Merge branch 'master' into routegroup

.travis.yml

@@ -5,4 +5,7 @@ go:
   - 1.2
   - 1.3
   - 1.4
+  - 1.5
+  - 1.6
+  - 1.7
   - tip

router.go

@@ -138,13 +138,19 @@ type Router struct {
 	// handler.
 	HandleMethodNotAllowed bool
 
+	// If enabled, the router automatically replies to OPTIONS requests.
+	// Custom OPTIONS handlers take priority over automatic replies.
+	HandleOPTIONS bool
+
 	// Configurable http.Handler which is called when no matching route is
 	// found. If it is not set, http.NotFound is used.
 	NotFound http.Handler
 
 	// Configurable http.Handler which is called when a request
 	// cannot be routed and HandleMethodNotAllowed is true.
 	// If it is not set, http.Error with http.StatusMethodNotAllowed is used.
+	// The "Allow" header with allowed request methods is set before the handler
+	// is called.
 	MethodNotAllowed http.Handler
 
 	// Function to handle panics recovered from http handlers.
@@ -165,6 +171,7 @@ func New() *Router {
 		RedirectTrailingSlash:  true,
 		RedirectFixedPath:      true,
 		HandleMethodNotAllowed: true,
+		HandleOPTIONS:          true,
 	}
 }
 
@@ -290,15 +297,53 @@ func (r *Router) Lookup(method, path string) (Handle, Params, bool) {
 	return nil, nil, false
 }
 
+func (r *Router) allowed(path, reqMethod string) (allow string) {
+	if path == "*" { // server-wide
+		for method := range r.trees {
+			if method == "OPTIONS" {
+				continue
+			}
+
+			// add request method to list of allowed methods
+			if len(allow) == 0 {
+				allow = method
+			} else {
+				allow += ", " + method
+			}
+		}
+	} else { // specific path
+		for method := range r.trees {
+			// Skip the requested method - we already tried this one
+			if method == reqMethod || method == "OPTIONS" {
+				continue
+			}
+
+			handle, _, _ := r.trees[method].getValue(path)
+			if handle != nil {
+				// add request method to list of allowed methods
+				if len(allow) == 0 {
+					allow = method
+				} else {
+					allow += ", " + method
+				}
+			}
+		}
+	}
+	if len(allow) > 0 {
+		allow += ", OPTIONS"
+	}
+	return
+}
+
 // ServeHTTP makes the router implement the http.Handler interface.
 func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	if r.PanicHandler != nil {
 		defer r.recv(w, req)
 	}
 
-	if root := r.trees[req.Method]; root != nil {
-		path := req.URL.Path
+	path := req.URL.Path
 
+	if root := r.trees[req.Method]; root != nil {
 		if handle, ps, tsr := root.getValue(path); handle != nil {
 			handle(w, req, ps)
 			return
@@ -335,16 +380,19 @@ func (r *Router) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		}
 	}
 
-	// Handle 405
-	if r.HandleMethodNotAllowed {
-		for method := range r.trees {
-			// Skip the requested method - we already tried this one
-			if method == req.Method {
-				continue
+	if req.Method == "OPTIONS" {
+		// Handle OPTIONS requests
+		if r.HandleOPTIONS {
+			if allow := r.allowed(path, req.Method); len(allow) > 0 {
+				w.Header().Set("Allow", allow)
+				return
 			}
-
-			handle, _, _ := r.trees[method].getValue(req.URL.Path)
-			if handle != nil {
+		}
+	} else {
+		// Handle 405
+		if r.HandleMethodNotAllowed {
+			if allow := r.allowed(path, req.Method); len(allow) > 0 {
+				w.Header().Set("Allow", allow)
 				if r.MethodNotAllowed != nil {
 					r.MethodNotAllowed.ServeHTTP(w, req)
 				} else {

router_test.go

@@ -68,11 +68,11 @@ func TestRouter(t *testing.T) {
 }
 
 type handlerStruct struct {
-	handeled *bool
+	handled *bool
 }
 
 func (h handlerStruct) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	*h.handeled = true
+	*h.handled = true
 }
 
 func TestRouterAPI(t *testing.T) {
@@ -216,20 +216,127 @@ func TestRouterChaining(t *testing.T) {
 	}
 }
 
