mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-15 15:32:28 +02:00
552 lines
16 KiB
JavaScript
552 lines
16 KiB
JavaScript
/*******************************************************************************
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µBlock - a Chromium browser extension to block requests.
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Copyright (C) 2014 Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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/* jshint bitwise: false */
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/* global chrome, YaMD5, µBlock */
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/******************************************************************************/
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// Low-level asset files manager
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µBlock.mirrors = (function() {
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/******************************************************************************/
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// To show keys in local storage from console:
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// chrome.storage.local.get(null, function (data) { console.log(Object.keys(data)) });
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// To cleanup cached items from console:
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// chrome.storage.local.get(null, function (data) { chrome.storage.local.remove(Object.keys(data).filter(function(a){ return a.indexOf('mirrors_item_') === 0; })); });
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var exports = {
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bytesInUseMax: 5 * 1024 * 1024,
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ttl: 21 * 24 * 60 * 60 * 1000,
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bytesInUse: 0,
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tryCount: 0,
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hitCount: 0
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};
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/******************************************************************************/
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var nullFunc = function() {};
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// TODO: need to come up with something better. Key shoud be domain. More
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// control over what significant part(s) of a URL is to be used as key.
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var mirrorCandidates = Object.create(null);
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var magicId = 'zicibucpobdu';
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var metadataPersistTimer = null;
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var bytesInUseMercy = 1 * 1024 * 1024;
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var metadata = {
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magicId: magicId,
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urlKeyToHashMap: {}
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};
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var hashToContentMap = {};
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var loaded = false;
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/******************************************************************************/
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// Ideally, URL keys and access time would be attached to the data URL entry
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// itself, but then this would mean the need to persist the whole data URL
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// every time a new URL key is added or the data URL is accessed, and given the
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// data URL can be quite large, that would make no sense efficiency-wise to
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// re-persist the whole thing.
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// So, ContentEntry persisted once, MetadataEntry persisted often.
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var MetadataEntry = function(hash) {
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this.accessTime = Date.now();
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this.hash = hash;
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};
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var ContentEntry = function(dataURL) {
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this.createTime = Date.now();
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this.dataURL = dataURL;
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};
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/******************************************************************************/
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var getTextFileFromURL = function(url, onLoad, onError) {
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if ( typeof onLoad !== 'function' ) {
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onLoad = nullFunc;
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}
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if ( typeof onError !== 'function' ) {
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onError = onLoad;
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}
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var xhr = new XMLHttpRequest();
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xhr.timeout = 10000;
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xhr.onload = onLoad;
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xhr.onerror = onError;
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xhr.ontimeout = onError;
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xhr.open('get', url, true);
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xhr.responseType = 'arraybuffer';
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xhr.send();
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};
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/******************************************************************************/
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// Safe binary-to-base64. Because window.btoa doesn't work for binary data...
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//
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// This implementation doesn't require the creation of a full-length
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// intermediate buffer. I expect less short-term memory use will translate in
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// more efficient conversion. Hopefully I will get time to confirm with
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// benchmarks in the future.
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var btoaMap = (function(){
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var out = new Uint8Array(64);
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var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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var i = chars.length;
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while ( i-- ) {
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out[i] = chars.charCodeAt(i);
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}
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return out;
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})();
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var btoaSafe = function(input) {
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var output = [];
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var bamap = btoaMap;
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var n = Math.floor(input.length / 3) * 3;
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var b1, b2, b3;
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for ( var ii = 0; ii < n; ii += 3 ) {
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b1 = input[ii ];
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b2 = input[ii+1];
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b3 = input[ii+2];
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output.push(String.fromCharCode(
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bamap[ b1 >>> 2],
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bamap[(b1 & 0x03) << 4 | b2 >>> 4],
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bamap[(b2 & 0x0F) << 2 | b3 >>> 6],
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bamap[ b3 & 0x3F ]
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));
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}
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// Leftover
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var m = input.length - n;
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if ( m > 1 ) {
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b1 = input[ii ];
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b2 = input[ii+1];
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output.push(String.fromCharCode(
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bamap[ b1 >>> 2],
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bamap[(b1 & 0x03) << 4 | b2 >>> 4],
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bamap[(b2 & 0x0F) << 2 ],
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0x3D
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));
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} else if ( m !== 0 ) {
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b1 = input[ii ];
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output.push(String.fromCharCode(
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bamap[ b1 >>>2],
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bamap[(b1 & 0x03) << 4 ],
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0x3D,
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0x3D
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));
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}
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return output.join('');
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};
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/******************************************************************************/
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// Extract a `key` from a URL.
