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Re: Networked Service Discovery and Messaging - first draft published

From: Harald Alvestrand <harald@alvestrand.no>
Date: Fri, 03 Aug 2012 09:38:12 -0700
Message-ID: <501BFE74.4050105@alvestrand.no>
To: public-device-apis@w3.org
Just because I can't find it in the draft:

What's the security considerations of this document, and where are they 
In particular, are there any security implications of letting JavaScript 
applications run mDNS or uPNP queries on the browser's local network, 
and are there elements of the network topology information that should 
be considered sensitive?


On 08/03/2012 05:33 AM, Rich Tibbett wrote:
> We've just published a first draft of the 'Networked Service Discovery 
> and Messaging' specification to the W3 Mercurial repository. Firstly, 
> thank you to everyone who has helped us get to this point - AKA, the 
> starting line.
> It is the result of collaboration between Opera Software, members of 
> the CableLabs initiative and the W3C Web & TV Interest Group over the 
> past year. At the current time of writing there are currently 3 
> implementations (and counting) based on early drafts of this proposal: 
> a Webkit prototype implementation, an Opera prototype implementation 
> and a Chrome Extension-based implementation.
> The latest draft of this spec is available @
> http://w3c-test.org/dap/discovery-api/
> This API represents a minimal viable framework for discovering, 
> requesting and creating connections with HTTP-based services running 
> on local devices that are advertised in the user's current local 
> network via one or more common discovery protocols (e.g. SSDP and 
> Once a user has authorized access to any specific service(s) then they 
> are able to communicate with those services via a service's advertised 
> control url endpoint (exposed at service.url). The spec describes how 
> this URL is whitelisted in a 'reverse-CORS' way on user authorization 
> to temporarily allow cross-origin communication to happen from the 
> current web page to that service via existing web APIs such as XHR or 
> Web Sockets.
> A number of use cases have been documented in the specification. The 
> use cases generally under consideration revolve around scenarios such 
> as being able to interact and control a wide-range of devices in the 
> home (TVs, Music Players, Home Automation Systems, etc), share media 
> and other content between home devices and enable web application 
> developers to implement second screen experiences for their users 
> directly in web browsers via standard web technologies.
> We would like to shortly make a start on producing a comprehensive 
> conformance test suite to evaluate existing and future implementations 
> against this specification. To this end we would like to issue a CfC 
> to publish a First Public Working Draft of this specification. I 
> believe this is what was agreed to at this groups most recent F2F 
> meeting. The chairs will be issuing a CfC for this specification in 
> the coming weeks.
> It is now open season on discussion of this spec on this mailing list. 
> We would really like input from both implementers and end-users alike 
> at this point. I know a number of people had comments they wanted to 
> share here and now would be a great time to do that.
> Best regards,
Received on Friday, 3 August 2012 16:38:39 UTC

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