mobilizon/lib/federation/activity_pub/transmogrifier.ex

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# Portions of this file are derived from Pleroma:
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
# SPDX-License-Identifier: AGPL-3.0-only
# 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
@moduledoc """
A module to handle coding from internal to wire ActivityPub and back.
"""
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alias Mobilizon.{Actors, Discussions, Events, Posts, Resources, Todos}
alias Mobilizon.Actors.{Actor, Follower, Member}
alias Mobilizon.Discussions.Comment
alias Mobilizon.Events.{Event, Participant}
alias Mobilizon.Posts.Post
alias Mobilizon.Resources.Resource
alias Mobilizon.Todos.{Todo, TodoList}
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alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Federation.ActivityPub.{Actions, Activity, Permission, Relay, Utils}
alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
alias Mobilizon.Federation.ActivityPub.Types.Ownable
alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
alias Mobilizon.Service.ErrorReporting.Sentry
alias Mobilizon.Service.Workers.Background
alias Mobilizon.Tombstone
alias Mobilizon.Web.Email.Participation
alias Mobilizon.Web.Endpoint
require Logger
@doc """
Handle incoming activities
"""
@spec handle_incoming(map()) :: :error | {:error, atom()} | {:ok, any(), struct()}
def handle_incoming(%{"id" => nil}), do: :error
def handle_incoming(%{"id" => ""}), do: :error
def handle_incoming(%{"type" => "Flag"} = data) do
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with params <- Converter.Flag.as_to_model(data) do
params = %{
reporter_id: params["reporter"].id,
reported_id: params["reported"].id,
comments_ids:
if(params["comments"], do: params["comments"] |> Enum.map(& &1.id), else: []),
content: params["content"] || "",
additional: %{
"cc" => [params["reported"].url]
},
event_id: if(is_nil(params["event"]), do: nil, else: params["event"].id || nil),
local: false
}
Actions.Flag.flag(params, false)
end
end
# Handles a `Create` activity for `Note` (comments) objects
#
# The following actions are performed
# * Fetch the author of the activity
# * Convert the ActivityStream data to the comment model format (it also finds and inserts tags)
# * Get (by it's URL) or create the comment with this data
# * Insert eventual mentions in the database
# * Convert the comment back in ActivityStreams data
# * Wrap this data back into a `Create` activity
# * Return the activity and the comment object
def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object}) do
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Logger.info("Handle incoming to create notes")
case Discussions.get_comment_from_url_with_preload(object["id"]) do
{:error, :comment_not_found} ->
case Converter.Comment.as_to_model_data(object) do
%{visibility: visibility, attributed_to_id: attributed_to_id} = object_data
when visibility === :private and is_nil(attributed_to_id) ->
Actions.Create.create(:conversation, object_data, false)
object_data when is_map(object_data) ->
handle_comment_or_discussion(object_data)
{:error, err} ->
{:error, err}
end
{:ok, %Comment{} = comment} ->
# Object already exists
{:ok, nil, comment}
{:error, err} ->
{:error, err}
end
end
# Handles a `Create` activity for `Event` objects
#
# The following actions are performed
# * Fetch the author of the activity
# * Convert the ActivityStream data to the event model format (it also finds and inserts tags)
# * Get (by it's URL) or create the event with this data
# * Insert eventual mentions in the database
# * Convert the event back in ActivityStreams data
# * Wrap this data back into a `Create` activity
# * Return the activity and the event object
def handle_incoming(%{"type" => "Create", "object" => %{"type" => "Event"} = object}) do
Logger.info("Handle incoming to create event")
with object_data when is_map(object_data) <-
object |> Converter.Event.as_to_model_data(),
{:existing_event, nil} <- {:existing_event, Events.get_event_by_url(object_data.url)},
{:ok, %Activity{} = activity, %Event{} = event} <-
Actions.Create.create(:event, object_data, false) do
{:ok, activity, event}
else
{:existing_event, %Event{} = event} ->
{:ok, nil, event}
err ->
Logger.debug(inspect(err))
:error
end
end
def handle_incoming(%{
"type" => "Create",
"object" => %{"type" => type, "id" => actor_url} = _object
})
when type in ["Group", "Person", "Actor"] do
Logger.info("Handle incoming to create an actor")
with {:ok, %Actor{} = actor} <- ActivityPubActor.get_or_fetch_actor_by_url(actor_url) do
{:ok, nil, actor}
end
end
def handle_incoming(%{
"type" => "Create",
"object" => %{"type" => "Member"} = object
}) do
Logger.info("Handle incoming to create a member")
with object_data when is_map(object_data) <-
object |> Converter.Member.as_to_model_data() do
Logger.debug("Produced the following model data for member")
Logger.debug(inspect(object_data))
with {:existing_member, nil} <-
{:existing_member, Actors.get_member_by_url(object_data.url)},
%Actor{type: :Group} = group <- Actors.get_actor(object_data.parent_id),
%Actor{} = actor <- Actors.get_actor(object_data.actor_id),
