defmodule Mobilizon.Service.Export.ICalendar do @moduledoc """ Export an event to iCalendar format. """ alias Mobilizon.{Actors, Events, Users} alias Mobilizon.Actors.Actor alias Mobilizon.Events.{Event, FeedToken} alias Mobilizon.Users.User @doc """ Export a public event to iCalendar format. The event must have a visibility of `:public` or `:unlisted` """ @spec export_public_event(Event.t()) :: {:ok, String.t()} def export_public_event(%Event{visibility: visibility} = event) when visibility in [:public, :unlisted] do {:ok, %ICalendar{events: [do_export_event(event)]} |> ICalendar.to_ics(vendor: "Mobilizon")} end @spec export_public_event(Event.t()) :: {:error, :event_not_public} def export_public_event(%Event{}), do: {:error, :event_not_public} @spec do_export_event(Event.t()) :: ICalendar.Event.t() defp do_export_event(%Event{} = event) do %ICalendar.Event{ summary: event.title, dtstart: event.begins_on, dtstamp: event.publish_at || DateTime.utc_now(), dtend: event.ends_on, description: event.description, uid: event.uuid, categories: event.tags |> Enum.map(& &1.slug) } end @doc """ Export a public actor's events to iCalendar format. The actor must have a visibility of `:public` or `:unlisted`, as well as the events """ @spec export_public_actor(Actor.t()) :: String.t() def export_public_actor(%Actor{} = actor) do with true <- Actor.is_public_visibility(actor), {:ok, events, _} <- Events.list_public_events_for_actor(actor) do {:ok, %ICalendar{events: events |> Enum.map(&do_export_event/1)} |> ICalendar.to_ics()} end end @spec export_private_actor(Actor.t()) :: String.t() def export_private_actor(%Actor{} = actor) do with events <- actor |> Events.list_event_participations_for_actor() |> participations_to_events() do {:ok, %ICalendar{events: events |> Enum.map(&do_export_event/1)} |> ICalendar.to_ics()} end end @doc """ Create cache for an actor """ def create_cache("actor_" <> name) do with %Actor{} = actor <- Actors.get_local_actor_by_name(name), {:ok, res} <- export_public_actor(actor) do {:commit, res} else err -> {:ignore, err} end end @doc """ Create cache for an actor """ def create_cache("event_" <> uuid) do with %Event{} = event <- Events.get_public_event_by_uuid_with_preload(uuid), {:ok, res} <- export_public_event(event) do {:commit, res} else err -> {:ignore, err} end end @doc """ Create cache for an actor """ def create_cache("token_" <> token) do case fetch_events_from_token(token) do {:ok, res} -> {:commit, res} err -> {:ignore, err} end end @spec fetch_events_from_token(String.t()) :: String.t() defp fetch_events_from_token(token) do with %FeedToken{actor: actor, user: %User{} = user} <- Events.get_feed_token(token) do case actor do %Actor{} = actor -> export_private_actor(actor) nil -> with actors <- Users.get_actors_for_user(user), events <- actors |> Enum.map(fn actor -> actor |> Events.list_event_participations_for_actor() |> participations_to_events() end) |> Enum.concat() do {:ok, %ICalendar{events: events |> Enum.map(&do_export_event/1)} |> ICalendar.to_ics()} end end end end defp participations_to_events(participations) do participations |> Enum.map(& &1.event_id) |> Enum.map(&Events.get_event_with_preload!/1) end end