Main-password-validator.go

Main-password-validator.go

func passwordValidator(password string) error {
	var errs []error
	// validates if password is empty
	if password == "" {
		errs = append(errs, ErrPasswordRequired)
	}

	// validates if password contains small(lowercase) letters
	pattern1 := `[a-z]`
	ok, err := regexp.MatchString(pattern1, password)
	if err != nil {
		errs = append(errs, err)
	} else if !ok {
		errs = append(errs, ErrSmallLettersRequired)
	}

	// validates if password contains capital(uppercase) letters
	pattern2 := `[A-Z]`
	ok, err = regexp.MatchString(pattern2, password)
	if err != nil {
		errs = append(errs, err)
	} else if !ok {
		errs = append(errs, ErrCapitalRequired)
	}

	// validate if password contains special characters
	pattern3 := `"[~!@#$%^&*()-_+=[\]{}|\\;:\"<>,./?]"`
	ok, err = regexp.MatchString(pattern3, password)
	if err != nil {
		errs = append(errs, err)
	} else if !ok {
		errs = append(errs, ErrSpecialCharRequired)
	}

	// Basic password validation
	if password != "pas$0Word" && errs == nil {
		errs = append(errs, ErrPasswordDontMatch)
	}

	return errors.Join(errs...)
}