3 files changed, 17 insertions, 5 deletions
diff --git a/lib/pleroma/maps.ex b/lib/pleroma/maps.ex
index 6d586e53e..5020a8ff8 100644
--- a/lib/pleroma/maps.ex
+++ b/lib/pleroma/maps.ex
@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2024 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Maps do
@@ -18,4 +18,17 @@ defmodule Pleroma.Maps do
   rescue
     _ -> data
   end
+
+  def filter_empty_values(data) do
+    # TODO: Change to Map.filter in Elixir 1.13+
+    data
+    |> Enum.filter(fn
+      {_k, nil} -> false
+      {_k, ""} -> false
+      {_k, []} -> false
+      {_k, %{} = v} -> Map.keys(v) != []
+      {_k, _v} -> true
+    end)
+    |> Map.new()
+  end
 end
diff --git a/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex b/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex
index ab56ba468..4699029d4 100644
--- a/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex
+++ b/lib/pleroma/web/activity_pub/object_validators/common_fixes.ex
@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes do
   alias Pleroma.EctoType.ActivityPub.ObjectValidators
+  alias Pleroma.Maps
   alias Pleroma.Object
   alias Pleroma.Object.Containment
   alias Pleroma.User
@@ -24,6 +25,8 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.CommonFixes do
   end
 
   def fix_object_defaults(data) do
+    data = Maps.filter_empty_values(data)
+
     context =
       Utils.maybe_create_context(
         data["context"] || data["conversation"] || data["inReplyTo"] || data["id"]
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 69854b084..edfe73a25 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -336,10 +336,6 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier do
 
   def fix_tag(object), do: object
 
-  def fix_content_map(%{"contentMap" => nil} = object) do
-    Map.drop(object, ["contentMap"])
-  end
-
   # content map usually only has one language so this will do for now.
   def fix_content_map(%{"contentMap" => content_map} = object) do
     content_groups = Map.to_list(content_map)