705 lines
20 KiB
Elixir
705 lines
20 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
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# SPDX-License-Identifier: AGPL-3.0-only
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# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/web/activity_pub/utils.ex
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defmodule Mobilizon.Federation.ActivityPub.Utils do
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@moduledoc """
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Various ActivityPub related utils.
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"""
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alias Mobilizon.Actors
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Medias.Media
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alias Mobilizon.Federation.ActivityPub
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alias Mobilizon.Federation.ActivityPub.{Activity, Federator, Relay}
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alias Mobilizon.Federation.ActivityPub.Types.Ownable
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alias Mobilizon.Federation.ActivityStream.Converter
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alias Mobilizon.Federation.HTTPSignatures
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alias Mobilizon.Web.Endpoint
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require Logger
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@actor_types ["Group", "Person", "Application"]
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# Some implementations send the actor URI as the actor field, others send the entire actor object,
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# so figure out what the actor's URI is based on what we have.
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def get_url(%{"id" => id}), do: id
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def get_url(id) when is_bitstring(id), do: id
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def get_url(ids) when is_list(ids), do: get_url(hd(ids))
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def get_url(_), do: nil
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def make_json_ld_header do
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%{
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"@context" => [
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"https://www.w3.org/ns/activitystreams",
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"https://litepub.social/context.jsonld",
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%{
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"sc" => "http://schema.org#",
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"ical" => "http://www.w3.org/2002/12/cal/ical#",
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"pt" => "https://joinpeertube.org/ns#",
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"toot" => "http://joinmastodon.org/ns#",
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"discoverable" => "toot:discoverable",
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"manuallyApprovesFollowers" => "as:manuallyApprovesFollowers",
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"Hashtag" => "as:Hashtag",
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"category" => "sc:category",
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"uuid" => "sc:identifier",
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"maximumAttendeeCapacity" => "sc:maximumAttendeeCapacity",
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"location" => %{
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"@id" => "sc:location",
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"@type" => "sc:Place"
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},
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"PostalAddress" => "sc:PostalAddress",
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"address" => %{
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"@id" => "sc:address",
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"@type" => "sc:PostalAddress"
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},
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"addressCountry" => "sc:addressCountry",
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"addressRegion" => "sc:addressRegion",
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"postalCode" => "sc:postalCode",
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"addressLocality" => "sc:addressLocality",
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"streetAddress" => "sc:streetAddress",
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"mz" => "https://joinmobilizon.org/ns#",
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"repliesModerationOptionType" => %{
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"@id" => "mz:repliesModerationOptionType",
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"@type" => "rdfs:Class"
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},
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"repliesModerationOption" => %{
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"@id" => "mz:repliesModerationOption",
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"@type" => "mz:repliesModerationOptionType"
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},
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"commentsEnabled" => %{
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"@type" => "sc:Boolean",
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"@id" => "pt:commentsEnabled"
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},
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"joinModeType" => %{
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"@id" => "mz:joinModeType",
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"@type" => "rdfs:Class"
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},
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"joinMode" => %{
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"@id" => "mz:joinMode",
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"@type" => "mz:joinModeType"
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},
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"anonymousParticipationEnabled" => %{
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"@id" => "mz:anonymousParticipationEnabled",
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"@type" => "sc:Boolean"
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},
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"participationMessage" => %{
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"@id" => "mz:participationMessage",
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"@type" => "sc:Text"
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}
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}
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]
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}
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end
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def make_date do
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DateTime.utc_now() |> DateTime.truncate(:second) |> DateTime.to_iso8601()
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end
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@doc """
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Enqueues an activity for federation if it's local
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"""
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def maybe_federate(%Activity{local: true} = activity) do
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Logger.debug("Maybe federate an activity")
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if Mobilizon.Config.get!([:instance, :federating]) do
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priority =
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case activity.data["type"] do
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"Delete" -> 10
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"Create" -> 1
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_ -> 5
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end
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Federator.enqueue(:publish, activity, priority)
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end
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:ok
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end
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def maybe_federate(_), do: :ok
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@doc """
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Applies to activities sent by group members from outside this instance to a group of this instance,
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we then need to relay (`Announce`) the object to other members on other instances.
