68 lines
1.6 KiB
Go
68 lines
1.6 KiB
Go
package matching
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import (
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"strings"
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"github.com/nbutton23/zxcvbn-go/entropy"
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"github.com/nbutton23/zxcvbn-go/match"
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)
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const repeatMatcherName = "REPEAT"
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//FilterRepeatMatcher can be pass to zxcvbn-go.PasswordStrength to skip that matcher
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func FilterRepeatMatcher(m match.Matcher) bool {
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return m.ID == repeatMatcherName
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}
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func repeatMatch(password string) []match.Match {
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var matches []match.Match
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//Loop through password. if current == prev currentStreak++ else if currentStreak > 2 {buildMatch; currentStreak = 1} prev = current
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var current, prev string
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currentStreak := 1
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var i int
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var char rune
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for i, char = range password {
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current = string(char)
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if i == 0 {
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prev = current
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continue
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}
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if strings.ToLower(current) == strings.ToLower(prev) {
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currentStreak++
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} else if currentStreak > 2 {
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iPos := i - currentStreak
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jPos := i - 1
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matchRepeat := match.Match{
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Pattern: "repeat",
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I: iPos,
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J: jPos,
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Token: password[iPos : jPos+1],
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DictionaryName: prev}
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matchRepeat.Entropy = entropy.RepeatEntropy(matchRepeat)
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matches = append(matches, matchRepeat)
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currentStreak = 1
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} else {
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currentStreak = 1
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}
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prev = current
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}
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if currentStreak > 2 {
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iPos := i - currentStreak + 1
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jPos := i
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matchRepeat := match.Match{
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Pattern: "repeat",
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I: iPos,
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J: jPos,
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Token: password[iPos : jPos+1],
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DictionaryName: prev}
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matchRepeat.Entropy = entropy.RepeatEntropy(matchRepeat)
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matches = append(matches, matchRepeat)
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}
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return matches
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}
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