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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) 2006-2016 Eyeo GmbH | 3 * Copyright (C) 2006-2016 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 |
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 * GNU General Public License for more details. | 12 * GNU General Public License for more details. |
13 * | 13 * |
14 * You should have received a copy of the GNU General Public License | 14 * You should have received a copy of the GNU General Public License |
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>. | 15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>. |
16 */ | 16 */ |
17 | 17 |
18 var MutationObserver = window.MutationObserver || window.WebKitMutationObserver; | 18 var MutationObserver = window.MutationObserver || window.WebKitMutationObserver; |
19 var SELECTOR_GROUP_SIZE = 200; | 19 var SELECTOR_GROUP_SIZE = 200; |
20 var id = Math.random().toString(36).substr(2); | |
20 | 21 |
21 var typeMap = { | 22 var typeMap = { |
22 "img": "IMAGE", | 23 "img": "IMAGE", |
23 "input": "IMAGE", | 24 "input": "IMAGE", |
24 "picture": "IMAGE", | 25 "picture": "IMAGE", |
25 "audio": "MEDIA", | 26 "audio": "MEDIA", |
26 "video": "MEDIA", | 27 "video": "MEDIA", |
27 "frame": "SUBDOCUMENT", | 28 "frame": "SUBDOCUMENT", |
28 "iframe": "SUBDOCUMENT", | 29 "iframe": "SUBDOCUMENT", |
29 "object": "OBJECT", | 30 "object": "OBJECT", |
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342 var observer = new MutationObserver(function() | 343 var observer = new MutationObserver(function() |
343 { | 344 { |
344 if (style.parentNode != parentNode) | 345 if (style.parentNode != parentNode) |
345 parentNode.appendChild(style); | 346 parentNode.appendChild(style); |
346 }); | 347 }); |
347 | 348 |
348 observer.observe(parentNode, {childList: true}); | 349 observer.observe(parentNode, {childList: true}); |
349 return observer; | 350 return observer; |
350 } | 351 } |
351 | 352 |
353 function injectJS(f) | |
Sebastian Noack
2016/08/08 22:09:15
I just noticed that this function is redundant wit
kzar
2016/08/09 12:08:05
Done.
| |
354 { | |
355 var args = JSON.stringify(Array.prototype.slice.call(arguments, 1)); | |
356 args = args.substring(1, args.length - 1); | |
357 var codeString = "(" + f.toString() + ")(" + args + ");"; | |
358 | |
359 var script = document.createElement("script"); | |
360 script.async = false; | |
361 script.textContent = codeString; | |
362 document.documentElement.appendChild(script); | |
363 document.documentElement.removeChild(script); | |
364 } | |
365 | |
352 function protectStyleSheet(document, style) | 366 function protectStyleSheet(document, style) |
353 { | 367 { |
354 var id = Math.random().toString(36).substr(2) | |
355 style.id = id; | 368 style.id = id; |
356 | 369 |
357 var code = [ | 370 var protector = function(id) |
358 "(function()", | 371 { |
359 "{", | 372 var style = document.getElementById(id) || |
360 ' var style = document.getElementById("' + id + '") ||', | 373 document.documentElement.shadowRoot.getElementById(id); |
361 ' document.documentElement.shadowRoot.getElementById("' + id + '");', | 374 style.removeAttribute("id"); |
362 ' style.removeAttribute("id");' | |
363 ]; | |
364 | 375 |
365 var disableables = ["style", "style.sheet"]; | 376 var i; |
Sebastian Noack
2016/08/08 22:09:15
It seems that you don' reuse the variable i anymor
kzar
2016/08/09 12:08:05
Done.
