package community

/*
 * ZLint Copyright 2023 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 (
	"github.com/zmap/zcrypto/encoding/asn1"
	"github.com/zmap/zcrypto/x509"
	"github.com/zmap/zcrypto/x509/pkix"
	"github.com/zmap/zlint/v3/lint"
	"github.com/zmap/zlint/v3/util"
)

type SubjectRDNHasMultipleAttribute struct{}

func init() {
	lint.RegisterLint(&lint.Lint{
		Name:          "n_multiple_subject_rdn",
		Description:   "Certificates typically do not have multiple attributes in a single RDN (subject). This may be an error.",
		Citation:      "lint.AWSLabs certlint",
		Source:        lint.Community,
		EffectiveDate: util.ZeroDate,
		Lint:          NewSubjectRDNHasMultipleAttribute,
	})
}

func NewSubjectRDNHasMultipleAttribute() lint.LintInterface {
	return &SubjectRDNHasMultipleAttribute{}
}

func (l *SubjectRDNHasMultipleAttribute) CheckApplies(c *x509.Certificate) bool {
	return true
}

func (l *SubjectRDNHasMultipleAttribute) Execute(c *x509.Certificate) *lint.LintResult {
	var subject pkix.RDNSequence
	if _, err := asn1.Unmarshal(c.RawSubject, &subject); err != nil {
		return &lint.LintResult{Status: lint.Fatal}
	}
	for _, rdn := range subject {
		if len(rdn) > 1 {
			return &lint.LintResult{Status: lint.Notice}
		}
	}
	return &lint.LintResult{Status: lint.Pass}
}
