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<?php |
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namespace Sesshin; |
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use Sesshin\Id; |
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use League\Event\EmitterAwareTrait; |
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use Sesshin\FingerprintGenerator\FingerprintGeneratorInterface; |
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use Sesshin\Store\StoreInterface; |
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class Session implements \ArrayAccess |
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{ |
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use EmitterAwareTrait; |
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const DEFAULT_NAMESPACE = 'default'; |
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const METADATA_NAMESPACE = '__metadata__'; |
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/** @var Id\Handler */ |
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private $idHandler; |
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/** @var int Number of requests after which id is regeneratd */ |
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private $idRequestsLimit = null; |
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/** @var int Time after id is regenerated */ |
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private $idTtl = 1440; |
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/** @var bool */ |
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private $idRegenerated; |
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/** @var int */ |
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private $regenerationTrace; |
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/** @var StoreInterface */ |
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private $store; |
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/** @var bool|mixed Session values */ |
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private $values = array(); |
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/** @var int Specifies the number of seconds after which session will be automatically expired */ |
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private $ttl = 1440; |
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/** @var int First trace (timestamp), time when session was created */ |
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private $firstTrace; |
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/** @var int Last trace (Unix timestamp) */ |
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private $lastTrace; |
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/** @var int */ |
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private $requestsCount; |
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/** @var FingerprintGeneratorInterface[] */ |
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private $fingerprintGenerators = array(); |
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/** @var string */ |
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private $fingerprint = ''; |
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/** @var bool Is session opened? */ |
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private $opened = false; |
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/** @var SessionFlash */ |
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private $flash; |
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/** |
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* @param StoreInterface $store |
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*/ |
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public function __construct(StoreInterface $store) |
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{ |
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$this->store = $store; |
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// registering shutdown function, just in case someone forgets to close session |
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register_shutdown_function(array($this, 'close')); |
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} |
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/** |
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* Creates new session |
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* |
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* It should be called only once at the beginning. If called for existing |
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* session it ovewrites it (clears all values etc). |
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* It can be replaced with {@link self::open()} (called with "true" argument) |
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* |
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* @return bool Session opened? |
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*/ |
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public function create() |
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{ |
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$this->getIdHandler()->generateId(); |
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$this->values = array(); |
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$this->firstTrace = time(); |
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$this->updateLastTrace(); |
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$this->requestsCount = 1; |
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$this->regenerationTrace = time(); |
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$this->fingerprint = $this->generateFingerprint(); |
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$this->opened = true; |
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return $this->opened; |
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} |
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/** |
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* Opens the session (for a given request) |
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* |
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* If session hasn't been created earlier with {@link self::create()} method then: |
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* - if argument is set to true, session will be created implicitly (behaves |
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* like PHP's native session_start()), |
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* - otherwise, session won't be created and apprporiate listeners will be notified. |
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* |
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* If called earlier, then second (and next ones) call does nothing |
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* |
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* @param bool $createNewIfNotExists Create new session if not exists earlier? |
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* @return bool Session opened? |
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*/ |
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public function open($createNewIfNotExists = false) |
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{ |
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if (!$this->isOpened()) { |
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if ($this->getIdHandler()->issetId()) { |
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$this->load(); |
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if (!$this->getFirstTrace()) { |
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$this->getEmitter()->emit(new Event\NoDataOrExpired($this)); |
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} elseif ($this->isExpired()) { |
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$this->getEmitter()->emit(new Event\Expired($this)); |
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} elseif ($this->generateFingerprint() != $this->getFingerprint()) { |
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$this->getEmitter()->emit(new Event\InvalidFingerprint($this)); |
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} else { |
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$this->opened = true; |
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$this->requestsCount += 1; |
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} |
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} elseif ($createNewIfNotExists) { |
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$this->create(); |
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} |
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} |
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return $this->opened; |
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} |
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/** |
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* Is session opened? |
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* |
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* @return bool |
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*/ |
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public function isOpened() |
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{ |
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return $this->opened; |
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} |
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/** |
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* Alias of {@link self::isOpened()}. |
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* |
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* @return bool |
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*/ |
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public function isOpen() |
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{ |
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return $this->isOpened(); |
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} |
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/** |
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* Is session expired? |
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* |
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* @return bool |
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*/ |
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public function isExpired() |
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{ |
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return ($this->getLastTrace() + $this->getTtl() < time()); |
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} |
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/** |
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* Close the session. |
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*/ |
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public function close() |
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{ |
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if ($this->opened) { |
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if ($this->shouldRegenerateId()) { |
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$this->regenerateId(); |
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} |
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$this->updateLastTrace(); |
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$this->save(); |
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$this->values = array(); |
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$this->opened = false; |
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} |
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} |
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/** |
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* Destroy the session. |
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*/ |
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public function destroy() |
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{ |
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$this->values = array(); |
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$this->getStore()->delete($this->getId()); |
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$this->getIdHandler()->unsetId(); |
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} |
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/** |
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* Get session identifier |
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* |
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* @return string |
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*/ |
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public function getId() |
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{ |
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return $this->getIdHandler()->getId(); |
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} |
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/** |
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* Regenerates session id. |
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* |
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* Destroys current session in store and generates new id, which will be saved |
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* at the end of script execution (together with values). |
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* |
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* Id is regenerated at the most once per script execution (even if called a few times). |
