discovery-api/Overview.src.html
author Rich Tibbett <richt@opera.com>
Mon, 04 Feb 2013 16:02:58 +0100
changeset 376 631133236bc9
parent 375 f290bbd84426
child 377 a311e7fe116c
permissions -rw-r--r--
Update 'Network Topology Monitoring' to clarify that only services discovered via a particular network interface that has now been dropped should be removed.
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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:  "2012-10-04",
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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: "2012-08-07",
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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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              name:       "Clarke Stevens",
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              //url:      "",
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              company:    "CableLabs",
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              companyURL: "http://cablelabs.com/"
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            }
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          ],
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          noIDLIn:      true,
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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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      };
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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 type="text/css">
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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 red; background: #F7DFE5; 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: red; color: white; position: absolute; top: 0; margin: -1px 0 0 -7.6em; width: 5em; border: thin solid red; 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; }
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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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  </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 the necessary information to
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        communicate with the authorized Local-networked Service. If the request fails then the Web page will receive an
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        error callback containing an error code describing 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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      <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', 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', 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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], showServices);
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</pre>
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      </div>
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      <p>
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        For more detailed examples see the <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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    </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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  // Obtain a Local-networked Service
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  void <a href="#dom-navigator-getnetworkservices">getNetworkServices</a>( in any type,
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                           in <a href=
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"#navigatornetworkservicesuccesscallback">NavigatorNetworkServiceSuccessCallback</a> successCallback,
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                           in optional <a href=
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"#navigatornetworkserviceerrorcallback">NavigatorNetworkServiceErrorCallback</a> errorCallback );
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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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[Callback=FunctionOnly, NoInterfaceObject]
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interface <dfn id="navigatornetworkservicesuccesscallback">NavigatorNetworkServiceSuccessCallback</dfn> {
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  void handleEvent( in <a href="#networkservices">NetworkServices</a> services );
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};
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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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[Callback=FunctionOnly, NoInterfaceObject]
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interface <dfn id="navigatornetworkserviceerrorcallback">NavigatorNetworkServiceErrorCallback</dfn> {
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  void handleEvent( in <a href="#navigatornetworkserviceerror">NavigatorNetworkServiceError</a> error );
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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="">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> , <var title=
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            "">successCallback</var> [, <var title="">errorCallback</var> ] )
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          </dt>
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          <dd>
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            <p>
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              Prompts the user to select discovered network services that have advertised support for the requested
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              service type.
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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="">successCallback</var> is invoked, with zero or more <a href=
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              "#networkservice"><code>NetworkService</code></a> objects as its argument.
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            </p>
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            <p>
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              If the user declines, the <var title="">errorCallback</var> (if any) is invoked.
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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, successCallback[,
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               errorCallback])</code></dfn> method is called, 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>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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            below. Otherwise, the <a>user agent</a> MUST <a href=
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            "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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                  class="externalDFN">queue a task</a> to invoke <var>errorCallback</var>, if it is provided and is an
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                  object of type <code>Function</code>, with 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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                service</var>'s <code>type</code> attribute equals the <var>requested control type</var> then let <var>
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                  matched service</var> equal the value of <var>available service</var> and continue at the step
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                  labeled <var>attach</var> below.
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                </li>
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                <li>Continue at the next <var>available service</var>.
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                </li>
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                <li>
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                  <em>Attach</em>: If <var>matched service</var> is not empty then run the following steps:
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                  <ol class="rule">
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                    <li>Let <var>new service object</var> be a new <a href=
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                    "#networkservice"><code>NetworkService</code></a> object, mapping the parameters of <var>matched
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                    service</var> to this new object where possible.
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                    </li>
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                    <li>Append <var>new service object</var> to the <var>services found</var> array.
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                    </li>
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                  </ol>
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                </li>
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              </ol>
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            </li>
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            <li>Return, and run the remaining steps asynchronously.
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            </li>
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            <li>Optionally, e.g. based on a previously-established user preference, for security reasons, or due to
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            platform limitations, the <a>user agent</a> MAY <a href=
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            "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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                  class="externalDFN">queue a task</a> to invoke <var>errorCallback</var>, if it is provided and is an
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                  object of type <code>Function</code>, with 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 1
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                  (<a href=
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                  "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a>) as its
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                  argument, abort any remaining steps and return.
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            </li>
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            <li>The user agent MUST NOT provide the entry script's origin with a <a href=
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            "#networkservices"><code>NetworkServices</code></a> object without prior permission given by the user.
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              <p>
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                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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                user in a user-agent-specific manner for permission to provide the <a href=
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                "http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
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                   class="externalDFN">entry script</a>'s <a href=
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                   "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
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                   class="externalDFN">origin</a> with a <a href="#networkservices"><code>NetworkServices</code></a>
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                   object representing the <a>user-authorized</a> subset of <var>services found</var>.
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              </p>
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              <p>
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                Alternatively, the user agent MAY choose to queue a task to invoke <var>successCallback</var> or
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                <var>errorCallback</var> immediately based on a previously-established user preference, for security
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                reasons, or due to platform limitations. In such an implementation, if <var>successCallback</var> is to
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                be fired as a result of a previously-established user preference then the <a>user agent</a> MUST
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                continue at the next step of this algorithm.
