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250 </script> 251 252 <div class="g-unit" id="gc-pagecontent"> 253 <div id="pageTitle"> 254 <h1 class="page_title">Tutorial: OAuth</h1> 255 </div> 256 <!-- TABLE OF CONTENTS --> 257 <div id="toc"> 258 <h2>Contents</h2> 259 <ol> 260 <li> 261 <a href="#requirements">Requirements</a> 262 <ol> 263 <li style="display: none; "> 264 <a>h3Name</a> 265 </li> 266 </ol> 267 </li><li> 268 <a href="#getting-started">Getting started</a> 269 <ol> 270 <li style="display: none; "> 271 <a>h3Name</a> 272 </li> 273 </ol> 274 </li><li> 275 <a href="#oauth-dance">The OAuth dance in an extension</a> 276 <ol> 277 <li> 278 <a href="#set-code">Setup code</a> 279 </li><li> 280 <a href="#request-token">Fetching and authorizing a request token</a> 281 </li><li> 282 <a href="#signed-requests">Sending signed API requests</a> 283 </li> 284 </ol> 285 </li><li> 286 <a href="#sample-code">Sample code</a> 287 <ol> 288 <li style="display: none; "> 289 <a>h3Name</a> 290 </li> 291 </ol> 292 </li> 293 <li style="display: none; "> 294 <a href="#apiReference">API reference</a> 295 <ol> 296 <li> 297 <a href="#properties">Properties</a> 298 <ol> 299 <li> 300 <a href="#property-anchor">propertyName</a> 301 </li> 302 </ol> 303 </li> 304 <li> 305 <a>Methods</a> 306 <ol> 307 <li> 308 <a href="#method-anchor">methodName</a> 309 </li> 310 </ol> 311 </li> 312 <li> 313 <a>Events</a> 314 <ol> 315 <li> 316 <a href="#event-anchor">eventName</a> 317 </li> 318 </ol> 319 </li> 320 <li> 321 <a href="#types">Types</a> 322 <ol> 323 <li> 324 <a href="#id-anchor">id</a> 325 </li> 326 </ol> 327 </li> 328 </ol> 329 </li> 330 </ol> 331 </div> 332 <!-- /TABLE OF CONTENTS --> 333 334 <!-- Standard content lead-in for experimental API pages --> 335 <p id="classSummary" style="display: none; "> 336 For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page. 337 </p> 338 339 <!-- STATIC CONTENT PLACEHOLDER --> 340 <div id="static"><div id="pageData-name" class="pageData">Tutorial: OAuth</div> 341<div id="pageData-showTOC" class="pageData">true</div> 342 343<p> 344<a href="http://oauth.net/">OAuth</a> is an open protocol that aims to standardize the way desktop and web applications access a user's private data. OAuth provides a mechanism for users to grant access to private data without sharing their private credentials (username/password). Many sites have started enabling APIs to use OAuth because of its security and standard set of libraries. 345</p> 346<p> 347This tutorial will walk you through the necessary steps for creating a Google Chrome Extension that uses OAuth to access an API. It leverages a library that you can reuse in your extensions. 348</p> 349<p> 350This tutorial uses the <a href="http://code.google.com/apis/documents/">Google Documents List Data API</a> as an example OAuth-enabled API endpoint. 351</p> 352 353<h2 id="requirements">Requirements</h2> 354 355<p> 356This tutorial expects that you have some experience writing extensions for Google Chrome and some familiarity with the <a href="http://code.google.com/apis/accounts/docs/OAuth.html">3-legged OAuth</a> flow. Although you don’t need a background in the <a href="http://code.google.com/apis/documents/">Google Documents List Data API</a> (or the other <a href="http://code.google.com/apis/gdata/">Google Data APIs</a> for that matter), having a understanding of the protocol may be helpful. 