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Package captchalot
Short Description Captcha image generator/validator RESTful web service
License MIT
Homepage https://github.com/elcodedocle/captchalot
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Informations about the package captchalot
Captchalot
A dictionary/symbol based captcha generator and validator RESTful service
Copyright (C) 2014 Gael Abadin
License: MIT Expat
Motivation
I wanted to implement a simple, easy to use, scalable and independent RESTful captcha service on my web app.
Requirements
- PHP >= 5.3 with PDO support
- MySQL / MariaDB, Postgres; or a PDO supported DB
Deployment
-
You can install and deploy captchalot using composer:
-
You need to edit
config.php.distin order to provide basic database connection parameters; then save it asconfig.php. -
Here is a basic client written in javascript to AJAX request/refresh/validate a captcha:
-
And here is the server-side PHP controller for this client:
- Check the code (or generate the docs using phpdocumentor) if you want more info on tweaks and supported config/input parameters and values.
Web app
You can test the code above on the provided web app (validate.php, captchalot.js and index.php) you can test
by giving those files public execution/access permissions on your web server, then pointing your browser to index.php
Here is the demo: https://synapp.info/tools/captchalot
Service pitfalls
The web app was designed in the simplest possible way for embedding on a couple of quite low load services that very seldom require captcha actions. That means it wasn't designed with efficiency or performance in mind, although scalability was considered (if your server starts to choke just move the captcha service to AWS or something like that and start throwing on-demand instances at the problem ;-)).
Also, it doesn't implement accessibility features such as an audio reader for blind or short sighted people (sorry :-()
Acks
Some anonymous internet citizen for posting a blog entry years ago (which I wasn't able to find back) showing how to use imagepng for creating an image and drawing lines and adding text to it Peter Norvig, publisher of the compilation of the 1/3 million most frequent English words on the natural language corpus data from where the word list used by the default dictionary source for this project has been derived.
And that's all for now, folks. If you like this project, feel free to buy me a beer ;-)
bitcoin: 1G4d1Ak4aRXqN8SFqiiiGMFSaffxFbu5EX
dogecoin: D8axrRWBZA686kEey1rCXXXamjGg9f6A6s
paypal: http://goo.gl/Q2kRFG
Have fun.-
All versions of captchalot with dependencies
elcodedocle/uuid Version >=2.0.0
elcodedocle/cryptosecureprng Version 0.2.2
ext-gd Version *
ext-pdo Version *