Yury Delendik
10 years ago
4 changed files with 3 additions and 163 deletions
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/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
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/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */ |
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/* Copyright 2012 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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/* jshint esnext:true */ |
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/* globals Components, Services, XPCOMUtils, NetUtil, dump */ |
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'use strict'; |
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var EXPORTED_SYMBOLS = ['PdfRedirector']; |
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const Cc = Components.classes; |
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const Ci = Components.interfaces; |
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const Cr = Components.results; |
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const Cu = Components.utils; |
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const PDF_CONTENT_TYPE = 'application/pdf'; |
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const FIREFOX_ID = '{ec8030f7-c20a-464f-9b0e-13a3a9e97384}'; |
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Cu.import('resource://gre/modules/XPCOMUtils.jsm'); |
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Cu.import('resource://gre/modules/Services.jsm'); |
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Cu.import('resource://gre/modules/NetUtil.jsm'); |
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function getDOMWindow(aChannel) { |
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var requestor = aChannel.notificationCallbacks ? |
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aChannel.notificationCallbacks : |
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aChannel.loadGroup.notificationCallbacks; |
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var win = requestor.getInterface(Components.interfaces.nsIDOMWindow); |
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return win; |
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} |
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function getObjectUrl(window) { |
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// PlayPreview overlay "belongs" to the embed/object tag and consists of DIV
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// and IFRAME. Starting from IFRAME and looking for first object tag.
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var element = window.frameElement, containerElement; |
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if (!element) { |
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return null; // iframe tag
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} |
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var tagName = element.nodeName; |
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while (tagName !== 'EMBED' && tagName !== 'OBJECT') { |
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containerElement = element; |
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element = element.parentNode; |
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if (!element) { |
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return null; // object tag was not found
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} |
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tagName = element.nodeName; |
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} |
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// Checking if overlay is a proper PlayPreview overlay.
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if (element.displayedType !== element.TYPE_NULL || |
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element.pluginFallbackType !== element.PLUGIN_PLAY_PREVIEW) { |
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return null; // invalid plugin element overlay state
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} |
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for (var i = 0; i < element.children.length; i++) { |
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if (element.children[i] === containerElement) { |
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return null; // invalid plugin element overlay
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} |
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} |
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return element.srcURI.spec; |
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} |
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function PdfRedirector() { |
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} |
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PdfRedirector.prototype = { |
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// properties required for XPCOM registration:
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classID: Components.ID('{8cbfd8d0-2042-4976-b3ef-d9dee1efb975}'), |
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classDescription: 'pdf.js Redirector', |
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contractID: |
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'@mozilla.org/streamconv;1?from=application/x-moz-playpreview-pdfjs&to=*/*', |
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QueryInterface: XPCOMUtils.generateQI([ |
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Ci.nsIStreamConverter, |
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Ci.nsIStreamListener, |
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Ci.nsIRequestObserver |
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]), |
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// nsIStreamConverter::convert
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convert: function(aFromStream, aFromType, aToType, aCtxt) { |
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throw Cr.NS_ERROR_NOT_IMPLEMENTED; |
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}, |
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// nsIStreamConverter::asyncConvertData
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asyncConvertData: function(aFromType, aToType, aListener, aCtxt) { |
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// Store the listener passed to us
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this.listener = aListener; |
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}, |
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// nsIStreamListener::onDataAvailable
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onDataAvailable: function(aRequest, aContext, aInputStream, aOffset, aCount) { |
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// Do nothing since all the data loading is handled by the viewer.
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}, |
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// nsIRequestObserver::onStartRequest
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onStartRequest: function(aRequest, aContext) { |
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// Setup the request so we can use it below.
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aRequest.QueryInterface(Ci.nsIChannel); |
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// Cancel the request so the viewer can handle it.
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aRequest.cancel(Cr.NS_BINDING_ABORTED); |
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var domWindow = getDOMWindow(aRequest); |
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var pdfUrl = getObjectUrl(domWindow); |
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if (!pdfUrl) { |
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Services.console.logStringMessage( |
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'PdfRedirector.js: PDF location is not specified for OBJECT/EMBED tag'); |
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return; |
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} |
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// Create a new channel that is viewer loaded as a resource.
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var ioService = Services.io; |
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var channel = ioService.newChannel(pdfUrl, null, null); |
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channel.loadGroup = aRequest.loadGroup; |
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channel.asyncOpen(this.listener, aContext); |
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}, |
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// nsIRequestObserver::onStopRequest
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onStopRequest: function(aRequest, aContext, aStatusCode) { |
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// Do nothing
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} |
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}; |
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