forked from adblockplus/adblockpluschrome
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathcomposer.postload.js
598 lines (511 loc) · 17.3 KB
/
composer.postload.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
/*
* This file is part of Adblock Plus <https://adblockplus.org/>,
* Copyright (C) 2006-present eyeo GmbH
*
* Adblock Plus is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Adblock Plus 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 Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
// We would rather export these properly and then require("include.preload")
// here, but that would result in include.preload running both at pre and post
// load.
const {checkCollapse, elemhide, getURLsFromElement, typeMap} = window;
// The page ID for the popup filter selection dialog (top frame only).
let blockelementPopupId = null;
// Element picking state (top frame only).
let currentlyPickingElement = false;
let lastMouseOverEvent = null;
// During element picking this is the currently highlighted element. When
// element has been picked this is the element that is due to be blocked.
let currentElement = null;
// Highlighting state, used by the top frame during element picking and all
// frames when the chosen element is highlighted red.
let highlightedElementsSelector = null;
let highlightedElementsInterval = null;
// Last right click state stored for element blocking via the context menu.
let lastRightClickEvent = null;
let lastRightClickEventIsMostRecent = false;
/* Utilities */
function getFiltersForElement(element, callback)
{
let src = element.getAttribute("src");
browser.runtime.sendMessage({
type: "composer.getFilters",
tagName: element.localName,
id: element.id,
src: src && src.length <= 1000 ? src : null,
style: element.getAttribute("style"),
classes: Array.prototype.slice.call(element.classList),
urls: getURLsFromElement(element),
mediatype: typeMap.get(element.localName),
baseURL: document.location.href
},
response =>
{
callback(response.filters, response.selectors);
});
}
function getBlockableElementOrAncestor(element, callback)
{
// We assume that the user doesn't want to block the whole page.
// So we never consider the <html> or <body> element.
while (element && element != document.documentElement &&
element != document.body)
{
// We can't handle non-HTML (like SVG) elements, as well as
// <area> elements (see below). So fall back to the parent element.
if (!(element instanceof HTMLElement) || element.localName == "area")
element = element.parentElement;
// If image maps are used mouse events occur for the <area> element.
// But we have to block the image associated with the <map> element.
else if (element.localName == "map")
{
let images = document.querySelectorAll("img[usemap]");
let image = null;
for (let currentImage of images)
{
let usemap = currentImage.getAttribute("usemap");
let index = usemap.indexOf("#");
if (index != -1 && usemap.substr(index + 1) == element.name)
{
image = currentImage;
break;
}
}
element = image;
}
// Finally, if none of the above is true, check whether we can generate
// any filters for this element. Otherwise fall back to its parent element.
else
{
getFiltersForElement(element, filters =>
{
if (filters.length > 0)
callback(element);
else
getBlockableElementOrAncestor(element.parentElement, callback);
});
return;
}
}
// We reached the document root without finding a blockable element.
callback(null);
}
/* Element highlighting */
// Adds an overlay to an element in order to highlight it.
function addElementOverlay(element)
{
let position = "absolute";
let offsetX = window.scrollX;
let offsetY = window.scrollY;
for (let e = element; e; e = e.parentElement)
{
let style = getComputedStyle(e);
// If the element isn't rendered (since its or one of its ancestor's
// "display" property is "none"), the overlay wouldn't match the element.
if (style.display == "none")
return null;
// If the element or one of its ancestors uses fixed postioning, the overlay
// must too. Otherwise its position might not match the element's.
if (style.position == "fixed")
{
position = "fixed";
offsetX = offsetY = 0;
}
}
let overlay = document.createElement("div");
overlay.prisoner = element;
overlay.className = "__adblockplus__overlay";
overlay.setAttribute("style",
"opacity:0.4; display:inline-block !important; " +
"overflow:hidden; box-sizing:border-box;");
let rect = element.getBoundingClientRect();
overlay.style.width = rect.width + "px";
overlay.style.height = rect.height + "px";
overlay.style.left = (rect.left + offsetX) + "px";
overlay.style.top = (rect.top + offsetY) + "px";
overlay.style.position = position;
overlay.style.zIndex = 0x7FFFFFFE;
document.documentElement.appendChild(overlay);
return overlay;
}
function highlightElement(element, shadowColor, backgroundColor)
{
unhighlightElement(element);
let highlightWithOverlay = () =>
{
let overlay = addElementOverlay(element);
// If the element isn't displayed no overlay will be added.