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"""
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def maybe_relay_if_group_activity(activity, attributed_to \\ nil)
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def maybe_relay_if_group_activity(
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%Activity{data: %{"object" => object}},
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_attributed_to
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)
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when is_map(object) do
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do_maybe_relay_if_group_activity(object, object["attributedTo"])
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end
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# When doing a delete the object is just an AP ID string, so we pass the attributed_to actor as well
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def maybe_relay_if_group_activity(
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%Activity{data: %{"object" => object}},
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%Actor{url: attributed_to_url}
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)
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when is_binary(object) do
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do_maybe_relay_if_group_activity(object, attributed_to_url)
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end
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def maybe_relay_if_group_activity(_activity, _attributedTo) do
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:ok
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end
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defp do_maybe_relay_if_group_activity(object, attributed_to) when is_list(attributed_to),
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do: do_maybe_relay_if_group_activity(object, hd(attributed_to))
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defp do_maybe_relay_if_group_activity(object, attributed_to) when is_binary(attributed_to) do
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id = "#{Endpoint.url()}/announces/#{Ecto.UUID.generate()}"
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case Actors.get_local_group_by_url(attributed_to) do
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%Actor{} = group ->
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case ActivityPub.announce(group, object, id, true, false) do
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{:ok, _activity, _object} ->
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Logger.info("Forwarded activity to external members of the group")
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:ok
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_ ->
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Logger.info("Failed to forward activity to external members of the group")
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:error
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end
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_ ->
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:ok
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end
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end
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defp do_maybe_relay_if_group_activity(_, _), do: :ok
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@spec remote_actors(list(String.t())) :: list(Actor.t())
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def remote_actors(recipients) do
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recipients
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|> Enum.map(fn url -> ActivityPub.get_or_fetch_actor_by_url(url) end)
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|> Enum.map(fn {status, actor} ->
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case status do
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:ok ->
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actor
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_ ->
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nil
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end
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end)
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|> Enum.map(& &1)
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|> Enum.filter(fn actor -> actor && !is_nil(actor.domain) end)
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end
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@doc """
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Adds an id and a published data if they aren't there,
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also adds it to an included object
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"""
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def lazy_put_activity_defaults(%{"object" => _object} = map) do
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if is_map(map["object"]) do
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object = lazy_put_object_defaults(map["object"])
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%{map | "object" => object}
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else
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map
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end
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end
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@doc """
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Adds an id and published date if they aren't there.
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"""
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def lazy_put_object_defaults(map) when is_map(map) do
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Map.put_new_lazy(map, "published", &make_date/0)
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end
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def get_actor(%{"actor" => actor}) when is_binary(actor) do
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actor
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end
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def get_actor(%{"actor" => actor}) when is_list(actor) do
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if is_binary(Enum.at(actor, 0)) do
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Enum.at(actor, 0)
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else
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actor
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|> Enum.find(fn %{"type" => type} -> type in ["Person", "Service", "Application"] end)
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|> Map.get("id")
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end
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end
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def get_actor(%{"actor" => %{"id" => id}}) when is_bitstring(id) do
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id
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end
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def get_actor(%{"actor" => nil, "attributedTo" => actor}) when not is_nil(actor) do
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get_actor(%{"actor" => actor})
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end
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@doc """
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Checks that an incoming AP object's actor matches the domain it came from.
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Takes the actor or attributedTo attributes (considers only the first elem if they're an array)
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"""
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def origin_check?(id, %{"actor" => actor, "attributedTo" => _attributed_to} = params)
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when not is_nil(actor) and actor != "" do
