Add recipients field to activities.

Also do some very basic checks for AP message insertion.

lib/pleroma/activity.ex

@@ -7,6 +7,7 @@ defmodule Pleroma.Activity do
     field :data, :map
     field :local, :boolean, default: true
     field :actor, :string
+    field :recipients, {:array, :string}
     has_many :notifications, Notification, on_delete: :delete_all
 
     timestamps()

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -1,14 +1,19 @@
 defmodule Pleroma.Web.ActivityPub.ActivityPub do
   alias Pleroma.{Activity, Repo, Object, Upload, User, Notification}
+  alias Pleroma.Web.OStatus
   import Ecto.Query
   import Pleroma.Web.ActivityPub.Utils
   require Logger
 
+  def get_recipients(data) do
+    (data["to"] || []) ++ (data["cc"] || [])
+  end
+
   def insert(map, local \\ true) when is_map(map) do
     with nil <- Activity.get_by_ap_id(map["id"]),
          map <- lazy_put_activity_defaults(map),
          :ok <- insert_full_object(map) do
-      {:ok, activity} = Repo.insert(%Activity{data: map, local: local, actor: map["actor"]})
+      {:ok, activity} = Repo.insert(%Activity{data: map, local: local, actor: map["actor"], recipients: get_recipients(map)})
       Notification.create_notifications(activity)
       stream_out(activity)
       {:ok, activity}
@@ -215,4 +220,16 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
     data = Upload.store(file)
     Repo.insert(%Object{data: data})
   end
+
+  def prepare_incoming(%{"type" => "Create", "object" => %{"type" => "Note"} = object} = data) do
+    with {:ok, user} <- OStatus.find_or_make_user(data["actor"]) do
+      data
+    else
+      _e -> :error
+    end
+  end
+
+  def prepare_incoming(_) do
+    :error
+  end
 end

lib/pleroma/web/activity_pub/activity_pub_controller.ex

@@ -20,7 +20,9 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubController do
 
   # TODO: Move signature failure halt into plug
   def inbox(%{assigns: %{valid_signature: true}} = conn, params) do
-    {:ok, activity} = ActivityPub.insert(params, false)
-    json(conn, "ok")
+    with {:ok, data} <- ActivityPub.prepare_incoming(params),
+         {:ok, activity} <- ActivityPub.insert(data, false) do
+      json(conn, "ok")
+    end
   end
 end