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assets.js
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assets.js
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/*******************************************************************************
uBlock Origin - a browser extension to block requests.
Copyright (C) 2014-2018 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
*/
'use strict';
/******************************************************************************/
µBlock.assets = (function() {
/******************************************************************************/
var reIsExternalPath = /^(?:[a-z-]+):\/\//,
reIsUserAsset = /^user-/,
errorCantConnectTo = vAPI.i18n('errorCantConnectTo'),
noopfunc = function(){};
var api = {
};
/******************************************************************************/
var observers = [];
api.addObserver = function(observer) {
if ( observers.indexOf(observer) === -1 ) {
observers.push(observer);
}
};
api.removeObserver = function(observer) {
var pos;
while ( (pos = observers.indexOf(observer)) !== -1 ) {
observers.splice(pos, 1);
}
};
var fireNotification = function(topic, details) {
var result, r;
for ( var i = 0; i < observers.length; i++ ) {
r = observers[i](topic, details);
if ( r !== undefined ) { result = r; }
}
return result;
};
/******************************************************************************/
api.fetchText = function(url, onLoad, onError) {
var isExternal = reIsExternalPath.test(url),
actualUrl = isExternal ? url : vAPI.getURL(url);
// https://github.com/gorhill/uBlock/issues/2592
// Force browser cache to be bypassed, but only for resources which have
// been fetched more than one hour ago.
if ( isExternal ) {
var queryValue = '_=' + Math.floor(Date.now() / 7200000);
if ( actualUrl.indexOf('?') === -1 ) {
actualUrl += '?';
} else {
actualUrl += '&';
}
actualUrl += queryValue;
}
if ( typeof onError !== 'function' ) {
onError = onLoad;
}
var contentLoaded = 0,
timeoutAfter = µBlock.hiddenSettings.assetFetchTimeout * 1000 || 30000,
timeoutTimer,
xhr = new XMLHttpRequest();
var cleanup = function() {
xhr.removeEventListener('load', onLoadEvent);
xhr.removeEventListener('error', onErrorEvent);
xhr.removeEventListener('abort', onErrorEvent);
xhr.removeEventListener('progress', onProgressEvent);
if ( timeoutTimer !== undefined ) {
clearTimeout(timeoutTimer);
timeoutTimer = undefined;
}
};
// https://github.com/gorhill/uMatrix/issues/15
var onLoadEvent = function() {
cleanup();
// xhr for local files gives status 0, but actually succeeds
var details = {
url: url,
content: '',
statusCode: this.status || 200,
statusText: this.statusText || ''
};
if ( details.statusCode < 200 || details.statusCode >= 300 ) {
return onError.call(null, details);
}
// consider an empty result to be an error
if ( stringIsNotEmpty(this.responseText) === false ) {
return onError.call(null, details);
}
// we never download anything else than plain text: discard if response
// appears to be a HTML document: could happen when server serves
// some kind of error page I suppose
var text = this.responseText.trim();
if ( text.startsWith('<') && text.endsWith('>') ) {
return onError.call(null, details);
}
details.content = this.responseText;
onLoad(details);
};
var onErrorEvent = function() {
cleanup();
µBlock.logger.writeOne('', 'error', errorCantConnectTo.replace('{{msg}}', actualUrl));
onError({ url: url, content: '' });
};
var onTimeout = function() {
xhr.abort();
};
// https://github.com/gorhill/uBlock/issues/2526
// - Timeout only when there is no progress.
var onProgressEvent = function(ev) {
if ( ev.loaded === contentLoaded ) { return; }
contentLoaded = ev.loaded;
if ( timeoutTimer !== undefined ) {
clearTimeout(timeoutTimer);
}
timeoutTimer = vAPI.setTimeout(onTimeout, timeoutAfter);
};
// Be ready for thrown exceptions:
// I am pretty sure it used to work, but now using a URL such as
// `file:///` on Chromium 40 results in an exception being thrown.
try {
xhr.open('get', actualUrl, true);
xhr.addEventListener('load', onLoadEvent);
xhr.addEventListener('error', onErrorEvent);
xhr.addEventListener('abort', onErrorEvent);
xhr.addEventListener('progress', onProgressEvent);
xhr.responseType = 'text';
xhr.send();
timeoutTimer = vAPI.setTimeout(onTimeout, timeoutAfter);
} catch (e) {
onErrorEvent.call(xhr);
}
};
/******************************************************************************/
// https://github.com/gorhill/uBlock/issues/3331
// Support the seamless loading of sublists.
