| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /** |
| * @fileoverview |
| * OAuth2 class that handles retrieval/storage of an OAuth2 token. |
| * |
| * Uses a content script to trampoline the OAuth redirect page back into the |
| * extension context. This works around the lack of native support for |
| * chrome-extensions in OAuth2. |
| */ |
| |
| 'use strict'; |
| |
| /** @suppress {duplicate} */ |
| var remoting = remoting || {}; |
| |
| /** @type {remoting.OAuth2} */ |
| remoting.oauth2 = null; |
| |
| |
| /** @constructor */ |
| remoting.OAuth2 = function() { |
| }; |
| |
| // Constants representing keys used for storing persistent state. |
| /** @private */ |
| remoting.OAuth2.prototype.KEY_REFRESH_TOKEN_ = 'oauth2-refresh-token'; |
| /** @private */ |
| remoting.OAuth2.prototype.KEY_ACCESS_TOKEN_ = 'oauth2-access-token'; |
| |
| // Constants for parameters used in retrieving the OAuth2 credentials. |
| /** @private */ remoting.OAuth2.prototype.CLIENT_ID_ = |
| '440925447803-2pi3v45bff6tp1rde2f7q6lgbor3o5uj.' + |
| 'apps.googleusercontent.com'; |
| /** @private */ |
| remoting.OAuth2.prototype.CLIENT_SECRET_ = 'W2ieEsG-R1gIA4MMurGrgMc_'; |
| /** @private */ remoting.OAuth2.prototype.SCOPE_ = |
| 'https://www.googleapis.com/auth/chromoting ' + |
| 'https://www.googleapis.com/auth/googletalk ' + |
| 'https://www.googleapis.com/auth/userinfo#email'; |
| /** @private */ remoting.OAuth2.prototype.REDIRECT_URI_ = |
| 'https://talkgadget.google.com/talkgadget/blank'; |
| /** @private */ remoting.OAuth2.prototype.OAUTH2_TOKEN_ENDPOINT_ = |
| 'https://accounts.google.com/o/oauth2/token'; |
| |
| /** @return {boolean} True if the app is already authenticated. */ |
| remoting.OAuth2.prototype.isAuthenticated = function() { |
| if (this.getRefreshToken()) { |
| return true; |
| } |
| return false; |
| }; |
| |
| /** |
| * Removes all storage, and effectively unauthenticates the user. |
| * |
| * @return {void} Nothing. |
| */ |
| remoting.OAuth2.prototype.clear = function() { |
| window.localStorage.removeItem(this.KEY_REFRESH_TOKEN_); |
| this.clearAccessToken(); |
| }; |
| |
| /** |
| * @param {string} token The new refresh token. |
| * @return {void} Nothing. |
| */ |
| remoting.OAuth2.prototype.setRefreshToken = function(token) { |
| window.localStorage.setItem(this.KEY_REFRESH_TOKEN_, escape(token)); |
| this.clearAccessToken(); |
| }; |
| |
| /** @return {?string} The refresh token, if authenticated, or NULL. */ |
| remoting.OAuth2.prototype.getRefreshToken = function() { |
| var value = window.localStorage.getItem(this.KEY_REFRESH_TOKEN_); |
| if (typeof value == 'string') { |
| return unescape(value); |
| } |
| return null; |
| }; |
| |
| /** |
| * @param {string} token The new access token. |
| * @param {number} expiration Expiration time in milliseconds since epoch. |
| * @return {void} Nothing. |
| */ |
| remoting.OAuth2.prototype.setAccessToken = function(token, expiration) { |
| var access_token = {'token': token, 'expiration': expiration}; |
| window.localStorage.setItem(this.KEY_ACCESS_TOKEN_, |
| JSON.stringify(access_token)); |
| }; |
| |
| /** |
| * Returns the current access token, setting it to a invalid value if none |
| * existed before. |
| * |
| * @private |
| * @return {{token: string, expiration: number}} The current access token, or |
| * an invalid token if not authenticated. |
| */ |
| remoting.OAuth2.prototype.getAccessTokenInternal_ = function() { |
| if (!window.localStorage.getItem(this.KEY_ACCESS_TOKEN_)) { |
| // Always be able to return structured data. |
| this.setAccessToken('', 0); |
| } |
| var accessToken = window.localStorage.getItem(this.KEY_ACCESS_TOKEN_); |
| if (typeof accessToken == 'string') { |
| var result = JSON.parse(accessToken); |
| if ('token' in result && 'expiration' in result) { |
| return /** @type {{token: string, expiration: number}} */ result; |
| } |
| } |
| console.log('Invalid access token stored.'); |
| return {'token': '', 'expiration': 0}; |
| }; |
| |
| /** |
| * Returns true if the access token is expired, or otherwise invalid. |
| * |
| * Will throw if !isAuthenticated(). |
| * |
| * @return {boolean} True if a new access token is needed. |
| */ |
| remoting.OAuth2.prototype.needsNewAccessToken = function() { |
| if (!this.isAuthenticated()) { |
| throw 'Not Authenticated.'; |
| } |
| var access_token = this.getAccessTokenInternal_(); |
| if (!access_token['token']) { |
| return true; |
| } |
| if (Date.now() > access_token['expiration']) { |
| return true; |
| } |
| return false; |
| }; |
| |
| /** |
| * Returns the current access token. |
| * |
| * Will throw if !isAuthenticated() or needsNewAccessToken(). |
| * |
