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

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

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

Ira McDonald blueroofmusic at gmail.com
Sun Jan 15 15:36:07 UTC 2017


Hi Mike and Smith,

I suggest that the parameters and attributes of such an operation

are exactly the same as Get-Printer-Attributes, except that the User
identity MUST be authenticated and MUST be authorized (via some
out-of-band manner) to perform the new operation.

It might be appropriate to abandon the "limit" and friends and also
to say that you can't read "media-col-database" with this operation.
It might also be appropriate to abandon "requested-attributes" and
just return all the simple attributes and "xxx-supported" attributes.

Smith - please think about the use case(s) and propose by email
some more details for discussion as a next step.

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 Sun, Jan 15, 2017 at 9:08 AM, Michael Sweet <msweet at apple.com> wrote:

> 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
> <(734)%20944-0094>
> May-Dec: PO Box 221  Grand Marais, MI 49839  906-494-2434
> <(906)%20494-2434>
>
>
> 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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