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 <neum...@wu.ac.at> 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"
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