Add methods for NotFound and MethodNotAllowed, add response.EmbeddedSetter

chirouter/wrapper.go

@@ -199,6 +199,15 @@ func (r *Wrapper) Trace(pattern string, handlerFn http.HandlerFunc) {
 	r.Method(http.MethodTrace, pattern, handlerFn)
 }
 
+// HandlerFunc prepares handler and returns its function.
+//
+// Can be used as input for NotFound, MethodNotAllowed.
+func (r *Wrapper) HandlerFunc(h http.Handler) http.HandlerFunc {
+	h = nethttp.WrapHandler(h, r.wraps...)
+
+	return h.ServeHTTP
+}
+
 func (r *Wrapper) resolvePattern(pattern string) string {
 	return r.basePattern + strings.ReplaceAll(pattern, "/*/", "/")
 }

chirouter/wrapper_test.go

@@ -51,7 +51,8 @@ func (h HandlerWithBar) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 }
 
 func TestNewWrapper(t *testing.T) {
-	r := chirouter.NewWrapper(chi.NewRouter()).With(func(handler http.Handler) http.Handler {
+	w := chirouter.NewWrapper(chi.NewRouter())
+	r := w.With(func(handler http.Handler) http.Handler {
 		return http.HandlerFunc(handler.ServeHTTP)
 	})
 
@@ -79,6 +80,8 @@ func TestNewWrapper(t *testing.T) {
 
 	r.Use(mw)
 
+	r.NotFound(r.(*chirouter.Wrapper).HandlerFunc(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {})))
+
 	r.Group(func(r chi.Router) {
 		r.Method(http.MethodPost,
 			"/baz/{id}/",
@@ -125,7 +128,7 @@ func TestNewWrapper(t *testing.T) {
 	}
 
 	assert.Equal(t, 14, handlersCnt)
-	assert.Equal(t, 21, totalCnt)
+	assert.Equal(t, 22, totalCnt)
 }
 
 func TestWrapper_Use_precedence(t *testing.T) {

request/middleware.go

@@ -32,7 +32,6 @@ func DecoderMiddleware(factory DecoderMaker) func(http.Handler) http.Handler {
 		)
 
 		if !nethttp.HandlerAs(handler, &setRequestDecoder) ||
-			!nethttp.HandlerAs(handler, &withRoute) ||
 			!nethttp.HandlerAs(handler, &withUseCase) ||
 			!usecase.As(withUseCase.UseCase(), &useCaseWithInput) {
 			return handler
@@ -45,7 +44,11 @@ func DecoderMiddleware(factory DecoderMaker) func(http.Handler) http.Handler {
 
 		input := useCaseWithInput.InputPort()
 		if input != nil {
-			method := withRoute.RouteMethod()
+			method := http.MethodPost // Default for handlers without method (for example NotFound handler).
+			if nethttp.HandlerAs(handler, &withRoute) {
+				method = withRoute.RouteMethod()
+			}
+
 			dec := factory.MakeDecoder(method, input, customMapping)
 			setRequestDecoder.SetRequestDecoder(dec)
 		}

response/encoder.go

@@ -17,6 +17,15 @@ import (
 	"github.com/swaggest/usecase/status"
 )
 
+type (
+	// Setter captures original http.ResponseWriter.
+	//
+	// Implement this interface on a pointer to your output structure to get access to http.ResponseWriter.
+	Setter interface {
+		SetResponseWriter(rw http.ResponseWriter)
+	}
+)
+
 // Encoder prepares and writes http response.
 type Encoder struct {
 	JSONWriter func(v interface{})
@@ -30,6 +39,7 @@ type Encoder struct {
 	unwrapInterface      bool
 
 	dynamicWithHeadersSetup bool
+	dynamicSetter           bool
 	dynamicETagged          bool
 	dynamicNoContent        bool
 }
@@ -187,6 +197,10 @@ func (h *Encoder) SetupOutput(output interface{}, ht *rest.HandlerTrait) {
 		h.dynamicWithHeadersSetup = true
 	}
 
+	if _, ok := output.(Setter); ok || h.unwrapInterface {
+		h.dynamicSetter = true
+	}
+
 	if _, ok := output.(rest.ETagged); ok || h.unwrapInterface {
 		h.dynamicETagged = true
 	}
@@ -504,6 +518,12 @@ func (h *Encoder) MakeOutput(w http.ResponseWriter, ht rest.HandlerTrait) interf
 		}
 	}
 
+	if h.dynamicSetter {
+		if setter, ok := output.(Setter); ok {
+			setter.SetResponseWriter(w)
+		}
+	}
+
 	return output
 }
 
