adodb-session.php

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<?php


/*
V4.80 8 Mar 2006  (c) 2000-2006 John Lim ([e-mail]). All rights reserved.
         Contributed by Ross Smith ([e-mail]). 
  Released under both BSD license and Lesser GPL library license.
  Whenever there is any discrepancy between the two licenses,
  the BSD license will take precedence.
	  Set tabs to 4 for best viewing.
*/

/*
	You may want to rename the 'data' field to 'session_data' as
	'data' appears to be a reserved word for one or more of the following:
		ANSI SQL
		IBM DB2
		MS SQL Server
		Postgres
		SAP

	If you do, then execute:

		ADODB_Session::dataFieldName('session_data');

*/

if (!defined('_ADODB_LAYER')) {
	require_once realpath(dirname(__FILE__) . '/../adodb.inc.php');
}

if (defined('ADODB_SESSION')) return 1;

define('ADODB_SESSION', dirname(__FILE__));


/* 
	Unserialize session data manually. See http://phplens.com/lens/lensforum/msgs.php?id=9821 
	
	From Kerr Schere, to unserialize session data stored via ADOdb. 
	1. Pull the session data from the db and loop through it. 
	2. Inside the loop, you will need to urldecode the data column. 
	3. After urldecode, run the serialized string through this function:

*/
function adodb_unserialize( $serialized_string ) 
{
	$variables = array( );
	$a = preg_split( "/(\w+)\|/", $serialized_string, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE );
	for( $i = 0; $i < count( $a ); $i = $i+2 ) {
		$variables[$a[$i]] = unserialize( $a[$i+1] );
	}
	return( $variables );
}

/*
	Thanks Joe Li. See http://phplens.com/lens/lensforum/msgs.php?id=11487&x=1
	Since adodb 4.61.
*/
function adodb_session_regenerate_id() 
{
	$conn =& ADODB_Session::_conn();
	if (!$conn) return false;

	$old_id = session_id();
	if (function_exists('session_regenerate_id')) {
		session_regenerate_id();
	} else {
		session_id(md5(uniqid(rand(), true)));
		$ck = session_get_cookie_params();
		setcookie(session_name(), session_id(), false, $ck['path'], $ck['domain'], $ck['secure']);
		//@session_start();
	}
	$new_id = session_id();
	$ok =& $conn->Execute('UPDATE '. ADODB_Session::table(). ' SET sesskey='. $conn->qstr($new_id). ' WHERE sesskey='.$conn->qstr($old_id));
	
	/* it is possible that the update statement fails due to a collision */
	if (!$ok) {
		session_id($old_id);
		if (empty($ck)) $ck = session_get_cookie_params();
		setcookie(session_name(), session_id(), false, $ck['path'], $ck['domain'], $ck['secure']);
		return false;
	}
	
	return true;
}

/*
    Generate database table for session data
    @see http://phplens.com/lens/lensforum/msgs.php?id=12280
    @return 0 if failure, 1 if errors, 2 if successful.
	@author Markus Staab http://www.public-4u.de
*/
function adodb_session_create_table($schemaFile=null,$conn = null)
{
    // set default values
    if ($schemaFile===null) $schemaFile = ADODB_SESSION . '/session_schema.xml';
    if ($conn===null) $conn =& ADODB_Session::_conn();

	if (!$conn) return 0;

    $schema = new adoSchema($conn);
    $schema->ParseSchema($schemaFile);
    return $schema->ExecuteSchema();
}

/*!
	\static
*/
class ADODB_Session {
	/////////////////////
	// getter/setter methods
	/////////////////////
	
	/*
	
	function Lock($lock=null)
	{
	static $_lock = false;
	
		if (!is_null($lock)) $_lock = $lock;
		return $lock;
	}
	*/
	/*!
	*/
	function driver($driver = null) {
		static $_driver = 'mysql';
		static $set = false;

		if (!is_null($driver)) {
			$_driver = trim($driver);
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESSION_DRIVER'])) {
				return $GLOBALS['ADODB_SESSION_DRIVER'];
			}
		}

		return $_driver;
	}

	/*!
	*/
	function host($host = null) {
		static $_host = 'localhost';
		static $set = false;

		if (!is_null($host)) {
			$_host = trim($host);
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESSION_CONNECT'])) {
				return $GLOBALS['ADODB_SESSION_CONNECT'];
			}
		}

		return $_host;
	}

	/*!
	*/
	function user($user = null) {
		static $_user = 'root';
		static $set = false;

		if (!is_null($user)) {
			$_user = trim($user);
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESSION_USER'])) {
				return $GLOBALS['ADODB_SESSION_USER'];
			}
		}

		return $_user;
	}

	/*!
	*/
	function password($password = null) {
		static $_password = '';
		static $set = false;

		if (!is_null($password)) {
			$_password = $password;
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESSION_PWD'])) {
				return $GLOBALS['ADODB_SESSION_PWD'];
			}
		}

		return $_password;
	}

	/*!
	*/
	function database($database = null) {
		static $_database = 'xphplens_2';
		static $set = false;