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params = Map.delete(params, "attributedTo")
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origin_check?(id, params)
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end
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def origin_check?(id, %{"attributedTo" => actor} = params) do
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params = params |> Map.put("actor", actor) |> Map.delete("attributedTo")
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origin_check?(id, params)
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end
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def origin_check?(id, %{"actor" => actor} = params)
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when not is_nil(actor) and is_list(actor) and length(actor) > 0 do
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origin_check?(id, Map.put(params, "actor", hd(actor)))
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end
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def origin_check?(id, %{"actor" => actor} = params)
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when not is_nil(actor) do
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actor = get_actor(params)
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Logger.debug("Performing origin check on #{id} and #{actor} URIs")
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are_same_origin?(id, actor)
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end
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def origin_check?(_id, %{"type" => type} = _params) when type in ["Actor", "Group"], do: true
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def origin_check?(_id, %{"actor" => nil} = _args), do: false
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def origin_check?(_id, _args), do: false
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@spec are_same_origin?(String.t(), String.t()) :: boolean()
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def are_same_origin?(url_1, url_2) when is_binary(url_1) and is_binary(url_2) do
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uri_1 = URI.parse(url_1)
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uri_2 = URI.parse(url_2)
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compare_uris?(uri_1, uri_2)
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end
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defp compare_uris?(%URI{} = id_uri, %URI{} = other_uri),
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do: id_uri.host == other_uri.host && id_uri.port == other_uri.port
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@spec origin_check_from_id?(String.t(), String.t()) :: boolean()
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def origin_check_from_id?(id, other_id) when is_binary(other_id) do
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id_uri = URI.parse(id)
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other_uri = URI.parse(other_id)
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compare_uris?(id_uri, other_uri)
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end
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@spec origin_check_from_id?(String.t(), map()) :: boolean()
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def origin_check_from_id?(id, %{"id" => other_id} = _params) when is_binary(other_id),
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do: origin_check_from_id?(id, other_id)
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def activity_actor_is_group_member?(
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%Actor{id: actor_id, url: actor_url},
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object,
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role \\ :member
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) do
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case Ownable.group_actor(object) do
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%Actor{type: :Group, id: group_id, url: group_url} ->
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Logger.debug("Group object url is #{group_url}")
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case role do
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:moderator ->
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Logger.debug(
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"Checking if activity actor #{actor_url} is a moderator from group from #{
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object.url
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}"
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)
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Actors.is_moderator?(actor_id, group_id)
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:administrator ->
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Logger.debug(
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"Checking if activity actor #{actor_url} is an administrator from group from #{
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object.url
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}"
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)
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Actors.is_administrator?(actor_id, group_id)
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_ ->
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Logger.debug(
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"Checking if activity actor #{actor_url} is a member from group from #{object.url}"
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)
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Actors.is_member?(actor_id, group_id)
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end
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_ ->
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false
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end
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end
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@doc """
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Return AS Link data from
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* a `Plug.Upload` struct, stored an returned
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* a `Media`, directly returned
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* a map containing media information, stored, saved and returned
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Save media data from %Plug.Upload{} and return AS Link data.
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"""
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def make_media_data(%Plug.Upload{} = media, opts) do
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case Mobilizon.Web.Upload.store(media, opts) do
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{:ok, media} ->
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media
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_ ->
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nil
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end
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end
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def make_media_data(%Media{} = media) do
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Converter.Media.model_to_as(media)
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end
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def make_media_data(media) when is_map(media) do
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with {:ok, %{"url" => [%{"href" => url, "mediaType" => content_type}], "size" => size}} <-
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Mobilizon.Web.Upload.store(media.file),
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{:media_exists, nil} <- {:media_exists, Mobilizon.Medias.get_media_by_url(url)},
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{:ok, %Media{file: _file} = media} <-