@@ -550,3 +570,18 @@ func (w *writerWithHeaders) Write(data []byte) (int, error) {
 
 	return w.ResponseWriter.Write(data)
 }
+
+// EmbeddedSetter can capture http.ResponseWriter in your output structure.
+type EmbeddedSetter struct {
+	rw http.ResponseWriter
+}
+
+// SetResponseWriter implements Setter.
+func (e *EmbeddedSetter) SetResponseWriter(rw http.ResponseWriter) {
+	e.rw = rw
+}
+
+// ResponseWriter is an accessor.
+func (e *EmbeddedSetter) ResponseWriter() http.ResponseWriter {
+	return e.rw
+}

response/encoder_test.go

@@ -236,3 +236,67 @@ func TestEncoder_Writer_httpStatus(t *testing.T) {
 	e.WriteSuccessfulResponse(w, r, output, rest.HandlerTrait{})
 	assert.Equal(t, http.StatusCreated, w.Code)
 }
+
+func TestEmbeddedSetter_SetResponseWriter(t *testing.T) {
+	e := response.Encoder{}
+
+	type EmbeddedHeader struct {
+		Foo int    `header:"X-Foo" json:"-"`
+		Bar string `cookie:"bar" json:"-"`
+	}
+
+	type outputPort struct {
+		response.EmbeddedSetter
+		EmbeddedHeader
+		Name    string   `header:"X-Name" json:"-"`
+		Items   []string `json:"items"`
+		Cookie  int      `cookie:"coo,httponly,path=/foo" json:"-"`
+		Cookie2 bool     `cookie:"coo2,httponly,secure,samesite=lax,path=/foo,max-age=86400" json:"-"`
+	}
+
+	ht := rest.HandlerTrait{
+		SuccessContentType: "application/x-vnd-json",
+	}
+
+	validator := jsonschema.Validator{}
+	require.NoError(t, validator.AddSchema(
+		rest.ParamInHeader,
+		"X-Name",
+		[]byte(`{"type":"string","minLength":3}`),
+		false),
+	)
+
+	ht.RespValidator = &validator
+
+	e.SetupOutput(outputPort{}, &ht)
+
+	r, err := http.NewRequest(http.MethodGet, "/", nil)
+	require.NoError(t, err)
+
+	w := httptest.NewRecorder()
+	output := e.MakeOutput(w, ht)
+
+	out, ok := output.(*outputPort)
+	assert.True(t, ok)
+
+	out.Foo = 321
+	out.Bar = "baz"
+	out.Name = "Jane"
+	out.Items = []string{"one", "two", "three"}
+	out.Cookie = 123
+	out.Cookie2 = true
+
+	e.WriteSuccessfulResponse(w, r, output, ht)
+	assert.Equal(t, http.StatusOK, w.Code)
+	assert.Equal(t, "Jane", w.Header().Get("X-Name"))
+	assert.Equal(t, "321", w.Header().Get("X-Foo"))
+	assert.Equal(t, []string{
+		"bar=baz",
+		"coo=123; Path=/foo; HttpOnly",
+		"coo2=true; Path=/foo; Max-Age=86400; HttpOnly; Secure; SameSite=Lax",
+	}, w.Header()["Set-Cookie"])
+	assert.Equal(t, "application/x-vnd-json", w.Header().Get("Content-Type"))
+	assert.Equal(t, "32", w.Header().Get("Content-Length"))
+	assert.Equal(t, `{"items":["one","two","three"]}`+"\n", w.Body.String())
+	assert.Equal(t, w, out.ResponseWriter())
+}

web/service.go

@@ -162,6 +162,16 @@ func (s *Service) Trace(pattern string, uc usecase.Interactor, options ...func(h
 	s.Method(http.MethodTrace, pattern, nethttp.NewHandler(uc, options...))
 }
 
+// OnNotFound registers usecase interactor as a handler for not found conditions.
+func (s *Service) OnNotFound(uc usecase.Interactor, options ...func(h *nethttp.Handler)) {
+	s.NotFound(s.HandlerFunc(nethttp.NewHandler(uc, options...)))
+}
+
+// OnMethodNotAllowed registers usecase interactor as a handler for method not allowed conditions.
+func (s *Service) OnMethodNotAllowed(uc usecase.Interactor, options ...func(h *nethttp.Handler)) {
+	s.MethodNotAllowed(s.HandlerFunc(nethttp.NewHandler(uc, options...)))
+}
+
 // Docs adds the route `pattern` that serves API documentation with Swagger UI.
 //
 // Swagger UI should be provided by `swgui` handler constructor, you can use one of these functions

web/service_test.go

@@ -56,6 +56,26 @@ func TestDefaultService(t *testing.T) {
 		return http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {})
 	})
 
+	service.OnNotFound(usecase.NewIOI(
+		nil,
+		new(struct {
+			Foo string `json:"foo"`
+		}),
+		func(ctx context.Context, input, output interface{}) error {
+			return nil
+		}),
+	)
+
+	service.OnMethodNotAllowed(usecase.NewIOI(
+		nil,
+		new(struct {
+			Foo string `json:"foo"`
+		}),
+		func(ctx context.Context, input, output interface{}) error {
+			return nil
+		}),
+	)
+
 	rw := httptest.NewRecorder()
 	r, err := http.NewRequest(http.MethodGet, "http://localhost/docs/openapi.json", nil)
 	require.NoError(t, err)