app/controllers/media_proxy_controller.rb

   1 # frozen_string_literal: true
   2
   3 class MediaProxyController < ApplicationController
   4   include RoutingHelper
   5
   6   skip_before_action :store_current_location
   7   skip_before_action :require_functional!
   8
   9   before_action :authenticate_user!, if: :whitelist_mode?
  10
  11   rescue_from ActiveRecord::RecordInvalid, with: :not_found
  12   rescue_from Mastodon::UnexpectedResponseError, with: :not_found
  13   rescue_from HTTP::TimeoutError, HTTP::ConnectionError, OpenSSL::SSL::SSLError, with: :internal_server_error
  14
  15   def show
  16     RedisLock.acquire(lock_options) do |lock|
  17       if lock.acquired?
  18         @media_attachment = MediaAttachment.remote.find(params[:id])
  19         redownload! if @media_attachment.needs_redownload? && !reject_media?
  20       else
  21         raise Mastodon::RaceConditionError
  22       end
  23     end
  24
  25     redirect_to full_asset_url(@media_attachment.file.url(version))
  26   end
  27
  28   private
  29
  30   def redownload!
  31     @media_attachment.file_remote_url = @media_attachment.remote_url
  32     @media_attachment.created_at      = Time.now.utc
  33     @media_attachment.save!
  34   end
  35
  36   def version
  37     if request.path.ends_with?('/small')
  38       :small
  39     else
  40       :original
  41     end
  42   end
  43
  44   def lock_options
  45     { redis: Redis.current, key: "media_download:#{params[:id]}" }
  46   end
  47
  48   def reject_media?
  49     DomainBlock.reject_media?(@media_attachment.account.domain)
  50   end
  51 end