{:ok, %Activity{} = activity, %Member{} = member} <-
Actions.Join.join(group, actor, false, %{
url: object_data.url,
metadata: %{role: object_data.role}
}) do
{:ok, activity, member}
else
{:existing_member, %Member{} = member} ->
Logger.debug("Member already exists, updating member")
{:ok, %Member{} = member} = Actors.update_member(member, object_data)
{:ok, nil, member}
end
end
end
def handle_incoming(%{
"type" => "Create",
"object" =>
%{"type" => "Article", "actor" => _actor, "attributedTo" => _attributed_to} = object
}) do
Logger.info("Handle incoming to create articles")
with object_data when is_map(object_data) <-
object |> Converter.Post.as_to_model_data(),
{:existing_post, nil} <-
{:existing_post, Posts.get_post_by_url(object_data.url)},
{:ok, %Activity{} = activity, %Post{} = post} <-
Actions.Create.create(:post, object_data, false) do
{:ok, activity, post}
else
{:existing_post, %Post{} = post} ->
{:ok, nil, post}
end
end
# This is a hack to handle Tombstones fetched by AP
def handle_incoming(%{
"type" => "Create",
"object" => %{"type" => "Tombstone", "id" => object_url} = _object
}) do
Logger.info("Handle incoming to create a tombstone")
case ActivityPub.fetch_object_from_url(object_url, force: true) do
# We already have the tombstone, object is probably already deleted
{:ok, %Tombstone{} = tombstone} ->
{:ok, nil, tombstone}
# Hack because deleted comments
{:ok, %Comment{deleted_at: deleted_at} = comment} when not is_nil(deleted_at) ->
{:ok, nil, comment}
{:ok, entity} ->
Actions.Delete.delete(entity, Relay.get_actor(), false)
{:error, err} ->
Logger.warning("Error while fetching object from URL: #{inspect(err)}")
:error
end
end
def handle_incoming(
%{"type" => "Follow", "object" => followed, "actor" => follower, "id" => id} = _data
) do
with {:ok, %Actor{} = followed} <-
ActivityPubActor.get_or_fetch_actor_by_url(followed, preload: true),
{:ok, %Actor{} = follower} <- ActivityPubActor.get_or_fetch_actor_by_url(follower),
{:ok, activity, object} <-
Actions.Follow.follow(follower, followed, id, false) do
{:ok, activity, object}
else
{:error, :person_no_follow} ->
Logger.warning("Only group and instances can be followed")
:error
{:error, e} ->
Logger.warning("Unable to handle Follow activity #{inspect(e)}")
:error
end
end
def handle_incoming(%{
"type" => "Create",
"object" => %{"type" => "TodoList", "id" => object_url} = object,
"actor" => actor_url
}) do
Logger.info("Handle incoming to create a todo list")
with {:existing_todo_list, nil} <-
{:existing_todo_list, Todos.get_todo_list_by_url(object_url)},
{:ok, %Actor{url: actor_url}} <- ActivityPubActor.get_or_fetch_actor_by_url(actor_url),
object_data when is_map(object_data) <-
object |> Converter.TodoList.as_to_model_data(),
{:ok, %Activity{} = activity, %TodoList{} = todo_list} <-
Actions.Create.create(:todo_list, object_data, false, %{
"actor" => actor_url
}) do
{:ok, activity, todo_list}
else
{:error, :group_not_found} -> :error
{:existing_todo_list, %TodoList{} = todo_list} -> {:ok, nil, todo_list}
end
end
def handle_incoming(%{
"type" => "Create",
"object" => %{"type" => "Todo", "id" => object_url} = object
}) do
Logger.info("Handle incoming to create a todo")
with {:existing_todo, nil} <-
{:existing_todo, Todos.get_todo_by_url(object_url)},
object_data <-
object |> Converter.Todo.as_to_model_data(),
{:ok, %Activity{} = activity, %Todo{} = todo} <-
Actions.Create.create(:todo, object_data, false) do
{:ok, activity, todo}
else
{:existing_todo, %Todo{} = todo} -> {:ok, nil, todo}
end
end
def handle_incoming(
%{
"type" => activity_type,
"object" => %{"type" => object_type, "id" => object_url} = object
} = data
)
when activity_type in ["Create", "Add"] and
object_type in ["Document", "ResourceCollection"] do
Logger.info("Handle incoming to create a resource")
Logger.debug(inspect(data))
with {:existing_resource, nil} <-
{:existing_resource, Resources.get_resource_by_url(object_url)},
object_data when is_map(object_data) <-
object |> Converter.Resource.as_to_model_data(),
{:member, true} <-
{:member, Actors.member?(object_data.creator_id, object_data.actor_id)},
{:ok, %Activity{} = activity, %Resource{} = resource} <-
Actions.Create.create(:resource, object_data, false) do
{:ok, activity, resource}
else
{:existing_resource, %Resource{} = resource} ->
{:ok, nil, resource}
{:member, false} ->
# At some point this should refresh the list of group members
# if the group is not local before simply returning an error
:error
{:error, e} ->
Logger.debug(inspect(e))
:error
end
end
def handle_incoming(
%{
"type" => "Accept",
"object" => accepted_object,
"actor" => _actor,
"id" => id
} = data
) do
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with actor_url <- Utils.get_actor(data),
{:ok, %Actor{} = actor} <- ActivityPubActor.get_or_fetch_actor_by_url(actor_url),
{:object_not_found, {:ok, %Activity{} = activity, object}} <-
{:object_not_found,
do_handle_incoming_accept_following(accepted_object, actor) ||
do_handle_incoming_accept_join(accepted_object, actor)} do
{:ok, activity, object}
else
{:object_not_found, {:error, "Follow already accepted"}} ->
Logger.info("Follow was already accepted. Ignoring.")