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366 for (var i = 0; i < disableables.length; i++) | 377 var disableables = [style, style.sheet]; |
378 for (i = 0; i < disableables.length; i++) | |
379 Object.defineProperty(disableables[i], "disabled", | |
380 {value: false, enumerable: true}); | |
381 | |
382 var methods = ["deleteRule", "removeRule"]; | |
Sebastian Noack
2016/08/08 22:09:15
How about ["deleteRule", "removeRule"].forEach(),
kzar
2016/08/09 12:08:05
Done.
| |
383 methods.forEach(function(method) | |
384 { | |
385 var original = CSSStyleSheet.prototype[method]; | |
386 CSSStyleSheet.prototype[method] = function(index) | |
387 { | |
388 if (this != style.sheet) | |
389 original.call(this, index); | |
390 }; | |
391 }); | |
392 }; | |
393 | |
394 injectJS(protector, id); | |
395 } | |
396 | |
397 // Neither Chrome[1] nor Safari allow us to intercept WebSockets, and therefore | |
398 // some ad networks are misusing them as a way to serve adverts and circumvent | |
399 // us. As a workaround we wrap WebSocket, preventing blocked WebSocket | |
400 // connections from being opened. | |
401 // [1] - https://bugs.chromium.org/p/chromium/issues/detail?id=129353 | |
402 function wrapWebSocket() | |
403 { | |
404 if (typeof WebSocket == "undefined") | |
405 return; | |
406 | |
407 var eventName = "abpws-" + id; | |
408 | |
409 document.addEventListener(eventName, function(event) | |
367 { | 410 { |
368 code.push(" Object.defineProperty(" + disableables[i] + ', "disabled", ' | 411 ext.backgroundPage.sendMessage({ |
369 + "{value: false, enumerable: true});") ; | 412 type: "websocket-request", |
413 url: event.detail.url | |
414 }, function (block) | |
415 { | |
416 document.dispatchEvent( | |
417 new CustomEvent(eventName + "-" + event.detail.url, {detail: block}) | |
418 ); | |
419 }); | |
420 }); | |
421 | |
422 function wrapper(eventName) | |
423 { | |
424 // As far as possible we must track everything we use that could be | |
425 // sabotaged by the website later in order to circumvent us. | |
426 var RealWebSocket = WebSocket; | |
427 var closeWebSocket = RealWebSocket.prototype.close; | |
428 var addEventListener = document.addEventListener.bind(document); | |
429 var removeEventListener = document.removeEventListener.bind(document); | |
430 var dispatchEvent = document.dispatchEvent.bind(document); | |
431 var CustomEvent = window.CustomEvent; | |
432 var boundCall = Function.prototype.call.bind(Function.prototype.call); | |
433 var stringToString = String.prototype.toString; | |
434 // (These two functions are usually the same, but since Safari 9 considers | |
435 // WebSocket to be an object rather than a function we must track both.) | |
436 var functionToString = Function.prototype.toString; | |
437 var WebSocketString = RealWebSocket.toString(); | |
Sebastian Noack
2016/08/08 22:09:15
I suppose this variable should rather be lowercase
kzar
2016/08/09 12:08:05
Done.
| |
438 | |
439 function checkRequest(url, callback) | |
440 { | |
441 var incomingEventName = eventName + "-" + url; | |
442 function listener(event) | |
443 { | |
444 callback(event.detail); | |
445 removeEventListener(incomingEventName, listener); | |
446 } | |
447 addEventListener(incomingEventName, listener); | |
448 | |
449 dispatchEvent(new CustomEvent(eventName, { | |
450 detail: {url: url} | |
451 })); | |
452 } | |
453 | |
454 function wrappedToString() | |
455 { | |
456 if (this === WebSocket) | |
Sebastian Noack
2016/08/08 22:09:16
As per Mozilla's coding practices, we prefer == ov
kzar
2016/08/09 12:08:04
Sure but here we want to check that `this` points
Sebastian Noack
2016/08/09 14:53:29
I think, if none of the values has a primitive typ
kzar
2016/08/09 16:11:39
Well to tell you the truth I'm not 100% sure if ty
| |
457 return WebSocketString; | |
458 if (this === wrappedToString) | |
Sebastian Noack
2016/08/08 22:09:15
This special case is unneccessary if you simply as
kzar
2016/08/09 12:08:04
(I tried it out but found I would get the exceptio
Sebastian Noack
2016/08/09 14:53:29
Even better, why not just |WebSocket = function(..
