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contentscript.js
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contentscript.js
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/*******************************************************************************
uBO-WebSocket - a companion browser extension to reveal
WebSocket connection attempts to uBlock origin.
Copyright (C) 2016 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/uBO-WebSocket
*/
/* global HTMLDocument, XMLDocument */
/******************************************************************************/
(function() {
'use strict';
/******************************************************************************/
var doc = document;
// https://github.com/chrisaljoudi/uBlock/issues/464
if ( doc instanceof HTMLDocument === false ) {
// https://github.com/chrisaljoudi/uBlock/issues/1528
// A XMLDocument can be a valid HTML document.
if (
doc instanceof XMLDocument === false ||
doc.createElement('div') instanceof HTMLDivElement === false
) {
return false;
}
}
// https://github.com/gorhill/uBlock/issues/1124
// Looks like `contentType` is on track to be standardized:
// https://dom.spec.whatwg.org/#concept-document-content-type
if ( (doc.contentType || '').lastIndexOf('image/', 0) === 0 ) {
return false;
}
// https://bugs.chromium.org/p/chromium/issues/detail?id=129353
// https://github.com/gorhill/uBlock/issues/956
// https://github.com/gorhill/uBlock/issues/1497
// Trap calls to WebSocket constructor, and expose websocket-based network
// requests to uBO's filtering engine, logger, etc.
// Counterpart of following block of code is found in "vapi-background.js" --
// search for "https://github.com/gorhill/uBlock/issues/1497".
/* jshint multistr: true */
// https://github.com/gorhill/uBlock/issues/1604
//return;
// Fix won't be applied on older versions of Chromium.
if (
window.WebSocket instanceof Function === false ||
window.WeakMap instanceof Function === false
) {
return false;
}
// Only for dynamically created frames and http/https documents.
if ( window.location.href !== "about:blank" &&
/^https?:/.test(window.location.protocol) !== true ) {
return false;
}
var parent = doc.head || doc.documentElement;
if ( parent === null ) {
return false;
}
// WebSocket reference: https://html.spec.whatwg.org/multipage/comms.html
// The script tag will remove itself from the DOM once it completes
// execution.
// Ideally, the `js/websocket.js` script would be declared as a
// `web_accessible_resources` in the manifest, but this unfortunately would
// open the door for web pages to identify *directly* that one is using
// uBlock Origin. Consequently, I have to inject the code as a literal
// string below :(
// For code review, the stringified code below is found in
// `js/websocket.js` (comments and empty lines were stripped).
var script = doc.createElement('script');
script.textContent = "\
(function() { \n\
'use strict'; \n\
var Wrapped = window.WebSocket; \n\
var toWrapped = new WeakMap(); \n\
var onResponseReceived = function(wrapper, ok) { \n\
this.onload = this.onerror = null; \n\
var bag = toWrapped.get(wrapper); \n\
if ( !ok ) { \n\
if ( bag.properties.onerror ) { \n\
bag.properties.onerror(new window.ErrorEvent('error')); \n\
} \n\
return; \n\
} \n\
var wrapped = null; \n\
try { \n\
wrapped = new Wrapped(bag.args.url, bag.args.protocols); \n\
} catch (ex) { \n\
console.error(ex.toString()); \n\
} \n\
if ( wrapped === null ) { \n\
return; \n\
} \n\
for ( var p in bag.properties ) { \n\
wrapped[p] = bag.properties[p]; \n\
} \n\
for ( var i = 0, l; i < bag.listeners.length; i++ ) { \n\
l = bag.listeners[i]; \n\
wrapped.addEventListener(l.ev, l.cb, l.fl); \n\
} \n\
Object.getPrototypeOf(wrapped).constructor = window.WebSocket; \n\
toWrapped.set(wrapper, wrapped); \n\
}; \n\
var noopfn = function() {}; \n\
var fallthruGet = function(wrapper, prop, value) { \n\
var wrapped = toWrapped.get(wrapper); \n\
if ( !wrapped ) { \n\
return value; \n\
} \n\
if ( wrapped instanceof Wrapped ) { \n\
return wrapped[prop]; \n\
} \n\
return wrapped.properties.hasOwnProperty(prop) ? \n\
wrapped.properties[prop] : \n\