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              </p>
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              <p>
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                If permission has been granted by the user to access one or more networked services then the <a>user
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                agent</a> SHOULD include an "ongoing local-network communication" indicator.
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              </p>
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              <p>
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                If permission has been denied by the user, <a>user agent</a> or platform, then the <a>user agent</a>
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                MUST <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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                   class="externalDFN">queue a task</a> to invoke <var>errorCallback</var>, if it is provided and is an
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                   object of type <code>Function</code>, with 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 1
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                   (<a href=
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                   "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a>) as its
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                   argument, abort any remaining steps and return.
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              </p>
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              <p>
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                If the user never responds or no previously-established user preference has been met, this algorithm
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                stalls on this step.
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              </p>
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            </li>
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            <li>Let <var>services</var> be an empty array.
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            </li>
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            <li>If <var>services found</var> is not an empty array then set <var>services</var> to be an array of one
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            or more <a href="#networkservice"><code>NetworkService</code></a> objects for which the user granted
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            permission above - known as the current objects <dfn>user-authorized</dfn> services.
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            </li>
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            <li>For each Object <var>service</var> in <var>services</var>, if any, run the following sub-steps:
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              <ol class="rule">
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                <li>Add the <var>service</var>'s <code>url</code> parameter to the <a>entry script origin's
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                  <abbr title="Uniform Resource Locator">URL</abbr> whitelist</a>.
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                </li>
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                <li>If <var>service</var>'s <code>type</code> parameter begins with the DOMString "<code>upnp:</code>"
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                and the <var>service</var>'s <code>eventsUrl</code> parameter is not empty then <a>setup a UPnP Events
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                Subscription</a> for <var>service</var>.
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                </li>
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              </ol>
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            </li>
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            <li>Let <var>services manager</var> be a new <a href="#networkservices"><code>NetworkServices</code></a>
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            object.
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            </li>
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            <li>Store <var>requested control types</var> against <var>services manager</var> as an internal variable.
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            </li>
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            <li>Set <var>services manager</var>'s <a href=
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   489
            "#dom-networkservices-servicesavailable"><code>servicesAvailable</code></a> attribute to the number of
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   490
            items currently found in the <a>list of available service records</a> whose <code>type</code> property
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   491
            matches any of the tokens requested in <var>requested control types</var>.
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   492
            </li>
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   493
            <li>Add <var>services</var>, if any, to the <var>services manager</var> object as its collection of
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   494
            <a>indexed properties</a>. If <var>services</var> is an empty array then the <var>services manager</var>
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   495
            does not have any <var>indexed properties</var>.
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   496
            </li>
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   497
            <li>Set <var>services manager</var>'s <a href="#dom-networkservices-length"><code>length</code></a>
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   498
            attribute to the number of items in <var>services</var>.
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   499
            </li>
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   500
            <li>Add <var>services manager</var> to the <a>list of active service managers</a>.
239
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   501
            </li>
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   502
            <li>The <a>user agent</a> MUST <a href=
239
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   503
            "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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   504
                  class="externalDFN">queue a task</a> to invoke <var>successCallback</var> with <var>services
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   505
                  manager</var> as its argument.
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   506
            </li>
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   507
          </ol>
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   508
          <p>
239
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   509
            The <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#task-source"
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   510
               class="externalDFN">task source</a> for these <a href=
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diff changeset
   511
               "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#concept-task"
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   512
               class="externalDFN">tasks</a> is the <a href=
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   513
               "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#user-interaction-task-source"
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   514
               class="externalDFN">user interaction task source</a>.
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diff changeset
   515
          </p>
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   516
          <p>
239
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   517
            When a <a href="#networkservice"><code>NetworkService</code></a> object is provided to a Web page, the
250
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   518
            <a>user agent</a> MUST add the <code>url</code> property to the <dfn>entry script origin's URL
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diff changeset
   519
            whitelist</dfn>. This list enables the Web page to override and initiate cross-site resource requests
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   520
            towards these URLs, and any sub-resources of these URLs, within the current <a href=
239
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   521
            "http://www.whatwg.org/specs/web-apps/current-work/complete/browsers.html#entry-script"
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   522
               class="externalDFN">entry script</a>'s <a href=
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diff changeset
   523
               "http://www.whatwg.org/specs/web-apps/current-work/complete/origin-0.html#origin"
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diff changeset
   524
               class="externalDFN">origin</a> via various existing mechanisms (e.g. Web Sockets, Server-Sent Events,
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diff changeset
   525
               Web Messaging, XMLHttpRequest).
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   526
          </p>
239
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   527
          <p>
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diff changeset
   528
            If the user navigates away from the <a href=
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diff changeset
   529
            "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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diff changeset
   530
               class="externalDFN">entry script</a>'s <a href=
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diff changeset
   531
               "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
   532
               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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diff changeset
   533
               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
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diff changeset
   534
               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
   535
               networked service without the necessary user authorization in all of the following cases:
239
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diff changeset
   536
          </p>
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diff changeset
   537
          <ul>
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diff changeset
   538
            <li>If the current script is reloaded at any point in the same or different window.
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diff changeset
   539
            </li>
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diff changeset
   540
            <li>if the current script reinvokes the <a href=
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diff changeset
   541
            "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> method at any point in its
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diff changeset
   542
            execution.
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diff changeset
   543
            </li>
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diff changeset
   544
            <li>If the user navigates forward or back in their history to reload the current page.
