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remote_report_policy.ex
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defmodule Pleroma.Web.ActivityPub.MRF.RemoteReportPolicy do
@moduledoc "Drop remote reports if they don't contain enough information."
@behaviour Pleroma.Web.ActivityPub.MRF.Policy
alias Pleroma.Config
@impl true
def filter(%{"type" => "Flag"} = object) do
with {_, false} <- {:local, local?(object)},
{:ok, _} <- maybe_reject_all(object),
{:ok, _} <- maybe_reject_anonymous(object),
{:ok, _} <- maybe_reject_third_party(object),
{:ok, _} <- maybe_reject_empty_message(object) do
{:ok, object}
else
{:local, true} -> {:ok, object}
{:reject, message} -> {:reject, message}
error -> {:reject, error}
end
end
def filter(object), do: {:ok, object}
defp maybe_reject_all(object) do
if Config.get([:mrf_remote_report, :reject_all]) do
{:reject, "[RemoteReportPolicy] Remote report"}
else
{:ok, object}
end
end
defp maybe_reject_anonymous(%{"actor" => actor} = object) do
with true <- Config.get([:mrf_remote_report, :reject_anonymous]),
%URI{path: "/actor"} <- URI.parse(actor) do
{:reject, "[RemoteReportPolicy] Anonymous: #{actor}"}
else
_ -> {:ok, object}
end
end
defp maybe_reject_third_party(%{"object" => objects} = object) do
{_, to} =
case objects do
[head | tail] when is_binary(head) -> {tail, head}
s when is_binary(s) -> {[], s}
_ -> {[], ""}
end
with true <- Config.get([:mrf_remote_report, :reject_third_party]),
false <- String.starts_with?(to, Pleroma.Web.Endpoint.url()) do
{:reject, "[RemoteReportPolicy] Third-party: #{to}"}
else
_ -> {:ok, object}
end
end
defp maybe_reject_empty_message(%{"content" => content} = object)
when is_binary(content) and content != "" do
{:ok, object}
end
defp maybe_reject_empty_message(object) do
if Config.get([:mrf_remote_report, :reject_empty_message]) do
{:reject, ["RemoteReportPolicy] No content"]}
else
{:ok, object}
end
end
defp local?(%{"actor" => actor}) do
String.starts_with?(actor, Pleroma.Web.Endpoint.url())
end
@impl true
def describe do
mrf_remote_report =
Config.get(:mrf_remote_report)
|> Enum.into(%{})
{:ok, %{mrf_remote_report: mrf_remote_report}}
end
@impl true
def config_description do
%{
key: :mrf_remote_report,
related_policy: "Pleroma.Web.ActivityPub.MRF.RemoteReportPolicy",
label: "MRF Remote Report",
description: "Drop remote reports if they don't contain enough information.",
children: [
%{
key: :reject_all,
type: :boolean,
description: "Reject all remote reports? (this option takes precedence)",
suggestions: [false]
},
%{
key: :reject_anonymous,
type: :boolean,
description: "Reject anonymous remote reports?",
suggestions: [true]
},
%{
key: :reject_third_party,
type: :boolean,
description: "Reject reports on users from third-party instances?",
suggestions: [true]
},
%{
key: :reject_empty_message,
type: :boolean,
description: "Reject remote reports with no message?",
suggestions: [true]
}
]
}
end
end

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