Use json marshall in context json to fix breaking new line issue. Fixes #2209 (#2228)

* ignore IntelliJ idea generated files

* update JSON renderer to use Marshall() instead of Encode(). Fix #2209

* Revert "ignore IntelliJ idea generated files"

This reverts commit e7bd017227df5dbd2ed2f5fe353adb5f1b08c678.

Co-authored-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Co-authored-by: thinkerou <thinkerou@gmail.com>

context_test.go

@@ -662,7 +662,7 @@ func TestContextRenderJSON(t *testing.T) {
 	c.JSON(http.StatusCreated, H{"foo": "bar", "html": "<b>"})
 
 	assert.Equal(t, http.StatusCreated, w.Code)
-	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"\\u003cb\\u003e\"}\n", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"\\u003cb\\u003e\"}", w.Body.String())
 	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
 }
 
@@ -690,7 +690,7 @@ func TestContextRenderJSONPWithoutCallback(t *testing.T) {
 	c.JSONP(http.StatusCreated, H{"foo": "bar"})
 
 	assert.Equal(t, http.StatusCreated, w.Code)
-	assert.Equal(t, "{\"foo\":\"bar\"}\n", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\"}", w.Body.String())
 	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
 }
 
@@ -716,7 +716,7 @@ func TestContextRenderAPIJSON(t *testing.T) {
 	c.JSON(http.StatusCreated, H{"foo": "bar"})
 
 	assert.Equal(t, http.StatusCreated, w.Code)
-	assert.Equal(t, "{\"foo\":\"bar\"}\n", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\"}", w.Body.String())
 	assert.Equal(t, "application/vnd.api+json", w.Header().Get("Content-Type"))
 }
 
@@ -1119,7 +1119,7 @@ func TestContextNegotiationWithJSON(t *testing.T) {
 	})
 
 	assert.Equal(t, http.StatusOK, w.Code)
-	assert.Equal(t, "{\"foo\":\"bar\"}\n", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\"}", w.Body.String())
 	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
 }
 
@@ -1283,7 +1283,7 @@ func TestContextAbortWithStatusJSON(t *testing.T) {
 	_, err := buf.ReadFrom(w.Body)
 	assert.NoError(t, err)
 	jsonStringBody := buf.String()
-	assert.Equal(t, fmt.Sprint("{\"foo\":\"fooValue\",\"bar\":\"barValue\"}\n"), jsonStringBody)
+	assert.Equal(t, fmt.Sprint("{\"foo\":\"fooValue\",\"bar\":\"barValue\"}"), jsonStringBody)
 }
 
 func TestContextError(t *testing.T) {

logger_test.go

@@ -369,15 +369,15 @@ func TestErrorLogger(t *testing.T) {
 
 	w := performRequest(router, "GET", "/error")
 	assert.Equal(t, http.StatusOK, w.Code)
-	assert.Equal(t, "{\"error\":\"this is an error\"}\n", w.Body.String())
+	assert.Equal(t, "{\"error\":\"this is an error\"}", w.Body.String())
 
 	w = performRequest(router, "GET", "/abort")
 	assert.Equal(t, http.StatusUnauthorized, w.Code)
-	assert.Equal(t, "{\"error\":\"no authorized\"}\n", w.Body.String())
+	assert.Equal(t, "{\"error\":\"no authorized\"}", w.Body.String())
 
 	w = performRequest(router, "GET", "/print")
 	assert.Equal(t, http.StatusInternalServerError, w.Code)
-	assert.Equal(t, "hola!{\"error\":\"this is an error\"}\n", w.Body.String())
+	assert.Equal(t, "hola!{\"error\":\"this is an error\"}", w.Body.String())
 }
 
 func TestLoggerWithWriterSkippingPaths(t *testing.T) {

middleware_test.go

@@ -246,5 +246,5 @@ func TestMiddlewareWrite(t *testing.T) {
 	w := performRequest(router, "GET", "/")
 
 	assert.Equal(t, http.StatusBadRequest, w.Code)
-	assert.Equal(t, strings.Replace("hola\n<map><foo>bar</foo></map>{\"foo\":\"bar\"}\n{\"foo\":\"bar\"}\nevent:test\ndata:message\n\n", " ", "", -1), strings.Replace(w.Body.String(), " ", "", -1))
+	assert.Equal(t, strings.Replace("hola\n<map><foo>bar</foo></map>{\"foo\":\"bar\"}{\"foo\":\"bar\"}event:test\ndata:message\n\n", " ", "", -1), strings.Replace(w.Body.String(), " ", "", -1))
 }

render/json.go

@@ -69,8 +69,11 @@ func (r JSON) WriteContentType(w http.ResponseWriter) {
 // WriteJSON marshals the given interface object and writes it with custom ContentType.
 func WriteJSON(w http.ResponseWriter, obj interface{}) error {
 	writeContentType(w, jsonContentType)
-	encoder := json.NewEncoder(w)
+	jsonBytes, err := json.Marshal(obj)
-	err := encoder.Encode(&obj)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(jsonBytes)
 	return err
 }
 

render/render_test.go

@@ -36,7 +36,7 @@ func TestRenderJSON(t *testing.T) {
 	err := (JSON{data}).Render(w)
 
 	assert.NoError(t, err)
-	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"\\u003cb\\u003e\"}\n", w.Body.String())
+	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"\\u003cb\\u003e\"}", w.Body.String())
 	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
 }