Add config option to disable federation

Closes #148

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

config/config.exs

@@ -17,6 +17,8 @@ config :mobilizon, :instance,
   registrations_open: System.get_env("MOBILIZON_INSTANCE_REGISTRATIONS_OPEN") || false,
   repository: Mix.Project.config()[:source_url],
   allow_relay: true,
+  # Federation is to be activated with Mobilizon 1.0.0-beta.2
+  federating: false,
   remote_limit: 100_000,
   upload_limit: 16_000_000,
   avatar_upload_limit: 2_000_000,

lib/service/activity_pub/utils.ex

@@ -58,6 +58,7 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
   def maybe_federate(%Activity{local: true} = activity) do
     Logger.debug("Maybe federate an activity")
 
+    if Mobilizon.Config.get!([:instance, :federating]) do
       priority =
         case activity.data["type"] do
           "Delete" -> 10
@@ -66,6 +67,7 @@ defmodule Mobilizon.Service.ActivityPub.Utils do
         end
 
       Federator.enqueue(:publish, activity, priority)
+    end
 
     :ok
   end