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

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defmodule Mobilizon.Service.ActivityPub.Converter.Event do
@moduledoc """
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Event converter.
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This module allows to convert events from ActivityStream format to our own
internal one, and back.
"""
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alias Mobilizon.{Actors, Addresses, Events, Media}
alias Mobilizon.Actors.Actor
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alias Mobilizon.Addresses.Address
alias Mobilizon.Events.Event, as: EventModel
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alias Mobilizon.Events.{EventOptions, Tag}
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alias Mobilizon.Media.Picture
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alias Mobilizon.Service.ActivityPub.{Converter, Convertible, Utils}
alias Mobilizon.Service.ActivityPub.Converter.Address, as: AddressConverter
alias Mobilizon.Service.ActivityPub.Converter.Picture, as: PictureConverter
require Logger
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@behaviour Converter
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defimpl Convertible, for: EventModel do
alias Mobilizon.Service.ActivityPub.Converter.Event, as: EventConverter
defdelegate model_to_as(event), to: EventConverter
end
@doc """
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Converts an AP object data to our internal data structure.
"""
@impl Converter
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@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"])},
{:visibility, visibility} <- {:visibility, get_visibility(object)},
{:options, options} <- {:options, get_options(object)} 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
entity = %{
"title" => object["name"],
"description" => object["content"],
"organizer_actor_id" => actor_id,
"picture_id" => picture_id,
"begins_on" => object["startTime"],
"ends_on" => object["endTime"],
"category" => object["category"],
"visibility" => visibility,
"join_options" => object["joinOptions"],
"status" => object["status"],
"online_address" => object["onlineAddress"],
"phone_address" => object["phoneAddress"],
"url" => object["id"],
"uuid" => object["uuid"],
"tags" => tags,
"physical_address_id" => address_id
}
{:ok, Map.put(entity, "options", options)}
else
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error ->
{:error, error}
end
end
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@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(),
"joinOptions" => to_string(event.join_options),
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"endTime" => event.ends_on |> date_to_string(),
"tag" => event.tags |> build_tags(),
"id" => event.url,
"url" => 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", [PictureConverter.model_to_as(event.picture)])
end
# Get only elements that we have in EventOptions
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@spec get_options(map) :: map
defp get_options(object) do
keys =
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EventOptions
|> struct
|> Map.keys()
|> List.delete(:__struct__)
|> Enum.map(&Utils.camelize/1)
Enum.reduce(object, %{}, fn {key, value}, acc ->
(value && key in keys && Map.put(acc, Utils.underscore(key), value)) ||
acc
end)
end
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@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
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@spec do_get_address(map) :: integer | nil
defp do_get_address(map) do
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map = Mobilizon.Service.ActivityPub.Converter.Address.as_to_model_data(map)
case Addresses.create_address(map) do
{:ok, %Address{id: address_id}} ->
address_id
_ ->
nil
end
end
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@spec fetch_tags([String.t()]) :: [String.t()]
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
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@spec build_tags([String.t()]) :: String.t()
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
@ap_public "https://www.w3.org/ns/activitystreams#Public"
defp get_visibility(object) do
cond do
@ap_public in object["to"] -> :public
@ap_public in object["cc"] -> :unlisted
true -> :private
end
end
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@spec date_to_string(DateTime.t() | nil) :: String.t()
defp date_to_string(nil), do: nil
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defp date_to_string(%DateTime{} = date), do: DateTime.to_iso8601(date)
end