357</p> 358 359<h2 id="getting-started">Getting started</h2> 360 361<p> 362First, copy over the three library files from the Chromium source tree at <a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/extensions/oauth_contacts/">.../examples/extensions/oauth_contacts/</a>: 363</p> 364<ul> 365<li><strong><a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/extensions/oauth_contacts/chrome_ex_oauth.html?revision=34725&content-type=text/plain">chrome_ex_oauth.html</a></strong> - interstitial page for the oauth_callback URL</li> 366<li><strong><a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/extensions/oauth_contacts/chrome_ex_oauth.js?content-type=text/plain">chrome_ex_oauth.js</a></strong> - core OAuth library</li> 367<li><strong><a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/extensions/oauth_contacts/chrome_ex_oauthsimple.js?content-type=text/plain">chrome_ex_oauthsimple.js</a></strong> - helpful wrapper for chrome_ex_oauth.js</li> 368</ul> 369 370<p>Place the three library files in the root of your extension directory (or wherever your JavaScript is stored). Then include both .js files in your background page in the following order:</p> 371 372<pre><script type="text/javascript" src="chrome_ex_oauthsimple.js"></script> 373<script type="text/javascript" src="chrome_ex_oauth.js"></script> 374</pre> 375 376<p>Your background page will manage the OAuth flow.</p> 377 378<h2 id="oauth-dance">The OAuth dance in an extension</h2> 379 380<p> 381If you are familiar with the OAuth protocol, you'll recall that the OAuth dance consists of three steps: 382</p> 383 384<ol> 385<li>fetching an initial request token</li> 386<li>having the user authorize the request token</li> 387<li>fetching an access token</li> 388</ol> 389 390<p>In the context of an extension, this flow gets a bit tricky. Namely, there is no established consumer key/secret between the service provider and the application. That is, there is no web application URL for the user to be redirected to after the approval process. 391</p> 392 393<p> 394Luckily, Google and a few other companies have been working on an <a href="http://code.google.com/apis/accounts/docs/OAuthForInstalledApps.html">OAuth for installed applications</a> solution that you can use from an extension environment. In the installed applications OAuth dance, the consumer key/secret are ‘anonymous’/’anonymous’ and you provide an <em>application name</em> for the user to grant access to (instead of an application URL). The end result is the same: your background page requests the initial token, opens a new tab to the approval page, and finally makes the asynchronous call for the access token. 395</p> 396 397<h3 id="set-code">Setup code</h3> 398 399<p>To initialize the library, create a <code>ChromeExOAuth</code> object in the background page:</p> 400 401<pre>var oauth = ChromeExOAuth.initBackgroundPage({ 402 'request_url': <OAuth request URL>, 403 'authorize_url': <OAuth authorize URL>, 404 'access_url': <OAuth access token URL>, 405 'consumer_key': <OAuth consumer key>, 406 'consumer_secret': <OAuth consumer secret>, 407 'scope': <scope of data access, not used by all OAuth providers>, 408 'app_name': <application name, not used by all OAuth providers> 409}); 410</pre> 411 412<p>In the case of the Documents List API and Google’s OAuth endpoints, a possible initialization may be:</p> 413 414<pre>var oauth = ChromeExOAuth.initBackgroundPage({ 415 'request_url': 'https://www.google.com/accounts/OAuthGetRequestToken', 416 'authorize_url': 'https://www.google.com/accounts/OAuthAuthorizeToken', 417 'access_url': 'https://www.google.com/accounts/OAuthGetAccessToken', 418 'consumer_key': 'anonymous', 419 'consumer_secret': 'anonymous', 420 'scope': 'https://docs.google.com/feeds/', 421 'app_name': 'My Google Docs Extension' 422}); 423</pre> 424 425<h3 id="request-token">Fetching and authorizing a request token</h3> 426 427<p> 428Once you have your background page set up, call the <code>authorize()</code> function to begin the OAuth dance and redirect the user to the OAuth provider. The client library abstracts most of this process, so all you need to do is pass a callback to the <code>authorize()</code> function, and a new tab will open and redirect the user. 429</p> 430 431<pre>oauth.authorize(function() { 432 // ... Ready to fetch private data ... 433}); 434</pre> 435 436<p> 437You don't need to provide any additional logic for storing the token and secret, as this library already stores these values in the browser’s <code>localStorage</code>. If the library already has an access token stored for the current scope, then no tab will be opened. In either case, the callback will be called. 