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Re: [scim] Filter ABNF Clarifications

Shelley <randomshelley@gmail.com> Thu, 13 August 2020 17:12 UTC

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From: Shelley <randomshelley@gmail.com>
Date: Thu, 13 Aug 2020 12:12:07 -0500
Message-ID: <CAGUsYPwhLdafN-e1E-SSEdp8SuScYFx0uD_9f4kT9fN3yz-GkQ@mail.gmail.com>
To: Phillip Hunt <phil.hunt@independentid.com>
Cc: scim@ietf.org
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Subject: Re: [scim] Filter ABNF Clarifications
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OK, thanks for the clarification. I think I better understand the intent
behind the "*1" now; this also allows for optional parentheses around any
filter expression. I presume the space should still be allowed between the
"not" and open parenthesis "(", though? The following updated syntax
includes an optional space following the "not", and also includes the
recommended parentheses grouping [1] for clarification:

     FILTER    = attrExp / logExp / valuePath / ( ["not" *1SP] "(" FILTER
")" )

     valFilter = attrExp / logExp / ( ["not" *1SP] "(" valFilter ")" )

[1] https://tools.ietf.org/html/rfc5234#section-3.5


On Thu, Aug 13, 2020 at 11:27 AM Phillip Hunt <phil.hunt@independentid.com>
wrote:

> Shelly
>
> The “not” is itself optional to allow bracketing of sub filter
> expressions.
>
> (Filter) or not(filter)
>
> Phil
>
> On Aug 13, 2020, at 8:56 AM, Shelley <randomshelley@gmail.com> wrote:
>
> 
> While reviewing the SCIM 2.0 filter ABNF syntax [1], I found what appears
> to be a couple of issues that I wanted to confirm before submitting errata.
>
> Regarding the "not" filters:
>
>      FILTER    = attrExp / logExp / valuePath / *1"not" "(" FILTER ")"
>
>      valFilter = attrExp / logExp / *1"not" "(" valFilter ")"
>
> Specifically, if I'm not mistaken:
>
>    - there should be a space between "not" and "("
>       - alternatively, the following example [2] *should not *include a
>       space:
>       not (emails co "example.com" or emails.value co "example.org")
>    - the use of "*1" is not correct
>       - this effectively makes the entire rule optional
>
> As such, I think the above filters should be re-written as:
>
>      FILTER    = attrExp / logExp / valuePath / "not" [SP] "(" FILTER ")"
>
>      valFilter = attrExp / logExp / "not" [SP] "(" valFilter ")"
>
> In case any SCIM clients/providers are relying on the existing ABNF which
> does not define the space, the above syntax makes the space optional.
>
> Please confirm whether I've misinterpreted anything, otherwise, I will
> likely report this as errata.
>
> [1] https://tools.ietf.org/html/rfc7644#page-21
> [2] https://tools.ietf.org/html/rfc7644#page-23
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