Request: New bind property for route parameters (#973)

* bind route params

* rename to bindPathData

bind.go

@@ -39,6 +39,9 @@ func (b *DefaultBinder) Bind(i interface{}, c Context) (err error) {
 		}
 		return NewHTTPError(http.StatusBadRequest, "Request body can't be empty")
 	}
+	if err = b.bindPathData(i, c); err != nil {
+		return NewHTTPError(http.StatusBadRequest, err.Error())
+	}
 	ctype := req.Header.Get(HeaderContentType)
 	switch {
 	case strings.HasPrefix(ctype, MIMEApplicationJSON):
@@ -75,6 +78,19 @@ func (b *DefaultBinder) Bind(i interface{}, c Context) (err error) {
 	return
 }
 
+func (b *DefaultBinder) bindPathData(ptr interface{}, c Context) error {
+	m := make(map[string][]string)
+	for _, key := range c.ParamNames() {
+		m[key] = []string{c.Param(key)}
+	}
+	if len(m) >= 0 {
+		if err := b.bindData(ptr, m, "param"); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (b *DefaultBinder) bindData(ptr interface{}, data map[string][]string, tag string) error {
 	typ := reflect.TypeOf(ptr).Elem()
 	val := reflect.ValueOf(ptr).Elem()

bind_test.go

@@ -140,6 +140,23 @@ func TestBindForm(t *testing.T) {
 	assert.Error(t, err)
 }
 
+func TestBindRouteParam(t *testing.T) {
+	e := New()
+	r := strings.NewReader(userJSONOnlyName)
+	req := httptest.NewRequest(POST, "/", r)
+	req.Header.Set(HeaderContentType, MIMEApplicationJSON)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+	c.SetParamNames("id")
+	c.SetParamValues("5")
+	u := new(user)
+	err := c.Bind(u)
+	if assert.NoError(t, err) {
+		assert.Equal(t, 5, u.ID)
+		assert.Equal(t, "Jon Snow", u.Name)
+	}
+}
+
 func TestBindQueryParams(t *testing.T) {
 	e := New()
 	req := httptest.NewRequest(GET, "/?id=1&name=Jon+Snow", nil)

echo_test.go

@@ -18,13 +18,14 @@ import (
 
 type (
 	user struct {
-		ID   int    `json:"id" xml:"id" form:"id" query:"id"`
+		ID   int    `json:"id" xml:"id" form:"id" query:"id" param:"id"`
 		Name string `json:"name" xml:"name" form:"name" query:"name"`
 	}
 )
 
 const (
 	userJSON         = `{"id":1,"name":"Jon Snow"}`
+	userJSONOnlyName = `{"name":"Jon Snow"}`
 	userXML          = `<user><id>1</id><name>Jon Snow</name></user>`
 	userForm         = `id=1&name=Jon Snow`
 	invalidContent   = "invalid content"