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diff changeset
   545
            </li>
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diff changeset
   546
            <li>If a script is running in a different origin.
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diff changeset
   547
            </li>
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diff changeset
   548
          </ul>
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diff changeset
   549
        </div>
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   550
      </section>
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diff changeset
   551
      <section>
239
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diff changeset
   552
        <h3>
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diff changeset
   553
          Error Handling
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diff changeset
   554
        </h3>
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diff changeset
   555
        <dl class="domintro">
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diff changeset
   556
          <dt>
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diff changeset
   557
            <var title="">error</var> . <code title="dom-NavigatorNetworkServiceError-code"><a href=
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diff changeset
   558
            "#dom-navigatornetworkserviceerror-code">code</a></code>
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diff changeset
   559
          </dt>
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diff changeset
   560
          <dd>
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diff changeset
   561
            <p>
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diff changeset
   562
              Returns the current error's error code. At the current time, this will be <code>1</code> or
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diff changeset
   563
              <code>2</code>, for which the corresponding error constants <a href=
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diff changeset
   564
              "#dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></a> and <a href=
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diff changeset
   565
              "#dom-navigatornetworkserviceerror-unknown_type_prefix"><code>UNKNOWN_TYPE_PREFIX_ERR</code></a> are
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diff changeset
   566
              defined.
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diff changeset
   567
            </p>
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diff changeset
   568
          </dd>
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diff changeset
   569
        </dl>
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diff changeset
   570
        <p>
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diff changeset
   571
          The <dfn id="dom-navigatornetworkserviceerror-code"
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diff changeset
   572
             title="dom-navigatornetworkserviceerror-code"><code>code</code></dfn> attribute of a <a href=
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diff changeset
   573
             "#navigatornetworkserviceerror"><code>NavigatorNetworkServiceError</code></a> object <em class=
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diff changeset
   574
             "ct">MUST</em> return the code for the error, which will be one of the following:
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diff changeset
   575
        </p>
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diff changeset
   576
        <dl>
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diff changeset
   577
          <dt>
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diff changeset
   578
            <dfn id="dom-navigatornetworkserviceerror-permission_denied"
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diff changeset
   579
                title="dom-navigatornetworkserviceerror-permission_denied"><code>PERMISSION_DENIED_ERR</code></dfn>
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diff changeset
   580
                (numeric value 1)
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diff changeset
   581
          </dt>
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diff changeset
   582
          <dd>
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diff changeset
   583
            The user or user agent denied the page permission to access any services.
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diff changeset
   584
          </dd>
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diff changeset
   585
          <dt>
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diff changeset
   586
            <dfn id="dom-navigatornetworkserviceerror-unknown_type_prefix"
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diff changeset
   587
                title="dom-navigatornetworkserviceerror-unknown_type_prefix"><code>UNKNOWN_TYPE_PREFIX_ERR</code></dfn>
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diff changeset
   588
                (numeric value 2)
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parents: 238
diff changeset
   589
          </dt>
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diff changeset
   590
          <dd>
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diff changeset
   591
            No <a>valid service type</a> tokens were provided in the method invocation.
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diff changeset
   592
          </dd>
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diff changeset
   593
        </dl>
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diff changeset
   594
      </section>
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diff changeset
   595
    </section>
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diff changeset
   596
    <section>
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diff changeset
   597
      <h2>
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diff changeset
   598
        Obtaining networked services
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diff changeset
   599
      </h2>
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   600
      <p>
371
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diff changeset
   601
        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
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diff changeset
   602
        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
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diff changeset
   603
        "#networkservice"><code>NetworkService</code></a> object.
254
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diff changeset
   604
      </p>
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diff changeset
   605
      <p>
f29ec967fb3b Editorial updates to NSD spec
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parents: 250
diff changeset
   606
        A <a href="#networkservices"><code>NetworkServices</code></a> object is the top level success callback
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   607
        parameter from a call to <a href="#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a>.
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   608
      </p>
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   609
      <pre class="widl">
180
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   610
[NoInterfaceObject]
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   611
interface <dfn id="networkservices">NetworkServices</dfn> {
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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   612
  readonly attribute unsigned long    <a href="#dom-networkservices-length">length</a>;
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   613
  getter <a href="#networkservice">NetworkService</a> (unsigned long index);
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   614
  <a href="#networkservice">NetworkService</a>? <a href=
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   615
"#dom-networkservices-getservicebyid">getServiceById</a>(DOMString id);
180
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diff changeset
   616
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diff changeset
   617
  readonly attribute unsigned long    <a href="#dom-networkservices-servicesavailable">servicesAvailable</a>;
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diff changeset
   618
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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   619
  // event handler attributes
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   620
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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   621
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservices-onserviceavailable">onserviceavailable</a>;
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   622
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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   623
     class="externalDFN">EventHandler</a>     <a href=
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   624
     "#dom-networkservices-onserviceunavailable">onserviceunavailable</a>;
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   625
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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diff changeset
   626
};
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diff changeset
   627
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   628
<a href="#networkservices">NetworkServices</a> implements <a href=
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   629
"http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#interface-eventtarget"
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   630
     class="externalDFN">EventTarget</a>;
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   631
</pre>
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   632
      <section>
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   633
        <h2>
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   634
          Attributes
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   635
        </h2>
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   636
        <dl class="domintro">
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   637
          <dt>
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   638
            <code title="dom-networkservices-length"><a href="#dom-networkservices-length">length</a></code>
180
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   639
          </dt>
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diff changeset
   640
          <dd>
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   641
            <p>
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   642
              Returns the current number of items in the current object's collection of <a href=
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   643
              "#networkservice"><code>NetworkService</code></a> objects.
