defmodule Mobilizon.Federation.ActivityStream.Converter.Event do
@moduledoc """
Event converter.
This module allows to convert events from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Actors.Actor
alias Mobilizon.Addresses
alias Mobilizon.Addresses.Address
alias Mobilizon.Events.Event, as: EventModel
alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
alias Mobilizon.Federation.ActivityStream.Converter.Address, as: AddressConverter
alias Mobilizon.Federation.ActivityStream.Converter.Media, as: MediaConverter
import Mobilizon.Federation.ActivityStream.Converter.Utils,
only: [
fetch_tags: 1,
fetch_mentions: 1,
build_tags: 1,
maybe_fetch_actor_and_attributed_to_id: 1,
process_pictures: 2
]
require Logger
@behaviour Converter
defimpl Convertible, for: EventModel do
alias Mobilizon.Federation.ActivityStream.Converter.Event, as: EventConverter
defdelegate model_to_as(event), to: EventConverter
end
@online_address_name "Website"
@banner_picture_name "Banner"
@doc """
Converts an AP object data to our internal data structure.
"""
@impl Converter
@spec as_to_model_data(map) :: {:ok, map()} | {:error, any()}
def as_to_model_data(object) do
with {%Actor{id: actor_id, domain: actor_domain}, attributed_to} <-
maybe_fetch_actor_and_attributed_to_id(object),
{:address, address_id} <-
{:address, get_address(object["location"])},
{:tags, tags} <- {:tags, fetch_tags(object["tag"])},
{:mentions, mentions} <- {:mentions, fetch_mentions(object["tag"])},
{:visibility, visibility} <- {:visibility, get_visibility(object)},
{:options, options} <- {:options, get_options(object)},
[description: description, picture_id: picture_id, medias: medias] <-
process_pictures(object, actor_id) do
%{
title: object["name"],
description: description,
organizer_actor_id: actor_id,
attributed_to_id: if(is_nil(attributed_to), do: nil, else: attributed_to.id),
picture_id: picture_id,
medias: medias,
begins_on: object["startTime"],
ends_on: object["endTime"],
category: object["category"],
visibility: visibility,
join_options: Map.get(object, "joinMode", "free"),
local: is_nil(actor_domain),
options: options,
status: object |> Map.get("ical:status", "CONFIRMED") |> String.downcase(),
online_address: object |> Map.get("attachment", []) |> get_online_address(),
phone_address: object["phoneAddress"],
draft: false,
url: object["id"],
uuid: object["uuid"],
tags: tags,
mentions: mentions,
physical_address_id: address_id,
updated_at: object["updated"],
publish_at: object["published"]
}
else
{:ok, %Actor{suspended: true}} ->
:error
end
end
@doc """
Convert an event struct to an ActivityStream representation.
"""
@impl Converter
@spec model_to_as(EventModel.t()) :: map
def model_to_as(%EventModel{} = event) do
to =
if event.visibility == :public,
do: ["https://www.w3.org/ns/activitystreams#Public"],
else: [event.organizer_actor.followers_url]
%{
"type" => "Event",
"to" => to,
"cc" => [],
"attributedTo" =>
if(is_nil(event.attributed_to) or not Ecto.assoc_loaded?(event.attributed_to),
do: nil,
else: event.attributed_to.url
) ||
event.organizer_actor.url,
"name" => event.title,
"actor" =>
if(Ecto.assoc_loaded?(event.organizer_actor), do: event.organizer_actor.url, else: nil),
"uuid" => event.uuid,
"category" => event.category,
"content" => event.description,
"published" => (event.publish_at || event.inserted_at) |> date_to_string(),
"updated" => event.updated_at |> date_to_string(),
"mediaType" => "text/html",
"startTime" => event.begins_on |> date_to_string(),
"joinMode" => to_string(event.join_options),
"endTime" => event.ends_on |> date_to_string(),
"tag" => event.tags |> build_tags(),
"maximumAttendeeCapacity" => event.options.maximum_attendee_capacity,
"repliesModerationOption" => event.options.comment_moderation,
"commentsEnabled" => event.options.comment_moderation == :allow_all,
"anonymousParticipationEnabled" => event.options.anonymous_participation,
"attachment" => [],
# "draft" => event.draft,
"ical:status" => event.status |> to_string |> String.upcase(),
"id" => event.url,
"url" => event.url
}
|> maybe_add_physical_address(event)
|> maybe_add_event_picture(event)
|> maybe_add_online_address(event)
|> maybe_add_inline_media(event)
end
# Get only elements that we have in EventOptions
@spec get_options(map) :: map
defp get_options(object) do
%{
maximum_attendee_capacity: object["maximumAttendeeCapacity"],
anonymous_participation: object["anonymousParticipationEnabled"],
comment_moderation:
Map.get(
object,
"repliesModerationOption",
if(Map.get(object, "commentsEnabled", true), do: :allow_all, else: :closed)
)
}
end
@spec get_address(map | binary | nil) :: integer | nil
defp get_address(address_url) when is_bitstring(address_url) do
get_address(%{"id" => address_url})
end
defp get_address(%{"id" => url} = map) when is_map(map) and is_binary(url) do
Logger.debug("Address with an URL, let's check against our own database")
case Addresses.get_address_by_url(url) do
%Address{id: address_id} ->
address_id
_ ->
Logger.debug("not in our database, let's try to create it")
map = Map.put(map, "url", map["id"])
do_get_address(map)
end
end
defp get_address(map) when is_map(map) do
do_get_address(map)
end
defp get_address(nil), do: nil
@spec do_get_address(map) :: integer | nil
defp do_get_address(map) do
map = AddressConverter.as_to_model_data(map)
case Addresses.create_address(map) do
{:ok, %Address{id: address_id}} ->
address_id
_ ->
nil
end
end
@ap_public "https://www.w3.org/ns/activitystreams#Public"
defp get_visibility(object), do: if(@ap_public in object["to"], do: :public, else: :unlisted)
@spec date_to_string(DateTime.t() | nil) :: String.t()
defp date_to_string(nil), do: nil
defp date_to_string(%DateTime{} = date), do: DateTime.to_iso8601(date)
defp get_online_address(attachments) do
Enum.find_value(attachments, fn attachment ->
case attachment do
%{
"type" => "Link",
"href" => url,
"mediaType" => "text/html",
"name" => @online_address_name
} ->
url
_ ->
nil
end
end)
end
@spec maybe_add_physical_address(map(), Event.t()) :: map()
defp maybe_add_physical_address(res, event) do
if is_nil(event.physical_address),
do: res,
else: Map.put(res, "location", AddressConverter.model_to_as(event.physical_address))
end
@spec maybe_add_event_picture(map(), Event.t()) :: map()
defp maybe_add_event_picture(res, event) do
if is_nil(event.picture),
do: res,
else:
Map.update(
res,
"attachment",
[],
&(&1 ++
[
event.picture
|> MediaConverter.model_to_as()
|> Map.put("name", @banner_picture_name)
])
)
end
@spec maybe_add_online_address(map(), Event.t()) :: map()
defp maybe_add_online_address(res, event) do
if is_nil(event.online_address),
do: res,
else:
Map.update(
res,
"attachment",
[],
&(&1 ++
[
%{
"type" => "Link",
"href" => event.online_address,
"mediaType" => "text/html",
"name" => @online_address_name
}
])
)
end
@spec maybe_add_inline_media(map(), Event.t()) :: map()
defp maybe_add_inline_media(res, event) do
medias = Enum.map(event.media, &MediaConverter.model_to_as/1)
Map.update(
res,
"attachment",
[],
&(&1 ++ medias)
)
end
end