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<?php
/**
* This file supplies a memcached store backend for OpenID servers and
* consumers.
*
* PHP versions 4 and 5
*
* LICENSE: See the COPYING file included in this distribution.
*
* @package OpenID
* @author Artemy Tregubenko <me@arty.name>
* @copyright 2008 JanRain, Inc.
* @license http://www.apache.org/licenses/LICENSE-2.0 Apache
* Contributed by Open Web Technologies <http://openwebtech.ru/>
*/
/**
* Import the interface for creating a new store class.
*/
require_once 'Auth/OpenID/Interface.php';
/**
* This is a memcached-based store for OpenID associations and
* nonces.
*
* As memcache has limit of 250 chars for key length,
* server_url, handle and salt are hashed with sha1().
*
* Most of the methods of this class are implementation details.
* People wishing to just use this store need only pay attention to
* the constructor.
*
* @package OpenID
*/
class Auth_OpenID_MemcachedStore extends Auth_OpenID_OpenIDStore {
/**
* Initializes a new {@link Auth_OpenID_MemcachedStore} instance.
* Just saves memcached object as property.
*
* @param resource connection Memcache connection resourse
*/
function Auth_OpenID_MemcachedStore($connection, $compress = false)
{
$this->connection = $connection;
$this->compress = $compress ? MEMCACHE_COMPRESSED : 0;
}
/**
* Store association until its expiration time in memcached.
* Overwrites any existing association with same server_url and
* handle. Handles list of associations for every server.
*/
function storeAssociation($server_url, $association)
{
// create memcached keys for association itself
// and list of associations for this server
$associationKey = $this->associationKey($server_url,
$association->handle);
$serverKey = $this->associationServerKey($server_url);
// get list of associations
$serverAssociations = $this->connection->get($serverKey);
// if no such list, initialize it with empty array
if (!$serverAssociations) {
$serverAssociations = array();
}
// and store given association key in it
$serverAssociations[$association->issued] = $associationKey;
// save associations' keys list
$this->connection->set(
$serverKey,
$serverAssociations,
$this->compress
);
// save association itself
$this->connection->set(
$associationKey,
$association,
$this->compress,
$association->issued + $association->lifetime);
}
/**
* Read association from memcached. If no handle given
* and multiple associations found, returns latest issued
*/
function getAssociation($server_url, $handle = null)
{
// simple case: handle given
if ($handle !== null) {
// get association, return null if failed
$association = $this->connection->get(
$this->associationKey($server_url, $handle));
return $association ? $association : null;
}
// no handle given, working with list
// create key for list of associations
$serverKey = $this->associationServerKey($server_url);
// get list of associations
$serverAssociations = $this->connection->get($serverKey);
// return null if failed or got empty list
if (!$serverAssociations) {
return null;
}
// get key of most recently issued association
$keys = array_keys($serverAssociations);
sort($keys);
$lastKey = $serverAssociations[array_pop($keys)];
// get association, return null if failed
$association = $this->connection->get($lastKey);
return $association ? $association : null;
}
/**
* Immediately delete association from memcache.
*/
function removeAssociation($server_url, $handle)
{
// create memcached keys for association itself
// and list of associations for this server
$serverKey = $this->associationServerKey($server_url);
$associationKey = $this->associationKey($server_url,
$handle);
// get list of associations
$serverAssociations = $this->connection->get($serverKey);
// return null if failed or got empty list
if (!$serverAssociations) {
return false;
}
// ensure that given association key exists in list
$serverAssociations = array_flip($serverAssociations);
if (!array_key_exists($associationKey, $serverAssociations)) {
return false;
}
// remove given association key from list
unset($serverAssociations[$associationKey]);
$serverAssociations = array_flip($serverAssociations);
// save updated list
$this->connection->set(
$serverKey,
$serverAssociations,
$this->compress
);
// delete association
return $this->connection->delete($associationKey);
}
/**
* Create nonce for server and salt, expiring after
* $Auth_OpenID_SKEW seconds.
*/
function useNonce($server_url, $timestamp, $salt)
{
global $Auth_OpenID_SKEW;
// save one request to memcache when nonce obviously expired
if (abs($timestamp - time()) > $Auth_OpenID_SKEW) {
return false;
}
// returns false when nonce already exists
// otherwise adds nonce
return $this->connection->add(
'openid_nonce_' . sha1($server_url) . '_' . sha1($salt),
1, // any value here
$this->compress,
$Auth_OpenID_SKEW);
}
/**
* Memcache key is prefixed with 'openid_association_' string.
*/
function associationKey($server_url, $handle = null)
{
return 'openid_association_' . sha1($server_url) . '_' . sha1($handle);
}
/**
* Memcache key is prefixed with 'openid_association_' string.
*/
function associationServerKey($server_url)
{
return 'openid_association_server_' . sha1($server_url);
}
/**
* Report that this storage doesn't support cleanup
*/
function supportsCleanup()
{
return false;
}
}
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