From 31f90bbb52db472f45d38aa90fc1bae43b65d7ff Mon Sep 17 00:00:00 2001
From: Oneric <oneric@oneric.stub>
Date: Tue, 26 Mar 2024 15:44:44 -0100
Subject: [PATCH] Register APNG MIME type
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The newest git HEAD of MIME already knows about APNG, but this
hasn’t been released yet. Without this, APNG attachments from
remote posts won’t display as images in frontends.

Fixes: akkoma#657
---
 config/config.exs                               |  5 ++++-
 .../attachment_validator_test.exs               | 17 +++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/config/config.exs b/config/config.exs
index 85a84208c..e0a5eccb1 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -167,7 +167,10 @@
   "application/xrd+xml" => ["xrd+xml"],
   "application/jrd+json" => ["jrd+json"],
   "application/activity+json" => ["activity+json"],
-  "application/ld+json" => ["activity+json"]
+  "application/ld+json" => ["activity+json"],
+  # Can be removed when bumping MIME past 2.0.5
+  # see https://akkoma.dev/AkkomaGang/akkoma/issues/657
+  "image/apng" => ["apng"]
 }
 
 config :mime, :extensions, %{
diff --git a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
index 9150b8d41..f8dec09d3 100644
--- a/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
+++ b/test/pleroma/web/activity_pub/object_validators/attachment_validator_test.exs
@@ -11,6 +11,23 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidatorTest do
   import Pleroma.Factory
 
   describe "attachments" do
+    test "works with apng" do
+      attachment =
+        %{
+          "mediaType" => "image/apng",
+          "name" => "",
+          "type" => "Document",
+          "url" =>
+            "https://media.misskeyusercontent.com/io/2859c26e-cd43-4550-848b-b6243bc3fe28.apng"
+        }
+
+      assert {:ok, attachment} =
+               AttachmentValidator.cast_and_validate(attachment)
+               |> Ecto.Changeset.apply_action(:insert)
+
+      assert attachment.mediaType == "image/apng"
+    end
+
     test "works with honkerific attachments" do
       attachment = %{
         "mediaType" => "",