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108 lines
3.5 KiB
JavaScript
108 lines
3.5 KiB
JavaScript
/**
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* abstractFilesystemAccess.js: Abstraction layer for file access.
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* This is currently only implemented for FirefoxOS, but could be extended to
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* Cordova, Electron or other ways to directly browse and read files from the
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* filesystem.
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* It is unfortunately not possible to do that inside a standard browser
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* (even inside an extension).
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*
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* Copyright 2014 Kiwix developers
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* License GPL v3:
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*
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* This file is part of Kiwix.
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*
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* Kiwix 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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*
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* Kiwix 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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*
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* You should have received a copy of the GNU General Public License
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* along with Kiwix (file LICENSE-GPLv3.txt). If not, see <http://www.gnu.org/licenses/>
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*/
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'use strict';
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define([], function() {
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/**
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* Storage implemented by Firefox OS
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*
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* @typedef StorageFirefoxOS
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* @property {DeviceStorage} _storage DeviceStorage
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* @property {String} storageName Name of the storage
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*/
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/**
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* Creates an abstraction layer around the FirefoxOS storage.
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* @param storage FirefoxOS DeviceStorage object
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*/
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function StorageFirefoxOS(storage) {
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this._storage = storage;
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this.storageName = storage.storageName;
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};
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/**
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* Access the given file.
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* @param {String} path absolute path to the file
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* @return {Promise} Promise which is resolved with a HTML5 file object and
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* rejected with an error message.
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*/
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StorageFirefoxOS.prototype.get = function(path) {
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var that = this;
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return new Promise(function (resolve, reject){
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var request = that._storage.get(path);
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request.onsuccess = function() { resolve(this.result); };
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request.onerror = function() { reject(this.error.name); };
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});
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};
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// We try to match both a standalone ZIM file (.zim) or
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// the first file of a split ZIM files collection (.zimaa)
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var regexpZIMFileName = /\.zim(aa)?$/i;
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/**
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* Searches for archive files or directories.
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* @return {Promise} Promise which is resolved with an array of
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* paths and rejected with an error message.
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*/
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StorageFirefoxOS.prototype.scanForArchives = function() {
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var that = this;
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return new Promise(function (resolve, reject){
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var directories = [];
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var cursor = that._storage.enumerate();
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cursor.onerror = function() {
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reject(cursor.error);
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};
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cursor.onsuccess = function() {
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if (!cursor.result) {
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resolve(directories);
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return;
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}
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var file = cursor.result;
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if (regexpZIMFileName.test(file.name)) {
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directories.push(file.name);
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}
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cursor.continue();
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};
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});
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};
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/**
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* Browse a path through DeviceStorage API
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* @param path Path where to look for files
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* @return {DOMCursor} Cursor of files found in given path
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*/
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StorageFirefoxOS.prototype.enumerate = function(path) {
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return this._storage.enumerate();
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};
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return {
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StorageFirefoxOS: StorageFirefoxOS
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};
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});
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