Strip actor from objects before federating

lib/pleroma/constants.ex

@@ -9,6 +9,7 @@ defmodule Pleroma.Constants do
 
   const(object_internal_fields,
     do: [
+      "actor",
       "reactions",
       "reaction_count",
       "likes",

test/fixtures/create-chat-message.json

@@ -1,10 +1,10 @@
 {
-  "actor": "http://2hu.gensokyo/users/raymoo",
+  "actor": "http://mastodon.example.org/users/admin",
-  "id": "http://2hu.gensokyo/objects/1",
+  "id": "http://mastodon.example.org/objects/1",
   "object": {
-    "attributedTo": "http://2hu.gensokyo/users/raymoo",
+    "attributedTo": "http://mastodon.example.org/users/admin",
     "content": "You expected a cute girl? Too bad. <script>alert('XSS')</script>",
-    "id": "http://2hu.gensokyo/objects/2",
+    "id": "http://mastodon.example.org/objects/2",
     "published": "2020-02-12T14:08:20Z",
     "to": [
       "http://2hu.gensokyo/users/marisa"

test/pleroma/user/backup_test.exs

@@ -221,7 +221,6 @@ defmodule Pleroma.User.BackupTest do
              "orderedItems" => [
                %{
                  "object" => %{
-                   "actor" => "http://cofe.io/users/cofe",
                    "content" => "status1",
                    "type" => "Note"
                  },
@@ -229,7 +228,6 @@ defmodule Pleroma.User.BackupTest do
                },
                %{
                  "object" => %{
-                   "actor" => "http://cofe.io/users/cofe",
                    "content" => "status2"
                  }
                },

test/pleroma/web/activity_pub/transmogrifier/chat_message_test.exs

@@ -116,8 +116,6 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier.ChatMessageTest do
       data =
         File.read!("test/fixtures/create-chat-message.json")
         |> Jason.decode!()
-        |> Map.put("actor", "http://mastodon.example.org/users/admin")
-        |> put_in(["object", "actor"], "http://mastodon.example.org/users/admin")
 
       _recipient = insert(:user, ap_id: List.first(data["to"]), local: true)
 

test/pleroma/web/activity_pub/transmogrifier_test.exs

@@ -169,7 +169,7 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       {:ok, modified} = Transmogrifier.prepare_outgoing(announce_activity.data)
 
       assert modified["object"]["content"] == "hey"
-      assert modified["object"]["actor"] == modified["object"]["attributedTo"]
+      assert activity.actor == modified["object"]["attributedTo"]
     end
 
     test "it turns mentions into tags" do
@@ -220,7 +220,7 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       {:ok, activity} = CommonAPI.post(user, %{status: "hey"})
       {:ok, modified} = Transmogrifier.prepare_outgoing(activity.data)
 
-      assert modified["object"]["actor"] == modified["object"]["attributedTo"]
+      assert activity.actor == modified["object"]["attributedTo"]
     end
 
     test "it strips internal hashtag data" do
@@ -266,6 +266,7 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
       assert is_nil(modified["object"]["announcements"])
       assert is_nil(modified["object"]["announcement_count"])
       assert is_nil(modified["object"]["generator"])
+      assert is_nil(modified["object"]["actor"])
     end
 
     test "it strips internal fields of article" do