573 lines
20 KiB
Elixir
573 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/transmogrifier.ex
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defmodule Mobilizon.Federation.ActivityPub.Transmogrifier do
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@moduledoc """
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A module to handle coding from internal to wire ActivityPub and back.
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"""
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alias Mobilizon.Actors
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alias Mobilizon.Actors.{Actor, Follower}
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alias Mobilizon.Events
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alias Mobilizon.Events.{Comment, Event, Participant}
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alias Mobilizon.Federation.ActivityPub
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alias Mobilizon.Federation.ActivityPub.{Activity, Utils}
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alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
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alias Mobilizon.Web.Email.Participation
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require Logger
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def handle_incoming(%{"id" => nil}), do: :error
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def handle_incoming(%{"id" => ""}), do: :error
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def handle_incoming(%{"type" => "Flag"} = data) do
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with params <- Converter.Flag.as_to_model(data) do
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params = %{
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reporter_id: params["reporter"].id,
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reported_id: params["reported"].id,
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comments_ids: params["comments"] |> Enum.map(& &1.id),
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content: params["content"] || "",
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additional: %{
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"cc" => [params["reported"].url]
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},
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event_id: if(is_nil(params["event"]), do: nil, else: params["event"].id || nil),
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local: false
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}
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ActivityPub.flag(params, false)
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end
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end
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@doc """
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Handles a `Create` activity for `Note` (comments) objects
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The following actions are performed
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* Fetch the author of the activity
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* Convert the ActivityStream data to the comment model format (it also finds and inserts tags)
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* Get (by it's URL) or create the comment with this data
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* Insert eventual mentions in the database
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* Convert the comment back in ActivityStreams data
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* Wrap this data back into a `Create` activity
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* Return the activity and the comment object
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"""
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def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object}) do
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Logger.info("Handle incoming to create notes")
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with {:ok, object_data} <-
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object |> Converter.Comment.as_to_model_data(),
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{:existing_comment, {:error, :comment_not_found}} <-
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{:existing_comment, Events.get_comment_from_url_with_preload(object_data.url)},
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{:ok, %Activity{} = activity, %Comment{} = comment} <-
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ActivityPub.create(:comment, object_data, false) do
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{:ok, activity, comment}
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else
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{:existing_comment, {:ok, %Comment{} = comment}} ->
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{:ok, nil, comment}
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end
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end
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@doc """
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Handles a `Create` activity for `Event` objects
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The following actions are performed
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* Fetch the author of the activity
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* Convert the ActivityStream data to the event model format (it also finds and inserts tags)
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* Get (by it's URL) or create the event with this data
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* Insert eventual mentions in the database
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* Convert the event back in ActivityStreams data
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* Wrap this data back into a `Create` activity
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* Return the activity and the event object
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"""
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def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Event"} = object}) do
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Logger.info("Handle incoming to create event")
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with {:ok, object_data} <-
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object |> Converter.Event.as_to_model_data(),
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{:existing_event, nil} <- {:existing_event, Events.get_event_by_url(object_data.url)},
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{:ok, %Activity{} = activity, %Event{} = event} <-
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ActivityPub.create(:event, object_data, false) do
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{:ok, activity, event}
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else
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{:existing_event, %Event{} = event} -> {:ok, nil, event}
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end
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end
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def handle_incoming(
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%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = _data
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) do
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with {:ok, %Actor{} = followed} <- ActivityPub.get_or_fetch_actor_by_url(followed, true),
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{:ok, %Actor{} = follower} <- ActivityPub.get_or_fetch_actor_by_url(follower),
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{:ok, activity, object} <- ActivityPub.follow(follower, followed, id, false) do
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{:ok, activity, object}
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else
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e ->
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Logger.warn("Unable to handle Follow activity #{inspect(e)}")
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:error
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end
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end
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def handle_incoming(
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%{
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"type" => "Accept",
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"object" => accepted_object,
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"actor" => _actor,
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"id" => id
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} = data
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) do
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with actor_url <- Utils.get_actor(data),
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{:ok, %Actor{} = actor} <- ActivityPub.get_or_fetch_actor_by_url(actor_url),
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{:object_not_found, {:ok, %Activity{} = activity, object}} <-
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{:object_not_found,
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do_handle_incoming_accept_following(accepted_object, actor) ||
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do_handle_incoming_accept_join(accepted_object, actor)} do
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{:ok, activity, object}
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else
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{:object_not_found, nil} ->
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Logger.warn(
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"Unable to process Accept activity #{inspect(id)}. Object #{inspect(accepted_object)} wasn't found."
