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nuTensor/platform/chromium/vapi-background.js

1059 lines
33 KiB
JavaScript

/*******************************************************************************
uMatrix - a browser extension to block requests.
Copyright (C) 2014-2017 The uBlock Origin authors
Copyright (C) 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/uMatrix
*/
/* global self, µMatrix */
// For background page
'use strict';
/******************************************************************************/
(function() {
/******************************************************************************/
var vAPI = self.vAPI = self.vAPI || {};
var chrome = self.chrome;
var manifest = chrome.runtime.getManifest();
vAPI.chrome = true;
var noopFunc = function(){};
/******************************************************************************/
// https://github.com/gorhill/uMatrix/issues/234
// https://developer.chrome.com/extensions/privacy#property-network
chrome.privacy.network.networkPredictionEnabled.set({
value: false
});
// rhill 2013-12-07:
// Tell Chromium to allow all javascript: µMatrix will control whether
// javascript execute through `Content-Policy-Directive` and webRequest.
// https://github.com/gorhill/httpswitchboard/issues/74
if ( chrome.contentSettings instanceof Object ) {
chrome.contentSettings.javascript.set({
primaryPattern: 'https://*/*',
setting: 'allow'
});
chrome.contentSettings.javascript.set({
primaryPattern: 'http://*/*',
setting: 'allow'
});
}
/******************************************************************************/
vAPI.app = {
name: manifest.name,
version: manifest.version
};
/******************************************************************************/
vAPI.app.start = function() {
// rhill 2013-12-07:
// Relinquish control over javascript execution to the user.
// https://github.com/gorhill/httpswitchboard/issues/74
//chrome.contentSettings.javascript.clear({});
};
/******************************************************************************/
vAPI.app.stop = function() {
chrome.contentSettings.javascript.clear({});
// rhill 2013-12-07:
// Tell Chromium to allow all javascript: µMatrix will control whether
// javascript execute through `Content-Policy-Directive` and webRequest.
// https://github.com/gorhill/httpswitchboard/issues/74
//chrome.contentSettings.javascript.set({
// primaryPattern: 'https://*/*',
// setting: 'allow'
//});
//chrome.contentSettings.javascript.set({
// primaryPattern: 'http://*/*',
// setting: 'allow'
//});
};
/******************************************************************************/
vAPI.app.restart = function() {
chrome.runtime.reload();
};
/******************************************************************************/
// chrome.storage.local.get(null, function(bin){ console.debug('%o', bin); });
vAPI.storage = chrome.storage.local;
vAPI.cacheStorage = chrome.storage.local;
/******************************************************************************/
vAPI.tabs = {};
/******************************************************************************/
vAPI.isBehindTheSceneTabId = function(tabId) {
return tabId.toString() === '-1';
};
vAPI.noTabId = '-1';
/******************************************************************************/
vAPI.tabs.registerListeners = function() {
var onNavigationClient = this.onNavigation || noopFunc;
var onUpdatedClient = this.onUpdated || noopFunc;
var onClosedClient = this.onClosed || noopFunc;
// https://developer.chrome.com/extensions/webNavigation
// [onCreatedNavigationTarget ->]
// onBeforeNavigate ->
// onCommitted ->
// onDOMContentLoaded ->
// onCompleted
// The chrome.webRequest.onBeforeRequest() won't be called for everything
// else than `http`/`https`. Thus, in such case, we will bind the tab as
// early as possible in order to increase the likelihood of a context
// properly setup if network requests are fired from within the tab.
