// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
package render
import (
"bytes"
"fmt"
"html/template"
"net/http"
"github.com/gin-gonic/gin/internal/bytesconv"
"github.com/gin-gonic/gin/internal/json"
)
// JSON contains the given interface object.
// JSON包含给定的接口对象。
type JSON struct {
Data any
}
// IndentedJSON contains the given interface object.
// IndentedJSON包含给定的接口对象。
type IndentedJSON struct {
Data any
}
// SecureJSON contains the given interface object and its prefix.
// SecureJSON包含给定的接口对象及其前缀。
type SecureJSON struct {
Prefix string
Data any
}
// JsonpJSON contains the given interface object its callback.
// JsonpJSON包含给定的接口对象及其回调。
type JsonpJSON struct {
Callback string
Data any
}
// AsciiJSON contains the given interface object.
// AsciJSON包含给定的接口对象。
type AsciiJSON struct {
Data any
}
// PureJSON contains the given interface object.
// PureJSON包含给定的接口对象。
type PureJSON struct {
Data any
}
var (
jsonContentType = []string{"application/json; charset=utf-8"}
jsonpContentType = []string{"application/javascript; charset=utf-8"}
jsonASCIIContentType = []string{"application/json"}
)
// Render (JSON) writes data with custom ContentType.
// Render(JSON)使用自定义ContentType写入数据。
func (r JSON) Render(w http.ResponseWriter) error {
return WriteJSON(w, r.Data)
}
// WriteContentType (JSON) writes JSON ContentType.
// WriteContentType(JSON)写入JSON ContentType。
func (r JSON) WriteContentType(w http.ResponseWriter) {
writeContentType(w, jsonContentType)
}
// WriteJSON marshals the given interface object and writes it with custom ContentType.
// WriteJSON封送给定的接口对象,并使用自定义ContentType进行写入。
func WriteJSON(w http.ResponseWriter, obj any) error {
writeContentType(w, jsonContentType)
jsonBytes, err := json.Marshal(obj)
if err != nil {
return err
}
_, err = w.Write(jsonBytes)
return err
}
// Render (IndentedJSON) marshals the given interface object and writes it with custom ContentType.
// Render(IndentedJSON)封送给定的接口对象,并使用自定义ContentType进行写入。
func (r IndentedJSON) Render(w http.ResponseWriter) error {
r.WriteContentType(w)
jsonBytes, err := json.MarshalIndent(r.Data, "", " ")
if err != nil {
return err
}
_, err = w.Write(jsonBytes)
return err
}
// WriteContentType (IndentedJSON) writes JSON ContentType.
// WriteContentType (IndentedJSON) 写入 JSON ContentType.
func (r IndentedJSON) WriteContentType(w http.ResponseWriter) {
writeContentType(w, jsonContentType)
}
// Render (SecureJSON) marshals the given interface object and writes it with custom ContentType.
// Render(SecureJSON)封送给定的接口对象,并使用自定义ContentType进行写入。
func (r SecureJSON) Render(w http.ResponseWriter) error {
r.WriteContentType(w)
jsonBytes, err := json.Marshal(r.Data)
if err != nil {
return err
}
// if the jsonBytes is array values
// 如果jsonBytes是数组值
if bytes.HasPrefix(jsonBytes, bytesconv.StringToBytes("[")) && bytes.HasSuffix(jsonBytes,
bytesconv.StringToBytes("]")) {
if _, err = w.Write(bytesconv.StringToBytes(r.Prefix)); err != nil {
return err
}
}
_, err = w.Write(jsonBytes)
return err
}
// WriteContentType (SecureJSON) writes JSON ContentType.
// WriteContentType(SecureJSON)写入JSON ContentType。
func (r SecureJSON) WriteContentType(w http.ResponseWriter) {
writeContentType(w, jsonContentType)
}
// Render (JsonpJSON) marshals the given interface object and writes it and its callback with custom ContentType.
// Render(JsonpJSON)封送给定的接口对象,并使用自定义ContentType写入它及其回调。
func (r JsonpJSON) Render(w http.ResponseWriter) (err error) {
r.WriteContentType(w)
ret, err := json.Marshal(r.Data)
if err != nil {
return err
}
if r.Callback == "" {
_, err = w.Write(ret)
return err
}
callback := template.JSEscapeString(r.Callback)
if _, err = w.Write(bytesconv.StringToBytes(callback)); err != nil {
return err
}
if _, err = w.Write(bytesconv.StringToBytes("(")); err != nil {
return err
}
if _, err = w.Write(ret); err != nil {
return err
}
if _, err = w.Write(bytesconv.StringToBytes(");")); err != nil {
return err
}
return nil
}
// WriteContentType (JsonpJSON) writes Javascript ContentType.
// WriteContentType(JsonpJSON)编写Javascript ContentType。
func (r JsonpJSON) WriteContentType(w http.ResponseWriter) {
writeContentType(w, jsonpContentType)
}
// Render (AsciiJSON) marshals the given interface object and writes it with custom ContentType.
// Render(AsciJSON)封送给定的接口对象,并使用自定义ContentType进行写入。
func (r AsciiJSON) Render(w http.ResponseWriter) (err error) {
r.WriteContentType(w)
ret, err := json.Marshal(r.Data)
if err != nil {
return err
}
var buffer bytes.Buffer
for _, r := range bytesconv.BytesToString(ret) {
cvt := string(r)
if r >= 128 {
cvt = fmt.Sprintf("\\u%04x", int64(r))
}
buffer.WriteString(cvt)
}
_, err = w.Write(buffer.Bytes())
return err
}
// WriteContentType (AsciiJSON) writes JSON ContentType.
// WriteContentType(AsciJSON)写入JSON ContentType。
func (r AsciiJSON) WriteContentType(w http.ResponseWriter) {
writeContentType(w, jsonASCIIContentType)
}
// Render (PureJSON) writes custom ContentType and encodes the given interface object.
// Render(PureJSON)编写自定义ContentType并对给定的接口对象进行编码。
func (r PureJSON) Render(w http.ResponseWriter) error {
r.WriteContentType(w)
encoder := json.NewEncoder(w)
encoder.SetEscapeHTML(false)
return encoder.Encode(r.Data)
}
// WriteContentType (PureJSON) writes custom ContentType.
// WriteContentType(PureJSON)写入自定义ContentType。
func (r PureJSON) WriteContentType(w http.ResponseWriter) {
writeContentType(w, jsonContentType)
}
【Gin-v1.9.0源码阅读】render/json.go
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转载自blog.csdn.net/qq2942713658/article/details/131056129
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