Add `tls ca` directive

main.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"context"
 	"fmt"
 	"log"
 	"net"
@@ -17,9 +16,18 @@ func main() {
 
 	srv := NewServer()
 
-	for _, d := range cfg.ChildrenByName("frontend") {
-		if err := parseFrontend(srv, d); err != nil {
-			log.Fatalf("failed to parse frontend: %v", err)
+	for _, d := range cfg.Children {
+		var err error
+		switch d.Name {
+		case "frontend":
+			err = parseFrontend(srv, d)
+		case "tls":
+			err = parseTLS(srv, d)
+		default:
+			log.Fatalf("unknown %q directive", d.Name)
+		}
+		if err != nil {
+			log.Fatalf("directive %q: %v", d.Name, err)
 		}
 	}
 
@@ -43,7 +51,6 @@ func parseFrontend(srv *Server, d *Directive) error {
 		return err
 	}
 
-	var certNames []string
 	for _, listenAddr := range d.Params {
 		host, port, err := net.SplitHostPort(listenAddr)
 		if err != nil {
@@ -54,8 +61,9 @@ func parseFrontend(srv *Server, d *Directive) error {
 		var name string
 		if host != "" && host != "localhost" && net.ParseIP(host) == nil {
 			name = host
-			certNames = append(certNames, host)
 			host = ""
+
+			srv.ManagedNames = append(srv.ManagedNames, name)
 		}
 
 		addr := net.JoinHostPort(host, port)
@@ -66,10 +74,6 @@ func parseFrontend(srv *Server, d *Directive) error {
 		}
 	}
 
-	if err := srv.certmagic.ManageAsync(context.Background(), certNames); err != nil {
-		return fmt.Errorf("failed to manage TLS certificates: %v", err)
-	}
-
 	return nil
 }
 
@@ -103,3 +107,19 @@ func parseBackend(backend *Backend, d *Directive) error {
 
 	return nil
 }
+
+func parseTLS(srv *Server, d *Directive) error {
+	for _, child := range d.Children {
+		switch child.Name {
+		case "ca":
+			var caURL string
+			if err := child.ParseParams(&caURL); err != nil {
+				return err
+			}
+			srv.acmeManager.CA = caURL
+		default:
+			return fmt.Errorf("unknown %q directive", child.Name)
+		}
+	}
+	return nil
+}

server.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"crypto/tls"
 	"fmt"
 	"io"
@@ -13,24 +14,25 @@ import (
 type Server struct {
 	Listeners    map[string]*Listener // indexed by listening address
 	Frontends    []*Frontend
+	ManagedNames []string
+
+	acmeManager *certmagic.ACMEManager
 	certmagic   *certmagic.Config
 }
 
 func NewServer() *Server {
 	cfg := certmagic.NewDefault()
 
-	acme := certmagic.DefaultACME
-	// TODO: use production CA
-	acme.CA = certmagic.LetsEncryptStagingCA
-	acme.Agreed = true
+	mgr := certmagic.NewACMEManager(cfg, certmagic.DefaultACME)
+	mgr.Agreed = true
 	// TODO: enable HTTP challenge by peeking incoming requests on port 80
-	acme.DisableHTTPChallenge = true
-	mgr := certmagic.NewACMEManager(cfg, acme)
+	mgr.DisableHTTPChallenge = true
 	cfg.Issuer = mgr
 	cfg.Revoker = mgr
 
 	return &Server{
 		Listeners:   make(map[string]*Listener),
+		acmeManager: mgr,
 		certmagic:   cfg,
 	}
 }
@@ -46,6 +48,10 @@ func (srv *Server) RegisterListener(addr string) *Listener {
 }
 
 func (srv *Server) Start() error {
+	if err := srv.certmagic.ManageAsync(context.Background(), srv.ManagedNames); err != nil {
+		return fmt.Errorf("failed to manage TLS certificates: %v", err)
+	}
+
 	for _, ln := range srv.Listeners {
 		if err := ln.Start(); err != nil {
 			return err