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You'll need run chrome with --allow-file-access-from-files. 23 </div> 24 <!-- SUBTEMPLATES: DO NOT MOVE FROM THIS LOCATION --> 25 <!-- In particular, sub-templates that recurse, must be used by allowing 26 jstemplate to make a copy of the template in this section which 27 are not operated on by way of the jsskip="true" --> 28 <div style="display:none"> 29 30 <!-- VALUE --> 31 <div id="valueTemplate"> 32 <dt> 33 <var>paramName</var> 34 <em> 35 36 <!-- TYPE --> 37 <div style="display:inline"> 38 ( 39 <span class="optional">optional</span> 40 <span class="enum">enumerated</span> 41 <span id="typeTemplate"> 42 <span> 43 <a> Type</a> 44 </span> 45 <span> 46 <span> 47 array of <span><span></span></span> 48 </span> 49 <span>paramType</span> 50 <span></span> 51 </span> 52 </span> 53 ) 54 </div> 55 56 </em> 57 </dt> 58 <dd class="todo"> 59 Undocumented. 60 </dd> 61 <dd> 62 Description of this parameter from the json schema. 63 </dd> 64 <dd> 65 This parameter was added in version 66 <b><span></span></b>. 67 You must omit this parameter in earlier versions, 68 and you may omit it in any version. If you require this 69 parameter, the manifest key 70 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 71 can ensure that your extension won't be run in an earlier browser version. 72 </dd> 73 74 <!-- OBJECT PROPERTIES --> 75 <dd> 76 <dl> 77 <div> 78 <div> 79 </div> 80 </div> 81 </dl> 82 </dd> 83 84 <!-- OBJECT METHODS --> 85 <dd> 86 <div></div> 87 </dd> 88 89 <!-- OBJECT EVENT FIELDS --> 90 <dd> 91 <div></div> 92 </dd> 93 94 <!-- FUNCTION PARAMETERS --> 95 <dd> 96 <div></div> 97 </dd> 98 99 </div> <!-- /VALUE --> 100 101 <div id="functionParametersTemplate"> 102 <h5>Parameters</h5> 103 <dl> 104 <div> 105 <div> 106 </div> 107 </div> 108 </dl> 109 </div> 110 </div> <!-- /SUBTEMPLATES --> 111 112 <a id="top"></a> 113 <div id="skipto"> 114 <a href="#gc-pagecontent">Skip to page content</a> 115 <a href="#gc-toc">Skip to main navigation</a> 116 </div> 117 <!-- API HEADER --> 118 <table id="header" width="100%" cellspacing="0" border="0"> 119 <tbody><tr> 120 <td valign="middle"><a href="http://code.google.com/"><img src="images/code_labs_logo.gif" height="43" width="161" alt="Google Code Labs" style="border:0; 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250 </script> 251 252 <div class="g-unit" id="gc-pagecontent"> 253 <div id="pageTitle"> 254 <h1 class="page_title">Autoupdating</h1> 255 </div> 256 <!-- TABLE OF CONTENTS --> 257 <div id="toc"> 258 <h2>Contents</h2> 259 <ol> 260 <li> 261 <a href="#H2-0">Overview</a> 262 <ol> 263 <li style="display: none; "> 264 <a>h3Name</a> 265 </li> 266 </ol> 267 </li><li> 268 <a href="#H2-1">Update URL</a> 269 <ol> 270 <li style="display: none; "> 271 <a>h3Name</a> 272 </li> 273 </ol> 274 </li><li> 275 <a href="#H2-2">Update manifest</a> 276 <ol> 277 <li style="display: none; "> 278 <a>h3Name</a> 279 </li> 280 </ol> 281 </li><li> 282 <a href="#H2-3">Testing</a> 283 <ol> 284 <li style="display: none; "> 285 <a>h3Name</a> 286 </li> 287 </ol> 288 </li><li> 289 <a href="#H2-4">Advanced usage: request parameters</a> 290 <ol> 291 <li> 292 <a href="#H3-5">Future work</a> 293 </li> 294 </ol> 295 </li><li> 296 <a href="#H2-6">Advanced usage: minimum browser version</a> 297 <ol> 298 <li style="display: none; "> 299 <a>h3Name</a> 300 </li> 301 </ol> 302 </li> 303 <li style="display: none; "> 304 <a href="#apiReference">API reference</a> 305 <ol> 306 <li> 307 <a href="#properties">Properties</a> 308 <ol> 309 <li> 310 <a href="#property-anchor">propertyName</a> 311 </li> 312 </ol> 313 </li> 314 <li> 315 <a>Methods</a> 316 <ol> 317 <li> 318 <a href="#method-anchor">methodName</a> 319 </li> 320 </ol> 321 </li> 322 <li> 323 <a>Events</a> 324 <ol> 325 <li> 326 <a href="#event-anchor">eventName</a> 327 </li> 328 </ol> 329 </li> 330 <li> 331 <a href="#types">Types</a> 332 <ol> 333 <li> 334 <a href="#id-anchor">id</a> 335 </li> 336 </ol> 337 </li> 338 </ol> 339 </li> 340 </ol> 341 </div> 342 <!-- /TABLE OF CONTENTS --> 343 344 <!