mobilizon/lib/federation/activity_stream/converter/resource.ex

133 lines
3.9 KiB
Elixir

defmodule Mobilizon.Federation.ActivityStream.Converter.Resource do
@moduledoc """
Resource converter.
This module allows to convert resources from ActivityStream format to our own
internal one, and back.
"""
alias Mobilizon.Actors.Actor
alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
alias Mobilizon.Federation.ActivityPub.Utils
alias Mobilizon.Federation.ActivityStream.{Converter, Convertible}
alias Mobilizon.Resources
alias Mobilizon.Resources.Resource
require Logger
@behaviour Converter
defimpl Convertible, for: Resource do
alias Mobilizon.Federation.ActivityStream.Converter.Resource, as: ResourceConverter
defdelegate model_to_as(resource), to: ResourceConverter
end
@doc """
Convert an resource struct to an ActivityStream representation
"""
@impl Converter
@spec model_to_as(Resource.t()) :: map
def model_to_as(
%Resource{actor: %Actor{url: actor_url}, creator: %Actor{url: creator_url}, type: type} =
resource
) do
res = %{
"actor" => creator_url,
"id" => resource.url,
"name" => resource.title,
"summary" => resource.summary,
"context" => get_context(resource),
"attributedTo" => actor_url,
"published" => resource.published_at |> DateTime.to_iso8601()
}
case type do
:folder ->
Map.put(res, "type", "ResourceCollection")
_ ->
res
|> Map.put("type", "Document")
|> Map.put("url", resource.resource_url)
end
end
@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(%{"type" => type, "actor" => creator, "attributedTo" => group} = object) do
with {:ok, %Actor{id: actor_id, resources_url: resources_url}} <- get_actor(group),
{:ok, %Actor{id: creator_id}} <- get_actor(creator),
parent_id <- get_parent_id(object["context"], resources_url) do
data = %{
title: object["name"],
summary: object["summary"],
url: object["id"],
actor_id: actor_id,
creator_id: creator_id,
parent_id: parent_id,
published_at: object["published"]
}
case type do
"Document" ->
data
|> Map.put(:type, :link)
|> Map.put(:resource_url, object["url"])
"ResourceCollection" ->
data
|> Map.put(:type, :folder)
end
else
{:error, err} -> {:error, err}
err -> {:error, err}
end
end
@spec get_actor(String.t() | map() | nil) :: {:ok, Actor.t()} | {:error, String.t()}
defp get_actor(nil), do: {:error, "nil property found for actor data"}
defp get_actor(actor),
do: actor |> Utils.get_url() |> ActivityPubActor.get_or_fetch_actor_by_url()
defp get_context(%Resource{parent_id: nil, actor: %Actor{resources_url: resources_url}}),
do: resources_url
defp get_context(%Resource{parent: %Resource{url: url}}), do: url
defp get_context(%Resource{parent_id: parent_id}),
do: parent_id |> Resources.get_resource() |> Map.get(:url)
@spec get_parent_id(String.t(), String.t()) :: Resource.t() | map()
defp get_parent_id(context, resources_url) do
Logger.debug(
"Getting parentID for context #{inspect(context)} and with resources_url #{inspect(resources_url)}"
)
case Utils.get_url(context) do
nil -> nil
^resources_url -> nil
context_url -> fetch_resource(context_url)
end
end
defp fetch_resource(context_url) do
case Resources.get_resource_by_url(context_url) do
%Resource{id: resource_id} = _resource ->
resource_id
nil ->
case ActivityPub.fetch_object_from_url(context_url) do
{:ok, %Resource{id: resource_id} = _resource} ->
resource_id
_ ->
nil
end
end
end
end