i wrote a captcha system in python using the turbogears framework and
the python imaging library
it basically just creates an image/validation scheme based on a few
variables that is passed into the object -> site secret , user seed ,
expiry time built into a key generator
it's also with a clustered behavior - images are never saved to disk,
they're always rendered on-the-fly.
if you want one-time use captchas, you'd have to 'clear' them through
a db beforehand -- otherwise no db is really necessary
its designed so that the 'image' is a subclass of the captcha --
other subclasses can be audio or text formulas "type the second word
in this sentence" "type out four minus three" etc. simpler put: the
main captcha class handles actually creating captchas and validating
user input , and its up to the user to choose how to display it
( which is different than most of the captcha systems out there that
go for an image then backtrack to creating other formats )
i'm currently migrating it fully into modperl using imager... it
would be very much like GD::SecurityImage, but use imager ( i don't
want to have GD compilied in) and i need some open standards /hooks
on how it creates/validates a captcha, so the same thing can work
with python and php
i'm about 2/3 of the way through porting this... however when its
done its going to be very much tailored to my style of coding, and my
framework, and use conventions that would make some cringe.
i'd like to make this cpanable so other modperlers can use it - would
anyone on the list be interested in collaborating with me, and help
make it more standardized and cpanable? i don't have the time/energy
to do that myself.
i'd also like to make this as optimized as possible since there's a
lot of image generation etc - which means if some processing can be
saved by using some mp only things over perl conventions -- so be it.
fwiw, the python version and some samples is here:
http://dev.2xlp.com/trac/browser/another_python_captcha/trunk
if anyone is interested, please contact me offlist -- thanks.
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