mobilizon/lib/service/export/icalendar.ex

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Elixir
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defmodule Mobilizon.Service.Export.ICalendar do
@moduledoc """
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Export an event to iCalendar format.
"""
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alias Mobilizon.{Actors, Events, Users}
alias Mobilizon.Actors.Actor
alias Mobilizon.Addresses.Address
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alias Mobilizon.Events.{Event, FeedToken}
alias Mobilizon.Service.Formatter.HTML
alias Mobilizon.Storage.Page
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: 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
@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 {:visibility, true} <- {:visibility, Actor.is_public_visibility?(actor)},
%Page{elements: 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, an event or an user token
"""
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
def create_cache("event_" <> uuid) do
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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
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(%Page{elements: participations}) do
participations
|> Enum.map(& &1.event_id)
|> Enum.map(&Events.get_event_with_preload!/1)
end
end