58 lines
1.6 KiB
Elixir
58 lines
1.6 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.ActivityPub.MRF.AntiLinkSpamPolicy do
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alias Pleroma.User
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@behaviour Pleroma.Web.ActivityPub.MRF
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require Logger
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# has the user successfully posted before?
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defp old_user?(%User{} = u) do
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u.note_count > 0 || u.follower_count > 0
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end
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# does the post contain links?
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defp contains_links?(%{"content" => content} = _object) do
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content
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|> Floki.parse_fragment!()
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|> Floki.filter_out("a.mention,a.hashtag,a[rel~=\"tag\"],a.zrl")
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|> Floki.attribute("a", "href")
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|> length() > 0
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end
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defp contains_links?(_), do: false
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@impl true
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def filter(%{"type" => "Create", "actor" => actor, "object" => object} = message) do
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with {:ok, %User{local: false} = u} <- User.get_or_fetch_by_ap_id(actor),
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{:contains_links, true} <- {:contains_links, contains_links?(object)},
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{:old_user, true} <- {:old_user, old_user?(u)} do
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{:ok, message}
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else
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{:ok, %User{local: true}} ->
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{:ok, message}
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{:contains_links, false} ->
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{:ok, message}
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{:old_user, false} ->
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{:reject, "[AntiLinkSpamPolicy] User has no posts nor followers"}
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{:error, _} ->
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{:reject, "[AntiLinkSpamPolicy] Failed to get or fetch user by ap_id"}
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e ->
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{:reject, "[AntiLinkSpamPolicy] Unhandled error #{inspect(e)}"}
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end
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end
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# in all other cases, pass through
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def filter(message), do: {:ok, message}
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@impl true
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def describe, do: {:ok, %{}}
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end
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