Add config to use Rails for secure headers options (LG-5771)

config/initializers/secure_headers.rb

@@ -1,5 +1,17 @@
 require 'feature_management'
 
+if FeatureManagement.rails_csp_tooling_enabled?
+  Rails.application.configure do
+    config.ssl_options = { hsts: { preload: true, expires: 1.year, subdomains: true } }
+
+    config.action_dispatch.default_headers.merge!(
+      'X-Frame-Options' => 'DENY',
+      'X-XSS-Protection' => '1; mode=block',
+      'X-Download-Options' => 'noopen',
+    )
+  end
+end
+
 SecureHeaders::Configuration.default do |config| # rubocop:disable Metrics/BlockLength
   config.hsts = "max-age=#{365.days.to_i}; includeSubDomains; preload"
   config.x_frame_options = 'DENY'

spec/requests/headers_spec.rb

@@ -30,4 +30,25 @@
 
     expect(response.status).to eq 200
   end
+
+  context 'secure headers' do
+    it 'includes Strict-Transport-Security (HSTS)' do
+      get root_path, headers: { 'HTTPS' => 'on' }
+
+      expect(response.headers['Strict-Transport-Security']).
+        to eq('max-age=31536000; includeSubDomains; preload')
+    end
+
+    it 'sets the right values for X-headers' do
+      get root_path
+
+      aggregate_failures do
+        expect(response.headers['X-Frame-Options']).to eq('DENY')
+        expect(response.headers['X-Content-Type-Options']).to eq('nosniff')
+        expect(response.headers['X-XSS-Protection']).to eq('1; mode=block')
+        expect(response.headers['X-Download-Options']).to eq('noopen')
+        expect(response.headers['X-Permitted-Cross-Domain-Policies']).to eq('none')
+      end
+    end
+  end
 end