Add customizable thumbnails for audio and video attachments (#14145)

- Change audio files to not be stripped of metadata
- Automatically extract cover art from audio if it exists
- Add `thumbnail` parameter to `POST /api/v1/media`, `POST /api/v2/media` and `PUT /api/v1/media/:id`
- Add `icon` to represent it in attachments in ActivityPub
- Fix `preview_url` containing URL of missing missing image when there is no thumbnail instead of null
- Fix duration of audio not being displayed on public pages until the file is loaded

2 files changed, 3 insertions, 2 deletions

diff --git a/app/workers/post_process_media_worker.rb b/app/workers/post_process_media_worker.rb
index 73f9ae2bf..a904f35b1 100644
--- a/app/workers/post_process_media_worker.rb
+++ b/app/workers/post_process_media_worker.rb
@@ -32,7 +32,7 @@ class PostProcessMediaWorker
 
     media_attachment.file.reprocess!(:original)
     media_attachment.processing = :complete
-    media_attachment.file_meta = previous_meta
+    media_attachment.file_meta = previous_meta.merge(media_attachment.file_meta).with_indifferent_access.slice(:focus, :original, :small)
     media_attachment.save
   rescue ActiveRecord::RecordNotFound
     true
diff --git a/app/workers/redownload_media_worker.rb b/app/workers/redownload_media_worker.rb
index 071501a49..0638cd0f0 100644
--- a/app/workers/redownload_media_worker.rb
+++ b/app/workers/redownload_media_worker.rb
@@ -11,7 +11,8 @@ class RedownloadMediaWorker
 
     return if media_attachment.remote_url.blank?
 
-    media_attachment.file_remote_url = media_attachment.remote_url
+    media_attachment.download_file!
+    media_attachment.download_thumbnail!
     media_attachment.save
   rescue ActiveRecord::RecordNotFound
     true