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<?php
/**
* PostgreSQL Session Handler for PHP (native).
*
* Copyright 2000-2003 Jon Parise <jon@csh.rit.edu>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Required values for $params:<pre>
* 'hostspec' The hostname of the database server.
* 'protocol' The communication protocol ('tcp', 'unix', etc.).
* 'username' The username with which to connect to the database.
* 'password' The password associated with 'username'.
* 'database' The name of the database.
* 'table' The name of the sessiondata table in 'database'.</pre>
*
* Required for some configurations:
* 'port' The port on which to connect to the database.
*
* Optional parameters:
* 'persistent' Use persistent DB connections? (boolean)
*
* The table structure can be created by the scripts/db/sessionhandler.sql
* script.
*
* Contributors:
* Jason Carlson Return an empty string on failed reads
* pat@pcprogrammer.com Perform update in a single transaction
* Jonathan Crompton Lock row for life of session
*
* $Horde: horde/lib/SessionHandler/pgsql.php,v 1.3.2.3 2003/05/19 17:56:11 slusarz Exp $
*
* @author Jon Parise <jon@csh.rit.edu>
* @version 1.10, 9/11/02
* @since Horde 2.2
* @package horde.session
*/
class SessionHandler_pgsql extends SessionHandler {
/** Hash containing connection parameters. */
var $_params = array();
/** Handle for the current database connection.
@var resource $_db */
var $_db;
/**
* Boolean indicating whether or not we're connected to the SQL
* server. */
var $_connected = false;
/**
* Constructs a new PostgreSQL SessionHandler object.
*
* @param array $params A hash containing connection parameters.
*/
function SessionHandler_pgsql($params = array())
{
$this->_params = $params;
}
function open($save_path, $session_name)
{
/* Connect to database. */
$this->_connect();
}
function close()
{
/* Disconnect from database. */
$this->_disconnect();
}
function read($id)
{
/* Make sure we have a valid database connection. */
$this->_connect();
$expired = time() - ini_get('session.gc_maxlifetime');
$squery = sprintf('BEGIN; SELECT session_data FROM %s WHERE session_id = %s AND session_lastmodified >= %s FOR UPDATE;',
$this->_params['table'], $this->quote($id), $expired);
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_pgsql::read(): query = "%s"', $squery),
__FILE__, __LINE__, LOG_DEBUG);
$result = @pg_exec($this->_db, $squery);
if (pg_numrows($result) < 1) {
pg_freeresult($result);
$iquery = sprintf('INSERT INTO %s VALUES (%s, %s, \'\')',
$this->_params['table'], $this->quote($id), time());
$result = @pg_exec($this->_db, $iquery);
$result = @pg_exec($this->_db, $squery);
}
$data = pg_result($result, 0, 'session_data');
pg_freeresult($result);
return $data;
}
function write($id, $session_data)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('UPDATE %s SET session_lastmodified = %s, session_data = %s WHERE session_id = %s; commit;',
$this->_params['table'],
time(),
$this->quote($session_data),
$this->quote($id));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_pgsql::write(): query = "%s"', $query),
__FILE__, __LINE__, LOG_DEBUG);
$result = @pg_exec($this->_db, $query);
$success = (pg_cmdtuples($result) == 0);
pg_freeresult($result);
if (!$success){
Horde::logMessage('Error writing session data', __FILE__, __LINE__, LOG_ERR);
return false;
}
return true;
}
function destroy($id)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('DELETE FROM %s WHERE session_id = %s; commit;',
$this->_params['table'], $this->quote($id));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_pgsql::destroy(): query = "%s"', $query),
__FILE__, __LINE__, LOG_DEBUG);
/* Execute the query. */
$result = @pg_exec($this->_db, $query);
if (!$result) {
pg_freeresult($result);
Horde::logMessage('Failed to delete session (id = ' . $id . ')', __FILE__, __LINE__, LOG_ERR);
return false;
}
pg_freeresult($result);
return true;
}
function gc($maxlifetime = 300)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('DELETE FROM %s WHERE session_lastmodified < %s',
$this->_params['table'], $this->quote(time() - $maxlifetime));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_pgsql::gc(): query = "%s"', $query),
__FILE__, __LINE__, LOG_DEBUG);
/* Execute the query. */
$result = @pg_exec($this->_db, $query);
if (!$result) {
pg_freeresult($result);
Horde::logMessage('Error garbage collecting old sessions', __FILE__, __LINE__, LOG_ERR);
return false;
}
pg_freeresult($result);
return $result;
}
function quote($value)
{
return "'" . addslashes($value) . "'";
}
/**
* Attempts to open a connection to the SQL server.
*
* @return boolean True on success; exits (Horde::fatal()) on error.
*/
function _connect()
{
if (!$this->_connected) {
if (!is_array($this->_params)) {
Horde::fatal(PEAR::raiseError(_("No configuration information specified for SQL SessionHandler.")), __FILE__, __LINE__);
}
if (!isset($this->_params['hostspec'])) {
Horde::fatal(PEAR::raiseError(_("Required 'hostspec' not specified in SessionHandler configuration.")), __FILE__, __LINE__);
}
if (!isset($this->_params['username'])) {
Horde::fatal(PEAR::raiseError(_("Required 'username' not specified in SessionHandler configuration.")), __FILE__, __LINE__);
}
if (!isset($this->_params['password'])) {
Horde::fatal(PEAR::raiseError(_("Required 'password' not specified in SessionHandler configuration.")), __FILE__, __LINE__);
}
if (!isset($this->_params['database'])) {
Horde::fatal(PEAR::raiseError(_("Required 'database' not specified in SessionHandler configuration.")), __FILE__, __LINE__);
}
if (!array_key_exists('table', $this->_params)) {
$this->_params['table'] = 'horde_sessionhandler';
}
if (empty($this->_params['persistent'])) {
$connect = 'pg_connect';
} else {
$connect = 'pg_pconnect';
}
$params = '';
if (!empty($this->_params['hostspec'])) {
$params .= ' host=' . $this->_params['hostspec'];
}
if (!empty($this->_params['port'])) {
$params .= ' port=' . $this->_params['port'];
}
if (!empty($this->_params['database'])) {
$params .= ' dbname=' . $this->_params['database'];
}
if (!empty($this->_params['username'])) {
$params .= ' user=' . $this->_params['username'];
}
if (!empty($this->_params['password'])) {
$params .= ' password=' . $this->_params['password'];
}
if (!$this->_db = @$connect($params)) {
return false;
}
$this->_connected = true;
}
return true;
}
/**
* Disconnect from the SQL server and clean up the connection.
*
* @return boolean true on success, false on failure.
*/
function _disconnect()
{
if ($this->_connected) {
$this->_connected = false;
return @pg_close($this->_db);
}
return true;
}
}
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