Enforcement of OAuth scopes check for authenticated API endpoints, :skip_plug plug to mark a plug explicitly skipped (disabled).

lib/pleroma/plugs/auth_expected_plug.ex

@@ -0,0 +1,13 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Plugs.AuthExpectedPlug do
+  import Plug.Conn
+
+  def init(options), do: options
+
+  def call(conn, _) do
+    put_private(conn, :auth_expected, true)
+  end
+end

lib/pleroma/plugs/oauth_scopes_plug.ex

@@ -8,12 +8,15 @@ defmodule Pleroma.Plugs.OAuthScopesPlug do
 
   alias Pleroma.Config
   alias Pleroma.Plugs.EnsurePublicOrAuthenticatedPlug
+  alias Pleroma.Plugs.PlugHelper
 
   @behaviour Plug
 
   def init(%{scopes: _} = options), do: options
 
   def call(%Plug.Conn{assigns: assigns} = conn, %{scopes: scopes} = options) do
+    conn = PlugHelper.append_to_called_plugs(conn, __MODULE__)
+
     op = options[:op] || :|
     token = assigns[:token]
 

lib/pleroma/plugs/plug_helper.ex

@@ -0,0 +1,38 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Plugs.PlugHelper do
+  @moduledoc "Pleroma Plug helper"
+
+  def append_to_called_plugs(conn, plug_module) do
+    append_to_private_list(conn, :called_plugs, plug_module)
+  end
+
+  def append_to_skipped_plugs(conn, plug_module) do
+    append_to_private_list(conn, :skipped_plugs, plug_module)
+  end
+
+  def plug_called?(conn, plug_module) do
+    contained_in_private_list?(conn, :called_plugs, plug_module)
+  end
+
+  def plug_skipped?(conn, plug_module) do
+    contained_in_private_list?(conn, :skipped_plugs, plug_module)
+  end
+
+  def plug_called_or_skipped?(conn, plug_module) do
+    plug_called?(conn, plug_module) || plug_skipped?(conn, plug_module)
+  end
+
+  defp append_to_private_list(conn, private_variable, value) do
+    list = conn.private[private_variable] || []
+    modified_list = Enum.uniq(list ++ [value])
+    Plug.Conn.put_private(conn, private_variable, modified_list)
+  end
+
+  defp contained_in_private_list?(conn, private_variable, value) do
+    list = conn.private[private_variable] || []
+    value in list
+  end
+end