import v1.1.0_beta1 | 2009-08-21
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libs/Auth/OpenID/MemcachedStore.php
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208
libs/Auth/OpenID/MemcachedStore.php
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<?php
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/**
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* This file supplies a memcached store backend for OpenID servers and
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* consumers.
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*
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* PHP versions 4 and 5
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*
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* LICENSE: See the COPYING file included in this distribution.
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*
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* @package OpenID
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* @author Artemy Tregubenko <me@arty.name>
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* @copyright 2008 JanRain, Inc.
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache
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* Contributed by Open Web Technologies <http://openwebtech.ru/>
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*/
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/**
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* Import the interface for creating a new store class.
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*/
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require_once 'Auth/OpenID/Interface.php';
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/**
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* This is a memcached-based store for OpenID associations and
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* nonces.
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*
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* As memcache has limit of 250 chars for key length,
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* server_url, handle and salt are hashed with sha1().
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*
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* Most of the methods of this class are implementation details.
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* People wishing to just use this store need only pay attention to
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* the constructor.
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*
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* @package OpenID
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*/
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class Auth_OpenID_MemcachedStore extends Auth_OpenID_OpenIDStore {
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/**
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* Initializes a new {@link Auth_OpenID_MemcachedStore} instance.
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* Just saves memcached object as property.
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*
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* @param resource connection Memcache connection resourse
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*/
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function Auth_OpenID_MemcachedStore($connection, $compress = false)
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{
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$this->connection = $connection;
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$this->compress = $compress ? MEMCACHE_COMPRESSED : 0;
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}
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/**
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* Store association until its expiration time in memcached.
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* Overwrites any existing association with same server_url and
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* handle. Handles list of associations for every server.
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*/
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function storeAssociation($server_url, $association)
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{
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// create memcached keys for association itself
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// and list of associations for this server
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$associationKey = $this->associationKey($server_url,
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$association->handle);
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$serverKey = $this->associationServerKey($server_url);
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// get list of associations
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$serverAssociations = $this->connection->get($serverKey);
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// if no such list, initialize it with empty array
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if (!$serverAssociations) {
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$serverAssociations = array();
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}
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// and store given association key in it
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$serverAssociations[$association->issued] = $associationKey;
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// save associations' keys list
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$this->connection->set(
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$serverKey,
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$serverAssociations,
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$this->compress
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);
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// save association itself
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$this->connection->set(
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$associationKey,
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$association,
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$this->compress,
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$association->issued + $association->lifetime);
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}
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/**
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* Read association from memcached. If no handle given
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* and multiple associations found, returns latest issued
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*/
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function getAssociation($server_url, $handle = null)
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{
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// simple case: handle given
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if ($handle !== null) {
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// get association, return null if failed
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$association = $this->connection->get(
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$this->associationKey($server_url, $handle));
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return $association ? $association : null;
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}
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// no handle given, working with list
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// create key for list of associations
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$serverKey = $this->associationServerKey($server_url);
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// get list of associations
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$serverAssociations = $this->connection->get($serverKey);
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// return null if failed or got empty list
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if (!$serverAssociations) {
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return null;
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}
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// get key of most recently issued association
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$keys = array_keys($serverAssociations);
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sort($keys);
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$lastKey = $serverAssociations[array_pop($keys)];
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// get association, return null if failed
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$association = $this->connection->get($lastKey);
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return $association ? $association : null;
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}
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/**
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* Immediately delete association from memcache.
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*/
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function removeAssociation($server_url, $handle)
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{
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// create memcached keys for association itself
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// and list of associations for this server
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$serverKey = $this->associationServerKey($server_url);
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$associationKey = $this->associationKey($server_url,
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$handle);
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// get list of associations
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$serverAssociations = $this->connection->get($serverKey);
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// return null if failed or got empty list
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if (!$serverAssociations) {
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return false;
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}
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// ensure that given association key exists in list
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$serverAssociations = array_flip($serverAssociations);
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if (!array_key_exists($associationKey, $serverAssociations)) {
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return false;
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}
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// remove given association key from list
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unset($serverAssociations[$associationKey]);
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$serverAssociations = array_flip($serverAssociations);
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// save updated list
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$this->connection->set(
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$serverKey,
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$serverAssociations,
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$this->compress
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);
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// delete association
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return $this->connection->delete($associationKey);
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}
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/**
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* Create nonce for server and salt, expiring after
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* $Auth_OpenID_SKEW seconds.
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*/
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function useNonce($server_url, $timestamp, $salt)
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{
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global $Auth_OpenID_SKEW;
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// save one request to memcache when nonce obviously expired
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if (abs($timestamp - time()) > $Auth_OpenID_SKEW) {
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return false;
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}
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// returns false when nonce already exists
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// otherwise adds nonce
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return $this->connection->add(
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'openid_nonce_' . sha1($server_url) . '_' . sha1($salt),
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1, // any value here
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$this->compress,
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$Auth_OpenID_SKEW);
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}
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/**
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* Memcache key is prefixed with 'openid_association_' string.
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*/
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function associationKey($server_url, $handle = null)
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{
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return 'openid_association_' . sha1($server_url) . '_' . sha1($handle);
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}
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/**
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* Memcache key is prefixed with 'openid_association_' string.
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*/
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function associationServerKey($server_url)
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{
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return 'openid_association_server_' . sha1($server_url);
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}
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/**
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* Report that this storage doesn't support cleanup
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*/
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function supportsCleanup()
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{
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return false;
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}
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}
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?>
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