-- Standard content lead-in for experimental API pages --> 345 <p id="classSummary" style="display: none; "> 346 For information on how to use experimental APIs, see the <a href="experimental.html">chrome.experimental.* APIs</a> page. 347 </p> 348 349 <!-- STATIC CONTENT PLACEHOLDER --> 350 <div id="static"><div id="pageData-name" class="pageData">Autoupdating</div> 351<div id="pageData-showTOC" class="pageData">true</div> 352 353<p>We want extensions to be autoupdated for some of the same reasons as Google Chrome itself: to incorporate bug and security fixes, add new features or performance enhancements, and improve user interfaces.</p> 354 355<p>If you publish your extension using the <a href="https://chrome.google.com/webstore/developer/dashboard">Chrome Developer Dashboard</a>, you can <em>ignore this page</em>. You can use the dashboard to release updated versions of your extension to users, as well as to the Extensions Gallery or Chrome Web Store.</p> 356 357<p>If you want to host your extension somewhere other than the gallery or store, keep reading. 358You should also read <a href="hosting.html">Hosting</a> and 359<a href="packaging.html">Packaging</a>.</p> 360 361 362<a name="H2-0"></a><h2>Overview</h2> 363<ul><li>An extension manifest may contain an "update_url" for doing update checks.</li> 364<li>The content returned by an update check is an "update manifest" XML document listing the latest version of an extension (or set of extensions, more on that later).</li></ul> 365 366<p>Every few hours, the browser will check if any installed extensions have an autoupdate URL. For each one, it will make a request to that URL looking for an update manifest XML file. If the update manifest mentions a version of an extension that is more recent than what's installed, it will download and install the new version. Similar to manual updates, the new crx must be signed with the same private key as the currently installed version.</p> 367 368 369<a name="H2-1"></a><h2>Update URL</h2> 370<p>For those who are hosting their own extensions, you need to add the "update_url" key to your <a href="manifest.html">manifest.json</a> file like this:</p> 371 372<pre>{ 373 "name": "My extension", 374 ... 375 <b>"update_url": "http://myhost.com/mytestextension/updates.xml"</b>, 376 ... 377} 378</pre> 379 380<a name="H2-2"></a><h2>Update manifest</h2> 381<p>The "update manifest" returned by the server should be an XML document that looks like this (parts you'll want to modify highlighted):</p> 382 383<pre><?xml version='1.0' encoding='UTF-8'?> 384<gupdate xmlns='http://www.google.com/update2/response' protocol='2.0'> 385 <app appid='<b>aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</b>'> 386 <updatecheck codebase='<b>http://myhost.com/mytestextension/mte_v2.crx</b>' version='<b>2.0</b>' /> 387 </app> 388</gupdate> 389</pre> 390 391<p>(This XML format is borrowed from that used by Omaha, Google's update infrastructure. See <a href="http://code.google.com/p/omaha/">http://code.google.com/p/omaha/</a> for more details.)</p> 392 393<p><b>appid</b><br> 394The 'appid' property is the extension id, generated based on a hash of the extension's public key as described in <a href="packaging.html">Packaging</a>. You can find out the id of your extension by going to <b>chrome://extensions</b>.</p> 395 396<p><b>codebase</b><br> 397The 'codebase' property is a URL to the crx file.</p> 398 399<p><b>version</b><br> 400This is used by the client to determine whether it should download the crx file at 'codebase'. It should match the version parameter in the crx file's manifest.json file.</p> 401<p>The update manifest XML file may contain information about multiple extensions by including multiple <code><app></code> tags.</p> 402 403 404<a name="H2-3"></a><h2>Testing</h2> 405<p>The default update check frequency is several hours, 406but you can force an update using the Extensions page's 407<b>Update extensions now</b> button. 