uBlock/js/traffic.js

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/*******************************************************************************
µBlock - a Chromium browser extension to block requests.
Copyright (C) 2014 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/uBlock
*/
/* global chrome, µBlock */
/******************************************************************************/
// Start isolation from global scope
µBlock.webRequest = (function() {
/******************************************************************************/
// Intercept and filter web requests according to white and black lists.
var onBeforeRequestHandler = function(details) {
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//console.debug('onBeforeRequestHandler()> "%s": %o', details.url, details);
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// Do not block behind the scene requests.
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var tabId = details.tabId;
if ( tabId < 0 ) {
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return;
}
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var µb = µBlock;
var requestType = details.type;
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// Never block root main doc.
if ( requestType === 'main_frame' && details.parentFrameId < 0 ) {
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µb.bindTabToPageStats(tabId, details.url);
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return;
}
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var requestURL = details.url;
var µburi = µb.URI.set(details.url);
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// Ignore non-http schemes
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var requestScheme = µburi.scheme;
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if ( requestScheme.indexOf('http') !== 0 ) {
return;
}
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var requestHostname = µburi.hostname;
var requestPath = µburi.path;
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// rhill 2013-12-15:
// Try to transpose generic `other` category into something more
// meaningful.
if ( requestType === 'other' ) {
requestType = µb.transposeType(requestType, requestPath);
}
// Lookup the page store associated with this tab id.
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var pageStore = µb.pageStoreFromTabId(tabId);
if ( !pageStore ) {
return;
}
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var reason = false;
if ( µb.getNetFilteringSwitch(pageStore.pageHostname) ) {
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//quickProfiler.start('abpFilters.matchString');
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reason = µb.abpFilters.matchString(pageStore, requestURL, requestType, requestHostname);
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//quickProfiler.stop();
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}
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// Record what happened.
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pageStore.recordRequest(requestType, requestURL, reason);
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// Not blocked?
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if ( reason === false || reason.slice(0, 2) === '@@' ) {
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return;
}
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// Blocked
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//console.debug('µBlock> onBeforeRequestHandler()> BLOCK "%s" because "%s"', details.url, reason);
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// https://github.com/gorhill/uBlock/issues/18
// Do not use redirection, we need to block outright to be sure the request
// will not be made. There can be no such guarantee with redirection.
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return { 'cancel': true };
};
/******************************************************************************/
chrome.webRequest.onBeforeRequest.addListener(
//function(details) {
// quickProfiler.start('onBeforeRequest');
// var r = onBeforeRequestHandler(details);
// quickProfiler.stop();
// return r;
//},
onBeforeRequestHandler,
{
"urls": [
"http://*/*",
"https://*/*",
],
"types": [
"main_frame",
"sub_frame",
'stylesheet',
"script",
"image",
"object",
"xmlhttprequest",
"other"
]
},
[ "blocking" ]
);
console.log('µBlock> Beginning to intercept net requests at %s', (new Date()).toISOString());
/******************************************************************************/
})();
/******************************************************************************/