func newValidatorImpl()

in validator.go [62:92]

• 29 lines of code
• 8 McCabe index (conditional complexity)

func newValidatorImpl(domains []string, usersFile string,
	done <-chan bool, onUpdate func()) func(string) bool {
	validUsers := NewUserMap(usersFile, done, onUpdate)

	var allowAll bool
	for i, domain := range domains {
		if domain == "*" {
			allowAll = true
			continue
		}
		domains[i] = fmt.Sprintf("@%s", strings.ToLower(domain))
	}

	validator := func(email string) (valid bool) {
		if email == "" {
			return
		}
		email = strings.ToLower(email)
		for _, domain := range domains {
			valid = valid || strings.HasSuffix(email, domain)
		}
		if !valid {
			valid = validUsers.IsValid(email)
		}
		if allowAll {
			valid = true
		}
		return valid
	}
	return validator
}