discovery-api/Overview.src.html
author Rich Tibbett <richt@opera.com>
Mon, 12 Aug 2013 16:20:17 +1000
changeset 440 fcbaadc4fd54
parent 438 d66ca00fe7d9
child 441 b4b2569b4e9b
permissions -rw-r--r--
Fix [DAP-ISSUE-135]: Add security and privacy considerations section [Network Service Discovery]
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<!DOCTYPE html>
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<!--
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  THIS IS THE WORKING VERSION OF THE CURRENT SPECIFICATION!
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  This specification is built using ReSpec.js <http://dev.w3.org/2009/dap/ReSpec.js/documentation.html>
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  From time to time it's necessary to HTML5 Tidy this document using the tool @ <http://w3c.github.com/tidy-html5/>.
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  The command used to format this document (Overview.src.html) is as follows (replacing all = signs with - signs!):
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  @> tidy ==new-blocklevel-tags section ==char-encoding utf8 ==tidy-mark no ==indent yes ==indent-spaces 2 ==indent-attributes yes ==wrap 120 ==fix-bad-comments yes -m Overview.src.html
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  To publish a new compiled version (Overview.html), we need to open this file (Overview.src.html) in any web browser.
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  Once it has loaded we press 'Ctrl + Shift + S' (or 'Cmd' + 'Shift' + 'S' on Mac) and then select
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  'Save as HTML (Source)' from the resulting menu.
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  We then replace Overview.html with the produced HTML source of this process.
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  Next we run HTML5 Tidy over our new Overview.html file with the following command (replacing all = signs with - signs!):
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  @> tidy ==new-blocklevel-tags section ==char-encoding utf8 ==tidy-mark no ==indent yes ==indent-spaces 2 ==indent-attributes yes ==wrap 120 ==hide-comments yes -m Overview.html
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  Now the specification is ready to be published :)
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-->
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<html>
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  <head>
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    <title>
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      Network Service Discovery
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    </title>
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    <meta http-equiv='Content-Type'
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          content='text/html; charset=utf-8'>
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    <script type="text/javascript"
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          class='remove'>
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var respecConfig = {
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          specStatus:   "ED",
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          //publishDate:  "2013-03-29",
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          shortName:    "discovery-api",
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          edDraftURI:   "http://dvcs.w3.org/hg/dap/raw-file/tip/discovery-api/Overview.html",
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          previousMaturity: "FPWD",
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          previousPublishDate: "2012-10-04",
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          editors: [
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            {
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              name:       "Rich Tibbett",
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              //url:        "http://richt.me/",
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              company:    "Opera Software ASA",
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              companyURL: "http://opera.com/"
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            }
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          ],
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          wg:           "Device APIs Working Group",
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          wgURI:        "http://www.w3.org/2009/dap/",
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          wgPublicList: "public-device-apis",
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          wgPatentURI:  "http://www.w3.org/2004/01/pp-impl/43696/status",
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    //          extraCSS:     ["http://dvcs.w3.org/hg/dap/raw-file/tip/discovery-api/css/respec.nsd.css"],
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    //          inlineCSS:    true,
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          noIDLIn:      true
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      };
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    </script>
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    <script src='http://www.w3.org/Tools/respec/respec-w3c-common'
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          type="text/javascript"
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          class='remove'
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          async="">
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</script>
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    <style>
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/* Custom ReSpec CSS (by Rich Tibbett) */
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     /* Add better spacing to sections */
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     section, .section { margin-bottom: 2em; }
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     /* Reduce note & issue render size */
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     .note, .issue { font-size:0.8em; }
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     /* Add addition spacing to <ol> and <ul> for rule definition */
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     ol.rule li, ul.rule li { padding:0.6em; }
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     pre.widl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; position: relative; }
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     pre.widl :link, pre.widl :visited { color: #000; background: transparent; }
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     pre.widl:before { content: "IDL"; font: bold small sans-serif; padding: 0.5em; background: white; position: absolute; top: 0; margin: -1px 0 0 -4em; width: 1.5em; border: thin solid; border-radius: 0 0 0 0.5em }
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     div.example { border: solid thin black; background: #FFFFF0; color: black; padding: 0.5em 1em; position: relative; margin: 1em 0 1em 4.6em; width: auto; }
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     div.example:before { content: "EXAMPLE"; font: bold small sans-serif; padding: 0.5em; background: white; color: black; position: absolute; top: 0; margin: -1px 0 0 -7.6em; width: 5em; border: thin solid black; border-radius: 0 0 0 0.5em }
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     dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
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     hr + dl.domintro, div.impl + dl.domintro { margin-top: 2.5em; margin-bottom: 1.5em; }
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     dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
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     dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
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     dl.domintro dd p { margin: 0.5em 0; }
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     dl.domintro code {font-size: inherit; font-style: italic; }
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     dl.domintro:before { display: table; margin: -1em -0.5em 0.5em auto; width: auto; content: 'This box is non-normative. Implementation requirements are given below this box.'; color: red; border: solid 2px; background: white; padding: 0 0.25em; font-size:0.8em; }
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     table { border-collapse:collapse; border-style:hidden hidden none hidden }
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     table thead { border-bottom:solid }
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     table tbody th:first-child { border-left:solid }
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     table td, table th { border-left:solid; border-right:solid; border-bottom:solid thin; vertical-align:top; padding:0.2em }
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    </style>
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    <script type="text/javascript"
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          class="remove">
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// RESPEC DEFINITIONS STYLE OVERLOAD
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        window.addEventListener('load', function() {
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          var overrideStyleEl = document.createElement('style');
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          overrideStyleEl.textContent += "\n  a.externalDFN { color: #00C; border-bottom: 1px dashed #00C; }";
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          overrideStyleEl.textContent += "\n  a.internalDFN { color: #00C; text-decoration: solid; }";
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          document.querySelector('body').appendChild(overrideStyleEl);
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        }, false);
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    </script>
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  </head>
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  <body>
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    <section id='abstract'>
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      <p>
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        This specification defines a mechanism for an HTML document to discover and subsequently communicate with
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        <abbr title="Hypertext Transfer Protocol">HTTP</abbr>-based services advertised via common discovery protocols
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        within the current network.
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      </p>
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    </section>
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    <section id='sotd'>
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      <p>
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        This document represents the early consensus of the group on the scope and features of the proposed API.
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      </p>
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    </section>
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    <section class="informative">
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      <h3>
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        Introduction
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      </h3>
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      <p>
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        To enable Web pages to connect and communicate with Local-networked Services provided over HTTP, this
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        specification introduces the <a href="#navigatornetworkservice"><code>NavigatorNetworkService</code></a>
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        interface.
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      </p>
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      <p>
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        Using this <abbr title="Application Programming Interface">API</abbr> consists of requesting a well-known
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        service type, known by developers and advertised by Local-networked Devices. User authorization, where the user
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        connects the web page to discovered services, is expected before the web page is able to interact with any
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        Local-networked Services.
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      </p>
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      <p>
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        A web page creates a request to obtain connectivity to services running in the network by specifying a
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        well-known discovery service type that it wishes to interact with.
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      </p>
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      <p>
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        The user agent, having captured all advertised services on the network from the <a>service discovery
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        mechanisms</a> included in this recommendation, attempts to match the requested service type to a discovered
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        service according to the processing described herein.
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      </p>
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      <p>
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        If a service connectivity request is successful then the Web page is provided with a promise-based success
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        callback with the all necessary information to communicate with the authorized Local-networked Service. If the
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        request fails then the Web page will receive a promise-based error callback containing an error code describing
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        the cause of Local-networked Service connectivity failure.
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      </p>
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      <p>
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        Once connected to a Local-networked Service the Web page can send requests and receive responses to the
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        Local-networked Service via the messaging format and appropriate channel inferred from the service type
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        authorized via the provided API. The Web page, once connected, can also receive service-pushed events, in the
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        messaging format supported by the Local-networked Device, if such event subscription functionality is provided
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        by the connected Local-networked Service.
