Metadata: Move restriction check from Feed provider to activated_providers

lib/pleroma/web/metadata.ex

@@ -7,7 +7,6 @@ defmodule Pleroma.Web.Metadata do
 
   def build_tags(params) do
     providers = [
-      Pleroma.Web.Metadata.Providers.Feed,
       Pleroma.Web.Metadata.Providers.RelMe,
       Pleroma.Web.Metadata.Providers.RestrictIndexing
       | activated_providers()
@@ -47,7 +46,7 @@ def activity_nsfw?(_) do
 
   defp activated_providers do
     unless Pleroma.Config.restrict_unauthenticated_access?(:activities, :local) do
-      Pleroma.Config.get([__MODULE__, :providers], [])
+      [Pleroma.Web.Metadata.Providers.Feed | Pleroma.Config.get([__MODULE__, :providers], [])]
     else
       []
     end

lib/pleroma/web/metadata/feed.ex

@@ -11,7 +11,6 @@ defmodule Pleroma.Web.Metadata.Providers.Feed do
 
   @impl Provider
   def build_tags(%{user: user}) do
-    if Pleroma.Config.get!([:instance, :public]) do
     [
       {:link,
        [
@@ -20,8 +19,5 @@ def build_tags(%{user: user}) do
          href: Helpers.user_feed_path(Endpoint, :feed, user.nickname) <> ".atom"
        ], []}
     ]
-    else
-      []
-    end
   end
 end

test/web/metadata/metadata_test.exs

@@ -24,10 +24,8 @@ test "for local user" do
   end
 
   describe "no metadata for private instances" do
-    setup do: clear_config([:instance, :public])
-
     test "for local user" do
-      Pleroma.Config.put([:instance, :public], false)
+      clear_config([:instance, :public], false)
       user = insert(:user, bio: "This is my secret fedi account bio")
 
       assert "" = Pleroma.Web.Metadata.build_tags(%{user: user})