api.fetchFilterList = function(mainlistURL, onLoad, onError) {
var content = [],
errored = false,
pendingSublistURLs = new Set([ mainlistURL ]),
loadedSublistURLs = new Set(),
toParsedURL = api.fetchFilterList.toParsedURL;
// https://github.com/NanoAdblocker/NanoCore/issues/239
// Anything under URL's root directory is allowed to be fetched. The
// URL of a sublist will always be relative to the URL of the parent
// list (instead of the URL of the root list).
var rootDirectoryURL = toParsedURL(mainlistURL);
if ( rootDirectoryURL !== undefined ) {
var pos = rootDirectoryURL.pathname.lastIndexOf('/');
if ( pos !== -1 ) {
rootDirectoryURL.pathname =
rootDirectoryURL.pathname.slice(0, pos + 1);
}
}
var processIncludeDirectives = function(details) {
var reInclude = /^!#include +(\S+)/gm;
for (;;) {
var match = reInclude.exec(details.content);
if ( match === null ) { break; }
if ( toParsedURL(match[1]) !== undefined ) { continue; }
if ( match[1].indexOf('..') !== -1 ) { continue; }
var subURL = toParsedURL(details.url);
subURL.pathname = subURL.pathname.replace(/[^/]+$/, match[1]);
if ( subURL.href.startsWith(rootDirectoryURL.href) === false ) {
continue;
}
if ( pendingSublistURLs.has(subURL.href) ) { continue; }
if ( loadedSublistURLs.has(subURL.href) ) { continue; }
pendingSublistURLs.add(subURL.href);
api.fetchText(subURL.href, onLocalLoadSuccess, onLocalLoadError);
}
};
var onLocalLoadSuccess = function(details) {
if ( errored ) { return; }
var isSublist = details.url !== mainlistURL;
pendingSublistURLs.delete(details.url);
loadedSublistURLs.add(details.url);
if ( isSublist ) { content.push('\n! ' + '>>>>>>>> ' + details.url); }
content.push(details.content.trim());
if ( isSublist ) { content.push('! <<<<<<<< ' + details.url); }
if (
rootDirectoryURL !== undefined &&
rootDirectoryURL.pathname.length > 0
) {
processIncludeDirectives(details);
}
if ( pendingSublistURLs.size !== 0 ) { return; }
details.url = mainlistURL;
details.content = content.join('\n').trim();
if (/uBlockOrigin\/uAssets/.test(mainlistURL)) {
details.content = api.fetchFilterList.legacy.convert(details.content);
}
onLoad(details);
};
// https://github.com/AdguardTeam/FiltersRegistry/issues/82
// Not checking for `errored` status was causing repeated notifications
// to the caller. This can happens when more than one out of multiple
// sublists can't be fetched.
var onLocalLoadError = function(details) {
if ( errored ) { return; }
errored = true;
details.url = mainlistURL;
details.content = '';
onError(details);
};
this.fetchText(mainlistURL, onLocalLoadSuccess, onLocalLoadError);
};
api.fetchFilterList.toParsedURL = function(url) {
try {
return new URL(url);
} catch (ex) {
}
};
api.fetchFilterList.legacy = {
mapRules: {
'=1x1.gif': '=1x1-transparent.gif',
'=2x2.png': '=2x2-transparent.png',
'=3x2.png': '=3x2-transparent.png',
'=32x32.png': '=32x32-transparent.png',
'=addthis_widget.js': '=addthis.com/addthis_widget.js',
'=ampproject_v0.js': '=ampproject.org/v0.js',
'=chartbeat.js': '=static.chartbeat.com/chartbeat.js',
'=amazon_ads.js': '=amazon-adsystem.com/aax2/amzn_ads.js',
'=disqus_embed.js': '=disqus.com/embed.js',
'=disqus_forums_embed.js': '=disqus.com/forums/*/embed.js',
