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Add support for ModifyResponse to alter transmitting messages #38

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Add support for ModifyResponse to alter transmitting messages #38

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10 changes: 10 additions & 0 deletions websocketproxy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,11 @@ type WebsocketProxy struct {
// Dialer contains options for connecting to the backend WebSocket server.
// If nil, DefaultDialer is used.
Dialer *websocket.Dialer

// ModifyResponse allows modifying the websocket messages bidirectionally
// User assigned function will be called with the request, response and original message,
// and must return the modified message. If nil, the data is transmitted unaltered.
ModifyResponse func(*http.Request, *http.Response, []byte) []byte
}

// ProxyHandler returns a new http.Handler interface that reverse proxies the
Expand Down Expand Up @@ -191,6 +196,11 @@ func (w *WebsocketProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
dst.WriteMessage(websocket.CloseMessage, m)
break
}

if w.ModifyResponse != nil {
msg = w.ModifyResponse(req, resp, msg)
}

err = dst.WriteMessage(msgType, msg)
if err != nil {
errc <- err
Expand Down