:error
{:object_not_found, nil} ->
Logger.warning(
"Unable to process Accept activity #{inspect(id)}. Object #{inspect(accepted_object)} wasn't found."
)
:error
e ->
Logger.warning(
"Unable to process Accept activity #{inspect(id)} for object #{inspect(accepted_object)} only returned #{inspect(e)}"
)
:error
end
end
def handle_incoming(
%{"type" => "Reject", "object" => rejected_object, "actor" => _actor, "id" => id} = data
) do
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with actor_url <- Utils.get_actor(data),
{:ok, %Actor{} = actor} <- ActivityPubActor.get_or_fetch_actor_by_url(actor_url),
{:object_not_found, {:ok, activity, object}} <-
{:object_not_found,
do_handle_incoming_reject_following(rejected_object, actor) ||
do_handle_incoming_reject_join(rejected_object, actor) ||
do_handle_incoming_reject_invite(rejected_object, actor)} do
{:ok, activity, object}
else
{:object_not_found, nil} ->
Logger.warning(
"Unable to process Reject activity #{inspect(id)}. Object #{inspect(rejected_object)} wasn't found."
)
:error
e ->
Logger.warning(
"Unable to process Reject activity #{inspect(id)} for object #{inspect(rejected_object)} only returned #{inspect(e)}"
)
:error
end
end
def handle_incoming(
%{"type" => "Announce", "object" => object, "actor" => _actor, "id" => _id} = data
) do
with actor_url <- Utils.get_actor(data),
{:ok, %Actor{id: actor_id, suspended: false} = actor} <-
ActivityPubActor.get_or_fetch_actor_by_url(actor_url),
:ok <- Logger.debug("Fetching contained object"),
{:ok, entity} <- process_announce_data(object, actor),
:ok <- eventually_create_share(object, entity, actor_id) do
{:ok, nil, entity}
else
e ->
Logger.debug(inspect(e))
:error
end
end
def handle_incoming(
%{
"type" => "Update",
"object" => %{"type" => object_type} = object,
"actor" => _actor_id
} = params
)
when object_type in ["Person", "Group", "Application", "Service", "Organization"] do
with author_url <- Utils.get_actor(params),
{:ok, %Actor{suspended: false} = author} <-
ActivityPubActor.get_or_fetch_actor_by_url(author_url),
{:ok, %Actor{suspended: false} = old_actor} <-
ActivityPubActor.get_or_fetch_actor_by_url(object["id"]),
object_data <-
object |> Converter.Actor.as_to_model_data(),
{:ok, %Activity{} = activity, %Actor{} = new_actor} <-
Actions.Update.update(old_actor, object_data, false, %{updater_actor: author}) do
{:ok, activity, new_actor}
else
{:error, :update_not_allowed} ->
Logger.warning(
"Activity tried to update an actor that's local or not a group: #{inspect(params)}"
)
:error
e ->
Sentry.capture_message("Error while handling an Update activity",
extra: %{params: params}
)
Logger.debug(inspect(e))
:error
end
end
def handle_incoming(
%{"type" => "Update", "object" => %{"type" => "Event"} = object, "actor" => _actor} =
update_data
) do
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with actor <- Utils.get_actor(update_data),
{:ok, %Actor{url: actor_url, suspended: false} = actor} <-
ActivityPubActor.get_or_fetch_actor_by_url(actor),
{:ok, %Event{} = old_event} <-
object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
object_data <- Converter.Event.as_to_model_data(object),
{:origin_check, true} <-
{:origin_check,
Utils.origin_check?(actor_url, update_data) ||
Permission.can_update_group_object?(actor, old_event)},
{:ok, %Activity{} = activity, %Event{} = new_event} <-
Actions.Update.update(old_event, object_data, false) do
{:ok, activity, new_event}
else
_e ->
:error
end
end
def handle_incoming(
%{"type" => "Update", "object" => %{"type" => "Note"} = object, "actor" => _actor} =
update_data
) do
Logger.info("Handle incoming to update a note")
with actor <- Utils.get_actor(update_data),
{:ok, %Actor{url: actor_url, suspended: false}} <-
ActivityPubActor.get_or_fetch_actor_by_url(actor),
{:origin_check, true} <- {:origin_check, Utils.origin_check?(actor_url, update_data)},
object_data <- Converter.Comment.as_to_model_data(object),
{:ok, old_entity} <- object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
object_data <- transform_object_data_for_discussion(object_data),
{:ok, %Activity{} = activity, new_entity} <-
Actions.Update.update(old_entity, object_data, false) do
{:ok, activity, new_entity}
else
_e ->
:error
end
end
def handle_incoming(
%{"type" => "Update", "object" => %{"type" => "Article"} = object, "actor" => _actor} =
update_data
) do
with actor <- Utils.get_actor(update_data),
{:ok, %Actor{url: actor_url, suspended: false} = actor} <-