438</p> 439 440<h3 id="signed-requests">Sending signed API requests</h3> 441 442<p> 443Once your specified callback is executed, call the <code>sendSignedRequest()</code> function to send signed requests to your API endpoint(s). <code>sendSignedRequest()</code> takes three arguments: a URI, a callback function, and an optional parameter object. The callback is passed two arguments: the response text and the <code>XMLHttpRequest</code> object that was used to make the request. 444</p> 445 446<p>This example sends an HTTP <code>GET</code>:</p> 447 448<pre>function callback(resp, xhr) { 449 // ... Process text response ... 450}; 451 452function onAuthorized() { 453 var url = 'https://docs.google.com/feeds/default/private/full'; 454 var request = { 455 'method': 'GET', 456 'parameters': {'alt': 'json'} 457 }; 458 459 // Send: GET https://docs.google.com/feeds/default/private/full?alt=json 460 oauth.sendSignedRequest(url, callback, request); 461}; 462 463oauth.authorize(onAuthorized); 464</pre> 465 466<p>A more complex example using an HTTP <code>POST</code> might look like this:</p> 467 468<pre>function onAuthorized() { 469 var url = 'https://docs.google.com/feeds/default/private/full'; 470 var request = { 471 'method': 'POST', 472 'headers': { 473 'GData-Version': '3.0', 474 'Content-Type': 'application/atom+xml' 475 }, 476 'parameters': { 477 'alt': 'json' 478 }, 479 'body': 'Data to send' 480 }; 481 482 // Send: POST https://docs.google.com/feeds/default/private/full?alt=json 483 oauth.sendSignedRequest(url, callback, request); 484}; 485</pre> 486 487<p> 488By default, the <code>sendSignedRequest()</code> function sends the <code>oauth_*</code> parameters in the URL (by calling <code>oauth.signURL()</code>). If you prefer to send the <code>oauth_*</code> parameters in the <code>Authorization</code> header (or need direct access to the generated header), use <code>getAuthorizationHeader()</code>. Its arguments are a URI, an HTTP method, and an optional object of URL query parameters as key/value pairs. 489</p> 490 491<p>Here is the example above using <code>getAuthorizationHeader()</code> and an <code>XMLHttpRequest</code> object:</p> 492 493<pre>function stringify(parameters) { 494 var params = []; 495 for(var p in parameters) { 496 params.push(encodeURIComponent(p) + '=' + 497 encodeURIComponent(parameters[p])); 498 } 499 return params.join('&'); 500}; 501 502function onAuthorized() { 503 var method = 'POST'; 504 var url = 'https://docs.google.com/feeds/default/private/full'; 505 var params = {'alt': 'json'}; 506 507 var xhr = new XMLHttpRequest(); 508 xhr.onreadystatechange = function(data) { 509 callback(xhr, data); 510 }; 511 xhr.setRequestHeader('GData-Version', '3.0'); 512 xhr.setRequestHeader('Content-Type', 'application/atom+xml'); 513 xhr.setRequestHeader('Authorization', oauth.getAuthorizationHeader(url, method, params)); 514 xhr.open(method, url + '?' + stringify(params), true); 515 516 xhr.send('Data to send'); 517}; 518</pre> 519 520<h2 id="sample-code">Sample code</h2> 521 522<p> 523Sample extensions that use these techniques are available in the Chromium source tree: 524</p> 525 526<ul> 527<li><a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/extensions/gdocs/">.../examples/extensions/gdocs/</a></li> 528<li><a href="http://src.chromium.org/viewvc/chrome/trunk/src/chrome/common/extensions/docs/examples/extensions/oauth_contacts/">.../examples/extensions/oauth_contacts/</a></li> 529</ul> 530 531</div> 532 533 <!-- API PAGE --> 534 <div class="apiPage" style="display: none; "> 535 <a name="apiReference"></a> 536 <h2>API reference: chrome.apiname </h2> 537 538 <!-- PROPERTIES --> 539 <div class="apiGroup"> 540 <a name="properties"></a> 541 <h3 id="properties">Properties</h3> 542 543 <div> 544 <a></a> 545 <h4>getLastError</h4> 546 <div class="summary"> 547 <!