408</p> 409 410<p> 411Another option is to use the --extensions-update-frequency command-line flag to set a more frequent interval in seconds. For instance, to make checks run every 45 seconds, you would run Google Chrome like this:</p> 412<pre>chrome.exe <b>--extensions-update-frequency=45</b></pre> 413 414<p>Note that this affects checks for all installed extensions, so consider the bandwidth and server load implications of this. You may want to temporarily uninstall all but the one extension you are testing with, and should not run with this option turned on during normal browser usage.</p> 415 416 417<a name="H2-4"></a><h2>Advanced usage: request parameters</h2> 418<p>The basic autoupdate mechanism is designed to make the server-side work as easy as just dropping a static XML file onto any plain webserver such as apache, and updating that XML file as you release new versions of your extension(s).</p> 419<p>More advanced developers may wish to take advantage of the fact that we add on parameters to the request for the update manifest to indicate the extension id and version. Then they can use the same update_url for all of their extensions pointing to a URL running dynamic server side code instead of a static XML file.</p> 420<p>The format of the request parameters is:</p> 421<p><code> ?x=<extension_data></code></p> 422<p>where <code><extension_data></code> is an URL-encoded string of the format:</p> 423<p><code> id=<id>&v=<version></code></p> 424 425<p>So for example, say we have two extensions installed</p> 426<p> Extension 1 with id "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" and version "1.1"<br> 427 Extension 2 with id "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" and version "0.4"</p> 428 429<p>and that both point at the same update_url: <code>http://test.com/extension_updates.php</code></p> 430 431<p>The two requests made would be:</p> 432<code>http://test.com/extension_updates.php?x=id%3Daaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa%26v%3D1.1</code> 433<br> 434<code>http://test.com/extension_updates.php?x=id%3Dbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb%26v%3D0.4</code> 435 436<p><b>Note</b>: in releases before 3.0.196.x there was a bug in how request parameters were put together (<a href="http://crbug.com/17469" rel="nofollow">http://crbug.com/17469</a>).</p> 437 438<a name="H3-5"></a><h3>Future work</h3> 439<p>While not implemented yet, we will eventually list multiple extensions in a single request for each unique update_url. For the above example, the request would end up being:</p> 440<p><code>http://test.com/extension_updates.php?x=id%3Daaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa%26v%3D1.1&x=id%3Dbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb%26v%3D0.4</code></p> 441 442<p>If the number of installed extensions using the same update_url is large enough that a GET request URL would be too long (probably greater than 1024 characters or so), the update check will instead issue a POST with the request parameters in the POST body.</p> 443 444 445<a name="H2-6"></a><h2>Advanced usage: minimum browser version</h2> 446<p>As we add more APIs to the extensions system, it's possible you will want to release an updated version of an extension that will only work with newer versions of the browser. While Google Chrome itself is autoupdated, it can take a few days before the majority of the user base has updated to any given new release. To ensure that a given extension update will apply only to Google Chrome versions at or higher than a specific version, you would add the prodversionmin parameter to the <code><app></code> tag in your update manifest. For example:</p> 447 448<pre><?xml version='1.0' encoding='UTF-8'?> 449<gupdate xmlns='http://www.google.com/update2/response' protocol='2.0'> 450 <app appid='aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'> 451 <updatecheck codebase='http://myhost.com/mytestextension/mte_v2.crx' version='2.0' <b>prodversionmin='3.0.193.0'</b>/> 452 </app> 453</gupdate> 454</pre> 455 456<p>This would ensure that users of this extension would autoupdate to version 2 only if they are running Google Chrome 3.0.193.0 or greater.</p> 457 458</div> 459 460 <!-- API PAGE --> 461 <div class="apiPage" style="display: none; "> 462 <a name="apiReference"></a> 463 <h2>API reference: chrome.apiname </h2> 464 465 <!