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var toUrlKey = function(url) {
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if ( url.slice(0, 4) !== 'http' ) {
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return '';
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}
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var pos = url.indexOf('://');
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if ( pos === -1 ) {
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return '';
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}
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url = url.slice(pos + 3);
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pos = url.indexOf('/');
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if ( pos === -1 ) {
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return '';
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}
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var regexes = mirrorCandidates[url.slice(0, pos)];
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if ( regexes === undefined ) {
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return '';
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}
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var i = regexes.length;
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var matches;
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while ( i-- ) {
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matches = regexes[i].exec(url);
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if ( matches === null ) {
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continue;
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}
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return matches.length === 1 ? matches[0] : matches[1];
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}
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return '';
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};
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/******************************************************************************/
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// Ref: http://www.iana.org/assignments/media-types/media-types.xhtml
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var extractMimeType = function(ctin) {
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var pos = ctin.indexOf(';');
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return pos === -1 ? ctin.trim() : ctin.slice(0, pos).trim();
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};
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/******************************************************************************/
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var metadataExists = function(urlKey) {
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return typeof urlKey === 'string' &&
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metadata.urlKeyToHashMap.hasOwnProperty(urlKey);
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};
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/******************************************************************************/
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var contentExists = function(hash) {
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return typeof hash === 'string' &&
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hashToContentMap.hasOwnProperty(hash);
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};
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/******************************************************************************/
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var storageKeyFromHash = function(hash) {
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return 'mirrors_item_' + hash;
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};
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/******************************************************************************/
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// Given that a single data URL can be shared by many URL keys, pruning is a
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// bit hairy. So the steps are:
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// - Collate information about each data URL:
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// - Last time they were used
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// - Which URL keys reference them
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// This will allow us to flush from memory the ones least recently used first.
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var pruneToSize = function(toSize) {
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if ( exports.bytesInUse < toSize ) {
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return;
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}
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var k2hMap = metadata.urlKeyToHashMap;
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var h2cMap = hashToContentMap;
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var urlKey, hash;
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var mdEntry, ctEntry, prEntry;
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var pruneMap = {};
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for ( urlKey in k2hMap ) {
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if ( k2hMap.hasOwnProperty(urlKey) === false ) {
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continue;
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}
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mdEntry = k2hMap[urlKey];
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hash = mdEntry.hash;
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if ( pruneMap.hasOwnProperty(hash) === false ) {
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pruneMap[hash] = {
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urlKeys: [urlKey],
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accessTime: mdEntry.accessTime
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};
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continue;
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}
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prEntry = pruneMap[hash];
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prEntry.urlKeys.push(urlKey);
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prEntry.accessTime = Math.max(prEntry.accessTime, mdEntry.accessTime);
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}
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// Least recent at the end of array
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var compare = function(a, b) {
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return pruneMap[b].accessTime - pruneMap[a].accessTime;
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};
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var hashes = Object.keys(pruneMap).sort(compare);
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var toRemove = [];
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var i = hashes.length;
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while ( i-- ) {
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hash = hashes[i];
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prEntry = pruneMap[hash];
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ctEntry = h2cMap[hash];
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delete h2cMap[hash];
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toRemove.push(storageKeyFromHash(hash));
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exports.bytesInUse -= ctEntry.dataURL.length;
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while ( urlKey = prEntry.urlKeys.pop() ) {
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delete k2hMap[urlKey];
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}
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if ( exports.bytesInUse < toSize ) {
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break;
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}
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}
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if ( toRemove.length !== 0 ) {
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//console.debug('mirrors.pruneToSize(%d): removing %o', toSize, toRemove);
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removeContent(toRemove);
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updateMetadataNow();
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}
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};
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/******************************************************************************/
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var updateMetadata = function() {
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metadataPersistTimer = null;
