From 3ff9c5e2a67ab83c2abdb14cd246dea059079e75 Mon Sep 17 00:00:00 2001
From: Alex Gleason <alex@alexgleason.me>
Date: Sat, 22 May 2021 16:44:51 -0500
Subject: [PATCH] Break out activity-specific HTML functions into
 Pleroma.Activity.HTML Fixes cycles in
 lib/pleroma/ecto_type/activity_pub/object_validators/safe_text.ex

---
 lib/pleroma/activity/html.ex                  | 45 +++++++++++++++++++
 lib/pleroma/html.ex                           | 35 ---------------
 .../web/mastodon_api/views/status_view.ex     |  4 +-
 lib/pleroma/web/metadata/utils.ex             |  3 +-
 4 files changed, 49 insertions(+), 38 deletions(-)
 create mode 100644 lib/pleroma/activity/html.ex

diff --git a/lib/pleroma/activity/html.ex b/lib/pleroma/activity/html.ex
new file mode 100644
index 000000000..0bf393836
--- /dev/null
+++ b/lib/pleroma/activity/html.ex
@@ -0,0 +1,45 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Activity.HTML do
+  alias Pleroma.HTML
+  alias Pleroma.Object
+
+  @cachex Pleroma.Config.get([:cachex, :provider], Cachex)
+
+  def get_cached_scrubbed_html_for_activity(
+        content,
+        scrubbers,
+        activity,
+        key \\ "",
+        callback \\ fn x -> x end
+      ) do
+    key = "#{key}#{generate_scrubber_signature(scrubbers)}|#{activity.id}"
+
+    @cachex.fetch!(:scrubber_cache, key, fn _key ->
+      object = Object.normalize(activity, fetch: false)
+      HTML.ensure_scrubbed_html(content, scrubbers, object.data["fake"] || false, callback)
+    end)
+  end
+
+  def get_cached_stripped_html_for_activity(content, activity, key) do
+    get_cached_scrubbed_html_for_activity(
+      content,
+      FastSanitize.Sanitizer.StripTags,
+      activity,
+      key,
+      &HtmlEntities.decode/1
+    )
+  end
+
+  defp generate_scrubber_signature(scrubber) when is_atom(scrubber) do
+    generate_scrubber_signature([scrubber])
+  end
+
+  defp generate_scrubber_signature(scrubbers) do
+    Enum.reduce(scrubbers, "", fn scrubber, signature ->
+      "#{signature}#{to_string(scrubber)}"
+    end)
+  end
+end
diff --git a/lib/pleroma/html.ex b/lib/pleroma/html.ex
index 2dfdca693..bee66169d 100644
--- a/lib/pleroma/html.ex
+++ b/lib/pleroma/html.ex
@@ -49,31 +49,6 @@ def filter_tags(html, scrubber) do
   def filter_tags(html), do: filter_tags(html, nil)
   def strip_tags(html), do: filter_tags(html, FastSanitize.Sanitizer.StripTags)
 
-  def get_cached_scrubbed_html_for_activity(
-        content,
-        scrubbers,
-        activity,
-        key \\ "",
-        callback \\ fn x -> x end
-      ) do
-    key = "#{key}#{generate_scrubber_signature(scrubbers)}|#{activity.id}"
-
-    @cachex.fetch!(:scrubber_cache, key, fn _key ->
-      object = Pleroma.Object.normalize(activity, fetch: false)
-      ensure_scrubbed_html(content, scrubbers, object.data["fake"] || false, callback)
-    end)
-  end
-
-  def get_cached_stripped_html_for_activity(content, activity, key) do
-    get_cached_scrubbed_html_for_activity(
-      content,
-      FastSanitize.Sanitizer.StripTags,
-      activity,
-      key,
-      &HtmlEntities.decode/1
-    )
-  end
-
   def ensure_scrubbed_html(
         content,
         scrubbers,
@@ -92,16 +67,6 @@ def ensure_scrubbed_html(
     end
   end
 
-  defp generate_scrubber_signature(scrubber) when is_atom(scrubber) do
-    generate_scrubber_signature([scrubber])
-  end
-
-  defp generate_scrubber_signature(scrubbers) do
-    Enum.reduce(scrubbers, "", fn scrubber, signature ->
-      "#{signature}#{to_string(scrubber)}"
-    end)
-  end
-
   def extract_first_external_url_from_object(%{data: %{"content" => content}} = object)
       when is_binary(content) do
     unless object.data["fake"] do
diff --git a/lib/pleroma/web/mastodon_api/views/status_view.ex b/lib/pleroma/web/mastodon_api/views/status_view.ex
index bac897a57..da2cf0f95 100644
--- a/lib/pleroma/web/mastodon_api/views/status_view.ex
+++ b/lib/pleroma/web/mastodon_api/views/status_view.ex
@@ -254,7 +254,7 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
 
     content_html =
       content
-      |> HTML.get_cached_scrubbed_html_for_activity(
+      |> Activity.HTML.get_cached_scrubbed_html_for_activity(
         User.html_filter_policy(opts[:for]),
         activity,
         "mastoapi:content"
@@ -262,7 +262,7 @@ def render("show.json", %{activity: %{data: %{"object" => _object}} = activity}
 
     content_plaintext =
       content
-      |> HTML.get_cached_stripped_html_for_activity(
+      |> Activity.HTML.get_cached_stripped_html_for_activity(
         activity,
         "mastoapi:content"
       )
diff --git a/lib/pleroma/web/metadata/utils.ex b/lib/pleroma/web/metadata/utils.ex
index de7195435..bc31d66b9 100644
--- a/lib/pleroma/web/metadata/utils.ex
+++ b/lib/pleroma/web/metadata/utils.ex
@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.Metadata.Utils do
+  alias Pleroma.Activity
   alias Pleroma.Emoji
   alias Pleroma.Formatter
   alias Pleroma.HTML
@@ -13,7 +14,7 @@ def scrub_html_and_truncate(%{data: %{"content" => content}} = object) do
     # html content comes from DB already encoded, decode first and scrub after
     |> HtmlEntities.decode()
     |> String.replace(~r/<br\s?\/?>/, " ")
-    |> HTML.get_cached_stripped_html_for_activity(object, "metadata")
+    |> Activity.HTML.get_cached_stripped_html_for_activity(object, "metadata")
     |> Emoji.Formatter.demojify()
     |> HtmlEntities.decode()
     |> Formatter.truncate()