debianize-mobilizon/lib/federation/activity_pub/fetcher.ex

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Elixir
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defmodule Mobilizon.Federation.ActivityPub.Fetcher do
@moduledoc """
Module to handle direct URL ActivityPub fetches to remote content
If you need to first get cached data, see `Mobilizon.Federation.ActivityPub.fetch_object_from_url/2`
"""
require Logger
alias Mobilizon.Federation.HTTPSignatures.Signature
alias Mobilizon.Federation.ActivityPub.{Relay, Transmogrifier}
alias Mobilizon.Federation.ActivityStream.Converter.Actor, as: ActorConverter
alias Mobilizon.Service.ErrorReporting.Sentry
alias Mobilizon.Service.HTTP.ActivityPub, as: ActivityPubClient
import Mobilizon.Federation.ActivityPub.Utils,
only: [maybe_date_fetch: 2, sign_fetch: 4, origin_check?: 2]
import Mobilizon.Service.Guards, only: [is_valid_string: 1]
@spec fetch(String.t(), Keyword.t()) ::
{:ok, map()}
| {:error,
:invalid_url | :http_gone | :http_error | :http_not_found | :content_not_json}
def fetch(url, options \\ []) do
on_behalf_of = Keyword.get(options, :on_behalf_of, Relay.get_actor())
date = Signature.generate_date_header()
headers =
[{:Accept, "application/activity+json"}]
|> maybe_date_fetch(date)
|> sign_fetch(on_behalf_of, url, date)
client = ActivityPubClient.client(headers: headers)
if address_valid?(url) do
case ActivityPubClient.get(client, url) do
{:ok, %Tesla.Env{body: data, status: code}} when code in 200..299 and is_map(data) ->
{:ok, data}
{:ok, %Tesla.Env{status: 410}} ->
Logger.debug("Resource at #{url} is 410 Gone")
{:error, :http_gone}
{:ok, %Tesla.Env{status: 404}} ->
Logger.debug("Resource at #{url} is 404 Gone")
{:error, :http_not_found}
{:ok, %Tesla.Env{body: data}} when is_binary(data) ->
{:error, :content_not_json}
{:ok, %Tesla.Env{} = res} ->
Logger.debug("Resource returned bad HTTP code #{inspect(res)}")
{:error, :http_error}
{:error, err} ->
{:error, err}
end
else
{:error, :invalid_url}
end
end
@spec fetch_and_create(String.t(), Keyword.t()) ::
{:ok, map(), struct()} | {:error, atom()} | :error
def fetch_and_create(url, options \\ []) do
case fetch(url, options) do
{:ok, data} when is_map(data) ->
if origin_check?(url, data) do
case Transmogrifier.handle_incoming(%{
"type" => "Create",
"to" => data["to"],
"cc" => data["cc"],
"actor" => data["actor"] || data["attributedTo"],
"attributedTo" => data["attributedTo"] || data["actor"],
"object" => data
}) do
{:ok, entity, structure} ->
{:ok, entity, structure}
{:error, error} when is_atom(error) ->
{:error, error}
:error ->
{:error, :transmogrifier_error}
end
else
Logger.warn("Object origin check failed")
{:error, :object_origin_check_failed}
end
{:error, err} ->
{:error, err}
end
end
@spec fetch_and_update(String.t(), Keyword.t()) ::
{:ok, map(), struct()} | {:error, atom()}
def fetch_and_update(url, options \\ []) do
case fetch(url, options) do
{:ok, data} when is_map(data) ->
if origin_check(url, data) do
Transmogrifier.handle_incoming(%{
"type" => "Update",
"to" => data["to"],
"cc" => data["cc"],
"actor" => data["actor"] || data["attributedTo"],
"attributedTo" => data["attributedTo"] || data["actor"],
"object" => data
})
else
Logger.warn("Object origin check failed")
{:error, :object_origin_check_failed}
end
{:error, err} ->
{:error, err}
end
end
@type fetch_actor_errors ::
:json_decode_error | :actor_deleted | :http_error | :actor_not_allowed_type
@doc """
Fetching a remote actor's information through its AP ID
"""
@spec fetch_and_prepare_actor_from_url(String.t()) ::
{:ok, map()} | {:error, fetch_actor_errors}
def fetch_and_prepare_actor_from_url(url, options \\ []) do
Logger.debug("Fetching and preparing actor from url")
Logger.debug(inspect(url))
case fetch(url, options) do
{:ok, data} ->
case ActorConverter.as_to_model_data(data) do
{:error, :actor_not_allowed_type} ->
{:error, :actor_not_allowed_type}
map when is_map(map) ->
{:ok, map}
end
{:error, :http_gone} ->
Logger.info("Response HTTP 410")
{:error, :actor_deleted}
{:error, :http_error} ->
Logger.info("Non 200 HTTP Code")
{:error, :http_error}
{:error, error} ->
Logger.warn("Could not fetch actor at fetch #{url}, #{inspect(error)}")
{:error, :http_error}
end
end
@spec origin_check(String.t(), map()) :: boolean()
defp origin_check(url, data) do
if origin_check?(url, data) do
true
else
Sentry.capture_message("Object origin check failed", extra: %{url: url, data: data})
Logger.debug("Object origin check failed between #{inspect(url)} and #{inspect(data)}")
false
end
end
@spec address_valid?(String.t()) :: boolean
defp address_valid?(address) do
%URI{host: host, scheme: scheme} = URI.parse(address)
is_valid_string(host) and is_valid_string(scheme)
end
end