Metadata: Do not include .atom feed links for remote accounts

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

changelog.d/atom-tag.change

@@ -0,0 +1 @@
+Metadata: Do not include .atom feed links for remote accounts

lib/pleroma/web/metadata/providers/feed.ex

@@ -10,7 +10,7 @@ defmodule Pleroma.Web.Metadata.Providers.Feed do
   @behaviour Provider
 
   @impl Provider
-  def build_tags(%{user: user}) do
+  def build_tags(%{user: %{local: true} = user}) do
     [
       {:link,
        [
@@ -20,4 +20,6 @@ def build_tags(%{user: user}) do
        ], []}
     ]
   end
+
+  def build_tags(_), do: []
 end

test/pleroma/web/metadata/providers/feed_test.exs

@@ -15,4 +15,10 @@ test "it renders a link to user's atom feed" do
               [rel: "alternate", type: "application/atom+xml", href: "/users/lain/feed.atom"], []}
            ]
   end
+
+  test "it doesn't render a link to remote user's feed" do
+    user = insert(:user, nickname: "lain@lain.com", local: false)
+
+    assert Feed.build_tags(%{user: user}) == []
+  end
 end