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      </p>
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      <p>
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        Services available within the local network can connect and disconnect at different times during the execution
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        of a web page. The user agent can inform a web page when the state of networked services matching any of the
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        requested valid service types change. Web pages can use this information to enable in-page experiences for
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        communicating the state of networked services with the ability to change the particular service or set of
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        services the page is connected to (by re-invoking the <a href=
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        "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> method defined herein).
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      </p>
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      <div class="example">
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        <p>
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          Example of requesting a DNS-SD advertised service:
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        </p>
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        <hr>
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        <pre class="highlight">
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function showServices( services ) {
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  // Show a list of all the services provided to the web page
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  for(var i = 0, l = services.length; i &lt; l; i++) console.log( services[i].name );
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}
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navigator.getNetworkServices('zeroconf:_boxee-jsonrpc._tcp').then(showServices);
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</pre>
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      </div>
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      <div class="example">
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        <p>
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          Example of requesting a UPnP advertised service, also handling error conditions:
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        </p>
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        <hr>
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        <pre class="highlight">
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function showServices( services ) {
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  // Show a list of all the services provided to the web page
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  for(var i = 0, l = services.length; i &lt; l; i++) console.log( services[i].name );
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}
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function error( e ) {
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  console.log( "Error occurred: " + e.code );
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}
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navigator.getNetworkServices('upnp:urn:schemas-upnp-org:service:ContentDirectory:1').then(showServices, error);
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</pre>
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      </div>
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      <div class="example">
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        <p>
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          Example of requesting either a DNS-SD or UPnP advertised service:
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        </p>
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        <hr>
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        <pre class="highlight">
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function showServices( services ) {
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  // Show a list of all the services provided to the web page (+ service type)
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  for(var i = 0, l = services.length; i &lt; l; i++)
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     console.log( services[i].name + '(' + services[i].type + ')' );
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}
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navigator.getNetworkServices([
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  'zeroconf:_boxee-jsonrpc._tcp',
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  'upnp:urn:schemas-upnp-org:service:ContentDirectory:1'
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]).then(showServices);
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</pre>
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      </div>
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      <p>
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        For more detailed examples, including examples of communicating with obtained networked services, see the
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        <a href="#examples">Examples</a> section.
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      </p>
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    </section>
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    <section id='conformance'>
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      <p>
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        Requirements phrased in the imperative as part of algorithms (such as "strip any leading space characters" or
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        "return false and abort these steps") are to be interpreted with the meaning of the key word ("must", "should",
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        "may", etc) used in introducing the algorithm.
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      </p>
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      <p>
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        Some conformance requirements are phrased as requirements on attributes, methods or objects. Such requirements
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        are to be interpreted as requirements on user agents.
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      </p>
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      <p>
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        Conformance requirements phrased as algorithms or specific steps MAY be implemented in any manner, so long as
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        the end result is equivalent. (In particular, the algorithms defined in this specification are intended to be
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        easy to follow, and not intended to be performant.)
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      </p>
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      <p>
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        The only conformance class defined by this specification is a <dfn>user agent</dfn>.
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      </p>
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      <p>
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        User agents MAY impose implementation-specific limits on otherwise unconstrained inputs, e.g. to prevent denial
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        of service attacks, to guard against running out of memory, or to work around platform-specific limitations.
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      </p>
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      <p>
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        When support for a feature is disabled (e.g. as an emergency measure to mitigate a security problem, or to aid
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        in development, or for performance reasons), user agents MUST act as if they had no support for the feature
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        whatsoever, and as if the feature was not mentioned in this specification. For example, if a particular feature
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        is accessed via an attribute in a Web IDL interface, the attribute itself would be omitted from the objects
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        that implement that interface - leaving the attribute on the object but making it return null or throw an
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        exception is insufficient.
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      </p>
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      <section>
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        <h3>
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          Dependencies
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        </h3>This specification relies on several other underlying specifications.
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        <dl>
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          <dt>
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            HTML
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          </dt>
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          <dd>
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            Many fundamental concepts from HTML are used by this specification. [[!HTML5]]
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          </dd>
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          <dt>
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            WebIDL
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          </dt>
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          <dd>
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            The IDL blocks in this specification use the semantics of the WebIDL specification. [[!WEBIDL]]
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          </dd>
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        </dl>
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      </section>
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    </section>
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    <section>
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      <h3>
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        Terminology
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      </h3>
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      <p>
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        The construction "a <code>Foo</code> object", where <code>Foo</code> is actually an interface, is sometimes
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        used instead of the more accurate "an object implementing the interface <code>Foo</code>".
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      </p>
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      <p>
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        The term DOM is used to refer to the API set made available to scripts in Web applications, and does not
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        necessarily imply the existence of an actual <code>Document</code> object or of any other <code>Node</code>
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        objects as defined in the DOM Core specifications. [[!DOM4]]
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      </p>
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      <p>
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        An IDL attribute is said to be <em>getting</em> when its value is being retrieved (e.g. by author script), and
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        is said to be <em>setting</em> when a new value is assigned to it.
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      </p>
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      <p>
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        A <dfn>valid service type</dfn> is any of the following:
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      </p>
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      <ul>
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        <li>a string that begins with <code>upnp:</code> or <code>zeroconf:</code> followed by one or more characters
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        in the ranges U+0021, U+0023 to U+0027, U+002A to U+002B, U+002D to U+002E, U+0030 to U+0039, U+0041 to U+005A,
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        U+005E to U+007E.
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        </li>
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        <li>a string that begins with <code>dial:</code> followed by an integer version.
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        </li>
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      </ul>
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      <p>
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        A <a>valid service type</a> provided in the <code>type</code> attribute of the <a href=
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        "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> method will be matched against the
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        services currently contained in the <a>list of available service records</a> according to the algorithms
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        defined in this specification.
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      </p>
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      <p>
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        A <dfn>user-agent generated callback url</dfn> is a Local-network accessible URL endpoint that a <a>user
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        agent</a> generates and maintains for receiving HTTP NOTIFY requests from UPnP Event sources. It is only
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        required when the user agent implements UPnP Service Discovery as defined in this specification.
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      </p>
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      <p>
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        In this specification we use the following terms to describe the processes required for Local-networked
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        Services management:
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      </p>
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      <ul>
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        <li>A <dfn>new service</dfn> is a Local-networked Service that has not previously been discovered or registered
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        in the <a>list of available service records</a>.
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        </li>
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        <li>An <dfn>existing service</dfn> is a Local-networked Service that has previously been discovered and is
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        registered in the <a>list of available service records</a>.
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        </li>
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        <li>A <dfn>current service</dfn> is a Local-networked Service, represented by a <a href=
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        "#networkservice"><code>NetworkService</code></a> object, that is currently being shared with a web page via a
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        <a href="#networkservices"><code>NetworkServices</code></a> object registered in the <a>list of active service
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        managers</a>.
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        </li>
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      </ul>
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    </section>
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    <section>
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      <h2>
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        Security and privacy considerations
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      </h2>
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      <p>
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        The API defined in this specification can be used to find and connect to devices and services within a user's
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        current network. This discloses information related to a user's network: devices available on their network and
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        the publicly-accessible services ("networked services") currently running and available on those devices. The
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        distribution of this information could potentially compromise the user's privacy. A conforming implementation
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        of this specification MUST provide a mechanism that protects the user's privacy. This mechanism MUST ensure
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        that no networked service information is retrievable without the user's express permission.
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      </p>
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      <section>
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        <h3>
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          Privacy considerations for API implementations
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        </h3>
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        <p>
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          A <a>user agent</a> MUST NOT provide networked service information to web sites without the express
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          permission of the user. A user agent MUST acquire permission through a user interface, unless they have
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          prearranged trust relationships with users, as described below. The user interface MUST include the document
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          base URL. Those permissions that are acquired through the user interface and that are preserved beyond the
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          current browsing session (i.e. beyond the time when the browsing context is navigated to another URL) MUST be
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          revocable and a user agent MUST respect revoked permissions.