// Example: Chromium + case #6 at
// http://raymondhill.net/ublock/popup.html
var reGoodForWebRequestAPI = /^https?:\/\//;
var onCreatedNavigationTarget = function(details) {
//console.debug('onCreatedNavigationTarget: tab id %d = "%s"', details.tabId, details.url);
if ( reGoodForWebRequestAPI.test(details.url) ) {
return;
}
details.tabId = details.tabId.toString();
onNavigationClient(details);
};
var onUpdated = function(tabId, changeInfo, tab) {
tabId = tabId.toString();
onUpdatedClient(tabId, changeInfo, tab);
};
var onCommitted = function(details) {
// Important: do not call client if not top frame.
if ( details.frameId !== 0 ) {
return;
}
details.tabId = details.tabId.toString();
onNavigationClient(details);
//console.debug('onCommitted: tab id %d = "%s"', details.tabId, details.url);
};
var onClosed = function(tabId) {
onClosedClient(tabId.toString());
};
chrome.webNavigation.onCreatedNavigationTarget.addListener(onCreatedNavigationTarget);
chrome.webNavigation.onCommitted.addListener(onCommitted);
chrome.tabs.onUpdated.addListener(onUpdated);
chrome.tabs.onRemoved.addListener(onClosed);
};
/******************************************************************************/
// tabId: null, // active tab
vAPI.tabs.get = function(tabId, callback) {
var onTabReady = function(tab) {
// https://code.google.com/p/chromium/issues/detail?id=410868#c8
if ( chrome.runtime.lastError ) {
}
if ( tab instanceof Object ) {
tab.id = tab.id.toString();
}
callback(tab);
};
if ( tabId !== null ) {
if ( typeof tabId === 'string' ) {
tabId = parseInt(tabId, 10);
}
chrome.tabs.get(tabId, onTabReady);
return;
}
var onTabReceived = function(tabs) {
// https://code.google.com/p/chromium/issues/detail?id=410868#c8
if ( chrome.runtime.lastError ) {
}
var tab = null;
if ( Array.isArray(tabs) && tabs.length !== 0 ) {
tab = tabs[0];
tab.id = tab.id.toString();
}
callback(tab);
};
chrome.tabs.query({ active: true, currentWindow: true }, onTabReceived);
};
/******************************************************************************/
vAPI.tabs.getAll = function(callback) {
var onTabsReady = function(tabs) {
if ( Array.isArray(tabs) ) {
var i = tabs.length;
while ( i-- ) {
tabs[i].id = tabs[i].id.toString();
}
}
callback(tabs);
};
chrome.tabs.query({ url: '<all_urls>' }, onTabsReady);
};
/******************************************************************************/
// properties of the details object:
// url: 'URL', // the address that will be opened
// tabId: 1, // the tab is used if set, instead of creating a new one
// index: -1, // undefined: end of the list, -1: following tab, or after index
// active: false, // opens the tab in background - true and undefined: foreground
// select: true // if a tab is already opened with that url, then select it instead of opening a new one
vAPI.tabs.open = function(details) {
var targetURL = details.url;
if ( typeof targetURL !== 'string' || targetURL === '' ) {
return null;
}
// extension pages
if ( /^[\w-]{2,}:/.test(targetURL) !== true ) {
targetURL = vAPI.getURL(targetURL);
}
// dealing with Chrome's asynchronous API
var wrapper = function() {
if ( details.active === undefined ) {
details.active = true;
}
var subWrapper = function() {
var _details = {
url: targetURL,
active: !!details.active
};
// Opening a tab from incognito window won't focus the window
// in which the tab was opened
var focusWindow = function(tab) {
if ( tab.active ) {
chrome.windows.update(tab.windowId, { focused: true });
}
};
if ( !details.tabId ) {
if ( details.index !== undefined ) {
_details.index = details.index;
}
chrome.tabs.create(_details, focusWindow);
return;
}
// update doesn't accept index, must use move
chrome.tabs.update(parseInt(details.tabId, 10), _details, function(tab) {
// if the tab doesn't exist
if ( vAPI.lastError() ) {
chrome.tabs.create(_details, focusWindow);
} else if ( details.index !== undefined ) {
chrome.tabs.move(tab.id, {index: details.index});
}
});
};
if ( details.index !== -1 ) {
subWrapper();
return;
}
vAPI.tabs.get(null, function(tab) {
if ( tab ) {
details.index = tab.index + 1;
} else {
delete details.index;
}
subWrapper();
});
};
if ( !details.select ) {
wrapper();
return;
}
chrome.tabs.query({ url: targetURL }, function(tabs) {
var tab = tabs[0];
if ( tab ) {
chrome.tabs.update(tab.id, { active: true }, function(tab) {
chrome.windows.update(tab.windowId, { focused: true });
});
} else {
wrapper();
}
});
};
/******************************************************************************/
// Replace the URL of a tab. Noop if the tab does not exist.