// Moreover, we don't need to highlight anything then.
if (!overlay)
return;
highlightElement(overlay, shadowColor, backgroundColor);
overlay.style.pointerEvents = "none";
element._unhighlight = () =>
{
overlay.parentNode.removeChild(overlay);
};
};
let highlightWithStyleAttribute = () =>
{
let originalBoxShadow = element.style.getPropertyValue("box-shadow");
let originalBoxShadowPriority =
element.style.getPropertyPriority("box-shadow");
let originalBackgroundColor =
element.style.getPropertyValue("background-color");
let originalBackgroundColorPriority =
element.style.getPropertyPriority("background-color");
element.style.setProperty("box-shadow", "inset 0px 0px 5px " + shadowColor,
"important");
element.style.setProperty("background-color", backgroundColor, "important");
element._unhighlight = () =>
{
element.style.removeProperty("box-shadow");
element.style.setProperty(
"box-shadow",
originalBoxShadow,
originalBoxShadowPriority
);
element.style.removeProperty("background-color");
element.style.setProperty(
"background-color",
originalBackgroundColor,
originalBackgroundColorPriority
);
};
};
// If this element is an overlay that we've created previously then we need
// to give it a background colour. Otherwise we need to create an overlay
// and then recurse in order to set the overlay's background colour.
if ("prisoner" in element)
highlightWithStyleAttribute();
else
highlightWithOverlay();
}
function unhighlightElement(element)
{
if (element && "_unhighlight" in element)
{
element._unhighlight();
delete element._unhighlight;
}
}
// Highlight elements matching the selector string red.
// (All elements that would be blocked by the proposed filters.)
function highlightElements(selectorString)
{
unhighlightElements();
let elements = Array.prototype.slice.call(
document.querySelectorAll(selectorString)
);
highlightedElementsSelector = selectorString;
// Highlight elements progressively. Otherwise the page freezes
// when a lot of elements get highlighted at the same time.
highlightedElementsInterval = setInterval(() =>
{
if (elements.length > 0)
{
let element = elements.shift();
if (element != currentElement)
highlightElement(element, "#fd6738", "#f6e1e5");
}
else
{
clearInterval(highlightedElementsInterval);
highlightedElementsInterval = null;
}
}, 0);
}
// Unhighlight the elements that were highlighted by selector string previously.
function unhighlightElements()
{
if (highlightedElementsInterval)
{
clearInterval(highlightedElementsInterval);
highlightedElementsInterval = null;
}
if (highlightedElementsSelector)
{
Array.prototype.forEach.call(
document.querySelectorAll(highlightedElementsSelector),
unhighlightElement
);
highlightedElementsSelector = null;
}
}
/* Input event handlers */
function stopEventPropagation(event)
{
event.stopPropagation();
}
// Hovering over an element so highlight it.
function mouseOver(event)
{
lastMouseOverEvent = event;
getBlockableElementOrAncestor(event.target, element =>
{
if (event == lastMouseOverEvent)
{
lastMouseOverEvent = null;
if (currentlyPickingElement)
{
if (currentElement)
unhighlightElement(currentElement);
if (element)
highlightElement(element, "#d6d84b", "#f8fa47");
currentElement = element;
}
}
});
event.stopPropagation();
}
// No longer hovering over this element so unhighlight it.
function mouseOut(event)
{
if (!currentlyPickingElement || currentElement != event.target)
return;
unhighlightElement(currentElement);
event.stopPropagation();
}
// Key events - Return selects currently hovered-over element, escape aborts.
function keyDown(event)
{
if (!event.ctrlKey && !event.altKey && !event.shiftKey)
{
if (event.keyCode == 13) // Return
elementPicked(event);
else if (event.keyCode == 27) // Escape
deactivateBlockElement();
}
}
/* Element selection */
// Start highlighting elements yellow as the mouse moves over them, when one is
// chosen launch the popup dialog for the user to confirm the generated filters.
function startPickingElement()
{
currentlyPickingElement = true;
// Add (currently invisible) overlays for blockable elements that don't emit
// mouse events, so that they can still be selected.
Array.prototype.forEach.call(
document.querySelectorAll("object,embed,iframe,frame"),
element =>
{
getFiltersForElement(element, filters =>
{
if (filters.length > 0)
addElementOverlay(element);
});
}
);
document.addEventListener("mousedown", stopEventPropagation, true);
document.addEventListener("mouseup", stopEventPropagation, true);
document.addEventListener("mouseenter", stopEventPropagation, true);
document.addEventListener("mouseleave", stopEventPropagation, true);
document.addEventListener("mouseover", mouseOver, true);
document.addEventListener("mouseout", mouseOut, true);
document.addEventListener("click", elementPicked, true);
document.addEventListener("contextmenu", elementPicked, true);
document.addEventListener("keydown", keyDown, true);
ext.onExtensionUnloaded.addListener(deactivateBlockElement);
}
// The user has picked an element - currentElement. Highlight it red, generate
// filters for it and open a popup dialog so that the user can confirm.
function elementPicked(event)
{
if (!currentElement)
return;
let element = currentElement.prisoner || currentElement;
getFiltersForElement(element, (filters, selectors) =>
{
if (currentlyPickingElement)
stopPickingElement();
browser.runtime.sendMessage({
type: "composer.openDialog"
},
popupId =>
{
browser.runtime.sendMessage({
type: "forward",
targetPageId: popupId,
payload: {type: "composer.dialog.init", filters}
});
// Only the top frame keeps a record of the popup window's ID,
// so if this isn't the top frame we need to pass the ID on.
