<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.2.4 or newer * * NOTICE OF LICENSE * * Licensed under the Open Software License version 3.0 * * This source file is subject to the Open Software License (OSL 3.0) that is * bundled with this package in the files license.txt / license.rst. It is * also available through the world wide web at this URL: * http://opensource.org/licenses/OSL-3.0 * If you did not receive a copy of the license and are unable to obtain it * through the world wide web, please send an email to * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter * @author EllisLab Dev Team * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @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 // ----------------------------------- $now = microtime(TRUE); $current_dir = @opendir($img_path); while ($filename = @readdir($current_dir)) { if ($filename != '.' && $filename != '..' && $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? // ----------------------------------- if ($word == '') { $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $str = ''; for ($i = 0; $i < 8; $i++) { $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1); } $word = $str; } // ----------------------------------- // 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 != '' && file_exists($font_path) && function_exists('imagettftext')) ? TRUE : FALSE; if ($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); } } // ------------------------------------------------------------------------ /* End of file captcha_helper.php */ /* Location: ./system/helpers/captcha_helper.php */