vAPI.tabs.replace = function(tabId, url) {
var targetURL = url;
// extension pages
if ( /^[\w-]{2,}:/.test(targetURL) !== true ) {
targetURL = vAPI.getURL(targetURL);
}
if ( typeof tabId !== 'number' ) {
tabId = parseInt(tabId, 10);
if ( isNaN(tabId) ) {
return;
}
}
chrome.tabs.update(tabId, { url: targetURL }, function() {
// this prevent console error
if ( chrome.runtime.lastError ) {
return;
}
});
};
/******************************************************************************/
vAPI.tabs.remove = function(tabId) {
var onTabRemoved = function() {
if ( vAPI.lastError() ) {
}
};
chrome.tabs.remove(parseInt(tabId, 10), onTabRemoved);
};
/******************************************************************************/
vAPI.tabs.reload = function(tabId /*, flags*/) {
if ( typeof tabId === 'string' ) {
tabId = parseInt(tabId, 10);
}
if ( isNaN(tabId) ) {
return;
}
chrome.tabs.reload(tabId);
};
/******************************************************************************/
vAPI.tabs.injectScript = function(tabId, details, callback) {
var onScriptExecuted = function() {
// https://code.google.com/p/chromium/issues/detail?id=410868#c8
if ( chrome.runtime.lastError ) {
}
if ( typeof callback === 'function' ) {
callback();
}
};
if ( tabId ) {
tabId = parseInt(tabId, 10);
chrome.tabs.executeScript(tabId, details, onScriptExecuted);
} else {
chrome.tabs.executeScript(details, onScriptExecuted);
}
};
/******************************************************************************/
// Must read: https://code.google.com/p/chromium/issues/detail?id=410868#c8
// https://github.com/chrisaljoudi/uBlock/issues/19
// https://github.com/chrisaljoudi/uBlock/issues/207
// Since we may be called asynchronously, the tab id may not exist
// anymore, so this ensures it does still exist.
vAPI.setIcon = function(tabId, iconId, badge) {
tabId = parseInt(tabId, 10);
if ( isNaN(tabId) || tabId <= 0 ) {
return;
}
var onIconReady = function() {
if ( vAPI.lastError() ) {
return;
}
chrome.browserAction.setBadgeText({ tabId: tabId, text: badge });
if ( badge !== '' ) {
chrome.browserAction.setBadgeBackgroundColor({
tabId: tabId,
color: '#000'
});
}
};
var iconSelector = typeof iconId === 'number' ? iconId : 'off';
var iconPaths = {
'19': 'img/browsericons/icon19-' + iconSelector + '.png'/* ,
'38': 'img/browsericons/icon38-' + iconSelector + '.png' */
};
chrome.browserAction.setIcon({ tabId: tabId, path: iconPaths }, onIconReady);
};
/******************************************************************************/
/******************************************************************************/
vAPI.messaging = {
ports: {},
listeners: {},
defaultHandler: null,
NOOPFUNC: noopFunc,
UNHANDLED: 'vAPI.messaging.notHandled'
};
/******************************************************************************/
vAPI.messaging.listen = function(listenerName, callback) {
this.listeners[listenerName] = callback;
};
/******************************************************************************/
vAPI.messaging.onPortMessage = function(request, port) {
var callback = vAPI.messaging.NOOPFUNC;
if ( request.requestId !== undefined ) {
callback = CallbackWrapper.factory(port, request).callback;
}
// Specific handler
var r = vAPI.messaging.UNHANDLED;
var listener = vAPI.messaging.listeners[request.channelName];
if ( typeof listener === 'function' ) {
r = listener(request.msg, port.sender, callback);
}
if ( r !== vAPI.messaging.UNHANDLED ) {
return;
}
// Default handler
r = vAPI.messaging.defaultHandler(request.msg, port.sender, callback);
if ( r !== vAPI.messaging.UNHANDLED ) {
return;
}
console.error('µMatrix> messaging > unknown request: %o', request);
// Unhandled:
// Need to callback anyways in case caller expected an answer, or
// else there is a memory leak on caller's side
callback();
};
/******************************************************************************/
vAPI.messaging.onPortDisconnect = function(port) {
port.onDisconnect.removeListener(vAPI.messaging.onPortDisconnect);
port.onMessage.removeListener(vAPI.messaging.onPortMessage);
delete vAPI.messaging.ports[port.name];
};
/******************************************************************************/
vAPI.messaging.onPortConnect = function(port) {
port.onDisconnect.addListener(vAPI.messaging.onPortDisconnect);
port.onMessage.addListener(vAPI.messaging.onPortMessage);
vAPI.messaging.ports[port.name] = port;
};
/******************************************************************************/
vAPI.messaging.setup = function(defaultHandler) {
// Already setup?
