summaryrefslogtreecommitdiffstats
path: root/system/helpers/captcha_helper.php
diff options
context:
space:
mode:
Diffstat (limited to 'system/helpers/captcha_helper.php')
-rw-r--r--system/helpers/captcha_helper.php351
1 files changed, 223 insertions, 128 deletions
diff --git a/system/helpers/captcha_helper.php b/system/helpers/captcha_helper.php
index bcc7dbc72..8f44806cc 100644
--- a/system/helpers/captcha_helper.php
+++ b/system/helpers/captcha_helper.php
@@ -1,19 +1,41 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php
/**
* CodeIgniter
*
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP
*
- * @package CodeIgniter
- * @author ExpressionEngine Dev Team
- * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc.
- * @license http://codeigniter.com/user_guide/license.html
- * @link http://codeigniter.com
- * @since Version 1.0
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2017, 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 - 2017, 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
@@ -21,59 +43,60 @@
* @package CodeIgniter
* @subpackage Helpers
* @category Helpers
- * @author ExpressionEngine Dev Team
- * @link http://codeigniter.com/user_guide/helpers/xml_helper.html
+ * @author EllisLab Dev Team
+ * @link https://codeigniter.com/user_guide/helpers/captcha_helper.html
*/
// ------------------------------------------------------------------------
-/**
- * Create CAPTCHA
- *
- * @access public
- * @param array array of data for the CAPTCHA
- * @param string path to create the image in
- * @param string URL to the CAPTCHA image folder
- * @param string server path to font
- * @return string
- */
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);
+ $defaults = array(
+ 'word' => '',
+ 'img_path' => '',
+ 'img_url' => '',
+ 'img_width' => '150',
+ 'img_height' => '30',
+ 'font_path' => '',
+ 'expiration' => 7200,
+ 'word_length' => 8,
+ 'font_size' => 16,
+ 'img_id' => '',
+ 'pool' => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
+ 'colors' => array(
+ 'background' => array(255,255,255),
+ 'border' => array(153,102,102),
+ 'text' => array(204,153,153),
+ 'grid' => array(255,182,182)
+ )
+ );
foreach ($defaults as $key => $val)
{
- if ( ! is_array($data))
+ if ( ! is_array($data) && empty($$key))
{
- if ( ! isset($$key) OR $$key == '')
- {
- $$key = $val;
- }
+ $$key = $val;
}
else
{
- $$key = ( ! isset($data[$key])) ? $val : $data[$key];
+ $$key = isset($data[$key]) ? $data[$key] : $val;
}
}
- if ($img_path == '' OR $img_url == '')
- {
- return FALSE;
- }
-
- if ( ! @is_dir($img_path))
- {
- return FALSE;
- }
-
- if ( ! is_writable($img_path))
- {
- return FALSE;
- }
-
- if ( ! extension_loaded('gd'))
+ if ($img_path === '' OR $img_url === ''
+ OR ! is_dir($img_path) OR ! is_really_writable($img_path)
+ OR ! extension_loaded('gd'))
{
return FALSE;
}
@@ -82,21 +105,15 @@ if ( ! function_exists('create_captcha'))
// Remove old images
// -----------------------------------
- list($usec, $sec) = explode(" ", microtime());
- $now = ((float)$usec + (float)$sec);
+ $now = microtime(TRUE);
$current_dir = @opendir($img_path);
-
while ($filename = @readdir($current_dir))
{
- if ($filename != "." and $filename != ".." and $filename != "index.html")
+ if (in_array(substr($filename, -4), array('.jpg', '.png'))
+ && (str_replace(array('.jpg', '.png'), '', $filename) + $expiration) < $now)
{
- $name = str_replace(".jpg", "", $filename);
-
- if (($name + $expiration) < $now)
- {
- @unlink($img_path.$filename);
- }
+ @unlink($img_path.$filename);
}
}
@@ -106,141 +123,219 @@ if ( ! function_exists('create_captcha'))
// Do we have a "word" yet?
// -----------------------------------
- if ($word == '')
- {
- $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
+ if (empty($word))
+ {
+ $word = '';
+ $pool_length = strlen($pool);
+ $rand_max = $pool_length - 1;
- $str = '';
- for ($i = 0; $i < 8; $i++)
+ // PHP7 or a suitable polyfill
+ if (function_exists('random_int'))
{
- $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
+ try
+ {
+ for ($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 = '';
+ }
}
+ }
- $word = $str;
- }
-
- // -----------------------------------
- // Determine angle and position
- // -----------------------------------
+ if (empty($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;
+ }
- $length = strlen($word);
- $angle = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
- $x_axis = rand(6, (360/$length)-16);
- $y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);
+ // We'll try using the operating system's PRNG first,
+ // which we can access through CI_Security::get_random_bytes()
+ $security = get_instance()->security;
- // -----------------------------------
- // Create image
- // -----------------------------------
+ // To avoid numerous get_random_bytes() calls, we'll
+ // just try fetching as much bytes as we need at once.
