package middleware import ( "bufio" "bytes" "io" "net" "net/http" "github.com/labstack/echo/v4" ) type ( // BodyDumpConfig defines the config for BodyDump middleware. BodyDumpConfig struct { // Skipper defines a function to skip middleware. Skipper Skipper // Handler receives request and response payload. // Required. Handler BodyDumpHandler } // BodyDumpHandler receives the request and response payload. BodyDumpHandler func(echo.Context, []byte, []byte) bodyDumpResponseWriter struct { io.Writer http.ResponseWriter } ) var ( // DefaultBodyDumpConfig is the default BodyDump middleware config. DefaultBodyDumpConfig = BodyDumpConfig{ Skipper: DefaultSkipper, } ) // BodyDump returns a BodyDump middleware. // // BodyDump middleware captures the request and response payload and calls the // registered handler. func BodyDump(handler BodyDumpHandler) echo.MiddlewareFunc { c := DefaultBodyDumpConfig c.Handler = handler return BodyDumpWithConfig(c) } // BodyDumpWithConfig returns a BodyDump middleware with config. // See: `BodyDump()`. func BodyDumpWithConfig(config BodyDumpConfig) echo.MiddlewareFunc { // Defaults if config.Handler == nil { panic("echo: body-dump middleware requires a handler function") } if config.Skipper == nil { config.Skipper = DefaultBodyDumpConfig.Skipper } return func(next echo.HandlerFunc) echo.HandlerFunc { return func(c echo.Context) (err error) { if config.Skipper(c) { return next(c) } // Request reqBody := []byte{} if c.Request().Body != nil { // Read reqBody, _ = io.ReadAll(c.Request().Body) } c.Request().Body = io.NopCloser(bytes.NewBuffer(reqBody)) // Reset // Response resBody := new(bytes.Buffer) mw := io.MultiWriter(c.Response().Writer, resBody) writer := &bodyDumpResponseWriter{Writer: mw, ResponseWriter: c.Response().Writer} c.Response().Writer = writer if err = next(c); err != nil { c.Error(err) } // Callback config.Handler(c, reqBody, resBody.Bytes()) return } } } func (w *bodyDumpResponseWriter) WriteHeader(code int) { w.ResponseWriter.WriteHeader(code) } func (w *bodyDumpResponseWriter) Write(b []byte) (int, error) { return w.Writer.Write(b) } func (w *bodyDumpResponseWriter) Flush() { w.ResponseWriter.(http.Flusher).Flush() } func (w *bodyDumpResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) { return w.ResponseWriter.(http.Hijacker).Hijack() }