PasswordPolicy

Info

Utility class enforcing password strength requirements: 8-128 characters, must contain both letters and digits, no whitespace.

Overview

A stateless policy class that validates password strength at registration and password-change time.

Constants

Constant	Value	Description
MIN_LENGTH	8	Minimum password length
MAX_LENGTH	128	Maximum password length

Validation Rules

Rule	Error Message
Must not be null or blank	"密码不能为空"
Minimum 8 characters	"密码长度不能少于 8 位"
Maximum 128 characters	"密码长度不能超过 128 位"
No whitespace characters	"密码不能包含空白字符"
Must contain at least one letter	"密码必须同时包含字母和数字"
Must contain at least one digit	"密码必须同时包含字母和数字"

Methods

Method	Return	Description
validate(password)	String | null	Returns error message if invalid, null if valid