mobilizon/lib/federation/activity_pub/actor.ex

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defmodule Mobilizon.Federation.ActivityPub.Actor do
@moduledoc """
Module to handle ActivityPub Actor interactions
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Federation.ActivityPub.{Fetcher, Relay}
alias Mobilizon.Federation.WebFinger
alias Mobilizon.Web.Endpoint
require Logger
import Mobilizon.Federation.ActivityPub.Utils, only: [are_same_origin?: 2]
@doc """
Getting an actor from url, eventually creating it if we don't have it locally or if it needs an update
"""
@spec get_or_fetch_actor_by_url(String.t(), boolean) :: {:ok, Actor.t()} | {:error, String.t()}
def get_or_fetch_actor_by_url(url, preload \\ false)
def get_or_fetch_actor_by_url(nil, _preload), do: {:error, "Can't fetch a nil url"}
def get_or_fetch_actor_by_url("https://www.w3.org/ns/activitystreams#Public", _preload) do
with %Actor{url: url} <- Relay.get_actor() do
get_or_fetch_actor_by_url(url)
end
end
@spec get_or_fetch_actor_by_url(String.t(), boolean()) :: {:ok, Actor.t()} | {:error, any()}
def get_or_fetch_actor_by_url(url, preload) do
with {:ok, %Actor{} = cached_actor} <- Actors.get_actor_by_url(url, preload),
false <- Actors.needs_update?(cached_actor) do
{:ok, cached_actor}
else
_ ->
# For tests, see https://github.com/jjh42/mock#not-supported---mocking-internal-function-calls and Mobilizon.Federation.ActivityPubTest
case __MODULE__.make_actor_from_url(url, preload) do
{:ok, %Actor{} = actor} ->
{:ok, actor}
{:error, err} ->
Logger.debug("Could not fetch by AP id")
Logger.debug(inspect(err))
{:error, "Could not fetch by AP id"}
end
end
end
@doc """
Create an actor locally by its URL (AP ID)
"""
@spec make_actor_from_url(String.t(), boolean()) ::
{:ok, %Actor{}} | {:error, :actor_deleted} | {:error, :http_error} | {:error, any()}
def make_actor_from_url(url, preload \\ false) do
if are_same_origin?(url, Endpoint.url()) do
{:error, "Can't make a local actor from URL"}
else
case Fetcher.fetch_and_prepare_actor_from_url(url) do
# Just in case
{:ok, {:error, _e}} ->
raise ArgumentError, message: "Failed to make actor from url #{url}"
{:ok, data} ->
Actors.upsert_actor(data, preload)
# Request returned 410
{:error, :actor_deleted} ->
Logger.info("Actor was deleted")
{:error, :actor_deleted}
{:error, :http_error} ->
{:error, :http_error}
{:error, e} ->
Logger.warn("Failed to make actor from url #{url}")
{:error, e}
end
end
end
@doc """
Find an actor in our local database or call WebFinger to find what's its AP ID is and then fetch it
"""
@spec find_or_make_actor_from_nickname(String.t(), atom() | nil) ::
{:ok, Actor.t()} | {:error, any()}
def find_or_make_actor_from_nickname(nickname, type \\ nil) do
case Actors.get_actor_by_name_with_preload(nickname, type) do
%Actor{url: actor_url} = actor ->
if Actors.needs_update?(actor) do
make_actor_from_url(actor_url, true)
else
{:ok, actor}
end
nil ->
make_actor_from_nickname(nickname, true)
end
end
@spec find_or_make_group_from_nickname(String.t()) :: tuple()
def find_or_make_group_from_nickname(nick), do: find_or_make_actor_from_nickname(nick, :Group)
@doc """
Create an actor inside our database from username, using WebFinger to find out its AP ID and then fetch it
"""
@spec make_actor_from_nickname(String.t()) :: {:ok, %Actor{}} | {:error, any()}
def make_actor_from_nickname(nickname, preload \\ false) do
case WebFinger.finger(nickname) do
{:ok, url} when is_binary(url) ->
make_actor_from_url(url, preload)
{:error, _e} ->
{:error, "No ActivityPub URL found in WebFinger"}
end
end
end