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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| package mailvalidate | ||
|
|
||
| import ( | ||
| "regexp" | ||
| "strings" | ||
| "unicode" | ||
| ) | ||
|
|
||
| func IsSystemGeneratedUser(user string) bool { | ||
| if isNumeric(user) || isRandomUsername(user) { | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| func isNumeric(s string) bool { | ||
| for _, char := range s { | ||
| if !unicode.IsDigit(char) { | ||
| return false | ||
| } | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| func isRandomUsername(username string) bool { | ||
| // Check if the username contains only allowed characters | ||
| allowedChars := regexp.MustCompile(`^[a-zA-Z0-9.=_-]+$`) | ||
| if !allowedChars.MatchString(username) { | ||
| return false | ||
| } | ||
|
|
||
| // Check for patterns with many numbers and dashes | ||
| numDashPattern := regexp.MustCompile(`(\d+-){3,}|\d{5,}`) | ||
| if numDashPattern.MatchString(username) { | ||
| return true | ||
| } | ||
|
|
||
| // Check for long hexadecimal-like strings | ||
| hexPattern := regexp.MustCompile(`^[a-f0-9]{10,}$`) | ||
| if hexPattern.MatchString(username) { | ||
| return true | ||
| } | ||
|
|
||
| // Check for multiple segments separated by dots with numbers | ||
| segments := strings.Split(username, ".") | ||
| numericSegments := 0 | ||
| for _, segment := range segments { | ||
| if regexp.MustCompile(`^\d+$`).MatchString(segment) { | ||
| numericSegments++ | ||
| } | ||
| } | ||
| if numericSegments >= 3 { | ||
| return true | ||
| } | ||
|
|
||
| // Check for long random string followed by a more structured part | ||
| randomStructuredPattern := regexp.MustCompile(`^[a-z0-9]{20,}[-=][a-z0-9._-]+$`) | ||
| if randomStructuredPattern.MatchString(username) { | ||
| return true | ||
| } | ||
|
|
||
| // If none of the above patterns match, it's likely not a random username | ||
| return false | ||
| } | ||
|
|
||
| func countTransitions(s string) int { | ||
| transitions := 0 | ||
| prevType := otherType | ||
| for _, char := range s { | ||
| currentType := charTypeCheck(char) | ||
| if currentType != prevType && prevType != otherType && currentType != otherType { | ||
| transitions++ | ||
| } | ||
| prevType = currentType | ||
| } | ||
| return transitions | ||
| } | ||
|
|
||
| type charType int | ||
|
|
||
| const ( | ||
| otherType charType = iota | ||
| letterType | ||
| digitType | ||
| ) | ||
|
|
||
| func charTypeCheck(r rune) charType { | ||
| if unicode.IsLetter(r) { | ||
| return letterType | ||
| } else if unicode.IsDigit(r) { | ||
| return digitType | ||
| } | ||
| return otherType | ||
| } |
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