app/Config/ContentSecurityPolicy.php
<?php namespace Config;

use CodeIgniter\Config\BaseConfig;

/**
 * Class ContentSecurityPolicyConfig
 *
 * Stores the default settings for the ContentSecurityPolicy, if you
 * choose to use it. The values here will be read in and set as defaults
 * for the site. If needed, they can be overridden on a page-by-page basis.
 *
 * Suggested reference for explanations:
 *    https://www.html5rocks.com/en/tutorials/security/content-security-policy/
 *
 * @package Config
 */
class ContentSecurityPolicy extends BaseConfig
{
	// broadbrush CSP management

	public $reportOnly              = false; // default CSP report context
	public $reportURI               = null; // URL to send violation reports to
	public $upgradeInsecureRequests = false; // toggle for forcing https

	// sources allowed; string or array of strings
	// Note: once you set a policy to 'none', it cannot be further restricted

	public $defaultSrc     = null; // will default to self if not over-ridden
	public $scriptSrc      = 'self';
	public $styleSrc       = 'self';
	public $imageSrc       = 'self';
	public $baseURI        = null;    // will default to self if not over-ridden
	public $childSrc       = 'self';
	public $connectSrc     = 'self';
	public $fontSrc        = null;
	public $formAction     = 'self';
	public $frameAncestors = null;
	public $mediaSrc       = null;
	public $objectSrc      = 'self';
	public $manifestSrc    = null;

	// mime types allowed; string or array of strings
	public $pluginTypes = null;

	// list of actions allowed; string or array of strings
	public $sandbox = null;

}
