Merge branch 'tz-no-cdn-for-svg-sprites' into 'master'

Icon Sprite URL needs to be local even if asset_host is set

See merge request gitlab-org/gitlab-ce!15289

app/helpers/icons_helper.rb

@@ -23,10 +23,17 @@ module IconsHelper
     render "shared/icons/#{icon_name}.svg", size: size
   end
 
+  def sprite_icon_path
+    # SVG Sprites currently don't work across domains, so in the case of a CDN
+    # we have to set the current path deliberately to prevent addition of asset_host
+    sprite_base_url = Gitlab.config.gitlab.url if ActionController::Base.asset_host
+    ActionController::Base.helpers.image_path('icons.svg', host: sprite_base_url)
+  end
+
   def sprite_icon(icon_name, size: nil, css_class: nil)
     css_classes = size ? "s#{size}" : ""
     css_classes << " #{css_class}" unless css_class.blank?
-    content_tag(:svg, content_tag(:use, "", { "xlink:href" => "#{image_path('icons.svg')}##{icon_name}" } ), class: css_classes.empty? ? nil : css_classes)
+    content_tag(:svg, content_tag(:use, "", { "xlink:href" => "#{sprite_icon_path}##{icon_name}" } ), class: css_classes.empty? ? nil : css_classes)
   end
 
   def audit_icon(names, options = {})

lib/gitlab/gon_helper.rb

@@ -20,7 +20,7 @@ module Gitlab
       gon.gitlab_url             = Gitlab.config.gitlab.url
       gon.revision               = Gitlab::REVISION
       gon.gitlab_logo            = ActionController::Base.helpers.asset_path('gitlab_logo.png')
-      gon.sprite_icons           = ActionController::Base.helpers.asset_path('icons.svg')
+      gon.sprite_icons           = IconsHelper.sprite_icon_path
 
       if current_user
         gon.current_user_id = current_user.id

spec/helpers/icons_helper_spec.rb

 require 'spec_helper'
 
 describe IconsHelper do
+  let(:icons_path) { ActionController::Base.helpers.image_path("icons.svg") }
+
   describe 'icon' do
     it 'returns aria-hidden by default' do
       star = icon('star')
@@ -16,22 +18,42 @@ describe IconsHelper do
     end
   end
 
+  describe 'sprite_icon_path' do
+    it 'returns relative path' do
+      expect(sprite_icon_path)
+        .to eq icons_path
+    end
+
+    context 'when an asset_host is set in the config it will return an absolute local URL' do
+      let(:asset_host) { 'http://assets' }
+
+      before do
+        allow(ActionController::Base).to receive(:asset_host).and_return(asset_host)
+      end
+
+      it 'returns an absolute URL on that asset host' do
+        expect(sprite_icon_path)
+          .to eq ActionController::Base.helpers.image_path("icons.svg", host: Gitlab.config.gitlab.url)
+      end
+    end
+  end
+
   describe 'sprite_icon' do
     icon_name = 'clock'
 
     it 'returns svg icon html' do
       expect(sprite_icon(icon_name).to_s)
-        .to eq "<svg><use xlink:href=\"/images/icons.svg##{icon_name}\"></use></svg>"
+        .to eq "<svg><use xlink:href=\"#{icons_path}##{icon_name}\"></use></svg>"
     end
 
     it 'returns svg icon html + size classes' do
       expect(sprite_icon(icon_name, size: 72).to_s)
-        .to eq "<svg class=\"s72\"><use xlink:href=\"/images/icons.svg##{icon_name}\"></use></svg>"
+        .to eq "<svg class=\"s72\"><use xlink:href=\"#{icons_path}##{icon_name}\"></use></svg>"
     end
 
     it 'returns svg icon html + size classes + additional class' do
       expect(sprite_icon(icon_name, size: 72, css_class: 'icon-danger').to_s)
-        .to eq "<svg class=\"s72 icon-danger\"><use xlink:href=\"/images/icons.svg##{icon_name}\"></use></svg>"
+        .to eq "<svg class=\"s72 icon-danger\"><use xlink:href=\"#{icons_path}##{icon_name}\"></use></svg>"
     end
   end