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   644
            </p>
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diff changeset
   645
          </dd>
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   646
          <dt>
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   647
            <code title="dom-networkservices-servicesavailable"><a href=
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   648
            "#dom-networkservices-servicesavailable">servicesAvailable</a></code>
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   649
          </dt>
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diff changeset
   650
          <dd>
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   651
            <p>
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   652
              Returns the current number of items matching one of the app-requested <a>valid service type</a> tokens in
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   653
              the <a>list of available service records</a>.
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   654
            </p>
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diff changeset
   655
          </dd>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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diff changeset
   656
        </dl>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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diff changeset
   657
        <div>
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   658
          <p>
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   659
            The <dfn id="dom-networkservices-length"><code>length</code></dfn> attribute MUST return the number of
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   660
            <a href="#networkservice"><code>NetworkService</code></a> objects represented by the collection.
180
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   661
          </p>
239
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   662
          <p>
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   663
            The <dfn id="dom-networkservices-servicesavailable"><code>servicesAvailable</code></dfn> attribute MUST
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   664
            return the number of services in the <a>list of available service records</a> whose <code>type</code>
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   665
            attribute matches any of the <a>valid service type</a> tokens that was initially used to create the current
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   666
            <a href="#networkservices"><code>NetworkServices</code></a> object.
239
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diff changeset
   667
          </p>
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diff changeset
   668
        </div>
180
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   669
      </section>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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   670
      <section>
239
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diff changeset
   671
        <h2>
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diff changeset
   672
          Methods
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diff changeset
   673
        </h2>
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diff changeset
   674
        <dl class="domintro">
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diff changeset
   675
          <dt>
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diff changeset
   676
            <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
   677
            "">index</var> ]
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   678
          </dt>
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diff changeset
   679
          <dd>
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diff changeset
   680
            <p>
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diff changeset
   681
              Returns the specified <a href="#networkservice"><code>NetworkService</code></a> object.
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diff changeset
   682
            </p>
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diff changeset
   683
          </dd>
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diff changeset
   684
          <dt>
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   685
            <code title="networkservices-getter"><a href="#networkservices">services</a></code> . <code title=
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diff changeset
   686
            "dom-networkservices-getservicebyid"><a href=
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diff changeset
   687
            "#dom-networkservices-getservicebyid">getServiceById</a></code> ( <var title="">id</var> )
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diff changeset
   688
          </dt>
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diff changeset
   689
          <dd>
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diff changeset
   690
            <p>
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diff changeset
   691
              Returns the <a href="#networkservice"><code>NetworkService</code></a> object with the given identifier,
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diff changeset
   692
              or null if no service has that identifier.
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diff changeset
   693
            </p>
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diff changeset
   694
          </dd>
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diff changeset
   695
        </dl>
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diff changeset
   696
        <p>
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diff changeset
   697
          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
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diff changeset
   698
          zero or more <a href="#networkservice"><code>NetworkService</code></a> objects - its <a>indexed
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
   699
          properties</a>. A <a href="#networkservices"><code>NetworkServices</code></a> object is
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
   700
          <span>immutable</span> meaning that <a>indexed properties</a> cannot be added and <a>indexed properties</a>
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
   701
          cannot be removed for the lifetime of a <a href="#networkservices"><code>NetworkServices</code></a> object.
239
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diff changeset
   702
        </p>
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diff changeset
   703
        <p class="note">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   704
          Each service in a <a href="#networkservices"><code>NetworkServices</code></a> object thus has an index; the
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diff changeset
   705
          first has the index 0, and each subsequent service is numbered one higher than the previous one.
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diff changeset
   706
        </p>
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diff changeset
   707
        <p>
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diff changeset
   708
          The <a href=
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diff changeset
   709
          "http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#supported-property-indices"
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diff changeset
   710
             class="externalDFN">supported property indices</a> of <a href=
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diff changeset
   711
             "#networkservices"><code>NetworkServices</code></a> objects at any instant are the numbers from zero to
250
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diff changeset
   712
             the number of the <a href="#networkservice"><code>NetworkService</code></a> objects in the collection
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diff changeset
   713
             minus one.
239
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diff changeset
   714
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   715
        <p>
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diff changeset
   716
          To <a href=
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diff changeset
   717
          "http://www.whatwg.org/specs/web-apps/current-work/multipage/infrastructure.html#determine-the-value-of-an-indexed-property"
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diff changeset
   718
             class="externalDFN">determine the value of an indexed property</a> for a given index <var>index</var> in a
250
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diff changeset
   719
             <a href="#networkservices"><code>NetworkServices</code></a> object the user agent MUST return the <a href=
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diff changeset
   720
             "#networkservice"><code>NetworkService</code></a> object that represents the <var>index</var>th item in
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diff changeset
   721
             the collection.