| * @return {string} The access token. |
| */ |
| remoting.OAuth2.prototype.getAccessToken = function() { |
| if (this.needsNewAccessToken()) { |
| throw 'Access Token expired.'; |
| } |
| return this.getAccessTokenInternal_()['token']; |
| }; |
| |
| /** @return {void} Nothing. */ |
| remoting.OAuth2.prototype.clearAccessToken = function() { |
| window.localStorage.removeItem(this.KEY_ACCESS_TOKEN_); |
| }; |
| |
| /** |
| * Update state based on token response from the OAuth2 /token endpoint. |
| * |
| * @private |
| * @param {XMLHttpRequest} xhr The XHR object for this request. |
| * @return {void} Nothing. |
| */ |
| remoting.OAuth2.prototype.processTokenResponse_ = function(xhr) { |
| if (xhr.status == 200) { |
| var tokens = JSON.parse(xhr.responseText); |
| if ('refresh_token' in tokens) { |
| this.setRefreshToken(tokens['refresh_token']); |
| } |
| |
| // Offset by 120 seconds so that we can guarantee that the token |
| // we return will be valid for at least 2 minutes. |
| // If the access token is to be useful, this object must make some |
| // guarantee as to how long the token will be valid for. |
| // The choice of 2 minutes is arbitrary, but that length of time |
| // is part of the contract satisfied by callWithToken(). |
| // Offset by a further 30 seconds to account for RTT issues. |
| this.setAccessToken(tokens['access_token'], |
| (tokens['expires_in'] - (120 + 30)) * 1000 + Date.now()); |
| } else { |
| console.log('Failed to get tokens. Status: ' + xhr.status + |
| ' response: ' + xhr.responseText); |
| } |
| }; |
| |
| /** |
| * Asynchronously retrieves a new access token from the server. |
| * |
| * Will throw if !isAuthenticated(). |
| * |
| * @param {function(XMLHttpRequest): void} onDone Callback to invoke on |
| * completion. |
| * @return {void} Nothing. |
| */ |
| remoting.OAuth2.prototype.refreshAccessToken = function(onDone) { |
| if (!this.isAuthenticated()) { |
| throw 'Not Authenticated.'; |
| } |
| |
| var parameters = { |
| 'client_id': this.CLIENT_ID_, |
| 'client_secret': this.CLIENT_SECRET_, |
| 'refresh_token': this.getRefreshToken(), |
| 'grant_type': 'refresh_token' |
| }; |
| |
| /** @type {remoting.OAuth2} */ |
| var that = this; |
| /** @param {XMLHttpRequest} xhr The XHR reply. */ |
| var processTokenResponse = function(xhr) { |
| that.processTokenResponse_(xhr); |
| onDone(xhr); |
| }; |
| remoting.xhr.post(this.OAUTH2_TOKEN_ENDPOINT_, |
| processTokenResponse, |
| parameters); |
| }; |
| |
| /** |
| * Redirect page to get a new OAuth2 Refresh Token. |
| * |
| * @return {void} Nothing. |
| */ |
| remoting.OAuth2.prototype.doAuthRedirect = function() { |
| var GET_CODE_URL = 'https://accounts.google.com/o/oauth2/auth?' + |
| remoting.xhr.urlencodeParamHash({ |
| 'client_id': this.CLIENT_ID_, |
| 'redirect_uri': this.REDIRECT_URI_, |
| 'scope': this.SCOPE_, |
| 'response_type': 'code' |
| }); |
| window.location.replace(GET_CODE_URL); |
| }; |
| |
| /** |
| * Asynchronously exchanges an authorization code for a refresh token. |
| * |
| * @param {string} code The new refresh token. |
| * @param {function(XMLHttpRequest):void} onDone Callback to invoke on |
| * completion. |
| * @return {void} Nothing. |
| */ |
| remoting.OAuth2.prototype.exchangeCodeForToken = function(code, onDone) { |
| var parameters = { |
| 'client_id': this.CLIENT_ID_, |
| 'client_secret': this.CLIENT_SECRET_, |
| 'redirect_uri': this.REDIRECT_URI_, |
| 'code': code, |
| 'grant_type': 'authorization_code' |
| }; |
| |
| /** @type {remoting.OAuth2} */ |
| var that = this; |
| /** @param {XMLHttpRequest} xhr The XHR reply. */ |
| var processTokenResponse = function(xhr) { |
| that.processTokenResponse_(xhr); |
| onDone(xhr); |
| }; |
| remoting.xhr.post(this.OAUTH2_TOKEN_ENDPOINT_, |
| processTokenResponse, |
| parameters); |
| }; |
| |
| /** |
| * Call myfunc with an access token as the only parameter. |
| * |
| * This will refresh the access token if necessary. If the access token |
| * cannot be refreshed, an error is thrown. |
| * |
| * The access token will remain valid for at least 2 minutes. |
| * |
| * @param {function(string):void} myfunc |
| * Function to invoke with access token. |
| * @return {void} Nothing. |
| */ |
| remoting.OAuth2.prototype.callWithToken = function(myfunc) { |
| /** @type {remoting.OAuth2} */ |
| var that = this; |
| if (remoting.oauth2.needsNewAccessToken()) { |
| remoting.oauth2.refreshAccessToken(function() { |
| if (remoting.oauth2.needsNewAccessToken()) { |
| // If we still need it, we're going to infinite loop. |
| throw 'Unable to get access token.'; |
| } |
| myfunc(that.getAccessToken()); |
| }); |
| return; |
| } |
| |
| myfunc(this.getAccessToken()); |
| }; |