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392
gaia/apps/music/js/shims/device-storage.js
Executable file
392
gaia/apps/music/js/shims/device-storage.js
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/* global fetch */
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(function() {
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'use strict';
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if (navigator.getDeviceStorages &&
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navigator.getDeviceStorage) {
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return;
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}
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const PRELOAD_FILES = [
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'/media/1-01%20Whole%20Lotta%20Love.mp3',
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'/media/1-02%20What%20Is%20and%20What%20Should%20Never%20Be.mp3',
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'/media/1-03%20The%20Lemon%20Song.mp3',
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'/media/1-04%20Thank%20You.mp3',
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'/media/1-05%20Heartbreaker.mp3',
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'/media/1-06%20Living%20Loving%20Maid%20(She\'s%20Just%20a%20Woman).mp3',
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'/media/1-07%20Ramble%20On.mp3',
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'/media/1-08%20Moby%20Dick.mp3',
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'/media/1-09%20Bring%20It%20On%20Home.mp3',
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'/media/soundgarden/1-01%20Let%20Me%20Drown.mp3',
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'/media/soundgarden/1-02%20My%20Wave.mp3',
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'/media/soundgarden/1-03%20Fell%20On%20Black%20Days.mp3',
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'/media/soundgarden/1-04%20Mailman.mp3',
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'/media/soundgarden/1-05%20Superunknown.mp3',
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'/media/soundgarden/1-06%20Head%20Down.mp3',
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'/media/soundgarden/1-07%20Black%20Hole%20Sun.mp3',
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'/media/soundgarden/1-08%20Spoonman.mp3',
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'/media/soundgarden/1-09%20Limo%20Wreck.mp3',
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'/media/soundgarden/1-10%20The%20Day%20I%20Tried%20to%20Live.mp3',
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'/media/soundgarden/1-11%20Kickstand.mp3',
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'/media/soundgarden/1-12%20Fresh%20Tendrils.mp3',
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'/media/soundgarden/1-13%204th%20of%20July.mp3',
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'/media/soundgarden/1-14%20Half.mp3',
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'/media/soundgarden/1-15%20Like%20Suicide.mp3',
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'/media/soundgarden/1-16%20She%20Likes%20Surprises.mp3'
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];
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navigator.getDeviceStorages = navigator.getDeviceStorages || getDeviceStorages;
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navigator.getDeviceStorage = navigator.getDeviceStorage || getDeviceStorage;
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var deviceStorages = {};
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function getDeviceStorages(storageName) {
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return [getDeviceStorage(storageName)];
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}
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function getDeviceStorage(storageName) {
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if (deviceStorages[storageName]) {
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return deviceStorages[storageName];
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}
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return (deviceStorages[storageName] = new DeviceStorage(storageName));
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}
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function DeviceStorage(storageName) {
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this.storageName = storageName;
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this.canBeFormatted = false;
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this.canBeMounted = false;
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this.canBeShared = false;
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this.default = true;
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this.isRemovable = false;
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this.onchange = null;
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this.addEventListener('change', (evt) => {
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if (typeof this.onchange === 'function') {
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this.onchange(evt);
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}
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});
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this._files = [];
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var preloadNextFile = (function(index) {
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if (index >= PRELOAD_FILES.length) {
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return;
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}
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var path = PRELOAD_FILES[index];
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fetch(path)
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.then((result) => {
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result.blob().then((file) => {
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preloadNextFile(++index);
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file.name = decodeURIComponent(path);
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file.lastModifiedDate = new Date();
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this._files.push(file);
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this.dispatchEvent('change', {
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reason: 'created',
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path: file.name
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});
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this.dispatchEvent('change', {
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reason: 'modified',
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path: file.name
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});
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});
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})
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.catch((error) => {
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preloadNextFile(++index);
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console.log('Unable to retrieve preloaded file', path, error);
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});
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}).bind(this);
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preloadNextFile(0);
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}
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DeviceStorage.prototype = new EventTarget();
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DeviceStorage.prototype.constructor = DeviceStorage;
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DeviceStorage.prototype.add = function(file) {
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if (file instanceof Blob) {
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return this.addNamed(file, '/' + this.storageName + '/' +
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generateRandomFileName());
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}
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throw 'TypeError: Argument 1 of DeviceStorage.add does not implement ' +
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'interface Blob.';
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};
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DeviceStorage.prototype.addNamed = function(file, name) {
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if (file instanceof Blob) {
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return new DOMRequest((success, error) => {
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var exists = !!this._files.find(f => f.name === name);
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if (exists) {
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return error({ name: 'Unknown', message: '' });
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}
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file.lastModifiedDate = new Date();
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file.name = name;
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this._files.push(file);
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this.dispatchEvent('change', {
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reason: 'created',
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path: file.name
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});
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this.dispatchEvent('change', {
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reason: 'modified',
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path: file.name
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});
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success(name);
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});
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}
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throw 'TypeError: Argument 1 of DeviceStorage.addNamed does not implement '+
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'interface Blob.';
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};
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DeviceStorage.prototype.appendNamed = function() {
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};
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DeviceStorage.prototype.available = function() {
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return new DOMRequest(success => success('available'));
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};
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DeviceStorage.prototype.delete = function(fileName) {
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return new DOMRequest((success, error) => {
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var file = this._files.find(f => f.name === fileName);
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if (file) {
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this._files.splice(this._files.indexOf(file), 1);
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this.dispatchEvent('change', {
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reason: 'deleted',
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path: file.name
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});
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success();
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return;
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}
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error({ name: 'Unknown', message: '' });
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});
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};
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DeviceStorage.prototype.enumerate = function(path, options) {
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return new DOMRequest((success, error) => {
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var files = [];
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if (typeof path === 'object') {
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options = path;
