federator: normalize only actor, catch actor error

[akkoma] / lib / pleroma / web / federator / federator.ex

diff --git a/lib/pleroma/web/federator/federator.ex b/lib/pleroma/web/federator/federator.ex
index 1a2da014ae054999325a55eaf1c844a12d1210e4..e4ab9ba32a538845dedbba040164d3f90a68aae7 100644 (file)
--- a/lib/pleroma/web/federator/federator.ex
+++ b/lib/pleroma/web/federator/federator.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.Federator do
@@ -10,26 +10,24 @@ defmodule Pleroma.Web.Federator do
   alias Pleroma.Web.ActivityPub.Transmogrifier
   alias Pleroma.Web.ActivityPub.Utils
   alias Pleroma.Web.Federator.Publisher
-  alias Pleroma.Web.OStatus
-  alias Pleroma.Web.Websub
   alias Pleroma.Workers.PublisherWorker
   alias Pleroma.Workers.ReceiverWorker
-  alias Pleroma.Workers.SubscriberWorker
 
   require Logger
 
-  def init do
-    # To do: consider removing this call in favor of scheduled execution (`quantum`-based)
-    refresh_subscriptions(schedule_in: 60)
-  end
-
-  @doc "Addresses [memory leaks on recursive replies fetching](https://git.pleroma.social/pleroma/pleroma/issues/161)"
+  @doc """
+  Returns `true` if the distance to target object does not exceed max configured value.
+  Serves to prevent fetching of very long threads, especially useful on smaller instances.
+  Addresses [memory leaks on recursive replies fetching](https://git.pleroma.social/pleroma/pleroma/issues/161).
+  Applies to fetching of both ancestor (reply-to) and child (reply) objects.
+  """
   # credo:disable-for-previous-line Credo.Check.Readability.MaxLineLength
-  def allowed_incoming_reply_depth?(depth) do
-    max_replies_depth = Pleroma.Config.get([:instance, :federation_incoming_replies_max_depth])
+  def allowed_thread_distance?(distance) do
+    max_distance = Pleroma.Config.get([:instance, :federation_incoming_replies_max_depth])
 
-    if max_replies_depth do
-      (depth || 1) <= max_replies_depth
+    if max_distance && max_distance >= 0 do
+      # Default depth is 0 (an object has zero distance from itself in its thread)
+      (distance || 0) <= max_distance
     else
       true
     end
@@ -37,10 +35,6 @@ defmodule Pleroma.Web.Federator do
 
   # Client API
 
-  def incoming_doc(doc) do
-    ReceiverWorker.enqueue("incoming_doc", %{"body" => doc})
-  end
-
   def incoming_ap_doc(params) do
     ReceiverWorker.enqueue("incoming_ap_doc", %{"params" => params})
   end
@@ -53,18 +47,6 @@ defmodule Pleroma.Web.Federator do
     PublisherWorker.enqueue("publish", %{"activity_id" => activity.id})
   end
 
-  def verify_websub(websub) do
-    SubscriberWorker.enqueue("verify_websub", %{"websub_id" => websub.id})
-  end
-
-  def request_subscription(websub) do
-    SubscriberWorker.enqueue("request_subscription", %{"websub_id" => websub.id})
-  end
-
-  def refresh_subscriptions(worker_args \\ []) do
-    SubscriberWorker.enqueue("refresh_subscriptions", %{}, worker_args ++ [max_attempts: 1])
-  end
-
   # Job Worker Callbacks
 
   @spec perform(atom(), module(), any()) :: {:ok, any()} | {:error, any()}
@@ -81,59 +63,42 @@ defmodule Pleroma.Web.Federator do
     end
   end
 
-  def perform(:incoming_doc, doc) do
-    Logger.info("Got document, trying to parse")
-    OStatus.handle_incoming(doc)
-  end
-
   def perform(:incoming_ap_doc, params) do
-    Logger.info("Handling incoming AP activity")
+    Logger.debug("Handling incoming AP activity")
 
-    params = Utils.normalize_params(params)
+    actor =
+      params
+      |> Map.get("actor")
+      |> Utils.get_ap_id()
 
     # NOTE: we use the actor ID to do the containment, this is fine because an
     # actor shouldn't be acting on objects outside their own AP server.
-    with {:ok, _user} <- ap_enabled_actor(params["actor"]),
+    with {_, {:ok, _user}} <- {:actor, ap_enabled_actor(actor)},
          nil <- Activity.normalize(params["id"]),
-         :ok <- Containment.contain_origin_from_id(params["actor"], params),
+         {_, :ok} <-
+           {:correct_origin?, Containment.contain_origin_from_id(actor, params)},
          {:ok, activity} <- Transmogrifier.handle_incoming(params) do
       {:ok, activity}
     else
-      %Activity{} ->
-        Logger.info("Already had #{params["id"]}")
-        :error
+      {:correct_origin?, _} ->
+        Logger.debug("Origin containment failure for #{params["id"]}")
+        {:error, :origin_containment_failed}
 
-      _e ->
-        # Just drop those for now
-        Logger.info("Unhandled activity")
-        Logger.info(Jason.encode!(params, pretty: true))
-        :error
-    end
-  end
+      %Activity{} ->
+        Logger.debug("Already had #{params["id"]}")
+        {:error, :already_present}
 
-  def perform(:request_subscription, websub) do
-    Logger.debug("Refreshing #{websub.topic}")
+      {:actor, e} ->
+        Logger.debug("Unhandled actor #{actor}, #{inspect(e)}")
+        {:error, e}
 
-    with {:ok, websub} <- Websub.request_subscription(websub) do
-      Logger.debug("Successfully refreshed #{websub.topic}")
-    else
-      _e -> Logger.debug("Couldn't refresh #{websub.topic}")
+      e ->
+        # Just drop those for now
+        Logger.debug("Unhandled activity\n" <> Jason.encode!(params, pretty: true))
+        {:error, e}
     end
   end
 
-  def perform(:verify_websub, websub) do
-    Logger.debug(fn ->
-      "Running WebSub verification for #{websub.id} (#{websub.topic}, #{websub.callback})"
-    end)
-
-    Websub.verify(websub)
-  end
-
-  def perform(:refresh_subscriptions) do
-    Logger.debug("Federator running refresh subscriptions")
-    Websub.refresh_subscriptions()
-  end
-
   def ap_enabled_actor(id) do
     user = User.get_cached_by_ap_id(id)