239
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diff changeset
   722
        </p>
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diff changeset
   723
        <p>
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diff changeset
   724
          The <dfn id="dom-networkservices-getservicebyid"><code>getServiceById(id)</code></dfn> method <em class=
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diff changeset
   725
          "ct">MUST</em> return the first <a href="#networkservice"><code>NetworkService</code></a> object in the
250
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   726
          collection whose <a href="#dom-networkservice-id"><code>id</code></a> attribute is equal to the value of the
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   727
          <var>id</var> argument provided. When no <a href="#networkservice"><code>NetworkService</code></a> objects
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   728
          match the given argument, the method MUST return null.
239
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   729
        </p>
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   730
        <p>
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   731
          Services available within the local network can connect and disconnect at different times during the
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   732
          execution of a web page. A <a>user agent</a> can inform a web page when the state of networked services
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   733
          matching the requested <a>valid service type</a> change. Web pages can use this information to enable in-page
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   734
          experiences for communicating the state of networked services with the ability to change the particular
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   735
          service or set of services the page is connected to by re-invoking the <a href=
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diff changeset
   736
          "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> method.
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   737
        </p>
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   738
      </section>
239
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   739
      <section>
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diff changeset
   740
        <h2>
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   741
          Events
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   742
        </h2>
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   743
        <p>
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   744
          The following are the event handlers (and their corresponding event handler event types) that <em class=
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   745
          "ct">MUST</em> be supported, as IDL attributes, by all objects implementing the <a href=
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   746
          "#networkservices"><code>NetworkServices</code></a> interface:
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   747
        </p>
243
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diff changeset
   748
        <table border="1">
239
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diff changeset
   749
          <thead>
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   750
            <tr>
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   751
              <th>
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   752
                <span title="event handlers">Event handler</span>
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diff changeset
   753
              </th>
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   754
              <th>
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   755
                <span>Event handler event type</span>
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diff changeset
   756
              </th>
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diff changeset
   757
            </tr>
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diff changeset
   758
          </thead>
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diff changeset
   759
          <tbody>
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diff changeset
   760
            <tr>
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diff changeset
   761
              <td>
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diff changeset
   762
                <dfn id="dom-networkservices-onserviceavailable"
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   763
                    title="dom-NetworkServices-onserviceavailable"><code>onserviceavailable</code></dfn>
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diff changeset
   764
              </td>
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diff changeset
   765
              <td>
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diff changeset
   766
                <a href="#event-serviceavailable"><code>serviceavailable</code></a>
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diff changeset
   767
              </td>
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diff changeset
   768
            </tr>
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diff changeset
   769
            <tr>
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diff changeset
   770
              <td>
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diff changeset
   771
                <dfn id="dom-networkservices-onserviceunavailable"
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diff changeset
   772
                    title="dom-NetworkServices-onserviceunavailable"><code>onserviceunavailable</code></dfn>
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diff changeset
   773
              </td>
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diff changeset
   774
              <td>
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diff changeset
   775
                <a href="#event-serviceunavailable"><code>serviceunavailable</code></a>
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diff changeset
   776
              </td>
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parents: 238
diff changeset
   777
            </tr>
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parents: 238
diff changeset
   778
          </tbody>
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parents: 238
diff changeset
   779
        </table>
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diff changeset
   780
      </section>
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   781
    </section>
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   782
    <section>
239
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diff changeset
   783
      <h2>
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diff changeset
   784
        Communicating with a networked service
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parents: 238
diff changeset
   785
      </h2>
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diff changeset
   786
      <p>
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diff changeset
   787
        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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diff changeset
   788
        information for an HTTP service endpoint and if available, service events, running on a networked device.
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parents: 238
diff changeset
   789
      </p>
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parents: 238
diff changeset
   790
      <pre class="widl">
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
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parents:
diff changeset
   791
[NoInterfaceObject]
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   792
interface <dfn id="networkservice">NetworkService</dfn> {
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   793
  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
   794
  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
   795
  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
   796
  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
   797
  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
   798
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
   799
  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
   800
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   801
  // event handler attributes
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   802
           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
   803
     class="externalDFN">EventHandler</a>     <a href="#dom-networkservice-onserviceonline">onserviceonline</a>;
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   804
           attribute <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#eventhandler"
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parents: 238
diff changeset
   805
     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
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parents: 180
diff changeset
   806
239
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diff changeset
   807
           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
   808
     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
   809
};
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   810
239
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diff changeset
   811
<a href="#networkservice">NetworkService</a> implements <a href=
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parents: 238
diff changeset
   812
"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
   813
     class="externalDFN">EventTarget</a>;
180
ee3a89da06e1 First draft of Networked Service Discovery and Messaging
Rich Tibbett <richt@opera.com>
parents:
diff changeset
   814
</pre>
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   815
      <section>
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parents: 238
diff changeset
   816
        <h2>
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parents: 238
diff changeset
   817
          Attributes
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   818
        </h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   819
        <dl class="domintro">
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parents: 238
diff changeset
   820
          <dt>
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parents: 238
diff changeset
   821
            <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
   822
            "#dom-networkservice-id">id</a></code>
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parents: 238
diff changeset
   823
          </dt>
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parents: 238
diff changeset
   824
          <dd>
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diff changeset
   825
            <p>
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parents: 238
diff changeset
   826
              A unique identifier for the given user-selected service instance.
