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

app/controllers/api/v1/media_controller.rb

@@ -39,7 +39,7 @@ class Api::V1::MediaController < Api::BaseController
   end
 
   def media_attachment_params
-    params.permit(:file, :description, :focus)
+    params.permit(:file, :thumbnail, :description, :focus)
   end
 
   def file_type_error

app/controllers/media_proxy_controller.rb

@@ -28,8 +28,8 @@ class MediaProxyController < ApplicationController
   private
 
   def redownload!
-    @media_attachment.file_remote_url = @media_attachment.remote_url
-    @media_attachment.created_at      = Time.now.utc
+    @media_attachment.download_file!
+    @media_attachment.created_at = Time.now.utc
     @media_attachment.save!
   end
 

app/controllers/settings/pictures_controller.rb

@@ -7,13 +7,8 @@ module Settings
     before_action :set_picture
 
     def destroy
-      if valid_picture
-        account_params = {
-          @picture => nil,
-          (@picture + '_remote_url') => nil,
-        }
-
-        msg = UpdateAccountService.new.call(@account, account_params) ? I18n.t('generic.changes_saved_msg') : nil
+      if valid_picture?
+        msg = I18n.t('generic.changes_saved_msg') if UpdateAccountService.new.call(@account, { @picture => nil, "#{@picture}_remote_url" => '' })
         redirect_to settings_profile_path, notice: msg, status: 303
       else
         bad_request
@@ -30,8 +25,8 @@ module Settings
       @picture = params[:id]
     end
 
-    def valid_picture
-      @picture == 'avatar' || @picture == 'header'
+    def valid_picture?
+      %w(avatar header).include?(@picture)
     end
   end
 end