/
pass.go
144 lines (120 loc) · 4.67 KB
/
pass.go
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package common
import (
"math/rand"
"time"
"github.com/pingcap/errors"
"github.com/romberli/go-util/constant"
)
const (
DefaultLetters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+-,.?_"
DefaultNormalCharString = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
DefaultUpperCaseCharString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
DefaultLowerCaseCharString = "abcdefghijklmnopqrstuvwxyz"
DefaultDigitalCharString = "0123456789"
DefaultSpecialCharString = "+-,.?_"
DefaultNormalCharNum = 6
DefaultUpperCaseCharNum = 2
DefaultLowerCaseCharNum = 4
DefaultDigitalNum = 3
DefaultSpecialNum = 2
DefaultMinPasswordLength = 8
DefaultMaxPasswordLength = 20
DefaultMinUpperCaseCharNum = 1
DefaultMinLowerCaseCharNum = 1
DefaultMinDigitalCharNum = 1
DefaultMinSpecialCharNum = 1
)
// GetRandomStringWithDefault returns a random string with default length
func GetRandomStringWithDefault() string {
first := GetRandomString(DefaultNormalCharString, constant.OneInt)
upperCaseCharBytes := GetRandomBytes(DefaultUpperCaseCharString, DefaultUpperCaseCharNum)
lowerCaseCharBytes := GetRandomBytes(DefaultLowerCaseCharString, DefaultLowerCaseCharNum)
digitalCharBytes := GetRandomBytes(DefaultDigitalCharString, DefaultDigitalNum)
specialCharBytes := GetRandomBytes(DefaultSpecialCharString, DefaultSpecialNum)
s := append(upperCaseCharBytes, lowerCaseCharBytes...)
s = append(s, digitalCharBytes...)
s = append(s, specialCharBytes...)
rand.Shuffle(len(s), func(i, j int) { s[i], s[j] = s[j], s[i] })
return first + string(s)
}
// GetRandomNormalCharString returns a random string with given length
func GetRandomNormalCharString(num int) string {
return GetRandomString(DefaultNormalCharString, num)
}
// GetRandomDigitalString returns a random string with given length
func GetRandomDigitalString(num int) string {
return GetRandomString(DefaultDigitalCharString, num)
}
// GetRandomSpecialString returns a random string with given length
func GetRandomSpecialString(num int) string {
return GetRandomString(DefaultSpecialCharString, num)
}
// GetRandomString returns a random string from given string with given length
func GetRandomString(s string, num int) string {
return string(GetRandomBytes(s, num))
}
func GetRandomBytes(s string, num int) []byte {
source := rand.NewSource(time.Now().UnixNano())
b := make([]byte, num)
for i := range b {
b[i] = s[source.Int63()%int64(len(s))]
}
return b
}
// CheckPasswordStrength checks the strength of password
func CheckPasswordStrength(password string, minLen, maxLen, minUpperCaseCharNum, minLowerCaseCharNum, minDigitCharNum,
minSpecialCharNum int, supportedSpecialCharString string) error {
length := len(password)
if length < minLen || length > maxLen {
return errors.Errorf("password length must be between %d and %d, %d is not valid", minLen, maxLen, length)
}
var (
upperCaseCharNum int
lowerCaseCharNum int
digitCharNum int
specialCharNum int
unsupportedCharNum int
)
for _, c := range password {
var hasSpecialChar bool
switch {
case c >= 'A' && c <= 'Z':
upperCaseCharNum++
case c >= 'a' && c <= 'z':
lowerCaseCharNum++
case c >= '0' && c <= '9':
digitCharNum++
default:
for _, sc := range supportedSpecialCharString {
if c == sc {
specialCharNum++
hasSpecialChar = true
}
}
if !hasSpecialChar {
unsupportedCharNum++
}
}
}
if upperCaseCharNum < minUpperCaseCharNum {
return errors.Errorf("password must contain at least %d upper case characters, %d is not valid", minUpperCaseCharNum, upperCaseCharNum)
}
if lowerCaseCharNum < minLowerCaseCharNum {
return errors.Errorf("password must contain at least %d lower case characters, %d is not valid", minLowerCaseCharNum, lowerCaseCharNum)
}
if digitCharNum < minDigitCharNum {
return errors.Errorf("password must contain at least %d digit characters, %d is not valid", minDigitCharNum, digitCharNum)
}
if specialCharNum < minSpecialCharNum {
return errors.Errorf("password must contain at least %d special characters, %d is not valid", minSpecialCharNum, specialCharNum)
}
if unsupportedCharNum > constant.ZeroInt {
return errors.Errorf("special character must be one of [%s], the password contains unsupported characters", supportedSpecialCharString)
}
return nil
}
// CheckPasswordStrengthWithDefault checks the strength of password with default parameters
func CheckPasswordStrengthWithDefault(password string) error {
return CheckPasswordStrength(password, DefaultMinPasswordLength, DefaultMaxPasswordLength, DefaultMinUpperCaseCharNum,
DefaultMinLowerCaseCharNum, DefaultMinDigitalCharNum, DefaultMinSpecialCharNum, DefaultSpecialCharString)
}