floatingghost
07a48b9293
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Co-authored-by: FloatingGhost <hannah@coffee-and-dreams.uk> Reviewed-on: #371
85 lines
2.6 KiB
Elixir
85 lines
2.6 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Activity.HTML do
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alias Pleroma.HTML
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alias Pleroma.Object
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@cachex Pleroma.Config.get([:cachex, :provider], Cachex)
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# We store a list of cache keys related to an activity in a
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# separate cache, scrubber_management_cache. It has the same
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# size as scrubber_cache (see application.ex). Every time we add
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# a cache to scrubber_cache, we update scrubber_management_cache.
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#
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# The most recent write of a certain key in the management cache
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# is the same as the most recent write of any record related to that
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# key in the main cache.
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# Assuming LRW ( https://hexdocs.pm/cachex/Cachex.Policy.LRW.html ),
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# this means when the management cache is evicted by cachex, all
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# related records in the main cache will also have been evicted.
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defp get_cache_keys_for(activity_id) do
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with {:ok, list} when is_list(list) <- @cachex.get(:scrubber_management_cache, activity_id) do
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list
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else
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_ -> []
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end
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end
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defp add_cache_key_for(activity_id, additional_key) do
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current = get_cache_keys_for(activity_id)
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unless additional_key in current do
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@cachex.put(:scrubber_management_cache, activity_id, [additional_key | current])
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end
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end
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def invalidate_cache_for(activity_id) do
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keys = get_cache_keys_for(activity_id)
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for key <- keys do
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@cachex.del(:scrubber_cache, key)
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end
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@cachex.del(:scrubber_management_cache, activity_id)
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end
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def get_cached_scrubbed_html_for_activity(
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content,
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scrubbers,
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activity,
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key \\ "",
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callback \\ fn x -> x end
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) do
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key = "#{key}#{generate_scrubber_signature(scrubbers)}|#{activity.id}"
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@cachex.fetch!(:scrubber_cache, key, fn _key ->
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object = Object.normalize(activity, fetch: false)
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add_cache_key_for(activity.id, key)
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HTML.ensure_scrubbed_html(content, scrubbers, object.data["fake"] || false, callback)
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end)
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end
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def get_cached_stripped_html_for_activity(content, activity, key) do
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get_cached_scrubbed_html_for_activity(
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content,
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FastSanitize.Sanitizer.StripTags,
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activity,
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key,
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&HtmlEntities.decode/1
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)
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end
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defp generate_scrubber_signature(scrubber) when is_atom(scrubber) do
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generate_scrubber_signature([scrubber])
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end
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defp generate_scrubber_signature(scrubbers) do
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Enum.reduce(scrubbers, "", fn scrubber, signature ->
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"#{signature}#{to_string(scrubber)}"
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end)
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end
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end
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