/htdocs/system/application/plugins/dx_captcha_pi.php

<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 4.3.2 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2006, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */



// ------------------------------------------------------------------------



/*

Instructions:



Load the plugin using:



 	$this->load->plugin('captcha');



Once loaded you can generate a captcha like this:



	$vals = array(

					'word'		 => 'Random word',

					'img_path'	 => './captcha/',

					'img_url'	 => 'http://www.your-site.com/captcha/',

					'font_path'	 => './system/texb.ttf',

					'img_width'	 => rand(500, 600),

					'img_height' => rand(80, 120),

					'expiration' => 7200

				);



	$cap = create_captcha($vals);

	echo $cap['image'];





NOTES:



	The captcha function requires the GD image library.



	Only the img_path and img_url are required.



	If a "word" is not supplied, the function will generate a random

	ASCII string.  You might put together your own word library that

	you can draw randomly from.



	If you do not specify a path to a TRUE TYPE font, the native ugly GD

	font will be used.



	The "captcha" folder must be writable (666, or 777)



	The "expiration" (in seconds) signifies how long an image will

	remain in the captcha folder before it will be deleted.  The default

	is two hours.



RETURNED DATA



The create_captcha() function returns an associative array with this data:



  [array]

  (

	'image' => IMAGE TAG

	'time'	=> TIMESTAMP (in microtime)

	'word'	=> CAPTCHA WORD

  )



The "image" is the actual image tag:

<img src="http://your-site.com/captcha/12345.jpg" width="140" height="50" />



The "time" is the micro timestamp used as the image name without the file

extension.  It will be a number like this:  1139612155.3422



The "word" is the word that appears in the captcha image, which if not

supplied to the function, will be a random string.







/**

|==========================================================

| Create Captcha

|==========================================================

|

*/

function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '')

{

	/**

	  * Function to create a random color

	  * Note: We aren't using this outside this function so we will sit it inside

	  * @auteur mastercode.nl

	  * @param $type string Mode for the color

	  * @return int

	  **/

	function color($type)

	{

		switch($type)

		{

			case "bg":

				$color = rand(253,255);

			break;

			case "text":

				$color = rand(0,23);

			break;

			case "grid":

				$color = rand(0,55);

			break;

			default:

				$color = rand(180,200);

			break;

		}

		return $color;

	}



	$defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_size' => '', 'font_path' => '', 'show_grid' => true, 'skew' => true, 'expiration' => 7200);



	foreach ($defaults as $key => $val)

	{

		if ( ! is_array($data))

		{

			if ( ! isset($$key) OR $$key == '')

			{

				$$key = $val;

			}

		}

		else

		{

			$$key = ( ! isset($data[$key])) ? $val : $data[$key];

		}

	}



	if ($img_path == '' OR $img_url == '')

	{

		return FALSE;

	}



	if ( ! @is_dir($img_path))

	{

		return FALSE;

	}



	if ( ! is_really_writable($img_path))

	{

		return FALSE;

	}



	if ( ! extension_loaded('gd'))

	{

		return FALSE;

	}



	// -----------------------------------

	// Select random Font from folder

	// -----------------------------------



	if ( is_dir($font_path) )

	{

		$handle = opendir($font_path);



		while(($file = @readdir($handle)) !== false)

		{

			if(!in_array($file,array('.','..')) && substr($file, strlen($file)-4, 4) == '.ttf' )

			{

				$fonts[] = $file;

			}

		}



		$font_file = $font_path. DIRECTORY_SEPARATOR .$fonts[array_rand($fonts)];

	}

	else

	{

		$font_file = $font_path;

	}



	// -----------------------------------

	// Remove old images

	// -----------------------------------



	list($usec, $sec) = explode(" ", microtime());

	$now = ((float)$usec + (float)$sec);



	$current_dir = @opendir($img_path);



	while($filename = @readdir($current_dir))

	{

		if ($filename != "." and $filename != ".." and $filename != "index.html")

		{

			$name = str_replace(".png", "", $filename);



			if (($name + $expiration) < $now)

			{

				@unlink($img_path.$filename);

			}

		}

	}



	@closedir($current_dir);



	// -----------------------------------

	// Do we have a "word" yet?

