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File: system/helpers/captcha_helper.php

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File: system/helpers/captcha_helper.php
Role: Example script
Content type: text/plain
Description: Example script
Class: PHP Attendance Management System using Fingerprint
Keep track of employee attendance with fingerprint
Author: By
Last change: improve feature, now with datables, fix some bugs

improve feature, now with datables, fix some bugs
Date: 10 months ago
Size: 11,521 bytes
 

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<?php /** * CodeIgniter * * An open source application development framework for PHP * * This content is released under the MIT License (MIT) * * Copyright (c) 2014 - 2018, 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. (https://ellislab.com/) * @copyright Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/) * @license http://opensource.org/licenses/MIT MIT License * @link https://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 https://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 (deprecated) * @param string $img_url URL to the CAPTCHA image folder (deprecated) * @param string $font_path Server path to font (deprecated) * @return string */ function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '') { $defaults = array( 'word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200, 'word_length' => 8, 'font_size' => 16, 'img_id' => '', 'pool' => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', 'colors' => array( 'background' => array(255, 255, 255), 'border' => array(153, 102, 102), 'text' => array(204, 153, 153), 'grid' => array(255, 182, 182) ) ); foreach ($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 (in_array(substr($filename, -4), array('.jpg', '.png')) && (str_replace(array('.jpg', '.png'), '', $filename) + $expiration) < $now) { @unlink($img_path . $filename); } } @closedir($current_dir); // ----------------------------------- // Do we have a "word" yet? // ----------------------------------- if (empty($word)) { $word = ''; $pool_length = strlen($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)) { // Nobody will have a larger character pool than // 256 characters, but let's handle it just in case ... // // No, I do not care that the fallback to mt_rand() can // handle it; if you trigger this, you're very obviously // trying to break it. -- Narf if ($pool_length > 256) { return FALSE; } // We'll try using the operating system's PRNG first, // which we can access through CI_Security::get_random_bytes() $security = get_instance()->security; // To avoid numerous get_random_bytes() calls, we'll // just try fetching as much bytes as we need at once. if (($bytes = $security->get_random_bytes($pool_length)) !== FALSE) { $byte_index = $word_index = 0; while ($word_index < $word_length) { // Do we have more random data to use? // It could be exhausted by previous iterations // ignoring bytes higher than $rand_max. if ($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 = $security->get_random_bytes($pool_length)) === FALSE) { continue; } $byte_index = 0; break; } if ($bytes === FALSE) { // Sadly, this means fallback to mt_rand() $word = ''; break; } } list(, $rand_index) = unpack('C', $bytes[$byte_index++]); if ($rand_index > $rand_max) { 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) ? 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) && $font_size = 5; $x = mt_rand(0, $img_width / ($length / 3)); $y = 0; } else { ($font_size > 30) && $font_size = 30; $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; } $img = '<img ' . ($img_id === '' ? '' : 'id="' . $img_id . '"') . ' 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); } }