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chrome.storage.local.set({ 'mirrors_metadata': metadata });
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};
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/******************************************************************************/
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var updateMetadataNow = function() {
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if ( metadataPersistTimer !== null ) {
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clearTimeout(metadataPersistTimer);
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}
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updateMetadata();
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};
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/******************************************************************************/
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var updateMetadataAsync = function() {
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if ( metadataPersistTimer === null ) {
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setTimeout(updateMetadata, 60 * 1000);
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}
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};
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/******************************************************************************/
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var addMetadata = function(urlKey, hash) {
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metadata.urlKeyToHashMap[urlKey] = new MetadataEntry(hash);
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updateMetadataNow();
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};
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/******************************************************************************/
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var removeMetadata = function(urlKey) {
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delete metadata.urlKeyToHashMap[urlKey];
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};
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/******************************************************************************/
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var addContent = function(hash, dataURL) {
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if ( contentExists(hash) ) {
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return;
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}
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var contentEntry = hashToContentMap[hash] = new ContentEntry(dataURL);
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exports.bytesInUse += dataURL.length;
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var bin = {};
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bin[storageKeyFromHash(hash)] = contentEntry;
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chrome.storage.local.set(bin);
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if ( exports.bytesInUse >= exports.bytesInUseMax + bytesInUseMercy ) {
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pruneToSize(exports.bytesInUseMax);
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}
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};
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/******************************************************************************/
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var removeContent = function(what) {
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chrome.storage.local.remove(what);
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};
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/******************************************************************************/
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var cacheAsset = function(url) {
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var urlKey = toUrlKey(url);
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if ( metadataExists(urlKey) ) {
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return;
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}
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var onRemoteAssetLoaded = function() {
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this.onload = this.onerror = null;
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if ( this.status !== 200 ) {
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return;
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}
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var mimeType = extractMimeType(this.getResponseHeader('Content-Type'));
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var yamd5 = new YaMD5();
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yamd5.appendAsciiStr(mimeType);
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yamd5.appendAsciiStr(this.response);
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var hash = yamd5.end();
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addMetadata(urlKey, hash);
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if ( contentExists(hash) ) {
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//console.debug('mirrors.cacheAsset(): reusing existing content for "%s"', urlKey);
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return;
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}
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//console.debug('mirrors.cacheAsset(): caching new content for "%s"', urlKey);
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// Keep original encoding if there was one, otherwise use base64 --
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// as the result is somewhat more compact I believe
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var dataUrl = null;
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try {
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dataUrl = 'data:' + mimeType + ';base64,' + btoaSafe(new Uint8Array(this.response));
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} catch (e) {
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//console.debug('"%s":', url, e);
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}
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if ( dataUrl !== null ) {
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addContent(hash, dataUrl);
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}
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};
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var onRemoteAssetError = function() {
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this.onload = this.onerror = null;
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};
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getTextFileFromURL(
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url,
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onRemoteAssetLoaded,
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onRemoteAssetError
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);
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};
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/******************************************************************************/
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var toURL = function(url, cache) {
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exports.tryCount += 1;
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var urlKey = toUrlKey(url);
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if ( urlKey === '' ) {
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return '';
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}
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if ( metadataExists(urlKey) === false ) {
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if ( cache === true ) {
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cacheAsset(url);
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}
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return '';
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}
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var dataURL = '';
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var metadataEntry = metadata.urlKeyToHashMap[urlKey];
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if ( contentExists(metadataEntry.hash) ) {
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dataURL = hashToContentMap[metadataEntry.hash].dataURL;
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metadataEntry.accessTime = Date.now();
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exports.hitCount += 1;
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} else {
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//console.debug('mirrors.toURL(): content not found "%s"', url);
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delete metadata.urlKeyToHashMap[urlKey];
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}