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        </p>
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        <p>
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          Obtaining the user's express permission to access one API method does not imply the user has granted
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          permission for the same web site to access any other methods that may be provided by this API, or to access
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          the same method with a different set of arguments, as part of the same permission context. If a user has
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          expressed permission for an implementation to, e.g. find a set of existing networked services, the
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          implementation MUST seek the user's express permission if and when any subsequent functions are called on
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          this API.
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        </p>
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        <p>
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          A user agent MAY have prearranged trust relationships that do not require such user interfaces. For example,
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          while a web browser will present a user interface when a web site performs a networked service lookup, a
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          different runtime may have a prearranged, delegated security relationship with the user and, as such, a
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          suitable alternative security and privacy mechanism with which to authorise the retrieval of networked
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          service information.
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        </p>
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      </section>
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      <section class="informative">
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        <h3>
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          Additional API implementation considerations
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        </h3>
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        <p>
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          Further to the requirements listed in the previous section, implementors of the Network Service Discovery API
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          are also advised to consider the following aspects that can negatively affect the privacy of their users: in
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          certain cases, users can inadvertently grant permission to the user agent to disclose networked services to
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          Web sites. In other cases, the content hosted at a certain URL changes in such a way that previously granted
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          networked service permissions no longer apply as far as the user is concerned. Or the users might simply
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          change their minds.
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        </p>
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        <p>
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          Predicting or preventing these situations is inherently difficult. Mitigation and in-depth defensive measures
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          are an implementation responsibility and not prescribed by this specification. However, in designing these
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          measures, implementers are advised to enable user awareness of networked service sharing, and to provide easy
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          access to interfaces that enable revocation of permissions that web applications have for accessing networked
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          services via this API.
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        </p>
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      </section>
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    </section>
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    <section>
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      <h2>
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        Requesting networked services
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      </h2>
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      <pre class="widl">
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[Supplemental, NoInterfaceObject]
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interface <dfn id="navigatornetworkservice">NavigatorNetworkService</dfn> {
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  <a class="externalDFN"
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     href="http://dom.spec.whatwg.org/#promise">Promise</a> <a href=
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     "#dom-navigator-getnetworkservices">getNetworkServices</a>( in any type );
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};
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<a class="externalDFN"
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     href=
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     "http://www.whatwg.org/specs/web-apps/current-work/complete/timers.html#navigator">Navigator</a> implements <a href=
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     "#navigatornetworkservice">NavigatorNetworkService</a>;
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[NoInterfaceObject]
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interface <dfn id="navigatornetworkserviceerror">NavigatorNetworkServiceError</dfn> {
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  const unsigned short <a href="#dom-navigatornetworkserviceerror-permission_denied">PERMISSION_DENIED_ERR</a> = 1;
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  const unsigned short <a href="#dom-navigatornetworkserviceerror-unknown_type_prefix">UNKNOWN_TYPE_PREFIX_ERR</a> = 2;
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  readonly attribute unsigned short <a href="#dom-navigatornetworkserviceerror-code">code</a>;
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};
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</pre>
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      <section>
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        <h2>
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          Methods
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        </h2>
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        <dl class="domintro">
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          <dt>
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            <var title="">promise</var> = <var title="">window</var> . <code title="dom-navigator"><a href=
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            "http://www.whatwg.org/specs/web-apps/current-work/complete/timers.html#navigator">navigator</a></code> .
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            <code title="dom-navigator-getNetworkServices"><a href=
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            "#dom-navigator-getnetworkservices">getNetworkServices</a></code> ( <var title="">type</var> )
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          </dt>
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          <dd>
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            <p>
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              Immediately returns a new <a href="http://dom.spec.whatwg.org/#promise"
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                 class="externalDFN">Promise</a> object and then the user is prompted to select discovered network
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                 services that have advertised support for the requested service type(s).
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            </p>
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            <p>
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              The <var title="">type</var> argument contains one or more <a>valid service type</a> tokens that the web
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              page would like to interact with.
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            </p>
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            <p>
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              If the user accepts, the <var title="">promise</var> object is <a class="externalDFN"
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                 href="http://dom.spec.whatwg.org/#concept-resolver-resolve">resolved</a>, with a <a href=
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                 "#networkservices"><code>NetworkServices</code></a> object as its argument.
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            </p>
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            <p>
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              If the user declines, or an error occurs, the <var title="">promise</var> object is <a class=
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              "externalDFN"
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                 href="http://dom.spec.whatwg.org/#concept-resolver-reject">rejected</a>.
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            </p>
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          </dd>
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        </dl>
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        <div>
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          <p>
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            When the <dfn id="dom-navigator-getnetworkservices"
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               title="dom-navigator-getnetworkservices"><code>getNetworkServices(type)</code></dfn> method is called,
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               the <a>user agent</a> MUST run the following steps:
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          </p>
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          <ol class="rule">
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            <li>Let <var>Network Service Promise</var> be a new <a href="http://dom.spec.whatwg.org/#promise"
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                  class="externalDFN"><code>Promise</code></a> object.
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            </li>
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            <li>Let <var>Network Service Promise's Resolver</var> be the default <a href=
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            "http://dom.spec.whatwg.org/#concept-resolver"
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                  class="externalDFN">resolver</a> of <var>Network Service Promise</var>.
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   461
            </li>
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            <li>Return <var>Network Service Promise</var>, and run the remaining steps asynchronously.
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            </li>
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            <li>Let <var>requested control types</var> be initially set to an empty array.
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            </li>
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            <li>If <var>type</var> is an array consisting of one or more <a>valid service type</a> tokens, then let
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            <var>requested control types</var> by the value of <var>type</var>, removing any non-<a>valid service
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            type</a> tokens from the resulting array.
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            </li>
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            <li>If <var>type</var> is a string consisting of one <a>valid service type</a> token, then let
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            <var>requested control types</var> be an array containing one item with a value of <var>type</var>.
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            </li>
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            <li>If <var>requested control types</var> is an array that contains at least one or more <a title=
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            "valid service type">valid service type</a> tokens then continue to the step labeled <em>process</em>
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   475
            below. Otherwise, reject <var>Network Service Promise</var> by running the <a href=
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   476
            "http://dom.spec.whatwg.org/#concept-resolver-reject"
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   477
                  class="externalDFN">resolver reject algorithm</a> against the <var>Network Service Promise's
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                  Resolver</var>, passing in a new <a href=
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                  "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object whose <a href=
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                  "#dom-navigatornetworkserviceerror-code"><code>code</code></a> attribute has the numeric value 2
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                  (<a href=
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                  "#dom-navigatornetworkserviceerror-unknown_type_prefix"><code>UNKNOWN_TYPE_PREFIX_ERR</code></a>) as
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                  its argument, abort any remaining steps and return.
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            </li>
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            <li>
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              <em>Process</em>: Let <var>services found</var> be an empty array.
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            </li>
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            <li>For each <var>available service</var> in the <a>list of available service records</a> run the following
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            steps:
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              <ol class="rule">
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                <li>For each <var>requested control type</var> in <var>requested control types</var>: If <var>available
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   492
                service</var>'s <code>type</code> attribute equals the <var>requested control type</var> then let <var>
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   493
                  matched service</var> equal the value of <var>available service</var> and continue at the step
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   494
                  labeled <var>attach</var> below.
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diff changeset
   495
                </li>
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   496
                <li>Continue at the next <var>available service</var>.
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diff changeset
   497
                </li>
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diff changeset
   498
                <li>
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   499
                  <em>Attach</em>: If <var>matched service</var> is not empty then run the following steps:
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   500
                  <ol class="rule">
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   501
                    <li>Let <var>new service object</var> be a new <a href=
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   502
                    "#networkservice"><code>NetworkService</code></a> object, mapping the parameters of <var>matched
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   503
                    service</var> to this new object where possible.
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diff changeset
   504
                    </li>
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   505
                    <li>Append <var>new service object</var> to the <var>services found</var> array.
