From 17d938fc54b347d54a4f56c1f0d6e92c65033548 Mon Sep 17 00:00:00 2001
From: Matthew Holt <mholt@users.noreply.github.com>
Date: Sat, 8 Feb 2020 16:52:54 -0700
Subject: httpcaddyfile: Add support for DNS challenge solvers

Configuration via the Caddyfile requires use of env variables, but
an upstream issue is currently blocking that:
https://github.com/go-acme/lego/issues/1054

Providers will need to be retrofitted upstream in order to support env
var configuration.
---
 caddyconfig/httpcaddyfile/builtins.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'caddyconfig/httpcaddyfile/builtins.go')

diff --git a/caddyconfig/httpcaddyfile/builtins.go b/caddyconfig/httpcaddyfile/builtins.go
index 7c56b04..29ca0be 100644
--- a/caddyconfig/httpcaddyfile/builtins.go
+++ b/caddyconfig/httpcaddyfile/builtins.go
@@ -98,6 +98,7 @@ func parseRoot(h Helper) ([]ConfigValue, error) {
 //         alpn      <values...>
 //         load      <paths...>
 //         ca        <acme_ca_endpoint>
+//         dns       <provider_name>
 //     }
 //
 func parseTLS(h Helper) ([]ConfigValue, error) {
@@ -217,6 +218,21 @@ func parseTLS(h Helper) ([]ConfigValue, error) {
 				}
 				mgr.CA = arg[0]
 
+			// DNS provider for ACME DNS challenge
+			case "dns":
+				if !h.Next() {
+					return nil, h.ArgErr()
+				}
+				provName := h.Val()
+				if mgr.Challenges == nil {
+					mgr.Challenges = new(caddytls.ChallengesConfig)
+				}
+				dnsProvModule, err := caddy.GetModule("tls.dns." + provName)
+				if err != nil {
+					return nil, h.Errf("getting DNS provider module named '%s': %v", provName, err)
+				}
+				mgr.Challenges.DNSRaw = caddyconfig.JSONModuleObject(dnsProvModule.New(), "provider", provName, h.warnings)
+
 			default:
 				return nil, h.Errf("unknown subdirective: %s", h.Val())
 			}
-- 
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