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golang login request

王林

Release： 2023-05-16 13:00:38

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With the continuous development of the Internet, more and more services require users to log in before they can be used, so the login function has become one of the functions that every web application must have. Using Golang to develop login functions can effectively improve operating efficiency and maintainability.

Golang (also known as Go) is an open source programming language developed by Google. Since its launch, it has been widely used for the development of web applications. Golang is efficient, cross-platform, and easy to get started. It is one of the preferred languages for developing high-concurrency web services.

In this article, we will introduce you how to use Golang to implement login requests. First, we'll cover the necessary steps to implement a login request. Then, we will give a specific example program so that you can better understand the methods and techniques of implementing login requests.

Steps to implement a login request

The steps to implement a login request mainly include:

Create a login interface.

The first step in the user login function is to create a login interface for entering username and password. Usually, the login interface consists of two text boxes: user name and password.

Get user login input.

In Golang, we can use web frameworks (such as Gin, Beego, etc.) to obtain the username and password entered by the user. The specific implementation method is to submit the form data to the server through POST, and the server can obtain the POST data through the Request object.

Validate user input.

After obtaining user input, the entered user name and password need to be verified. Usually, we will first compare whether the entered username and password correspond to those stored in the database. If they match, you can proceed to the next step; if they don't match, an error message is returned to the user.

Construct login request.

Once the user name and password entered by the user are verified, the server will generate a secure token for the user, which can identify the user and save the user's login status. After the token is generated, the server needs to structure it into a packet (such as JSON format) that can be sent to the client.

Send login request.

We can easily write code to send login requests through the official or third-party extension library in the http package or web framework. By sending a login request, the server sends the token to the client; after the client receives the token, it can save it and use it for subsequent operations.

Sample program

Below we will demonstrate the implementation of the above steps through a simple login request sample program. First, you need to create a simple HTML login page, including two input boxes for username and password and a submit button:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录页面</title>
</head>
<body>
<form method="post" action="/login">
    <h1>登录页面</h1>
    <label>用户名:</label><br/>
    <input type="text" name="username"><br/><br/>
    <label>密码:</label><br/>
    <input type="password" name="password"><br/><br/>
    <input type="submit" value="登录">
</form>
</body>
</html>

Copy after login

In Golang, we can use the Gin framework to process login requests. First, you need to import the gin library:

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

Copy after login

Next, you need to create the Gin engine and routing rules:

router := gin.Default()
router.POST("/login", handleLogin)

Copy after login

Next, you need to write the handleLogin function, which is used to process login requests:

func handleLogin(c *gin.Context) {
    username := c.PostForm("username")
    password := c.PostForm("password")

    if username == "admin" && password == "123456" {
        token := generateToken() // 生成令牌
        c.JSON(http.StatusOK, gin.H{
            "code": 1,
            "msg":  "登录成功",
            "data": token,
        })
    } else {
        c.JSON(http.StatusOK, gin.H{
            "code": 0,
            "msg":  "用户名或密码错误",
            "data": "",
        })
    }
}

Copy after login

In the handleLogin function, we first obtain the user name and password entered by the user, and then verify it by comparing it to the database. If the verification passes, we will generate a token and construct it into a JSON format data packet and return it; if the verification fails, we will directly return an error message.

The code to generate the token is as follows:

func generateToken() string {
    return randString(32)
}

Copy after login

In the generateToken function, we call a randString function to generate a random string with a length of 32, which is The token we generated.

func randString(len int) string {
    bytes := make([]byte, len)
    if _, err := rand.Read(bytes); err != nil {
        log.Fatalln(err)
    }
    return base64.StdEncoding.EncodeToString(bytes)
}

Copy after login

Finally, the HTML login page needs to be combined with the Gin engine so that users can access the login page through the browser. The code is as follows:

router.LoadHTMLGlob("templates/*")

router.GET("/", func(c *gin.Context) {
    c.HTML(http.StatusOK, "login.html", gin.H{})
})

router.Run(":8080")

Copy after login

In the program, we first call the router.LoadHTMLGlob function to specify the path of the HTML template. Then, we bind a default routing rule to redirect the user's request to the login page. Finally, we call the router.Run function so that the program can start an HTTP server locally and listen on port 8080.

After running the program, the user can visit http://localhost:8080 through the browser to access the login page. If the entered username and password are correct, a JSON-formatted packet containing the generated token will be received. If the entered username and password are incorrect, an error message will be returned.

Summary

This article introduces how to use Golang to implement login requests. Implementation steps include: creating a login interface, obtaining user login input, validating user input, constructing a login request, and sending a login request. We also provide a simple sample program through which you can better understand how to use Golang to develop login requests. Of course, specific implementation methods and techniques need to be adjusted and optimized according to different projects and needs.

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