ActivityPub.Publisher: Don't try federating if a user doesn't have an inbox.

lib/pleroma/web/activity_pub/publisher.ex

@@ -158,15 +158,10 @@ defp signature_host(%URI{port: port, scheme: scheme, host: host}) do
     end
   end
 
-  defp should_federate?(inbox, public) do
-    cond do
-      is_nil(inbox) ->
-        false
+  def should_federate?(nil, _), do: false
+  def should_federate?(_, true), do: true
 
-      public ->
-        true
-
-      true ->
+  def should_federate?(inbox, _) do
     %{host: host} = URI.parse(inbox)
 
     quarantined_instances =
@@ -176,7 +171,6 @@ defp should_federate?(inbox, public) do
 
     !Pleroma.Web.ActivityPub.MRF.subdomain_match?(quarantined_instances, host)
   end
-  end
 
   @spec recipients(User.t(), Activity.t()) :: [[User.t()]]
   defp recipients(actor, activity) do

test/pleroma/web/activity_pub/publisher_test.exs

@@ -25,6 +25,17 @@ defmodule Pleroma.Web.ActivityPub.PublisherTest do
 
   setup_all do: clear_config([:instance, :federating], true)
 
+  describe "should_federate?/1" do
+    test "it returns false when the inbox is nil" do
+      refute Publisher.should_federate?(nil, false)
+      refute Publisher.should_federate?(nil, true)
+    end
+
+    test "it returns true when public is true" do
+      assert Publisher.should_federate?(false, true)
+    end
+  end
+
   describe "gather_webfinger_links/1" do
     test "it returns links" do
       user = insert(:user)
@@ -205,6 +216,7 @@ test "publish to url with with different ports" do
       refute called(Instances.set_reachable(inbox))
     end
 
+    @tag capture_log: true
     test_with_mock "calls `Instances.set_unreachable` on target inbox on non-2xx HTTP response code",
                    Instances,
                    [:passthrough],