/system/helpers/captcha_helper.php
PHP | 336 lines | 200 code | 53 blank | 83 comment | 39 complexity | e9ea588ed90abdddeec9f74c1b7c00dd MD5 | raw file
- <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
- /**
- * CodeIgniter
- *
- * An open source application development framework for PHP 5.1.6 or newer
- *
- * @package CodeIgniter
- * @author EllisLab Dev Team
- * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc.
- * @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
- * @license http://codeigniter.com/user_guide/license.html
- * @link http://codeigniter.com
- * @since Version 1.0
- * @filesource
- */
- // ------------------------------------------------------------------------
- /**
- * CodeIgniter CAPTCHA Helper
- *
- * @package CodeIgniter
- * @subpackage Helpers
- * @category Helpers
- * @author EllisLab Dev Team
- * @link http://codeigniter.com/user_guide/helpers/xml_helper.html
- */
- // ------------------------------------------------------------------------
- /**
- * Create CAPTCHA
- *
- * @access public
- * @param array array of data for the CAPTCHA
- * @param string path to create the image in
- * @param string URL to the CAPTCHA image folder
- * @param string server path to font
- * @return string
- */
- if ( ! function_exists('create_captcha'))
- {
- function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '')
- {
- $defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);
- foreach ($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_writable($img_path))
- {
- return FALSE;
- }
- if ( ! extension_loaded('gd'))
- {
- return FALSE;
- }
- // -----------------------------------
- // Remove old images
- // -----------------------------------
- list($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(".jpg", "", $filename);
- if (($name + $expiration) < $now)
- {
- @unlink($img_path.$filename);
- }
- }
- }
- @closedir($current_dir);
- // -----------------------------------
- // Do we have a "word" yet?
- // -----------------------------------
- // -----------------------------------
- // Do we have a "word" yet?
- // -----------------------------------
- if (empty($word))
- {
- $word = '';
- $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
- $pool_length = strlen($pool);
- $rand_max = $pool_length - 1;
- // PHP7 or a suitable polyfill
- if (function_exists('random_int'))
- {
- try
- {
- for ($i = 0; $i < $word_length; $i++)
- {
- $word .= $pool[random_int(0, $rand_max)];
- }
- }
- catch (Exception $e)
- {
- // This means fallback to the next possible
- // alternative to random_int()
- $word = '';
- }
- }
- }
- if (empty($word))
- {
- // To avoid numerous get_random_bytes() calls, we'll
- // just try fetching as much bytes as we need at once.
- if (($bytes = _ci_captcha_get_random_bytes($pool_length)) !== FALSE)
- {
- $byte_index = $word_index = 0;
- while ($word_index < $word_length)
- {
- if (($rand_index = unpack('C', $bytes[$byte_index++])) > $rand_max)
- {
- // Was this the last byte we have?
- // If so, try to fetch more.
- if ($byte_index === $pool_length)
- {
- // No failures should be possible if
- // the first get_random_bytes() call
- // didn't return FALSE, but still ...
- for ($i = 0; $i < 5; $i++)
- {
- if (($bytes = _ci_captcha_get_random_bytes($pool_length)) === FALSE)
- {
- continue;
- }
- $byte_index = 0;
- break;
- }
- if ($bytes === FALSE)
- {
- // Sadly, this means fallback to mt_rand()
- $word = '';
- break;
- }
- }
- continue;
- }
- $word .= $pool[$rand_index];
- $word_index++;
- }
- }
- }
- if (empty($word))
- {
- for ($i = 0; $i < $word_length; $i++)
- {
- $word .= $pool[mt_rand(0, $rand_max)];
- }
- }
- elseif ( ! is_string($word))
- {
- $word = (string) $word;
- }
- // -----------------------------------
- // Determine angle and position
- // -----------------------------------
- $length = strlen($word);
- $angle = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
- $x_axis = rand(6, (360/$length)-16);
- $y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
- // -----------------------------------
- // Create image
- // -----------------------------------
- // PHP.net recommends imagecreatetruecolor(), but it isn't always available
- if (function_exists('imagecreatetruecolor'))
- {
- $im = imagecreatetruecolor($img_width, $img_height);
- }
- else
- {
- $im = imagecreate($img_width, $img_height);
- }
- // -----------------------------------
- // Assign colors
- // -----------------------------------
- $bg_color = imagecolorallocate ($im, 255, 255, 255);
- $border_color = imagecolorallocate ($im, 153, 102, 102);
- $text_color = imagecolorallocate ($im, 204, 153, 153);
- $grid_color = imagecolorallocate($im, 255, 182, 182);
- $shadow_color = imagecolorallocate($im, 255, 240, 240);
- // -----------------------------------
- // Create the rectangle
- // -----------------------------------
- ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
- // -----------------------------------
- // Create the spiral pattern
- // -----------------------------------
- $theta = 1;
- $thetac = 7;
- $radius = 16;
- $circles = 20;
- $points = 32;
- for ($i = 0; $i < ($circles * $points) - 1; $i++)
- {
- $theta = $theta + $thetac;
- $rad = $radius * ($i / $points );
- $x = ($rad * cos($theta)) + $x_axis;
- $y = ($rad * sin($theta)) + $y_axis;
- $theta = $theta + $thetac;
- $rad1 = $radius * (($i + 1) / $points);
- $x1 = ($rad1 * cos($theta)) + $x_axis;
- $y1 = ($rad1 * sin($theta )) + $y_axis;
- imageline($im, $x, $y, $x1, $y1, $grid_color);
- $theta = $theta - $thetac;
- }
- // -----------------------------------
- // Write the text
- // -----------------------------------
- $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;
- if ($use_font == FALSE)
- {
- $font_size = 5;
- $x = rand(0, $img_width/($length/3));
- $y = 0;
- }
- else
- {
- $font_size = 16;
- $x = rand(0, $img_width/($length/1.5));
- $y = $font_size+2;
- }
- for ($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
- {
- $y = rand($img_height/2, $img_height-3);
- imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
- $x += $font_size;
- }
- }
- // -----------------------------------
- // Create the border
- // -----------------------------------
- imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);
- // -----------------------------------
- // Generate the image
- // -----------------------------------
- $img_name = $now.'.jpg';
- ImageJPEG($im, $img_path.$img_name);
- $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";
- ImageDestroy($im);
- return array('word' => $word, 'time' => $now, 'image' => $img);
- }
- function _ci_captcha_get_random_bytes($length)
- {
- if (defined('MCRYPT_DEV_URANDOM'))
- {
- return mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
- }
- elseif (function_exists('openssl_random_pseudo_bytes'))
- {
- return openssl_random_pseudo_bytes($length);
- }
- return FALSE;
- }
- }
- // ------------------------------------------------------------------------
- /* End of file captcha_helper.php */
- /* Location: ./system/heleprs/captcha_helper.php */