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<?php
/**
* This class provides a class with behaviour similar to the $_SESSION variable.
* Data is automatically saved on exit.
*
* Care should be taken when using this class to store objects. It will not detect changes to objects
* automatically. Instead, a call to set(...) should be done to notify this class of changes.
*
* @author Olav Morken, UNINETT AS.
* @package simpleSAMLphp
* @deprecated This class will be removed in version 1.8 of simpleSAMLphp.
*/
class SimpleSAML_MemcacheStore {
/**
* This variable contains an array with all key-value pairs stored
* in this object.
*/
private $data = NULL;
/**
* This function is used to find an existing storage object. It will return NULL if no storage object
* with the given id is found.
*
* @param $id The id of the storage object we are looking for. A id consists of lowercase
* alphanumeric characters.
* @return The corresponding MemcacheStorage object if the data is found or NULL if it isn't found.
*/
public static function find($id) {
assert(self::isValidID($id));
$serializedData = SimpleSAML_Memcache::get($id);
if($serializedData === NULL) {
return NULL;
}
$data = unserialize($serializedData);
if(!($data instanceof self)) {
SimpleSAML_Logger::warning('Retrieved key from memcache did not contain a MemcacheStore object.');
return NULL;
}
return $data;
}
/**
* This function retrieves the specified key from this storage object.
*
* @param $key The key we should retrieve the value of.
* @return The value of the specified key, or NULL of the key wasn't found.
*/
public function get($key) {
if(!array_key_exists($key, $this->data)) {
return NULL;
}
return $this->data[$key];
}
/**
* This function determines whether the argument is a valid id.
* A valid id is a string containing lowercase alphanumeric
* characters.
*
* @param $id The id we should validate.
* @return TRUE if the id is valid, FALSE otherwise.
*/
private static function isValidID($id) {
if(!is_string($id)) {
return FALSE;
}
if(strlen($id) < 1) {
return FALSE;
}
if(preg_match('/[^0-9a-z]/', $id)) {
return FALSE;
}
return TRUE;
}
}
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