		if (!is_null($database)) {
			$_database = trim($database);
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESSION_DB'])) {
				return $GLOBALS['ADODB_SESSION_DB'];
			}
		}

		return $_database;
	}

	/*!
	*/
	function persist($persist = null) 
	{
		static $_persist = true;

		if (!is_null($persist)) {
			$_persist = trim($persist);
		}

		return $_persist;
	}

	/*!
	*/
	function lifetime($lifetime = null) {
		static $_lifetime;
		static $set = false;

		if (!is_null($lifetime)) {
			$_lifetime = (int) $lifetime;
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESS_LIFE'])) {
				return $GLOBALS['ADODB_SESS_LIFE'];
			}
		}
		if (!$_lifetime) {
			$_lifetime = ini_get('session.gc_maxlifetime');
			if ($_lifetime <= 1) {
				// bug in PHP 4.0.3 pl 1  -- how about other versions?
				//print "<h3>Session Error: PHP.INI setting <i>session.gc_maxlifetime</i>not set: $lifetime</h3>";
				$_lifetime = 1440;
			}
		}

		return $_lifetime;
	}

	/*!
	*/
	function debug($debug = null) {
		static $_debug = false;
		static $set = false;

		if (!is_null($debug)) {
			$_debug = (bool) $debug;

			$conn = ADODB_Session::_conn();
			if ($conn) {
				$conn->debug = $_debug;
			}
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESS_DEBUG'])) {
				return $GLOBALS['ADODB_SESS_DEBUG'];
			}
		}

		return $_debug;
	}

	/*!
	*/
	function expireNotify($expire_notify = null) {
		static $_expire_notify;
		static $set = false;

		if (!is_null($expire_notify)) {
			$_expire_notify = $expire_notify;
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESSION_EXPIRE_NOTIFY'])) {
				return $GLOBALS['ADODB_SESSION_EXPIRE_NOTIFY'];
			}
		}

		return $_expire_notify;
	}

	/*!
	*/
	function table($table = null) {
		static $_table = 'sessions';
		static $set = false;

		if (!is_null($table)) {
			$_table = trim($table);
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESSION_TBL'])) {
				return $GLOBALS['ADODB_SESSION_TBL'];
			}
		}

		return $_table;
	}

	/*!
	*/
	function optimize($optimize = null) {
		static $_optimize = false;
		static $set = false;

		if (!is_null($optimize)) {
			$_optimize = (bool) $optimize;
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (defined('ADODB_SESSION_OPTIMIZE')) {
				return true;
			}
		}

		return $_optimize;
	}

	/*!
	*/
	function syncSeconds($sync_seconds = null) {
		static $_sync_seconds = 60;
		static $set = false;

		if (!is_null($sync_seconds)) {
			$_sync_seconds = (int) $sync_seconds;
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (defined('ADODB_SESSION_SYNCH_SECS')) {
				return ADODB_SESSION_SYNCH_SECS;
			}
		}

		return $_sync_seconds;
	}

	/*!
	*/
	function clob($clob = null) {
		static $_clob = false;
		static $set = false;

		if (!is_null($clob)) {
			$_clob = strtolower(trim($clob));
			$set = true;
		} elseif (!$set) {
			// backwards compatibility
			if (isset($GLOBALS['ADODB_SESSION_USE_LOBS'])) {
				return $GLOBALS['ADODB_SESSION_USE_LOBS'];
			}
		}

		return $_clob;
	}

	/*!
	*/
	function dataFieldName($data_field_name = null) {
		static $_data_field_name = 'data';

		if (!is_null($data_field_name)) {
			$_data_field_name = trim($data_field_name);
		}

		return $_data_field_name;
	}

	/*!
	*/
	function filter($filter = null) {
		static $_filter = array();

		if (!is_null($filter)) {
			if (!is_array($filter)) {
				$filter = array($filter);
			}
			$_filter = $filter;
		}

		return $_filter;
	}

	/*!
	*/
	function encryptionKey($encryption_key = null) {
		static $_encryption_key = 'CRYPTED ADODB SESSIONS ROCK!';

		if (!is_null($encryption_key)) {
			$_encryption_key = $encryption_key;
		}

		return $_encryption_key;
	}

	/////////////////////
	// private methods
	/////////////////////

	/*!
	*/
	function &_conn($conn=null) {
		return $GLOBALS['ADODB_SESS_CONN'];
	}

	/*!
	*/
	function _crc($crc = null) {
		static $_crc = false;

		if (!is_null($crc)) {
			$_crc = $crc;
		}

		return $_crc;
	}

	/*!
	*/
	function _init() {
		session_module_name('user');
		session_set_save_handler(
			array('ADODB_Session', 'open'),
			array('ADODB_Session', 'close'),
			array('ADODB_Session', 'read'),
			array('ADODB_Session', 'write'),
			array('ADODB_Session', 'destroy'),
			array('ADODB_Session', 'gc')
		);
	}


	/*!
	*/
	function _sessionKey() {
		// use this function to create the encryption key for crypted sessions
		// crypt the used key, ADODB_Session::encryptionKey() as key and session_id() as salt