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<?php namespace Sayakb\Captcha;
use Config, Str, Session, Hash, URL;
/**
* Laravel 4.1 Captcha package
*
* @copyright Copyright (c) 2013 MeWebStudio
* @copyright Copyright (c) 2013 Sayak Banerjee
* @version 1.0.1
*
* @author Muharrem ERİN
* @contact me@mewebstudio.com
* @link http://www.mewebstudio.com
*
* @author Sayak Banerjee
* @contact mail@sayakbanerjee.com
* @link http://www.sayakbanerjee.com
*
* @date 2013-12-16
* @license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
class Captcha {
/**
* @var Captcha singleton instance of the Useragent object
*/
protected static $singleton;
/**
* @var Captcha config instance of the Captcha::$config object
*/
public static $config = array();
private static $id;
private static $assets;
private static $fonts = array();
private static $backgrounds = array();
private static $char;
public static function instance()
{
if ( ! Captcha::$singleton)
{
self::$config = Config::get('captcha::config');
self::$assets = __DIR__ . '/../../../public/assets/';
self::$fonts = self::assets('fonts');
self::$backgrounds = self::assets('backgrounds');
Captcha::$singleton = new Captcha();
}
return Captcha::$singleton;
}
/**
* Generates a captcha image, writing it to the output
* It is used internally by this bundle when pointing to "/captcha" (see [vendor]\routes.php)
* Typically, you won't use this function, but use the above img() function instead
*
* @access public
* @return img
*/
public static function create($id = null)
{
static::$char = Str::random(static::$config['length'], static::$config['type']);
static::$id = $id ? $id : static::$config['id'];
Session::put('captchaHash', Hash::make(static::$config['sensitive'] === true ? static::$char : Str::lower(static::$char)));
$bg_image = static::asset('backgrounds');
$bg_image_info = getimagesize($bg_image);
if ($bg_image_info['mime'] == 'image/jpg' || $bg_image_info['mime'] == 'image/jpeg')
{
$old_image = imagecreatefromjpeg($bg_image);
}
elseif ($bg_image_info['mime'] == 'image/gif')
{
$old_image = imagecreatefromgif($bg_image);
}
elseif ($bg_image_info['mime'] == 'image/png')
{
$old_image = imagecreatefrompng($bg_image);
}
$new_image = imagecreatetruecolor(static::$config['width'], static::$config['height']);
$bg = imagecolorallocate($new_image, 255, 255, 255);
imagefill($new_image, 0, 0, $bg);
imagecopyresampled($new_image, $old_image, 0, 0, 0, 0, static::$config['width'], static::$config['height'], $bg_image_info[0], $bg_image_info[1]);
$bg = imagecolorallocate($new_image, 255, 255, 255);
for ($i = 0; $i < strlen(static::$char); $i++)
{
$color_cols = explode(',', static::asset('colors'));
$fg = imagecolorallocate($new_image, trim($color_cols[0]), trim($color_cols[1]), trim($color_cols[2]));
imagettftext($new_image, static::asset('fontsizes'), rand(-10, 15), 10 + ($i * static::$config['space']), rand(static::$config['height'] - 10, static::$config['height'] - 5), $fg, static::asset('fonts'), static::$char[$i]);
}
imagealphablending($new_image, false);
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate');
header('Pragma: no-cache');
header("Content-type: image/jpg");
header('Content-Disposition: inline; filename=' . static::$id . '.jpg');
imagejpeg($new_image, null, 80);
imagedestroy($new_image);
}
/**
* Fonts
*
* @access public
* @param string
* @return array
*/
public static function assets($type = null)
{
$files = array();
if ($type == 'fonts')
{
$ext = 'ttf';
}
elseif ($type == 'backgrounds')
{
$ext = 'png';
}
if ($type)
{
foreach (glob(static::$assets . $type . '/*.' . $ext) as $filename)
{
$files[] = $filename;
}
}
return $files;
}
/**
* Select asset
*
* @access public
* @param string
* @return string
*/
public static function asset($type = null)
{
$file = null;
if ($type == 'fonts')
{
$file = static::$fonts[rand(0, count(static::$fonts) - 1)];
}
else if ($type == 'backgrounds')
{
$file = static::$backgrounds[rand(0, count(static::$backgrounds) - 1)];
}
else if ($type == 'fontsizes')
{
$file = static::$config['fontsizes'][rand(0, count(static::$config['fontsizes']) - 1)];
}
else if ($type == 'colors')
{
$file = static::$config['colors'][rand(0, count(static::$config['colors']) - 1)];
}
return $file;
}
/**
* Checks if the supplied captcha test value matches the stored one
*
* @param string $value
* @access public
* @return bool
*/
public static function check($value)
{
$captchaHash = Session::get('captchaHash');
return $value != NULL AND $captchaHash != NULL AND Hash::check(static::$config['sensitive'] === TRUE ? $value : Str::lower($value), $captchaHash);
}
/**
* Returns an URL to the captcha image
* For example, you can use in your view something like
* <img src="<?php echo Captcha::img(); ?>" alt="" />
*
* @access public
* @return string
*/
public static function img()
{
return URL::to('captcha?' . mt_rand(100000, 999999));
}
}
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