Add customizable prefix in the path during upgrade request

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app/Main.hs

@@ -27,6 +27,7 @@ data WsTunnel = WsTunnel
   , restrictTo      :: String
   , verbose         :: Bool
   , quiet           :: Bool
+  , pathPrefix      :: String
   } deriving (Show, Data, Typeable)
 
 data WsServerInfo = WsServerInfo
@@ -52,6 +53,9 @@ cmdLine = WsTunnel
   , dynamicToRemote= def &= explicit &= name "D" &= name "dynamicToRemote" &= typ "[BIND:]PORT"
                          &= help "Listen on local and dynamically (with socks5 proxy) forwards traffic from remote" &= groupname "Client options"
   , udpMode        = def &= explicit &= name "u" &= name "udp" &= help "forward UDP traffic instead of TCP"
+  , pathPrefix     = def &= explicit &= name "upgradePathPrefix"
+                         &= help "Use a specific prefix that will show up in the http path in the upgrade request. Useful if you need to route requests server side but don't have vhosts"
+                         &= typ "String" &= groupname "Client options"
   , proxy          = def &= explicit &= name "p" &= name "httpProxy"
                          &= help "If set, will use this proxy to connect to the server" &= typ "USER:PASS@HOST:PORT"
   , wsTunnelServer = def &= argPos 0 &= typ "ws[s]://wstunnelServer[:port]"
@@ -122,7 +126,8 @@ parseProxyInfo str = do
 main :: IO ()
 main = do
   args <- getArgs
-  cfg <- if null args then withArgs ["--help"] (cmdArgs cmdLine) else cmdArgs cmdLine
+  cfg' <- if null args then withArgs ["--help"] (cmdArgs cmdLine) else cmdArgs cmdLine
+  let cfg = cfg' { pathPrefix = if pathPrefix cfg' == mempty then "wstunnel" else pathPrefix cfg' }
 
   let serverInfo = parseServerInfo (WsServerInfo False "" 0) (wsTunnelServer cfg)
   Logger.init (if quiet cfg then Logger.QUIET
@@ -146,6 +151,7 @@ main = do
                                       , protocol = if udpMode cfg then UDP else TCP
                                       , proxySetting = parseProxyInfo (proxy cfg)
                                       , useSocks = False
+                                      , upgradePrefix = pathPrefix cfg
                                       }
   else if not $ null (dynamicToRemote cfg)
     then let (TunnelInfo lHost lPort _ _) = parseTunnelInfo $ (dynamicToRemote cfg) ++ ":127.0.0.1:1212"
@@ -159,6 +165,7 @@ main = do
                                       , protocol = SOCKS5
                                       , proxySetting = parseProxyInfo (proxy cfg)
                                       , useSocks = True
+                                      , upgradePrefix = pathPrefix cfg
                                       }
   else return ()
 

src/Tunnel.hs

@@ -237,13 +237,13 @@ runServer useTLS = if useTLS then runTlsTunnelingServer else runTunnelingServer
 --  Commons
 --
 toPath :: TunnelSettings -> String
-toPath TunnelSettings{..} = "/" <> toLower (show $ if protocol == SOCKS5 then TCP else protocol) <> "/" <> destHost <> "/" <> show destPort
+toPath TunnelSettings{..} = "/" <> upgradePrefix <> "/" <> toLower (show $ if protocol == SOCKS5 then TCP else protocol) <> "/" <> destHost <> "/" <> show destPort
 
 fromPath :: ByteString -> Maybe (Protocol, ByteString, Int)
 fromPath path = let rets = BC.split '/' . BC.drop 1 $ path
   in do
-    guard (length rets == 3)
+    guard (length rets == 4)
-    let [protocol, h, prt] = rets
+    let [_, protocol, h, prt] = rets
     prt' <- readMay . BC.unpack $ prt :: Maybe Int
     proto <- readMay . toUpper . BC.unpack $ protocol :: Maybe Protocol
     return (proto, h, prt')

src/Types.hs

@@ -53,6 +53,7 @@ data TunnelSettings = TunnelSettings
   , protocol      :: Protocol
   , useTls        :: Bool
   , useSocks      :: Bool
+  , upgradePrefix :: String
   }
 
 instance Show TunnelSettings where