Add HTTPS configuration

Add the exporter-toolkit https package to allow configuring TLS and
auth.

Signed-off-by: Ben Kochie <superq@gmail.com>
Signed-off-by: Calle Pettersson <carlpett@users.noreply.github.com>

exporter.go

@@ -23,6 +23,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/prometheus/common/log"
 	"github.com/prometheus/common/version"
+	"github.com/prometheus/exporter-toolkit/https"
 	"gopkg.in/alecthomas/kingpin.v2"
 )
 
@@ -258,6 +259,10 @@ func main() {
 			"config.file",
 			"YAML configuration file to use. Values set in this file will be overriden by CLI flags.",
 		).String()
+		httpsConfig = kingpin.Flag(
+			"web.config",
+			"[EXPERIMENTAL] Path to config yaml file that can enable TLS or authentication.",
+		).Default("").String()
 		listenAddress = kingpin.Flag(
 			"telemetry.addr",
 			"host:port for exporter.",
@@ -398,7 +403,10 @@ func main() {
 
 	go func() {
 		log.Infoln("Starting server on", *listenAddress)
-		log.Fatalf("cannot start windows_exporter: %s", http.ListenAndServe(*listenAddress, nil))
+		server := &http.Server{Addr: *listenAddress}
+		if err := https.Listen(server, *httpsConfig, logger); err != nil {
+				log.Fatalf("cannot start windows_exporter: %s", err)
+		}
 	}()
 
 	for {