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)
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:error
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e ->
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Logger.warn(
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"Unable to process Accept activity #{inspect(id)} for object #{inspect(accepted_object)} only returned #{
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inspect(e)
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}"
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)
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:error
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end
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end
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def handle_incoming(
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%{"type" => "Reject", "object" => rejected_object, "actor" => _actor, "id" => id} = data
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) do
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with actor_url <- Utils.get_actor(data),
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{:ok, %Actor{} = actor} <- ActivityPub.get_or_fetch_actor_by_url(actor_url),
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{:object_not_found, {:ok, activity, object}} <-
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{:object_not_found,
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do_handle_incoming_reject_following(rejected_object, actor) ||
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do_handle_incoming_reject_join(rejected_object, actor)} do
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{:ok, activity, object}
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else
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{:object_not_found, nil} ->
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Logger.warn(
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"Unable to process Reject activity #{inspect(id)}. Object #{inspect(rejected_object)} wasn't found."
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)
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:error
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e ->
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Logger.warn(
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"Unable to process Reject activity #{inspect(id)} for object #{inspect(rejected_object)} only returned #{
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inspect(e)
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}"
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)
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:error
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end
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end
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def handle_incoming(
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%{"type" => "Announce", "object" => object, "actor" => _actor, "id" => _id} = data
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) do
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with actor <- Utils.get_actor(data),
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# TODO: Is the following line useful?
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{:ok, %Actor{id: actor_id} = _actor} <- ActivityPub.get_or_fetch_actor_by_url(actor),
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:ok <- Logger.debug("Fetching contained object"),
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{:ok, object} <- fetch_obj_helper_as_activity_streams(object),
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:ok <- Logger.debug("Handling contained object"),
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create_data <- Utils.make_create_data(object),
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:ok <- Logger.debug(inspect(object)),
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{:ok, _activity, entity} <- handle_incoming(create_data),
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:ok <- Logger.debug("Finished processing contained object"),
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{:ok, activity} <- ActivityPub.create_activity(data, false),
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{:ok, %Actor{id: object_owner_actor_id}} <- Actors.get_actor_by_url(object["actor"]),
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{:ok, %Mobilizon.Share{} = _share} <-
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Mobilizon.Share.create(object["id"], actor_id, object_owner_actor_id) do
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{:ok, activity, entity}
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else
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e ->
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Logger.debug(inspect(e))
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:error
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end
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end
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def handle_incoming(%{
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"type" => "Update",
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"object" => %{"type" => object_type} = object,
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"actor" => _actor_id
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})
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when object_type in ["Person", "Group", "Application", "Service", "Organization"] do
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with {:ok, %Actor{} = old_actor} <- Actors.get_actor_by_url(object["id"]),
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{:ok, object_data} <-
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object |> Converter.Actor.as_to_model_data(),
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{:ok, %Activity{} = activity, %Actor{} = new_actor} <-
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ActivityPub.update(:actor, old_actor, object_data, false) do
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{:ok, activity, new_actor}
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else
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e ->
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Logger.debug(inspect(e))
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:error
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end
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end
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def handle_incoming(
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%{"type" => "Update", "object" => %{"type" => "Event"} = object, "actor" => _actor} =
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update_data
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) do
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with actor <- Utils.get_actor(update_data),
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{:ok, %Actor{url: actor_url}} <- Actors.get_actor_by_url(actor),
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{:ok, %Event{} = old_event} <-
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object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
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{:ok, object_data} <- Converter.Event.as_to_model_data(object),
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{:origin_check, true} <- {:origin_check, Utils.origin_check?(actor_url, update_data)},
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{:ok, %Activity{} = activity, %Event{} = new_event} <-
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ActivityPub.update(:event, old_event, object_data, false) do
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{:ok, activity, new_event}
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else
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_e ->
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:error
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end
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end
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def handle_incoming(
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%{
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"type" => "Undo",
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"object" => %{
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"type" => "Announce",
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"object" => object_id,
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"id" => cancelled_activity_id
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},
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"actor" => _actor,
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"id" => id
