a2ba1b8189
Removes the following as they unnecessary /* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
286 lines
10 KiB
JavaScript
286 lines
10 KiB
JavaScript
/*
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Copyright 2013 Mozilla Foundation
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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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http://www.apache.org/licenses/LICENSE-2.0
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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, URL, getViewerURL, Features */
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(function() {
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'use strict';
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if (!chrome.streamsPrivate) {
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// Aww, PDF.js is still not whitelisted... See http://crbug.com/326949
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console.warn('streamsPrivate not available, PDF from FTP or POST ' +
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'requests will not be displayed using this extension! ' +
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'See http://crbug.com/326949');
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chrome.runtime.onMessage.addListener(function(message, sender,
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sendResponse) {
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if (message && message.action === 'getPDFStream') {
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sendResponse();
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}
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});
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return;
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}
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//
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// Stream URL storage manager
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//
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// Hash map of "<tab id>": { "<pdf url>": ["<stream url>", ...], ... }
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var urlToStream = {};
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chrome.streamsPrivate.onExecuteMimeTypeHandler.addListener(handleStream);
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// Chrome before 27 does not support tabIds on stream events.
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var streamSupportsTabId = true;
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// "tabId" used for Chrome before 27.
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var STREAM_NO_TABID = 0;
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function hasStream(tabId, pdfUrl) {
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var streams = urlToStream[streamSupportsTabId ? tabId : STREAM_NO_TABID];
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return (streams && streams[pdfUrl] && streams[pdfUrl].length > 0);
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}
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/**
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* Get stream URL for a given tabId and PDF url. The retrieved stream URL
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* will be removed from the list.
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* @return {object} An object with property url (= blob:-URL) and
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* property contentLength (= expected size)
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*/
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function getStream(tabId, pdfUrl) {
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if (!streamSupportsTabId) {
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tabId = STREAM_NO_TABID;
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}
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if (hasStream(tabId, pdfUrl)) {
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var streamInfo = urlToStream[tabId][pdfUrl].shift();
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if (urlToStream[tabId][pdfUrl].length === 0) {
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delete urlToStream[tabId][pdfUrl];
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if (Object.keys(urlToStream[tabId]).length === 0) {
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delete urlToStream[tabId];
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}
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}
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return streamInfo;
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}
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}
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function setStream(tabId, pdfUrl, streamUrl, expectedSize) {
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tabId = tabId || STREAM_NO_TABID;
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if (!urlToStream[tabId]) {
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urlToStream[tabId] = {};
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}
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if (!urlToStream[tabId][pdfUrl]) {
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urlToStream[tabId][pdfUrl] = [];
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}
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urlToStream[tabId][pdfUrl].push({
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streamUrl: streamUrl,
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contentLength: expectedSize
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});
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}
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// http://crbug.com/276898 - the onExecuteMimeTypeHandler event is sometimes
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// dispatched in the wrong incognito profile. To work around the bug, transfer
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// the stream information from the incognito session when the bug is detected.
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function transferStreamToIncognitoProfile(tabId, pdfUrl) {
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if (chrome.extension.inIncognitoContext) {
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console.log('Already within incognito profile. Aborted stream transfer.');
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return;
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}
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var streamInfo = getStream(tabId, pdfUrl);
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if (!streamInfo) {
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return;
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}
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console.log('Attempting to transfer stream info to a different profile...');
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var itemId = 'streamInfo:' + window.performance.now();
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var items = {};
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items[itemId] = {
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tabId: tabId,
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pdfUrl: pdfUrl,
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streamUrl: streamInfo.streamUrl,
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contentLength: streamInfo.contentLength
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};
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// The key will be removed whenever an incognito session is started,
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// or when an incognito session is active.
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chrome.storage.local.set(items, function() {
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chrome.extension.isAllowedIncognitoAccess(function(isAllowedAccess) {
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if (!isAllowedAccess) {
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// If incognito is disabled, forget about the stream.
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console.warn('Incognito is disabled, unexpected unknown stream.');
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chrome.storage.local.remove(items);
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}
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});
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});
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}
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if (chrome.extension.inIncognitoContext) {
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var importStream = function(itemId, streamInfo) {
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if (itemId.lastIndexOf('streamInfo:', 0) !== 0) {
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return;
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}
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console.log('Importing stream info from non-incognito profile',
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streamInfo);
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handleStream('', streamInfo.pdfUrl, streamInfo.streamUrl,
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streamInfo.tabId, streamInfo.contentLength);
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chrome.storage.local.remove(itemId);
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};
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var handleStorageItems = function(items) {
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Object.keys(items).forEach(function(itemId) {
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var item = items[itemId];
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if (item.oldValue && !item.newValue) {
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return; // storage remove event
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}
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if (item.newValue) {
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item = item.newValue; // storage setter event
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}
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importStream(itemId, item);
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});
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};
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// Parse information that was set before the event pages were ready.
