defmodule Mobilizon.Service.Export.ICalendar do @moduledoc """ Export an event to iCalendar format. """ alias Mobilizon.Addresses.Address alias Mobilizon.{Config, Events} alias Mobilizon.Events.{Event, EventOptions} alias Mobilizon.Service.Export.Common alias Mobilizon.Service.Formatter.HTML @item_limit 500 @doc """ Create cache for an actor, an event or an user token """ @spec create_cache(String.t()) :: {:commit, String.t()} | {:ignore, atom()} def create_cache("actor_" <> name) do case export_public_actor(name) do {:ok, res} -> {:commit, res} {:error, err} -> {:ignore, err} end end 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 {:error, err} -> {:ignore, err} nil -> {:ignore, :event_not_found} end end def create_cache("token_" <> token) do case fetch_events_from_token(token) do {:ok, res} -> {:commit, res} {:error, err} -> {:ignore, err} end end def create_cache("instance") do {:ok, res} = fetch_instance_feed() {:commit, res} end @spec fetch_instance_feed :: {:ok, String.t()} defp fetch_instance_feed do {:ok, events, _posts} = Common.fetch_instance_public_content(@item_limit) {:ok, %ICalendar{events: events |> Enum.map(&do_export_event/1)} |> ICalendar.to_ics()} end @doc """ Export an event to iCalendar format. """ @spec export_event(Event.t()) :: {:ok, String.t()} def export_event(%Event{} = event), do: {:ok, events_to_ics([event])} @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()} | {:error, :event_not_public} def export_public_event(%Event{visibility: visibility} = event) when visibility in [:public, :unlisted] do {:ok, events_to_ics([event])} end def export_public_event(%Event{}), do: {:error, :event_not_public} # 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(String.t()) :: {:ok, String.t()} | {:error, :actor_not_public | :actor_not_found} defp export_public_actor(name, limit \\ @item_limit) do case Common.fetch_actor_event_feed(name, limit) do {:ok, _actor, events, _posts} -> {:ok, events_to_ics(events)} {:error, err} -> {:error, err} end end @spec fetch_events_from_token(String.t(), integer()) :: {:ok, String.t()} | {:error, :actor_not_public | :actor_not_found} defp fetch_events_from_token(token, limit \\ @item_limit) do case Common.fetch_events_from_token(token, limit) do %{events: events} -> {:ok, events_to_ics(events)} {:error, err} -> {:error, err} end end @spec events_to_ics(list(Events.t())) :: String.t() defp events_to_ics(events) do %ICalendar{events: events |> Enum.map(&do_export_event/1)} |> ICalendar.to_ics(vendor: vendor()) end @spec do_export_event(Event.t()) :: ICalendar.Event.t() defp do_export_event(%Event{} = event) do %ICalendar.Event{ summary: event.title, dtstart: begins_on(event), dtstamp: event.publish_at || DateTime.utc_now(), dtend: ends_on(event), description: HTML.strip_tags(event.description), uid: event.uuid, url: event.url, geo: Address.coords(event.physical_address), location: Address.representation(event.physical_address), categories: event.tags |> Enum.map(& &1.title) } end @spec vendor :: String.t() defp vendor do "Mobilizon #{Config.instance_version()}" end defp begins_on(%Event{begins_on: begins_on, options: %EventOptions{timezone: timezone}}) do shift_tz(begins_on, timezone) end defp ends_on(%Event{ends_on: ends_on, options: %EventOptions{timezone: timezone}}) do shift_tz(ends_on, timezone) end defp shift_tz(%DateTime{} = date, timezone) when is_binary(timezone) do DateTime.shift_zone!(date, timezone) end defp shift_tz(%DateTime{} = date, _), do: date end