342 lines
9.4 KiB
PHP
342 lines
9.4 KiB
PHP
<?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 - 2019, 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 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
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* @license https://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 (deprecated)
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* @param string $img_url URL to the CAPTCHA image folder (deprecated)
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* @param string $font_path Server path to font (deprecated)
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* @return string
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*/
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function create_captcha($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 (in_array(substr($filename, -4), array('.jpg', '.png'))
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&& (str_replace(array('.jpg', '.png'), '', $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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// Do we have more random data to use?
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// It could be exhausted by previous iterations
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// ignoring bytes higher than $rand_max.
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if ($byte_index === $pool_length)
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{
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// No failures should be possible if the
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// first get_random_bytes() call didn't
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// return FALSE, but still ...
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for ($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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list(, $rand_index) = unpack('C', $bytes[$byte_index++]);
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if ($rand_index > $rand_max)
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{
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continue;
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}
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$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.'px; height: '.$img_height .'px; border: 0;" alt=" " />';
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ImageDestroy($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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