ActivityPubActor.get_or_fetch_actor_by_url(actor),
{:ok, %Post{} = old_post} <-
object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
object_data <- Converter.Post.as_to_model_data(object),
{:origin_check, true} <-
{:origin_check,
Utils.origin_check?(actor_url, update_data["object"]) ||
Permission.can_update_group_object?(actor, old_post)},
{:ok, %Activity{} = activity, %Post{} = new_post} <-
Actions.Update.update(old_post, object_data, false) do
{:ok, activity, new_post}
else
{:origin_check, _} ->
Logger.warning("Actor tried to update a post but doesn't has the required role")
:error
_e ->
:error
end
end
def handle_incoming(
%{"type" => "Update", "object" => %{"type" => type} = object, "actor" => _actor} =
update_data
)
when type in ["ResourceCollection", "Document"] do
with actor <- Utils.get_actor(update_data),
{:ok, %Actor{url: actor_url, suspended: false}} <-
ActivityPubActor.get_or_fetch_actor_by_url(actor),
{:ok, %Resource{} = old_resource} <-
object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
object_data <- Converter.Resource.as_to_model_data(object),
{:origin_check, true} <-
{:origin_check,
Utils.origin_check?(actor_url, update_data) ||
Permission.can_update_group_object?(actor, old_resource)},
{:ok, %Activity{} = activity, %Resource{} = new_resource} <-
Actions.Update.update(old_resource, object_data, false) do
{:ok, activity, new_resource}
else
_e ->
:error
end
end
def handle_incoming(
%{"type" => "Update", "object" => %{"type" => "Member"} = object, "actor" => _actor} =
update_data
) do
Logger.info("Handle incoming to update a member")
with actor <- Utils.get_actor(update_data),
{:ok, %Actor{url: actor_url, suspended: false} = actor} <-
ActivityPubActor.get_or_fetch_actor_by_url(actor),
{:origin_check, true} <- {:origin_check, Utils.origin_check?(actor_url, update_data)},
object_data <- Converter.Member.as_to_model_data(object),
{:ok, old_entity} <- object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
{:ok, %Activity{} = activity, new_entity} <-
Actions.Update.update(old_entity, object_data, false, %{moderator: actor}) do
{:ok, activity, new_entity}
else
_e ->
:error
end
end
def handle_incoming(%{
"type" => "Update",
"object" => %{"type" => "Tombstone"} = object,
"actor" => _actor
}) do
Logger.info("Handle incoming to update a tombstone")
with object_url <- Utils.get_url(object),
{:ok, entity} <- ActivityPub.fetch_object_from_url(object_url) do
Actions.Delete.delete(entity, Relay.get_actor(), false)
else
{:ok, %Tombstone{} = tombstone} ->
{:ok, nil, tombstone}
end
end
def handle_incoming(
%{
"type" => "Undo",
"object" => %{
"type" => "Announce",
"object" => object_id,
"id" => cancelled_activity_id
},
"actor" => _actor,
"id" => id
} = data
) do
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with actor <- Utils.get_actor(data),
{:ok, %Actor{} = actor} <- ActivityPubActor.get_or_fetch_actor_by_url(actor),
{:ok, object} <- fetch_obj_helper_as_activity_streams(object_id),
{:ok, activity, object} <-
Actions.Announce.unannounce(
actor,
object,
id,
cancelled_activity_id,
false
) do
{:ok, activity, object}
else
_e -> :error
end
end
def handle_incoming(
%{
"type" => "Undo",
"object" => %{"type" => "Follow", "object" => followed},
"actor" => follower,
"id" => id
} = _data
) do
with {:ok, %Actor{domain: nil} = followed} <-
ActivityPubActor.get_or_fetch_actor_by_url(followed),
{:ok, %Actor{} = follower} <- ActivityPubActor.get_or_fetch_actor_by_url(follower),
{:ok, activity, object} <-
Actions.Follow.unfollow(follower, followed, id, false) do
{:ok, activity, object}
else
e ->
Logger.debug(inspect(e))
:error
end
end
# We assume everyone on the same instance as the object
# or who is member of a group has the right to delete the object
def handle_incoming(
%{"type" => "Delete", "object" => object, "actor" => _actor, "id" => _id} = data
) do
Logger.info("Handle incoming to delete an object")
actor_url = Utils.get_actor(data)
object_id = Utils.get_url(object)
case ActivityPubActor.get_or_fetch_actor_by_url(actor_url) do
{:error, _err} ->
{:error, :unknown_actor}
{:ok, %Actor{} = actor} ->
# If the actor itself is being deleted, no need to check anything other than the object being remote
if remote_actor_is_being_deleted(data) do
Actions.Delete.delete(actor, actor, false)
else
handle_group_being_gone(actor, actor_url, object_id)
end
end
end
def handle_incoming(