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   506
                    </li>
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diff changeset
   507
                  </ol>
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diff changeset
   508
                </li>
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diff changeset
   509
              </ol>
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   510
            </li>
239
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   511
            <li>Optionally, e.g. based on a previously-established user preference, for security reasons, or due to
437
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diff changeset
   512
            platform limitations, the <a>user agent</a> MAY reject <var>Network Service Promise</var> by running the
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diff changeset
   513
            <a href="http://dom.spec.whatwg.org/#concept-resolver-reject"
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diff changeset
   514
                  class="externalDFN">resolver reject algorithm</a> against the <var>Network Service Promise's
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diff changeset
   515
                  Resolver</var>, passing in a new <a href=
239
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diff changeset
   516
                  "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object whose <a href=
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diff changeset
   517
                  "#dom-navigatornetworkserviceerror-code"><code>code</code></a> attribute has the numeric value 1
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diff changeset
   518
                  (<a href=
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diff changeset
   519
                  "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a>) as its
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diff changeset
   520
                  argument, abort any remaining steps and return.
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diff changeset
   521
            </li>
371
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   522
            <li>The user agent MUST NOT provide the entry script's origin with a <a href=
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   523
            "#networkservices"><code>NetworkServices</code></a> object without prior permission given by the user.
239
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   524
              <p>
371
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   525
                If <var>services found</var> is not an empty array then the <a>user agent</a> MAY choose to prompt the
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   526
                user in a user-agent-specific manner for permission to provide the <a href=
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diff changeset
   527
                "http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
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diff changeset
   528
                   class="externalDFN">entry script</a>'s <a href=
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   529
                   "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   530
                   class="externalDFN">origin</a> with a <a href="#networkservices"><code>NetworkServices</code></a>
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   531
                   object representing the <a>user-authorized</a> subset of <var>services found</var>.
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   532
              </p>
239
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diff changeset
   533
              <p>
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diff changeset
   534
                Alternatively, the user agent MAY wish to skip this user opt-in step and choose to fulfill <var>Network
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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diff changeset
   535
                Service Promise</var> immediately based on a previously-established user preference, for security
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   536
                reasons, or due to platform limitations. In such an implementation, if <var>Network Service
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   537
                Promise</var> is to be fulfilled as a result of a previously-established user preference then the
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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diff changeset
   538
                <a>user agent</a> MUST continue at the next step of this algorithm.
371
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diff changeset
   539
              </p>
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   540
              <p>
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   541
                If permission has been granted by the user to access one or more networked services then the <a>user
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   542
                agent</a> SHOULD include an "ongoing local-network communication" indicator.
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   543
              </p>
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   544
              <p>
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   545
                If permission has been denied by the user, <a>user agent</a> or platform, then the <a>user agent</a>
437
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   546
                MUST reject <var>Network Service Promise</var> by running the <a href=
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   547
                "http://dom.spec.whatwg.org/#concept-resolver-reject"
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   548
                   class="externalDFN">resolver reject algorithm</a> against the <var>Network Service Promise's
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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diff changeset
   549
                   Resolver</var>, passing in a new <a href=
239
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diff changeset
   550
                   "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object whose <a href=
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diff changeset
   551
                   "#dom-navigatornetworkserviceerror-code"><code>code</code></a> attribute has the numeric value 1
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diff changeset
   552
                   (<a href=
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diff changeset
   553
                   "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a>) as its
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diff changeset
   554
                   argument, abort any remaining steps and return.
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diff changeset
   555
              </p>
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   556
              <p>
371
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diff changeset
   557
                If the user never responds or no previously-established user preference has been met, this algorithm
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   558
                stalls on this step.
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   559
              </p>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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diff changeset
   560
            </li>
254
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diff changeset
   561
            <li>Let <var>services</var> be an empty array.
180
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   562
            </li>
371
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diff changeset
   563
            <li>If <var>services found</var> is not an empty array then set <var>services</var> to be an array of one
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   564
            or more <a href="#networkservice"><code>NetworkService</code></a> objects for which the user granted
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diff changeset
   565
            permission above - known as the current objects <dfn>user-authorized</dfn> services.
254
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diff changeset
   566
            </li>
377
a311e7fe116c Add removal of entry script origin's URL whitelist urls during the getNetworkServices() algorithm.
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parents: 376
diff changeset
   567
            <li>Remove all previously whitelisted urls from the <a>entry script origin's URL whitelist</a> granted in
a311e7fe116c Add removal of entry script origin's URL whitelist urls during the getNetworkServices() algorithm.
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diff changeset
   568
            the current <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
a311e7fe116c Add removal of entry script origin's URL whitelist urls during the getNetworkServices() algorithm.
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parents: 376
diff changeset
   569
                  class="externalDFN">entry script</a>'s <a href=
a311e7fe116c Add removal of entry script origin's URL whitelist urls during the getNetworkServices() algorithm.
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diff changeset
   570
                  "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
a311e7fe116c Add removal of entry script origin's URL whitelist urls during the getNetworkServices() algorithm.
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parents: 376
diff changeset
   571
                  class="externalDFN">origin</a>.
a311e7fe116c Add removal of entry script origin's URL whitelist urls during the getNetworkServices() algorithm.
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diff changeset
   572
            </li>
254
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diff changeset
   573
            <li>For each Object <var>service</var> in <var>services</var>, if any, run the following sub-steps:
239
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diff changeset
   574
              <ol class="rule">
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   575
                <li>Add the <var>service</var>'s <code>url</code> parameter to the <a>entry script origin's
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diff changeset
   576
                  <abbr title="Uniform Resource Locator">URL</abbr> whitelist</a>.
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diff changeset
   577
                </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   578
                <li>If <var>service</var>'s <code>type</code> parameter begins with the DOMString "<code>upnp:</code>"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   579
                and the <var>service</var>'s <code>eventsUrl</code> parameter is not empty then <a>setup a UPnP Events
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   580
                Subscription</a> for <var>service</var>.
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diff changeset
   581
                </li>
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diff changeset
   582
              </ol>
180
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   583
            </li>
239
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diff changeset
   584
            <li>Let <var>services manager</var> be a new <a href="#networkservices"><code>NetworkServices</code></a>
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diff changeset
   585
            object.
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diff changeset
   586
            </li>
375
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
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parents: 374
diff changeset
   587
            <li>Store <var>requested control types</var> against <var>services manager</var> as an internal variable.
f290bbd84426 Increment/decrement servicesAvailable in rules for 'adding an available service' and 'removing an available service' based on the original requested control types provided in the original getNetworkServices() call (from: http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html)
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diff changeset
   588
            </li>
239
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   589
            <li>Set <var>services manager</var>'s <a href=
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diff changeset
   590
            "#dom-networkservices-servicesavailable"><code>servicesAvailable</code></a> attribute to the number of
250
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diff changeset
   591
            items currently found in the <a>list of available service records</a> whose <code>type</code> property
239
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diff changeset
   592
            matches any of the tokens requested in <var>requested control types</var>.
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diff changeset
   593
            </li>
371
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diff changeset
   594
            <li>Add <var>services</var>, if any, to the <var>services manager</var> object as its collection of
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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parents: 332
diff changeset
   595
            <a>indexed properties</a>. If <var>services</var> is an empty array then the <var>services manager</var>
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   596
            does not have any <var>indexed properties</var>.
250
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diff changeset
   597
            </li>
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   598
            <li>Set <var>services manager</var>'s <a href="#dom-networkservices-length"><code>length</code></a>
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   599
            attribute to the number of items in <var>services</var>.
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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   600
            </li>
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diff changeset
   601
            <li>Add <var>services manager</var> to the <a>list of active service managers</a>.
239
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diff changeset
   602
            </li>
437
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diff changeset
   603
            <li>The <a>user agent</a> MUST fulfill <var>Network Service Promise</var> by running the <a href=
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   604
            "http://dom.spec.whatwg.org/#concept-resolver-fulfill"
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   605
                  class="externalDFN">resolver fulfill algorithm</a> against the <var>Network Service Promise's
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   606
                  Resolver</var>, passing in <var>services manager</var> as its argument.
