What is single sign-on? How to implement it using golang?

Single Sign-On (SSO) is a user authentication method. Once the user logs in, he or she can gain access in different systems or applications without re-entering the user name and password. In enterprise-level applications, single sign-on is of great significance in improving user experience, simplifying management operations, and enhancing security.

The Golang language has received widespread attention because of its efficiency, simplicity, and easy maintenance. This article will introduce how to use Golang to implement single sign-on.

1. Single sign-on principle

Single sign-on mainly includes three roles: user agent, authentication center and resource service. When a user logs in to an application system, he will be redirected to the authentication center for identity authentication. After passing the authentication, he can still obtain access rights in other resource services.

2. Golang single sign-on principle

In Golang, you can use Cookie or Token to implement the single sign-on function.

2.1 Cookie method

In the Cookie method, the login information will be saved in the Cookie. When accessing other services after logging in, the information in the Cookie will be transferred to the resource service, so that the resource service can Verify user identity.

First of all, the authentication center performs login authentication, which saves the authentication information in Cookie. The code is as follows:

func Login(c *gin.Context) {
    c.SetCookie("username", "123", 3600, "/", "localhost", false, true)
    c.JSON(200, "登录成功")
}

In the above code, the first parameter in the SetCookie method is Cookie. The name, the second parameter is the value of the cookie, the third parameter is the expiration time of the cookie, the fourth parameter is the effective path of the cookie, the fifth parameter is the domain name of the cookie, and the sixth parameter indicates whether only HTTPS is supported. Protocol, the last parameter indicates whether cross-domain access is allowed.

In the resource service, you can obtain Cookie information through the c.Request.Cookie("username") method:

func SSO(c *gin.Context) {
    cookie, _ := c.Request.Cookie("username")
    if cookie != nil {
        c.JSON(200, "访问成功")
    } else {
        c.JSON(200, "请重新登录")
    }
}

2.2 Token method

In the token method, the authentication center encrypts the authentication information into the form of token. When it is transmitted to the resource service, the resource service verifies the validity of the user account through decryption.

The following is the implementation code of the Token method:

func Login(c *gin.Context) {
    username := "123"
    token, err := CreateToken(username)
    if err != nil {
        c.JSON(500, "生成Token错误")
        return
    }

    c.JSON(200, gin.H{
        "Token": token,
    })
}

func CreateToken(username string) (string, error) {
    claims := Claims{
        username,
        jwt.StandardClaims{
            ExpiresAt: time.Now().Add(time.Hour * 24).Unix(),
            Issuer:    "test",
        },
    }
    token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
    signedToken, err := token.SignedString([]byte("SecretKey"))
    if err != nil {
        return "", err
    }
    return signedToken, nil
}

func SSO(c *gin.Context) {
    tokenString := c.Request.Header.Get("Authorization")
    if tokenString == "" {
        c.JSON(401, "未登录")
        return
    }
    token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
        return []byte("SecretKey"), nil
    })
    if err != nil || !token.Valid {
        c.JSON(401, "未登录")
        return
    }
    c.JSON(200, "访问成功")
}

type Claims struct {
    Username string `json:"username"`
    jwt.StandardClaims
}

In the above code, the Token generated by the CreateToken method contains the user name, expiration time, issuer and other information, and the Token is generated in the certification center Afterwards, the Token is passed to the resource service, and the validity of the Token is verified through decryption in the resource service to achieve single sign-on.

3. Summary

Golang single sign-on function can be implemented through Cookie or Token. In enterprise-level applications, single sign-on can simplify user operation processes, improve application security, and bring better operational benefits to enterprises.

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