'=doubleclick_instream_ad_status.js': '=doubleclick.net/instream/ad_status.js',
'=google-analytics_analytics.js': '=google-analytics.com/analytics.js',
'=google-analytics_cx_api.js': '=google-analytics.com/cx/api.js',
'=google-analytics_ga.js': '=google-analytics.com/ga.js',
'=google-analytics_inpage_linkid.js': '=google-analytics.com/inpage_linkid.js',
'=googlesyndication_adsbygoogle.js': '=googlesyndication.com/adsbygoogle.js',
'=googletagmanager_gtm.js': '=googletagmanager.com/gtm.js',
'=googletagservices_gpt.js': '=googletagservices.com/gpt.js',
'=ligatus_angular-tag.js': '=ligatus.com/*/angular-tag.js',
'=monkeybroker.js': '=d3pkae9owd2lcf.cloudfront.net/mb105.js',
'=noop-0.1s.mp3': '=noopmp3-0.1s',
'=noop-1s.mp4': '=noopmp4-1s',
'=noop.html': '=noopframe',
'=outbrain-widget.js': '=widgets.outbrain.com/outbrain.js',
'=scorecardresearch_beacon.js': '=scorecardresearch.com/beacon.js',
'=noeval-silent.js': '=silent-noeval.js',
'=silent-noeval': '=silent-noeval.js',
'=noop.js': '=noopjs',
'=noop.txt': '=nooptext',
'=popads.js': '=popads.net.js',
'(popads.js)': '(popads.net.js)',
'(popads)': '(popads.net.js)',
'(nobab)': '(bab-defuser.js)',
'(nofab)': '(fuckadblock.js-3.2.0)',
'(acis,': '(abort-current-inline-script.js,',
'(acis.js,': '(abort-current-inline-script.js,',
'(aopr,': '(abort-on-property-read.js,',
'(aopr.js,': '(abort-on-property-read.js,',
'(aopw,': '(abort-on-property-write.js,',
'(aopw.js,': '(abort-on-property-write.js,',
'(aeld,': '(addEventListener-defuser.js,',
'(aeld)': '(addEventListener-defuser.js)',
'(aell,': '(addEventListener-logger.js,',
'(aell)': '(addEventListener-logger.js)',
'(nano-sib,': '(nano-setInterval-booster.js,',
'(nano-sib)': '(nano-setInterval-booster.js)',
'(nano-sib.js)': '(nano-setInterval-booster.js)',
'(nano-stb,': '(nano-setTimeout-booster.js,',
'(nano-stb)': '(nano-setTimeout-booster.js)',
'(nano-stb.js)': '(nano-setTimeout-booster.js)',
'(ra,': '(remove-attr.js,',
'(sid,': '(setInterval-defuser.js,',
'(nosiif,': '(setInterval-defuser.js,',
'(nosiif)': '(setInterval-defuser.js)',
'(std,': '(setTimeout-defuser.js,',
'(nostif,': '(setTimeout-defuser.js,',
'(nostif)': '(setTimeout-defuser.js)',
'(window.open-defuser,': '(window.open-defuser.js,',
'(window.open-defuser)': '(window.open-defuser.js)',
'(set-constant,': '(set-constant.js,',
'(set,': '(set-constant.js,',
'(noeval)': '(noeval.js)',
'(nowebrtc)': '(nowebrtc.js)'
},
get mapRegex() {
delete this.mapRegex;
return this.mapRegex = new RegExp(Object.keys(this.mapRules)
.join('|').replace(/[().]/g, '\\$&'), 'g');
},
convert: function(content) {
var that = this;
return content.replace(/^(.*\(no(siif|stif).+!.*)$/mg, '! $1')
.replace(this.mapRegex, function(matched) {
return that.mapRules[matched];
});
}
};
/*******************************************************************************
The purpose of the asset source registry is to keep key detail information
about an asset:
- Where to load it from: this may consist of one or more URLs, either local
or remote.
- After how many days an asset should be deemed obsolete -- i.e. in need of
an update.
- The origin and type of an asset.
- The last time an asset was registered.
