FormDiceCaptcha.module

<?php
/**
 * Dice Captcha
 * 
 * @copyright 2015, Roman Seidl
 * Licensed under GNU/GPL v3, see LICENSE.TXT
 *
 */


class FormDiceCaptcha extends WireData implements Module, ConfigurableModule
{
    public static function getModuleInfo()
    {
        return array(
            'title' => 'Dice Captcha',
            'summary' => 'Creates a dice captcha',
            'singular' => true,
            'autoload' => true,
	    'version' => 12
        );
    }
    
    
    protected static $defaultConfigData = array("num_dices" => 3, 'dice_size' => 50);
    
    public function __construct()
    {
        foreach (self::$defaultConfigData as $key => $value) {
            $this->data[$key] = $value;
        }
    }
    
    private $captchadir;
    
    const CAPTCHA_DIR = "captcha/";
    const CAPTCHA_KEY = "dice_captcha";
    
    public function init()
    {
        $this->captchadir = $this->config->paths->assets . self::CAPTCHA_DIR;
        if (!is_dir($this->captchadir)) {
            wireMkdir($this->captchadir);
        } else {
            //delete old files
            $files = glob($this->captchadir . "/*");
            $now   = time();
            foreach ($files as $file)
                if (is_file($file))
                    if ($now - filemtime($file) >= 60 * 2) // 2 Minutes
                        unlink($file);
            
        }
    }
    
    
    public function captcha()
    {
        
        $images = array();
        for ($i = 1; $i <= 6; $i++) {
            $imgfile    = dirname(__FILE__) ."/". $i . ".jpg";
            $images[$i] = imagecreatefromjpeg($imgfile);
        }
        
        $dice_size = $this->data['dice_size'];
        $num_dices = $this->data['num_dices'];
        
        $canvas_image = imagecreatetruecolor($num_dices * $dice_size, $dice_size);
        
        $current_x = 0;
        
        $sum = 0;
        for ($i = 0; $i < $num_dices; $i++) {
            $dice = rand(1, 6);
            
            $sum += $dice;
            
            imagecopy($canvas_image, // destination image
                $images[$dice], // source image
                $current_x, // x co-ordinate of destination
                0, // y co-ordinate of destination
                0, // x co-ordinate of source
                0, // y co-ordinate of source
                $dice_size, // source img width
                $dice_size // source img height
                );
            
            $current_x = $current_x + $dice_size;
        }
        
        $filename = tempnam($this->captchadir, "c");
        unlink($filename);
        $filename .= ".jpg";
        $captcha = imagejpeg($canvas_image, $filename);
        
        imagedestroy($canvas_image);
        for ($i = 1; $i <= 6; $i++) {
            imagedestroy($images[$i]);
        }
        
        $this->session->set(self::CAPTCHA_KEY, $sum);
        
        return $this->config->urls->assets . self::CAPTCHA_DIR . basename($filename);
    }
    
    public function validate($number)
    {
        return $number == $this->session->get(self::CAPTCHA_KEY);
    }
    
    
    public static function getModuleConfigInputfields(array $data)
    {
        
        $modules     = wire('modules');
        $config      = wire('config');
        $inputfields = new InputfieldWrapper();
        
        foreach (self::$defaultConfigData as $key => $value) {
            if (!isset($data[$key]))
                $data[$key] = $value;
        }
        
        $fieldset              = $modules->get('InputfieldFieldset');
        $fieldset->columnWidth = 50;
        $fieldset->label       = __("Global Settings");
        
        $f              = $modules->get('InputfieldText');
        $f->name        = "num_dices";
        $f->label       = __("num_dices");
        $f->description = __("The number of dice shown.");
        $f->value       = $data["num_dices"];
        $fieldset->append($f);
        
        $f              = $modules->get('InputfieldText');
        $f->name        = "dice_size";
        $f->label       = __("dice_size");
        $f->description = __("Dice image size in pixels. Dice must must be square images.");
        $f->value       = $data["dice_size"];
        $fieldset->append($f);
        
        $inputfields->append($fieldset);
        return $inputfields;
    }
}