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} = data
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) do
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with actor <- Utils.get_actor(data),
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{:ok, %Actor{} = actor} <- ActivityPub.get_or_fetch_actor_by_url(actor),
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{:ok, object} <- fetch_obj_helper_as_activity_streams(object_id),
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{:ok, activity, object} <-
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ActivityPub.unannounce(actor, object, id, cancelled_activity_id, false) do
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{:ok, activity, object}
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else
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_e -> :error
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end
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end
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def handle_incoming(
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%{
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"type" => "Undo",
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"object" => %{"type" => "Follow", "object" => followed},
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"actor" => follower,
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"id" => id
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} = _data
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) do
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with {:ok, %Actor{domain: nil} = followed} <- Actors.get_actor_by_url(followed),
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{:ok, %Actor{} = follower} <- Actors.get_actor_by_url(follower),
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{:ok, activity, object} <- ActivityPub.unfollow(follower, followed, id, false) do
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{:ok, activity, object}
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else
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e ->
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Logger.debug(inspect(e))
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:error
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end
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end
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# TODO: We presently assume that any actor on the same origin domain as the object being
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# deleted has the rights to delete that object. A better way to validate whether or not
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# the object should be deleted is to refetch the object URI, which should return either
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# an error or a tombstone. This would allow us to verify that a deletion actually took
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# place.
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def handle_incoming(
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%{"type" => "Delete", "object" => object, "actor" => _actor, "id" => _id} = data
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) do
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with actor <- Utils.get_actor(data),
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{:ok, %Actor{url: actor_url}} <- Actors.get_actor_by_url(actor),
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object_id <- Utils.get_url(object),
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{:origin_check, true} <-
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{:origin_check, Utils.origin_check_from_id?(actor_url, object_id)},
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{:ok, object} <- ActivityPub.fetch_object_from_url(object_id),
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{:ok, activity, object} <- ActivityPub.delete(object, false) do
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{:ok, activity, object}
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else
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{:origin_check, false} ->
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Logger.warn("Object origin check failed")
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:error
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e ->
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Logger.debug(inspect(e))
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:error
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end
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end
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def handle_incoming(
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%{
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"type" => "Join",
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"object" => object,
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"actor" => _actor,
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"id" => id,
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"participationMessage" => note
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} = data
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) do
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with actor <- Utils.get_actor(data),
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{:ok, %Actor{url: _actor_url} = actor} <- Actors.get_actor_by_url(actor),
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object <- Utils.get_url(object),
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{:ok, object} <- ActivityPub.fetch_object_from_url(object),
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{:ok, activity, object} <-
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ActivityPub.join(object, actor, false, %{url: id, metadata: %{message: note}}) do
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{:ok, activity, object}
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else
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e ->
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Logger.debug(inspect(e))
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:error
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end
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end
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def handle_incoming(
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%{"type" => "Leave", "object" => object, "actor" => actor, "id" => _id} = data
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) do
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with actor <- Utils.get_actor(data),
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{:ok, %Actor{} = actor} <- Actors.get_actor_by_url(actor),
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object <- Utils.get_url(object),
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{:ok, object} <- ActivityPub.fetch_object_from_url(object),
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{:ok, activity, object} <- ActivityPub.leave(object, actor, false) do
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{:ok, activity, object}
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else
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{:only_organizer, true} ->
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Logger.warn(
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"Actor #{inspect(actor)} tried to leave event #{inspect(object)} but it was the only organizer so we didn't detach it"
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)
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:error
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_e ->
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:error
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end
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end
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#
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# # TODO
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# # Accept
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# # Undo
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#
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# def handle_incoming(
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# %{
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# "type" => "Undo",
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# "object" => %{"type" => "Like", "object" => object_id},
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# "actor" => _actor,
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# "id" => id
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# } = data
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# ) do
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# with actor <- Utils.get_actor(data),
