From 9b1f2a4b61660f9a8be62f6296d97a856e376059 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Fri, 6 Nov 2020 11:56:31 +0100
Subject: Add subresource integrity for JS and CSS assets (#15096)

Fix #2744
---
 lib/webpacker/helper_extensions.rb   | 20 ++++++++++++++++++++
 lib/webpacker/manifest_extensions.rb | 17 +++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 lib/webpacker/helper_extensions.rb
 create mode 100644 lib/webpacker/manifest_extensions.rb

(limited to 'lib')

diff --git a/lib/webpacker/helper_extensions.rb b/lib/webpacker/helper_extensions.rb
new file mode 100644
index 000000000..8f46d7631
--- /dev/null
+++ b/lib/webpacker/helper_extensions.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+module Webpacker::HelperExtensions
+  def javascript_pack_tag(name, **options)
+    src, integrity = current_webpacker_instance.manifest.lookup!(name, type: :javascript, with_integrity: true)
+    javascript_include_tag(src, options.merge(integrity: integrity))
+  end
+
+  def stylesheet_pack_tag(name, **options)
+    src, integrity = current_webpacker_instance.manifest.lookup!(name, type: :stylesheet, with_integrity: true)
+    stylesheet_link_tag(src, options.merge(integrity: integrity))
+  end
+
+  def preload_pack_asset(name, **options)
+    src, integrity = current_webpacker_instance.manifest.lookup!(name, with_integrity: true)
+    preload_link_tag(src, options.merge(integrity: integrity))
+  end
+end
+
+Webpacker::Helper.prepend(Webpacker::HelperExtensions)
diff --git a/lib/webpacker/manifest_extensions.rb b/lib/webpacker/manifest_extensions.rb
new file mode 100644
index 000000000..789eb81cc
--- /dev/null
+++ b/lib/webpacker/manifest_extensions.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module Webpacker::ManifestExtensions
+  def lookup(name, pack_type = {})
+    asset = super
+
+    if pack_type[:with_integrity] && asset.respond_to?(:dig)
+      [asset.dig('src'), asset.dig('integrity')]
+    elsif asset.respond_to?(:dig)
+      asset.dig('src')
+    else
+      asset
+    end
+  end
+end
+
+Webpacker::Manifest.prepend(Webpacker::ManifestExtensions)
-- 
cgit