Captcha Helper/Library

[Shadowhand]

We need to create (or port) a captcha plugin. I think we can make something really good.

Some helpful links:

• Creating gradients with GD
• Another gradient example
• Creating captchas with PHP
• Audio and Visual captcha images

Ideally, I'd like to see these features:

• Storage of the captcha with the filename as the captcha phrase (eg: captcha text is "DFRN", filename is "DFRN.jpg") to eliminate the need for the database
• Expiration, based on date the captcha was created (12-36 hours?), configurable
• Dynamic selection of the captcha to be displayed, storage of the current captcha in $_SESSION
• Allow both random text and (configurable) word selection
• Use GD2 exclusively (imagecreatetruecolor > imagecreate)

[flickerfly]

It would be nice to have the option of using reCaptcha. http://recaptcha.net/

In addition, we'd help out the digitizing of books. :-)

[zombor]

Shouldn't this be part of the validation library?

[forngren]

This project uses a clever approach, instead of relying in images/sound, it asks the user a simple question. This has huge usability benefits and can be used visually challenged as well as mobile users.

http://drupal.org/project/riddler

[Shadowhand]

This feature depends on #156.

[Lick]

Storing as #captcha_text#.jpg would defeat the purpose of having a captcha system!

ReCAPTCHA requires registration, but is really nice. I had made a Library for CakePHP for it before, it's not that hard to implement it in Application though. Most of the code will be in the vendor's file.

[Shadowhand]

Moving to 2.2, there's too much work left to get this into 2.1.

[OscarB]

Initial version in r2195 Working but not polished yet.

[Geert]

More improvements in r3015. Switched to a driver based structure which allows for great flexibility in the type of Captcha's that can be generated.

[Geert]

Closing this ticket. Over the past few days, a lot of work has gone into a rebuilt Captcha library.

• We've got a flexible driver-based structure allowing you to build your own Captcha challenges.
• We've got the power to easily switch Captcha styles (~drivers) via config groups.
• We've got prebuilt drivers for both random text and language-specific word selection, for riddles and math.
• We've got gradients in GD2. Yay!
• We've got a simple yet effective counter and promotion system which in my opinion is even better than going the caching route.

What more do you want?