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# %Actor{} = actor <- ActivityPub.get_or_fetch_actor_by_url(actor),
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# {:ok, object} <- fetch_obj_helper(object_id) || fetch_obj_helper(object_id),
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# {:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do
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# {:ok, activity}
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# else
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# _e -> :error
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# end
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# end
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def handle_incoming(_) do
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Logger.info("Handing something not supported")
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{:error, :not_supported}
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end
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@doc """
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Handle incoming `Accept` activities wrapping a `Follow` activity
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"""
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def do_handle_incoming_accept_following(follow_object, %Actor{} = actor) do
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with {:follow, {:ok, %Follower{approved: false, target_actor: followed} = follow}} <-
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{:follow, get_follow(follow_object)},
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{:same_actor, true} <- {:same_actor, actor.id == followed.id},
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{:ok, %Activity{} = activity, %Follower{approved: true} = follow} <-
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ActivityPub.accept(
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:follow,
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follow,
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false
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) do
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{:ok, activity, follow}
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else
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{:follow, _} ->
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Logger.debug(
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"Tried to handle an Accept activity but it's not containing a Follow activity"
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)
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nil
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{:same_actor} ->
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{:error, "Actor who accepted the follow wasn't the target. Quite odd."}
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{:ok, %Follower{approved: true} = _follow} ->
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{:error, "Follow already accepted"}
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end
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end
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@doc """
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Handle incoming `Reject` activities wrapping a `Follow` activity
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"""
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def do_handle_incoming_reject_following(follow_object, %Actor{} = actor) do
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with {:follow, {:ok, %Follower{target_actor: followed} = follow}} <-
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{:follow, get_follow(follow_object)},
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{:same_actor, true} <- {:same_actor, actor.id == followed.id},
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{:ok, activity, _} <-
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ActivityPub.reject(:follow, follow) do
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{:ok, activity, follow}
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else
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{:follow, _err} ->
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Logger.debug(
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"Tried to handle a Reject activity but it's not containing a Follow activity"
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)
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nil
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{:same_actor} ->
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{:error, "Actor who rejected the follow wasn't the target. Quite odd."}
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{:ok, %Follower{approved: true} = _follow} ->
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{:error, "Follow already accepted"}
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end
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end
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# Handle incoming `Accept` activities wrapping a `Join` activity on an event
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defp do_handle_incoming_accept_join(join_object, %Actor{} = actor_accepting) do
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with {:join_event, {:ok, %Participant{role: role, event: event} = participant}}
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when role in [:not_approved, :rejected] <-
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{:join_event, get_participant(join_object)},
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# TODO: The actor that accepts the Join activity may another one that the event organizer ?
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# Or maybe for groups it's the group that sends the Accept activity
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{:same_actor, true} <- {:same_actor, actor_accepting.id == event.organizer_actor_id},
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{:ok, %Activity{} = activity, %Participant{role: :participant} = participant} <-
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ActivityPub.accept(
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:join,
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participant,
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false
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),
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:ok <-
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Participation.send_emails_to_local_user(participant) do
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{:ok, activity, participant}
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else
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{:join_event, {:ok, %Participant{role: :participant}}} ->
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Logger.debug(
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"Tried to handle an Accept activity on a Join activity with a event object but the participant is already validated"
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)
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nil
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{:join_event, _err} ->
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Logger.debug(
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"Tried to handle an Accept activity but it's not containing a Join activity on a event"
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)
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nil
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{:same_actor} ->
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{:error, "Actor who accepted the join wasn't the event organizer. Quite odd."}
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{:ok, %Participant{role: :participant} = _follow} ->
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{:error, "Participant"}
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end
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end
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# Handle incoming `Reject` activities wrapping a `Join` activity on an event
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defp do_handle_incoming_reject_join(join_object, %Actor{} = actor_accepting) do
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with {:join_event, {:ok, %Participant{event: event, role: role} = participant}}
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when role != :rejected <-
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{:join_event, get_participant(join_object)},
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# TODO: The actor that accepts the Join activity may another one that the event organizer ?
