1: <?php
 2: /**
 3:  * Magento
 4:  *
 5:  * NOTICE OF LICENSE
 6:  *
 7:  * This source file is subject to the Open Software License (OSL 3.0)
 8:  * that is bundled with this package in the file LICENSE.txt.
 9:  * It is also available through the world-wide-web at this URL:
10:  * http://opensource.org/licenses/osl-3.0.php
11:  * If you did not receive a copy of the license and are unable to
12:  * obtain it through the world-wide-web, please send an email
13:  * to license@magentocommerce.com so we can send you a copy immediately.
14:  *
15:  * DISCLAIMER
16:  *
17:  * Do not edit or add to this file if you wish to upgrade Magento to newer
18:  * versions in the future. If you wish to customize Magento for your
19:  * needs please refer to http://www.magentocommerce.com for more information.
20:  *
21:  * @category    Mage
22:  * @package     Mage_Install
23:  * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
24:  * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
25:  */
26: 
27: 
28: /**
29:  * Abstract installer model
30:  *
31:  * @category   Mage
32:  * @package    Mage_Install
33:  * @author     Magento Core Team <core@magentocommerce.com>
34:  */
35: class Mage_Install_Model_Installer_Abstract
36: {
37:     /**
38:      * Installer singleton
39:      *
40:      * @var Mage_Install_Model_Installer
41:      */
42:     protected $_installer;
43: 
44:     /**
45:      * Get installer singleton
46:      *
47:      * @return Mage_Install_Model_Installer
48:      */
49:     protected function _getInstaller()
50:     {
51:         if (is_null($this->_installer)) {
52:             $this->_installer = Mage::getSingleton('install/installer');
53:         }
54:         return $this->_installer;
55:     }
56: 
57:     /**
58:      * Validate session storage value (files or db)
59:      * If empty, will return 'files'
60:      *
61:      * @param string $value
62:      * @return string
63:      * @throws Exception
64:      */
65:     protected function _checkSessionSave($value)
66:     {
67:         if (empty($value)) {
68:             return 'files';
69:         }
70:         if (!in_array($value, array('files', 'db'), true)) {
71:             throw new Exception('session_save value must be "files" or "db".');
72:         }
73:         return $value;
74:     }
75: 
76:     /**
77:      * Validate admin frontname value.
78:      * If empty, "admin" will be returned
79:      *
80:      * @param string $value
81:      * @return string
82:      * @throws Exception
83:      */
84:     protected function _checkAdminFrontname($value)
85:     {
86:         if (empty($value)) {
87:             return 'admin';
88:         }
89:         if (!preg_match('/^[a-z]+[a-z0-9_]+$/i', $value)) {
90:             throw new Exception('admin_frontname value must contain only letters (a-z or A-Z), numbers (0-9) or underscore(_), first character should be a letter.');
91:         }
92:         return $value;
93:     }
94: }
95: