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

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

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

Michael Sweet msweet at apple.com
Sun Jan 15 14:08:36 UTC 2017


Ira,

The registration policy for operations is Expert Review, so a full specification is not technically required. That said, we (the designated experts) and the IPP workgroup can require sufficient clarity in the definition of the operation before such a registration is approved, or to require a spec of the scope of the registration is (in the opinion of the WG or designated experts) too broad for a simple registration.

In the case of this operation, we simply (IMHO) do not have enough information to decide.


Sent from my iPad

> On Jan 14, 2017, at 3:51 PM, Ira McDonald <blueroofmusic at gmail.com> wrote:
> 
> 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 talk
> more about where this operation might be published.
> 
> Cheers,
> - 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
> http://sites.google.com/site/blueroofmusic
> http://sites.google.com/site/highnorthinc
> 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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