config: allow relaying to be disabled

config/config.exs

@@ -59,6 +59,7 @@
   upload_limit: 16_000_000,
   registrations_open: true,
   federating: true,
+  allow_relay: true,
   rewrite_policy: Pleroma.Web.ActivityPub.MRF.NoOpPolicy,
   public: true,
   quarantined_instances: []

lib/pleroma/web/router.ex

@@ -5,6 +5,7 @@ defmodule Pleroma.Web.Router do
 
   @instance Application.get_env(:pleroma, :instance)
   @federating Keyword.get(@instance, :federating)
+  @allow_relay Keyword.get(@instance, :allow_relay)
   @public Keyword.get(@instance, :public)
   @registrations_open Keyword.get(@instance, :registrations_open)
 
@@ -318,11 +319,13 @@ def user_fetcher(username) do
   end
 
   if @federating do
+    if @allow_relay do
       scope "/", Pleroma.Web.ActivityPub do
         # XXX: not really ostatus either
         pipe_through(:ostatus)
         get("/", ActivityPubController, :relay)
       end
+    end
 
     scope "/", Pleroma.Web.ActivityPub do
       pipe_through(:activitypub)