NameError: global name 'captcha' is not defined

[shendric@…]

Using r6876 of trac and spam-filter-captcha I get the following error when a ticket is identified as spam. The error shows itself only after enabling the CaptchaSystem as the reject_handler.

[spam-filter]
...
reject_handler = CaptchaSystem

(Sorry, I'm learning more about Python to help debug stuff, but it's slow. Sorry.)

How to Reproduce

While doing a GET operation on /captcha, Trac issued an internal error.

(please provide additional details here)

User Agent was: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b5) Gecko/2008041514 Firefox/3.0b5

System Information

Trac	0.11dev-r6873
Python	2.4.3 (#2, Oct 6 2006, 08:04:11) [GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)]
setuptools	0.6c8
SQLite	3.2.8
pysqlite	2.0.5
Genshi	0.4.4
mod_python	< 3.2
Subversion	1.3.1 (r19032)
jQuery:	1.2.3

Python Traceback

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6873-py2.4.egg/trac/web/main.py", line 417, in _dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/Trac-0.11dev_r6873-py2.4.egg/trac/web/main.py", line 197, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/lib/python2.4/site-packages/TracSpamFilter-0.2dev_r6876-py2.4.egg/tracspamfilter/captcha/api.py", line 88, in process_request
    captcha['challenge'] = html
NameError: global name 'captcha' is not defined

[Christian Boos]

Ah sorry, the "cleanup" was a bit hasty. Simply use r6874 for now.

[shendric@…]

Just let me know when you'd like me to test a new version :) Thanks!

[Christian Boos]

Fixed in r6881 - please try out r6883 (in sync with the main SpamFilter plugin).

Note that this time I also tested the "Image" handler, which works also quite nicely. Activate it with:

[spam-filter]
...
(your other spam-filter entries)
...
reject_handler = CaptchaSystem
captcha = ImageCaptcha

[anonymous]

Great, this is close. Thanks!

Two things: 1) I am now able to use the non-image handler. However, after resolving the equation, I have to start over with a new ticket. Assuming that the person spent a long time submitting the ticket, it would probably be preferable to submit the ticket that they were trying to fill out the first time.

2) With the ImageCaptcha handler, I get a new error:

Trac detected an internal error: AttributeError: Cannot find an implementation of the "ICaptchaMethod" interface named "ImageCaptcha". Please update the option spam-filter.captcha in trac.ini.

[Christian Boos]

About 1: yes, I agree (I wrote a warning/TODO about this in SpamFilter#AbouttheCaptchavariant) - feel free to open a new ticket if you don't see the feature coming in the next days ;-)

About 2: it's probably because the tracspamfilter.captcha.image module was not loaded, check in your trac.log near the beginning. Common failure causes:

• you haven't enabled the component
• you have no ​PIL installed or it was not installed using setuptools (use easy_install PIL, which should do the job)