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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
Copyright (C) 2025-present 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/uBlock
*/
import { registerScriptlet } from './base.js';
import { safeSelf } from './safe-self.js';
/**
* @scriptlet prevent-innerHTML
*
* @description
* Conditionally prevent assignment to `innerHTML` property.
*
* @param [selector]
* Optional. The element must matches `selector` for the prevention to take
* place.
*
* @param [pattern]
* Optional. A pattern to match against the assigned value. The pattern can be
* a plain string, or a regex. Prepend with `!` to reverse the match condition.
*
* */
export function preventInnerHTML(
selector = '',
pattern = ''
) {
const safe = safeSelf();
const logPrefix = safe.makeLogPrefix('prevent-innerHTML', selector, pattern);
const matcher = safe.initPattern(pattern, { canNegate: true });
const current = safe.Object_getOwnPropertyDescriptor(Element.prototype, 'innerHTML');
if ( current === undefined ) { return; }
const shouldPreventSet = (elem, a) => {
if ( selector !== '' ) {
if ( typeof elem.matches !== 'function' ) { return false; }
if ( elem.matches(selector) === false ) { return false; }
}
return safe.testPattern(matcher, a);
};
Object.defineProperty(Element.prototype, 'innerHTML', {
get: function() {
return current.get
? current.get.call(this)
: current.value;
},
set: function(a) {
if ( shouldPreventSet(this, a) ) {
safe.uboLog(logPrefix, 'Prevented');
} else if ( current.set ) {
current.set.call(this, a);
}
if ( safe.logLevel > 1 ) {
safe.uboLog(logPrefix, `Assigned:\n${a}`);
}
current.value = a;
},
});
}
registerScriptlet(preventInnerHTML, {
name: 'prevent-innerHTML.js',
dependencies: [
safeSelf,
],
});
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