+func TestRouterOPTIONS(t *testing.T) {
+	handlerFunc := func(_ http.ResponseWriter, _ *http.Request, _ Params) {}
+
+	router := New()
+	router.POST("/path", handlerFunc)
+
+	// test not allowed
+	// * (server)
+	r, _ := http.NewRequest("OPTIONS", "*", nil)
+	w := httptest.NewRecorder()
+	router.ServeHTTP(w, r)
+	if !(w.Code == http.StatusOK) {
+		t.Errorf("OPTIONS handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	} else if allow := w.Header().Get("Allow"); allow != "POST, OPTIONS" {
+		t.Error("unexpected Allow header value: " + allow)
+	}
+
+	// path
+	r, _ = http.NewRequest("OPTIONS", "/path", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, r)
+	if !(w.Code == http.StatusOK) {
+		t.Errorf("OPTIONS handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	} else if allow := w.Header().Get("Allow"); allow != "POST, OPTIONS" {
+		t.Error("unexpected Allow header value: " + allow)
+	}
+
+	r, _ = http.NewRequest("OPTIONS", "/doesnotexist", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, r)
+	if !(w.Code == http.StatusNotFound) {
+		t.Errorf("OPTIONS handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	}
+
+	// add another method
+	router.GET("/path", handlerFunc)
+
+	// test again
+	// * (server)
+	r, _ = http.NewRequest("OPTIONS", "*", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, r)
+	if !(w.Code == http.StatusOK) {
+		t.Errorf("OPTIONS handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	} else if allow := w.Header().Get("Allow"); allow != "POST, GET, OPTIONS" && allow != "GET, POST, OPTIONS" {
+		t.Error("unexpected Allow header value: " + allow)
+	}
+
+	// path
+	r, _ = http.NewRequest("OPTIONS", "/path", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, r)
+	if !(w.Code == http.StatusOK) {
+		t.Errorf("OPTIONS handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	} else if allow := w.Header().Get("Allow"); allow != "POST, GET, OPTIONS" && allow != "GET, POST, OPTIONS" {
+		t.Error("unexpected Allow header value: " + allow)
+	}
+
+	// custom handler
+	var custom bool
+	router.OPTIONS("/path", func(w http.ResponseWriter, r *http.Request, _ Params) {
+		custom = true
+	})
+
+	// test again
+	// * (server)
+	r, _ = http.NewRequest("OPTIONS", "*", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, r)
+	if !(w.Code == http.StatusOK) {
+		t.Errorf("OPTIONS handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	} else if allow := w.Header().Get("Allow"); allow != "POST, GET, OPTIONS" && allow != "GET, POST, OPTIONS" {
+		t.Error("unexpected Allow header value: " + allow)
+	}
+	if custom {
+		t.Error("custom handler called on *")
+	}
+
+	// path
+	r, _ = http.NewRequest("OPTIONS", "/path", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, r)
+	if !(w.Code == http.StatusOK) {
+		t.Errorf("OPTIONS handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	}
+	if !custom {
+		t.Error("custom handler not called")
+	}
+}
+
 func TestRouterNotAllowed(t *testing.T) {
 	handlerFunc := func(_ http.ResponseWriter, _ *http.Request, _ Params) {}
 
 	router := New()
 	router.POST("/path", handlerFunc)
 
-	// Test not allowed
+	// test not allowed
 	r, _ := http.NewRequest("GET", "/path", nil)
 	w := httptest.NewRecorder()
 	router.ServeHTTP(w, r)
 	if !(w.Code == http.StatusMethodNotAllowed) {
 		t.Errorf("NotAllowed handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	} else if allow := w.Header().Get("Allow"); allow != "POST, OPTIONS" {
+		t.Error("unexpected Allow header value: " + allow)
+	}
+
+	// add another method
+	router.DELETE("/path", handlerFunc)
+	router.OPTIONS("/path", handlerFunc) // must be ignored
+
+	// test again
+	r, _ = http.NewRequest("GET", "/path", nil)
+	w = httptest.NewRecorder()
+	router.ServeHTTP(w, r)
+	if !(w.Code == http.StatusMethodNotAllowed) {
+		t.Errorf("NotAllowed handling failed: Code=%d, Header=%v", w.Code, w.Header())
+	} else if allow := w.Header().Get("Allow"); allow != "POST, DELETE, OPTIONS" && allow != "DELETE, POST, OPTIONS" {
+		t.Error("unexpected Allow header value: " + allow)
 	}
 
+	// test custom handler
 	w = httptest.NewRecorder()
 	responseText := "custom method"
 	router.MethodNotAllowed = http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
@@ -243,6 +350,9 @@ func TestRouterNotAllowed(t *testing.T) {
 	if w.Code != http.StatusTeapot {
 		t.Errorf("unexpected response code %d want %d", w.Code, http.StatusTeapot)
 	}
+	if allow := w.Header().Get("Allow"); allow != "POST, DELETE, OPTIONS" && allow != "DELETE, POST, OPTIONS" {
+		t.Error("unexpected Allow header value: " + allow)
+	}
 }
 
 func TestRouterNotFound(t *testing.T) {