if ( this.defaultHandler !== null ) {
return;
}
if ( typeof defaultHandler !== 'function' ) {
defaultHandler = function(){ return vAPI.messaging.UNHANDLED; };
}
this.defaultHandler = defaultHandler;
chrome.runtime.onConnect.addListener(this.onPortConnect);
};
/******************************************************************************/
vAPI.messaging.broadcast = function(message) {
var messageWrapper = {
broadcast: true,
msg: message
};
for ( var portName in this.ports ) {
if ( this.ports.hasOwnProperty(portName) === false ) {
continue;
}
this.ports[portName].postMessage(messageWrapper);
}
};
/******************************************************************************/
// This allows to avoid creating a closure for every single message which
// expects an answer. Having a closure created each time a message is processed
// has been always bothering me. Another benefit of the implementation here
// is to reuse the callback proxy object, so less memory churning.
//
// https://developers.google.com/speed/articles/optimizing-javascript
// "Creating a closure is significantly slower then creating an inner
// function without a closure, and much slower than reusing a static
// function"
//
// http://hacksoflife.blogspot.ca/2015/01/the-four-horsemen-of-performance.html
// "the dreaded 'uniformly slow code' case where every function takes 1%
// of CPU and you have to make one hundred separate performance optimizations
// to improve performance at all"
//
// http://jsperf.com/closure-no-closure/2
var CallbackWrapper = function(port, request) {
// No need to bind every single time
this.callback = this.proxy.bind(this);
this.messaging = vAPI.messaging;
this.init(port, request);
};
CallbackWrapper.junkyard = [];
CallbackWrapper.factory = function(port, request) {
var wrapper = CallbackWrapper.junkyard.pop();
if ( wrapper ) {
wrapper.init(port, request);
return wrapper;
}
return new CallbackWrapper(port, request);
};
CallbackWrapper.prototype.init = function(port, request) {
this.port = port;
this.request = request;
};
CallbackWrapper.prototype.proxy = function(response) {
// https://github.com/chrisaljoudi/uBlock/issues/383
if ( this.messaging.ports.hasOwnProperty(this.port.name) ) {
this.port.postMessage({
requestId: this.request.requestId,
channelName: this.request.channelName,
msg: response !== undefined ? response : null
});
}
// Mark for reuse
this.port = this.request = null;
CallbackWrapper.junkyard.push(this);
};
/******************************************************************************/
/******************************************************************************/
vAPI.net = {};
/******************************************************************************/
vAPI.net.registerListeners = function() {
var µm = µMatrix,
reNetworkURL = /^(?:https?|wss?):\/\//,
httpRequestHeadersJunkyard = [];
// Abstraction layer to deal with request headers
// >>>>>>>>
var httpRequestHeadersFactory = function(headers) {
var entry = httpRequestHeadersJunkyard.pop();
if ( entry ) {
return entry.init(headers);
}
return new HTTPRequestHeaders(headers);
};
var HTTPRequestHeaders = function(headers) {
this.init(headers);
};
HTTPRequestHeaders.prototype.init = function(headers) {
this.modified = false;
this.headers = headers;
return this;
};
HTTPRequestHeaders.prototype.dispose = function() {
var r = this.modified ? this.headers : null;
this.headers = null;
httpRequestHeadersJunkyard.push(this);
return r;
};
HTTPRequestHeaders.prototype.getHeader = function(target) {
var headers = this.headers;
var header, name;
var i = headers.length;
while ( i-- ) {
header = headers[i];
name = header.name.toLowerCase();
if ( name === target ) {
return header.value;
}
}
return '';
};
HTTPRequestHeaders.prototype.setHeader = function(target, value, create) {
