-
- @doc """
- Get sanitized HTML from cache, or scrub it and save to cache.
- """
- def get_scrubbed_html(
- content,
- scrubbers,
- %{data: %{"object" => object}} = activity
- ) do
- scrubber_cache =
- if object["scrubber_cache"] != nil and is_list(object["scrubber_cache"]) do
- object["scrubber_cache"]
- else
- []
- end
-
- key = generate_scrubber_key(scrubbers)
-
- {new_scrubber_cache, scrubbed_html} =
- Enum.map_reduce(scrubber_cache, nil, fn %{
- "scrubbers" => current_key,
- "content" => current_content
- } = current_element,
- _content ->
- if Map.keys(current_key) == Map.keys(key) do
- if current_key == key do
- {current_element, current_content}
- else
- # Remove the entry if scrubber version is outdated
- {nil, nil}
- end
- end
- end)
-
- new_scrubber_cache = Enum.reject(new_scrubber_cache, &is_nil/1)
- if scrubbed_html == nil or new_scrubber_cache != scrubber_cache do
- scrubbed_html = HTML.filter_tags(content, scrubbers)
- new_scrubber_cache = [%{:scrubbers => key, :content => scrubbed_html} | new_scrubber_cache]
- update_scrubber_cache(activity, new_scrubber_cache)
- scrubbed_html
- else
- scrubbed_html
- end
- end
-
- defp generate_scrubber_key(scrubbers) do
- Enum.reduce(scrubbers, %{}, fn scrubber, acc ->
- Map.put(acc, to_string(scrubber), scrubber.version)
- end)
- end
-
- defp update_scrubber_cache(activity, scrubber_cache) do
- cng = Object.change(activity, %{data: Kernel.put_in(activity.data, ["object", "scrubber_cache"], scrubber_cache)})
- {:ok, _struct} = Repo.update(cng)
- end