summaryrefslogtreecommitdiffstats
path: root/system/helpers/captcha_helper.php
blob: 83783324bb97a32069f8601206a4d732f59bf7f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.2.4 or newer
 *
 * NOTICE OF LICENSE
 *
 * Licensed under the Open Software License version 3.0
 *
 * This source file is subject to the Open Software License (OSL 3.0) that is
 * bundled with this package in the files license.txt / license.rst.  It is
 * also available through the world wide web at this URL:
 * http://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to obtain it
 * through the world wide web, please send an email to
 * licensing@ellislab.com so we can send you a copy immediately.
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2013, EllisLab, Inc. (http://ellislab.com/)
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CodeIgniter CAPTCHA Helper
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/captcha_helper.html
 */

// ------------------------------------------------------------------------

if ( ! function_exists('create_captcha'))
{
	/**
	 * Create CAPTCHA
	 *
	 * @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
	 */
	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);

		foreach ($defaults as $key => $val)
		{
			if ( ! is_array($data) && empty($$key))
			{
				$$key = $val;
			}
			else
			{
				$$key = isset($data[$key]) ? $data[$key] : $val;
			}
		}

		if ($img_path === '' OR $img_url === ''
			OR ! @is_dir($img_path) OR ! is_writeable($img_path)
			OR ! extension_loaded('gd'))
		{
			return FALSE;
		}

		// -----------------------------------
		// Remove old images
		// -----------------------------------

		$now = microtime(TRUE);

		$current_dir = @opendir($img_path);
		while ($filename = @readdir($current_dir))
		{
			if (substr($filename, -4) === '.jpg' && (str_replace('.jpg', '', $filename) + $expiration) < $now)
			{
				@unlink($img_path.$filename);
			}
		}

		@closedir($current_dir);

		// -----------------------------------
		// Do we have a "word" yet?
		// -----------------------------------

		if ($word === '')
		{
			$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
			$word = '';
			for ($i = 0, $mt_rand_max = strlen($pool) - 1; $i < 8; $i++)
			{
				$word .= $pool[mt_rand(0, $mt_rand_max)];
			}
		}

		// -----------------------------------
		// Determine angle and position
		// -----------------------------------
		$length	= strlen($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);

		// 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);

		// -----------------------------------
		//  Assign colors
		// -----------------------------------
		$bg_color	= imagecolorallocate($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 the rectangle
		ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);

		// -----------------------------------
		//  Create the spiral pattern
		// -----------------------------------
		$theta		= 1;
		$thetac		= 7;
		$radius		= 16;
		$circles	= 20;
		$points		= 32;

		for ($i = 0, $cp = ($circles * $points) - 1; $i < $cp; $i++)
		{
			$theta += $thetac;
			$rad = $radius * ($i / $points);
			$x = ($rad * cos($theta)) + $x_axis;
			$y = ($rad * sin($theta)) + $y_axis;
			$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 -= $thetac;
		}

		// -----------------------------------
		//  Write the text
		// -----------------------------------

		$use_font = ($font_path !== '' && file_exists($font_path) && function_exists('imagettftext'));
		if ($use_font === FALSE)
		{
			$font_size = 5;
			$x = rand(0, $img_width / ($length / 3));
			$y = 0;
		}
		else
		{
			$font_size = 16;
			$x = rand(0, $img_width / ($length / 1.5));
			$y = $font_size + 2;
		}

		for ($i = 0; $i < $length; $i++)
		{
			if ($use_font === FALSE)
			{
				$y = rand(0 , $img_height / 2);
				imagestring($im, $font_size, $x, $y, $word[$i], $text_color);
				$x += ($font_size * 2);
			}
			else
			{
				$y = rand($img_height / 2, $img_height - 3);
				imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, $word[$i]);
				$x += $font_size;
			}
		}

		// Create the border
		imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $border_color);

		// -----------------------------------
		//  Generate the image
		// -----------------------------------
		$img_name = $now.'.jpg';
		ImageJPEG($im, $img_path.$img_name);
		$img = '<img src="'.$img_url.$img_name.'" style="width: '.$img_width.'; height: '.$img_height .'; border: 0;" alt=" " />';
		ImageDestroy($im);

		return array('word' => $word, 'time' => $now, 'image' => $img);
	}
}

/* End of file captcha_helper.php */
/* Location: ./system/helpers/captcha_helper.php */