├── LICENSE.txt
├── README.md
└── chromium-websocket-wrapper.js
/LICENSE.txt:
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1 | GNU GENERAL PUBLIC LICENSE
2 | Version 3, 29 June 2007
3 |
4 | Copyright (C) 2007 Free Software Foundation, Inc. {http://fsf.org/}
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584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 | {one line to give the program's name and a brief idea of what it does.}
635 | Copyright (C) {year} {name of author}
636 |
637 | This program is free software: you can redistribute it and/or modify
638 | it under the terms of the GNU General Public License as published by
639 | the Free Software Foundation, either version 3 of the License, or
640 | (at your option) any later version.
641 |
642 | This program is distributed in the hope that it will be useful,
643 | but WITHOUT ANY WARRANTY; without even the implied warranty of
644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 | GNU General Public License for more details.
646 |
647 | You should have received a copy of the GNU General Public License
648 | along with this program. If not, see {http://www.gnu.org/licenses/}.
649 |
650 | Also add information on how to contact you by electronic and paper mail.
651 |
652 | If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 |
655 | {{project}} Copyright (C) {{year}} {{fullname}}
656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 | This is free software, and you are welcome to redistribute it
658 | under certain conditions; type `show c' for details.
659 |
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License. Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 |
664 | You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | {http://www.gnu.org/licenses/}.
668 |
669 | The GNU General Public License does not permit incorporating your program
670 | into proprietary programs. If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library. If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License. But first, please read
674 | {http://www.gnu.org/philosophy/why-not-lgpl.html}.
675 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # chromium-websocket-wrapper
2 |
3 | As dicussed [here](https://github.com/AdguardTeam/AdguardBrowserExtension/issues/203).
4 |
5 | Pull requests welcomed.
6 |
--------------------------------------------------------------------------------
/chromium-websocket-wrapper.js:
--------------------------------------------------------------------------------
1 | /*******************************************************************************
2 |
3 | Chromium-websocket-wrapper - to reveal WebSocket connection attempts to
4 | chrome.webRequest API.
5 | Copyright (C) 2016 The Chromium-websocket-wrapper authors.
6 |
7 | This program is free software: you can redistribute it and/or modify
8 | it under the terms of the GNU General Public License as published by
9 | the Free Software Foundation, either version 3 of the License, or
10 | (at your option) any later version.
11 |
12 | This program is distributed in the hope that it will be useful,
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 | GNU General Public License for more details.
16 |
17 | You should have received a copy of the GNU General Public License
18 | along with this program. If not, see {http://www.gnu.org/licenses/}.
19 |
20 | Home: https://github.com/gorhill/chromium-websocket-wrapper
21 | */
22 | (function() {
23 | 'use strict';
24 |
25 | /**
26 | * Sends a message to the content-script to check if WebSocket should be allowed or not.
27 | *
28 | * How to use this channel:
29 | * 1. Pass it to WebSocket wrapper implementation (see below).
30 | * 2. Handle this message in your content script with a script like that:
31 | *
32 | * function pageMessageListener(event) {
33 | * // Make sure that this event is for us
34 | * if (!event.data || !event.data.direction || event.data.direction != "from-page-script@websocket-blocker") {
35 | * return;
36 | * }
37 | *
38 | * // TBD: Handle page message
39 | * var block = ...;
40 | * // Send response message
41 | * var message = {
42 | * direction: 'to-page-script@websocket-blocker',
43 | * requestId: event.data.requestId,
44 | * block: block
45 | * };
46 | * event.source.postMessage(message, event.origin);
47 | * }
48 | * // Start listening for messages from the page
49 | * window.addEventListener("message", pageMessageListener, false);
50 | *
51 | */
52 | var messageChannel = (function() {
53 | // NOTE: Don't forget to change these names in your extension
54 | var DIRECTION_OUT = "to-page-script@websocket-blocker";
55 | var DIRECTION_IN = "from-page-script@websocket-blocker";
56 |
57 | // Save original postMessage and addEventListener functions to prevent webpage from tampering both.