|
||
# Or maybe for groups it's the group that sends the Accept activity
|
||
{:same_actor, true} <- {:same_actor, actor_accepting.id == event.organizer_actor_id},
|
||
{:ok, activity, participant} <-
|
||
ActivityPub.reject(:join, participant, false),
|
||
:ok <- Participation.send_emails_to_local_user(participant) do
|
||
{:ok, activity, participant}
|
||
else
|
||
{:join_event, {:ok, %Participant{role: :rejected}}} ->
|
||
Logger.warn(
|
||
"Tried to handle an Reject activity on a Join activity with a event object but the participant is already rejected"
|
||
)
|
||
|
||
nil
|
||
|
||
{:join_event, _err} ->
|
||
Logger.debug(
|
||
"Tried to handle an Reject activity but it's not containing a Join activity on a event"
|
||
)
|
||
|
||
nil
|
||
|
||
{:same_actor} ->
|
||
{:error, "Actor who rejected the join wasn't the event organizer. Quite odd."}
|
||
|
||
{:ok, %Participant{role: :participant} = _follow} ->
|
||
{:error, "Participant"}
|
||
end
|
||
end
|
||
|
||
# TODO: Add do_handle_incoming_accept_join/1 on Groups
|
||
|
||
defp get_follow(follow_object) do
|
||
with follow_object_id when not is_nil(follow_object_id) <- Utils.get_url(follow_object),
|
||
{:not_found, %Follower{} = follow} <-
|
||
{:not_found, Actors.get_follower_by_url(follow_object_id)} do
|
||
{:ok, follow}
|
||
else
|
||
{:not_found, _err} ->
|
||
{:error, "Follow URL not found"}
|
||
|
||
_ ->
|
||
{:error, "ActivityPub ID not found in Accept Follow object"}
|
||
end
|
||
end
|
||
|
||
defp get_participant(join_object) do
|
||
with join_object_id when not is_nil(join_object_id) <- Utils.get_url(join_object),
|
||
{:not_found, %Participant{} = participant} <-
|
||
{:not_found, Events.get_participant_by_url(join_object_id)} do
|
||
{:ok, participant}
|
||
else
|
||
{:not_found, _err} ->
|
||
{:error, "Participant URL not found"}
|
||
|
||
_ ->
|
||
{:error, "ActivityPub ID not found in Accept Join object"}
|
||
end
|
||
end
|
||
|
||
def prepare_outgoing(%{"type" => _type} = data) do
|
||
data =
|
||
data
|
||
|> Map.merge(Utils.make_json_ld_header())
|
||
|
||
{:ok, data}
|
||
end
|
||
|
||
@spec fetch_obj_helper(map() | String.t()) :: Event.t() | Comment.t() | Actor.t() | any()
|
||
def fetch_obj_helper(object) do
|
||
Logger.debug("fetch_obj_helper")
|
||
Logger.debug("Fetching object #{inspect(object)}")
|
||
|
||
case object |> Utils.get_url() |> ActivityPub.fetch_object_from_url() do
|
||
{:ok, object} ->
|
||
{:ok, object}
|
||
|
||
err ->
|
||
Logger.warn("Error while fetching #{inspect(object)}")
|
||
{:error, err}
|
||
end
|
||
end
|
||
|
||
def fetch_obj_helper_as_activity_streams(object) do
|
||
Logger.debug("fetch_obj_helper_as_activity_streams")
|
||
|
||
with {:ok, object} <- fetch_obj_helper(object) do
|
||
{:ok, Convertible.model_to_as(object)}
|
||
end
|
||
end
|
||
end
|