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parents: 238
diff changeset
   827
            </p>
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parents: 238
diff changeset
   828
          </dd>
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parents: 238
diff changeset
   829
          <dt>
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diff changeset
   830
            <var title="">service</var> . <code title="dom-networkservice-name"><a href=
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parents: 238
diff changeset
   831
            "#dom-networkservice-name">name</a></code>
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parents: 238
diff changeset
   832
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   833
          <dd>
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parents: 238
diff changeset
   834
            <p>
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diff changeset
   835
              The name of the user-selected service.
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parents: 238
diff changeset
   836
            </p>
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parents: 238
diff changeset
   837
          </dd>
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parents: 238
diff changeset
   838
          <dt>
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diff changeset
   839
            <var title="">service</var> . <code title="dom-networkservice-type"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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diff changeset
   840
            "#dom-networkservice-type">type</a></code>
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parents: 238
diff changeset
   841
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   842
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   843
            <p>
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diff changeset
   844
              The <a>valid service type</a> token value of the user-selected service.
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parents: 238
diff changeset
   845
            </p>
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parents: 238
diff changeset
   846
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   847
          <dt>
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parents: 238
diff changeset
   848
            <var title="">service</var> . <code title="dom-networkservice-url"><a href=
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parents: 238
diff changeset
   849
            "#dom-networkservice-url">url</a></code>
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parents: 238
diff changeset
   850
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   851
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   852
            <p>
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diff changeset
   853
              The control URL endpoint (including any required port information) of the user-selected control service
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parents: 238
diff changeset
   854
              that has been added to the <a>entry script origin's URL whitelist</a>.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   855
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   856
          </dd>
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parents: 238
diff changeset
   857
          <dt>
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parents: 238
diff changeset
   858
            <var title="">service</var> . <code title="dom-networkservice-config"><a href=
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diff changeset
   859
            "#dom-networkservice-config">config</a></code>
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parents: 238
diff changeset
   860
          </dt>
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parents: 238
diff changeset
   861
          <dd>
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parents: 238
diff changeset
   862
            <p>
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diff changeset
   863
              The configuration information associated with the service depending on the requested service type.
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diff changeset
   864
            </p>
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parents: 238
diff changeset
   865
          </dd>
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parents: 238
diff changeset
   866
        </dl>
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parents: 238
diff changeset
   867
        <p>
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diff changeset
   868
          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
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diff changeset
   869
          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
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parents: 243
diff changeset
   870
          "#dom-networkservice-id"><code>id</code></a> value.
239
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parents: 238
diff changeset
   871
        </p>
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parents: 238
diff changeset
   872
        <p>
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parents: 238
diff changeset
   873
          The <dfn id="dom-networkservice-name"><code>name</code></dfn> attribute represents a human-readable title for
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parents: 238
diff changeset
   874
          the service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   875
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   876
        <p>
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parents: 238
diff changeset
   877
          The <dfn id="dom-networkservice-type"><code>type</code></dfn> attribute reflects the value of the <a>valid
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parents: 238
diff changeset
   878
          service type</a> of the service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   879
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   880
        <p>
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parents: 238
diff changeset
   881
          The <dfn id="dom-networkservice-url"><code>url</code></dfn> attribute is an <a href=
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parents: 238
diff changeset
   882
          "http://www.w3.org/TR/html5/urls.html#absolute-url"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   883
             class="externalDFN">absolute URL</a> pointing to the root HTTP endpoint for the service that has been
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   884
             added to the <a>entry script origin's URL whitelist</a>. Web pages can subsequently use this value for
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   885
             implicit cross-document messaging via various existing mechanisms (e.g. Web Sockets, Server-Sent Events,
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   886
             Web Messaging, XMLHttpRequest).
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   887
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   888
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   889
          The <dfn id="dom-networkservice-config"><code>config</code></dfn> attribute provides the raw configuration
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   890
          information extracted from the given network service.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   891
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   892
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   893
      <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   894
        <h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   895
          States
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   896
        </h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   897
        <dl class="domintro">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   898
          <dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   899
            <var title="">service</var> . <code title="dom-networkservice-online"><a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   900
            "#dom-networkservice-online">online</a></code>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   901
          </dt>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   902
          <dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   903
            <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   904
              Returns <code>true</code> if the service is reporting that it is accessible on the local network or
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   905
              <code>false</code> if the service is reporting that it is no longer accessible (temporarily or
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parents: 238
diff changeset
   906
              permanently) on the local network.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   907
            </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   908
          </dd>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   909
        </dl>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   910
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   911
          The <dfn id="dom-networkservice-online"><code>online</code></dfn> attribute indicates whether the service is
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   912
          reporting itself as being either <var>online</var>, and therefore accessible on the local network, in which
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   913
          case this attribute will return <code>true</code> or, <var>offline</var>, and therefore not accessible on the
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   914
          local network, either temporarily or permanently, in which case this attribute will return
240
4bb39c70f008 Minor editorial updates
Rich Tibbett <richt@opera.com>
parents: 239
diff changeset
   915
          <code>false</code>. This attribute MUST default to <code>true</code>.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
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parents: 238
diff changeset
   916
        </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   917
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   918
      <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   919
        <h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   920
          Events
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   921
        </h3>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   922
        <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   923
          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
   924
          "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
   925
          "#networkservice"><code>NetworkService</code></a> interface:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   926
        </p>
243
220f3226b2a1 Apply pub rules to proposed Working Draft update
Rich Tibbett <richt@opera.com>
parents: 241
diff changeset
   927
        <table border="1">
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   928
          <thead>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   929
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   930
              <th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   931
                <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
   932
              </th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   933
              <th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   934
                <span>Event handler event type</span>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   935
              </th>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   936
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   937
          </thead>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   938
          <tbody>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   939
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   940
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   941
                <dfn id="dom-networkservice-onnotify"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   942
                    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
   943
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   944
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   945
                <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
   946
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   947
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   948
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   949
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   950
                <dfn id="dom-networkservice-onserviceonline"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   951
                    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
   952
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   953
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   954
                <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
   955
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   956
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   957
            <tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   958
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   959
                <dfn id="dom-networkservice-onserviceoffline"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   960
                    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
   961
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   962
              <td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   963
                <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
   964
              </td>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   965
            </tr>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   966
          </tbody>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   967
        </table>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   968
      </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   969
    </section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   970
    <section>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   971
      <h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   972
        Service Discovery
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   973
      </h2>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   974
      <p>
243
220f3226b2a1 Apply pub rules to proposed Working Draft update
Rich Tibbett <richt@opera.com>
parents: 241
diff changeset
   975
        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
   976
        "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
   977
        <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
   978
        "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
   979
        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
   980
        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
   981
        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
   982
        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
   983
        specification.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   984
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   985
      <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
   986
        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
   987
        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
   988
        any resulting <a href="#networkservice"><code>NetworkService</code></a> objects.