58 | var postMessage = window.postMessage;
59 | var addEventListener = window.addEventListener;
60 |
61 | // Current request ID (incremented every time we send a new message)
62 | var currentRequestId = 0;
63 | var requestsMap = {};
64 |
65 | /**
66 | * Handles messages sent from the content script back to the page script.
67 | *
68 | * @param event Event with necessary data
69 | */
70 | var onMessageReceived = function(event) {
71 |
72 | if (!event.data || !event.data.direction || event.data.direction != DIRECTION_OUT) {
73 | return;
74 | }
75 |
76 | var requestData = requestsMap[event.data.requestId];
77 | if (requestData) {
78 | var wrapper = requestData.wrapper;
79 | requestData.onResponseReceived(wrapper, event.data.block);
80 | delete requestsMap[event.data.requestId];
81 | }
82 | };
83 |
84 | /**
85 | * @param url The URL to which WS is willing to connect
86 | * @param wrapper WebSocket wrapper instance
87 | * @param onResponseReceived Called when response is received
88 | */
89 | var sendMessage = function(url, wrapper, onResponseReceived) {
90 |
91 | if (currentRequestId === 0) {
92 | // Subscribe to response when this method is called for the first time
93 | addEventListener.call(window, "message", onMessageReceived, false);
94 | }
95 |
96 | var requestId = ++currentRequestId;
97 | var requestData = {
98 | wrapper: wrapper,
99 | onResponseReceived: onResponseReceived
100 | };
101 | requestsMap[requestId] = requestData;
102 |
103 | var message = {
104 | requestId: requestId,
105 | direction: DIRECTION_IN,
106 | elementUrl: url,
107 | documentUrl: document.URL
108 | };
109 |
110 | // Send a message to the background page to check if the request should be blocked
111 | postMessage.call(window, message, "*");
112 | };
113 |
114 | return {
115 | sendMessage: sendMessage
116 | };
117 | })();
118 |
119 | /**
120 | * In order to check if WS should be allowed or not we create an image and pass WS url as a parameter.
121 | * If request for that image is successful we allow WS connection as well.
122 | */
123 | var imageChannel = (function() {
124 | // Save original Image function to prevent webpage from tampering it.
125 | var Image = window.Image;
126 |
127 | /**
128 | * @param url The URL to which WS is willing to connect
129 | * @param wrapper WebSocket wrapper
130 | * @param onResponseReceived Called when response is received
131 | */
132 | var sendMessage = function(url, wrapper, onResponseReceived) {
133 |
134 | var img = new Image();
135 | img.onload = onResponseReceived.bind(img, wrapper, false);
136 | img.onerror = onResponseReceived.bind(img, wrapper, true);
137 | img.src = window.location.origin + '?url=' + encodeURIComponent(url) + '&ubofix=f41665f3028c7fd10eecf573336216d3';
138 | };
139 |
140 | return {
141 | sendMessage: sendMessage
142 | };
143 | })();
144 |
145 | /**
146 | * WebSocket wrapper.
147 | *
148 | * @param channel Messaging channel (either imageChannel or messageChannel)
149 | */
150 | (function(channel) {
151 | var Wrapped = window.WebSocket;
152 | var map = new WeakMap();
153 |
154 | /**
155 | * Called when we got response from an extension.
156 | * Depending on the "blockConnection" parameter we either create a real WS or call onerror.
