[h2]content_security_policy[/h2]
Called to modify CSP settings prior to the output of the Content-Security-Policy header.
This hook permits addons to modify the content-security-policy if necessary to allow loading of foreign js libraries or css styles.
[code]
if(App::$config['system']['content_security_policy']) {
$cspsettings = Array (
'script-src' => Array ("'self'","'unsafe-inline'","'unsafe-eval'"),
'style-src' => Array ("'self'","'unsafe-inline'")
);
call_hooks('content_security_policy',$cspsettings);
// Legitimate CSP directives (cxref: https://content-security-policy.com/)
$validcspdirectives=Array(
"default-src", "script-src", "style-src",
"img-src", "connect-src", "font-src",
"object-src", "media-src", 'frame-src',
'sandbox', 'report-uri', 'child-src',
'form-action', 'frame-ancestors', 'plugin-types'
);
$cspheader = "Content-Security-Policy:";
foreach ($cspsettings as $cspdirective => $csp) {
if (!in_array($cspdirective,$validcspdirectives)) {
logger("INVALID CSP DIRECTIVE: ".$cspdirective,LOGGER_DEBUG);
continue;
}
$cspsettingsarray=array_unique($cspsettings[$cspdirective]);
$cspsetpolicy = implode(' ',$cspsettingsarray);
if ($cspsetpolicy) {
$cspheader .= " ".$cspdirective." ".$cspsetpolicy.";";
}
}
header($cspheader);
}
[/code]
see: boot.php