var headers = this.headers;
var header, name;
var i = headers.length;
while ( i-- ) {
header = headers[i];
name = header.name.toLowerCase();
if ( name === target ) {
break;
}
}
if ( i < 0 && !create ) { // Header not found, don't add it
return false;
}
if ( i < 0 ) { // Header not found, add it
headers.push({ name: target, value: value });
} else if ( value === '' ) { // Header found, remove it
headers.splice(i, 1);
} else { // Header found, modify it
header.value = value;
}
this.modified = true;
return true;
};
// <<<<<<<<
// End of: Abstraction layer to deal with request headers
// Normalizing request types
// >>>>>>>>
var extToTypeMap = new Map([
['eot','font'],['otf','font'],['svg','font'],['ttf','font'],['woff','font'],['woff2','font'],
['mp3','media'],['mp4','media'],['webm','media'],
['gif','image'],['ico','image'],['jpeg','image'],['jpg','image'],['png','image'],['webp','image']
]);
var normalizeRequestDetails = function(details) {
details.tabId = details.tabId.toString();
var type = details.type;
if ( type === 'imageset' ) {
details.type = 'image';
return;
}
// The rest of the function code is to normalize request type
if ( type !== 'other' ) {
return;
}
if ( details.requestHeaders instanceof HTTPRequestHeaders ) {
if ( details.requestHeaders.getHeader('ping-to') !== '' ) {
details.type = 'ping';
return;
}
}
// Try to map known "extension" part of URL to request type.
var path = µm.URI.pathFromURI(details.url),
pos = path.indexOf('.', path.length - 6);
if ( pos !== -1 && (type = extToTypeMap.get(path.slice(pos + 1))) ) {
details.type = type;
}
};
// <<<<<<<<
// End of: Normalizing request types
// Network event handlers
// >>>>>>>>
var onBeforeRequestClient = this.onBeforeRequest.callback;
chrome.webRequest.onBeforeRequest.addListener(
function(details) {
if ( reNetworkURL.test(details.url) ) {
normalizeRequestDetails(details);
return onBeforeRequestClient(details);
}
},
//function(details) {
// quickProfiler.start('onBeforeRequest');
// var r = onBeforeRequest(details);
// quickProfiler.stop();
// return r;
//},
{
'urls': this.onBeforeRequest.urls || [ '<all_urls>' ],
'types': this.onBeforeRequest.types || undefined
},
this.onBeforeRequest.extra
);
var onBeforeSendHeadersClient = this.onBeforeSendHeaders.callback;
var onBeforeSendHeaders = function(details) {
details.requestHeaders = httpRequestHeadersFactory(details.requestHeaders);
normalizeRequestDetails(details);
var result = onBeforeSendHeadersClient(details);
if ( typeof result === 'object' ) {
return result;
}
var modifiedHeaders = details.requestHeaders.dispose();
if ( modifiedHeaders !== null ) {
return { requestHeaders: modifiedHeaders };
}
};
chrome.webRequest.onBeforeSendHeaders.addListener(
onBeforeSendHeaders,
{
'urls': this.onBeforeSendHeaders.urls || [ '<all_urls>' ],
'types': this.onBeforeSendHeaders.types || undefined
},
this.onBeforeSendHeaders.extra
);
var onHeadersReceivedClient = this.onHeadersReceived.callback;
var onHeadersReceived = function(details) {
normalizeRequestDetails(details);
return onHeadersReceivedClient(details);
};
chrome.webRequest.onHeadersReceived.addListener(
onHeadersReceived,
{
'urls': this.onHeadersReceived.urls || [ '<all_urls>' ],
'types': this.onHeadersReceived.types || undefined
},
this.onHeadersReceived.extra
);
// <<<<<<<<
// End of: Network event handlers
};
/******************************************************************************/
/******************************************************************************/
vAPI.contextMenu = {
create: function(details, callback) {
this.menuId = details.id;
this.callback = callback;
chrome.contextMenus.create(details);
chrome.contextMenus.onClicked.addListener(this.callback);
},
remove: function() {