%{"type" => "Move", "object" => %{"type" => type} = object, "actor" => _actor} = data
)
when type in ["ResourceCollection", "Document"] do
with actor <- Utils.get_actor(data),
{:ok, %Actor{url: actor_url, suspended: false} = actor} <-
ActivityPubActor.get_or_fetch_actor_by_url(actor),
{:ok, %Resource{} = old_resource} <-
object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
object_data <- Converter.Resource.as_to_model_data(object),
{:origin_check, true} <-
{:origin_check,
Utils.origin_check?(actor_url, data) ||
Permission.can_update_group_object?(actor, old_resource)},
{:ok, activity, new_resource} <-
Actions.Move.move(:resource, old_resource, object_data) do
{:ok, activity, new_resource}
else
e ->
Logger.debug(inspect(e))
Sentry.capture_message("Error while handling an Move activity",
extra: %{data: data}
)
:error
end
end
def handle_incoming(
%{
"type" => "Join",
"object" => object,
"actor" => _actor,
"id" => id
} = data
) do
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with actor <- Utils.get_actor(data),
{:ok, %Actor{url: _actor_url, suspended: false} = actor} <-
ActivityPubActor.get_or_fetch_actor_by_url(actor),
object <- Utils.get_url(object),
{:ok, object} <- ActivityPub.fetch_object_from_url(object),
{:ok, activity, object} <-
Actions.Join.join(object, actor, false, %{
url: id,
metadata: %{message: Map.get(data, "participationMessage")}
}) do
{:ok, activity, object}
else
e ->
Logger.debug(inspect(e))
:error
end
end
def handle_incoming(%{"type" => "Leave", "object" => object, "actor" => actor} = data) do
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with actor <- Utils.get_actor(data),
{:ok, %Actor{} = actor} <- ActivityPubActor.get_or_fetch_actor_by_url(actor),
object <- Utils.get_url(object),
{:ok, object} <- ActivityPub.fetch_object_from_url(object),
{:ok, activity, object} <- Actions.Leave.leave(object, actor, false) do
{:ok, activity, object}
else
{:only_organizer, true} ->
Logger.warning(
"Actor #{inspect(actor)} tried to leave event #{inspect(object)} but it was the only organizer so we didn't detach it"
)
:error
_e ->
:error
end
end
def handle_incoming(
%{
"type" => "Invite",
"object" => object,
"actor" => _actor,
"id" => id,
"target" => target
} = data
) do
Logger.info("Handle incoming to invite someone")
with {:ok, %Actor{} = actor} <-
data |> Utils.get_actor() |> ActivityPubActor.get_or_fetch_actor_by_url(),
{:ok, object} <- object |> Utils.get_url() |> ActivityPub.fetch_object_from_url(),
{:ok, %Actor{} = target} <-
target |> Utils.get_url() |> ActivityPubActor.get_or_fetch_actor_by_url(),
{:ok, activity, %Member{} = member} <-
Actions.Invite.invite(object, actor, target, false, %{url: id}) do
{:ok, activity, member}
end
end
def handle_incoming(
%{"type" => "Remove", "actor" => actor, "object" => object, "origin" => origin} = data
) do
Logger.info("Handle incoming to remove a member from a group")
with {:ok, %Actor{} = moderator} <-
data |> Utils.get_actor() |> ActivityPubActor.get_or_fetch_actor_by_url(),
{:ok, person_id} <- get_remove_object(object),
{:ok, %Actor{type: :Group, id: group_id} = group} <-
origin |> Utils.get_url() |> ActivityPubActor.get_or_fetch_actor_by_url(),
{:is_admin, true} <-
{:is_admin, can_remove_actor_from_group?(moderator, group)},
{:is_member, {:ok, %Member{role: role} = member}} when role != :rejected <-
{:is_member, Actors.get_member(person_id, group_id)} do
Actions.Remove.remove(member, group, moderator, false)
else
{:is_admin, {:ok, %Member{}}} ->
Logger.warning(
"Person #{inspect(actor)} is not an admin from #{inspect(origin)} and can't remove member #{inspect(object)}"
)
{:error, "Member already removed"}
{:is_member, {:ok, %Member{role: :rejected}}} ->
Logger.warning("Member #{inspect(object)} already removed from #{inspect(origin)}")
{:error, "Member already removed"}
end
end
#
# # TODO
# # Accept
# # Undo
#
# def handle_incoming(
# %{
# "type" => "Undo",
# "object" => %{"type" => "Like", "object" => object_id},
# "actor" => _actor,
# "id" => id
# } = data
# ) do
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# with actor <- Utils.get_actor(data),
# %Actor{} = actor <- ActivityPub.get_or_fetch_actor_by_url(actor),
# {:ok, object} <- fetch_obj_helper(object_id) || fetch_obj_helper(object_id),
# {:ok, activity, _, _} <- ActivityPub.unlike(actor, object, id, false) do
# {:ok, activity}
# else
# _e -> :error
# end
# end
def handle_incoming(object) do
