You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
62 lines
2.1 KiB
62 lines
2.1 KiB
/*******************************************************************************
|
|
|
|
uMatrix - a Chromium browser extension to black/white list requests.
|
|
Copyright (C) 2018 Raymond Hill
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see {http://www.gnu.org/licenses/}.
|
|
|
|
Home: https://github.com/gorhill/uMatrix
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
// The idea of using <meta http-equiv> to enforce CSP directive has been
|
|
// borrowed from NoScript:
|
|
// https://github.com/hackademix/noscript/commit/6e80d3f130773fc9a9123c5c4c2e97d63e90fa2a
|
|
|
|
(function() {
|
|
const html = document.documentElement;
|
|
if ( html instanceof HTMLElement === false ) { return; }
|
|
|
|
let meta;
|
|
try {
|
|
meta = document.createElement('meta');
|
|
} catch(ex) {
|
|
}
|
|
if ( meta === undefined ) { return; }
|
|
meta.setAttribute('http-equiv', 'content-security-policy');
|
|
meta.setAttribute('content', "script-src 'unsafe-eval' blob: *");
|
|
|
|
// https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-content-security-policy
|
|
//
|
|
// Only a head element can be parent:
|
|
// > If the meta element is not a child of a head element, return.
|
|
//
|
|
// The CSP directive is enforced as soon as the meta tag is inserted:
|
|
// > Enforce the policy policy.
|
|
const head = document.head;
|
|
let parent = head;
|
|
if ( parent === null ) {
|
|
parent = document.createElement('head');
|
|
html.appendChild(parent);
|
|
}
|
|
parent.appendChild(meta);
|
|
|
|
// Restore DOM to its original state.
|
|
if ( head === null ) {
|
|
html.removeChild(parent);
|
|
} else {
|
|
parent.removeChild(meta);
|
|
}
|
|
})();
|