object: move object containment out of transmogrifier into it's own module

test/web/activity_pub/transmogrifier_test.exs

@@ -945,61 +945,4 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       :error = Transmogrifier.handle_incoming(data)
     end
   end
-
-  describe "general origin containment" do
-    test "contain_origin_from_id() catches obvious spoofing attempts" do
-      data = %{
-        "id" => "http://example.com/~alyssa/activities/1234.json"
-      }
-
-      :error =
-        Transmogrifier.contain_origin_from_id(
-          "http://example.org/~alyssa/activities/1234.json",
-          data
-        )
-    end
-
-    test "contain_origin_from_id() allows alternate IDs within the same origin domain" do
-      data = %{
-        "id" => "http://example.com/~alyssa/activities/1234.json"
-      }
-
-      :ok =
-        Transmogrifier.contain_origin_from_id(
-          "http://example.com/~alyssa/activities/1234",
-          data
-        )
-    end
-
-    test "contain_origin_from_id() allows matching IDs" do
-      data = %{
-        "id" => "http://example.com/~alyssa/activities/1234.json"
-      }
-
-      :ok =
-        Transmogrifier.contain_origin_from_id(
-          "http://example.com/~alyssa/activities/1234.json",
-          data
-        )
-    end
-
-    test "users cannot be collided through fake direction spoofing attempts" do
-      user =
-        insert(:user, %{
-          nickname: "rye@niu.moe",
-          local: false,
-          ap_id: "https://niu.moe/users/rye",
-          follower_address: User.ap_followers(%User{nickname: "rye@niu.moe"})
-        })
-
-      {:error, _} = User.get_or_fetch_by_ap_id("https://n1u.moe/users/rye")
-    end
-
-    test "all objects with fake directions are rejected by the object fetcher" do
-      {:error, _} =
-        ActivityPub.fetch_and_contain_remote_object_from_id(
-          "https://info.pleroma.site/activity4.json"
-        )
-    end
-  end
 end