2 files changed, 16 insertions, 2 deletions
diff --git a/lib/pleroma/object/containment.ex b/lib/pleroma/object/containment.ex
index fb0398f92..040537acf 100644
--- a/lib/pleroma/object/containment.ex
+++ b/lib/pleroma/object/containment.ex
@@ -71,6 +71,14 @@ defmodule Pleroma.Object.Containment do
     compare_uris(id_uri, other_uri)
   end
 
+  # Mastodon pin activities don't have an id, so we check the object field, which will be pinned.
+  def contain_origin_from_id(id, %{"object" => object}) when is_binary(object) do
+    id_uri = URI.parse(id)
+    object_uri = URI.parse(object)
+
+    compare_uris(id_uri, object_uri)
+  end
+
   def contain_origin_from_id(_id, _data), do: :error
 
   def contain_child(%{"object" => %{"id" => id, "attributedTo" => _} = object}),
diff --git a/lib/pleroma/object/fetcher.ex b/lib/pleroma/object/fetcher.ex
index bcccf1c4c..4ca67f0fd 100644
--- a/lib/pleroma/object/fetcher.ex
+++ b/lib/pleroma/object/fetcher.ex
@@ -4,6 +4,7 @@
 
 defmodule Pleroma.Object.Fetcher do
   alias Pleroma.HTTP
+  alias Pleroma.Maps
   alias Pleroma.Object
   alias Pleroma.Object.Containment
   alias Pleroma.Repo
@@ -101,6 +102,9 @@ defmodule Pleroma.Object.Fetcher do
       {:transmogrifier, {:error, {:reject, e}}} ->
         {:reject, e}
 
+      {:transmogrifier, {:reject, e}} ->
+        {:reject, e}
+
       {:transmogrifier, _} = e ->
         {:error, e}
 
@@ -124,12 +128,14 @@ defmodule Pleroma.Object.Fetcher do
   defp prepare_activity_params(data) do
     %{
       "type" => "Create",
-      "to" => data["to"] || [],
-      "cc" => data["cc"] || [],
       # Should we seriously keep this attributedTo thing?
       "actor" => data["actor"] || data["attributedTo"],
       "object" => data
     }
+    |> Maps.put_if_present("to", data["to"])
+    |> Maps.put_if_present("cc", data["cc"])
+    |> Maps.put_if_present("bto", data["bto"])
+    |> Maps.put_if_present("bcc", data["bcc"])
   end
 
   def fetch_object_from_id!(id, options \\ []) do