-- PROPERTIES --> 466 <div class="apiGroup"> 467 <a name="properties"></a> 468 <h3 id="properties">Properties</h3> 469 470 <div> 471 <a></a> 472 <h4>getLastError</h4> 473 <div class="summary"> 474 <!-- Note: intentionally longer 80 columns --> 475 <span>chrome.extension</span><span>lastError</span> 476 </div> 477 <div> 478 </div> 479 </div> 480 481 </div> <!-- /apiGroup --> 482 483 <!-- METHODS --> 484 <div id="methodsTemplate" class="apiGroup"> 485 <a></a> 486 <h3>Methods</h3> 487 488 <!-- iterates over all functions --> 489 <div class="apiItem"> 490 <a></a> <!-- method-anchor --> 491 <h4>method name</h4> 492 493 <div class="summary"><span>void</span> 494 <!-- Note: intentionally longer 80 columns --> 495 <span>chrome.module.methodName</span>(<span><span>, </span><span></span> 496 <var><span></span></var></span>)</div> 497 498 <div class="description"> 499 <p class="todo">Undocumented.</p> 500 <p> 501 A description from the json schema def of the function goes here. 502 </p> 503 504 <!-- PARAMETERS --> 505 <h4>Parameters</h4> 506 <dl> 507 <div> 508 <div> 509 </div> 510 </div> 511 </dl> 512 513 <!-- RETURNS --> 514 <h4>Returns</h4> 515 <dl> 516 <div> 517 <div> 518 </div> 519 </div> 520 </dl> 521 522 <!-- CALLBACK --> 523 <div> 524 <div> 525 <h4>Callback function</h4> 526 <p> 527 The callback <em>parameter</em> should specify a function 528 that looks like this: 529 </p> 530 <p> 531 If you specify the <em>callback</em> parameter, it should 532 specify a function that looks like this: 533 </p> 534 535 <!-- Note: intentionally longer 80 columns --> 536 <pre>function(<span>Type param1, Type param2</span>) <span class="subdued">{...}</span>;</pre> 537 <dl> 538 <div> 539 <div> 540 </div> 541 </div> 542 </dl> 543 </div> 544 </div> 545 546 <!-- MIN_VERSION --> 547 <p> 548 This function was added in version <b><span></span></b>. 549 If you require this function, the manifest key 550 <a href="manifest.html#minimum_chrome_version">minimum_chrome_version</a> 551 can ensure that your extension won't be run in an earlier browser version. 552 </p> 553 </div> <!-- /description --> 554 555 </div> <!-- /apiItem --> 556 557 </div> <!-- /apiGroup --> 558 559 <!-- EVENTS --> 560 <div id="eventsTemplate" class="apiGroup"> 561 <a></a> 562 <h3>Events</h3> 563 <!-- iterates over all events --> 564 <div class="apiItem"> 565 <a></a> 566 <h4>event name</h4> 567 568 <div class="summary"> 569 <!-- Note: intentionally longer 80 columns --> 570 <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>); 571 </div> 572 573 <div class="description"> 574 <p class="todo">Undocumented.</p> 575 <p> 576 A description from the json schema def of the event goes here. 577 </p> 578 579 <!-- PARAMETERS --> 580 <div> 581 <h4>Parameters</h4> 582 <dl> 583 <div> 584 <div> 585 </div> 586 </div> 587 </dl> 588 </div> 589 </div> <!-- /decription --> 590 591 </div> <!-- /apiItem --> 592 593 </div> <!-- /apiGroup --> 594 595 <!-- TYPES --> 596 <div class="apiGroup"> 597 <a name="types"></a> 598 <h3 id="types">Types</h3> 599 600 <!-- iterates over all types --> 601 <div class="apiItem"> 602 <a></a> 603 <h4>type name</h4> 604 605 <div> 606 </div> 607 608 </div> <!-- /apiItem --> 609 610 </div> <!-- /apiGroup --> 611 612 </div> <!-- /apiPage --> 613 </div> <!-- /gc-pagecontent --> 614 </div> <!-- /g-section --> 615 </div> <!-- /codesiteContent --> 616 <div id="gc-footer" --=""> 617 <div class="text"> 618 <p> 619 Except as otherwise <a href="http://code.google.com/policies.html#restrictions">noted</a>, 620 the content of this page is licensed under the <a rel="license" href="http://creativecommons.org/licenses/by/3.0/">Creative Commons 621 Attribution 3.0 License</a>, and code samples are licensed under the 622 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD License</a>. 623 </p> 624 <p> 625 ©2011 Google 626 </p> 627 628<!-- begin analytics --> 629<script src="http://www.google-analytics.com/urchin.js" type="text/javascript"></script> 630<script src="http://www.google-analytics.com/ga.js" type="text/javascript"></script> 631 632<script type="text/javascript"> 633 // chrome doc tracking 634 try { 635 var engdocs = _gat._getTracker("YT-10763712-2"); 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