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339 lines
9.2 KiB
339 lines
9.2 KiB
<?php |
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/** |
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* CodeIgniter |
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* |
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* An open source application development framework for PHP |
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* |
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* This content is released under the MIT License (MIT) |
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* |
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* Copyright (c) 2014 - 2016, British Columbia Institute of Technology |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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* |
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* @package CodeIgniter |
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* @author EllisLab Dev Team |
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/) |
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* @copyright Copyright (c) 2014 - 2016, British Columbia Institute of Technology (http://bcit.ca/) |
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* @license http://opensource.org/licenses/MIT MIT License |
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* @link https://codeigniter.com |
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* @since Version 1.0.0 |
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* @filesource |
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*/ |
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defined('BASEPATH') OR exit('No direct script access allowed'); |
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/** |
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* CodeIgniter CAPTCHA Helper |
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* |
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* @package CodeIgniter |
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* @subpackage Helpers |
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* @category Helpers |
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* @author EllisLab Dev Team |
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* @link https://codeigniter.com/user_guide/helpers/captcha_helper.html |
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*/ |
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// ------------------------------------------------------------------------ |
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if ( ! function_exists('create_captcha')) |
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{ |
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/** |
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* Create CAPTCHA |
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* |
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* @param array $data data for the CAPTCHA |
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* @param string $img_path path to create the image in |
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* @param string $img_url URL to the CAPTCHA image folder |
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* @param string $font_path server path to font |
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* @return string |
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*/ |
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function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '') |
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{ |
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$defaults = array( |
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'word' => '', |
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'img_path' => '', |
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'img_url' => '', |
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'img_width' => '150', |
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'img_height' => '30', |
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'font_path' => '', |
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'expiration' => 7200, |
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'word_length' => 8, |
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'font_size' => 16, |
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'img_id' => '', |
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'pool' => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ', |
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'colors' => array( |
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'background' => array(255,255,255), |
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'border' => array(153,102,102), |
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'text' => array(204,153,153), |
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'grid' => array(255,182,182) |
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) |
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); |
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foreach ($defaults as $key => $val) |
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{ |
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if ( ! is_array($data) && empty($$key)) |
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{ |
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$$key = $val; |
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} |
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else |
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{ |
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$$key = isset($data[$key]) ? $data[$key] : $val; |
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} |
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} |
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if ($img_path === '' OR $img_url === '' |
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OR ! is_dir($img_path) OR ! is_really_writable($img_path) |
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OR ! extension_loaded('gd')) |
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{ |
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return FALSE; |
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} |
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// ----------------------------------- |
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// Remove old images |
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// ----------------------------------- |
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$now = microtime(TRUE); |
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$current_dir = @opendir($img_path); |
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while ($filename = @readdir($current_dir)) |
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{ |
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if (substr($filename, -4) === '.jpg' && (str_replace('.jpg', '', $filename) + $expiration) < $now) |
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{ |
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@unlink($img_path.$filename); |
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} |
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} |
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@closedir($current_dir); |
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// ----------------------------------- |
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// Do we have a "word" yet? |
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// ----------------------------------- |
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if (empty($word)) |
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{ |
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$word = ''; |
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$pool_length = strlen($pool); |
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$rand_max = $pool_length - 1; |
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// PHP7 or a suitable polyfill |
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if (function_exists('random_int')) |
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{ |
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try |
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{ |
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for ($i = 0; $i < $word_length; $i++) |
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{ |
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$word .= $pool[random_int(0, $rand_max)]; |
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} |
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} |
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catch (Exception $e) |
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{ |
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// This means fallback to the next possible |
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// alternative to random_int() |
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$word = ''; |
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} |
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} |
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} |
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if (empty($word)) |
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{ |
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// Nobody will have a larger character pool than |
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// 256 characters, but let's handle it just in case ... |
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// |
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// No, I do not care that the fallback to mt_rand() can |
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// handle it; if you trigger this, you're very obviously |
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// trying to break it. -- Narf |
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if ($pool_length > 256) |
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{ |
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return FALSE; |
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} |
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// We'll try using the operating system's PRNG first, |
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// which we can access through CI_Security::get_random_bytes() |
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$security = get_instance()->security; |
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// To avoid numerous get_random_bytes() calls, we'll |
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// just try fetching as much bytes as we need at once. |
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if (($bytes = $security->get_random_bytes($pool_length)) !== FALSE) |
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{ |
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$byte_index = $word_index = 0; |
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while ($word_index < $word_length) |
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{ |
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list(, $rand_index) = unpack('C', $bytes[$byte_index++]); |
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if ($rand_index > $rand_max) |
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{ |
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// Was this the last byte we have? |
