Extension:Asirra

Asirra extension is based on Extension:ConfirmEdit by Brion Vibber which provides various CAPTCHA tools for MediaWiki for protection against spambots and other automated tools.

The Asirra service is powered by Microsoft. Users have to distinguish cat images from dog images, a task which is easy for humans but difficult for bots.

Try it!
If you want to see it in action, try adding some to URLs to the Test Page at cedegawiki.net. I had several people replacing the contents of various other pages with nonsense. Please be aware that you destroy something by doing so, and it is considered vandalism, even if you do it to test Asirra!

Installation
The ConfirmEdit extension requires MediaWiki 1.11.0 or higher and PHP5, and so does it's Asirra module.


 * Download the latest version and save it to your computer
 * Unzip all files to the extensions/ConfirmEdit/ folder
 * Edit LocalSettings.php in the root of your MediaWiki installation, and add the following line near the bottom:

Configuration parameters (optional)

 * $wgAsirraEnlargedPosition: [str] Can be one of top, bottom, left, rigth. Defaults to bottom.


 * $wgAsirraCellsPerRow</tt>: [int] Number of images per row. Defaults to 6</tt>.


 * $wgAsirraScriptPath</tt>: [str] If your extensions directory is outside the document root, or not accessible for any reason, you can set an alternative path to Asirra plugin's JavaScripts here.

For other configuration options and user rights, please refer to Extension:ConfirmEdit.

Changelog

 * 0.3: Fixed a bug that kept users from registering new accounts
 * 0.4: Major improvements to JavaScript
 * 0.5: Fixed "Undefined property" notice in Asirra.class.php on line 30
 * 0.6: Fixed a bug which resultet in incorrect JavaScript paths on certain webservers. Added a configuration option to override this path.

Known bugs

 * Actually None