mobilizon/lib/web/views/activity_pub/actor_view.ex

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2020-01-26 20:36:50 +00:00
defmodule Mobilizon.Web.ActivityPub.ActorView do
use Mobilizon.Web, :view
alias Mobilizon.{Actors, Discussions, Events, Posts, Resources, Todos}
alias Mobilizon.Actors.{Actor, Member}
alias Mobilizon.Discussions.Discussion
alias Mobilizon.Events.Event
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alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Federation.ActivityPub.{Activity, Utils}
alias Mobilizon.Federation.ActivityStream.Convertible
alias Mobilizon.Posts.Post
alias Mobilizon.Resources.Resource
alias Mobilizon.Storage.Page
alias Mobilizon.Todos.TodoList
@private_visibility_empty_collection %{elements: [], total: 0}
@json_ld_header Utils.make_json_ld_header()
@selected_member_roles ~w(creator administrator moderator member)a
def render("actor.json", %{actor: actor}) do
actor
|> Convertible.model_to_as()
|> Map.merge(Utils.make_json_ld_header())
end
def render("member.json", %{member: %Member{} = member}) do
member
|> Convertible.model_to_as()
|> Map.merge(Utils.make_json_ld_header())
end
@doc """
Render an actor collection
"""
@spec render(String.t(), map()) :: map()
def render(view_name, %{actor: %Actor{} = actor} = args) do
is_root? = is_nil(Map.get(args, :page))
page = Map.get(args, :page, 1)
collection_name = String.trim_trailing(view_name, ".json")
collection_name = String.to_existing_atom(collection_name)
%{total: total, elements: elements} =
if can_get_collection?(collection_name, actor, Map.get(args, :actor_applicant)),
do: fetch_collection(collection_name, actor, page),
else: default_collection(collection_name, actor, page)
collection =
if is_root? do
root_collection(elements, actor, collection_name, total)
else
collection(elements, actor.preferred_username, collection_name, page, total)
end
Map.merge(collection, @json_ld_header)
end
@spec root_collection(Enum.t(), Actor.t(), atom(), integer()) :: map()
defp root_collection(
elements,
%Actor{preferred_username: preferred_username, url: actor_url},
collection,
total
) do
%{
"id" => Actor.build_url(preferred_username, collection),
"attributedTo" => actor_url,
"type" => "OrderedCollection",
"totalItems" => total,
"first" => collection(elements, preferred_username, collection, 1, total)
}
end
@spec fetch_collection(atom(), Actor.t(), integer()) :: Page.t()
defp fetch_collection(:following, actor, page) do
Actors.build_followings_for_actor(actor, page)
end
defp fetch_collection(:followers, actor, page) do
Actors.build_followers_for_actor(actor, page)
end
defp fetch_collection(:members, actor, page) do
Actors.list_members_for_group(actor, @selected_member_roles, page)
end
defp fetch_collection(:resources, actor, page) do
Resources.get_resources_for_group(actor, page)
end
defp fetch_collection(:discussions, actor, page) do
Discussions.find_discussions_for_actor(actor, page)
end
defp fetch_collection(:posts, actor, page) do
Posts.get_posts_for_group(actor, page)
end
defp fetch_collection(:events, actor, page) do
Events.list_simple_organized_events_for_group(actor, page)
end
defp fetch_collection(:todos, actor, page) do
Todos.get_todo_lists_for_group(actor, page)
end
@spec fetch_collection(atom(), Actor.t(), integer()) :: %{total: integer(), elements: Enum.t()}
defp fetch_collection(:outbox, actor, page) do
ActivityPub.fetch_public_activities_for_actor(actor, page)
end
defp fetch_collection(_, _, _), do: @private_visibility_empty_collection
@spec can_get_collection?(atom(), Actor.t(), Actor.t()) :: boolean()
# Outbox only contains public activities
defp can_get_collection?(collection, %Actor{visibility: visibility} = _actor, _actor_applicant)
when visibility in [:public, :unlisted] and collection in [:outbox, :followers, :following],
do: true
defp can_get_collection?(_collection_name, %Actor{} = actor, %Actor{} = actor_applicant),
do: actor_applicant_group_member?(actor, actor_applicant)
defp can_get_collection?(_, _, _), do: false
# Posts and events allows to browse public content
defp default_collection(:posts, %Actor{} = actor, page),
do: Posts.get_public_posts_for_group(actor, page)
defp default_collection(:events, %Actor{} = actor, page),
do: Events.list_public_events_for_actor(actor, page)
defp default_collection(_, _, _), do: @private_visibility_empty_collection
@spec collection(list(), String.t(), atom(), integer(), integer()) :: map()
defp collection(collection, preferred_username, endpoint, page, total)
when endpoint in [
:followers,
:following,
:outbox,
:members,
:resources,
:todos,
:posts,
:events,
:discussions
] do
offset = (page - 1) * 10
map = %{
"id" => Actor.build_url(preferred_username, endpoint, page: page),
"attributedTo" => Actor.build_url(preferred_username, :page),
"type" => "OrderedCollectionPage",
"partOf" => Actor.build_url(preferred_username, endpoint),
"orderedItems" => Enum.map(collection, &item/1)
}
if offset < total do
Map.put(map, "next", Actor.build_url(preferred_username, endpoint, page: page + 1))
end
map
end
def item(%Activity{data: data}), do: data
def item(%Actor{url: url}), do: url
def item(%Member{} = member), do: Convertible.model_to_as(member)
def item(%Resource{} = resource), do: Convertible.model_to_as(resource)
def item(%Discussion{} = discussion), do: Convertible.model_to_as(discussion)
def item(%Post{} = post), do: Convertible.model_to_as(post)
def item(%Event{} = event), do: Convertible.model_to_as(event)
def item(%TodoList{} = todo_list), do: Convertible.model_to_as(todo_list)
defp actor_applicant_group_member?(%Actor{}, nil), do: false
defp actor_applicant_group_member?(%Actor{id: group_id}, %Actor{id: actor_applicant_id}),
do:
Actors.get_member(actor_applicant_id, group_id, [
:member,
:moderator,
:administrator,
:creator
]) != {:error, :member_not_found}
end