	// -----------------------------------



   if ($word == '')

   {

		// No Zero (for user clarity);

		$pool = '23456789abcdefghikmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ';



		$str = '';

		for ($i = 0; $i < rand(6, 8); $i++)

		{

			$str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);

		}



		$word = strtoupper($str);

   }



	// -----------------------------------

	// Length of Word

	// -----------------------------------



	$length	= strlen($word);



	// -----------------------------------

	// Create image

	// -----------------------------------



	$im = ImageCreateTruecolor($img_width, $img_height);



	// -----------------------------------

	//  Assign colors

	// -----------------------------------



	$bg_color		= imagecolorallocate ($im, color('bg'), color('bg'), color('bg'));

	$border_color	= imagecolorallocate ($im, 255, 255, 255);

	$text_color		= imagecolorallocate ($im, color('text'), color('text'), color('text'));

	$grid_color[]	= imagecolorallocate($im, color('grid'), color('grid'), color('grid'));

	$grid_color[]	= $grid_color[0] + 150;

	$grid_color[]	= $grid_color[0] + 180;

	$grid_color[]	= $grid_color[0] + 210;

	$shadow_color	= imagecolorallocate($im, 255, 240, 240);



	// -----------------------------------

	//  Create the rectangle

	// -----------------------------------



	ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);



	if ( $show_grid == TRUE )

	{

		// X grid

		$grid = rand(12,22);

		for ($x = 0; $x < $img_width; $x += mt_rand($grid - 2, $grid + 3))

		{

			$current_colour = $grid_color[array_rand($grid_color)];

			imagedashedline($im, mt_rand($x -3, $x + 3), mt_rand(0, 4), mt_rand($x -3, $x + 3), mt_rand($img_height - 5, $img_height), $current_colour);

		}



		// Y grid

		for ($y = 0; $y < $img_height; $y += mt_rand($grid - 2, $grid + 2))

		{

			$current_colour = $grid_color[array_rand($grid_color)];

			imageline($im, mt_rand(4,8), mt_rand($y - 3, $y), mt_rand($img_width - 5, $img_width), mt_rand($y - 3, $y), $current_colour);

		}

	}



	// -----------------------------------

	//  Write the text

	// -----------------------------------



	$use_font = ($font_file != '' AND file_exists($font_file) AND function_exists('imagettftext')) ? TRUE : FALSE;



	if ($use_font == FALSE)

	{

		$font_size = rand(8,9);

		$x = rand(2, $img_width/($length/3));

		// y isnt used here

	}

	else

	{

		// Make font proportional to the image size

		$font_size	= !empty($font_size) ? $font_size : mt_rand(18,20);

		$x = rand(4, $img_width - (($font_size + ($font_size >> 1)) * $length));

		// y isnt used here

	}



	for ($i = 0; $i < strlen($word); $i++)

	{

		if ($use_font == FALSE)

		{

			$y = rand(0 , $img_height/2);

			imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);

			$x += ($font_size*2);

		}

		else

		{

			$letter = substr($word, $i, 1);

			$less_rotate = array('c', 'N', 'U', 'Z', '7', '6', '9'); //letters that we don't want rotated too much...



			$angle = $skew == TRUE ? (in_array($letter, $less_rotate)) ? rand(-5, 5) : rand(-15, 15) : 0;

			$y = $img_height/2 + ($font_size >> 1) + ($skew == TRUE ? rand(-9, 9) : 0);

			$x += ($font_size >> 1.1);

			imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_file, $letter);

			$x += $font_size + ($font_size >> 2);

		}

	}





	// -----------------------------------

	//  Create the border

	// -----------------------------------



	imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);



	// -----------------------------------

	//  Generate the image

	// -----------------------------------



	$img_name = $now.'.png';



	ImagePNG($im, $img_path.$img_name);



	$img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" class='captchaImage' style=\"border:0;\" alt=\" \" />";



	ImageDestroy($im);



	return array('word' => $word, 'time' => $now, 'image' => $img);

}



?>