Change local media attachments to perform heavy processing asynchronously (#13210)

Fix #9106

config/application.rb

@@ -7,6 +7,7 @@ require 'rails/all'
 Bundler.require(*Rails.groups)
 
 require_relative '../app/lib/exceptions'
+require_relative '../lib/paperclip/attachment_extensions'
 require_relative '../lib/paperclip/lazy_thumbnail'
 require_relative '../lib/paperclip/gif_transcoder'
 require_relative '../lib/paperclip/video_transcoder'

config/locales/en.yml

@@ -853,6 +853,7 @@ en:
   media_attachments:
     validations:
       images_and_video: Cannot attach a video to a status that already contains images
+      not_ready: Cannot attach files that have not finished processing. Try again in a moment!
       too_many: Cannot attach more than 4 files
   migrations:
     acct: Moved to

config/routes.rb

@@ -343,7 +343,7 @@ Rails.application.routes.draw do
         end
       end
 
-      resources :media,        only: [:create, :update]
+      resources :media,        only: [:create, :update, :show]
       resources :blocks,       only: [:index]
       resources :mutes,        only: [:index]
       resources :favourites,   only: [:index]
@@ -455,6 +455,7 @@ Rails.application.routes.draw do
     end
 
     namespace :v2 do
+      resources :media, only: [:create]
       get '/search', to: 'search#index', as: :search
     end