add download_remote_images_to_local site setting

app/jobs/regular/pull_hotlinked_images.rb

@@ -8,8 +8,7 @@ module Jobs
     end
 
     def execute(args)
-      # we don't want to run the job if we're not allowed to crawl images
-      return unless SiteSetting.crawl_images?
+      return unless SiteSetting.download_remote_images_to_local?
 
       post_id = args[:post_id]
       raise Discourse::InvalidParameters.new(:post_id) unless post_id.present?

config/locales/server.en.yml

@@ -500,6 +500,7 @@ en:
     company_domain: "The domain name owned by the company that runs this site, used in legal documents like the /tos"
     queue_jobs: "DEVELOPER ONLY! WARNING! By default, queue jobs in sidekiq. If disabled, your site will be broken."
     crawl_images: "Enable retrieving images from third party sources to insert width and height dimensions"
+    download_remote_images_to_local: "Download a copy of all remote images"
     ninja_edit_window: "Number of seconds after posting where edits do not create a new version"
     edit_history_visible_to_public: "Allow everyone to see previous versions of an edited post. When disabled, only staff members can view edit history."
     delete_removed_posts_after: "Number of hours after which posts removed by the author will be deleted."

config/site_settings.yml

@@ -249,6 +249,10 @@ files:
     default: false
   detect_custom_avatars: true
   max_daily_gravatar_crawls: 500
+  download_remote_images_to_local:
+    default:
+      test: false
+      default: true
 
 trust:
   default_trust_level: 0

lib/cooked_post_processor.rb

@@ -219,8 +219,8 @@ class CookedPostProcessor
   end
 
   def pull_hotlinked_images
-    # we don't want to run the job if we're not allowed to crawl images
-    return unless SiteSetting.crawl_images?
+    # is the job enabled?
+    return unless SiteSetting.download_remote_images_to_local?
     # we only want to run the job whenever it's changed by a user
     return if @post.updated_by == Discourse.system_user
     # make sure no other job is scheduled

spec/components/cooked_post_processor_spec.rb

@@ -275,15 +275,15 @@ describe CookedPostProcessor do
     let(:post) { build(:post) }
     let(:cpp) { CookedPostProcessor.new(post) }
 
-    it "does not run when crawl images is disabled" do
-      SiteSetting.stubs(:crawl_images).returns(false)
+    it "does not run when download_remote_images_to_local is disabled" do
+      SiteSetting.stubs(:download_remote_images_to_local).returns(false)
       Jobs.expects(:cancel_scheduled_job).never
       cpp.pull_hotlinked_images
     end
 
-    context "when crawl_images? is enabled" do
+    context "when download_remote_images_to_local? is enabled" do
 
-      before { SiteSetting.stubs(:crawl_images).returns(true) }
+      before { SiteSetting.stubs(:download_remote_images_to_local).returns(true) }
 
       it "runs only when a user updated the post" do
         post.updated_by = Discourse.system_user