Add `client_detection` helper to add browser and plaform flags

app/helpers/application_helper.rb

@@ -268,6 +268,17 @@ module ApplicationHelper
     _('You are on a read-only GitLab instance.')
   end
 
+  def client_class_list
+    "gl-browser-#{browser.id} gl-platform-#{browser.platform.id}"
+  end
+
+  def client_js_flags
+    {
+      "is#{browser.id.to_s.titlecase}": true,
+      "is#{browser.platform.id.to_s.titlecase}": true
+    }
+  end
+
   def autocomplete_data_sources(object, noteable_type)
     return {} unless object && noteable_type
 

spec/helpers/application_helper_spec.rb

@@ -168,6 +168,21 @@ describe ApplicationHelper do
     end
   end
 
+  describe '#client_class_list' do
+    it 'returns string containing CSS classes representing client browser and platform' do
+      class_list = helper.client_class_list
+      expect(class_list).to eq('gl-browser-generic gl-platform-other')
+    end
+  end
+
+  describe '#client_js_flags' do
+    it 'returns map containing JS flags representing client browser and platform' do
+      flags_list = helper.client_js_flags
+      expect(flags_list[:isGeneric]).to eq(true)
+      expect(flags_list[:isOther]).to eq(true)
+    end
+  end
+
   describe '#autocomplete_data_sources' do
     let(:project) { create(:project) }
     let(:noteable_type) { Issue }