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")

	// 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")

	// TLSALPN01 is the "tls-alpn-01" ACME challenge https://tools.ietf.org/html/draft-ietf-acme-tls-alpn-01
	TLSALPN01 = Challenge("tls-alpn-01")
)