**/
var assetSourceRegistryStatus,
assetSourceRegistry = Object.create(null);
var registerAssetSource = function(assetKey, dict) {
var entry = assetSourceRegistry[assetKey] || {};
for ( var prop in dict ) {
if ( dict.hasOwnProperty(prop) === false ) { continue; }
if ( dict[prop] === undefined ) {
delete entry[prop];
} else {
entry[prop] = dict[prop];
}
}
var contentURL = dict.contentURL;
if ( contentURL !== undefined ) {
if ( typeof contentURL === 'string' ) {
contentURL = entry.contentURL = [ contentURL ];
} else if ( Array.isArray(contentURL) === false ) {
contentURL = entry.contentURL = [];
}
var remoteURLCount = 0;
for ( var i = 0; i < contentURL.length; i++ ) {
if ( reIsExternalPath.test(contentURL[i]) ) {
remoteURLCount += 1;
}
}
entry.hasLocalURL = remoteURLCount !== contentURL.length;
entry.hasRemoteURL = remoteURLCount !== 0;
} else if ( entry.contentURL === undefined ) {
entry.contentURL = [];
}
if ( typeof entry.updateAfter !== 'number' ) {
entry.updateAfter = 5;
}
if ( entry.submitter ) {
entry.submitTime = Date.now(); // To detect stale entries
}
assetSourceRegistry[assetKey] = entry;
};
var unregisterAssetSource = function(assetKey) {
assetCacheRemove(assetKey);
delete assetSourceRegistry[assetKey];
};
var saveAssetSourceRegistry = (function() {
var timer;
var save = function() {
timer = undefined;
vAPI.cacheStorage.set({ assetSourceRegistry: assetSourceRegistry });
};
return function(lazily) {
if ( timer !== undefined ) {
clearTimeout(timer);
}
if ( lazily ) {
timer = vAPI.setTimeout(save, 500);
} else {
save();
}
};
})();
var updateAssetSourceRegistry = function(json, silent) {
var newDict;
try {
newDict = JSON.parse(json);
} catch (ex) {
}
if ( newDict instanceof Object === false ) { return; }
var oldDict = assetSourceRegistry,
assetKey;
// Remove obsolete entries (only those which were built-in).
for ( assetKey in oldDict ) {
if (
newDict[assetKey] === undefined &&
oldDict[assetKey].submitter === undefined
) {
unregisterAssetSource(assetKey);
}
}
// Add/update existing entries. Notify of new asset sources.
for ( assetKey in newDict ) {
if ( oldDict[assetKey] === undefined && !silent ) {
fireNotification(
'builtin-asset-source-added',
{ assetKey: assetKey, entry: newDict[assetKey] }
);
}
registerAssetSource(assetKey, newDict[assetKey]);
}
saveAssetSourceRegistry();
};
var getAssetSourceRegistry = function(callback) {
// Already loaded.
if ( assetSourceRegistryStatus === 'ready' ) {
callback(assetSourceRegistry);
return;
}
// Being loaded.
if ( Array.isArray(assetSourceRegistryStatus) ) {
assetSourceRegistryStatus.push(callback);
return;
}
// Not loaded: load it.
assetSourceRegistryStatus = [ callback ];
var registryReady = function() {
var callers = assetSourceRegistryStatus;
assetSourceRegistryStatus = 'ready';
var fn;
while ( (fn = callers.shift()) ) {
fn(assetSourceRegistry);
}
};
// First-install case.
var createRegistry = function() {
api.fetchText(
µBlock.assetsBootstrapLocation || 'assets/assets.json',
function(details) {
updateAssetSourceRegistry(details.content, true);
registryReady();
}
);
};
vAPI.cacheStorage.get('assetSourceRegistry', function(bin) {
if ( !bin || !bin.assetSourceRegistry ) {
createRegistry();
return;
}
assetSourceRegistry = bin.assetSourceRegistry;
registryReady();
});
};
api.registerAssetSource = function(assetKey, details) {
getAssetSourceRegistry(function() {
registerAssetSource(assetKey, details);
saveAssetSourceRegistry(true);
});
};
api.unregisterAssetSource = function(assetKey) {
getAssetSourceRegistry(function() {
unregisterAssetSource(assetKey);
saveAssetSourceRegistry(true);
});
};
/*******************************************************************************
The purpose of the asset cache registry is to keep track of all assets
which have been persisted into the local cache.