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Mobilizon.Medias.create_media(%{
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"file" => %{
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"url" => url,
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"name" => media.name,
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"content_type" => content_type,
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"size" => size
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},
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"actor_id" => media.actor_id
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}) do
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Converter.Media.model_to_as(media)
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else
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{:media_exists, %Media{file: _file} = media} ->
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Converter.Media.model_to_as(media)
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err ->
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err
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end
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end
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def make_media_data(nil), do: nil
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@doc """
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Make announce activity data for the given actor and object
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"""
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def make_announce_data(actor, object, activity_id, public \\ true)
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def make_announce_data(
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%Actor{} = actor,
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%{"id" => url, "type" => type} = _object,
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activity_id,
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public
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)
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when type in @actor_types do
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do_make_announce_data(actor, url, url, activity_id, public)
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end
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def make_announce_data(
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%Actor{} = actor,
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%{"actor" => object_actor_url} = object,
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activity_id,
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public
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) do
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do_make_announce_data(
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actor,
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object_actor_url,
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object,
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activity_id,
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public
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)
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end
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defp do_make_announce_data(
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%Actor{type: actor_type} = actor,
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object_actor_url,
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object,
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activity_id,
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public
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) do
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{to, cc} =
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if public do
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{[actor.followers_url, object_actor_url],
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["https://www.w3.org/ns/activitystreams#Public"]}
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else
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if actor_type == :Group do
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to =
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(object["to"] || [])
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|> MapSet.new()
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|> MapSet.intersection(MapSet.new([actor.followers_url, actor.members_url]))
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|> MapSet.to_list()
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{to, []}
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else
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{[actor.followers_url], []}
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end
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end
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data = %{
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"type" => "Announce",
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"actor" => actor.url,
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"object" => object,
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"to" => to,
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"cc" => cc
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}
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if activity_id, do: Map.put(data, "id", activity_id), else: data
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end
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@doc """
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Make unannounce activity data for the given actor and object
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"""
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def make_unannounce_data(
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%Actor{url: url} = actor,
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activity,
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activity_id
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) do
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data = %{
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"type" => "Undo",
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"actor" => url,
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"object" => activity,
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"to" => [actor.followers_url, actor.url],
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"cc" => ["https://www.w3.org/ns/activitystreams#Public"]
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}
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if activity_id, do: Map.put(data, "id", activity_id), else: data
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end
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#### Unfollow-related helpers
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@spec make_unfollow_data(Actor.t(), Actor.t(), map(), String.t()) :: map()
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def make_unfollow_data(
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%Actor{url: follower_url},
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%Actor{url: followed_url},
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follow_activity,
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activity_id
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) do
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data = %{
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"type" => "Undo",
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"actor" => follower_url,
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"to" => [followed_url],
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"object" => follow_activity.data
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}