Logger.info("Handing something with type #{object["type"]} not supported")
Logger.debug(inspect(object))
{:error, :not_supported}
end
# Handle incoming `Accept` activities wrapping a `Follow` activity
defp do_handle_incoming_accept_following(follow_object, %Actor{} = actor) do
with {:follow,
{:ok, %Follower{approved: false, target_actor: followed, actor: follower} = follow}} <-
{:follow, get_follow(follow_object)},
{:same_actor, true} <- {:same_actor, actor.id == followed.id},
{:ok, %Activity{} = activity, %Follower{approved: true} = follow} <-
Actions.Accept.accept(
:follow,
follow,
false
) do
relay_actor = Relay.get_actor()
# If this is an instance follow, refresh the followed profile (especially their outbox)
if follower.id == relay_actor.id do
Background.enqueue("refresh_profile", %{
"actor_id" => followed.id
})
end
{:ok, activity, follow}
else
{:follow, {:ok, %Follower{approved: true} = _follow}} ->
Logger.debug("Follow already accepted")
{:error, "Follow already accepted"}
{:follow, _} ->
Logger.debug(
"Tried to handle an Accept activity but it's not containing a Follow activity"
)
nil
{:same_actor} ->
{:error, "Actor who accepted the follow wasn't the target. Quite odd."}
end
end
# Handle incoming `Reject` activities wrapping a `Follow` activity
defp do_handle_incoming_reject_following(follow_object, %Actor{} = actor) do
with {:follow, {:ok, %Follower{target_actor: followed} = follow}} <-
{:follow, get_follow(follow_object)},
{:same_actor, true} <- {:same_actor, actor.id == followed.id},
{:ok, activity, _} <-
Actions.Reject.reject(:follow, follow) do
{:ok, activity, follow}
else
{:follow, _err} ->
Logger.debug(
"Tried to handle a Reject activity but it's not containing a Follow activity"
)
nil
{:same_actor} ->
{:error, "Actor who rejected the follow wasn't the target. Quite odd."}
{:ok, %Follower{approved: true} = _follow} ->
{:error, "Follow already accepted"}
end
end
# Handle incoming `Accept` activities wrapping a `Join` activity on an event
defp do_handle_incoming_accept_join(join_object, %Actor{} = actor_accepting) do
case get_participant(join_object, actor_accepting) do
{:ok, activity, participant} ->
do_handle_incoming_accept_join_event(participant, actor_accepting, activity)
{:error, _err} ->
case get_member(join_object) do
{:ok, %Member{role: :not_approved} = member} ->
do_handle_incoming_accept_join_group(member, :member, %{moderator: actor_accepting})
{:ok, %Member{invited_by: nil} = member} ->
do_handle_incoming_accept_join_group(member, :join)
{:ok, %Member{} = member} ->
do_handle_incoming_accept_join_group(member, :invite)
{:error, _err} ->
nil
end
end
end
defp do_handle_incoming_accept_join_event(
%Participant{role: :participant} = participant,
_actor,
activity
) do
Logger.debug(
"Tried to handle an Accept activity on a Join activity with a event object but the participant is already validated"
)
{:ok, activity, participant}
end
defp do_handle_incoming_accept_join_event(
%Participant{role: role, event: event} = participant,
%Actor{} = actor_accepting,
_activity
)
when role in [:not_approved, :rejected] do
with %Event{} = event <- Events.get_event_with_preload!(event.id),
{:can_accept_event_join, true} <-
{:can_accept_event_join, can_manage_event?(actor_accepting, event)},
{:ok, %Activity{} = activity, %Participant{role: :participant} = participant} <-
Actions.Accept.accept(
:join,
participant,
false
),
:ok <-
Participation.send_emails_to_local_user(participant) do
{:ok, activity, participant}
else
{:can_accept_event_join, false} ->
{:error, "Actor who accepted the join didn't have permission to do so."}
{:ok, %Participant{role: :participant} = _follow} ->
{:error, "Participant"}
end
end
defp do_handle_incoming_accept_join_group(%Member{role: :member}, _type) do
Logger.debug(
"Tried to handle an Accept activity on a Join activity with a group object but the member is already validated"
)
nil
end
defp do_handle_incoming_accept_join_group(
%Member{role: role, parent: _group} = member,
type,
additional \\ %{}
)
when role in [:not_approved, :rejected, :invited] and type in [:join, :invite, :member] do
# Or maybe for groups it's the group that sends the Accept activity
with {:ok, %Activity{} = activity, %Member{role: :member} = member} <-
Actions.Accept.accept(
type,
member,
false,
additional
) do
{:ok, activity, member}
end
end
# Handle incoming `Reject` activities wrapping a `Join` activity on an event
defp do_handle_incoming_reject_join(join_object, %Actor{} = actor_accepting) do
