From 8c83c852304d0834dbfe76e91645ba7375e95437 Mon Sep 17 00:00:00 2001
From: tusooa <tusooa@kazv.moe>
Date: Fri, 7 Jul 2023 07:09:35 -0400
Subject: [PATCH] Make regex-to-string descriptor reusable

---
 .../web/activity_pub/mrf/emoji_policy.ex      | 12 ++----------
 .../web/activity_pub/mrf/keyword_policy.ex    | 16 ++++------------
 lib/pleroma/web/activity_pub/mrf/utils.ex     | 15 +++++++++++++++
 .../web/activity_pub/mrf/utils_test.exs       | 19 +++++++++++++++++++
 4 files changed, 40 insertions(+), 22 deletions(-)
 create mode 100644 lib/pleroma/web/activity_pub/mrf/utils.ex
 create mode 100644 test/pleroma/web/activity_pub/mrf/utils_test.exs

diff --git a/lib/pleroma/web/activity_pub/mrf/emoji_policy.ex b/lib/pleroma/web/activity_pub/mrf/emoji_policy.ex
index 95d6a6d43..f884962b9 100644
--- a/lib/pleroma/web/activity_pub/mrf/emoji_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/emoji_policy.ex
@@ -6,6 +6,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.EmojiPolicy do
   require Pleroma.Constants
 
   alias Pleroma.Object.Updater
+  alias Pleroma.Web.ActivityPub.MRF.Utils
 
   @moduledoc "Reject or force-unlisted emojis with certain URLs or names"
 
@@ -215,19 +216,10 @@ defmodule Pleroma.Web.ActivityPub.MRF.EmojiPolicy do
 
   @impl Pleroma.Web.ActivityPub.MRF.Policy
   def describe do
-    # This horror is needed to convert regex sigils to strings
     mrf_emoji =
       Pleroma.Config.get(:mrf_emoji, [])
       |> Enum.map(fn {key, value} ->
-        {key,
-         Enum.map(value, fn
-           pattern ->
-             if not is_binary(pattern) do
-               inspect(pattern)
-             else
-               pattern
-             end
-         end)}
+        {key, Enum.map(value, &Utils.describe_regex_or_string/1)}
       end)
       |> Enum.into(%{})
 
diff --git a/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex b/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
index 7c921fc76..26a611427 100644
--- a/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
+++ b/lib/pleroma/web/activity_pub/mrf/keyword_policy.ex
@@ -5,6 +5,8 @@
 defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
   require Pleroma.Constants
 
+  alias Pleroma.Web.ActivityPub.MRF.Utils
+
   @moduledoc "Reject or Word-Replace messages with a keyword or regex"
 
   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
@@ -128,7 +130,6 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
 
   @impl true
   def describe do
-    # This horror is needed to convert regex sigils to strings
     mrf_keyword =
       Pleroma.Config.get(:mrf_keyword, [])
       |> Enum.map(fn {key, value} ->
@@ -136,21 +137,12 @@ defmodule Pleroma.Web.ActivityPub.MRF.KeywordPolicy do
          Enum.map(value, fn
            {pattern, replacement} ->
              %{
-               "pattern" =>
-                 if not is_binary(pattern) do
-                   inspect(pattern)
-                 else
-                   pattern
-                 end,
+               "pattern" => Utils.describe_regex_or_string(pattern),
                "replacement" => replacement
              }
 
            pattern ->
-             if not is_binary(pattern) do
-               inspect(pattern)
-             else
-               pattern
-             end
+             Utils.describe_regex_or_string(pattern)
          end)}
       end)
       |> Enum.into(%{})
diff --git a/lib/pleroma/web/activity_pub/mrf/utils.ex b/lib/pleroma/web/activity_pub/mrf/utils.ex
new file mode 100644
index 000000000..f2dc9eea9
--- /dev/null
+++ b/lib/pleroma/web/activity_pub/mrf/utils.ex
@@ -0,0 +1,15 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.Utils do
+  @spec describe_regex_or_string(String.t() | Regex.t()) :: String.t()
+  def describe_regex_or_string(pattern) do
+    # This horror is needed to convert regex sigils to strings
+    if not is_binary(pattern) do
+      inspect(pattern)
+    else
+      pattern
+    end
+  end
+end
diff --git a/test/pleroma/web/activity_pub/mrf/utils_test.exs b/test/pleroma/web/activity_pub/mrf/utils_test.exs
new file mode 100644
index 000000000..3bbc2cfd3
--- /dev/null
+++ b/test/pleroma/web/activity_pub/mrf/utils_test.exs
@@ -0,0 +1,19 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.UtilsTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.Web.ActivityPub.MRF.Utils
+
+  describe "describe_regex_or_string/1" do
+    test "describes regex" do
+      assert "~r/foo/i" == Utils.describe_regex_or_string(~r/foo/i)
+    end
+
+    test "returns string as-is" do
+      assert "foo" == Utils.describe_regex_or_string("foo")
+    end
+  end
+end