File lass/captcha/text.php

 1: <?php
 2: /**
 3:  * CAPTCHA for text mode
 4:  *
 5:  * You may not change or alter any portion of this comment or credits
 6:  * of supporting developers from this source code or any supporting source code
 7:  * which is considered copyrighted (c) material of the original comment or credit authors.
 8:  * This program is distributed in the hope that it will be useful,
 9:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11:  *
12:  * @copyright       (c) 2000-2016 XOOPS Project (www.xoops.org)
13:  * @license             GNU GPL 2 (http://www.gnu.org/licenses/gpl-2.0.html)
14:  * @package             class
15:  * @subpackage          CAPTCHA
16:  * @since               2.3.0
17:  * @author              Taiwen Jiang <phppp@users.sourceforge.net>
18:  */
19: defined('XOOPS_ROOT_PATH') || exit('Restricted access');
20: 
21: /**
22:  * Class XoopsCaptchaText
23:  */
24: class XoopsCaptchaText extends XoopsCaptchaMethod
25: {
26: 
27:     /** @var string  */
28:     protected $outputText = '';
29:     /**
30:      * XoopsCaptchaMethod::__construct()
31:      *
32:      * @param mixed $handler
33:      */
34:     public function __construct($handler = null)
35:     {
36:         parent::__construct($handler);
37:         $this->buildQuestion();
38:     }
39: 
40:     /**
41:      * XoopsCaptchaText::render()
42:      *
43:      * @return string|void
44:      */
45:     public function render()
46:     {
47:         $form = $this->loadText() . '&nbsp;&nbsp; <input type="text" name="' . $this->config['name'] . '" id="' . $this->config['name'] . '" size="' . $this->config['num_chars'] . '" maxlength="' . $this->config['num_chars'] . '" value="" />';
48:         $form .= '<br>' . _CAPTCHA_RULE_TEXT;
49:         if (!empty($this->config['maxattempts'])) {
50:             $form .= '<br>' . sprintf(_CAPTCHA_MAXATTEMPTS, $this->config['maxattempts']);
51:         }
52: 
53:         return $form;
54:     }
55: 
56:     /**
57:      * XoopsCaptchaText::loadText()
58:      *
59:      * @return string
60:      */
61:     public function loadText()
62:     {
63:         return '<span style="font-style: normal; font-weight: bold; font-size: 100%; color: #333; border: 1px solid #333; padding: 1px 5px;">' . $this->outputText . '</span>';
64:     }
65: 
66:     protected function buildQuestion()
67:     {
68:         $val_a = mt_rand(0, 9);
69:         $val_b = mt_rand(0, 9);
70:         if ($val_a > $val_b) {
71:             $expression = "{$val_a} - {$val_b} = ?";
72:             $this->code = $val_a - $val_b;
73:         } else {
74:             $expression = "{$val_a} + {$val_b} = ?";
75:             $this->code = $val_a + $val_b;
76:         }
77: 
78:         $this->outputText = $expression;
79:     }
80: }
81:
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