239
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diff changeset
   607
            </li>
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diff changeset
   608
          </ol>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   609
          <p>
239
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diff changeset
   610
            The <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#task-source"
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diff changeset
   611
               class="externalDFN">task source</a> for these <a href=
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diff changeset
   612
               "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#concept-task"
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diff changeset
   613
               class="externalDFN">tasks</a> is the <a href=
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diff changeset
   614
               "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#user-interaction-task-source"
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diff changeset
   615
               class="externalDFN">user interaction task source</a>.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   616
          </p>
180
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diff changeset
   617
          <p>
239
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diff changeset
   618
            When a <a href="#networkservice"><code>NetworkService</code></a> object is provided to a Web page, the
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   619
            <a>user agent</a> MUST add the <code>url</code> property to the <dfn>entry script origin's URL
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   620
            whitelist</dfn>. This list enables the Web page to override and initiate cross-site resource requests
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   621
            towards these URLs, and any sub-resources of these URLs, within the current <a href=
239
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diff changeset
   622
            "http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
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diff changeset
   623
               class="externalDFN">entry script</a>'s <a href=
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diff changeset
   624
               "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
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diff changeset
   625
               class="externalDFN">origin</a> via various existing mechanisms (e.g. Web Sockets, Server-Sent Events,
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diff changeset
   626
               Web Messaging, XMLHttpRequest).
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   627
          </p>
239
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diff changeset
   628
          <p>
371
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parents: 332
diff changeset
   629
            If the user navigates away from the <a href=
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   630
            "http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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parents: 332
diff changeset
   631
               class="externalDFN">entry script</a>'s <a href=
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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parents: 332
diff changeset
   632
               "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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parents: 332
diff changeset
   633
               class="externalDFN">origin</a> then the <a>user agent</a> <em class="ct">MUST</em> remove all previously
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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parents: 332
diff changeset
   634
               whitelisted urls from the <a>entry script origin's URL whitelist</a>. There is no persistence to network
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   635
               service selections provided to a web page. It is not possible to access a previously white-listed
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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diff changeset
   636
               networked service without the necessary user authorization in all of the following cases:
239
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diff changeset
   637
          </p>
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parents: 238
diff changeset
   638
          <ul>
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diff changeset
   639
            <li>If the current script is reloaded at any point in the same or different window.
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parents: 238
diff changeset
   640
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   641
            <li>if the current script reinvokes the <a href=
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diff changeset
   642
            "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> method at any point in its
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diff changeset
   643
            execution.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   644
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   645
            <li>If the user navigates forward or back in their history to reload the current page.
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parents: 238
diff changeset
   646
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   647
            <li>If a script is running in a different origin.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   648
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   649
          </ul>
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diff changeset
   650
        </div>
180
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diff changeset
   651
      </section>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   652
      <section>
239
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diff changeset
   653
        <h3>
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diff changeset
   654
          Error Handling
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   655
        </h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   656
        <dl class="domintro">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   657
          <dt>
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diff changeset
   658
            <var title="">error</var> . <code title="dom-NavigatorNetworkServiceError-code"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   659
            "#dom-navigatornetworkserviceerror-code">code</a></code>
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parents: 238
diff changeset
   660
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   661
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   662
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   663
              Returns the current error's error code. At the current time, this will be <code>1</code> or
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parents: 238
diff changeset
   664
              <code>2</code>, for which the corresponding error constants <a href=
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parents: 238
diff changeset
   665
              "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a> and <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   666
              "#dom-navigatornetworkserviceerror-unknown_type_prefix"><code>UNKNOWN_TYPE_PREFIX_ERR</code></a> are
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   667
              defined.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   668
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   669
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   670
        </dl>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   671
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   672
          The <dfn id="dom-navigatornetworkserviceerror-code"
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parents: 238
diff changeset
   673
             title="dom-navigatornetworkserviceerror-code"><code>code</code></dfn> attribute of a <a href=
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parents: 238
diff changeset
   674
             "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object <em class=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   675
             "ct">MUST</em> return the code for the error, which will be one of the following:
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parents: 238
diff changeset
   676
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   677
        <dl>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   678
          <dt>
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parents: 238
diff changeset
   679
            <dfn id="dom-navigatornetworkserviceerror-permission_denied"
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parents: 238
diff changeset
   680
                title="dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></dfn>
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parents: 238
diff changeset
   681
                (numeric value 1)
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   682
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   683
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   684
            The user or user agent denied the page permission to access any services.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   685
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   686
          <dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   687
            <dfn id="dom-navigatornetworkserviceerror-unknown_type_prefix"
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parents: 238
diff changeset
   688
                title="dom-navigatornetworkserviceerror-unknown_type_prefix"><code>UNKNOWN_TYPE_PREFIX_ERR</code></dfn>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   689
                (numeric value 2)
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   690
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   691
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   692
            No <a>valid service type</a> tokens were provided in the method invocation.
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parents: 238
diff changeset
   693
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   694
        </dl>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   695
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   696
    </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   697
    <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   698
      <h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   699
        Obtaining networked services
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   700
      </h2>
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   701
      <p>
371
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
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parents: 332
diff changeset
   702
        The <a href="#networkservices"><code>NetworkServices</code></a> interface represents a collection of zero or
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   703
        more <dfn>indexed properties</dfn> that are each a <a>user-authorized</a> <a href=
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   704
        "#networkservice"><code>NetworkService</code></a> object.
254
f29ec967fb3b Editorial updates to NSD spec
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parents: 250
diff changeset
   705
      </p>
f29ec967fb3b Editorial updates to NSD spec
Rich Tibbett <richt@opera.com>
parents: 250
diff changeset
   706
      <p>
437
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
Rich Tibbett <richt@opera.com>
parents: 402
diff changeset
   707
        A <a href="#networkservices"><code>NetworkServices</code></a> object is the <a href=
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
Rich Tibbett <richt@opera.com>
parents: 402
diff changeset
   708
        "http://dom.spec.whatwg.org/#concept-promise-result"
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
Rich Tibbett <richt@opera.com>
parents: 402
diff changeset
   709
           class="externalDFN">promise result</a> from a call to <a href=
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
Rich Tibbett <richt@opera.com>
parents: 402
diff changeset
   710
           "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a>.
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   711
      </p>
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   712
      <pre class="widl">
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   713
[NoInterfaceObject]
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   714
interface <dfn id="networkservices">NetworkServices</dfn> {
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   715
  readonly attribute unsigned long    <a href="#dom-networkservices-length">length</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   716
  getter <a href="#networkservice">NetworkService</a> (unsigned long index);
239
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parents: 238
diff changeset
   717
  <a href="#networkservice">NetworkService</a>? <a href=
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   718
"#dom-networkservices-getservicebyid">getServiceById</a>(DOMString id);
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   719
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   720
  readonly attribute unsigned long    <a href="#dom-networkservices-servicesavailable">servicesAvailable</a>;
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diff changeset
   721
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   722
  // event handler attributes
239
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   723
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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   724
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservices-onserviceavailable">onserviceavailable</a>;
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   725
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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diff changeset
   726
     class="externalDFN">EventHandler</a>     <a href=
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diff changeset
   727
     "#dom-networkservices-onserviceunavailable">onserviceunavailable</a>;
180
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diff changeset
   728
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diff changeset
   729
};
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diff changeset
   730
239
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   731
<a href="#networkservices">NetworkServices</a> implements <a href=
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diff changeset
   732
"http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#interface-eventtarget"
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diff changeset
   733
     class="externalDFN">EventTarget</a>;
180
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   734
</pre>
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   735
      <section>
239
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   736
        <h2>
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diff changeset
   737
          Attributes
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diff changeset
   738
        </h2>
180
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   739
        <dl class="domintro">
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   740
          <dt>
239
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   741
            <code title="dom-networkservices-length"><a href="#dom-networkservices-length">length</a></code>
180
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   742
          </dt>
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parents:
diff changeset
   743
          <dd>
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   744
            <p>
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diff changeset
   745
              Returns the current number of <a>indexed properties</a> in the current object's collection.
