package checker

import "crypto/tls"

func tlsVersionString(v uint16) string {
	switch v {
	case tls.VersionTLS10:
		return "TLS 1.0"
	case tls.VersionTLS11:
		return "TLS 1.1"
	case tls.VersionTLS12:
		return "TLS 1.2"
	case tls.VersionTLS13:
		return "TLS 1.3"
	}
	return "TLS ?"
}

func peerCertCN(s *tls.ConnectionState) string {
	if s == nil || len(s.PeerCertificates) == 0 {
		return ""
	}
	return s.PeerCertificates[0].Subject.CommonName
}