**/
var assetCacheRegistryStatus,
assetCacheRegistryStartTime = Date.now(),
assetCacheRegistry = {};
var getAssetCacheRegistry = function(callback) {
// Already loaded.
if ( assetCacheRegistryStatus === 'ready' ) {
callback(assetCacheRegistry);
return;
}
// Being loaded.
if ( Array.isArray(assetCacheRegistryStatus) ) {
assetCacheRegistryStatus.push(callback);
return;
}
// Not loaded: load it.
assetCacheRegistryStatus = [ callback ];
var registryReady = function() {
var callers = assetCacheRegistryStatus;
assetCacheRegistryStatus = 'ready';
var fn;
while ( (fn = callers.shift()) ) {
fn(assetCacheRegistry);
}
};
vAPI.cacheStorage.get('assetCacheRegistry', function(bin) {
if ( bin && bin.assetCacheRegistry ) {
assetCacheRegistry = bin.assetCacheRegistry;
}
registryReady();
});
};
var saveAssetCacheRegistry = (function() {
var timer;
var save = function() {
timer = undefined;
vAPI.cacheStorage.set({ assetCacheRegistry: assetCacheRegistry });
};
return function(lazily) {
if ( timer !== undefined ) { clearTimeout(timer); }
if ( lazily ) {
timer = vAPI.setTimeout(save, 500);
} else {
save();
}
};
})();
var assetCacheRead = function(assetKey, callback) {
var internalKey = 'cache/' + assetKey;
var reportBack = function(content, err) {
var details = { assetKey: assetKey, content: content };
if ( err ) { details.error = err; }
callback(details);
};
var onAssetRead = function(bin) {
if ( !bin || !bin[internalKey] ) {
return reportBack('', 'E_NOTFOUND');
}
var entry = assetCacheRegistry[assetKey];
if ( entry === undefined ) {
return reportBack('', 'E_NOTFOUND');
}
entry.readTime = Date.now();
saveAssetCacheRegistry(true);
reportBack(bin[internalKey]);
};
var onReady = function() {
vAPI.cacheStorage.get(internalKey, onAssetRead);
};
getAssetCacheRegistry(onReady);
};
var assetCacheWrite = function(assetKey, details, callback) {
var internalKey = 'cache/' + assetKey;
var content = '';
if ( typeof details === 'string' ) {
content = details;
} else if ( details instanceof Object ) {
content = details.content || '';
}
if ( content === '' ) {
return assetCacheRemove(assetKey, callback);
}
var reportBack = function(content) {
var details = { assetKey: assetKey, content: content };
if ( typeof callback === 'function' ) {
callback(details);
}
fireNotification('after-asset-updated', details);
};
var onReady = function() {
var entry = assetCacheRegistry[assetKey];
if ( entry === undefined ) {
entry = assetCacheRegistry[assetKey] = {};
}
entry.writeTime = entry.readTime = Date.now();
if ( details instanceof Object && typeof details.url === 'string' ) {
entry.remoteURL = details.url;
}
var bin = { assetCacheRegistry: assetCacheRegistry };
bin[internalKey] = content;
vAPI.cacheStorage.set(bin);
reportBack(content);
};
getAssetCacheRegistry(onReady);
};
var assetCacheRemove = function(pattern, callback) {
var onReady = function() {
var cacheDict = assetCacheRegistry,
removedEntries = [],
removedContent = [];
for ( var assetKey in cacheDict ) {
if ( pattern instanceof RegExp && !pattern.test(assetKey) ) {
continue;
}
if ( typeof pattern === 'string' && assetKey !== pattern ) {
continue;
}
removedEntries.push(assetKey);
removedContent.push('cache/' + assetKey);
delete cacheDict[assetKey];
}
if ( removedContent.length !== 0 ) {
vAPI.cacheStorage.remove(removedContent);
var bin = { assetCacheRegistry: assetCacheRegistry };
vAPI.cacheStorage.set(bin);
}
if ( typeof callback === 'function' ) {
callback();
}
for ( var i = 0; i < removedEntries.length; i++ ) {
fireNotification('after-asset-updated', { assetKey: removedEntries[i] });
}
};
getAssetCacheRegistry(onReady);
};
var assetCacheMarkAsDirty = function(pattern, exclude, callback) {
var onReady = function() {
var cacheDict = assetCacheRegistry,
cacheEntry,
mustSave = false;
for ( var assetKey in cacheDict ) {
if ( pattern instanceof RegExp ) {
if ( pattern.test(assetKey) === false ) { continue; }
} else if ( typeof pattern === 'string' ) {
if ( assetKey !== pattern ) { continue; }
} else if ( Array.isArray(pattern) ) {
if ( pattern.indexOf(assetKey) === -1 ) { continue; }
}
if ( exclude instanceof RegExp ) {
if ( exclude.test(assetKey) ) { continue; }
} else if ( typeof exclude === 'string' ) {
if ( assetKey === exclude ) { continue; }
} else if ( Array.isArray(exclude) ) {
if ( exclude.indexOf(assetKey) !== -1 ) { continue; }
}
cacheEntry = cacheDict[assetKey];
if ( !cacheEntry.writeTime ) { continue; }
cacheDict[assetKey].writeTime = 0;
mustSave = true;
}
if ( mustSave ) {
var bin = { assetCacheRegistry: assetCacheRegistry };
vAPI.cacheStorage.set(bin);
}
if ( typeof callback === 'function' ) {
callback();
}
};
if ( typeof exclude === 'function' ) {
callback = exclude;
exclude = undefined;
}
getAssetCacheRegistry(onReady);
};
/******************************************************************************/
var stringIsNotEmpty = function(s) {
return typeof s === 'string' && s !== '';
};
/*******************************************************************************
User assets are NOT persisted in the cache storage. User assets are
recognized by the asset key which always starts with 'user-'.
