How to verify password complexity in golang

In recent years, due to the frequent occurrence of various security incidents, the security and complexity of passwords have received more and more attention. In development, how to verify the complexity of passwords has also become a big problem. This article will introduce how to verify the complexity of passwords in golang.

First of all, we need to understand the complexity of the password. The complexity of a password, usually refers to its strength. The strength of a password usually includes the following aspects: password length, password character set, password combination method, etc.

In golang, we can use regular expressions to verify password complexity. However, if you use traditional regular expressions for password strength verification, you need to write quite complex regular expressions. This operation can be said to be relatively cumbersome and complicated. However, fortunately, an open source library in golang has helped us complete this work.

The library is called password-validator, and its main function is to check common password formats and complexity. You can check the combination of password length, numbers, letters, special characters and other parameters, and return a password that meets the requirements. This method is relatively simple and easy to use.

The following is a simple example:

package main

import (
    "github.com/davidmanzanares/password-validator"
)

func main() {
    // 定义密码规则
    rule := validator.Must(validator.NewRuleset().
        Length(8, 100).
        HasLowercase(1).
        HasUppercase(1).
        HasDigit(1).
        HasSpecial(1).
        Build())

    pass := "123456Qq!"
    valid, err := rule.Validate(pass)
    if err != nil {
        panic(err)
    }
    if !valid {
        panic("password not valid")
    }
}

In the above example, we first define a rule. The specific rule is that the password length is between 8 and 100, and must contain lowercase letters and uppercase letters. , numbers and special characters. Next, we use this rule for password verification.

It should be noted that the built-in ruleset used by the library by default already contains checks for most common password formats and complexity. If you want to customize password rules according to your business needs, you can use NewRuleset to customize the rules.

To sum up, to implement password complexity verification in golang, you can use the third-party library password-validator. This library can be said to be very convenient and easy to use. Of course, if you need more customized password verification, you can define your own rule set and define the rules that need to be checked in the rule set. In this way, we can ensure the security of users' passwords and effectively avoid security incidents.

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