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updateMetadataAsync();
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return dataURL;
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};
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/******************************************************************************/
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var parseMirrorCandidates = function(rawText) {
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var rawTextEnd = rawText.length;
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var lineBeg = 0, lineEnd;
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var line;
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var key = '', re;
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while ( lineBeg < rawTextEnd ) {
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lineEnd = rawText.indexOf('\n', lineBeg);
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if ( lineEnd === -1 ) {
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lineEnd = rawText.indexOf('\r', lineBeg);
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if ( lineEnd === -1 ) {
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lineEnd = rawTextEnd;
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}
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}
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line = rawText.slice(lineBeg, lineEnd);
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lineBeg = lineEnd + 1;
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if ( line.charAt(0) === '#' ) {
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continue;
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}
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if ( line.charAt(0) !== ' ' ) {
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key = line.trim();
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continue;
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}
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if ( key === '' ) {
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continue;
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}
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re = new RegExp(line.trim());
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if ( mirrorCandidates[key] === undefined ) {
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mirrorCandidates[key] = [];
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}
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mirrorCandidates[key].push(re);
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}
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};
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/******************************************************************************/
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var load = function() {
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loaded = true;
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var onMirrorCandidatesReady = function(details) {
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if ( details.content !== '' ) {
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parseMirrorCandidates(details.content);
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}
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};
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var loadContent = function(urlKey, hash) {
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var binKey = storageKeyFromHash(hash);
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var onContentReady = function(bin) {
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if ( chrome.runtime.lastError || bin.hasOwnProperty(binKey) === false ) {
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//console.debug('mirrors.load(): failed to load content "%s"', binKey);
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removeMetadata(urlKey);
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removeContent(binKey);
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return;
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}
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//console.debug('mirrors.load(): loaded content "%s"', binKey);
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var ctEntry = hashToContentMap[hash] = bin[binKey];
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exports.bytesInUse += ctEntry.dataURL.length;
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};
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chrome.storage.local.get(binKey, onContentReady);
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};
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var onMetadataReady = function(bin) {
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//console.debug('mirrors.load(): loaded metadata');
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metadata = bin.mirrors_metadata;
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var mustReset = metadata.magicId !== magicId;
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var toRemove = [];
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var u2hmap = metadata.urlKeyToHashMap;
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var hash;
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for ( var urlKey in u2hmap ) {
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if ( u2hmap.hasOwnProperty(urlKey) === false ) {
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continue;
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}
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hash = u2hmap[urlKey].hash;
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if ( mustReset ) {
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toRemove.push(storageKeyFromHash(hash));
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removeMetadata(urlKey);
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continue;
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}
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loadContent(urlKey, hash);
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}
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if ( toRemove.length !== 0 ) {
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removeContent(toRemove);
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updateMetadataNow();
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}
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};
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chrome.storage.local.get({ 'mirrors_metadata': metadata }, onMetadataReady);
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µBlock.assets.get('assets/ublock/mirror-candidates.txt', onMirrorCandidatesReady);
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};
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/******************************************************************************/
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var unload = function() {
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pruneToSize(0);
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metadata.urlKeyToHashMap = {};
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hashToContentMap = {};
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exports.bytesInUse = 0;
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exports.hitCount = 0;
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loaded = false;
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};
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/******************************************************************************/
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exports.toggle = function(on) {
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if ( on && loaded !== true ) {
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load();
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} else if ( on !== true && loaded ) {
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unload();
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}
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};
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/******************************************************************************/
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// Export API
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exports.toURL = toURL;
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exports.pruneToSize = pruneToSize;
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return exports;
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/******************************************************************************/
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})();
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/******************************************************************************/
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