1. <?php
2. /***************************************************************
3. *  Copyright notice
4. *
5. *  (c) 2008 Alex Kellner <alexander.kellner@einpraegsam.net>
6. *  All rights reserved
7. *
8. *  This script is part of the TYPO3 project. The TYPO3 project is
9. *  free software; you can redistribute it and/or modify
10. *  it under the terms of the GNU General Public License as published by
11. *  the Free Software Foundation; either version 2 of the License, or
12. *  (at your option) any later version.
13. *
14. *  The GNU General Public License can be found at
15. *  http://www.gnu.org/copyleft/gpl.html.
16. *
17. *  This script is distributed in the hope that it will be useful,
18. *  but WITHOUT ANY WARRANTY; without even the implied warranty of
19. *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20. *  GNU General Public License for more details.
21. *
22. *  This copyright notice MUST APPEAR in all copies of the script!
23. ***************************************************************/
24.  
25. class tx_wtcalculatingcaptcha {
26.  
27.         public $extKey = 'wt_calculating_captcha'; // Extension Key
28.         public $captchaimage = 'EXT:wt_calculating_captcha/captcha.png'; // Path to captcha image
29.        
30.         private $configuration = array();
31.         private $img = '';
32.         private $number1 = '';
33.         private $number2 = '';
34.         private $subfolder = '';
35.        
36.        
37.         /**
38.          * Function generateCaptcha() generate a new captcha image and save the result to the session
39.          *
40.          * @return      string          HTML code for captcha image
41.          */
42.         function generateCaptcha() {
43.                 // config
44.                 $this->conf = $GLOBALS['TSFE']->tmpl->setup['plugin.']['tx_wtcalculatingcaptcha.']; // Typoscript configuration
45.                 $this->subfolder = '';
46.                 if (t3lib_div::getIndpEnv('TYPO3_REQUEST_HOST') . '/' != t3lib_div::getIndpEnv('TYPO3_SITE_URL')) { // if request_host is different to site_url (TYPO3 runs in a subfolder)
47.                     $this->subfolder = str_replace(t3lib_div::getIndpEnv('TYPO3_REQUEST_HOST') . '/', '', t3lib_div::getIndpEnv('TYPO3_SITE_URL')); // get the folder (like "subfolder/")
48.                 }
49.                 $this->startimage = t3lib_div::getIndpEnv('TYPO3_DOCUMENT_ROOT') . '/' . $this->subfolder . $GLOBALS['TSFE']->tmpl->getFileName($this->conf['background.']['image']); // background image
50.                 if ($this->conf['debug']) t3lib_div::debug($this->conf, $this->extKey . ': Typoscript configuration'); // debug output
51.                
52.                 // 1. Get random numbers
53.                 $this->no1 = t3lib_div::trimExplode(',', $this->conf['number1.']['minmax'], 1); // give me the min and the max of number 1
54.                 $this->no2 = t3lib_div::trimExplode(',', $this->conf['number2.']['minmax'], 1); // give me the min and the max of number 2
55.                 $op = mt_rand(0, $this->conf['operation.']['number']); // operator (should be 0 or 1 or 2 or 3)
56.                
57.                 for ($i=0; $i<100; $i++) { // loop max. 100 times
58.                         $this->number1 = mt_rand($this->no1[0], $this->no1[1]); // random number 1
59.                         $this->number2 = mt_rand($this->no2[0], $this->no2[1]); // random number 2
60.                         if ($op != 1 || $this->number1 > $this->number2 || $this->conf['number.']['notNegative'] != 1) break; // stop loop IF operator is not "-" OR if first is greater than second number OR if plugin don't care about negative numbers (function to disable negative numbers)
61.                 }
62.                 switch ($op) { // give me the operator
63.                         case 0:
64.                                 $this->operator = '+'; // operator
65.                                 $this->result = $this->number1 + $this->number2; // result
66.                                 break;
67.                         case 1:
68.                                 $this->operator = '-';
69.                                 $this->result = $this->number1 - $this->number2; // result
70.                                 break;
71.                         case 2:
72.                                 $this->operator = 'x';
73.                                 $this->result = $this->number1 * $this->number2; // result
74.                                 break;
75.                         case 3:
76.                                 $this->operator = ':';
77.                                 $this->result = $this->number1 / $this->number2; // result
78.                                 break;
79.                 }
80.                 $this->content = $this->number1 . ' ' . $this->operator . ' ' . $this->number2;
81.                
82.                 // 2. Save result to session
83.                 $GLOBALS['TSFE']->fe_user->setKey('ses', $this->extKey . '_value', $this->result); // Generate Session with result
84.                 $GLOBALS['TSFE']->storeSessionData(); // Save session
85.                        
86.                 // 3. generate captcha
87.                 if (is_file($this->startimage)) { // if file is correct
88.                        
