Add PureJSON renderer (#694)

Closes #693

render/json_17.go

@@ -0,0 +1,28 @@
+// Copyright 2018 Gin Core Team.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+// +build go1.7
+
+package render
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin/json"
+)
+
+type PureJSON struct {
+	Data interface{}
+}
+
+func (r PureJSON) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+	encoder := json.NewEncoder(w)
+	encoder.SetEscapeHTML(false)
+	return encoder.Encode(r.Data)
+}
+
+func (r PureJSON) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, jsonContentType)
+}

render/render_17_test.go

@@ -0,0 +1,26 @@
+// Copyright 2018 Gin Core Team.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+// +build go1.7
+
+package render
+
+import (
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRenderPureJSON(t *testing.T) {
+	w := httptest.NewRecorder()
+	data := map[string]interface{}{
+		"foo":  "bar",
+		"html": "<b>",
+	}
+	err := (PureJSON{data}).Render(w)
+	assert.NoError(t, err)
+	assert.Equal(t, "{\"foo\":\"bar\",\"html\":\"<b>\"}\n", w.Body.String())
+	assert.Equal(t, "application/json; charset=utf-8", w.Header().Get("Content-Type"))
+}

render/render_test.go

@@ -52,7 +52,8 @@ func TestRenderMsgPack(t *testing.T) {
 func TestRenderJSON(t *testing.T) {
 	w := httptest.NewRecorder()
 	data := map[string]interface{}{
-		"foo": "bar",
+		"foo":  "bar",
+		"html": "<b>",
 	}
 
 	(JSON{data}).WriteContentType(w)
@@ -61,7 +62,7 @@ func TestRenderJSON(t *testing.T) {
 	err := (JSON{data}).Render(w)
 
 	assert.NoError(t, err)
-	assert.Equal(t, "{\"foo\":\"bar\"}", 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"))
 }