chrome.contextMenus.onClicked.removeListener(this.callback);
chrome.contextMenus.remove(this.menuId);
}
};
/******************************************************************************/
vAPI.lastError = function() {
return chrome.runtime.lastError;
};
/******************************************************************************/
/******************************************************************************/
// This is called only once, when everything has been loaded in memory after
// the extension was launched. It can be used to inject content scripts
// in already opened web pages, to remove whatever nuisance could make it to
// the web pages before uBlock was ready.
vAPI.onLoadAllCompleted = function() {
};
/******************************************************************************/
/******************************************************************************/
vAPI.punycodeHostname = function(hostname) {
return hostname;
};
vAPI.punycodeURL = function(url) {
return url;
};
/******************************************************************************/
/******************************************************************************/
vAPI.browserData = {};
/******************************************************************************/
// https://developer.chrome.com/extensions/browsingData
vAPI.browserData.clearCache = function(callback) {
chrome.browsingData.removeCache({ since: 0 }, callback);
};
/******************************************************************************/
// Not supported on Chromium
vAPI.browserData.clearOrigin = function(domain, callback) {
// unsupported on Chromium
if ( typeof callback === 'function' ) {
callback(undefined);
}
};
/******************************************************************************/
/******************************************************************************/
// https://developer.chrome.com/extensions/cookies
vAPI.cookies = {};
/******************************************************************************/
vAPI.cookies.start = function() {
var reallyRemoved = {
'evicted': true,
'expired': true,
'explicit': true
};
var onChanged = function(changeInfo) {
if ( changeInfo.removed ) {
if ( reallyRemoved[changeInfo.cause] && typeof this.onRemoved === 'function' ) {
this.onRemoved(changeInfo.cookie);
}
return;
}
if ( typeof this.onChanged === 'function' ) {
this.onChanged(changeInfo.cookie);
}
};
chrome.cookies.onChanged.addListener(onChanged.bind(this));
};
/******************************************************************************/
vAPI.cookies.getAll = function(callback) {
chrome.cookies.getAll({}, callback);
};
/******************************************************************************/
vAPI.cookies.remove = function(details, callback) {
chrome.cookies.remove(details, callback || noopFunc);
};
/******************************************************************************/
/******************************************************************************/
vAPI.cloud = (function() {
var chunkCountPerFetch = 16; // Must be a power of 2
// Mind chrome.storage.sync.MAX_ITEMS (512 at time of writing)
var maxChunkCountPerItem = Math.floor(512 * 0.75) & ~(chunkCountPerFetch - 1);
// Mind chrome.storage.sync.QUOTA_BYTES_PER_ITEM (8192 at time of writing)
var maxChunkSize = Math.floor(chrome.storage.sync.QUOTA_BYTES_PER_ITEM * 0.75);
// Mind chrome.storage.sync.QUOTA_BYTES_PER_ITEM (8192 at time of writing)
var maxStorageSize = chrome.storage.sync.QUOTA_BYTES;
var options = {
defaultDeviceName: window.navigator.platform,
deviceName: window.localStorage.getItem('deviceName') || ''
};
// This is used to find out a rough count of how many chunks exists:
// We "poll" at specific index in order to get a rough idea of how
// large is the stored string.
