1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
6 * @fileoverview Provides a representation of a web request sender, and
7 * utility functions for creating them.
14 * tlsChannelId: (string|undefined),
15 * tabId: (number|undefined)
21 * Creates an object representing the sender's origin, and, if available,
23 * @param {MessageSender} messageSender The message sender.
24 * @return {?WebRequestSender} The sender's origin and tab, or null if the
27 function createSenderFromMessageSender(messageSender) {
28 var origin = getOriginFromUrl(/** @type {string} */ (messageSender.url));
35 if (messageSender.tlsChannelId) {
36 sender.tlsChannelId = messageSender.tlsChannelId;
38 if (messageSender.tab) {
39 sender.tabId = messageSender.tab.id;
45 * Checks whether the given tab could have sent a message from the given
47 * @param {Tab} tab The tab to match
48 * @param {string} origin The origin to check.
49 * @return {Promise} A promise resolved with the tab id if it the tab could,
50 * have sent the request, and rejected if it can't.
52 function tabMatchesOrigin(tab, origin) {
53 // If the tab's origin matches, trust that the request came from this tab.
54 if (getOriginFromUrl(tab.url) == origin) {
55 return Promise.resolve(tab.id);
57 return Promise.reject(false);
61 * Attempts to ensure that the tabId of the sender is set, using chrome.tabs
63 * @param {WebRequestSender} sender The request sender.
64 * @return {Promise} A promise resolved once the tabId retrieval is done.
65 * The promise is rejected if the tabId is untrustworthy, e.g. if the
66 * user rapidly switched tabs.
68 function getTabIdWhenPossible(sender) {
70 // Already got it? Done.
71 return Promise.resolve(true);
72 } else if (!chrome.tabs) {
73 // Can't get it? Done. (This happens to packaged apps, which can't access
75 return Promise.resolve(true);
77 return new Promise(function(resolve, reject) {
78 chrome.tabs.query({active: true, lastFocusedWindow: true},
86 tabMatchesOrigin(tab, sender.origin).then(function(tabId) {
90 // Didn't match? Check if the debugger is open.
91 if (tab.url.indexOf('chrome-devtools://') != 0) {
95 // Debugger active: find first tab with the sender's origin.
96 chrome.tabs.query({active: true}, function(tabs) {
103 for (var i = 0; i < tabs.length; i++) {
105 tabMatchesOrigin(tab, sender.origin).then(function(tabId) {
106 sender.tabId = tabId;
109 if (++numRejected >= tabs.length) {
110 // None matches: reject.
123 * Checks whether the given tab is in the foreground, i.e. is the active tab
124 * of the focused window.
125 * @param {number} tabId The tab id to check.
126 * @return {Promise<boolean>} A promise for the result of the check.
128 function tabInForeground(tabId) {
129 return new Promise(function(resolve, reject) {
130 if (!chrome.tabs || !chrome.tabs.get) {
134 if (!chrome.windows || !chrome.windows.get) {
138 chrome.tabs.get(tabId, function(tab) {
139 if (chrome.runtime.lastError) {
147 chrome.windows.get(tab.windowId, function(aWindow) {
148 resolve(aWindow && aWindow.focused);