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mobilizon/lib/service/export/common.ex

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defmodule Mobilizon.Service.Export.Common do
@moduledoc """
Common tools for exportation
"""
alias Mobilizon.{Actors, Events, Posts, Users}
alias Mobilizon.Actors.Actor
alias Mobilizon.Events.{Event, FeedToken}
alias Mobilizon.Posts.Post
alias Mobilizon.Storage.Page
alias Mobilizon.Users.User
@spec fetch_actor_event_feed(String.t(), integer()) ::
{:ok, Actor.t(), [Event.t()], [Post.t()]}
| {:error, :actor_not_public | :actor_not_found}
def fetch_actor_event_feed(name, limit) do
case Actors.get_actor_by_name(name) do
%Actor{} = actor ->
if Actor.public_visibility?(actor) do
%Page{elements: events} = Events.list_public_upcoming_events_for_actor(actor, 1, limit)
%Page{elements: posts} = Posts.get_public_posts_for_group(actor, 1, limit)
{:ok, actor, events, posts}
else
{:error, :actor_not_public}
end
nil ->
{:error, :actor_not_found}
end
end
@typep token_feed_data :: %{
type: :actor | :user,
actor: Actor.t() | nil,
user: User.t(),
events: [Event.t()],
token: String.t()
}
# Only events, not posts
@spec fetch_events_from_token(String.t(), integer()) ::
token_feed_data | {:error, :bad_token | :token_not_found}
def fetch_events_from_token(token, limit) do
case uuid_from_token(token) do
{:ok, uuid} ->
case Events.get_feed_token(uuid) do
nil ->
{:error, :token_not_found}
%FeedToken{actor: actor, user: %User{} = user} ->
produce_actor_feed(actor, user, token, limit)
end
{:error, :bad_token} ->
{:error, :bad_token}
end
end
@spec uuid_from_token(String.t()) :: {:ok, String.t()} | {:error, :bad_token}
defp uuid_from_token(token) do
case ShortUUID.decode(token) do
{:ok, uuid} ->
case Ecto.UUID.cast(uuid) do
{:ok, _uuid} ->
{:ok, uuid}
:error ->
{:error, :bad_token}
end
{:error, _err} ->
{:error, :bad_token}
end
end
@spec produce_actor_feed(Actor.t() | nil, User.t(), String.t(), integer()) :: token_feed_data
defp produce_actor_feed(%Actor{} = actor, %User{} = user, token, limit) do
%{
type: :actor,
actor: actor,
events: fetch_actor_private_events(actor, limit),
user: user,
token: token
}
end
defp produce_actor_feed(nil, %User{} = user, token, limit) do
with actors <- Users.get_actors_for_user(user),
events <-
actors
|> Enum.map(&fetch_actor_private_events(&1, limit))
|> Enum.concat() do
%{type: :user, events: events, user: user, token: token, actor: nil}
end
end
@spec fetch_instance_public_content(integer()) :: {:ok, list(Event.t()), list(Post.t())}
def fetch_instance_public_content(limit) do
%Page{elements: events} = Events.list_public_local_events(1, limit, :begins_on, :desc)
%Page{elements: posts} = Posts.list_public_local_posts(1, limit, :publish_at, :desc)
{:ok, events, posts}
end
@spec fetch_actor_private_events(Actor.t(), integer()) :: list(Event.t())
defp fetch_actor_private_events(%Actor{} = actor, limit) do
actor |> fetch_identity_participations(limit) |> participations_to_events()
end
@spec fetch_identity_participations(Actor.t(), integer()) :: Page.t(Participant.t())
defp fetch_identity_participations(%Actor{} = actor, limit) do
with %Page{} = page <- Events.list_upcoming_event_participations_for_actor(actor, 1, limit) do
page
end
end
defp participations_to_events(%Page{elements: participations}) do
participations
|> Enum.map(& &1.event_id)
|> Enum.map(&Events.get_event_with_preload!/1)
end
end