Merge branch 'dm-favicon-asset-host' into 'master'

Always serve favicon from main GitLab domain so that CI badge can be drawn over it

Closes #47802

See merge request gitlab-org/gitlab-ce!20263

changelogs/unreleased/dm-favicon-asset-host.yml

+---
+title: Always serve favicon from main GitLab domain so that CI badge can be drawn
+  over it
+merge_request:
+author:
+type: fixed

lib/banzai/pipeline/gfm_pipeline.rb

@@ -44,11 +44,7 @@ module Banzai
       def self.transform_context(context)
         context[:only_path] = true unless context.key?(:only_path)
 
-        context.merge(
-          # EmojiFilter
-          asset_host: Gitlab::Application.config.asset_host,
-          asset_root: Gitlab.config.gitlab.base_url
-        )
+        context
       end
     end
   end

lib/gitlab/favicon.rb

@@ -38,7 +38,8 @@ module Gitlab
       # we only want to create full urls when there's a different asset_host
       # configured.
       def host
-        if Gitlab::Application.config.asset_host.nil? || Gitlab::Application.config.asset_host == Gitlab.config.gitlab.base_url
+        asset_host = ActionController::Base.asset_host
+        if asset_host.nil? || asset_host == Gitlab.config.gitlab.base_url
           nil
         else
           Gitlab.config.gitlab.base_url

spec/lib/banzai/filter/emoji_filter_spec.rb

@@ -3,15 +3,6 @@ require 'spec_helper'
 describe Banzai::Filter::EmojiFilter do
   include FilterSpecHelper
 
-  before do
-    @original_asset_host = ActionController::Base.asset_host
-    ActionController::Base.asset_host = 'https://foo.com'
-  end
-
-  after do
-    ActionController::Base.asset_host = @original_asset_host
-  end
-
   it 'replaces supported name emoji' do
     doc = filter('<p>:heart:</p>')
     expect(doc.css('gl-emoji').first.text).to eq '❤'

spec/lib/gitlab/favicon_spec.rb

@@ -32,7 +32,7 @@ RSpec.describe Gitlab::Favicon, :request_store do
       end
 
       it 'returns a full url when the asset host is configured' do
-        allow(Gitlab::Application.config).to receive(:asset_host).and_return('http://assets.local')
+        allow(ActionController::Base).to receive(:asset_host).and_return('http://assets.local')
         expect(described_class.main).to match %r{^http://localhost/assets/favicon-(?:\h+).png$}
       end
     end