Make loglevel configurable

defaults to debug to keep former behaviour

main.go

@@ -16,6 +16,7 @@ import (
 
 var (
 	httpPort = flag.Int("http_port", LookupEnvOrInt("HTTP_PORT", 80), "HTTP port to serve on (defaults to 80)")
+	logLevel = flag.String("loglevel", LookupEnvOrString("LOGLEVEL", "debug"), "log level (debug, info, warning, error) (defaults to debug)")
 )
 
 type TokenResponse struct {
@@ -60,9 +61,21 @@ func main() {
 		FullTimestamp:    true,
 		TimestampFormat:  "2006-01-02 15:04:05",
 	})
-	// TODO(SBL): Level should be configurable via flag
-	//log.SetLevel(log.WarnLevel)
-	log.SetLevel(log.DebugLevel)
+
+	// Configure log level
+	switch strings.ToLower(*logLevel) {
+	case "error":
+		log.SetLevel(log.ErrorLevel)
+	case "warning":
+		log.SetLevel(log.WarnLevel)
+	case "info":
+		log.SetLevel(log.InfoLevel)
+	case "debug":
+		log.SetLevel(log.DebugLevel)
+	default:
+		log.SetLevel(log.DebugLevel)
+		log.Fatalf("Unknown logging level %s. Choose between debug, info, warning or error.", *logLevel)
+	}
 
 	mux := http.NewServeMux()
 	log.Infof("Starting Server on port %d\n", *httpPort)