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<?php
/**
* PostgreSQL Session Handler for PHP (native).
*
* Copyright 2000-2006 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 parameters:<pre>
* 'database' The name of the database.
* 'password' The password associated with 'username'.
* 'protocol' The communication protocol ('tcp', 'unix').
* 'username' The username with which to connect to the database.
*
* Required for some configurations (i.e. 'protocol' = 'tcp'):<pre>
* 'hostspec' The hostname of the database server.
* 'port' The port on which to connect to the database.</pre>
*
* Optional parameters:<pre>
* 'persistent' Use persistent DB connections? (boolean)
* Default: NO
* 'table' The name of the sessiondata table in 'database'.
* Default: 'horde_sessionhandler'</pre>
*
* The table structure for the SessionHandler can be found in
* horde/scripts/sql/horde_sessionhandler.pgsql.sql.
*
* Contributors:<pre>
* 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</pre>
*
* $Horde: framework/SessionHandler/SessionHandler/pgsql.php,v 1.12.10.15 2006/03/23 18:00:17 jan Exp $
*
* @author Jon Parise <jon@csh.rit.edu>
* @since Horde 3.0
* @package Horde_SessionHandler
*/
class SessionHandler_pgsql extends SessionHandler {
/**
* Handle for the current database connection.
*
* @var resource
*/
var $_db;
/**
* Are we connected to the SQL server.
*
* @var boolean
*/
var $_connected = false;
/**
* Close the SessionHandler backend.
*
* @return boolean True on success, false otherwise.
*/
function close()
{
/* Disconnect from database. */
if ($this->_connected) {
$this->_connected = false;
return @pg_close($this->_db);
}
return true;
}
/**
* Read the data for a particular session identifier from the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return string The session data.
*/
function read($id)
{
/* Make sure we have a valid database connection. */
$this->_connect();
@pg_query($this->_db, 'BEGIN;');
$timeout = time() - ini_get('session.gc_maxlifetime');
$query = sprintf('SELECT session_data FROM %s WHERE ' .
'session_id = %s AND session_lastmodified >= %s ' .
'FOR UPDATE;',
$this->_params['table'],
$this->quote($id),
$timeout);
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_pgsql::' .
'read(): query = "%s"', $query),
__FILE__, __LINE__, PEAR_LOG_DEBUG);
$result = @pg_query($this->_db, $query);
$data = pg_fetch_result($result, 0, 'session_data');
pg_free_result($result);
return pack('H*', $data);
}
/**
* Write session data to the SessionHandler backend.
*
* @param string $id The session identifier.
* @param string $session_data The session data.
*
* @return boolean True on success, false otherwise.
*/
function write($id, $session_data)
{
/* Make sure we have a valid database connection. */
$this->_connect();
$timeout = time() - ini_get('session.gc_maxlifetime');
$query = sprintf('SELECT session_data FROM %s WHERE ' .
'session_id = %s AND session_lastmodified >= %s ' .
'FOR UPDATE',
$this->_params['table'],
$this->quote($id),
$timeout);
$result = @pg_query($this->_db, $query);
$rows = pg_num_rows($result);
pg_free_result($result);
if ($rows == 0) {
$query = sprintf('INSERT INTO %s (session_id, ' .
'session_lastmodified, session_data) ' .
'VALUES (%s, %s, %s);',
$this->_params['table'],
$this->quote($id),
time(),
$this->quote(bin2hex($session_data)));
} else {
$query = sprintf('UPDATE %s SET session_lastmodified = %s, ' .
'session_data = %s WHERE session_id = %s;',
$this->_params['table'],
time(),
$this->quote(bin2hex($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__, PEAR_LOG_DEBUG);
$result = @pg_query($this->_db, $query);
if (!$result) {
Horde::logMessage('Error writing session data: ' . pg_last_error($this->_db), __FILE__, __LINE__, PEAR_LOG_ERR);
return false;
}
$rows = pg_affected_rows($result);
pg_free_result($result);
@pg_query($this->_db, 'COMMIT;');
if ($rows != 1) {
Horde::logMessage('Error writing session data',
__FILE__, __LINE__, PEAR_LOG_ERR);
return false;
}
return true;
}
/**
* Destroy the data for a particular session identifier in the
* SessionHandler backend.
*
* @param string $id The session identifier.
*
* @return boolean True on success, false otherwise.
*/
function destroy($id)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('DELETE FROM %s WHERE session_id = %s;',
$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__, PEAR_LOG_DEBUG);
/* Execute the query. */
$result = @pg_query($this->_db, $query);
@pg_query($this->_db, 'COMMIT;');
if (!$result) {
pg_free_result($result);
Horde::logMessage('Failed to delete session (id = ' . $id . ')',
__FILE__, __LINE__, PEAR_LOG_ERR);
return false;
}
pg_free_result($result);
return true;
}
/**
* Garbage collect stale sessions from the SessionHandler backend.
*
* @param integer $maxlifetime The maximum age of a session.
*
* @return boolean True on success, false otherwise.
*/
function gc($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__, PEAR_LOG_DEBUG);
/* Execute the query. */
$result = @pg_query($this->_db, $query);
if (!$result) {
Horde::logMessage('Error garbage collecting old sessions',
__FILE__, __LINE__, PEAR_LOG_ERR);
}
pg_free_result($result);
return $result;
}
/**
* Escape a string for insertion into the database.
* @access private
*
* @param string $value The string to quote.
*
* @return string The quoted string.
*/
function quote($value)
{
return "'" . addslashes($value) . "'";
}
/**
* Get a list of the valid session identifiers.
*
* @return array A list of valid session identifiers.
*/
function getSessionIDs()
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = 'SELECT session_id FROM ' . $this->_params['table'];
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_pgsql::' .
'getSessionIDs(): query = "%s"', $query),
__FILE__, __LINE__, PEAR_LOG_DEBUG);
/* Execute the query. */
$result = @pg_query($this->_db, $query);
if (!$result) {
pg_free_result($result);
Horde::logMessage('Error getting session IDs',
__FILE__, __LINE__, PEAR_LOG_ERR);
return false;
}
$sessions = array();
while ($row = pg_fetch_row($result)) {
$sessions[] = $row[0];
}
pg_free_result($result);
return $sessions;
}
/**
* Attempts to open a connection to the SQL server.
*
* @return boolean True on success; exits (Horde::fatal()) on error.
*/
function _connect()
{
if (!$this->_connected) {
Horde::assertDriverConfig($this->_params, 'sessionhandler',
array('hostspec', 'username', 'database', 'password'),
'session handler pgsql');
if (empty($this->_params['table'])) {
$this->_params['table'] = 'horde_sessionhandler';
}
$connect = empty($this->_params['persistent']) ?
'pg_connect' :'pg_pconnect';
$paramstr = '';
if (isset($this->_params['protocol']) &&
$this->_params['protocol'] == 'tcp') {
$paramstr .= ' host=' . $this->_params['hostspec'];
if (isset($this->_params['port'])) {
$paramstr .= ' port=' . $this->_params['port'];
}
}
$paramstr .= ' dbname=' . $this->_params['database'] .
' user=' . $this->_params['username'] .
' password=' . $this->_params['password'];
if (!$this->_db = @$connect($paramstr)) {
return false;
}
$this->_connected = true;
}
return true;
}
}
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