add tls config to server (#1202)

* add tls config

* add TLSConfig to acme provider

server/grpc/grpc.go

@@ -805,7 +805,14 @@ func (g *grpcServer) Start() error {
 		ts = l
 	} else {
 		var err error
-		ts, err = net.Listen("tcp", config.Address)
+
+		// check the tls config for secure connect
+		if tc := config.TLSConfig; tc != nil {
+			ts, err = tls.Listen("tcp", config.Address, tc)
+			// otherwise just plain tcp listener
+		} else {
+			ts, err = net.Listen("tcp", config.Address)
+		}
 		if err != nil {
 			return err
 		}

server/options.go

@@ -2,6 +2,7 @@ package server
 
 import (
 	"context"
+	"crypto/tls"
 	"sync"
 	"time"
 
@@ -39,6 +40,9 @@ type Options struct {
 	// The router for requests
 	Router Router
 
+	// TLSConfig specifies tls.Config for secure serving
+	TLSConfig *tls.Config
+
 	// Other options for implementations of the interface
 	// can be stored in a context
 	Context context.Context
@@ -205,6 +209,19 @@ func RegisterInterval(t time.Duration) Option {
 	}
 }
 
+// TLSConfig specifies a *tls.Config
+func TLSConfig(t *tls.Config) Option {
+	return func(o *Options) {
+		// set the internal tls
+		o.TLSConfig = t
+		// set the transport tls
+		o.Transport.Init(
+			transport.Secure(true),
+			transport.TLSConfig(t),
+		)
+	}
+}
+
 // WithRouter sets the request router
 func WithRouter(r Router) Option {
 	return func(o *Options) {