Add DSL for configuring Content-Security-Policy header

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy

2 files changed, 27 insertions, 0 deletions

diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index b73269871b..204a3d400c 100644
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -225,6 +225,7 @@ module ActionController
       Flash,
       FormBuilder,
       RequestForgeryProtection,
+      ContentSecurityPolicy,
       ForceSSL,
       Streaming,
       DataStreaming,
diff --git a/actionpack/lib/action_controller/metal/content_security_policy.rb b/actionpack/lib/action_controller/metal/content_security_policy.rb
new file mode 100644
index 0000000000..48a7109bea
--- /dev/null
+++ b/actionpack/lib/action_controller/metal/content_security_policy.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+module ActionController #:nodoc:
+  module ContentSecurityPolicy
+    # TODO: Documentation
+    extend ActiveSupport::Concern
+
+    module ClassMethods
+      def content_security_policy(**options, &block)
+        before_action(options) do
+          if block_given?
+            policy = request.content_security_policy.clone
+            yield policy
+            request.content_security_policy = policy
+          end
+        end
+      end
+
+      def content_security_policy_report_only(report_only = true, **options)
+        before_action(options) do
+          request.content_security_policy_report_only = report_only
+        end
+      end
+    end
+  end
+end