.3 KiB
Haskell
81 lines
2.3 KiB
Haskell
{- xmpp client support
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-
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- Copyright 2012 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 Assistant.XMPP.Client where
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import Assistant.Common
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import Utility.SRV
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import Creds
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import Network.Protocol.XMPP
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import Network
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import Control.Concurrent
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import qualified Data.Text as T
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import Control.Exception (SomeException)
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{- Everything we need to know to connect to an XMPP server. -}
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data XMPPCreds = XMPPCreds
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{ xmppUsername :: T.Text
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, xmppPassword :: T.Text
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, xmppHostname :: HostName
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, xmppPort :: Int
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, xmppJID :: T.Text
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}
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deriving (Read, Show)
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connectXMPP :: XMPPCreds -> (JID -> XMPP a) -> IO [(HostPort, Either SomeException ())]
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connectXMPP c a = case parseJID (xmppJID c) of
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Nothing -> error "bad JID"
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Just jid -> connectXMPP' jid c a
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{- Do a SRV lookup, but if it fails, fall back to the cached xmppHostname. -}
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connectXMPP' :: JID -> XMPPCreds -> (JID -> XMPP a) -> IO [(HostPort, Either SomeException ())]
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connectXMPP' jid c a = reverse <$> (go [] =<< lookupSRV srvrecord)
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where
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srvrecord = mkSRVTcp "xmpp-client" $
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T.unpack $ strDomain $ jidDomain jid
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serverjid = JID Nothing (jidDomain jid) Nothing
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go l [] = do
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let h = xmppHostname c
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let p = PortNumber $ fromIntegral $ xmppPort c
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r <- run h p $ a jid
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return (r : l)
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go l ((h,p):rest) = do
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{- Try each SRV record in turn, until one connects,
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- at which point the MVar will be full. -}
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mv <- newEmptyMVar
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r <- run h p $ do
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liftIO $ putMVar mv ()
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a jid
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ifM (isEmptyMVar mv)
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( go (r : l) rest
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, return (r : l)
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)
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{- Async exceptions are let through so the XMPP thread can
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- be killed. -}
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run h p a' = do
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r <- tryNonAsync $
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runClientError (Server serverjid h p) jid
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(xmppUsername c) (xmppPassword c) (void a')
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return ((h, p), r)
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{- XMPP runClient, that throws errors rather than returning an Either -}
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runClientError :: Server -> JID -> T.Text -> T.Text -> XMPP a -> IO a
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runClientError s j u p x = either (error . show) return =<< runClient s j u p x
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getXMPPCreds :: Annex (Maybe XMPPCreds)
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getXMPPCreds = parse <$> readCacheCreds xmppCredsFile
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where
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parse s = readish =<< s
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setXMPPCreds :: XMPPCreds -> Annex ()
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setXMPPCreds creds = writeCacheCreds (show creds) xmppCredsFile
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xmppCredsFile :: FilePath
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xmppCredsFile = "xmpp"
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