[IPP] "Get-User-Supported-Values" operation?

[IPP] "Get-User-Supported-Values" operation?

[IPP] "Get-User-Supported-Values" operation?

Ira McDonald blueroofmusic at gmail.com
Sat Jan 14 20:51:31 UTC 2017

Hi Mike,

Thanks for those clarifications.

I suggest the proposed new operation be named "Get-User-Printer-Attributes"
to show the authenticated User dependence and the otherwise similarity to
the classic "Get-Printer-Attributes" operation.

I agree that a brief whitepaper is appropriate.

I have strong reservations about adding a new operation (as opposed to some
attributes) simply via IPP WG approval for IANA registration.  We should
more about where this operation might be published.

- Ira

Ira McDonald (Musician / Software Architect)
Co-Chair - TCG Trusted Mobility Solutions WG
Chair - Linux Foundation Open Printing WG
Secretary - IEEE-ISTO Printer Working Group
Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
IETF Designated Expert - IPP & Printer MIB
Blue Roof Music / High North Inc
mailto: blueroofmusic at gmail.com
Jan-April: 579 Park Place  Saline, MI  48176  734-944-0094
May-Dec: PO Box 221  Grand Marais, MI 49839  906-494-2434

On Sat, Jan 14, 2017 at 1:45 PM, Michael Sweet <msweet at apple.com> wrote:

> Ira,
> On Jan 14, 2017, at 11:45 AM, Ira McDonald <blueroofmusic at gmail.com>
> wrote:
> Hi Smith,
> I agree with Mike that this operation should not be added to IPP System
> Service.
> I question the need for this operation.
> An IPP job service implementation can filter a Get-Printer-Attributes
> response already based on authenticated user identity.
> From a practical perspective, Get-Printer-Attributes is never
> authenticated because clients do not support that usage. So no, we can't
> just use Get-Printer-Attributes...
> Right now clients need to use Validate-Job (which *is* authenticated for
> printers that do authentication of print jobs) in order to validate the
> choices a user has made.
> What new functionality would this putative operation add to IPP?
> It would be defined as an authenticated version of Get-Printer-Attributes
> that explicitly filters the values based on the authenticated identity of
> the requestor.
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer
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