/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* Copyright 2013 Mozilla Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* globals chrome, PDFJS, PDFView */ 'use strict'; var ChromeCom = (function ChromeComClosure() { var ChromeCom = {}; /** * Creates an event that the extension is listening for and will * asynchronously respond by calling the callback. * * @param {String} action The action to trigger. * @param {String} data Optional data to send. * @param {Function} callback Optional response callback that will be called * with one data argument. When the request cannot be handled, the callback * is immediately invoked with no arguments. */ ChromeCom.request = function ChromeCom_request(action, data, callback) { var message = { action: action, data: data }; if (!chrome.runtime) { console.error('chrome.runtime is undefined.'); if (callback) { callback(); } } else if (callback) { chrome.runtime.sendMessage(message, callback); } else { chrome.runtime.sendMessage(message); } }; /** * Opens a PDF file with the PDF viewer. * * @param {String} file Absolute URL of PDF file. */ ChromeCom.openPDFFile = function ChromeCom_openPDFFile(file) { // Expand drive:-URLs to filesystem URLs (Chrome OS) file = file.replace(/^drive:/i, 'filesystem:' + location.origin + '/external/'); ChromeCom.request('getPDFStream', file, function(response) { if (response) { // We will only get a response when the streamsPrivate API is available. var isFTPFile = /^ftp:/i.test(file); var streamUrl = response.streamUrl; if (streamUrl) { console.log('Found data stream for ' + file); PDFView.open(streamUrl, 0, undefined, undefined, { length: response.contentLength }); PDFView.setTitleUsingUrl(file); return; } if (isFTPFile && !response.extensionSupportsFTP) { // Stream not found, and it's loaded from FTP. // When the browser does not support loading ftp resources over // XMLHttpRequest, just reload the page. // NOTE: This will not lead to an infinite redirect loop, because // if the file exists, then the streamsPrivate API will capture the // stream and send back the response. If the stream does not exist, // a "Webpage not available" error will be shown (not the PDF Viewer). location.replace(file); return; } } if (/^filesystem:/.test(file) && !PDFJS.disableWorker) { // The security origin of filesystem:-URLs are not preserved when the // URL is passed to a Web worker, (http://crbug.com/362061), so we have // to create an intermediate blob:-URL as a work-around. var resolveLocalFileSystemURL = window.resolveLocalFileSystemURL || window.webkitResolveLocalFileSystemURL; resolveLocalFileSystemURL(file, function onResolvedFSURL(fileEntry) { fileEntry.file(function(fileObject) { var blobUrl = URL.createObjectURL(fileObject); PDFView.open(blobUrl, 0, undefined, undefined, { length: fileObject.size }); }); }, function onFileSystemError(error) { // This should not happen. When it happens, just fall back to the // usual way of getting the File's data (via the Web worker). console.warn('Cannot resolve file ' + file + ', ' + error.name + ' ' + error.message); PDFView.open(file, 0); }); return; } PDFView.open(file, 0); }); }; return ChromeCom; })();