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/*******************************************************************************
µBlock - a 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
*/
/* jshint multistr: true */
/* global vAPI, HTMLDocument, XMLDocument */
/******************************************************************************/
// Injected into content pages
/******************************************************************************/
(function() {
'use strict';
/******************************************************************************/
// https://github.com/chrisaljoudi/uBlock/issues/464
if ( document instanceof HTMLDocument === false ) {
// https://github.com/chrisaljoudi/uBlock/issues/1528
// A XMLDocument can be a valid HTML document.
if (
document instanceof XMLDocument === false ||
document.createElement('div') instanceof HTMLDivElement === false
) {
return;
}
}
// This can happen
if ( typeof vAPI !== 'object' ) {
//console.debug('contentscript-start.js > vAPI not found');
return;
}
// https://github.com/chrisaljoudi/uBlock/issues/456
// Already injected?
if ( vAPI.contentscriptStartInjected ) {
//console.debug('contentscript-start.js > content script already injected');
return;
}
vAPI.contentscriptStartInjected = true;
vAPI.styles = vAPI.styles || [];
/******************************************************************************/
var localMessager = vAPI.messaging.channel('contentscript-start.js');
/******************************************************************************/
/******************************************************************************/
// Domain-based ABP cosmetic filters.
// These can be inserted before the DOM is loaded.
var cosmeticFilters = function(details) {
var donthideCosmeticFilters = {};
var hideCosmeticFilters = {};
var donthide = details.cosmeticDonthide;
var hide = details.cosmeticHide;
var i;
if ( donthide.length !== 0 ) {
i = donthide.length;
while ( i-- ) {
donthideCosmeticFilters[donthide[i]] = true;
}
}
// https://github.com/chrisaljoudi/uBlock/issues/143
if ( hide.length !== 0 ) {
i = hide.length;
var selector;
while ( i-- ) {
selector = hide[i];
if ( donthideCosmeticFilters[selector] ) {
hide.splice(i, 1);
} else {
hideCosmeticFilters[selector] = true;
}
}
}
if ( hide.length !== 0 ) {
var text = hide.join(',\n');
var style = vAPI.specificHideStyle = document.createElement('style');
// The linefeed before the style block is very important: do not remove!
style.appendChild(document.createTextNode(text + '\n{display:none !important;}'));
//console.debug('µBlock> "%s" cosmetic filters: injecting %d CSS rules:', details.domain, details.hide.length, hideStyleText);
var parent = document.head || document.documentElement;
if ( parent ) {
parent.appendChild(style);
vAPI.styles.push(style);
}
hideElements(text);
}
vAPI.donthideCosmeticFilters = donthideCosmeticFilters;
vAPI.hideCosmeticFilters = hideCosmeticFilters;
};
var netFilters = function(details) {
var parent = document.head || document.documentElement;
if ( !parent ) {
return;
}
var style = document.createElement('style');
var text = details.netHide.join(',\n');
var css = details.netCollapse ?
'\n{display:none !important;}' :
'\n{visibility:hidden !important;}';
style.appendChild(document.createTextNode(text + css));
parent.appendChild(style);
//console.debug('document.querySelectorAll("%s") = %o', text, document.querySelectorAll(text));
};
var filteringHandler = function(details) {
var styleTagCount = vAPI.styles.length;
vAPI.skipCosmeticFiltering = !details || details.skipCosmeticFiltering;
if ( details ) {
if ( details.cosmeticHide.length !== 0 || details.cosmeticDonthide.length !== 0 ) {
cosmeticFilters(details);
}
if ( details.netHide.length !== 0 ) {
netFilters(details);
}
// The port will never be used again at this point, disconnecting allows
// the browser to flush this script from memory.
}
// This is just to inform the background process that cosmetic filters were
// actually injected.
if ( vAPI.styles.length !== styleTagCount ) {
localMessager.send({ what: 'cosmeticFiltersActivated' });
}
// https://github.com/chrisaljoudi/uBlock/issues/587
// If no filters were found, maybe the script was injected before uBlock's
// process was fully initialized. When this happens, pages won't be
// cleaned right after browser launch.
vAPI.contentscriptStartInjected = details && details.ready;
// Cleanup before leaving
localMessager.close();
};
var hideElements = function(selectors) {
if ( document.body === null ) {
return;
}
var elems = document.querySelectorAll(selectors);
var i = elems.length;
if ( i === 0 ) {
return;
}
// https://github.com/chrisaljoudi/uBlock/issues/158
// Using CSSStyleDeclaration.setProperty is more reliable
if ( document.body.shadowRoot === undefined ) {
while ( i-- ) {
elems[i].style.setProperty('display', 'none', 'important');
}
return;
}
// https://github.com/gorhill/uBlock/issues/435
// Using shadow content so that we do not have to modify style
// attribute.
var sessionId = vAPI.sessionId;
var elem, shadow;
while ( i-- ) {
elem = elems[i];
shadow = elem.shadowRoot;
// https://www.chromestatus.com/features/4668884095336448
// "Multiple shadow roots is being deprecated."
if ( shadow !== null ) {
if ( shadow.className !== sessionId ) {
elem.style.setProperty('display', 'none', 'important');
}
continue;
}
// https://github.com/gorhill/uBlock/pull/555
// Not all nodes can be shadowed:
// https://github.com/w3c/webcomponents/issues/102
// https://github.com/gorhill/uBlock/issues/762
// Remove display style that might get in the way of the shadow
// node doing its magic.
try {
shadow = elem.createShadowRoot();
shadow.className = sessionId;
elem.style.removeProperty('display');
} catch (ex) {
elem.style.setProperty('display', 'none', 'important');
}
}
};
var url = window.location.href;
localMessager.send(
{
what: 'retrieveDomainCosmeticSelectors',
pageURL: url,
locationURL: url
},
filteringHandler
);
/******************************************************************************/
/******************************************************************************/
})();
/******************************************************************************/
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