Verify link ownership with rel="me"

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

test/pleroma/user_test.exs

@@ -2913,4 +2913,29 @@ defmodule Pleroma.UserTest do
       refute User.endorses?(user, pinned_user)
     end
   end
+
+  test "it checks fields links for a backlink" do
+    user = insert(:user, ap_id: "https://social.example.org/users/lain")
+
+    fields = [
+      %{"name" => "Link", "value" => "http://example.com/rel_me/null"},
+      %{"name" => "Verified link", "value" => "http://example.com/rel_me/link"},
+      %{"name" => "Not a link", "value" => "i'm not a link"}
+    ]
+
+    user
+    |> User.update_and_set_cache(%{raw_fields: fields})
+
+    ObanHelpers.perform_all()
+
+    user = User.get_cached_by_id(user.id)
+
+    assert [
+             %{"verified_at" => nil},
+             %{"verified_at" => verified_at},
+             %{"verified_at" => nil}
+           ] = user.fields
+
+    assert is_binary(verified_at)
+  end
 end