/usr/share/chromium/extensions/ublock-origin/js/reverselookup-worker.js is in chromium-ublock-origin 1.13.8+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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uBlock Origin - a browser extension to block requests.
Copyright (C) 2015-2017 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 onmessage, postMessage */
'use strict';
/******************************************************************************/
var listEntries = Object.create(null),
filterClassSeparator = '\n/* end of network - start of cosmetic */\n';
/******************************************************************************/
var fromNetFilter = function(details) {
var lists = [],
compiledFilter = details.compiledFilter,
entry, content, pos, notFound;
for ( var assetKey in listEntries ) {
entry = listEntries[assetKey];
if ( entry === undefined ) { continue; }
content = entry.content.slice(
0,
entry.content.indexOf(filterClassSeparator)
);
pos = 0;
for (;;) {
pos = content.indexOf(compiledFilter, pos);
if ( pos === -1 ) { break; }
// We need an exact match.
// https://github.com/gorhill/uBlock/issues/1392
// https://github.com/gorhill/uBlock/issues/835
notFound = pos !== 0 && content.charCodeAt(pos - 1) !== 0x0A;
pos += compiledFilter.length;
if (
notFound ||
pos !== content.length && content.charCodeAt(pos) !== 0x0A
) {
continue;
}
lists.push({
title: entry.title,
supportURL: entry.supportURL
});
break;
}
}
var response = {};
response[details.rawFilter] = lists;
postMessage({
id: details.id,
response: response
});
};
/******************************************************************************/
// Looking up filter lists from a cosmetic filter is a bit more complicated
// than with network filters:
//
// The filter is its raw representation, not its compiled version. This is
// because the cosmetic filtering engine can't translate a live cosmetic
// filter into its compiled version. Reason is I do not want to burden
// cosmetic filtering with the resource overhead of being able to re-compile
// live cosmetic filters. I want the cosmetic filtering code to be left
// completely unaffected by reverse lookup requirements.
//
// Mainly, given a CSS selector and a hostname as context, we will derive
// various versions of compiled filters and see if there are matches. This way
// the whole CPU cost is incurred by the reverse lookup code -- in a worker
// thread, and the cosmetic filtering engine incurs no cost at all.
//
// For this though, the reverse lookup code here needs some knowledge of
// the inners of the cosmetic filtering engine.
// FilterContainer.fromCompiledContent() is our reference code to create
// the various compiled versions.
var fromCosmeticFilter = function(details) {
var match = /^#@?#/.exec(details.rawFilter),
prefix = match[0],
filter = details.rawFilter.slice(prefix.length);
var reFilter = new RegExp(
'[^\\n]*\\\\*"' +
reEscapeCosmetic(filter) +
'\\\\*"[^\\n]*',
'g'
);
var reHostname = new RegExp(
'^' +
details.hostname.split('.').reduce(
function(acc, item) {
return acc === ''
? item
: '(' + acc + '\\.)?' + item;
},
''
) +
'$'
);
var reEntity,
domain = details.domain,
pos = domain.indexOf('.');
if ( pos !== -1 ) {
reEntity = new RegExp(
'^' +
domain.slice(0, pos).split('.').reduce(
function(acc, item) {
return acc === ''
? item
: '(' + acc + '\\.)?' + item;
},
''
) +
'\\.\\*$'
);
}
var response = Object.create(null),
assetKey, entry, content, found, fargs;
for ( assetKey in listEntries ) {
entry = listEntries[assetKey];
if ( entry === undefined ) { continue; }
content = entry.content.slice(
entry.content.indexOf(filterClassSeparator) +
filterClassSeparator.length
);
found = undefined;
while ( (match = reFilter.exec(content)) !== null ) {
fargs = JSON.parse(match[0]);
switch ( fargs[0] ) {
case 0:
case 2:
case 4:
case 5:
case 7:
found = prefix + filter;
break;
case 1:
case 3:
if ( fargs[2] === filter ) {
found = prefix + filter;
}
break;
case 6:
case 8:
if (
fargs[2] === '' ||
reHostname.test(fargs[2]) === true ||
reEntity !== undefined && reEntity.test(fargs[2]) === true
) {
found = fargs[2] + prefix + filter;
}
break;
}
if ( found !== undefined ) {
if ( response[found] === undefined ) {
response[found] = [];
}
response[found].push({
title: entry.title,
supportURL: entry.supportURL
});
break;
}
}
}
postMessage({
id: details.id,
response: response
});
};
// https://github.com/gorhill/uBlock/issues/2666
// Raw filters in compiled filter lists may have been JSON-stringified one or
// multiple times.
var reEscapeCosmetic = function(s) {
return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
.replace(/"/g, '\\\\*"');
};
/******************************************************************************/
onmessage = function(e) { // jshint ignore:line
var msg = e.data;
switch ( msg.what ) {
case 'resetLists':
listEntries = Object.create(null);
break;
case 'setList':
listEntries[msg.details.assetKey] = msg.details;
break;
case 'fromNetFilter':
fromNetFilter(msg);
break;
case 'fromCosmeticFilter':
fromCosmeticFilter(msg);
break;
}
};
/******************************************************************************/
|