value; \n\
}; \n\
var fallthruSet = function(wrapper, prop, value) { \n\
if ( value instanceof Function ) { \n\
value = value.bind(wrapper); \n\
} \n\
var wrapped = toWrapped.get(wrapper); \n\
if ( !wrapped ) { \n\
return; \n\
} \n\
if ( wrapped instanceof Wrapped ) { \n\
wrapped[prop] = value; \n\
} else { \n\
wrapped.properties[prop] = value; \n\
} \n\
}; \n\
var WebSocket = function(url, protocols) { \n\
'native'; \n\
if ( \n\
window.location.protocol === 'https:' && \n\
url.lastIndexOf('ws:', 0) === 0 \n\
) { \n\
var ws = new Wrapped(url, protocols); \n\
if ( ws ) { \n\
ws.close(); \n\
} \n\
} \n\
Object.defineProperties(this, { \n\
'binaryType': { \n\
get: function() { \n\
return fallthruGet(this, 'binaryType', 'blob'); \n\
}, \n\
set: function(value) { \n\
fallthruSet(this, 'binaryType', value); \n\
} \n\
}, \n\
'bufferedAmount': { \n\
get: function() { \n\
return fallthruGet(this, 'bufferedAmount', 0); \n\
}, \n\
set: noopfn \n\
}, \n\
'extensions': { \n\
get: function() { \n\
return fallthruGet(this, 'extensions', ''); \n\
}, \n\
set: noopfn \n\
}, \n\
'onclose': { \n\
get: function() { \n\
return fallthruGet(this, 'onclose', null); \n\
}, \n\
set: function(value) { \n\
fallthruSet(this, 'onclose', value); \n\
} \n\
}, \n\
'onerror': { \n\
get: function() { \n\
return fallthruGet(this, 'onerror', null); \n\
}, \n\
set: function(value) { \n\
fallthruSet(this, 'onerror', value); \n\
} \n\
}, \n\
'onmessage': { \n\
get: function() { \n\
return fallthruGet(this, 'onmessage', null); \n\
}, \n\
set: function(value) { \n\
fallthruSet(this, 'onmessage', value); \n\
} \n\
}, \n\
'onopen': { \n\
get: function() { \n\
return fallthruGet(this, 'onopen', null); \n\
}, \n\
set: function(value) { \n\
fallthruSet(this, 'onopen', value); \n\
} \n\
}, \n\
'protocol': { \n\
get: function() { \n\
return fallthruGet(this, 'protocol', ''); \n\
}, \n\
set: noopfn \n\
}, \n\
'readyState': { \n\
get: function() { \n\
return fallthruGet(this, 'readyState', 0); \n\
}, \n\
set: noopfn \n\
}, \n\
'url': { \n\
get: function() { \n\
return fallthruGet(this, 'url', ''); \n\
}, \n\
set: noopfn \n\
} \n\
}); \n\
toWrapped.set(this, { \n\
args: { url: url, protocols: protocols }, \n\
listeners: [], \n\
properties: {} \n\
}); \n\
var img = new Image(); \n\
img.src = \n\
window.location.origin \n\
+ '?url=' + encodeURIComponent(url) \n\
+ '&ubofix=f41665f3028c7fd10eecf573336216d3'; \n\
img.onload = onResponseReceived.bind(img, this, true); \n\
img.onerror = onResponseReceived.bind(img, this, false); \n\
}; \n\
WebSocket.prototype = Object.create(window.EventTarget.prototype, { \n\
CONNECTING: { value: 0 }, \n\
OPEN: { value: 1 }, \n\
CLOSING: { value: 2 }, \n\
CLOSED: { value: 3 }, \n\
addEventListener: { \n\
enumerable: true, \n\
value: function(ev, cb, fl) { \n\
if ( cb instanceof Function === false ) { \n\
return; \n\
} \n\
var wrapped = toWrapped.get(this); \n\
if ( !wrapped ) { \n\
return; \n\
} \n\
var cbb = cb.bind(this); \n\
if ( wrapped instanceof Wrapped ) { \n\
wrapped.addEventListener(ev, cbb, fl); \n\
} else { \n\
wrapped.listeners.push({ ev: ev, cb: cbb, fl: fl }); \n\
} \n\
}, \n\
writable: true \n\
}, \n\
close: { \n\
enumerable: true, \n\
value: function(code, reason) { \n\
'native'; \n\
var wrapped = toWrapped.get(this); \n\
if ( wrapped instanceof Wrapped ) { \n\
wrapped.close(code, reason); \n\
} \n\
}, \n\
writable: true \n\
}, \n\
removeEventListener: { \n\
enumerable: true, \n\
value: function(ev, cb, fl) { \n\
}, \n\
writable: true \n\
}, \n\
send: { \n\
enumerable: true, \n\
value: function(data) { \n\
'native'; \n\
var wrapped = toWrapped.get(this); \n\
if ( wrapped instanceof Wrapped ) { \n\
wrapped.send(data); \n\
} \n\
}, \n\
writable: true \n\
} \n\
}); \n\
WebSocket.CONNECTING = 0; \n\
WebSocket.OPEN = 1; \n\
WebSocket.CLOSING = 2; \n\
WebSocket.CLOSED = 3; \n\
window.WebSocket = WebSocket; \n\
var me = document.currentScript; \n\
if ( me && me.parentNode !== null ) { \n\
me.parentNode.removeChild(me); \n\
} \n\
})();";
try {
parent.appendChild(script);
} catch (ex) {
}
return true;
/******************************************************************************/
})();