Add new setting and Plug to allow for privilege settings for staff

test/pleroma/web/plugs/ensure_privileged_plug_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Plugs.EnsurePrivilegedPlugTest do
+  use Pleroma.Web.ConnCase, async: true
+
+  alias Pleroma.Web.Plugs.EnsurePrivilegedPlug
+  import Pleroma.Factory
+
+  test "denies a user that isn't moderator or admin" do
+    clear_config([:instance, :admin_privileges], [])
+    user = insert(:user)
+
+    conn =
+      build_conn()
+      |> assign(:user, user)
+      |> EnsurePrivilegedPlug.call(:cofe)
+
+    assert conn.status == 403
+  end
+
+  test "accepts an admin that is privileged" do
+    clear_config([:instance, :admin_privileges], [:cofe])
+    user = insert(:user, is_admin: true)
+    conn = assign(build_conn(), :user, user)
+
+    ret_conn = EnsurePrivilegedPlug.call(conn, :cofe)
+
+    assert conn == ret_conn
+  end
+
+  test "denies an admin that isn't privileged" do
+    clear_config([:instance, :admin_privileges], [:suya])
+    user = insert(:user, is_admin: true)
+
+    conn =
+      build_conn()
+      |> assign(:user, user)
+      |> EnsurePrivilegedPlug.call(:cofe)
+
+    assert conn.status == 403
+  end
+
+  test "accepts a moderator that is privileged" do
+    clear_config([:instance, :moderator_privileges], [:cofe])
+    user = insert(:user, is_moderator: true)
+    conn = assign(build_conn(), :user, user)
+
+    ret_conn = EnsurePrivilegedPlug.call(conn, :cofe)
+
+    assert conn == ret_conn
+  end
+
+  test "denies a moderator that isn't privileged" do
+    clear_config([:instance, :moderator_privileges], [:suya])
+    user = insert(:user, is_moderator: true)
+
+    conn =
+      build_conn()
+      |> assign(:user, user)
+      |> EnsurePrivilegedPlug.call(:cofe)
+
+    assert conn.status == 403
+  end
+
+  test "accepts for a priviledged role even if other role isn't priviledged" do
+    clear_config([:instance, :admin_privileges], [:cofe])
+    clear_config([:instance, :moderator_privileges], [])
+    user = insert(:user, is_admin: true, is_moderator: true)
+    conn = assign(build_conn(), :user, user)
+
+    ret_conn = EnsurePrivilegedPlug.call(conn, :cofe)
+
+    # priviledged through admin role
+    assert conn == ret_conn
+
+    clear_config([:instance, :admin_privileges], [])
+    clear_config([:instance, :moderator_privileges], [:cofe])
+    user = insert(:user, is_admin: true, is_moderator: true)
+    conn = assign(build_conn(), :user, user)
+
+    ret_conn = EnsurePrivilegedPlug.call(conn, :cofe)
+
+    # priviledged through moderator role
+    assert conn == ret_conn
+  end
+
+  test "denies when no user is set" do
+    conn =
+      build_conn()
+      |> EnsurePrivilegedPlug.call(:cofe)
+
+    assert conn.status == 403
+  end
+end