TODO(seamless migration):
Can remove instances of old user asset keys when I am confident all users
are using uBO v1.11 and beyond.
**/
var readUserAsset = function(assetKey, callback) {
var reportBack = function(content) {
callback({ assetKey: assetKey, content: content });
};
var onLoaded = function(bin) {
if ( !bin ) { return reportBack(''); }
var content = '';
if ( typeof bin['cached_asset_content://assets/user/filters.txt'] === 'string' ) {
content = bin['cached_asset_content://assets/user/filters.txt'];
vAPI.cacheStorage.remove('cached_asset_content://assets/user/filters.txt');
}
if ( typeof bin['assets/user/filters.txt'] === 'string' ) {
content = bin['assets/user/filters.txt'];
// TODO(seamless migration):
// Uncomment once all moved to v1.11+.
//vAPI.storage.remove('assets/user/filters.txt');
}
if ( typeof bin[assetKey] === 'string' ) {
// TODO(seamless migration):
// Replace conditional with assignment once all moved to v1.11+
if ( content !== bin[assetKey] ) {
saveUserAsset(assetKey, content);
}
} else if ( content !== '' ) {
saveUserAsset(assetKey, content);
}
return reportBack(content);
};
var toRead = assetKey;
if ( assetKey === µBlock.userFiltersPath ) {
toRead = [
assetKey,
'assets/user/filters.txt',
'cached_asset_content://assets/user/filters.txt'
];
}
vAPI.storage.get(toRead, onLoaded);
};
var saveUserAsset = function(assetKey, content, callback) {
var bin = {};
bin[assetKey] = content;
// TODO(seamless migration):
// This is for forward compatibility. Only for a limited time. Remove when
// everybody moved to 1.11.0 and beyond.
// >>>>>>>>
if ( assetKey === µBlock.userFiltersPath ) {
bin['assets/user/filters.txt'] = content;
}
// <<<<<<<<
var onSaved = function() {
if ( callback instanceof Function ) {
callback({ assetKey: assetKey, content: content });
}
};
vAPI.storage.set(bin, onSaved);
};
/******************************************************************************/
api.get = function(assetKey, options, callback) {
if ( typeof options === 'function' ) {
callback = options;
options = {};
} else if ( typeof callback !== 'function' ) {
callback = noopfunc;
}
if ( assetKey === µBlock.userFiltersPath ) {
readUserAsset(assetKey, callback);
return;
}
var assetDetails = {},
contentURLs,
contentURL;
var reportBack = function(content, err) {
var details = { assetKey: assetKey, content: content };
if ( err ) {
details.error = assetDetails.lastError = err;
} else {
assetDetails.lastError = undefined;
}
callback(details);
};
var onContentNotLoaded = function() {
var isExternal;
while ( (contentURL = contentURLs.shift()) ) {
isExternal = reIsExternalPath.test(contentURL);
if ( isExternal === false || assetDetails.hasLocalURL !== true ) {
break;
}
}
if ( !contentURL ) {
return reportBack('', 'E_NOTFOUND');
}
if ( assetDetails.content === 'filters' ) {
api.fetchFilterList(contentURL, onContentLoaded, onContentNotLoaded);
} else {
api.fetchText(contentURL, onContentLoaded, onContentNotLoaded);
}
};
var onContentLoaded = function(details) {
if ( stringIsNotEmpty(details.content) === false ) {
onContentNotLoaded();
return;
}
if ( reIsExternalPath.test(contentURL) && options.dontCache !== true ) {
assetCacheWrite(assetKey, {
content: details.content,
url: contentURL
});
}
reportBack(details.content);
};
var onCachedContentLoaded = function(details) {
if ( details.content !== '' ) {
return reportBack(details.content);
}
getAssetSourceRegistry(function(registry) {
assetDetails = registry[assetKey] || {};
if ( typeof assetDetails.contentURL === 'string' ) {
contentURLs = [ assetDetails.contentURL ];