180
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   746
            </p>
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parents:
diff changeset
   747
          </dd>
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   748
          <dt>
239
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   749
            <code title="dom-networkservices-servicesavailable"><a href=
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   750
            "#dom-networkservices-servicesavailable">servicesAvailable</a></code>
180
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diff changeset
   751
          </dt>
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parents:
diff changeset
   752
          <dd>
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diff changeset
   753
            <p>
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   754
              Returns the current number of items matching one of the app-requested <a>valid service type</a> tokens in
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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   755
              the <a>list of available service records</a>.
180
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   756
            </p>
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parents:
diff changeset
   757
          </dd>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   758
        </dl>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   759
        <div>
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diff changeset
   760
          <p>
250
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diff changeset
   761
            The <dfn id="dom-networkservices-length"><code>length</code></dfn> attribute MUST return the number of
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   762
            <a href="#networkservice"><code>NetworkService</code></a> objects represented by the collection.
180
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   763
          </p>
239
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diff changeset
   764
          <p>
250
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diff changeset
   765
            The <dfn id="dom-networkservices-servicesavailable"><code>servicesAvailable</code></dfn> attribute MUST
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
   766
            return the number of services in the <a>list of available service records</a> whose <code>type</code>
437
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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parents: 402
diff changeset
   767
            attribute matches any of the <a>valid service type</a> tokens that were initially used to create the
d25229263a68 Change getNetworkServices API + associated algorithms to use DOM Promises
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diff changeset
   768
            current <a href="#networkservices"><code>NetworkServices</code></a> object.
239
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diff changeset
   769
          </p>
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diff changeset
   770
        </div>
180
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   771
      </section>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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   772
      <section>
239
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diff changeset
   773
        <h2>
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diff changeset
   774
          Methods
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diff changeset
   775
        </h2>
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diff changeset
   776
        <dl class="domintro">
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diff changeset
   777
          <dt>
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diff changeset
   778
            <code title="networkservices-getter"><a href="#networkservices">services</a></code> [ <var title=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   779
            "">index</var> ]
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   780
          </dt>
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diff changeset
   781
          <dd>
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diff changeset
   782
            <p>
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diff changeset
   783
              Returns the specified <a href="#networkservice"><code>NetworkService</code></a> object.
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parents: 238
diff changeset
   784
            </p>
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diff changeset
   785
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   786
          <dt>
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diff changeset
   787
            <code title="networkservices-getter"><a href="#networkservices">services</a></code> . <code title=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   788
            "dom-networkservices-getservicebyid"><a href=
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parents: 238
diff changeset
   789
            "#dom-networkservices-getservicebyid">getServiceById</a></code> ( <var title="">id</var> )
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   790
          </dt>
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parents: 238
diff changeset
   791
          <dd>
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parents: 238
diff changeset
   792
            <p>
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parents: 238
diff changeset
   793
              Returns the <a href="#networkservice"><code>NetworkService</code></a> object with the given identifier,
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   794
              or null if no service has that identifier.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   795
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   796
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   797
        </dl>
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parents: 238
diff changeset
   798
        <p>
371
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   799
          A <a href="#networkservices"><code>NetworkServices</code></a> object represents the current collection of
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
   800
          zero or more <a href="#networkservice"><code>NetworkService</code></a> objects - its <a>indexed
388
f6ad389be556 Update immutability defintion to clarify that only indexed properties of a NetworkServices object are immutable.
Rich Tibbett <richt@opera.com>
parents: 387
diff changeset
   801
          properties</a>. The <a>indexed properties</a> of a <a href=
f6ad389be556 Update immutability defintion to clarify that only indexed properties of a NetworkServices object are immutable.
Rich Tibbett <richt@opera.com>
parents: 387
diff changeset
   802
          "#networkservices"><code>NetworkServices</code></a> object are <span>immutable</span> meaning that <a>indexed
f6ad389be556 Update immutability defintion to clarify that only indexed properties of a NetworkServices object are immutable.
Rich Tibbett <richt@opera.com>
parents: 387
diff changeset
   803
          properties</a> cannot be added and <a>indexed properties</a> cannot be removed for the lifetime of a <a href=
f6ad389be556 Update immutability defintion to clarify that only indexed properties of a NetworkServices object are immutable.
Rich Tibbett <richt@opera.com>
parents: 387
diff changeset
   804
          "#networkservices"><code>NetworkServices</code></a> object.
239
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parents: 238
diff changeset
   805
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   806
        <p>
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parents: 238
diff changeset
   807
          The <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   808
          "http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#supported-property-indices"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   809
             class="externalDFN">supported property indices</a> of <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   810
             "#networkservices"><code>NetworkServices</code></a> objects at any instant are the numbers from zero to
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   811
             the number of the <a href="#networkservice"><code>NetworkService</code></a> objects in the collection
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   812
             minus one.
239
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parents: 238
diff changeset
   813
        </p>
398
19eb703af1c9 Minor editorial changes to NSD spec
Rich Tibbett <richt@opera.com>
parents: 397
diff changeset
   814
        <p class="note">
19eb703af1c9 Minor editorial changes to NSD spec
Rich Tibbett <richt@opera.com>
parents: 397
diff changeset
   815
          Each service in a <a href="#networkservices"><code>NetworkServices</code></a> object thus has an index; the
19eb703af1c9 Minor editorial changes to NSD spec
Rich Tibbett <richt@opera.com>
parents: 397
diff changeset
   816
          first has the index 0, and each subsequent service is numbered one higher than the previous one.
19eb703af1c9 Minor editorial changes to NSD spec
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parents: 397
diff changeset
   817
        </p>
239
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parents: 238
diff changeset
   818
        <p>
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parents: 238
diff changeset
   819
          To <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   820
          "http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#determine-the-value-of-an-indexed-property"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   821
             class="externalDFN">determine the value of an indexed property</a> for a given index <var>index</var> in a
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   822
             <a href="#networkservices"><code>NetworkServices</code></a> object the user agent MUST return the <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   823
             "#networkservice"><code>NetworkService</code></a> object that represents the <var>index</var>th item in
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   824
             the collection.
239
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parents: 238
diff changeset
   825
        </p>
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parents: 238
diff changeset
   826
        <p>
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parents: 238
diff changeset
   827
          The <dfn id="dom-networkservices-getservicebyid"><code>getServiceById(id)</code></dfn> method <em class=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   828
          "ct">MUST</em> return the first <a href="#networkservice"><code>NetworkService</code></a> object in the
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   829
          collection whose <a href="#dom-networkservice-id"><code>id</code></a> attribute is equal to the value of the
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   830
          <var>id</var> argument provided. When no <a href="#networkservice"><code>NetworkService</code></a> objects
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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parents: 243
diff changeset
   831
          match the given argument, the method MUST return null.