// This allows reading a single item with only 2 sync operations -- a
// good thing given chrome.storage.syncMAX_WRITE_OPERATIONS_PER_MINUTE
// and chrome.storage.syncMAX_WRITE_OPERATIONS_PER_HOUR.
var getCoarseChunkCount = function(dataKey, callback) {
var bin = {};
for ( var i = 0; i < maxChunkCountPerItem; i += 16 ) {
bin[dataKey + i.toString()] = '';
}
chrome.storage.sync.get(bin, function(bin) {
if ( chrome.runtime.lastError ) {
callback(0, chrome.runtime.lastError.message);
return;
}
var chunkCount = 0;
for ( var i = 0; i < maxChunkCountPerItem; i += 16 ) {
if ( bin[dataKey + i.toString()] === '' ) {
break;
}
chunkCount = i + 16;
}
callback(chunkCount);
});
};
var deleteChunks = function(dataKey, start) {
var keys = [];
// No point in deleting more than:
// - The max number of chunks per item
// - The max number of chunks per storage limit
var n = Math.min(
maxChunkCountPerItem,
Math.ceil(maxStorageSize / maxChunkSize)
);
for ( var i = start; i < n; i++ ) {
keys.push(dataKey + i.toString());
}
chrome.storage.sync.remove(keys);
};
var start = function(/* dataKeys */) {
};
var push = function(dataKey, data, callback) {
var bin = {
'source': options.deviceName || options.defaultDeviceName,
'tstamp': Date.now(),
'data': data,
'size': 0
};
bin.size = JSON.stringify(bin).length;
var item = JSON.stringify(bin);
// Chunkify taking into account QUOTA_BYTES_PER_ITEM:
// https://developer.chrome.com/extensions/storage#property-sync
// "The maximum size (in bytes) of each individual item in sync
// "storage, as measured by the JSON stringification of its value
// "plus its key length."
bin = {};
var chunkCount = Math.ceil(item.length / maxChunkSize);
for ( var i = 0; i < chunkCount; i++ ) {
bin[dataKey + i.toString()] = item.substr(i * maxChunkSize, maxChunkSize);
}
bin[dataKey + i.toString()] = ''; // Sentinel
chrome.storage.sync.set(bin, function() {
var errorStr;
if ( chrome.runtime.lastError ) {
errorStr = chrome.runtime.lastError.message;
}
callback(errorStr);
// Remove potentially unused trailing chunks
deleteChunks(dataKey, chunkCount);
});
};
var pull = function(dataKey, callback) {
var assembleChunks = function(bin) {
if ( chrome.runtime.lastError ) {
callback(null, chrome.runtime.lastError.message);
return;
}
// Assemble chunks into a single string.
var json = [], jsonSlice;
var i = 0;
for (;;) {
jsonSlice = bin[dataKey + i.toString()];
if ( jsonSlice === '' ) {
break;
}
json.push(jsonSlice);
i += 1;
}
var entry = null;
try {
entry = JSON.parse(json.join(''));
} catch(ex) {
}
callback(entry);
};
var fetchChunks = function(coarseCount, errorStr) {
if ( coarseCount === 0 || typeof errorStr === 'string' ) {
callback(null, errorStr);
return;
}
var bin = {};
for ( var i = 0; i < coarseCount; i++ ) {
bin[dataKey + i.toString()] = '';
}
chrome.storage.sync.get(bin, assembleChunks);
};
getCoarseChunkCount(dataKey, fetchChunks);
};
var getOptions = function(callback) {
if ( typeof callback !== 'function' ) {
return;
}
callback(options);
};
var setOptions = function(details, callback) {
if ( typeof details !== 'object' || details === null ) {
return;
}
if ( typeof details.deviceName === 'string' ) {
window.localStorage.setItem('deviceName', details.deviceName);
options.deviceName = details.deviceName;
}
getOptions(callback);
};
return {
start: start,
push: push,
pull: pull,
getOptions: getOptions,
setOptions: setOptions
};
})();
/******************************************************************************/
/******************************************************************************/
})();
/******************************************************************************/