144 lines
4.1 KiB
Elixir
144 lines
4.1 KiB
Elixir
# Pleroma: A lightweight social networking server
|
|
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
|
|
# SPDX-License-Identifier: AGPL-3.0-only
|
|
|
|
defmodule Pleroma.Object.Fetcher do
|
|
alias Pleroma.HTTP
|
|
alias Pleroma.Object
|
|
alias Pleroma.Object.Containment
|
|
alias Pleroma.Signature
|
|
alias Pleroma.Web.ActivityPub.InternalFetchActor
|
|
alias Pleroma.Web.ActivityPub.Transmogrifier
|
|
alias Pleroma.Web.OStatus
|
|
|
|
require Logger
|
|
|
|
defp reinject_object(data) do
|
|
Logger.debug("Reinjecting object #{data["id"]}")
|
|
|
|
with data <- Transmogrifier.fix_object(data),
|
|
{:ok, object} <- Object.create(data) do
|
|
{:ok, object}
|
|
else
|
|
e ->
|
|
Logger.error("Error while processing object: #{inspect(e)}")
|
|
{:error, e}
|
|
end
|
|
end
|
|
|
|
# TODO:
|
|
# This will create a Create activity, which we need internally at the moment.
|
|
def fetch_object_from_id(id, options \\ []) do
|
|
if object = Object.get_cached_by_ap_id(id) do
|
|
{:ok, object}
|
|
else
|
|
Logger.info("Fetching #{id} via AP")
|
|
|
|
with {:fetch, {:ok, data}} <- {:fetch, fetch_and_contain_remote_object_from_id(id)},
|
|
{:normalize, nil} <- {:normalize, Object.normalize(data, false)},
|
|
params <- %{
|
|
"type" => "Create",
|
|
"to" => data["to"],
|
|
"cc" => data["cc"],
|
|
# Should we seriously keep this attributedTo thing?
|
|
"actor" => data["actor"] || data["attributedTo"],
|
|
"object" => data
|
|
},
|
|
{:containment, :ok} <- {:containment, Containment.contain_origin(id, params)},
|
|
{:ok, activity} <- Transmogrifier.handle_incoming(params, options),
|
|
{:object, _data, %Object{} = object} <-
|
|
{:object, data, Object.normalize(activity, false)} do
|
|
{:ok, object}
|
|
else
|
|
{:containment, _} ->
|
|
{:error, "Object containment failed."}
|
|
|
|
{:error, {:reject, nil}} ->
|
|
{:reject, nil}
|
|
|
|
{:object, data, nil} ->
|
|
reinject_object(data)
|
|
|
|
{:normalize, object = %Object{}} ->
|
|
{:ok, object}
|
|
|
|
_e ->
|
|
# Only fallback when receiving a fetch/normalization error with ActivityPub
|
|
Logger.info("Couldn't get object via AP, trying out OStatus fetching...")
|
|
|
|
# FIXME: OStatus Object Containment?
|
|
case OStatus.fetch_activity_from_url(id) do
|
|
{:ok, [activity | _]} -> {:ok, Object.normalize(activity, false)}
|
|
e -> e
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
def fetch_object_from_id!(id, options \\ []) do
|
|
with {:ok, object} <- fetch_object_from_id(id, options) do
|
|
object
|
|
else
|
|
_e ->
|
|
nil
|
|
end
|
|
end
|
|
|
|
defp make_signature(id, date) do
|
|
uri = URI.parse(id)
|
|
|
|
signature =
|
|
InternalFetchActor.get_actor()
|
|
|> Signature.sign(%{
|
|
"(request-target)": "get #{uri.path}",
|
|
host: uri.host,
|
|
date: date
|
|
})
|
|
|
|
[{:Signature, signature}]
|
|
end
|
|
|
|
defp sign_fetch(headers, id, date) do
|
|
if Pleroma.Config.get([:activitypub, :sign_object_fetches]) do
|
|
headers ++ make_signature(id, date)
|
|
else
|
|
headers
|
|
end
|
|
end
|
|
|
|
defp maybe_date_fetch(headers, date) do
|
|
if Pleroma.Config.get([:activitypub, :sign_object_fetches]) do
|
|
headers ++ [{:Date, date}]
|
|
else
|
|
headers
|
|
end
|
|
end
|
|
|
|
def fetch_and_contain_remote_object_from_id(id) do
|
|
Logger.info("Fetching object #{id} via AP")
|
|
|
|
date =
|
|
NaiveDateTime.utc_now()
|
|
|> Timex.format!("{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT")
|
|
|
|
headers =
|
|
[{:Accept, "application/activity+json"}]
|
|
|> maybe_date_fetch(date)
|
|
|> sign_fetch(id, date)
|
|
|
|
Logger.debug("Fetch headers: #{inspect(headers)}")
|
|
|
|
with true <- String.starts_with?(id, "http"),
|
|
{:ok, %{body: body, status: code}} when code in 200..299 <- HTTP.get(id, headers),
|
|
{:ok, data} <- Jason.decode(body),
|
|
:ok <- Containment.contain_origin_from_id(id, data) do
|
|
{:ok, data}
|
|
else
|
|
{:ok, %{status: code}} when code in [404, 410] ->
|
|
{:error, "Object has been deleted"}
|
|
|
|
e ->
|
|
{:error, e}
|
|
end
|
|
end
|
|
end
|