package cabf_br

/*
 * ZLint Copyright 2020 Regents of the University of Michigan
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

import (
	"strings"

	"github.com/zmap/zcrypto/x509"
	"github.com/zmap/zlint/v2/lint"
	"github.com/zmap/zlint/v2/util"
)

type DNSNameUnderscoreInTRD struct{}

func (l *DNSNameUnderscoreInTRD) Initialize() error {
	return nil
}

func (l *DNSNameUnderscoreInTRD) CheckApplies(c *x509.Certificate) bool {
	return util.IsSubscriberCert(c) && util.DNSNamesExist(c)
}

func (l *DNSNameUnderscoreInTRD) Execute(c *x509.Certificate) *lint.LintResult {
	if c.Subject.CommonName != "" && !util.CommonNameIsIP(c) {
		domainInfo := c.GetParsedSubjectCommonName(false)
		if domainInfo.ParseError != nil {
			return &lint.LintResult{Status: lint.NA}
		}
		if strings.Contains(domainInfo.ParsedDomain.TRD, "_") {
			return &lint.LintResult{Status: lint.Warn}
		}
	}

	parsedSANDNSNames := c.GetParsedDNSNames(false)
	for i := range c.GetParsedDNSNames(false) {
		if parsedSANDNSNames[i].ParseError != nil {
			return &lint.LintResult{Status: lint.NA}
		}
		if strings.Contains(parsedSANDNSNames[i].ParsedDomain.TRD, "_") {
			return &lint.LintResult{Status: lint.Warn}
		}
	}

	return &lint.LintResult{Status: lint.Pass}
}

func init() {
	lint.RegisterLint(&lint.Lint{
		Name:          "w_dnsname_underscore_in_trd",
		Description:   "DNSName should not have an underscore in labels left of the ETLD+1",
		Citation:      "BRs: 7.1.4.2",
		Source:        lint.CABFBaselineRequirements,
		EffectiveDate: util.RFC5280Date,
		Lint:          &DNSNameUnderscoreInTRD{},
	})
}
