From 47013a7126a92e1f2890b68e0fd2e7ba1b77c97c Mon Sep 17 00:00:00 2001
From: Yaroslav Markin <yaroslav@markin.net>
Date: Tue, 17 Apr 2018 18:05:12 +0300
Subject: Add the `nonce: true` option for `javascript_include_tag` helper.

---
 actionview/lib/action_view/helpers/asset_tag_helper.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'actionview/lib/action_view/helpers')

diff --git a/actionview/lib/action_view/helpers/asset_tag_helper.rb b/actionview/lib/action_view/helpers/asset_tag_helper.rb
index 06fa1875fc..257080d902 100644
--- a/actionview/lib/action_view/helpers/asset_tag_helper.rb
+++ b/actionview/lib/action_view/helpers/asset_tag_helper.rb
@@ -55,6 +55,8 @@ module ActionView
       #   that path.
       # * <tt>:skip_pipeline</tt>  - This option is used to bypass the asset pipeline
       #   when it is set to true.
+      # * <tt>:nonce<tt>  - When set to true, adds an automatic nonce value if
+      #   you have Content Security Policy enabled.
       #
       # ==== Examples
       #
@@ -79,6 +81,9 @@ module ActionView
       #
       #   javascript_include_tag "http://www.example.com/xmlhr.js"
       #   # => <script src="http://www.example.com/xmlhr.js"></script>
+      #
+      #   javascript_include_tag "http://www.example.com/xmlhr.js", nonce: true
+      #   # => <script src="http://www.example.com/xmlhr.js" nonce="..."></script>
       def javascript_include_tag(*sources)
         options = sources.extract_options!.stringify_keys
         path_options = options.extract!("protocol", "extname", "host", "skip_pipeline").symbolize_keys
@@ -90,6 +95,9 @@ module ActionView
           tag_options = {
             "src" => href
           }.merge!(options)
+          if tag_options["nonce"] == true
+            tag_options["nonce"] = content_security_policy_nonce
+          end
           content_tag("script".freeze, "", tag_options)
         }.join("\n").html_safe
 
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