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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,
+ ],
+});