Upgrade Rails to version 5.2.0 (#5898)

config/initializers/content_security_policy.rb

@@ -0,0 +1,20 @@
+# Define an application-wide content security policy
+# For further information see the following documentation
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
+
+# Rails.application.config.content_security_policy do |p|
+#   p.default_src :self, :https
+#   p.font_src    :self, :https, :data
+#   p.img_src     :self, :https, :data
+#   p.object_src  :none
+#   p.script_src  :self, :https
+#   p.style_src   :self, :https, :unsafe_inline
+#
+#   # Specify URI for violation reports
+#   # p.report_uri "/csp-violation-report-endpoint"
+# end
+
+# Report CSP violations to a specified URI
+# For further information see the following documentation:
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
+# Rails.application.config.content_security_policy_report_only = true