+ if (($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];
+ $word_index++;
+ }
+ }
+ }
- // PHP.net recommends imagecreatetruecolor(), but it isn't always available
- if (function_exists('imagecreatetruecolor'))
+ if (empty($word))
{
- $im = imagecreatetruecolor($img_width, $img_height);
+ for ($i = 0; $i < $word_length; $i++)
+ {
+ $word .= $pool[mt_rand(0, $rand_max)];
+ }
}
- else
+ elseif ( ! is_string($word))
{
- $im = imagecreate($img_width, $img_height);
+ $word = (string) $word;
}
// -----------------------------------
- // Assign colors
+ // 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);
- $bg_color = imagecolorallocate ($im, 255, 255, 255);
- $border_color = imagecolorallocate ($im, 153, 102, 102);
- $text_color = imagecolorallocate ($im, 204, 153, 153);
- $grid_color = imagecolorallocate($im, 255, 182, 182);
- $shadow_color = imagecolorallocate($im, 255, 240, 240);
+ // Create image
+ // PHP.net recommends imagecreatetruecolor(), but it isn't always available
+ $im = function_exists('imagecreatetruecolor')
+ ? imagecreatetruecolor($img_width, $img_height)
+ : imagecreate($img_width, $img_height);
// -----------------------------------
- // Create the rectangle
- // -----------------------------------
+ // Assign colors
+ // ----------------------------------
+
+ is_array($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]);
+ }
- ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);
+ // Create the rectangle
+ ImageFilledRectangle($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; $i < ($circles * $points) - 1; $i++)
+ for ($i = 0, $cp = ($circles * $points) - 1; $i < $cp; $i++)
{
- $theta = $theta + $thetac;
- $rad = $radius * ($i / $points );
+ $theta += $thetac;
+ $rad = $radius * ($i / $points);
$x = ($rad * cos($theta)) + $x_axis;
$y = ($rad * sin($theta)) + $y_axis;
- $theta = $theta + $thetac;
+ $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, $grid_color);
- $theta = $theta - $thetac;
+ $y1 = ($rad1 * sin($theta)) + $y_axis;
+ imageline($im, $x, $y, $x1, $y1, $colors['grid']);
+ $theta -= $thetac;
}
// -----------------------------------
// Write the text
// -----------------------------------
- $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;
-
- if ($use_font == FALSE)
+ $use_font = ($font_path !== '' && file_exists($font_path) && function_exists('imagettftext'));
+ if ($use_font === FALSE)
{
- $font_size = 5;
- $x = rand(0, $img_width/($length/3));
+ ($font_size > 5) && $font_size = 5;
+ $x = mt_rand(0, $img_width / ($length / 3));
$y = 0;
}
else
{
- $font_size = 16;
- $x = rand(0, $img_width/($length/1.5));
- $y = $font_size+2;
+ ($font_size > 30) && $font_size = 30;
+ $x = mt_rand(0, $img_width / ($length / 1.5));
+ $y = $font_size + 2;
}
- for ($i = 0; $i < strlen($word); $i++)
+ for ($i = 0; $i < $length; $i++)
{
- if ($use_font == FALSE)
+ if ($use_font === FALSE)
{
- $y = rand(0 , $img_height/2);
- imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
- $x += ($font_size*2);
+ $y = mt_rand(0 , $img_height / 2);
+ imagestring($im, $font_size, $x, $y, $word[$i], $colors['text']);
+ $x += ($font_size * 2);
}
else
{
- $y = rand($img_height/2, $img_height-3);
- imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
+ $y = mt_rand($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, $border_color);
+ // Create the border
+ imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $colors['border']);
// -----------------------------------
// Generate the image
// -----------------------------------
+ $img_url = rtrim($img_url, '/').'/';
- $img_name = $now.'.jpg';
-
- ImageJPEG($im, $img_path.$img_name);
-
- $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";
+ 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);
+ return array('word' => $word, 'time' => $now, 'image' => $img, 'filename' => $img_filename);
}
}
-
-// ------------------------------------------------------------------------
-
-/* End of file captcha_helper.php */
-/* Location: ./system/heleprs/captcha_helper.php */ \ No newline at end of file
generated by cgit v1.2.3-24-g4f1b (git 2.32.0) at 2024-11-14 01:04:25 +0100