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Go language web development series 28: solve cross domain access of CORS with gin contrib / CORS

2022-07-03 13:48:00 【Lao Liu, you are so awesome】

One , Libraries used for installation

1,cors The base address :

2, Install... From the command line :

[email protected]:~$ go get -u github.com/gin-contrib/cors

explain ： Liu Hongdi's go The forest is a focus golang The blog of ,
Address ：https://blog.csdn.net/weixin_43881017

explain ： author : Liu Hongdi mailbox : [email protected]

Two , Information about the demonstration project

1, Address :

https://github.com/liuhongdi/digv28

2, Functional specifications ： demonstration gin The framework solves this problem by specifying the domain cors visit

3, Project structure : Pictured :

3、 ... and ,go Code instructions

1,controller/indexController.go

package controller

import (
	"fmt"
	"github.com/gin-gonic/gin"
	"github.com/liuhongdi/digv28/global"
	"time"
)

type IndexController struct{}
func NewIndexController() IndexController {
	return IndexController{}
}
// Return a successful prompt 
func (g *IndexController) Index(c *gin.Context) {
	fmt.Println("controller:index: "+time.Now().String())
	result := global.NewResult(c)
	result.Success("success");
	return
}

2,global/result.go

package global

import (
	"github.com/gin-gonic/gin"
	"net/http"
)

type Result struct {
	Ctx *gin.Context
}

type ResultCont struct {
	Code	int  `json:"code"` //  Self increasing 
	Msg string  `json:"msg"` //
	Data interface{} `json:"data"`
}

func NewResult(ctx *gin.Context) *Result {
	return &Result{Ctx: ctx}
}

// Return to success 
func (r *Result) Success(data interface{}) {
	if (data == nil) {
		data = gin.H{}
	}
	res := ResultCont{}
	res.Code = 0
	res.Msg = ""
	res.Data = data
	r.Ctx.JSON(http.StatusOK,res)
}

// Return failed 
func (r *Result)Error(code int,msg string) {
	res := ResultCont{}
	res.Code = code
	res.Msg = msg
	res.Data = gin.H{}
	r.Ctx.JSON(http.StatusOK,res)
	r.Ctx.Abort()
}

3,router/router.go

package router

import (
	"github.com/gin-contrib/cors"
	"github.com/gin-gonic/gin"
	"github.com/liuhongdi/digv28/controller"
	"github.com/liuhongdi/digv28/global"
	"log"
	"runtime/debug"
)

func Router() *gin.Engine {
	router := gin.Default()
	// Handling exceptions 
	router.NoRoute(HandleNotFound)
	router.NoMethod(HandleNotFound)
	router.Use(Recover)
	//cors
	config := cors.DefaultConfig()
	//config.AllowOrigins = []string{"http://127.0.0.1","http://google.com", "http://facebook.com"}
	config.AllowOrigins = []string{"http://google.com", "http://facebook.com"}
	router.Use(cors.New(config))

	//  Path mapping :index
	indexc:=controller.NewIndexController()
	router.GET("/index/index", indexc.Index);

	return router
}

func HandleNotFound(c *gin.Context) {
	global.NewResult(c).Error(404," Resource not found ")
	return
}

func Recover(c *gin.Context) {
	defer func() {
		if r := recover(); r != nil {
			// Print error stack information 
			log.Printf("panic: %v\n", r)
			debug.PrintStack()
			global.NewResult(c).Error(500," Server internal error ")
		}
	}()
	// Finished loading  defer recover, Continue with subsequent interface calls 
	c.Next()
}

4,static/page81.html

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title > title </title>
    <meta charset="utf-8" />
    <script type="text/javascript" language="JavaScript" src="jquery-1.6.2.min.js"></script>
</head>
<body>
<div id="content" style="width:800px;">
    <div style="width:250px;float:left;font-size: 16px;" ></div>
    <div style="width:550px;float:left;">
        <!--====================main begin=====================-->
        <a href="javascript:get_index()" > visit 8080:/index/index</a><br/>
        <!--====================main   end=====================-->
    </div>
</div>
<script>
    // visit 8080:/home/home
    function get_index(){
        $.ajax({
            type:"GET",
            url:"http://127.0.0.1:8080/index/index",
            // Return the format of the data 
            datatype: "text",//"xml", "html", "script", "json", "jsonp", "text".
            processData: false,
            contentType: false,
            // Base note function after successful return 
            success:function(data){
                alert(data);
                if (data.code == 0){
                    alert(" Successful visit ");
                } else {
                    alert(" error :"+data.msg);
                }
            },
            // Base note 
            complete: function(XMLHttpRequest, textStatus){
            },
            // Call the function executed in error 
            error:function(jqXHR,textStatus,errorThrown){
                console.log(jqXHR);
                console.log(textStatus);
                console.log(errorThrown);
            }
        });
    }
</script>
</body>
</html>

Four , The test results

1, No direct access across domains ：

visit :

http://127.0.0.1:8080/index/index

return :

2, Copy js/html To another domain

hold jquery-1.6.2.min.js and page81.html Copied to the nginx Under a virtual host , Use 80 port

3, Testing cross domain access :

http://127.0.0.1/page81.html

return :

Click the link and return :

4, Test cross domain failure ：

modify router/router.go in :

config.AllowOrigins = []string{"http://127.0.0.1","http://google.com", "http://facebook.com"}

Get rid of the "http://127.0.0.1",

Revisit :

No response after clicking the link ,
View the console and return to :

5、 ... and , View the version of the library :

module github.com/liuhongdi/digv28

go 1.15

require (
	github.com/gin-gonic/gin v1.6.3
	github.com/gin-contrib/cors v1.3.1
)

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本文为[Lao Liu, you are so awesome]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/02/202202150519439292.html