mobilizon/lib/service/activity_pub/converters/event.ex

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defmodule Mobilizon.Service.ActivityPub.Converters.Event do
@moduledoc """
Event converter
This module allows to convert events from ActivityStream format to our own internal one, and back
"""
alias Mobilizon.Actors
alias Mobilizon.Media
alias Mobilizon.Media.Picture
alias Mobilizon.Actors.Actor
alias Mobilizon.Events.Event, as: EventModel
alias Mobilizon.Service.ActivityPub.Converter
alias Mobilizon.Service.ActivityPub.Converters.Address, as: AddressConverter
alias Mobilizon.Service.ActivityPub.Utils
alias Mobilizon.Events
alias Mobilizon.Events.Tag
alias Mobilizon.Addresses
alias Mobilizon.Addresses.Address
@behaviour Converter
require Logger
@doc """
Converts an AP object data to our internal data structure
"""
@impl Converter
@spec as_to_model_data(map()) :: map()
def as_to_model_data(object) do
Logger.debug("event as_to_model_data")
Logger.debug(inspect(object))
with {:actor, {:ok, %Actor{id: actor_id}}} <-
{:actor, Actors.get_actor_by_url(object["actor"])},
{:address, address_id} <-
{:address, get_address(object["location"])},
{:tags, tags} <- {:tags, fetch_tags(object["tag"])} do
picture_id =
with true <- Map.has_key?(object, "attachment") && length(object["attachment"]) > 0,
%Picture{id: picture_id} <-
Media.get_picture_by_url(
object["attachment"]
|> hd
|> Map.get("url")
|> hd
|> Map.get("href")
) do
picture_id
else
_ -> nil
end
{:ok,
%{
"title" => object["name"],
"description" => object["content"],
"organizer_actor_id" => actor_id,
"picture_id" => picture_id,
"begins_on" => object["startTime"],
"category" => object["category"],
"url" => object["id"],
"uuid" => object["uuid"],
"tags" => tags,
"physical_address_id" => address_id
}}
else
err ->
{:error, err}
end
end
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
defp do_get_address(map) do
map = Mobilizon.Service.ActivityPub.Converters.Address.as_to_model_data(map)
case Addresses.create_address(map) do
{:ok, %Address{id: address_id}} ->
address_id
_ ->
nil
end
end
defp fetch_tags(tags) do
Logger.debug("fetching tags")
Enum.reduce(tags, [], fn tag, acc ->
with true <- tag["type"] == "Hashtag",
{:ok, %Tag{} = tag} <- Events.get_or_create_tag(tag) do
acc ++ [tag]
else
_err ->
acc
end
end)
end
defp build_tags(tags) do
Enum.map(tags, fn %Tag{} = tag ->
%{
"href" => MobilizonWeb.Endpoint.url() <> "/tags/#{tag.slug}",
"name" => "##{tag.title}",
"type" => "Hashtag"
}
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]
res = %{
"type" => "Event",
"to" => to,
"cc" => [],
"attributedTo" => event.organizer_actor.url,
"name" => event.title,
"actor" => event.organizer_actor.url,
"uuid" => event.uuid,
"category" => event.category,
"content" => event.description,
"publish_at" => (event.publish_at || event.inserted_at) |> date_to_string(),
"updated_at" => event.updated_at |> date_to_string(),
"mediaType" => "text/html",
"startTime" => event.begins_on |> date_to_string(),
"endTime" => event.ends_on |> date_to_string(),
"tag" => event.tags |> build_tags(),
"id" => event.url
}
res =
if is_nil(event.physical_address),
do: res,
else: Map.put(res, "location", AddressConverter.model_to_as(event.physical_address))
if is_nil(event.picture),
do: res,
else: Map.put(res, "attachment", [Utils.make_picture_data(event.picture)])
end
defp date_to_string(nil), do: nil
defp date_to_string(date), do: DateTime.to_iso8601(date)
end
defimpl Mobilizon.Service.ActivityPub.Convertible, for: Mobilizon.Events.Event do
alias Mobilizon.Service.ActivityPub.Converters.Event, as: EventConverter
defdelegate model_to_as(event), to: EventConverter
end