157 | *
158 | * @param wrapper WebSocket wrapper object
159 | * @param blockConnection true if connection should be blocked
160 | */
161 | var channelResponseReceived = function (wrapper, blockConnection) {
162 |
163 | var bag = map.get(wrapper);
164 | if (blockConnection) {
165 | if (bag.properties.onerror) {
166 | bag.properties.onerror(new window.ErrorEvent('error'));
167 | }
168 | bag.properties.readyState = WebSocket.CLOSED;
169 | return;
170 | }
171 |
172 | var wrapped = null;
173 | try {
174 | wrapped = new Wrapped(bag.args.url, bag.args.protocols);
175 | } catch (ex) {
176 | console.error(ex);
177 | }
178 |
179 | if (wrapped === null) {
180 | return;
181 | }
182 |
183 | for (var p in bag.properties) { // jshint ignore:line
184 | wrapped[p] = bag.properties[p];
185 | }
186 |
187 | for (var i = 0, l; i < bag.listeners.length; i++) {
188 | l = bag.listeners[i];
189 | wrapped.addEventListener(l.ev, l.cb, l.fl);
190 | }
191 |
192 | map.set(wrapper, wrapped);
193 | };
194 |
195 | /**
196 | * Dummy function
197 | */
198 | var emptyFunction = function () {};
199 |
200 | /**
201 | * Gets a value of the specified property from the wrapped websocket if it is already created.
202 | *
203 | * @param wrapper Wrapper instance
204 | * @param prop Property name
205 | * @param defaultValue Default value to be returned if real WS does not yet exist
206 | * @returns {*}
207 | */
208 | var getWrappedProperty = function (wrapper, prop, defaultValue) {
209 | var wrapped = map.get(wrapper);
210 | if (!wrapped) {
211 | return defaultValue;
212 | }
213 |
214 | if (wrapped instanceof Wrapped) {
215 | return wrapped[prop];
216 | }
217 |
218 | return wrapped.properties.hasOwnProperty(prop) ?
219 | wrapped.properties[prop] :
220 | defaultValue;
221 | };
222 |
223 | /**
224 | * Sets a value of the specified property.
225 | *
226 | * @param wrapper Wrapper instance
227 | * @param prop Property name
228 | * @param value Value to set
229 | */
230 | var setWrappedProperty = function (wrapper, prop, value) {
231 | if (value instanceof Function) {
232 | value = value.bind(wrapper);
233 | }
234 |
235 | var wrapped = map.get(wrapper);
236 | if (!wrapped) {
237 | return;
238 | }
239 |
240 | if (wrapped instanceof Wrapped) {
241 | wrapped[prop] = value;
242 | } else {
243 | wrapped.properties[prop] = value;
244 | }
245 | };
246 |
247 | /**
248 | * Fake websocket constructor.
249 | * https://developer.mozilla.org/en-US/docs/Web/API/WebSocket
250 | *
251 | * Original websocket opens a connection to a specified url. This wrapper works in a
252 | * different way, it first checks if this WS connection should be blocked or not.
253 | *
254 | * @param url The URL to which to connect
255 | * @param protocols Either a single protocol string or an array of protocol strings
256 | * @constructor
257 | */
258 | var WebSocket = function (url, protocols) {
259 | 'native';
260 | if (window.location.protocol === 'https:' &&
261 | url.lastIndexOf('ws:', 0) === 0) {
262 | // Just in case, plain text WS cannot be used on HTTPS webpages.
263 | // So we just trigger an exception.