with {:join_event, {:ok, _activity, %Participant{event: event, role: role} = participant}}
when role != :rejected <-
{:join_event, get_participant(join_object, actor_accepting)},
{:event, %Event{} = event} <- {:event, Events.get_event_with_preload!(event.id)},
{:can_accept_event_reject, true} <-
{:can_accept_event_reject, can_manage_event?(actor_accepting, event)},
{:ok, activity, participant} <-
Actions.Reject.reject(:join, participant, false),
:ok <- Participation.send_emails_to_local_user(participant) do
{:ok, activity, participant}
else
{:join_event, {:ok, _activity, %Participant{role: :rejected}}} ->
Logger.warning(
"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
defp do_handle_incoming_reject_invite(invite_object, %Actor{} = actor_rejecting) do
with {:invite, {:ok, %Member{role: :invited, actor_id: actor_id} = member}} <-
{:invite, get_member(invite_object)},
{:same_actor, true} <- {:same_actor, actor_rejecting.id == actor_id} do
Actions.Reject.reject(:invite, member, false)
end
end
# If the object has been announced by a group let's use one of our members to fetch it
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@spec fetch_object_optionally_authenticated(String.t(), Actor.t() | any()) ::
{:ok, struct()} | {:error, any()}
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defp fetch_object_optionally_authenticated(url, %Actor{type: :Group, id: group_id}) do
case Actors.get_single_group_member_actor(group_id) do
%Actor{} = actor ->
ActivityPub.fetch_object_from_url(url, on_behalf_of: actor, force: true)
_err ->
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fetch_object_optionally_authenticated(url, nil)
end
end
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defp fetch_object_optionally_authenticated(url, _),
do: ActivityPub.fetch_object_from_url(url, force: true)
defp eventually_create_share(object, entity, actor_id) do
with object_id <- object |> Utils.get_url(),
%Actor{id: object_owner_actor_id} <- Ownable.actor(entity) do
{:ok, %Mobilizon.Share{} = _share} =
Mobilizon.Share.create(object_id, actor_id, object_owner_actor_id)
end
:ok
end
# Comment initiates a whole discussion only if it has full title
@spec data_for_comment_or_discussion?(map()) :: boolean()
defp data_for_comment_or_discussion?(object_data) do
data_a_discussion_initialization?(object_data) and
is_nil(object_data.discussion_id)
end
# Comment initiates a whole discussion only if it has full title
defp data_a_discussion_initialization?(object_data) do
not Map.has_key?(object_data, :title) or
is_nil(object_data.title) or object_data.title == ""
end
defp handle_comment_or_discussion(object_data) do
case Discussions.get_comment_from_url_with_preload(object_data.url) do
{:error, :comment_not_found} ->
object_data
|> transform_object_data_for_discussion()
|> save_comment_or_discussion()
{:ok, %Comment{} = comment} ->
# Object already exists
{:ok, nil, comment}
end
end
# Comment and conversations have different attributes for actor and groups
@spec transform_object_data_for_discussion(map()) :: map()
defp transform_object_data_for_discussion(object_data) do
# Basic comment
if data_a_discussion_initialization?(object_data) do
object_data
else
# Conversation
object_data
|> Map.put(:creator_id, object_data.actor_id)
|> Map.put(:actor_id, object_data.attributed_to_id || object_data.actor_id)
end
end
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} <-
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{: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, %Actor{} = actor_accepting, loop \\ 1, activity \\ nil) 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, activity, participant}
else
{:not_found, _err} ->
with true <- is_map(join_object),
true <- loop < 2,
true <- Utils.are_same_origin?(actor_accepting.url, join_object["id"]),
{:ok, activity, %Participant{url: participant_url}} <- handle_incoming(join_object) do
get_participant(participant_url, actor_accepting, 2, activity)
else
_ ->
{:error, "Participant URL not found"}
end
_ ->
{:error, "ActivityPub ID not found in Accept Join object"}
end
end
@spec get_member(String.t() | map()) :: {:ok, Member.t()} | {:error, String.t()}
defp get_member(member_object) do
with member_object_id when not is_nil(member_object_id) <- Utils.get_url(member_object),
%Member{} = member <-
Actors.get_member_by_url(member_object_id) do
{:ok, member}
else
{:error, :member_not_found} ->