} else if ( Array.isArray(assetDetails.contentURL) ) {
contentURLs = assetDetails.contentURL.slice(0);
} else {
contentURLs = [];
}
onContentNotLoaded();
});
};
assetCacheRead(assetKey, onCachedContentLoaded);
};
/******************************************************************************/
var getRemote = function(assetKey, callback) {
var assetDetails = {},
contentURLs,
contentURL;
var reportBack = function(content, err) {
var details = { assetKey: assetKey, content: content };
if ( err ) {
details.error = assetDetails.lastError = err;
} else {
assetDetails.lastError = undefined;
}
callback(details);
};
var onRemoteContentLoaded = function(details) {
if ( stringIsNotEmpty(details.content) === false ) {
registerAssetSource(assetKey, { error: { time: Date.now(), error: 'No content' } });
tryLoading();
return;
}
assetCacheWrite(assetKey, {
content: details.content,
url: contentURL
});
registerAssetSource(assetKey, { error: undefined });
reportBack(details.content);
};
var onRemoteContentError = function(details) {
var text = details.statusText;
if ( details.statusCode === 0 ) {
text = 'network error';
}
registerAssetSource(assetKey, { error: { time: Date.now(), error: text } });
tryLoading();
};
var tryLoading = function() {
while ( (contentURL = contentURLs.shift()) ) {
if ( reIsExternalPath.test(contentURL) ) { break; }
}
if ( !contentURL ) {
return reportBack('', 'E_NOTFOUND');
}
if ( assetDetails.content === 'filters' ) {
api.fetchFilterList(contentURL, onRemoteContentLoaded, onRemoteContentError);
} else {
api.fetchText(contentURL, onRemoteContentLoaded, onRemoteContentError);
}
};
getAssetSourceRegistry(function(registry) {
assetDetails = registry[assetKey] || {};
if ( typeof assetDetails.contentURL === 'string' ) {
contentURLs = [ assetDetails.contentURL ];
} else if ( Array.isArray(assetDetails.contentURL) ) {
contentURLs = assetDetails.contentURL.slice(0);
} else {
contentURLs = [];
}
tryLoading();
});
};
/******************************************************************************/
api.put = function(assetKey, content, callback) {
if ( reIsUserAsset.test(assetKey) ) {
return saveUserAsset(assetKey, content, callback);
}
assetCacheWrite(assetKey, content, callback);
};
/******************************************************************************/
api.metadata = function(callback) {
var assetRegistryReady = false,
cacheRegistryReady = false;
var onReady = function() {
var assetDict = JSON.parse(JSON.stringify(assetSourceRegistry)),
cacheDict = assetCacheRegistry,
assetEntry, cacheEntry,
now = Date.now(), obsoleteAfter;
for ( var assetKey in assetDict ) {
assetEntry = assetDict[assetKey];
cacheEntry = cacheDict[assetKey];
if ( cacheEntry ) {
assetEntry.cached = true;
assetEntry.writeTime = cacheEntry.writeTime;
obsoleteAfter = cacheEntry.writeTime + assetEntry.updateAfter * 86400000;
assetEntry.obsolete = obsoleteAfter < now;
assetEntry.remoteURL = cacheEntry.remoteURL;
} else if (
assetEntry.contentURL &&
assetEntry.contentURL.length !== 0
) {
assetEntry.writeTime = 0;
obsoleteAfter = 0;
assetEntry.obsolete = true;
}
}
callback(assetDict);
};
getAssetSourceRegistry(function() {
assetRegistryReady = true;
if ( cacheRegistryReady ) { onReady(); }
});
getAssetCacheRegistry(function() {
cacheRegistryReady = true;
if ( assetRegistryReady ) { onReady(); }
});
};
/******************************************************************************/
api.purge = assetCacheMarkAsDirty;
api.remove = function(pattern, callback) {
assetCacheRemove(pattern, callback);
};
api.rmrf = function() {
assetCacheRemove(/./);
};