package acme

// Challenge is a string that identifies a particular type and version of ACME challenge.
type Challenge string

const (
	// HTTP01 is the "http-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#http
	// Note: HTTP01ChallengePath returns the URL path to fulfill this challenge
	HTTP01 = Challenge("http-01")
	// TLSSNI01 is the "tls-sni-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#tls-with-server-name-indication-tls-sni
	// Note: TLSSNI01ChallengeCert returns a certificate to fulfill this challenge
	TLSSNI01 = Challenge("tls-sni-01")
	// TLSSNI02 is the "tls-sni-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#tls-with-server-name-indication-tls-sni
	// Note: TLSSNI02ChallengeCert returns a certificate to fulfill this challenge
	TLSSNI02 = Challenge("tls-sni-02")
	// DNS01 is the "dns-01" ACME challenge https://github.com/ietf-wg-acme/acme/blob/master/draft-ietf-acme-acme.md#dns
	// Note: DNS01Record returns a DNS record which will fulfill this challenge
	DNS01 = Challenge("dns-01")
)