Add deletion to masto api.

lib/pleroma/web/common_api/common_api.ex

@@ -0,0 +1,13 @@
+defmodule Pleroma.Web.CommonAPI do
+  alias Pleroma.{Repo, Activity, Object}
+  alias Pleroma.Web.ActivityPub.ActivityPub
+
+  def delete(activity_id, user) do
+    with %Activity{data: %{"object" => %{"id" => object_id}}} <- Repo.get(Activity, activity_id),
+         %Object{} = object <- Object.get_by_ap_id(object_id),
+           true <- user.ap_id == object.data["actor"],
+         {:ok, delete} <- ActivityPub.delete(object) do
+      {:ok, delete}
+    end
+  end
+end