FIX: Handle img src starting with "//" in pull_hotlinked_images job

app/jobs/regular/pull_hotlinked_images.rb

@@ -26,7 +26,7 @@ module Jobs
       downloaded_urls = {}
 
       extract_images_from(post.cooked).each do |image|
-        src = image['src']
+        src = original_src = image['src']
         src = "http:" + src if src.start_with?("//")
 
         if is_valid_image_url(src)
@@ -53,7 +53,7 @@ module Jobs
             # have we successfully downloaded that file?
             if downloaded_urls[src].present?
               url = downloaded_urls[src]
-              escaped_src = Regexp.escape(src)
+              escaped_src = Regexp.escape(original_src)
               # there are 6 ways to insert an image in a post
               # HTML tag - <img src="http://...">
               raw.gsub!(/src=["']#{escaped_src}["']/i, "src='#{url}'")

spec/jobs/pull_hotlinked_images_spec.rb

@@ -0,0 +1,28 @@
+require 'rails_helper'
+require 'jobs/regular/pull_hotlinked_images'
+
+describe Jobs::PullHotlinkedImages do
+
+  png = Base64.decode64("R0lGODlhAQABALMAAAAAAIAAAACAAICAAAAAgIAAgACAgMDAwICAgP8AAAD/AP//AAAA//8A/wD//wBiZCH5BAEAAA8ALAAAAAABAAEAAAQC8EUAOw==")
+  FakeWeb.register_uri(:get, "http://wiki.mozilla.org/images/2/2e/Longcat1.png", body: png)
+  SiteSetting.download_remote_images_to_local = true
+
+  it 'replaces image src' do
+    post = Fabricate(:post, raw: "<img src='http://wiki.mozilla.org/images/2/2e/Longcat1.png'>")
+
+    Jobs::PullHotlinkedImages.new.execute(post_id: post.id)
+    post.reload
+
+    expect(post.raw).to match(/^<img src='\/uploads/)
+  end
+
+  it 'replaces image src without protocol' do
+    post = Fabricate(:post, raw: "<img src='//wiki.mozilla.org/images/2/2e/Longcat1.png'>")
+
+    Jobs::PullHotlinkedImages.new.execute(post_id: post.id)
+    post.reload
+
+    expect(post.raw).to match(/^<img src='\/uploads/)
+  end
+
+end