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
206
207
208
|
<?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 = '')
{
$defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200, 'word_length' => 8, 'pool' => '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');
foreach ($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 (empty($word))
{
$word = '';
for ($i = 0, $mt_rand_max = strlen($pool) - 1; $i < $word_length; $i++)
{
$word .= $pool[mt_rand(0, $mt_rand_max)];
}
}
elseif ( ! is_string($word))
{
$word = (string) $word;
}
// -----------------------------------
// 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 */
|