{:error, "Member 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.warning("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
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{:ok, Convertible.model_to_as(object)}
end
end
# Otherwise we need to fetch what's at the URL (this is possible only for objects, not activities)
defp process_announce_data(%{"id" => url}, %Actor{} = actor),
do: process_announce_data(url, actor)
defp process_announce_data(url, %Actor{} = actor) do
if Utils.are_same_origin?(url, Endpoint.url()) do
ActivityPub.fetch_object_from_url(url, force: false)
else
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fetch_object_optionally_authenticated(url, actor)
end
end
defp group_object_gone_check(object_id) do
Logger.debug("Checking if group object #{object_id} is gone")
case ActivityPub.fetch_object_from_url(object_id, force: true) do
# comments are just emptied
{:ok, %Comment{deleted_at: deleted_at} = object} when not is_nil(deleted_at) ->
{:ok, object}
{:error, :http_gone, object} ->
Logger.debug("object is really gone")
{:ok, object}
{:ok, %{url: url} = object} ->
if Utils.are_same_origin?(url, Endpoint.url()),
do: {:ok, object},
else: {:error, "Group object URL remote"}
{:error, err} ->
{:error, err}
err ->
err
end
end
@spec get_remove_object(map() | String.t()) :: {:ok, integer()}
defp get_remove_object(object) do
case object |> Utils.get_url() |> ActivityPub.fetch_object_from_url() do
{:ok, %Member{actor: %Actor{id: person_id}}} -> {:ok, person_id}
_ -> {:error, :remove_object_not_found}
end
end
defp can_manage_event?(
%Actor{url: actor_url} = actor,
%Event{attributed_to: %Actor{type: :Group, url: group_url} = _group} = event
) do
actor_url == group_url || Permission.can_update_group_object?(actor, event)
end
defp can_manage_event?(
%Actor{id: actor_id},
%Event{organizer_actor: %Actor{id: organizer_actor_id}}
) do
organizer_actor_id == actor_id
end
defp can_manage_event?(%Actor{} = _actor, %Event{} = _event) do
false
end
@spec create_comment_or_discussion(map()) ::
{:ok, Activity.t(), struct()} | {:error, atom() | Ecto.Changeset.t()}
defp create_comment_or_discussion(object_data) do
if data_for_comment_or_discussion?(object_data) do
Logger.debug("Chosing to create a regular comment")
Actions.Create.create(:comment, object_data, false)
else
Logger.debug("Chosing to initialize or add a comment to a conversation")
Actions.Create.create(:discussion, object_data, false)
end
end
@spec can_remove_actor_from_group?(Actor.t(), Actor.t()) :: boolean()
defp can_remove_actor_from_group?(%Actor{} = moderator, %Actor{} = group) do
case Actors.get_member(moderator.id, group.id) do
{:ok, %Member{role: role}} when role in [:moderator, :administrator, :creator] ->
true
_ ->
# If member moderator not found, it's probably because no one on this instance is member of this group yet
# Therefore we can't access the list of admin/moderators and we just trust the origin domain
moderator.domain == group.domain
end
end
defp remote_actor_is_being_deleted(%{"object" => object} = data) do
object_id = Utils.get_url(object)
Utils.get_actor(data) == object_id and not Utils.are_same_origin?(object_id, Endpoint.url())
end
@spec save_comment_or_discussion(map()) :: {:ok, Activity.t(), struct()} | :error
defp save_comment_or_discussion(object_data) do
case create_comment_or_discussion(object_data) do
{:ok, %Activity{} = activity, entity} ->
{:ok, activity, entity}
{:error, :entity_tombstoned} ->
Logger.debug("Tried to reply to an event that has been tombstoned")
:error
{:error, :event_not_allow_commenting} ->
Logger.debug("Tried to reply to an event for which comments are closed")
:error
{:error, %Ecto.Changeset{} = _changeset} ->
Logger.debug("Error when saving external comment")
:error
{:error, err} ->
Logger.debug("Generic error when saving external comment: #{inspect(err)}")
:error
end
end
defp handle_group_being_gone(actor, actor_url, object_id) do
case group_object_gone_check(object_id) do
# The group object is no longer there, we can remove the element
{:ok, entity} ->
if Utils.origin_check_from_id?(actor_url, object_id) ||
Permission.can_delete_group_object?(actor, entity) do
Actions.Delete.delete(entity, actor, false)
else
Logger.warning("Object origin check failed")
:error
end
{:error, err} ->
Logger.debug(inspect(err))
{:error, err}
{:error, :http_not_found, err} ->
Logger.debug(inspect(err))
{:error, err}
end
end
end