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path = '';
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}
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if (!path) {
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options = options || {};
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path = '';
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}
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this._files.forEach((file) => {
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if (options.since instanceof Date &&
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file.lastModifiedDate < options.since) {
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return;
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}
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if (file.name.startsWith(path)) {
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files.push(file);
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}
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});
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if (files.length === 0) {
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return error({ name: 'Unknown', message: '' });
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}
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success(files);
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});
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};
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DeviceStorage.prototype.enumerateEditable = function() {
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// NOOP
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};
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DeviceStorage.prototype.format = function() {
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return new DOMRequest(success => success('formatting'));
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};
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DeviceStorage.prototype.freeSpace = function() {
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return new DOMRequest(success => success(1000000000));
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};
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DeviceStorage.prototype.get = function(fileName) {
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return new DOMRequest((success, error) => {
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var file = this._files.find(f => f.name === fileName);
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if (file) {
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success(file);
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return;
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}
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error({ name: 'Unknown', message: '' });
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});
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};
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DeviceStorage.prototype.getEditable = function() {
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// NOOP
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};
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DeviceStorage.prototype.getRoot = function() {
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// NOOP
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};
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DeviceStorage.prototype.mount = function() {
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return new DOMRequest(success => success('mounting'));
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};
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DeviceStorage.prototype.storageStatus = function() {
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return new DOMRequest(success => success('Mounted'));
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};
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DeviceStorage.prototype.unmount = function() {
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return new DOMRequest(success => success('unmounting'));
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};
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DeviceStorage.prototype.usedSpace = function() {
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return new DOMRequest(success => success(
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this._files.reduce((a, b) => (a.size || a) + b.size))
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);
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};
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function DOMRequest(callback) {
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var success = (result) => {
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this.readyState = 'done';
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this.result = result;
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if (typeof this.onsuccess === 'function') {
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this.onsuccess();
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}
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};
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var error = (error) => {
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this.readyState = 'done';
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this.error = error;
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if (typeof this.onerror === 'function') {
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this.onerror();
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}
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};
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this.readyState = 'pending';
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this.onsuccess = null;
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this.onerror = null;
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if (typeof callback === 'function') {
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setTimeout(() => callback(success, error));
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}
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}
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DOMRequest.prototype.constructor = DOMRequest;
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function DOMCursor(callback) {
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var success = (results) => {
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this.readyState = 'done';
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this._results = results;
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this._index = -1;
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this.continue();
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};
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var error = (error) => {
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this.readyState = 'done';
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this.error = error;
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if (typeof this.onerror === 'function') {
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this.onerror();
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}
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};
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this.readyState = 'pending';
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this.done = false;
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this.onsuccess = null;
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this.onerror = null;
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if (typeof callback === 'function') {
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setTimeout(() => callback(success, error));
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}
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}
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DOMCursor.prototype = new DOMRequest();
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DOMCursor.prototype.constructor = DOMCursor;
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DOMCursor.prototype.continue = function() {
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if (this._index >= this._results.length - 1) {
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return;
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}
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this.result = this._results[++this._index];
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if (this._index >= this._results.length - 1) {
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this.done = true;
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}
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if (typeof this.onsuccess === 'function') {
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this.onsuccess();
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}
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};
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function EventTarget(object) {
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if (typeof object !== 'object') {
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return;
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}
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for (var property in object) {
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this[property] = object[property];
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}
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}
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EventTarget.prototype.constructor = EventTarget;
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EventTarget.prototype.dispatchEvent = function(name, data) {
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var events = this._events || {};
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var listeners = events[name] || [];
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listeners.forEach(listener => listener.call(this, data));
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};
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EventTarget.prototype.addEventListener = function(name, listener) {
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var events = this._events = this._events || {};
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var listeners = events[name] = events[name] || [];
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if (listeners.find(fn => fn === listener)) {
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return;
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}
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listeners.push(listener);
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};
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EventTarget.prototype.removeEventListener = function(name, listener) {
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var events = this._events || {};
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var listeners = events[name] || [];
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for (var i = listeners.length - 1; i >= 0; i--) {
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if (listeners[i] === listener) {
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listeners.splice(i, 1);
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return;
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}
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}
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};
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function generateRandomFileName() {
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var fileName = '';
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for (var i = 0; i < 8; i++) {
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fileName += Math.floor((1 + Math.random()) * 0x10000)
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.toString(16).substr(1);
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}
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return fileName;
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}
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})();
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