if (window == window.top)
{
blockelementPopupId = popupId;
}
else
{
browser.runtime.sendMessage({
type: "forward",
payload: {type: "composer.content.dialogOpened", popupId}
});
}
});
if (selectors.length > 0)
highlightElements(selectors.join(","));
highlightElement(currentElement, "#fd1708", "#f6a1b5");
});
event.preventDefault();
event.stopPropagation();
}
function stopPickingElement()
{
currentlyPickingElement = false;
document.removeEventListener("mousedown", stopEventPropagation, true);
document.removeEventListener("mouseup", stopEventPropagation, true);
document.removeEventListener("mouseenter", stopEventPropagation, true);
document.removeEventListener("mouseleave", stopEventPropagation, true);
document.removeEventListener("mouseover", mouseOver, true);
document.removeEventListener("mouseout", mouseOut, true);
document.removeEventListener("click", elementPicked, true);
document.removeEventListener("contextmenu", elementPicked, true);
document.removeEventListener("keydown", keyDown, true);
}
/* Core logic */
// We're done with the block element feature for now, tidy everything up.
function deactivateBlockElement()
{
if (currentlyPickingElement)
stopPickingElement();
if (blockelementPopupId != null)
{
browser.runtime.sendMessage({
type: "forward",
targetPageId: blockelementPopupId,
payload:
{
type: "composer.dialog.close"
}
});
blockelementPopupId = null;
}
lastRightClickEvent = null;
if (currentElement)
{
unhighlightElement(currentElement);
currentElement = null;
}
unhighlightElements();
let overlays = document.getElementsByClassName("__adblockplus__overlay");
while (overlays.length > 0)
overlays[0].parentNode.removeChild(overlays[0]);
ext.onExtensionUnloaded.removeListener(deactivateBlockElement);
}
function initializeComposer()
{
if (typeof ext == "undefined")
return false;
// Use a contextmenu handler to save the last element the user right-clicked
// on. To make things easier, we actually save the DOM event. We have to do
// this because the contextMenu API only provides a URL, not the actual DOM
// element.
// We also need to make sure that the previous right click event,
// if there is one, is removed. We don't know which frame it is in so we must
// send a message to the other frames to clear their old right click events.
document.addEventListener("contextmenu", event =>
{
lastRightClickEvent = event;
lastRightClickEventIsMostRecent = true;
browser.runtime.sendMessage({
type: "forward",
payload:
{
type: "composer.content.clearPreviousRightClickEvent"
}
});
}, true);
ext.onMessage.addListener((message, sender, sendResponse) =>
{
switch (message.type)
{
case "composer.content.getState":
if (window == window.top)
{
sendResponse({
active: currentlyPickingElement || blockelementPopupId != null
});
}
break;
case "composer.content.startPickingElement":
if (window == window.top)
startPickingElement();
break;
case "composer.content.contextMenuClicked":
let event = lastRightClickEvent;
deactivateBlockElement();
if (event)
{
getBlockableElementOrAncestor(event.target, element =>
{
if (element)
{
currentElement = element;
elementPicked(event);
}
});
}
break;
case "composer.content.finished":
if (currentElement && message.remove)
{
// Hide the selected element itself if an added blocking
// filter is causing it to collapse. Note that this
// behavior is incomplete, but the best we can do here,
// e.g. if an added blocking filter matches other elements,
// the effect won't be visible until the page is is reloaded.
checkCollapse(currentElement.prisoner || currentElement);
// Apply added element hiding filters.
elemhide.apply();
}
deactivateBlockElement();
break;
case "composer.content.clearPreviousRightClickEvent":
if (!lastRightClickEventIsMostRecent)
lastRightClickEvent = null;
lastRightClickEventIsMostRecent = false;
break;
case "composer.content.dialogOpened":
if (window == window.top)
blockelementPopupId = message.popupId;
break;
case "composer.content.dialogClosed":
// The onRemoved hook for the popup can create a race condition, so we
// to be careful here. (This is not perfect, but best we can do.)
if (window == window.top && blockelementPopupId == message.popupId)
{
browser.runtime.sendMessage({
type: "forward",
payload:
{
type: "composer.content.finished"
}
});
}
break;
}
});
if (window == window.top)
browser.runtime.sendMessage({type: "composer.ready"});
return true;
}
if (document instanceof HTMLDocument)
{
// There's a bug in Firefox that causes document_end content scripts to run
// before document_start content scripts on extension startup. In this case
// the ext object is undefined, we fail to initialize, and initializeComposer
// returns false. As a workaround, try again after a timeout.
// https://bugzilla.mozilla.org/show_bug.cgi?id=1395287
if (!initializeComposer())
setTimeout(initializeComposer, 2000);
}