239
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parents: 238
diff changeset
   989
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   990
      <p>
250
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diff changeset
   991
        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
   992
        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
   993
        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
   994
        continuously monitoring the network as a background process or on invocation of this API from a Web page).
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   995
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   996
      <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
   997
        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
   998
        that is used to track all the services that have been discovered and are available in the current network at
372
7639401e21f4 Allow SSDP service discovery request to issue an ST header equal to 'ssdp:all', 'upnp:rootdevice' or urn:schemas-upnp-org:service:serviceType:ver
Rich Tibbett <richt@opera.com>
parents: 371
diff changeset
   999
        the current time. At any point during the running of either of the two <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
  1000
        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
  1001
        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
  1002
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1003
      <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
  1004
        The <dfn>list of active service managers</dfn> is an internal list within user agents that is used to track all
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
  1005
        <a href="#networkservices"><code>NetworkServices</code></a> objects currently being shared with any web pages
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
  1006
        at the current time within the user agent. Each <a href="#networkservices"><code>NetworkServices</code></a>
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
  1007
        object in the <a>list of active service managers</a> represents a collection of zero or more <a href=
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
  1008
        "#networkservice"><code>NetworkService</code></a> objects - known as its <dfn>indexed properties</dfn>.
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
  1009
        <a href="#networkservice"><code>NetworkService</code></a> objects are attached as the <a>indexed properties</a>
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
  1010
        of a <a href="#networkservices"><code>NetworkServices</code></a> object as part of the <a href=
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1011
        "#dom-navigator-getnetworkservices"><code>getNetworkServices()</code></a> algorithm.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1012
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1013
      <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1014
        The rule for <dfn>adding an available service</dfn> is the process of adding a new service or updating an
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
  1015
        existing service that is generally available on the user's current network in the <a>list of available service
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
  1016
        records</a>. This rule takes one argument, <var>network service record</var>, and consists of running the
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1017
        following steps:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1018
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1019
      <ol class="rule">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1020
        <li>For each <var>existing service record</var> in the current <a>list of available service records</a>, run
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1021
        the following sub-steps:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1022
          <ol class="rule">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1023
            <li>If the <var>existing service record</var>'s <code>id</code> property does not equal <var>network
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1024
            service record</var>'s <code>id</code> property then abort any remaining sub-steps and continue at the next
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1025
            available <var>existing service record</var>.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1026
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1027
            <li>Replace the value of <var>existing service record</var> in the current <a>list of available service
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
  1028
            records</a> with the value of <var>network service record</var>, aborting any remaining steps in this
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
  1029
            algorithm and return.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1030
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1031
          </ol>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1032
        </li>
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
  1033
        <li>Add <var>network service record</var> to the <a>list of available service records</a> as a new item.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1034
        </li>
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
  1035
        <li>For each <var>service manager</var> in the <a>list of active service managers</a> run the following steps:
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1036
          <ol class="rule">
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
  1037
            <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
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1038
              <ol class="rule">
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
  1039
                <li>If the <var>network service record</var>'s <code>id</code> property equals the <var>active
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
  1040
                service</var>'s <code>id</code> attribute then set <var>active service</var>'s <a href=
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
  1041
                "#dom-networkservice-online"><code>online</code></a> attribute to <code>true</code> and then <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
  1042
                "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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
  1043
                      class="externalDFN">queue a task</a> to dispatch a newly created event with the name <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
  1044
                      "#event-serviceonline"><code>serviceonline</code></a> that uses 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
  1045
                      "http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#event"
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
  1046
                      class="externalDFN"><code>Event</code></a> interface, which does not bubble, is not cancellable,
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
  1047
                      and has no default action, at the current <var>active service</var> object.
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
  1048
                </li>
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
  1049
              </ol>
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
  1050
            </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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1051
            <li>Let <var>'service type in current service manager' flag</var> be <code>false</code>.
