add rssa-pintar to git
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ryan
336
default/system/helpers/captcha_helper.php
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336
default/system/helpers/captcha_helper.php
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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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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 5.1.6 or newer
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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.
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* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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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 http://codeigniter.com/user_guide/helpers/xml_helper.html
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*/
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// ------------------------------------------------------------------------
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/**
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* Create CAPTCHA
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*
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* @access public
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* @param array array of data for the CAPTCHA
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* @param string path to create the image in
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* @param string URL to the CAPTCHA image folder
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* @param string server path to font
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* @return string
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*/
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if ( ! function_exists('create_captcha'))
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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('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);
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foreach ($defaults as $key => $val)
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{
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if ( ! is_array($data))
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{
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if ( ! isset($$key) OR $$key == '')
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{
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$$key = $val;
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}
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}
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else
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{
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$$key = ( ! isset($data[$key])) ? $val : $data[$key];
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}
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}
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if ($img_path == '' OR $img_url == '')
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{
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return FALSE;
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}
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if ( ! @is_dir($img_path))
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{
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return FALSE;
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}
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if ( ! is_writable($img_path))
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{
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return FALSE;
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}
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if ( ! extension_loaded('gd'))
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{
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return FALSE;
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}
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// -----------------------------------
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// Remove old images
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// -----------------------------------
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list($usec, $sec) = explode(" ", microtime());
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$now = ((float)$usec + (float)$sec);
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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 ($filename != "." and $filename != ".." and $filename != "index.html")
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{
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$name = str_replace(".jpg", "", $filename);
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if (($name + $expiration) < $now)
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{
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@unlink($img_path.$filename);
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}
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}
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}
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@closedir($current_dir);
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// -----------------------------------
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// Do we have a "word" yet?
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// -----------------------------------
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// -----------------------------------
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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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$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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$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($word))
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{
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// To avoid numerous get_random_bytes() calls, we'll
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// just try fetching as much bytes as we need at once.
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if (($bytes = _ci_captcha_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 < $word_length)
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{
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if (($rand_index = unpack('C', $bytes[$byte_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 = _ci_captcha_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 = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
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$x_axis = rand(6, (360/$length)-16);
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$y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
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// -----------------------------------
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// Create image
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// -----------------------------------
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// PHP.net recommends imagecreatetruecolor(), but it isn't always available
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if (function_exists('imagecreatetruecolor'))
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{
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$im = imagecreatetruecolor($img_width, $img_height);
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}
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else
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{
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$im = imagecreate($img_width, $img_height);
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}
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// -----------------------------------
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// Assign colors
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// -----------------------------------
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$bg_color = imagecolorallocate ($im, 255, 255, 255);
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$border_color = imagecolorallocate ($im, 153, 102, 102);
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$text_color = imagecolorallocate ($im, 204, 153, 153);
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$grid_color = imagecolorallocate($im, 255, 182, 182);
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$shadow_color = imagecolorallocate($im, 255, 240, 240);
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// -----------------------------------
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// Create the rectangle
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// -----------------------------------
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ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
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// -----------------------------------
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// Create the spiral pattern
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// -----------------------------------
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$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; $i < ($circles * $points) - 1; $i++)
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{
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$theta = $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 = $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, $grid_color);
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$theta = $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 = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;
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if ($use_font == FALSE)
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{
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$font_size = 5;
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$x = 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 = 16;
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$x = 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; $i < strlen($word); $i++)
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{
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if ($use_font == FALSE)
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{
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$y = rand(0 , $img_height/2);
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imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
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$x += ($font_size*2);
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}
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else
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{
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$y = rand($img_height/2, $img_height-3);
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imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
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$x += $font_size;
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}
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}
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// -----------------------------------
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// Create the border
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// -----------------------------------
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imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);
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// -----------------------------------
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// Generate the image
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// -----------------------------------
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$img_name = $now.'.jpg';
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ImageJPEG($im, $img_path.$img_name);
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$img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";
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ImageDestroy($im);
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return array('word' => $word, 'time' => $now, 'image' => $img);
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}
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function _ci_captcha_get_random_bytes($length)
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{
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if (defined('MCRYPT_DEV_URANDOM'))
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{
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return mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
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}
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elseif (function_exists('openssl_random_pseudo_bytes'))
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{
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return openssl_random_pseudo_bytes($length);
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}
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return FALSE;
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}
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}
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// ------------------------------------------------------------------------
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/* End of file captcha_helper.php */
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/* Location: ./system/heleprs/captcha_helper.php */
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