Restrict attachments to only uploaded files only

changelog.d/attachment-type-check.fix

@@ -0,0 +1 @@
+Restrict attachments to only uploaded files only

lib/pleroma/constants.ex

@@ -81,4 +81,6 @@ defmodule Pleroma.Constants do
   const(mime_regex,
     do: ~r/^[^[:cntrl:] ()<>@,;:\\"\/\[\]?=]+\/[^[:cntrl:] ()<>@,;:\\"\/\[\]?=]+(; .*)?$/
   )
+
+  const(upload_object_types, do: ["Document", "Image"])
 end

lib/pleroma/web/common_api/utils.ex

@@ -59,7 +59,12 @@ defmodule Pleroma.Web.CommonAPI.Utils do
   end
 
   defp get_attachment(media_id) do
-    Repo.get(Object, media_id)
+    with %Object{data: data} = object <- Repo.get(Object, media_id),
+         %{"type" => type} when type in Pleroma.Constants.upload_object_types() <- data do
+      object
+    else
+      _ -> nil
+    end
   end
 
   @spec get_to_and_cc(ActivityDraft.t()) :: {list(String.t()), list(String.t())}

test/pleroma/web/common_api/utils_test.exs

@@ -592,7 +592,7 @@ defmodule Pleroma.Web.CommonAPI.UtilsTest do
     end
 
     test "returns list attachments with desc" do
-      object = insert(:note)
+      object = insert(:attachment)
       desc = Jason.encode!(%{object.id => "test-desc"})
 
       assert Utils.attachments_from_ids_descs(["#{object.id}", "34"], desc) == [
@@ -603,7 +603,7 @@ defmodule Pleroma.Web.CommonAPI.UtilsTest do
 
   describe "attachments_from_ids/1" do
     test "returns attachments with descs" do
-      object = insert(:note)
+      object = insert(:attachment)
       desc = Jason.encode!(%{object.id => "test-desc"})
 
       assert Utils.attachments_from_ids(%{
@@ -615,13 +615,18 @@ defmodule Pleroma.Web.CommonAPI.UtilsTest do
     end
 
     test "returns attachments without descs" do
-      object = insert(:note)
+      object = insert(:attachment)
       assert Utils.attachments_from_ids(%{media_ids: ["#{object.id}"]}) == [object.data]
     end
 
     test "returns [] when not pass media_ids" do
       assert Utils.attachments_from_ids(%{}) == []
     end
+
+    test "checks that the object is of upload type" do
+      object = insert(:note)
+      assert Utils.attachments_from_ids(%{media_ids: ["#{object.id}"]}) == []
+    end
   end
 
   describe "maybe_add_list_data/3" do