File lass/captcha/image.php

 1: <?php
 2: /**
 3:  * CAPTCHA for Image mode
 4:  *
 5:  * Based on DuGris' SecurityImage
 6:  *
 7:  * You may not change or alter any portion of this comment or credits
 8:  * of supporting developers from this source code or any supporting source code
 9:  * which is considered copyrighted (c) material of the original comment or credit authors.
10:  * This program is distributed in the hope that it will be useful,
11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13:  *
14:  * @copyright       (c) 2000-2016 XOOPS Project (www.xoops.org)
15:  * @license             GNU GPL 2 (http://www.gnu.org/licenses/gpl-2.0.html)
16:  * @package             class
17:  * @subpackage          CAPTCHA
18:  * @since               2.3.0
19:  * @author              Taiwen Jiang <phppp@users.sourceforge.net>
20:  */
21: defined('XOOPS_ROOT_PATH') || exit('Restricted access');
22: 
23: /**
24:  * Class XoopsCaptchaImage
25:  */
26: class XoopsCaptchaImage extends XoopsCaptchaMethod
27: {
28:     /**
29:      * XoopsCaptchaImage::isActive()
30:      *
31:      * @return bool
32:      */
33:     public function isActive()
34:     {
35:         if (!extension_loaded('gd')) {
36:             trigger_error('GD library is not loaded', E_USER_WARNING);
37: 
38:             return false;
39:         } else {
40:             $required_functions = array(
41:                 'imagecreatetruecolor',
42:                 'imagecolorallocate',
43:                 'imagefilledrectangle',
44:                 'imagejpeg',
45:                 'imagedestroy',
46:                 'imageftbbox');
47:             foreach ($required_functions as $func) {
48:                 if (!function_exists($func)) {
49:                     trigger_error('Function ' . $func . ' is not defined', E_USER_WARNING);
50: 
51:                     return false;
52:                 }
53:             }
54:         }
55: 
56:         return true;
57:     }
58: 
59:     /**
60:      * XoopsCaptchaImage::render()
61:      *
62:      * @return string|void
63:      */
64:     public function render()
65:     {
66:         $js    = "<script type='text/javascript'>
67:                 function xoops_captcha_refresh(imgId)
68:                 {
69:                     xoopsGetElementById(imgId).src = '" . XOOPS_URL . "/class/captcha/image/scripts/image.php?refresh='+Math.random();
70:                 }
71:                 </script>";
72:         $image = $this->loadImage();
73:         $image .= "<br><a href=\"javascript: xoops_captcha_refresh('" . $this->config['name'] . "')\">" . _CAPTCHA_REFRESH . '</a>';
74:         $input = '<input type="text" name="' . $this->config['name'] . '" id="' . $this->config['name'] . '" size="' . $this->config['num_chars'] . '" maxlength="' . $this->config['num_chars'] . '" value="" />';
75:         $rule  = _CAPTCHA_RULE_IMAGE;
76:         $rule .= '<br>' . (empty($this->config['casesensitive']) ? _CAPTCHA_RULE_CASEINSENSITIVE : _CAPTCHA_RULE_CASESENSITIVE);
77:         if (!empty($this->config['maxattempts'])) {
78:             $rule .= '<br>' . sprintf(_CAPTCHA_MAXATTEMPTS, $this->config['maxattempts']);
79:         }
80: 
81:         return $js . $image . '<br><br>' . $input . '<br>' . $rule;
82:     }
83: 
84:     /**
85:      * XoopsCaptchaImage::loadImage()
86:      *
87:      * @return string
88:      */
89:     public function loadImage()
90:     {
91:         return '<img id="' . $this->config['name'] . '" src="' . XOOPS_URL . '/class/captcha/image/scripts/image.php" onclick=\'this.src="' . XOOPS_URL . '/class/captcha/image/scripts/image.php?refresh="+Math.random()' . '\' style="cursor: pointer; vertical-align: middle;" alt="" />';
92:     }
93: }
94:
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