From 727ee97a3f40f6b6d40546d1417f3a936692b755 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Sun, 17 Jun 2018 11:33:04 +0100
Subject: [PATCH] Allow inline javascript and CSS in better_errors pages

---
 .rubocop.yml                              |  1 +
 app/controllers/application_controller.rb | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/.rubocop.yml b/.rubocop.yml
index fc2b5cd85..e12437e08 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -9,6 +9,7 @@ Layout/ExtraSpacing:
 Lint/PercentStringArray:
   Exclude:
     - 'config/initializers/secure_headers.rb'
+    - 'app/controllers/application_controller.rb'
     - 'app/controllers/site_controller.rb'
 
 Naming/FileName:
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 3afb17f47..db4ae9ad3 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -4,6 +4,7 @@ class ApplicationController < ActionController::Base
   protect_from_forgery :with => :exception
 
   before_action :fetch_body
+  around_action :better_errors_allow_inline, :if => proc { Rails.env.development? }
 
   attr_accessor :current_user
   helper_method :current_user
@@ -455,6 +456,17 @@ class ApplicationController < ActionController::Base
     end
   end
 
+  def better_errors_allow_inline
+    yield
+  rescue StandardError
+    append_content_security_policy_directives(
+      :script_src => %w['unsafe-inline'],
+      :style_src => %w['unsafe-inline']
+    )
+
+    raise
+  end
+
   private
 
   # extract authorisation credentials from headers, returns user = nil if none
-- 
2.43.2