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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.Pipeline do
alias Pleroma.Activity
alias Pleroma.Config
alias Pleroma.Object
alias Pleroma.Repo
alias Pleroma.Utils
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.MRF
alias Pleroma.Web.ActivityPub.ObjectValidator
alias Pleroma.Web.ActivityPub.SideEffects
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.Federator
defp side_effects, do: Config.get([:pipeline, :side_effects], SideEffects)
defp federator, do: Config.get([:pipeline, :federator], Federator)
defp object_validator, do: Config.get([:pipeline, :object_validator], ObjectValidator)
defp mrf, do: Config.get([:pipeline, :mrf], MRF)
defp activity_pub, do: Config.get([:pipeline, :activity_pub], ActivityPub)
defp config, do: Config.get([:pipeline, :config], Config)
@type results :: {:ok, Activity.t() | Object.t(), keyword()}
@type errors :: {:error | :reject, any()}
# The Repo.transaction will wrap the result in an {:ok, _}
# and only returns an {:error, _} if the error encountered was related
# to the SQL transaction
@spec common_pipeline(map(), keyword()) :: results() | errors()
def common_pipeline(object, meta) do
case Repo.transaction(fn -> do_common_pipeline(object, meta) end, Utils.query_timeout()) do
{:ok, {:ok, activity, meta}} ->
side_effects().handle_after_transaction(meta)
{:ok, activity, meta}
{:ok, {:error, _} = error} ->
error
{:ok, {:reject, _} = error} ->
error
{:error, e} ->
{:error, e}
end
end
def do_common_pipeline(%{__struct__: _}, _meta), do: {:error, :is_struct}
def do_common_pipeline(message, meta) do
with {_, {:ok, message, meta}} <- {:validate, object_validator().validate(message, meta)},
{_, {:ok, message, meta}} <- {:mrf, mrf().pipeline_filter(message, meta)},
{_, {:ok, message, meta}} <- {:persist, activity_pub().persist(message, meta)},
{_, {:ok, message, meta}} <- {:side_effects, side_effects().handle(message, meta)},
{_, {:ok, _}} <- {:federation, maybe_federate(message, meta)} do
{:ok, message, meta}
else
{:mrf, {:reject, message, _}} -> {:reject, message}
e -> {:error, e}
end
end
defp maybe_federate(%Object{}, _), do: {:ok, :not_federated}
defp maybe_federate(%Activity{} = activity, meta) do
with {:ok, local} <- Keyword.fetch(meta, :local) do
do_not_federate = meta[:do_not_federate] || !config().get([:instance, :federating])
if !do_not_federate and local and not Visibility.local_public?(activity) do
activity =
if object = Keyword.get(meta, :object_data) do
%{activity | data: Map.put(activity.data, "object", object)}
else
activity
end
federator().publish(activity)
{:ok, :federated}
else
{:ok, :not_federated}
end
else
_e -> {:error, :badarg}
end
end
end

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