89.                         $this->configuration['color_rgb'] = sscanf($this->conf['font.']['color'], '#%2x%2x%2x'); // change HEX color to RGB
90.                         $this->img = ImageCreateFromPNG($this->startimage); // Backgroundimage
91.                         $this->configuration['color'] = ImageColorAllocate($this->img, $this->configuration['color_rgb'][0], $this->configuration['color_rgb'][1], $this->configuration['color_rgb'][2]); // Font color
92.                         $this->configuration['font'] = t3lib_div::getIndpEnv('TYPO3_DOCUMENT_ROOT') . '/' . $this->subfolder . $GLOBALS['TSFE']->tmpl->getFileName($this->conf['font.']['path']); // fontfile
93.                         $this->configuration['fontsize'] = $this->conf['font.']['size']; // Fontsize
94.                         $this->configuration['angle'] = t3lib_div::trimExplode(',', $this->conf['font.']['angle'], 1); // give me the angles for the font
95.                         $this->configuration['fontangle'] = mt_rand($this->configuration['angle'][0], $this->configuration['angle'][1]); // random angle
96.                         $this->configuration['distance_hor'] = t3lib_div::trimExplode(',', $this->conf['font.']['distance_hor'], 1); // give me the horizontal distances
97.                         $this->configuration['fontdistance_hor'] = mt_rand($this->configuration['distance_hor'][0], $this->configuration['distance_hor'][1]); // random distance
98.                         $this->configuration['distance_vert'] = t3lib_div::trimExplode(',', $this->conf['font.']['distance_vert'], 1); // give me the vertical distances
99.                         $this->configuration['fontdistance_vert'] = mt_rand($this->configuration['distance_vert'][0], $this->configuration['distance_vert'][1]); // random distance
100.                         if ($this->conf['debug']) t3lib_div::debug($this->configuration, $this->extKey . ': Image configuration'); // debug output
101.                         imagettftext($this->img, $this->configuration['fontsize'], $this->configuration['fontangle'], $this->configuration['fontdistance_hor'], $this->configuration['fontdistance_vert'], $this->configuration['color'], $this->configuration['font'], $this->content); // add text to image
102.                         imagepng($this->img, t3lib_div::getIndpEnv('TYPO3_DOCUMENT_ROOT') . '/' . $this->subfolder . $GLOBALS['TSFE']->tmpl->getFileName($this->captchaimage)); // save image file
103.                         imagedestroy($this->img); // delete temp image
104.                        
105.                 // 4. return
106.                         if ($this->conf['debug']) t3lib_div::debug($this->content, $this->extKey . ': Image content'); // debug output
107.                         if ($this->conf['debug']) t3lib_div::debug($this->result, $this->extKey . ': Result'); // debug output
108.                         return '<img src="' . $GLOBALS['TSFE']->tmpl->getFileName($this->captchaimage) . '?hash=' . time() . '" alt="captcha" class="wtcalculatingcaptcha" id="wtcalculatingcaptcha" />';
109.                
110.                 } else { // Path to the background image is wrong
111.                        
112.                         if (!$this->conf['debug']) return '<strong>wt_calculating_captcha ERROR:</strong> Please check the path to the background image file: "' . $GLOBALS['TSFE']->tmpl->getFileName($this->conf['background.']['image']) . '"';
113.                         else return '<strong>wt_calculating_captcha ERROR:</strong> Path to image is wrong: ' . $this->startimage;
114.                
115.                 }
116.         }
117.        
118.        
119.         /**
120.          * Function correctCode() returns true or false if the given code is right
121.          *
122.          * @param       string          $code: captcha code from input field
123.          * @return      boolean         True/False for correct or incorrect code
124.          */
125.         function correctCode($code) {
126.                 if (!empty($GLOBALS['TSFE']->fe_user->sesData[$this->extKey . '_value'])) { // if there is a value in session
127.                         // config
128.                         $this->conf = $GLOBALS['TSFE']->tmpl->setup['plugin.']['tx_wtcalculatingcaptcha.']; // Typoscript configuration
129.                        
130.                         // let's go
131.                         if (intval($code) == $GLOBALS['TSFE']->fe_user->sesData[$this->extKey . '_value'] && !empty($code)) { // if code is set and equal to session value
132.                                 if ($this->conf['debug']) t3lib_div::debug('Yes, captcha code is correct!', $this->extKey . ': captcha code'); // debug output
133.                                 return true; // correct code
134.                         } else {
135.                                 if ($this->conf['debug']) t3lib_div::debug('No, captcha code is NOT correct!', $this->extKey . ': captcha code'); // debug output
136.                                 return false; // wrong code
137.                         }
138.                 } return false; // false per default
139.         }
140. }
141.  
142.  
143. if (defined('TYPO3_MODE') && $TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['ext/wt_calculating_captcha/class.tx_wtcalculatingcaptcha.php'])    {
144.         include_once($TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['ext/wt_calculating_captcha/class.tx_wtcalculatingcaptcha.php']);
145. }
146.