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chrome.storage.local.get(null, handleStorageItems);
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chrome.storage.onChanged.addListener(handleStorageItems);
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}
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// End of work-around for crbug 276898
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chrome.runtime.onMessage.addListener(function(message, sender, sendResponse) {
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if (message && message.action === 'getPDFStream') {
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var pdfUrl = message.data;
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var streamInfo = getStream(sender.tab.id, pdfUrl) || {};
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sendResponse({
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streamUrl: streamInfo.streamUrl,
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contentLength: streamInfo.contentLength,
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extensionSupportsFTP: Features.extensionSupportsFTP
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});
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}
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});
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//
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// PDF detection and activation of PDF viewer.
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//
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/**
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* Callback for when we receive a stream
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*
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* @param mimeType {string} The mime type of the incoming stream
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* @param pdfUrl {string} The full URL to the file
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* @param streamUrl {string} The url pointing to the open stream
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* @param tabId {number} The ID of the tab in which the stream has been opened
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* (undefined before Chrome 27, http://crbug.com/225605)
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* @param expectedSize {number} The expected content length of the stream.
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* (added in Chrome 29, http://crbug.com/230346)
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*/
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function handleStream(mimeType, pdfUrl, streamUrl, tabId, expectedSize) {
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if (typeof mimeType === 'object') {
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// API change: argument list -> object, see crbug.com/345882
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// documentation: chrome/common/extensions/api/streams_private.idl
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var streamInfo = mimeType;
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mimeType = streamInfo.mimeType;
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pdfUrl = streamInfo.originalUrl;
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streamUrl = streamInfo.streamUrl;
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tabId = streamInfo.tabId;
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expectedSize = streamInfo.expectedContentSize;
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}
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console.log('Intercepted ' + mimeType + ' in tab ' + tabId + ' with URL ' +
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pdfUrl + '\nAvailable as: ' + streamUrl);
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streamSupportsTabId = typeof tabId === 'number';
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setStream(tabId, pdfUrl, streamUrl, expectedSize);
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if (!tabId) { // Chrome doesn't set the tabId before v27
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// PDF.js targets Chrome 28+ because of fatal bugs in incognito mode
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// for older versions of Chrome. So, don't bother implementing a fallback.
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// For those who are interested, either loop through all tabs, or use the
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// webNavigation.onBeforeNavigate event to map pdfUrls to tab + frame IDs.
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return;
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}
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// Check if the frame has already been rendered.
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chrome.webNavigation.getAllFrames({
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tabId: tabId
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}, function(details) {
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if (details) {
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details = details.filter(function(frame) {
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return (frame.url === pdfUrl);
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});
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if (details.length > 0) {
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if (details.length !== 1) {
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// (Rare case) Multiple frames with same URL.
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// TODO(rob): Find a better way to handle this case
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// (e.g. open in new tab).
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console.warn('More than one frame found for tabId ' + tabId +
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' with URL ' + pdfUrl + '. Using first frame.');
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}
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details = details[0];
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details = {
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tabId: tabId,
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frameId: details.frameId,
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url: details.url
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};
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handleWebNavigation(details);
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} else {
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console.warn('No webNavigation frames found for tabId ' + tabId);
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}
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} else {
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console.warn('Unable to get frame information for tabId ' + tabId);
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// This branch may occur when a new incognito session is launched.
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// The event is dispatched in the non-incognito session while it should
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// be dispatched in the incognito session. See http://crbug.com/276898
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transferStreamToIncognitoProfile(tabId, pdfUrl);
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}
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});
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}
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/**
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* This method is called when the chrome.streamsPrivate API has intercepted
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* the PDF stream. This method detects such streams, finds the frame where
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* the request was made, and loads the viewer in that frame.
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*
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* @param details {object}
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* @param details.tabId {number} The ID of the tab
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* @param details.url {string} The URL being navigated when the error
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* occurred.
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* @param details.frameId {number} 0 indicates the navigation happens in
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* the tab content window; a positive value
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* indicates navigation in a subframe.
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*/
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function handleWebNavigation(details) {
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var tabId = details.tabId;
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var frameId = details.frameId;
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var pdfUrl = details.url;
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if (!hasStream(tabId, pdfUrl)) {
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console.log('No PDF stream found in tab ' + tabId + ' for ' + pdfUrl);
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return;
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}
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var viewerUrl = getViewerURL(pdfUrl);
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if (frameId === 0) { // Main frame
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console.log('Going to render PDF Viewer in main frame for ' + pdfUrl);
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chrome.tabs.update(tabId, {
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url: viewerUrl
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});
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} else {
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console.log('Going to render PDF Viewer in sub frame for ' + pdfUrl);
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// Non-standard Chrome API. chrome.tabs.executeScriptInFrame and docs
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// is available at https://github.com/Rob--W/chrome-api
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chrome.tabs.executeScriptInFrame(tabId, {
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frameId: frameId,
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code: 'location.href = ' + JSON.stringify(viewerUrl) + ';'
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}, function(result) {
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if (!result) { // Did the tab disappear? Is the frame inaccessible?
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console.warn('Frame not found, viewer not rendered in tab ' + tabId);
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}
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});
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}
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}
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})();
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