239
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parents: 238
diff changeset
   832
        </p>
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   833
      </section>
239
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parents: 238
diff changeset
   834
      <section>
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parents: 238
diff changeset
   835
        <h2>
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parents: 238
diff changeset
   836
          Events
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parents: 238
diff changeset
   837
        </h2>
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parents: 238
diff changeset
   838
        <p>
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diff changeset
   839
          The following are the event handlers (and their corresponding event handler event types) that <em class=
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diff changeset
   840
          "ct">MUST</em> be supported, as IDL attributes, by all objects implementing the <a href=
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parents: 238
diff changeset
   841
          "#networkservices"><code>NetworkServices</code></a> interface:
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diff changeset
   842
        </p>
243
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diff changeset
   843
        <table border="1">
239
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diff changeset
   844
          <thead>
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   845
            <tr>
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diff changeset
   846
              <th>
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diff changeset
   847
                <span title="event handlers">Event handler</span>
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diff changeset
   848
              </th>
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diff changeset
   849
              <th>
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diff changeset
   850
                <span>Event handler event type</span>
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diff changeset
   851
              </th>
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diff changeset
   852
            </tr>
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diff changeset
   853
          </thead>
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diff changeset
   854
          <tbody>
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diff changeset
   855
            <tr>
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diff changeset
   856
              <td>
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diff changeset
   857
                <dfn id="dom-networkservices-onserviceavailable"
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   858
                    title="dom-NetworkServices-onserviceavailable"><code>onserviceavailable</code></dfn>
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diff changeset
   859
              </td>
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diff changeset
   860
              <td>
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diff changeset
   861
                <a href="#event-serviceavailable"><code>serviceavailable</code></a>
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diff changeset
   862
              </td>
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diff changeset
   863
            </tr>
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diff changeset
   864
            <tr>
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diff changeset
   865
              <td>
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diff changeset
   866
                <dfn id="dom-networkservices-onserviceunavailable"
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diff changeset
   867
                    title="dom-NetworkServices-onserviceunavailable"><code>onserviceunavailable</code></dfn>
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diff changeset
   868
              </td>
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diff changeset
   869
              <td>
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diff changeset
   870
                <a href="#event-serviceunavailable"><code>serviceunavailable</code></a>
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diff changeset
   871
              </td>
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parents: 238
diff changeset
   872
            </tr>
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parents: 238
diff changeset
   873
          </tbody>
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parents: 238
diff changeset
   874
        </table>
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diff changeset
   875
      </section>
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   876
    </section>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   877
    <section>
239
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diff changeset
   878
      <h2>
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diff changeset
   879
        Communicating with a networked service
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   880
      </h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   881
      <p>
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parents: 238
diff changeset
   882
        The <a href="#networkservice"><code>NetworkService</code></a> interface is used to provide a set of connection
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   883
        information for an HTTP service endpoint and if available, service events, running on a networked device.
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parents: 238
diff changeset
   884
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   885
      <pre class="widl">
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   886
[NoInterfaceObject]
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   887
interface <dfn id="networkservice">NetworkService</dfn> {
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   888
  readonly attribute DOMString        <a href="#dom-networkservice-id">id</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   889
  readonly attribute DOMString        <a href="#dom-networkservice-name">name</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   890
  readonly attribute DOMString        <a href="#dom-networkservice-type">type</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   891
  readonly attribute DOMString        <a href="#dom-networkservice-url">url</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   892
  readonly attribute DOMString        <a href="#dom-networkservice-config">config</a>;
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   893
191
5e0da09685f7 Discovery API updates following feedback from http://lists.w3.org/Archives/Public/public-device-apis/2012Aug/0016.html
Rich Tibbett <richt@opera.com>
parents: 180
diff changeset
   894
  readonly attribute boolean          <a href="#dom-networkservice-online">online</a>;
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   895
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   896
  // event handler attributes
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   897
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   898
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservice-onserviceonline">onserviceonline</a>;
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   899
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   900
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservice-onserviceoffline">onserviceoffline</a>;
191
5e0da09685f7 Discovery API updates following feedback from http://lists.w3.org/Archives/Public/public-device-apis/2012Aug/0016.html
Rich Tibbett <richt@opera.com>
parents: 180
diff changeset
   901
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   902
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   903
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservice-onnotify">onnotify</a>;
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   904
};
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   905
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   906
<a href="#networkservice">NetworkService</a> implements <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   907
"http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#interface-eventtarget"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   908
     class="externalDFN">EventTarget</a>;
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   909
</pre>
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   910
      <section>
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parents: 238
diff changeset
   911
        <h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   912
          Attributes
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   913
        </h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   914
        <dl class="domintro">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   915
          <dt>
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parents: 238
diff changeset
   916
            <var title="">service</var> . <code title="dom-networkservice-id"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   917
            "#dom-networkservice-id">id</a></code>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   918
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   919
          <dd>
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parents: 238
diff changeset
   920
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   921
              A unique identifier for the given user-selected service instance.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   922
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   923
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   924
          <dt>
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parents: 238
diff changeset
   925
            <var title="">service</var> . <code title="dom-networkservice-name"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   926
            "#dom-networkservice-name">name</a></code>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   927
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   928
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   929
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   930
              The name of the user-selected service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   931
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   932
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   933
          <dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   934
            <var title="">service</var> . <code title="dom-networkservice-type"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   935
            "#dom-networkservice-type">type</a></code>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   936
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   937
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   938
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   939
              The <a>valid service type</a> token value of the user-selected service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   940
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   941
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   942
          <dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   943
            <var title="">service</var> . <code title="dom-networkservice-url"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   944
            "#dom-networkservice-url">url</a></code>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   945
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   946
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   947
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   948
              The control URL endpoint (including any required port information) of the user-selected control service
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   949
              that has been added to the <a>entry script origin's URL whitelist</a>.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   950
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   951
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   952
          <dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   953
            <var title="">service</var> . <code title="dom-networkservice-config"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   954
            "#dom-networkservice-config">config</a></code>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   955
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   956
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   957
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   958
              The configuration information associated with the service depending on the requested service type.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   959
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   960
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   961
        </dl>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   962
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   963
          The <dfn id="dom-networkservice-id"><code>id</code></dfn> attribute is a unique identifier for the service.
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   964
          The same service provided at different times or on different objects MUST have the same <a href=
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
   965
          "#dom-networkservice-id"><code>id</code></a> value.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   966
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   967
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   968
          The <dfn id="dom-networkservice-name"><code>name</code></dfn> attribute represents a human-readable title for
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   969
          the service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   970
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   971
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   972
          The <dfn id="dom-networkservice-type"><code>type</code></dfn> attribute reflects the value of the <a>valid
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   973
          service type</a> of the service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   974
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   975
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   976
          The <dfn id="dom-networkservice-url"><code>url</code></dfn> attribute is an <a href=
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diff changeset
   977
          "http://www.w3.org/TR/html5/urls.html#absolute-url"
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parents: 238
diff changeset
   978
             class="externalDFN">absolute URL</a> pointing to the root HTTP endpoint for the service that has been
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parents: 238
diff changeset
   979
             added to the <a>entry script origin's URL whitelist</a>. Web pages can subsequently use this value for
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parents: 238
diff changeset
   980
             implicit cross-document messaging via various existing mechanisms (e.g. Web Sockets, Server-Sent Events,
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diff changeset
   981
             Web Messaging, XMLHttpRequest).
