Don't federate anything when instance is private

Ref T576

posts.go

@@ -586,7 +586,7 @@ func newPost(app *App, w http.ResponseWriter, r *http.Request) error {
 	// Write success now
 	response := impart.WriteSuccess(w, newPost, http.StatusCreated)
 
-	if newPost.Collection != nil && app.cfg.App.Federation && !newPost.Created.After(time.Now()) {
+	if newPost.Collection != nil && !app.cfg.App.Private && app.cfg.App.Federation && !newPost.Created.After(time.Now()) {
 		go federatePost(app, newPost, newPost.Collection.ID, false)
 	}
 
@@ -686,7 +686,7 @@ func existingPost(app *App, w http.ResponseWriter, r *http.Request) error {
 
 	if pRes.CollectionID.Valid {
 		coll, err := app.db.GetCollectionBy("id = ?", pRes.CollectionID.Int64)
-		if err == nil && app.cfg.App.Federation {
+		if err == nil && !app.cfg.App.Private && app.cfg.App.Federation {
 			pRes.Collection = &CollectionObj{Collection: *coll}
 			go federatePost(app, pRes, pRes.Collection.ID, true)
 		}
@@ -826,7 +826,7 @@ func deletePost(app *App, w http.ResponseWriter, r *http.Request) error {
 	if t != nil {
 		t.Commit()
 	}
-	if coll != nil && app.cfg.App.Federation {
+	if coll != nil && !app.cfg.App.Private && app.cfg.App.Federation {
 		go deleteFederatedPost(app, pp, collID.Int64)
 	}
 
@@ -870,7 +870,7 @@ func addPost(app *App, w http.ResponseWriter, r *http.Request) error {
 		return err
 	}
 
-	if app.cfg.App.Federation {
+	if !app.cfg.App.Private && app.cfg.App.Federation {
 		for _, pRes := range *res {
 			if pRes.Code != http.StatusOK {
 				continue