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if activity_id, do: Map.put(data, "id", activity_id), else: data
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end
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#### Create-related helpers
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@doc """
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Make create activity data
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"""
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@spec make_create_data(map(), map()) :: map()
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def make_create_data(object, additional \\ %{}) do
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Logger.debug("Making create data")
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Logger.debug(inspect(object))
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Logger.debug(inspect(additional))
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%{
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"type" => "Create",
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"to" => object["to"],
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"cc" => object["cc"],
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"attributedTo" => object["attributedTo"] || object["actor"],
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"actor" => object["actor"],
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"object" => object,
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"published" => make_date(),
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"id" => object["id"] <> "/activity"
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}
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|> Map.merge(additional)
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end
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@doc """
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Make update activity data
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"""
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@spec make_update_data(map(), map()) :: map()
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def make_update_data(object, additional \\ %{}) do
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Logger.debug("Making update data")
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Logger.debug(inspect(object))
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Logger.debug(inspect(additional))
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%{
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"type" => "Update",
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"to" => object["to"],
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"cc" => object["cc"],
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"actor" => object["actor"],
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"object" => object,
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"id" => object["id"] <> "/activity"
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}
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|> Map.merge(additional)
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end
|
|
|
|
@doc """
|
|
Make accept join activity data
|
|
"""
|
|
@spec make_accept_join_data(map(), map()) :: map()
|
|
def make_accept_join_data(object, additional \\ %{}) do
|
|
%{
|
|
"type" => "Accept",
|
|
"to" => object["to"],
|
|
"cc" => object["cc"],
|
|
"object" => object,
|
|
"id" => object["id"] <> "/activity"
|
|
}
|
|
|> Map.merge(additional)
|
|
end
|
|
|
|
@doc """
|
|
Make add activity data
|
|
"""
|
|
@spec make_add_data(map(), map()) :: map()
|
|
def make_add_data(object, target, additional \\ %{}) do
|
|
Logger.debug("Making add data")
|
|
Logger.debug(inspect(object))
|
|
Logger.debug(inspect(additional))
|
|
|
|
%{
|
|
"type" => "Add",
|
|
"to" => object["to"],
|
|
"cc" => object["cc"],
|
|
"actor" => object["actor"],
|
|
"object" => object,
|
|
"target" => Map.get(target, :url, target),
|
|
"id" => object["id"] <> "/add"
|
|
}
|
|
|> Map.merge(additional)
|
|
end
|
|
|
|
@doc """
|
|
Make move activity data
|
|
"""
|
|
@spec make_add_data(map(), map()) :: map()
|
|
def make_move_data(object, origin, target, additional \\ %{}) do
|
|
Logger.debug("Making move data")
|
|
Logger.debug(inspect(object))
|
|
Logger.debug(inspect(origin))
|
|
Logger.debug(inspect(target))
|
|
Logger.debug(inspect(additional))
|
|
|
|
%{
|
|
"type" => "Move",
|
|
"to" => object["to"],
|
|
"cc" => object["cc"],
|
|
"actor" => object["actor"],
|
|
"object" => object,
|
|
"origin" => if(is_nil(origin), do: origin, else: Map.get(origin, :url, origin)),
|
|
"target" => if(is_nil(target), do: target, else: Map.get(target, :url, target)),
|
|
"id" => object["id"] <> "/move"
|
|
}
|
|
|> Map.merge(additional)
|
|
end
|
|
|
|
@doc """
|
|
Converts PEM encoded keys to a public key representation
|
|
"""
|
|
def pem_to_public_key(pem) do
|
|
[key_code] = :public_key.pem_decode(pem)
|
|
key = :public_key.pem_entry_decode(key_code)
|
|
|
|
case key do
|
|
{:RSAPrivateKey, _, modulus, exponent, _, _, _, _, _, _, _} ->
|
|
{:RSAPublicKey, modulus, exponent}
|
|
|
|
{:RSAPublicKey, modulus, exponent} ->
|
|
{:RSAPublicKey, modulus, exponent}
|
|
end
|
|
end
|
|
|
|
def pem_to_public_key_pem(pem) do
|
|
public_key = pem_to_public_key(pem)
|
|
public_key = :public_key.pem_entry_encode(:RSAPublicKey, public_key)
|
|
:public_key.pem_encode([public_key])
|
|
end
|
|
|
|
def make_signature(actor, id, date) do
|
|
uri = URI.parse(id)
|
|
|
|
signature =
|
|
actor
|
|
|> HTTPSignatures.Signature.sign(%{
|
|
"(request-target)": "get #{uri.path}",
|
|
host: uri.host,
|
|
date: date
|
|
})
|
|
|
|
[{:Signature, signature}]
|
|
end
|
|
|
|
@doc """
|
|
Sign a request with the instance Relay actor.
|
|
"""
|
|
@spec sign_fetch_relay(Enum.t(), String.t(), String.t()) :: Enum.t()
|
|
def sign_fetch_relay(headers, id, date) do
|
|
with %Actor{} = actor <- Relay.get_actor() do
|
|
sign_fetch(headers, actor, id, date)
|
|
end
|
|
end
|
|
|
|
@doc """
|
|
Sign a request with an actor.
|
|
"""
|
|
@spec sign_fetch(Enum.t(), Actor.t(), String.t(), String.t()) :: Enum.t()
|
|
def sign_fetch(headers, actor, id, date) do
|
|
if Mobilizon.Config.get([:activitypub, :sign_object_fetches]) do
|
|
headers ++ make_signature(actor, id, date)
|
|
else
|
|
headers
|
|
end
|
|
end
|
|
|
|
@doc """
|
|
Add the Date header to the request if we sign object fetches
|
|
"""
|
|
@spec maybe_date_fetch(Enum.t(), String.t()) :: Enum.t()
|
|
def maybe_date_fetch(headers, date) do
|
|
if Mobilizon.Config.get([:activitypub, :sign_object_fetches]) do
|
|
headers ++ [{:Date, date}]
|
|
else
|
|
headers
|
|
end
|
|
end
|
|
|
|
def check_for_actor_key_rotation(%Actor{} = actor) do
|
|
if Actors.should_rotate_actor_key(actor) do
|
|
Actors.schedule_key_rotation(
|
|
actor,
|
|
Application.get_env(:mobilizon, :activitypub)[:actor_key_rotation_delay]
|
|
)
|
|
end
|
|
|
|
:ok
|
|
end
|
|
|
|
def can_update_group_object?(%Actor{} = actor, object) do
|
|
can_manage_group_object?(:role_needed_to_update, actor, object)
|
|
end
|
|
|
|
def can_delete_group_object?(%Actor{} = actor, object) do
|
|
can_manage_group_object?(:role_needed_to_delete, actor, object)
|
|
end
|
|
|
|
@spec can_manage_group_object?(
|
|
:role_needed_to_update | :role_needed_to_delete,
|
|
Actor.t(),
|
|
any()
|
|
) :: boolean()
|
|
defp can_manage_group_object?(action_function, %Actor{url: actor_url} = actor, object) do
|
|
if Ownable.group_actor(object) != nil do
|
|
case apply(Ownable, action_function, [object]) do
|
|
role when role in [:member, :moderator, :administrator] ->
|
|
activity_actor_is_group_member?(actor, object, role)
|
|
|
|
_ ->
|
|
case action_function do
|
|
:role_needed_to_update ->
|
|
Logger.warn("Actor #{actor_url} can't update #{object.url}")
|
|
|
|
:role_needed_to_delete ->
|
|
Logger.warn("Actor #{actor_url} can't delete #{object.url}")
|
|
end
|
|
|
|
false
|
|
end
|
|
else
|
|
true
|
|
end
|
|
end
|
|
end
|