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// 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.
// Declare an OAuth2 class to handle retrieval/storage of an OAuth2 token.
//
// Ideally, this should implement the OAuth2 PostMessage flow to avoid needing
// to copy and paste a code, but that does not support extension URL schemes
// quite yet. Instead, we currently use the native app flow with an
// authorization code that the user must cut/paste.
var remoting = chrome.extension.getBackgroundPage().remoting;
function OAuth2() {
this.OAUTH2_REFRESH_TOKEN_NAME = 'oauth2_refresh_token';
this.client_id = encodeURIComponent(
'440925447803-m890isgsr23kdkcu2erd4mirnrjalf98.' +
'apps.googleusercontent.com');
this.client_secret = encodeURIComponent('TgKrL73H2kJe6Ir0ufp7bf6e');
this.scope = encodeURIComponent(
'https://www.googleapis.com/auth/chromoting ' +
'https://www.googleapis.com/auth/googletalk');
this.redirect_uri = encodeURIComponent('urn:ietf:wg:oauth:2.0:oob');
}
OAuth2.prototype.isAuthenticated = function() {
if(this.getRefreshToken()) {
return true;
}
return false;
}
OAuth2.prototype.clear = function() {
remoting.removeItem(this.OAUTH2_REFRESH_TOKEN_NAME);
delete this.access_token;
delete this.access_token_expiration;
}
OAuth2.prototype.setRefreshToken = function(token) {
remoting.setItem(this.OAUTH2_REFRESH_TOKEN_NAME, token);
}
OAuth2.prototype.getRefreshToken = function(token) {
return remoting.getItem(this.OAUTH2_REFRESH_TOKEN_NAME);
}
OAuth2.prototype.setAccessToken = function(token, expiration) {
this.access_token = token;
// Offset by 30 seconds to account for RTT issues.
// TODO(ajwong): See if this is necessary, or of the protocol already
// accounts for RTT.
this.access_token_expiration = expiration - 30000;
}
OAuth2.prototype.needsNewAccessToken = function() {
if (!this.isAuthenticated()) {
throw "Not Authenticated.";
}
if (!this.access_token) {
return true;
}
if (Date.now() > this.access_token_expiration) {
return true;
}
return false;
}
OAuth2.prototype.getAccessToken = function() {
if (this.needsNewAccessToken()) {
throw "Access Token expired.";
}
return this.access_token;
}
OAuth2.prototype.refreshAccessToken = function(on_done) {
if (!this.isAuthenticated()) {
throw "Not Authenticated.";
}
var xhr = new XMLHttpRequest();
var that = this;
xhr.onreadystatechange = function() {
if (xhr.readyState != 4) {
return;
}
if (xhr.status == 200) {
tokens = JSON.parse(xhr.responseText);
that.setAccessToken(tokens['access_token'],
tokens['expires_in'] * 1000 + Date.now());
} else {
console.log("Refresh access token failed. Status: " + xhr.status +
" response: " + xhr.responseText);
}
on_done();
};
xhr.open('POST', 'https://accounts.google.com/o/oauth2/token', true);
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
var post_data = 'client_id=' + this.client_id
+ '&client_secret=' + this.client_secret
+ '&refresh_token=' + encodeURIComponent(this.getRefreshToken())
+ '&grant_type=refresh_token';
xhr.send(post_data);
}
OAuth2.prototype.openOAuth2Window = function() {
var GET_CODE_URL = 'https://accounts.google.com/o/oauth2/auth?'
+ 'client_id=' + this.client_id
+ '&redirect_uri=' + this.redirect_uri
+ '&scope=' + this.scope
+ '&response_type=code';
window.open(GET_CODE_URL);
}
OAuth2.prototype.exchangeCodeForToken = function(code, on_done) {
var xhr = new XMLHttpRequest();
var that = this;
xhr.onreadystatechange = function() {
if (xhr.readyState != 4) {
return;
}
if (xhr.status == 200) {
tokens = JSON.parse(xhr.responseText);
that.setRefreshToken(tokens['refresh_token']);
that.setAccessToken(tokens['access_token'],
tokens['expires_in'] + Date.now());
} else {
console.log("Code exchnage failed. Status: " + xhr.status +
" response: " + xhr.responseText);
}
on_done();
};
xhr.open('POST', 'https://accounts.google.com/o/oauth2/token', true);
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
var post_data = 'client_id=' + this.client_id
+ '&client_secret=' + this.client_secret
+ '&redirect_uri=' + this.redirect_uri
+ '&code=' + encodeURIComponent(code)
+ '&grant_type=authorization_code';
xhr.send(post_data);
}
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