Re: [naviserver-devel] Towards NaviServer 4.99.24

[Gustaf N. <ne...@wu...>]

Hi Dave, Maybe i find time slots before the release for easing this 
process, e.g.m providing a flag for providing a charset for "ns_getform" 
in case it fails,  "ns_urldecode" has already a "-charset" flag) but i 
have not checked the details how complex this is.

all the best -g

On 13.05.22 10:32, David Osborne wrote:
> Thanks Gustaf,
>
> I didn't pick up that your latest commit makes it possible to catch 
> and handle an encoding error now.
> Thanks - we'll try to address the issue that way.
> Regards,
> Dave
>
> On Thu, 12 May 2022 at 12:27, Gustaf Neumann <ne...@wu...> wrote:
>
>     Dear David,
>
>     NaviServer is less strict than the W3C-document, since it does not
>     send automatically an error back.
>     Such invalid characters can show up during decode operations of
>     ns_urldecode and ns_getform.
>     So, a custom application can catch exceptions and try alternative
>     encodings if necessary.
>
>     Since there is currently a large refactoring concerning Unicode
>     handling going on for
>     the Tcl community (with potentially different handling in Tcl 8.6,
>     8.7 and 9.0, ... hopefully
>     there will be full support for Unicode already in Tcl 8.7, the
>     voting is happening right now)
>     it is not a good idea to come up with a special handling by
>     NaviServer. These byte sequences
>     have to be processed sooner or later by Tcl in various versions...
>
>     I do not think it is a good idea to swallow incorrect incoming
>     data by transforming this
>     on the fly, this will cause sooner or later user concerns (e.g.
>     "why is this funny character
>     in the user name", ...) When the legacy application sends e.g.
>     iso8859 encoded data, then it
>     should set the appropriate charset, and it will be properly
>     converted by NaviServer.
>
>     If for whatever reason this is not feasible to get a proper
>     charset, then the NaviServer
>     approach allows to make a second attempt of decoding the data with
>     a different charset.
>
>     all the best
>
>     -gn
>
>
>
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-- 
Univ.Prof. Dr. Gustaf Neumann
Head of the Institute of Information Systems and New Media
of Vienna University of Economics and Business
Program Director of MSc "Information Systems"