/api/system/helpers/captcha_helper.php
PHP | 254 lines | 143 code | 28 blank | 83 comment | 16 complexity | 0cef87218187625a6d1bcaccd5a0a9b5 MD5 | raw file
- <?php
- /**
- * CodeIgniter
- *
- * An open source application development framework for PHP 5.2.4 or newer
- *
- * This content is released under the MIT License (MIT)
- *
- * Copyright (c) 2014, British Columbia Institute of Technology
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- * @package CodeIgniter
- * @author EllisLab Dev Team
- * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
- * @copyright Copyright (c) 2014, British Columbia Institute of Technology (http://bcit.ca/)
- * @license http://opensource.org/licenses/MIT MIT License
- * @link http://codeigniter.com
- * @since Version 1.0.0
- * @filesource
- */
- defined('BASEPATH') OR exit('No direct script access allowed');
- /**
- * CodeIgniter CAPTCHA Helper
- *
- * @package CodeIgniter
- * @subpackage Helpers
- * @category Helpers
- * @author EllisLab Dev Team
- * @link http://codeigniter.com/user_guide/helpers/captcha_helper.html
- */
- // ------------------------------------------------------------------------
- if ( ! function_exists('create_captcha'))
- {
- /**
- * Create CAPTCHA
- *
- * @param array $data data for the CAPTCHA
- * @param string $img_path path to create the image in
- * @param string $img_url URL to the CAPTCHA image folder
- * @param string $font_path server path to font
- * @return string
- */
- function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '')
- {
- $defaults = array(
- 'word' => '',
- 'img_path' => '',
- 'img_url' => '',
- 'img_width' => '150',
- 'img_height' => '30',
- 'font_path' => '',
- 'expiration' => 7200,
- 'word_length' => 8,
- 'pool' => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
- 'colors' => array(
- 'background' => array(255,255,255),
- 'border' => array(153,102,102),
- 'text' => array(204,153,153),
- 'grid' => array(255,182,182)
- )
- );
- foreach ($defaults as $key => $val)
- {
- if ( ! is_array($data) && empty($$key))
- {
- $$key = $val;
- }
- else
- {
- $$key = isset($data[$key]) ? $data[$key] : $val;
- }
- }
- if ($img_path === '' OR $img_url === ''
- OR ! is_dir($img_path) OR ! is_really_writable($img_path)
- OR ! extension_loaded('gd'))
- {
- return FALSE;
- }
- // -----------------------------------
- // Remove old images
- // -----------------------------------
- $now = microtime(TRUE);
- $current_dir = @opendir($img_path);
- while ($filename = @readdir($current_dir))
- {
- if (substr($filename, -4) === '.jpg' && (str_replace('.jpg', '', $filename) + $expiration) < $now)
- {
- @unlink($img_path.$filename);
- }
- }
- @closedir($current_dir);
- // -----------------------------------
- // Do we have a "word" yet?
- // -----------------------------------
- if (empty($word))
- {
- $word = '';
- for ($i = 0, $mt_rand_max = strlen($pool) - 1; $i < $word_length; $i++)
- {
- $word .= $pool[mt_rand(0, $mt_rand_max)];
- }
- }
- elseif ( ! is_string($word))
- {
- $word = (string) $word;
- }
- // -----------------------------------
- // Determine angle and position
- // -----------------------------------
- $length = strlen($word);
- $angle = ($length >= 6) ? mt_rand(-($length-6), ($length-6)) : 0;
- $x_axis = mt_rand(6, (360/$length)-16);
- $y_axis = ($angle >= 0) ? mt_rand($img_height, $img_width) : mt_rand(6, $img_height);
- // Create image
- // PHP.net recommends imagecreatetruecolor(), but it isn't always available
- $im = function_exists('imagecreatetruecolor')
- ? imagecreatetruecolor($img_width, $img_height)
- : imagecreate($img_width, $img_height);
- // -----------------------------------
- // Assign colors
- // ----------------------------------
- is_array($colors) OR $colors = $defaults['colors'];
- foreach (array_keys($defaults['colors']) as $key)
- {
- // Check for a possible missing value
- is_array($colors[$key]) OR $colors[$key] = $defaults['colors'][$key];
- $colors[$key] = imagecolorallocate($im, $colors[$key][0], $colors[$key][1], $colors[$key][2]);
- }
- // Create the rectangle
- ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $colors['background']);
- // -----------------------------------
- // Create the spiral pattern
- // -----------------------------------
- $theta = 1;
- $thetac = 7;
- $radius = 16;
- $circles = 20;
- $points = 32;
- for ($i = 0, $cp = ($circles * $points) - 1; $i < $cp; $i++)
- {
- $theta += $thetac;
- $rad = $radius * ($i / $points);
- $x = ($rad * cos($theta)) + $x_axis;
- $y = ($rad * sin($theta)) + $y_axis;
- $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, $colors['grid']);
- $theta -= $thetac;
- }
- // -----------------------------------
- // Write the text
- // -----------------------------------
- $use_font = ($font_path !== '' && file_exists($font_path) && function_exists('imagettftext'));
- if ($use_font === FALSE)
- {
- $font_size = 5;
- $x = mt_rand(0, $img_width / ($length / 3));
- $y = 0;
- }
- else
- {
- $font_size = 16;
- $x = mt_rand(0, $img_width / ($length / 1.5));
- $y = $font_size + 2;
- }
- for ($i = 0; $i < $length; $i++)
- {
- if ($use_font === FALSE)
- {
- $y = mt_rand(0 , $img_height / 2);
- imagestring($im, $font_size, $x, $y, $word[$i], $colors['text']);
- $x += ($font_size * 2);
- }
- else
- {
- $y = mt_rand($img_height / 2, $img_height - 3);
- imagettftext($im, $font_size, $angle, $x, $y, $colors['text'], $font_path, $word[$i]);
- $x += $font_size;
- }
- }
- // Create the border
- imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $colors['border']);
- // -----------------------------------
- // Generate the image
- // -----------------------------------
- $img_url = rtrim($img_url, '/').'/';
- if (function_exists('imagejpeg'))
- {
- $img_filename = $now.'.jpg';
- imagejpeg($im, $img_path.$img_filename);
- }
- elseif (function_exists('imagepng'))
- {
- $img_filename = $now.'.png';
- imagepng($im, $img_path.$img_filename);
- }
- else
- {
- return FALSE;
- }
- $img = '<img src="'.$img_url.$img_filename.'" style="width: '.$img_width.'; height: '.$img_height .'; border: 0;" alt=" " />';
- ImageDestroy($im);
- return array('word' => $word, 'time' => $now, 'image' => $img, 'filename' => $img_filename);
- }
- }
- /* End of file captcha_helper.php */
- /* Location: ./system/helpers/captcha_helper.php */