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