uBlock/src/js/resources/noeval.js

/*******************************************************************************

    uBlock Origin - a comprehensive, efficient content blocker
    Copyright (C) 2019-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 { proxyApplyFn } from './proxy-apply.js';
import { registerScriptlet } from './base.js';
import { safeSelf } from './safe-self.js';

/******************************************************************************/

function noEvalIf(
    needle = ''
) {
    if ( typeof needle !== 'string' ) { return; }
    const safe = safeSelf();
    const logPrefix = safe.makeLogPrefix('noeval-if', needle);
    const reNeedle = safe.patternToRegex(needle);
    proxyApplyFn('eval', function(context) {
        const { callArgs } = context;
        const a = String(callArgs[0]);
        if ( needle !== '' && reNeedle.test(a) ) {
            safe.uboLog(logPrefix, 'Prevented:\n', a);
            return;
        }
        if ( needle === '' || safe.logLevel > 1 ) {
            safe.uboLog(logPrefix, 'Not prevented:\n', a);
        }
        return context.reflect();
    });
}
registerScriptlet(noEvalIf, {
    name: 'noeval-if.js',
    aliases: [
        'prevent-eval-if.js',
    ],
    dependencies: [
        proxyApplyFn,
        safeSelf,
    ],
});