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# frozen_string_literal: true
module ActionController #:nodoc:
# HTTP Feature Policy is a web standard for defining a mechanism to
# allow and deny the use of browser features in its own context, and
# in content within any <iframe> elements in the document.
#
# Full details of HTTP Feature Policy specification and guidelines can
# be found at MDN:
#
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy
#
# Examples of usage:
#
# # Global policy
# Rails.application.config.feature_policy do |f|
# f.camera :none
# f.gyroscope :none
# f.microphone :none
# f.usb :none
# f.fullscreen :self
# f.payment :self, "https://secure.example.com"
# end
#
# # Controller level policy
# class PagesController < ApplicationController
# feature_policy do |p|
# p.geolocation "https://example.com"
# end
# end
module FeaturePolicy
extend ActiveSupport::Concern
module ClassMethods
def feature_policy(**options, &block)
before_action(options) do
if block_given?
policy = request.feature_policy.clone
yield policy
request.feature_policy = policy
end
end
end
end
end
end
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