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|
package matching
import (
"strings"
"github.com/nbutton23/zxcvbn-go/entropy"
"github.com/nbutton23/zxcvbn-go/match"
)
const SEQUENCE_MATCHER_NAME = "SEQ"
func FilterSequenceMatcher(m match.Matcher) bool {
return m.ID == SEQUENCE_MATCHER_NAME
}
func sequenceMatch(password string) []match.Match {
var matches []match.Match
for i := 0; i < len(password); {
j := i + 1
var seq string
var seqName string
seqDirection := 0
for seqCandidateName, seqCandidate := range SEQUENCES {
iN := strings.Index(seqCandidate, string(password[i]))
var jN int
if j < len(password) {
jN = strings.Index(seqCandidate, string(password[j]))
} else {
jN = -1
}
if iN > -1 && jN > -1 {
direction := jN - iN
if direction == 1 || direction == -1 {
seq = seqCandidate
seqName = seqCandidateName
seqDirection = direction
break
}
}
}
if seq != "" {
for {
var prevN, curN int
if j < len(password) {
prevChar, curChar := password[j-1], password[j]
prevN, curN = strings.Index(seq, string(prevChar)), strings.Index(seq, string(curChar))
}
if j == len(password) || curN-prevN != seqDirection {
if j-i > 2 {
matchSequence := match.Match{
Pattern: "sequence",
I: i,
J: j - 1,
Token: password[i:j],
DictionaryName: seqName,
}
matchSequence.Entropy = entropy.SequenceEntropy(matchSequence, len(seq), (seqDirection == 1))
matches = append(matches, matchSequence)
}
break
} else {
j += 1
}
}
}
i = j
}
return matches
}
|
