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RE: [Policy] identifying APIs

From: Marcin Hanclik <Marcin.Hanclik@access-company.com>
Date: Tue, 6 Oct 2009 23:35:07 +0200
To: John Kemp <john@jkemp.net>, Frederick Hirsch <frederick.hirsch@nokia.com>
CC: W3C Device APIs and Policy WG <public-device-apis@w3.org>
Message-ID: <FAA1D89C5BAF1142A74AF116630A9F2C2890BCA524@OBEEX01.obe.access-company.com>
Hi John,

Would it be possible for you to share [API]?

Why would we need APIs to be resources? (I know it is possible, but ...)
APIs are used to retrieve resources / data / information that may have URI representations.
So we would end up in URIs retrieving URIs retrieving URIs and so on.
I believe the level of detail plays the role here.

We had similar discussion in BONDI a few months ago.

I think we could take WebIDL and try to make URIs from the WebIDL structure as an example.

E.g.
module mod1 {
 interface if1 {
  void f1(in DOMString p1, in unsigned long p2);
  void f2();
  attribute unsigned long a1;
  };
};

Then we could have quite simple URIs:

http://www.w3.org/dap/api/mod1/if1/f1
http://www.w3.org/dap/api/mod1/if1/f2
http://www.w3.org/dap/api/mod1/if1/a1

or

http://www.w3.org/dap/api/mod1/if1.f1
etc.
and we could even invoke such api with parameters and their values:

http://www.w3.org/dap/api/mod1/if1/f1?p1=oo&p2=2

The problems could start if we would have module in module structure [1].
Those could be overcome by some syntaxes if we would need.

As in [2] I just wonder about the goal of such a representation, specifically to express security dependencies that should be compact IMHO.

Thanks,
Marcin

[1] http://www.w3.org/TR/WebIDL/#idl-modules
[2] http://lists.w3.org/Archives/Public/public-device-apis/2009Oct/0064.html
________________________________________
From: public-device-apis-request@w3.org [public-device-apis-request@w3.org] On Behalf Of John Kemp [john@jkemp.net]
Sent: Tuesday, October 06, 2009 7:58 PM
To: Frederick Hirsch
Cc: W3C Device APIs and Policy WG
Subject: Re: [Policy] identifying APIs

Hi Frederick,

Frederick Hirsch wrote:
> Earlier I listed some of the higher level requirements and goals to
> consider for DAP API Policy [1]. One of these was:
> "10. Able to identify an API by URI"
> I should note that URI need not be the only approach, though my
> inclination was to start with URI.
>
> An example of the first approach, using a URI, is BONDI 1.01 which
> defines IRIs for the various APIs (section 4.2 BONDI architecture and
> security [2]).
>
> A second approach is to use class names, as Marcin noted in the Access
> workshop position paper [3]  - APIs could be identified by Javascript
> class name and optional property attribute (see the table in 3.3).
>
> A third approach is to not name APIs at all, but pass material in the
> API invocation to enable use, passing a capability. But for an
> enforcement engine to evaluate declarative policy it  would still need
> to be able to name APIs, I would think.
>
> This raises a couple of questions: is the DAP API work restricted solely
> to Javascript or should the model support other languages (degree of
> language independence needed), and does declarative policy require the
> ability to name an API (regardless of whether feature access control is
> included).
>
> It seems to me we need naming and that URIs offer more flexibility. Is
> this a decision easily made, or is discussion required?

+1 to using URIs to name APIs. As I suggested in an early draft document
I presented to the TAG a couple of weeks ago [API], I think an API can
be thought of as a (set of) resource(s), which have representations.

If you were to expose the same APIs via a device-hosted HTTP server,
what would the URIs look like? Could a URI identify the same resource,
regardless of whether that resource is accessed as a Javascript function
call or via an HTTP access?

Cheers,

- johnk

[API] http://www.w3.org/2001/tag/2009/09/apis-on-the-web.html
(member-restricted, I believe)

>
> regards, Frederick
>
> Frederick Hirsch
> Nokia
>
>
> [1]
> http://lists.w3.org/Archives/Public/public-device-apis/2009Sep/0126.html
>
> [2]
> http://bondi.omtp.org/1.01/security/BONDI_Architecture_and_Security_v1_01.pdf
>
>
> [3]
> http://www.w3.org/2008/security-ws/papers/ACCESSPositionPaper_W3CSecurityWorkshop.pdf
>
>
>



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Received on Tuesday, 6 October 2009 21:35:48 UTC

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