432 lines
11 KiB
Elixir
432 lines
11 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.Service.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.Media.Picture
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alias Mobilizon.Service.ActivityPub.{Activity, Converter}
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alias Mobilizon.Service.Federator
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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(_), 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/litepub/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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"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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"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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"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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}
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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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def remote_actors(%{data: %{"to" => to} = data}) do
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to = to ++ (data["cc"] || [])
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to
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|> Enum.map(fn url -> Actors.get_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(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) 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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"""
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def origin_check?(id, %{"actor" => actor} = params) when not is_nil(actor) do
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id_uri = URI.parse(id)
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actor_uri = URI.parse(get_actor(params))
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compare_uris?(actor_uri, id_uri)
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end
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def origin_check?(_id, %{"actor" => nil}), do: false
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def origin_check?(id, %{"attributedTo" => actor} = params),
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do: origin_check?(id, Map.put(params, "actor", actor))
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def origin_check?(_id, _data), do: false
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defp compare_uris?(%URI{} = id_uri, %URI{} = other_uri), do: id_uri.host == other_uri.host
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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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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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@doc """
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Save picture data from %Plug.Upload{} and return AS Link data.
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"""
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def make_picture_data(%Plug.Upload{} = picture, opts) do
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case MobilizonWeb.Upload.store(picture, opts) do
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{:ok, picture} ->
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picture
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_ ->
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nil
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end
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end
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@doc """
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Convert a picture model into an AS Link representation.
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"""
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def make_picture_data(%Picture{} = picture) do
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Converter.Picture.model_to_as(picture)
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end
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@doc """
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Save picture data from raw data and return AS Link data.
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"""
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def make_picture_data(picture) when is_map(picture) do
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with {:ok, %{"url" => [%{"href" => url, "mediaType" => content_type}], "size" => size}} <-
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MobilizonWeb.Upload.store(picture.file),
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{:picture_exists, nil} <- {:picture_exists, Mobilizon.Media.get_picture_by_url(url)},
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{:ok, %Picture{file: _file} = picture} <-
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Mobilizon.Media.create_picture(%{
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"file" => %{
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"url" => url,
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"name" => picture.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" => picture.actor_id
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}) do
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Converter.Picture.model_to_as(picture)
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else
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{:picture_exists, %Picture{file: _file} = picture} ->
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Converter.Picture.model_to_as(picture)
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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_picture_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{url: actor_url, followers_url: actor_followers_url} = _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, actor_followers_url, url, url, activity_id, public)
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end
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def make_announce_data(
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%Actor{url: actor_url, followers_url: actor_followers_url} = _actor,
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%{"id" => url, "type" => type, "actor" => object_actor_url} = _object,
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activity_id,
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public
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)
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when type in ["Note", "Event"] do
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do_make_announce_data(
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actor_url,
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actor_followers_url,
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object_actor_url,
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url,
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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_url,
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actor_followers_url,
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object_actor_url,
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object_url,
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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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{[actor_followers_url], []}
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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_url,
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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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"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
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@doc """
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Make accept join activity data
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"""
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@spec make_accept_join_data(map(), map()) :: map()
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def make_accept_join_data(object, additional \\ %{}) do
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%{
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"type" => "Accept",
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"to" => object["to"],
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"cc" => object["cc"],
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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
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@doc """
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Converts PEM encoded keys to a public key representation
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"""
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def pem_to_public_key(pem) do
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[key_code] = :public_key.pem_decode(pem)
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key = :public_key.pem_entry_decode(key_code)
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case key do
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{:RSAPrivateKey, _, modulus, exponent, _, _, _, _, _, _, _} ->
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{:RSAPublicKey, modulus, exponent}
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{:RSAPublicKey, modulus, exponent} ->
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{:RSAPublicKey, modulus, exponent}
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end
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end
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def pem_to_public_key_pem(pem) do
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public_key = pem_to_public_key(pem)
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public_key = :public_key.pem_entry_encode(:RSAPublicKey, public_key)
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:public_key.pem_encode([public_key])
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end
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defp make_signature(id, date) do
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uri = URI.parse(id)
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signature =
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Mobilizon.Service.ActivityPub.Relay.get_actor()
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|> Mobilizon.Service.HTTPSignatures.Signature.sign(%{
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"(request-target)": "get #{uri.path}",
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host: uri.host,
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date: date
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})
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[{:Signature, signature}]
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end
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def sign_fetch(headers, id, date) do
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if Mobilizon.Config.get([:activitypub, :sign_object_fetches]) do
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headers ++ make_signature(id, date)
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else
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headers
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end
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end
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def maybe_date_fetch(headers, date) do
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if Mobilizon.Config.get([:activitypub, :sign_object_fetches]) do
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headers ++ [{:Date, date}]
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else
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headers
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end
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end
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end
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