-- Note: intentionally longer 80 columns --> 548 <span>chrome.extension</span><span>lastError</span> 549 </div> 550 <div> 551 </div> 552 </div> 553 554 </div> <!-- /apiGroup --> 555 556 <!-- METHODS --> 557 <div id="methodsTemplate" class="apiGroup"> 558 <a></a> 559 <h3>Methods</h3> 560 561 <!-- iterates over all functions --> 562 <div class="apiItem"> 563 <a></a> <!-- method-anchor --> 564 <h4>method name</h4> 565 566 <div class="summary"><span>void</span> 567 <!-- Note: intentionally longer 80 columns --> 568 <span>chrome.module.methodName</span>(<span><span>, </span><span></span> 569 <var><span></span></var></span>)</div> 570 571 <div class="description"> 572 <p class="todo">Undocumented.</p> 573 <p> 574 A description from the json schema def of the function goes here. 575 </p> 576 577 <!-- PARAMETERS --> 578 <h4>Parameters</h4> 579 <dl> 580 <div> 581 <div> 582 </div> 583 </div> 584 </dl> 585 586 <!-- RETURNS --> 587 <h4>Returns</h4> 588 <dl> 589 <div> 590 <div> 591 </div> 592 </div> 593 </dl> 594 595 <!-- CALLBACK --> 596 <div> 597 <div> 598 <h4>Callback function</h4> 599 <p> 600 The callback <em>parameter</em> should specify a function 601 that looks like this: 602 </p> 603 <p> 604 If you specify the <em>callback</em> parameter, it should 605 specify a function that looks like this: 606 </p> 607 608 <!-- Note: intentionally longer 80 columns --> 609 <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre> 610 <dl> 611 <div> 612 <div> 613 </div> 614 </div> 615 </dl> 616 </div> 617 </div> 618 619 <!-- MIN_VERSION --> 620 <p> 621 This function was added in version <b><span></span></b>. 622 If you require this function, the manifest key 623 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 624 can ensure that your extension won't be run in an earlier browser version. 625 </p> 626 </div> <!-- /description --> 627 628 </div> <!-- /apiItem --> 629 630 </div> <!-- /apiGroup --> 631 632 <!-- EVENTS --> 633 <div id="eventsTemplate" class="apiGroup"> 634 <a></a> 635 <h3>Events</h3> 636 <!-- iterates over all events --> 637 <div class="apiItem"> 638 <a></a> 639 <h4>event name</h4> 640 641 <div class="summary"> 642 <!-- Note: intentionally longer 80 columns --> 643 <span class="subdued">chrome.bookmarks</span><span>onEvent</span><span class="subdued">.addListener</span>(function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>); 644 </div> 645 646 <div class="description"> 647 <p class="todo">Undocumented.</p> 648 <p> 649 A description from the json schema def of the event goes here. 650 </p> 651 652 <!-- PARAMETERS --> 653 <div> 654 <h4>Parameters</h4> 655 <dl> 656 <div> 657 <div> 658 </div> 659 </div> 660 </dl> 661 </div> 662 </div> <!-- /decription --> 663 664 </div> <!-- /apiItem --> 665 666 </div> <!-- /apiGroup --> 667 668 <!-- TYPES --> 669 <div class="apiGroup"> 670 <a name="types"></a> 671 <h3 id="types">Types</h3> 672 673 <!-- iterates over all types --> 674 <div class="apiItem"> 675 <a></a> 676 <h4>type name</h4> 677 678 <div> 679 </div> 680 681 </div> <!-- /apiItem --> 682 683 </div> <!-- /apiGroup --> 684 685 </div> <!-- /apiPage --> 686 </div> <!-- /gc-pagecontent --> 687 </div> <!-- /g-section --> 688 </div> <!-- /codesiteContent --> 689 <div id="gc-footer" --=""> 690 <div class="text"> 691 <p> 692 Except as otherwise <a href="http://code.google.com/policies.html#restrictions">noted</a>, 693 the content of this page is licensed under the <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons 694 Attribution 3.0 License</a>, and code samples are licensed under the 695 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD License</a>. 696 </p> 697 <p> 698 ©2011 Google 699 </p> 700 701<!-- begin analytics --> 702<script src="http://www.google-analytics.com/urchin.js" type="text/javascript"></script> 703<script src="http://www.google-analytics.com/ga.js" type="text/javascript"></script> 704 705<script type="text/javascript"> 706 // chrome doc tracking 707 try { 708 var engdocs = _gat._getTracker("YT-10763712-2"); 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