kzar
2016/08/09 16:11:39
Well nice idea but then WebSocket.toString() gives
| |
459 return boundCall(functionToString, functionToString); | |
460 return boundCall(functionToString, this); | |
461 }; | |
462 Function.prototype.toString = wrappedToString; | |
463 | |
464 WebSocket = function(url, protocols) | |
465 { | |
466 // Ensure that `new WebSocket();` throws the correct exception | |
467 if (!url) | |
468 return new RealWebSocket(); | |
Sebastian Noack
2016/08/08 22:09:15
You still get a different error when null or undef
kzar
2016/08/09 12:08:05
Hmm good point and we can even just use `websocket
Sebastian Noack
2016/08/09 14:53:29
Even better, nice!
| |
469 | |
470 // First ensure url isn't a URL object, then make sure it's a real String. | |
471 // This is necessary to prevent circumvention, without breaking anything. | |
472 url = boundCall(stringToString, url.toString()); | |
Sebastian Noack
2016/08/08 22:09:15
8Why) do you have to call both, stringToString() a
| |
473 | |
474 var websocket = new RealWebSocket(url, protocols); | |
475 | |
476 checkRequest(url, function(blocked) | |
477 { | |
478 if (blocked) | |
479 boundCall(closeWebSocket, websocket); | |
480 }); | |
481 | |
482 return websocket; | |
483 }; | |
484 | |
485 var properties = Object.getOwnPropertyNames(RealWebSocket); | |
486 for (var i = 0; i < properties.length; i++) | |
487 { | |
488 var name = properties[i]; | |
489 var desc = Object.getOwnPropertyDescriptor(RealWebSocket, name); | |
490 Object.defineProperty(WebSocket, name, desc); | |
491 } | |
492 | |
493 RealWebSocket.prototype.constructor = WebSocket; | |
370 } | 494 } |
371 | 495 |
372 var methods = ["deleteRule", "removeRule"]; | 496 injectJS(wrapper, eventName); |
373 for (var j = 0; j < methods.length; j++) | |
374 { | |
375 var method = methods[j]; | |
376 if (method in CSSStyleSheet.prototype) | |
377 { | |
378 var origin = "CSSStyleSheet.prototype." + method; | |
379 code.push(" var " + method + " = " + origin + ";", | |
380 " " + origin + " = function(index)", | |
381 " {", | |
382 " if (this != style.sheet)", | |
383 " " + method + ".call(this, index);", | |
384 " }"); | |
385 } | |
386 } | |
387 | |
388 code.push("})();"); | |
389 | |
390 var script = document.createElement("script"); | |
391 script.async = false; | |
392 script.textContent = code.join("\n"); | |
393 document.documentElement.appendChild(script); | |
394 document.documentElement.removeChild(script); | |
395 } | 497 } |
396 | 498 |
397 function init(document) | 499 function init(document) |
398 { | 500 { |
399 var shadow = null; | 501 var shadow = null; |
400 var style = null; | 502 var style = null; |
401 var observer = null; | 503 var observer = null; |
402 var tracer = null; | 504 var tracer = null; |
403 | 505 |
506 wrapWebSocket(); | |
507 | |
404 function getPropertyFilters(callback) | 508 function getPropertyFilters(callback) |
405 { | 509 { |
406 ext.backgroundPage.sendMessage({ | 510 ext.backgroundPage.sendMessage({ |
407 type: "filters.get", | 511 type: "filters.get", |
408 what: "cssproperties" | 512 what: "cssproperties" |
409 }, callback); | 513 }, callback); |
410 } | 514 } |
411 var propertyFilters = new CSSPropertyFilters(window, getPropertyFilters, | 515 var propertyFilters = new CSSPropertyFilters(window, getPropertyFilters, |
412 addElemHideSelectors); | 516 addElemHideSelectors); |
413 | 517 |
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564 }, true); | 668 }, true); |
565 | 669 |
566 return updateStylesheet; | 670 return updateStylesheet; |
567 } | 671 } |
568 | 672 |
569 if (document instanceof HTMLDocument) | 673 if (document instanceof HTMLDocument) |
570 { | 674 { |
571 checkSitekey(); | 675 checkSitekey(); |
572 window.updateStylesheet = init(document); | 676 window.updateStylesheet = init(document); |
573 } | 677 } |
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