File class\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 (https://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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