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parents: 238
diff changeset
   982
        </p>
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parents: 238
diff changeset
   983
        <p>
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diff changeset
   984
          The <dfn id="dom-networkservice-config"><code>config</code></dfn> attribute provides the raw configuration
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diff changeset
   985
          information extracted from the given network service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   986
        </p>
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parents: 238
diff changeset
   987
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   988
      <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   989
        <h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   990
          States
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   991
        </h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   992
        <dl class="domintro">
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parents: 238
diff changeset
   993
          <dt>
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parents: 238
diff changeset
   994
            <var title="">service</var> . <code title="dom-networkservice-online"><a href=
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parents: 238
diff changeset
   995
            "#dom-networkservice-online">online</a></code>
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   996
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   997
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   998
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   999
              Returns <code>true</code> if the service is reporting that it is accessible on the local network or
390
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
  1000
              <code>false</code> if the service is no longer accessible (temporarily or permanently) on the local
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
  1001
              network.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
  1002
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1003
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1004
        </dl>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1005
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1006
          The <dfn id="dom-networkservice-online"><code>online</code></dfn> attribute indicates whether the service is
390
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
  1007
          either <var>online</var>, and therefore accessible on the local network, in which case this attribute will
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
  1008
          return <code>true</code> or, <var>offline</var>, and therefore not accessible on the local network, either
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
  1009
          temporarily or permanently, in which case this attribute will return <code>false</code>. This attribute MUST
6211d232766d Update spec to clarify that devices don't (necessarily) report themselves as offline
Rich Tibbett <richt@opera.com>
parents: 388
diff changeset
  1010
          default to <code>true</code>.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
  1011
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1012
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1013
      <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1014
        <h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1015
          Events
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1016
        </h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1017
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
  1018
          The following are the event handlers (and their corresponding event handler event types) that <em class=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1019
          "ct">MUST</em> be supported, as IDL attributes, by all objects implementing the <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1020
          "#networkservice"><code>NetworkService</code></a> interface:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1021
        </p>
243
220f3226b2a1 Apply pub rules to proposed Working Draft update
Rich Tibbett <richt@opera.com>
parents: 241
diff changeset
  1022
        <table border="1">
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1023
          <thead>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1024
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1025
              <th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1026
                <span title="event handlers">Event handler</span>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1027
              </th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1028
              <th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1029
                <span>Event handler event type</span>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1030
              </th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1031
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1032
          </thead>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1033
          <tbody>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1034
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1035
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1036
                <dfn id="dom-networkservice-onnotify"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1037
                    title="dom-NetworkService-onnotify"><code>onnotify</code></dfn>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1038
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1039
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1040
                <a href="#event-notify"><code>notify</code></a>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1041
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1042
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1043
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1044
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1045
                <dfn id="dom-networkservice-onserviceonline"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1046
                    title="dom-NetworkService-onserviceonline"><code>onserviceonline</code></dfn>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1047
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1048
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1049
                <a href="#event-serviceonline"><code>serviceonline</code></a>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1050
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1051
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1052
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1053
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1054
                <dfn id="dom-networkservice-onserviceoffline"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1055
                    title="dom-NetworkService-onserviceoffline"><code>onserviceoffline</code></dfn>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1056
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1057
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1058
                <a href="#event-serviceoffline"><code>serviceoffline</code></a>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1059
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1060
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1061
          </tbody>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1062
        </table>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1063
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1064
    </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1065
    <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1066
      <h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1067
        Service Discovery
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1068
      </h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1069
      <p>
243
220f3226b2a1 Apply pub rules to proposed Working Draft update
Rich Tibbett <richt@opera.com>
parents: 241
diff changeset
  1070
        A <a>user agent</a> conforming to this specification MAY implement <abbr title=
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1071
        "Simple Service Discovery Protocol">SSDP</abbr> [[!UPNP-DEVICEARCH11]], Zeroconf [[!DNS-SD]] + [[!MDNS]] and/or
371
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
  1072
        <abbr title="Discovery and Launch Protocol">DIAL</abbr> [<a href=
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
  1073
        "https://sites.google.com/a/dial-multiscreen.org/dial/dial-protocol-specification">DIAL</a>] <dfn>service
8b03e17da083 Rewrite Step 9 of getNetworkService algorithm following feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Sep/0141.html
Rich Tibbett <richt@opera.com>
parents: 332
diff changeset
  1074
        discovery mechanisms</dfn> - the requirements detailed in this section of the specification - to enable Web
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1075
        pages to request and connect with HTTP services running on networked devices, discovered via any of these
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1076
        mechanisms, through this API. When a <a>user agent</a> implements any of these <a>service discovery
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1077
        mechanisms</a>, then it MUST conform to the corresponding algorithms provided in this section of the
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1078
        specification.
239
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1079
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1080
      <p>
373
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1081
        This section presents how the results of these <a>service discovery mechanisms</a> will be matched to requested
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1082
        service types, how the user agent stores available and active services and how their properties are applied to
bc1d9819cad3 Clarify rules for 'adding an available service' and 'removing an available service' from http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0020.html
Rich Tibbett <richt@opera.com>
parents: 372
diff changeset
  1083
        any resulting <a href="#networkservice"><code>NetworkService</code></a> objects.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1084
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1085
      <p>
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1086
        It is expected that user agents will perform these <a>service discovery mechanisms</a> asynchronously and
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1087
        periodically update the <a>list of available service records</a> as required. The timing of any <a>service
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1088
        discovery mechanisms</a> is an implementation detail left to the discretion of the implementer (e.g. by
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1089
        continuously monitoring the network as a background process or on invocation of this API from a Web page).
239
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Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1090
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1091
      <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1092
        The <dfn>list of available service records</dfn> is a single dynamic internal lookup table within user agents
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1093
        that is used to track all the services that have been discovered and are available in the current network at
440
fcbaadc4fd54 Fix [DAP-ISSUE-135]: Add security and privacy considerations section [Network Service Discovery]
Rich Tibbett <richt@opera.com>
parents: 438
diff changeset
  1094
        the current time. At any point during the running of any of the <a>service discovery mechanisms</a> then
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1095
        existing entries within this table can be updated, entries can be added and entries can be removed as the
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1096
        status of networked services changes according to the rules defined in this specification.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1097
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1098
      <p>
250
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1099
        The <dfn>list of active service managers</dfn> is an internal list within user agents that is used to track all
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  1100
        <a href="#networkservices"><code>NetworkServices</code></a> objects currently being shared with any web pages
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diff changeset
  1101
        at the current time within the user agent. Each <a href="#networkservices"><code>NetworkServices</code></a>
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diff changeset
  1102
        object in the <a>list of active service managers</a> represents a collection of zero or more <a href=
250
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diff changeset
  1103
        "#networkservice"><code>NetworkService</code></a> objects - known as its <dfn>indexed properties</dfn>.
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diff changeset
  1104
        <a href="#networkservice"><code>NetworkService</code></a> objects are attached as the <a>indexed properties</a>
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diff changeset
  1105
        of a <a href="#networkservices"><code>NetworkServices</code></a> object as part of the <a href=
239
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diff changeset
  1106
        "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> algorithm.
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parents: 238
diff changeset
  1107
      </p>
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parents: 238
diff changeset
  1108
      <p>
387
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
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diff changeset
  1109
        The rule for <dfn>adding an available service</dfn> is the process of adding a <a>new service</a> or updating
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parents: 378
diff changeset
  1110
        an <a>existing service</a> that is generally available on the user's current network in the <a>list of
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diff changeset
  1111
        available service records</a>. This rule takes one argument, <var>network service record</var>, and consists of
abb49f62a775 Clarify the terms 'new service', 'existing service' and 'current service'
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diff changeset
  1112
        running the following steps:
239
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diff changeset
  1113
      </p>
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diff changeset
  1114
      <ol class="rule">
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diff changeset
  1115
        <li>For each <var>existing service record</var> in the current <a>list of available service records</a>, run
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diff changeset
  1116
        the following sub-steps:
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parents: 238
diff changeset
  1117
          <ol class="rule">
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diff changeset
  1118
            <li>If the <var>existing service record</var>'s <code>id</code> property does not equal <var>network
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parents: 238
diff changeset
  1119
            service record</var>'s <code>id</code> property then abort any remaining sub-steps and continue at the next
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diff changeset
  1120
            available <var>existing service record</var>.
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parents: 238
diff changeset
  1121
            </li>
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diff changeset
  1122
            <li>Replace the value of <var>existing service record</var> in the current <a>list of available service
373
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diff changeset
  1123
            records</a> with the value of <var>network service record</var>, aborting any remaining steps in this
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diff changeset
  1124
            algorithm and return.
239
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diff changeset
  1125
            </li>
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parents: 238
diff changeset
  1126
          </ol>
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diff changeset
  1127
        </li>
373
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diff changeset
  1128
        <li>Add <var>network service record</var> to the <a>list of available service records</a> as a new item.
239
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diff changeset
  1129
        </li>
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  1130
        <li>For each <var>service manager</var> in the <a>list of active service managers</a> run the following steps:
239
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diff changeset
  1131
          <ol class="rule">
250
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diff changeset
  1132
            <li>For each <var>active service</var> in <var>service manager</var> run the following steps:
8b912f2bb9c7 Updates to Service Discovery & Messaging according to feedback @ http://lists.w3.org/Archives/Public/public-device-apis/2012Oct/0005.html
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diff changeset
  1133
              <ol class="rule">
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diff changeset
  1134
                <li>If the <var>network service record</var>'s <code>id</code> pr