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// If so, try to fetch more. |
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if ($byte_index === $pool_length) |
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{ |
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// No failures should be possible if |
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// the first get_random_bytes() call |
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// didn't return FALSE, but still ... |
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for ($i = 0; $i < 5; $i++) |
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{ |
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if (($bytes = $security->get_random_bytes($pool_length)) === FALSE) |
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{ |
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continue; |
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} |
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$byte_index = 0; |
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break; |
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} |
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if ($bytes === FALSE) |
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{ |
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// Sadly, this means fallback to mt_rand() |
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$word = ''; |
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break; |
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} |
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} |
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continue; |
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} |
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$word .= $pool[$rand_index]; |
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$word_index++; |
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} |
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} |
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} |
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if (empty($word)) |
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{ |
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for ($i = 0; $i < $word_length; $i++) |
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{ |
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$word .= $pool[mt_rand(0, $rand_max)]; |
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} |
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} |
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elseif ( ! is_string($word)) |
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{ |
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$word = (string) $word; |
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} |
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// ----------------------------------- |
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// Determine angle and position |
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// ----------------------------------- |
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$length = strlen($word); |
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$angle = ($length >= 6) ? mt_rand(-($length-6), ($length-6)) : 0; |
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$x_axis = mt_rand(6, (360/$length)-16); |
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$y_axis = ($angle >= 0) ? mt_rand($img_height, $img_width) : mt_rand(6, $img_height); |
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// Create image |
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// PHP.net recommends imagecreatetruecolor(), but it isn't always available |
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$im = function_exists('imagecreatetruecolor') |
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? imagecreatetruecolor($img_width, $img_height) |
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: imagecreate($img_width, $img_height); |
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// ----------------------------------- |
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// Assign colors |
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// ---------------------------------- |
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is_array($colors) OR $colors = $defaults['colors']; |
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foreach (array_keys($defaults['colors']) as $key) |
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{ |
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// Check for a possible missing value |
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is_array($colors[$key]) OR $colors[$key] = $defaults['colors'][$key]; |
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$colors[$key] = imagecolorallocate($im, $colors[$key][0], $colors[$key][1], $colors[$key][2]); |
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} |
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// Create the rectangle |
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ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $colors['background']); |
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// ----------------------------------- |
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// Create the spiral pattern |
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// ----------------------------------- |
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$theta = 1; |
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$thetac = 7; |
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$radius = 16; |
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$circles = 20; |
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$points = 32; |
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for ($i = 0, $cp = ($circles * $points) - 1; $i < $cp; $i++) |
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{ |
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$theta += $thetac; |
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$rad = $radius * ($i / $points); |
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$x = ($rad * cos($theta)) + $x_axis; |
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$y = ($rad * sin($theta)) + $y_axis; |
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$theta += $thetac; |
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$rad1 = $radius * (($i + 1) / $points); |
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$x1 = ($rad1 * cos($theta)) + $x_axis; |
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$y1 = ($rad1 * sin($theta)) + $y_axis; |
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imageline($im, $x, $y, $x1, $y1, $colors['grid']); |
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$theta -= $thetac; |
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} |
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// ----------------------------------- |
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// Write the text |
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// ----------------------------------- |
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$use_font = ($font_path !== '' && file_exists($font_path) && function_exists('imagettftext')); |
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if ($use_font === FALSE) |
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{ |
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($font_size > 5) && $font_size = 5; |
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$x = mt_rand(0, $img_width / ($length / 3)); |
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$y = 0; |
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} |
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else |
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{ |
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($font_size > 30) && $font_size = 30; |
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$x = mt_rand(0, $img_width / ($length / 1.5)); |
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$y = $font_size + 2; |
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} |
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for ($i = 0; $i < $length; $i++) |
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{ |
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if ($use_font === FALSE) |
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{ |
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$y = mt_rand(0 , $img_height / 2); |
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imagestring($im, $font_size, $x, $y, $word[$i], $colors['text']); |
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$x += ($font_size * 2); |
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} |
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else |
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{ |
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$y = mt_rand($img_height / 2, $img_height - 3); |
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imagettftext($im, $font_size, $angle, $x, $y, $colors['text'], $font_path, $word[$i]); |
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$x += $font_size; |
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} |
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} |
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// Create the border |
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imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $colors['border']); |
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// ----------------------------------- |
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// Generate the image |
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// ----------------------------------- |
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$img_url = rtrim($img_url, '/').'/'; |
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if (function_exists('imagejpeg')) |
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{ |
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$img_filename = $now.'.jpg'; |
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imagejpeg($im, $img_path.$img_filename); |
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} |
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elseif (function_exists('imagepng')) |
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{ |
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$img_filename = $now.'.png'; |
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imagepng($im, $img_path.$img_filename); |
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} |
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else |
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{ |
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return FALSE; |
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} |
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$img = '<img '.($img_id === '' ? '' : 'id="'.$img_id.'"').' src="'.$img_url.$img_filename.'" style="width: '.$img_width.'; height: '.$img_height .'; border: 0;" alt=" " />'; |
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ImageDestroy($im); |
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return array('word' => $word, 'time' => $now, 'image' => $img, 'filename' => $img_filename); |
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} |
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}
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