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{- # LANGUAGE OverloadedStrings # -}
-- | A light-weight, minimalistic reverse HTTP proxy.
module Keter.Proxy
( reverseProxy
, PortLookup
, HostList
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, reverseProxySsl
, setDir
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, TLSConfig
, TLSConfigNoDir
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) where
import Keter.Prelude ( ( ++ ) )
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import Prelude hiding ( ( ++ ) , FilePath )
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import Data.Conduit
import Data.Conduit.Network
import Data.ByteString ( ByteString )
import Keter.PortManager ( Port )
import qualified Data.ByteString.Lazy as L
import Blaze.ByteString.Builder ( fromByteString , toLazyByteString )
import Data.Monoid ( mconcat )
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import Keter.SSL
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import Network.HTTP.ReverseProxy ( rawProxyTo , ProxyDest ( ProxyDest ) )
import Control.Applicative ( ( <$> ) )
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-- | Mapping from virtual hostname to port number.
type PortLookup = ByteString -> IO ( Maybe Port )
type HostList = IO [ ByteString ]
reverseProxy :: ServerSettings -> PortLookup -> HostList -> IO ()
reverseProxy settings x = runTCPServer settings . withClient x
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reverseProxySsl :: TLSConfig -> PortLookup -> HostList -> IO ()
reverseProxySsl settings x = runTCPServerTLS settings . withClient x
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withClient :: PortLookup
-> HostList
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-> Application IO
withClient portLookup hostList =
rawProxyTo getDest
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where
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getDest headers = do
mport <- maybe ( return Nothing ) portLookup $ lookup " host " headers
case mport of
Nothing -> Left . toResponse <$> hostList
Just port -> return $ Right $ ProxyDest " 127.0.0.1 " port
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toResponse :: Monad m => [ ByteString ] -> Source m ByteString
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toResponse hosts =
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mapM_ yield $ L . toChunks $ toLazyByteString $ front ++ mconcat ( map go hosts ) ++ end
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where
front = fromByteString " HTTP/1.1 200 OK \ r \ n Content-Type: text/html; charset=utf-8 \ r \ n \ r \ n <html><head><title>Welcome to Keter</title></head><body><h1>Welcome to Keter</h1><p>You may access the following sites:</p><ul> "
end = fromByteString " </ul></body></html> "
go host = fromByteString " <li><a href= \ " http:// " ++ fromByteString host ++ fromByteString " / \ " > " ++
fromByteString host ++ fromByteString " </a></li> "
