Feat/fileserver (#60)

* cleanup code for URL type

* fix makefile for trace mode

* refactor, merge Entry, RawEntry and Route into one. 

* Implement fileserver.

* refactor: rename HTTPRoute to ReverseProxyRoute to avoid confusion

* refactor: move metrics logger to middleware package

- fix prometheus metrics for load balanced routes
  - route will now fail when health monitor fail to start

* fix extra output of ls-* commands by defer initializaing stuff, speed up start time

* add test for path traversal attack, small fix on FileServer.Start method

* rename rule.on.bypass to pass

* refactor and fixed map-to-map  deserialization

* updated route loading logic

* schemas: add "add_prefix" option to modify_request middleware


* updated route JSONMarshalling

---------

Co-authored-by: yusing <yusing@6uo.me>

internal/api/v1/favicon/cache.go

@@ -29,6 +29,9 @@ const (
 )
 
 func InitIconCache() {
+	iconCacheMu.Lock()
+	defer iconCacheMu.Unlock()
+
 	err := utils.LoadJSONIfExist(common.IconCachePath, &iconCache)
 	if err != nil {
 		logging.Error().Err(err).Msg("failed to load icon cache")
@@ -78,7 +81,7 @@ func pruneExpiredIconCache() {
 }
 
 func routeKey(r route.HTTPRoute) string {
-	return r.RawEntry().Provider + ":" + r.TargetName()
+	return r.ProviderName() + ":" + r.TargetName()
 }
 
 func PruneRouteIconCache(route route.HTTPRoute) {