Re: [Mediawiki-l] about captcha.py image generator

-- rik On Wed, February 8, 2006 08:44, FxParlant wrote: > Don't expect too much from a guide for dummies made by a dummy. > For windows. > > About the captcha.py generator. > > TABLE OF CONTENT > - what it does ? > - where to find it ? > - how it works ? > - The image generator > - "No module named image" error > - "empty range" error > - credits > > > 1) WHAT IT DOES ? > > The captcha system written by Brion Vibber and published under GNU > licence (unlike most of the captcha system to be found in php on the net > which are copyrighted) doesn't build the captcha images on the fly. > Instead, you have to produce a bunch of images. > > The generator take a word in a wordlist. > Creates an image with the word on it. > It encrypts the word using a key. > Stores the image in a directory, with the encrypted as filename (png > image) > > > 2)WHERE TO FIND IT ? > > in the ConfirmEdit extension: > > http://cvs.sourceforge.net/viewcvs.py/wikipedia/extensions/ConfirmEdit/ > (for the html access) > > http://www.mediawiki.org/wiki/Download_from_CVS > (for indications on the cvs access, I intend to create a tutorial on > using CVS with Eclipse) > > Download the three files: > ConfirmEdit.php > FancyCaptcha.php > captcha.py > > > 3)HOW IT WORKS ? > (only as much as I understand) > > Apart from the explanations provided in the php files itself, you can > find some indications in the post from Brion: > http://article.gmane.org/gmane.org.wikimedia.mediawiki/10179/match=fancycapt... > > Mainly, you have to fill some of the variables in the fancycaptha.php > file, with : > > $wgCaptchaClass = 'SimpleCaptcha' > becomes > $wgCaptchaClass = 'FancyCaptcha'; > > $wgCaptchaDirectory the directory where the images are stored at your > webhost (NO EXAMPLE yet) > > $wgCaptchaSecret by the key used to encrypt the words of your list > ex: > $wgCaptchaSecret='turtle'; > > > > 4)THE IMAGE GENERATOR > > The file captcha.py is a file written in python to produce the images, > encrypt them and store them with the encrypted filename. > > As it is written in python, you will need a python interpreter. You > might already have one installed with some Apache-Mysql-php kits. Check > your Apache folder, and your c:\ folder. Search your computer for the > file python.exe > > If not found, download and install a brand new one from: > http://www.python.org/download/ > > You might use this opportunity to get a newer one if yours is too old, > because we will have to add some "plugin" which can't use python > versions prior to 2.1 > > The command line I used is (can be used as .bat): > > c:\python24\python.exe C:\pytest\captcha.py --wordlist C:\pytest\w.txt > --output C:\pytest\ --key turtle --count 10 --fill 2 --font Arial > > Where: > c:\python24\python.exe is the newer interpreter I installed (there is an > older one attached to my apache, and if I just call python.exe on > command line, the old one comes up. To check which one you are using, > type: python -v ) > > C:\pytest\captcha.py is the path to the captcha.py file I downloaded > from the ConfirmEdit extension. As you can notice, to avoid problems > with space in windows paths like "my document", I created a filed called > "pytest" (less than 8 letters) directly at the root of my system. > > --wordlist C:\pytest\w.txt is the path to a text file I created with a > list of words. Each word on a line, which means: I type a word, and I > hit Enter. On my first attempt, I created only five of them. This might > be too short. Use a longer list: 10 to 20 > > --output C:\pytest\ path to the directory I want the images to be > stored. Not sure if the ending \ is necessary. It worked with it. > > --key turtle this is the key used to encrypt the words. It has to be > the same as the $wgCaptchaSecret variable in the fancycaptcha.php file, > otherwise it won't be able to decrypt it. Just use a secret word: be > creative. > > --count 10 really, I haven't got a clue what it is, and how it must be > set up. I tried 3, it didn't work. Hopefully, someone will tell us if > there is a minimum and a max for this > > --fill 2 same as before, no idea what it is for and what the inferior > and superior limits are > > --font Arial At first I didn't use this parameter. I tried this, and > maybe it helped this working... > > > > 5) NO MODULE NAMED IMAGE error > > At first, you might get this error: > > Traceback (most recent call last): > File "C:\pytest\captcha.py", line 26, in ? > import Image > ImportError: No module named Image > > DIAGNOSIS: you don't have the image module, which can be found in a > library for python. > > SOLUTION > Download and install PIL from the middle of this page: > http://www.pythonware.com/products/pil/ > > Beware, you have to choose the PIL corresponding to your version of python > > > 6) EMPTY RANGE error > > After you have installed the PIL, something can again be wrong: > > Traceback (most recent call last): > File "C:\pytest\captcha.py", line 145, in ? > word1 = words[random.randint(0,len(words)-1)] > File "c:\python24\lib\random.py", line 216, in randint > return self.randrange(a, b+1) > File "c:\python24\lib\random.py", line 192, in randrange > raise ValueError, "empty range for randrange() (%d,%d, %d)" % (istart, > , width) > ValueError: empty range for randrange() (0,0, 0) > > > As long as I tried, I believe this is due to an error in the --fill or > --count parameters of the command line. > > And in the end: IT WORKED FOR ME > > image_e920d182_6ea824a00198ed4f.png > image_b18fd5f0_bb1e8e848697c902.png > image_0206469a_889d0b2dab698f4d.png > image_d360bf03_ab8400fd4dfc4b9d.png > image_7ae15d3e_aca3a3ea9d4c36a4.png > image_ccc4294b_e9db09ebf2dd58d7.png > image_b00e56fb_bd1657b6488424dc.png > > 7) CREDITS > > Thank you very much to Brion Vibber for developing extensions for > "advanced dummies" like me, only able of rewarding him by grinning about > having to understand python and finding out by themselves what on earth > the parameters for command line might be. Ingratitude has no depth :-) > > Hope this will help. please do tell me what is missing. Hopefully, there > will soon be a page created in mediawiki for this extension (no search > on meta.mediawiki came up with something like fancycaptha). As soon as > the creator puts it on, I might add this participation to it. Be free to > add what I omitted, and correct where I was wrong or unclear. > > François > > _______________________________________________ > MediaWiki-l mailing list > MediaWiki-l@Wikimedia.org > http://mail.wikipedia.org/mailman/listinfo/mediawiki-l > >