264 | var ws = new Wrapped(url, protocols);
265 | if (ws) {
266 | ws.close();
267 | }
268 | }
269 |
270 | Object.defineProperties(this, {
271 | 'binaryType': {
272 | get: function () {
273 | return getWrappedProperty(this, 'binaryType', 'blob');
274 | },
275 | set: function (value) {
276 | setWrappedProperty(this, 'binaryType', value);
277 | }
278 | },
279 | 'bufferedAmount': {
280 | get: function () {
281 | return getWrappedProperty(this, 'bufferedAmount', 0);
282 | },
283 | set: emptyFunction
284 | },
285 | 'extensions': {
286 | get: function () {
287 | return getWrappedProperty(this, 'extensions', '');
288 | },
289 | set: emptyFunction
290 | },
291 | 'onclose': {
292 | get: function () {
293 | return getWrappedProperty(this, 'onclose', null);
294 | },
295 | set: function (value) {
296 | setWrappedProperty(this, 'onclose', value);
297 | }
298 | },
299 | 'onerror': {
300 | get: function () {
301 | return getWrappedProperty(this, 'onerror', null);
302 | },
303 | set: function (value) {
304 | setWrappedProperty(this, 'onerror', value);
305 | }
306 | },
307 | 'onmessage': {
308 | get: function () {
309 | return getWrappedProperty(this, 'onmessage', null);
310 | },
311 | set: function (value) {
312 | setWrappedProperty(this, 'onmessage', value);
313 | }
314 | },
315 | 'onopen': {
316 | get: function () {
317 | return getWrappedProperty(this, 'onopen', null);
318 | },
319 | set: function (value) {
320 | setWrappedProperty(this, 'onopen', value);
321 | }
322 | },
323 | 'protocol': {
324 | get: function () {
325 | return getWrappedProperty(this, 'protocol', '');
326 | },
327 | set: emptyFunction
328 | },
329 | 'readyState': {
330 | get: function () {
331 | return getWrappedProperty(this, 'readyState', 0);
332 | },
333 | set: emptyFunction
334 | },
335 | 'url': {
336 | get: function () {
337 | return getWrappedProperty(this, 'url', '');
338 | },
339 | set: emptyFunction
340 | }
341 | });
342 |
343 | /**
344 | * Store this wrapper into a map along with a properties bag object.
345 | * Until we figure out what to do with this WS, we will
346 | * save all properties and listeners into that bag.
347 | */
348 | map.set(this, {
349 | args: {
350 | url: url,
351 | protocols: protocols
352 | },
353 | listeners: [],
354 | properties: {}
355 | });
356 |
357 | // This is the key point: checking if this WS should be blocked or not
358 | channel.sendMessage(url, this, channelResponseReceived);
359 | };
360 |
361 | // Safari doesn't have EventTarget
362 | var EventTarget = window.EventTarget || Element;
363 | WebSocket.prototype = Object.create(EventTarget.prototype, {
364 | CONNECTING: {value: 0},
365 | OPEN: {value: 1},
366 | CLOSING: {value: 2},
367 | CLOSED: {value: 3},
368 | addEventListener: {
369 | enumerable: true,
370 | value: function (ev, cb, fl) {
371 | if (cb instanceof Function === false) {
372 | return;
373 | }
374 | var wrapped = map.get(this);
375 | if (!wrapped) {
376 | return;
377 | }
378 | var cbb = cb.bind(this);
379 | if (wrapped instanceof Wrapped) {
380 | wrapped.addEventListener(ev, cbb, fl);
381 | } else {
382 | wrapped.listeners.push({ev: ev, cb: cbb, fl: fl});
383 | }
384 | },
385 | writable: true
386 | },
387 | close: {
388 | enumerable: true,
389 | value: function (code, reason) {
390 | 'native';
391 | var wrapped = map.get(this);
392 | if (wrapped instanceof Wrapped) {
393 | wrapped.close(code, reason);
394 | }
395 | },
396 | writable: true
397 | },
398 | removeEventListener: {
399 | enumerable: true,
400 | value: function (ev, cb, fl) {
401 | // TODO: Implement
402 | },
403 | writable: true
404 | },
405 | send: {
406 | enumerable: true,
407 | value: function (data) {
408 | 'native';
409 | var wrapped = map.get(this);
410 | if (wrapped instanceof Wrapped) {
411 | wrapped.send(data);
412 | }
413 | },
414 | writable: true
415 | }
416 | });
417 |
418 | WebSocket.CONNECTING = 0;
419 | WebSocket.OPEN = 1;
420 | WebSocket.CLOSING = 2;
421 | WebSocket.CLOSED = 3;
422 | window.WebSocket = WebSocket;
423 | })(imageChannel); // Use the appropriate channel here
424 |
425 | var me = document.currentScript;
426 | if ( me && me.parentNode !== null ) {
427 | me.parentNode.removeChild(me);
428 | }
429 | })();
--------------------------------------------------------------------------------