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Issue 29886700: Issue 6969 - Implement abort-on-property-read snippet (Closed) Base URL: https://hg.adblockplus.org/adblockpluscore/
Patch Set: Revert to having one single property per call. Created Sept. 25, 2018, 3:38 p.m.
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1 /* 1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>, 2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-present eyeo GmbH 3 * Copyright (C) 2006-present eyeo GmbH
4 * 4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify 5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as 6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
8 * 8 *
9 * Adblock Plus is distributed in the hope that it will be useful, 9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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429 { 429 {
430 for (let i = 0; i < times; i++) 430 for (let i = 0; i < times; i++)
431 object + ""; 431 object + "";
432 432
433 if (typeof dir == "function") 433 if (typeof dir == "function")
434 dir.call(this, object); 434 dir.call(this, object);
435 }; 435 };
436 } 436 }
437 437
438 exports["dir-string"] = makeInjector(dirString); 438 exports["dir-string"] = makeInjector(dirString);
439
440 function randomId()
441 {
442 // 2176782336 is 36^6 which mean 6 chars [a-z0-9]
443 // 60466176 is 36^5
444 // 2176782336 - 60466176 = 2116316160. This ensure always 6 chars
445 // for when Math.random() returns 0.0
446 return Math.floor(Math.random() * 2116316160 + 60466176).toString(36);
447 }
448
449 /**
450 * Will patch a property on the window object to abort when read.
451 * It will intercept the onerror callback and block it if tagged.
452 *
453 * @todo handle properties of properties.
454 *
455 * @param {string} prop the name of the property.
456 */
457 function abortOnPropertyRead(prop)
458 {
459 if (!prop)
460 return;
461
462 let magic = randomId();
463
464 let abort = function()
465 {
466 throw new ReferenceError(magic);
467 };
468
469 let {onerror} = window;
470 window.onerror = (message, ...rest) =>
471 {
472 if (typeof message == "string" && message.includes(magic))
473 return true;
474 if (onerror && typeof onerro == "function")
475 return onerror(this, message, ...rest);
476 };
477
478 (function(o, p)
479 {
480 // simple property
481 let d = Object.getOwnPropertyDescriptor(o, p);
482 if (!d || d.get != abort)
483 Object.defineProperty(o, p, {get: abort, set() {}});
484 })(window, prop);
485 }
486
487 exports["abort-on-property-read"] = makeInjector(abortOnPropertyRead, randomId);
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