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1052
            </li>
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1053
            <li>For each <var>requested control type</var> of the <var>requested control types</var> in <var>service
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1054
            manager</var> run the following steps:
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1055
              <ol class="rule">
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1056
                <li>If <var>network service record</var>'s <code>type</code> property does not equal <var>requested
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1057
                control type</var> then abort any remaining sub-steps and continue at the next available <var>requested
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1058
                control type</var>.
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1059
                </li>
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1060
                <li>Set the <var>'service type in current service manager' flag</var> to <code>true</code>, abort any
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1061
                remaining sub-steps and continue.
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1062
                </li>
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1063
              </ol>
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1064
            </li>
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
  1065
            <li>If the <var>'service type in current service manager' flag</var> is set to <code>true</code> then
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
  1066
            increment <var>service manager</var>'s <a href=
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
  1067
            "#dom-networkservices-servicesavailable"><code>servicesAvailable</code></a> attribute by <code>1</code> and
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
  1068
            then <a href="http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1069
                  class="externalDFN">queue a task</a> to dispatch a newly created event with the name <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1070
                  "#event-serviceavailable"><code>serviceavailable</code></a> that uses the <a href=
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1071
                  "http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#event"
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1072
                  class="externalDFN"><code>Event</code></a> interface, which does not bubble, is not cancellable, and
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
  1073
                  has no default action, at the current <var>service manager</var> object.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1074
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1075
          </ol>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1076
        </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1077
      </ol>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1078
      <p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1079
        The rule for <dfn>removing an available service</dfn> is the general process of removing a service from the
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1080
        <a>list of available service records</a> that has left the user's current network or has otherwise expired.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1081
        This rule takes one argument, <var>service identifier</var>, and consists of running the following steps:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1082
      </p>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1083
      <ol class="rule">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1084
        <li>For each <var>existing service record</var> in the current <a>list of available service records</a>, run
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1085
        the following sub-steps:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1086
          <ol class="rule">
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1087
            <li>If the <var>existing service record</var>'s <code>id</code> property does not match <var>service
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1088
            identifier</var> then skip any remaining sub-steps for the current <var>existing service record</var> and
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1089
            continue at the next available <var>existing service record</var>.
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1090
            </li>
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1091
            <li>If the <var>existing service record</var>'s <code>type</code> property begins with the DOMString
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1092
            "<code>upnp:</code>" and <var>existing service record</var>'s <code>eventsURL</code> property is set then
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1093
            run the rule to <a>terminate an existing UPnP Events Subscription</a>, if one is currently active (as a
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1094
            result of having previously called <a>setup a UPnP Events Subscription</a> against the current
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1095
            <var>existing service record</var>).
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1096
            </li>
250
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parents: 243
diff changeset
  1097
            <li>For each <var>service manager</var> in the <a>list of active service managers</a> run the following
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1098
            steps:
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1099
              <ol class="rule">
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
  1100
                <li>Let <var>'service type in current service manager' flag</var> be <code>false</code>.
239
7e34654692fc HTML5 Tidy on Network Service Discovery spec markup
Rich Tibbett <richt@opera.com>
parents: 238
diff changeset
  1101
                </li>
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
  1102
                <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
Rich Tibbett <richt@opera.com>
parents: 243
diff changeset
  1103
                  <ol class="rule">
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
  1104
                    <li>If <var>existing service record</var>'s <code>id</code> property equals the <var>active
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
  1105
                    service</var>'s <code>id</code> attribute and <var>active service</var>'s <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
  1106
                    "#dom-networkservice-online"><code>online</code></a> attribute is currently set to
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
  1107
                    <code>true</code> then set <var>active service</var>'s <a href="#dom-networkservice-online"><code>
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
  1108
                      online</code></a> attribute to <code>false</code> and then <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
  1109
                      "http://www.whatwg.org/specs/web-apps/current-work/complete/webappapis.html#queue-a-task"
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
  1110
                          class="externalDFN">queue a task</a> to dispatch a newly created event with the name <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
  1111
                          "#event-serviceoffline"><code>serviceoffline</code></a> that uses 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
  1112
                          "http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#event"
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
  1113
                          class="externalDFN"><code>Event</code></a> interface, which does not bubble, is not
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
  1114
                          cancellable, and has no default action, at the current <var>active service</var>.
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
  1115
                    </li>
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
  1116
                  </ol>
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
  1117
                </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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1118
                <li>For each <var>requested control type</var> of the <var>requested control types</var> in
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1119
                <var>service manager</var> run the following steps:
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1120
                  <ol class="rule">
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1121
                    <li>If <var>existing service record</var>'s <code>type</code> property does not equal
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1122
                    <var>requested control type</var> then abort any remaining sub-steps and continue at the next
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1123
                    available <var>requested control type</var>.
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1124
                    </li>
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1125
                    <li>Set the <var>'service type in current service manager' flag</var> to <code>true</code>, abort
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1126
                    any remaining sub-steps and continue.
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1127
                    </li>
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1128
                  </ol>
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)
Rich Tibbett <richt@opera.com>
parents: 374
diff changeset
  1129
                </li>
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
  1130
                <li>If the <var>'service type in current service manager' flag</var> is set to <code>true</code> then
250
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parents: 243<