summaryrefslogtreecommitdiffstats
path: root/system/libraries/Session/drivers/Session_native.php
blob: 04c985574bdcc2cdc69ad8262084b3ecd50ff2db (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
206
207
208
209
210
<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine	Dev Team
 * @copyright	Copyright	(c) 2008 - 2010, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version	2.0
 * @filesource
 */


/**
 * Native PHP session management driver
 *
 * This is the driver that uses the native PHP $_SESSION array through the Session driver library.
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Sessions
 * @author		ExpressionEngine Dev Team
 */
class CI_Session_native extends CI_Session_driver {
	/**
	 * Initialize session driver object
	 *
	 * @access	protected
	 * @return	void
	 */
	protected function initialize()
	{
		// Get config parameters
		$config = array();
		$CI =& get_instance();
		$prefs = array(
			'sess_cookie_name',
			'sess_expire_on_close',
			'sess_expiration',
			'sess_match_ip',
			'sess_match_useragent',
			'sess_time_to_update',
			'cookie_prefix',
			'cookie_path',
			'cookie_domain'
		);
		foreach ($prefs as $key)
		{
			$config[$key] = isset($this->_parent->params[$key]) ? $this->_parent->params[$key] :
				$CI->config->item($key);
		}

		// Set session name, if specified
		if ($config['sess_cookie_name'])
		{
			$name = $config['sess_cookie_name'];
			if ($config['cookie_prefix'])
			{
				// Prepend cookie prefix
				$name = $config['cookie_prefix'].$name;
			}
			session_name($name);
		}

		// Set expiration, path, and domain
		$expire = 7200;
		$path = '/';
		$domain = '';
		if ($config['sess_expiration'] !== FALSE)
		{
			// Default to 2 years if expiration is "0"
			$expire = ($config['sess_expiration'] == 0) ? (60*60*24*365*2) : $config['sess_expiration'];
		}
		if ($config['cookie_path'])
		{
			// Use specified path
			$path = $config['cookie_path'];
		}
		if ($config['cookie_domain'])
		{
			// Use specified domain
			$domain = $config['cookie_domain'];
		}
		session_set_cookie_params($config['sess_expire_on_close'] ? 0 : $expire, $path, $domain);

		// Start session
		session_start();

		// Check session expiration, ip, and agent
		$now = time();
		$destroy = FALSE;
		if (isset($_SESSION['last_activity']) && ($_SESSION['last_activity'] + $expire) < $now)
		{
			// Expired - destroy
			$destroy = TRUE;
		}
		else if ($config['sess_match_ip'] == TRUE && isset($_SESSION['ip_address']) &&
		$_SESSION['ip_address'] != $CI->input->ip_address())
		{
			// IP doesn't match - destroy
			$destroy = TRUE;
		}
		else if ($config['sess_match_useragent'] == TRUE && isset($_SESSION['user_agent']) &&
		$_SESSION['user_agent'] != trim(substr($CI->input->user_agent(), 0, 50)))
		{
			// Agent doesn't match - destroy
			$destroy = TRUE;
		}

		// Destroy expired or invalid session
		if ($destroy)
		{
			// Clear old session and start new
			$this->sess_destroy();
			session_start();
		}

		// Check for update time
		if ($config['sess_time_to_update'] && isset($_SESSION['last_activity']) &&
		($_SESSION['last_activity'] + $config['sess_time_to_update']) < $now)
		{
			// Regenerate ID, but don't destroy session
			$this->sess_regenerate(FALSE);
		}

		// Set activity time
		$_SESSION['last_activity'] = $now;

		// Set matching values as required
		if ($config['sess_match_ip'] == TRUE && !isset($_SESSION['ip_address']))
		{
			// Store user IP address
			$_SESSION['ip_address'] = $CI->input->ip_address();
		}
		if ($config['sess_match_useragent'] == TRUE && !isset($_SESSION['user_agent']))
		{
			// Store user agent string
			$_SESSION['user_agent'] = trim(substr($CI->input->user_agent(), 0, 50));
		}

		// Make session ID available
		$_SESSION['session_id'] = session_id();
	}

	/**
	 * Save the session data
	 *
	 * @access	public
	 * @return	void
	 */
	public function sess_save()
	{
		// Nothing to do - changes to $_SESSION are automatically saved
	}

	/**
	 * Destroy the current session
	 *
	 * @access	public
	 * @return	void
	 */
	public function sess_destroy()
	{
		// Cleanup session
		$_SESSION = array();
		$name = session_name();
		if (isset($_COOKIE[$name]))
		{
			// Clear session cookie
			$params = session_get_cookie_params();
			setcookie($name, '', time() - 42000, $params['path'], $params['domain']);
			unset($_COOKIE[$name]);
		}
		session_destroy();
	}

	/**
	 * Regenerate the current session
	 *
	 * Regenerate the session id
	 *
	 * @access	public
	 * @param	boolean	Destroy session data flag (default: FALSE)
	 * @return	void
	 */
	public function sess_regenerate($destroy = FALSE)
	{
		// Just regenerate id, passing destroy flag
		session_regenerate_id($destroy);
		$_SESSION['session_id'] = session_id();
	}

	/**
	 * Get a reference to user data array
	 *
	 * @access	public
	 * @return	array	Reference to userdata
	 */
	public function &get_userdata()
	{
		// Just return reference to $_SESSION
		return $_SESSION;
	}
}

/* End of file Session_native.php */
/* Location: ./system/libraries/Session/drivers/Session_native.php */