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