Expose discovery cache over rest interface

cmd/syncthing/gui.go

@@ -49,6 +49,7 @@ func startGUI(cfg GUIConfiguration, m *Model) error {
 	router.Get("/rest/config/sync", restGetConfigInSync)
 	router.Get("/rest/system", restGetSystem)
 	router.Get("/rest/errors", restGetErrors)
+	router.Get("/rest/discovery", restGetDiscovery)
 
 	router.Post("/rest/config", restPostConfig)
 	router.Post("/rest/restart", restPostRestart)
@@ -243,6 +244,10 @@ func restPostDiscoveryHint(r *http.Request) {
 	}
 }
 
+func restGetDiscovery(w http.ResponseWriter) {
+	json.NewEncoder(w).Encode(discoverer.All())
+}
+
 func basic(username string, passhash string) http.HandlerFunc {
 	return func(res http.ResponseWriter, req *http.Request) {
 		error := func() {