From 74d7754c4f5f6ed184a3e61192e82f66d702917f Mon Sep 17 00:00:00 2001
From: Matthew McPherrin <mattm@letsencrypt.org>
Date: Thu, 18 Jan 2024 05:11:39 -0500
Subject: [PATCH] cmd/sunlight: make ACME directory configurable (#3)

Also adds a user agent prefix.
---
 cmd/sunlight/main.go | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/cmd/sunlight/main.go b/cmd/sunlight/main.go
index e67d2b9..666dce3 100644
--- a/cmd/sunlight/main.go
+++ b/cmd/sunlight/main.go
@@ -32,6 +32,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"golang.org/x/crypto/acme"
 	"golang.org/x/crypto/acme/autocert"
 	"golang.org/x/sync/errgroup"
 	"gopkg.in/yaml.v3"
@@ -50,6 +51,10 @@ type Config struct {
 
 		// Cache is the path to the autocert cache directory.
 		Cache string
+
+		// Directory is an ACME directory URL to request a certificate from.
+		// Defaults to Let's Encrypt Production. Optional.
+		Directory string
 	}
 
 	DynamoDB struct {
@@ -283,6 +288,10 @@ func main() {
 		Prompt:     autocert.AcceptTOS,
 		Email:      c.ACME.Email,
 		HostPolicy: autocert.HostWhitelist(c.ACME.Host),
+		Client: &acme.Client{
+			DirectoryURL: c.ACME.Directory,
+			UserAgent:    "filippo.io/sunlight",
+		},
 	}
 	s := &http.Server{
 		Addr:         c.Listen,