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* |
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* Mitigates Session Fixation - use it whenever the user's privilege level changes. |
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*/ |
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public function regenerateId() |
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{ |
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if (! $this->idRegenerated) { |
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$this->getStore()->delete($this->getId()); |
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$this->getIdHandler()->generateId(); |
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$this->regenerationTrace = time(); |
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$this->idRegenerated = true; |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @param Id\Handler $idHandler |
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*/ |
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public function setIdHandler(Id\Handler $idHandler) |
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{ |
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$this->idHandler = $idHandler; |
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} |
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/** |
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* @return Id\Handler |
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*/ |
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public function getIdHandler() |
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{ |
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if (! $this->idHandler) { |
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$this->idHandler = new Id\Handler(); |
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} |
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return $this->idHandler; |
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} |
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/** |
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* @param int $limit |
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*/ |
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public function setIdRequestsLimit($limit) |
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{ |
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$this->idRequestsLimit = $limit; |
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} |
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/** |
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* @param int $ttl |
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*/ |
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public function setIdTtl($ttl) |
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{ |
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$this->idTtl = $ttl; |
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} |
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/** |
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* Determine if session id should be regenerated? (based on request_counter or regenerationTrace) |
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*/ |
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protected function shouldRegenerateId() |
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{ |
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if (($this->idRequestsLimit) && ($this->requestsCount >= $this->idRequestsLimit)) { |
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return true; |
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} |
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if (($this->idTtl && $this->regenerationTrace) && ($this->regenerationTrace + $this->idTtl < time())) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @return StoreInterface |
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*/ |
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protected function getStore() |
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{ |
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return $this->store; |
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} |
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/** |
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* @param FingerprintGeneratorInterface $fingerprintGenerator |
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*/ |
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public function addFingerprintGenerator(FingerprintGeneratorInterface $fingerprintGenerator) |
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{ |
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$this->fingerprintGenerators[] = $fingerprintGenerator; |
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} |
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/** |
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* @return string |
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*/ |
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protected function generateFingerprint() |
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{ |
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$fingerprint = ''; |
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foreach ($this->fingerprintGenerators as $fingerprintGenerator) { |
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$fingerprint .= $fingerprintGenerator->generate(); |
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} |
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return $fingerprint; |
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} |
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/** |
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* @return string |
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*/ |
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public function getFingerprint() |
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{ |
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return $this->fingerprint; |
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} |
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/** |
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* Gets first trace timestamp. |
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* |
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* @return int |
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*/ |
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public function getFirstTrace() |
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{ |
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return $this->firstTrace; |
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} |
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/** |
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* Updates last trace timestamp. |
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*/ |
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protected function updateLastTrace() |
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{ |
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$this->lastTrace = time(); |
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} |
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338
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/** |
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* Gets last trace timestamp. |
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* |
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* @return int |
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*/ |
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public function getLastTrace() |
344
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{ |
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return $this->lastTrace; |
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} |
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348
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/** |
349
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* Gets last (id) regeneration timestamp. |
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* |
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* @return int |
352
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*/ |
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public function getRegenerationTrace() |
354
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{ |
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return $this->regenerationTrace; |
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} |
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358
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/** |
359
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* It must be called before {@link self::open()}. |
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* |
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* @param int $ttl |
362
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* @throws Exception |
363
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*/ |
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public function setTtl($ttl) |
365
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{ |
366
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if ($this->isOpened()) { |
367
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throw new Exception('Session is already opened, ttl cannot be set'); |
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} |
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370
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if ($ttl < 1) { |
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throw new Exception('$ttl must be greather than 0'); |
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} |
373
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374
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$this->ttl = (int)$ttl; |
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} |
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377
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/** |
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* @return int |
379
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*/ |
380
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public function getTtl() |
381
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{ |
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return $this->ttl; |
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} |
384
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385
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/** |
386
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* @return int |
387
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*/ |
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public function getRequestsCount() |
389
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{ |
390
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return $this->requestsCount; |
391
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} |
392
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393
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/** |
394
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* Sets session value in given or default namespace |
395
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* |
396
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* @param string $name |
397
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* @param mixed $value |
398
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* @param string $namespace |
399
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*/ |
400
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public function setValue($name, $value, $namespace = self::DEFAULT_NAMESPACE) |
401
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{ |
402
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$this->values[$namespace][$name] = $value; |
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} |
404
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|
405
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/** |
406
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* Gets session value from given or default namespace |
407
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* |
408
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* @param string $name |
409
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* @param string $namespace |
410
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* @return mixed |
411
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*/ |
412
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public function getValue($name, $namespace = self::DEFAULT_NAMESPACE) |
413
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{ |
414
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|
|
return isset($this->values[$namespace][$name]) ? $this->values[$namespace][$name] : null; |
415
|
|
|
} |
416
|
|
|
|
417
|
|
|
/** |
418
|
|
|
* Gets and unsets value (flash value) for given or default namespace |
419
|
|
|
* |
420
|
|
|
* @param string $name |
421
|
|
|
* @param string $namespace |
422
|
|
|
* @return mixed |
423
|
|
|
*/ |
424
|
|
|
public function getUnsetValue($name, $namespace = self::DEFAULT_NAMESPACE) |
425
|
|
|
{ |
426
|
|
|
$value = $this->getValue($name, $namespace); |
427
|
|
|
$this->unsetValue($name, $namespace); |
428
|
|
|
|
429
|
|
|
return $value; |
430
|
|
|
} |
431
|
|
|
|
432
|
|
|
/** |
433
|
|
|
* Get all values for given or default namespace |
434
|
|
|
* |
435
|
|
|
* @param string $namespace |
436
|
|
|
* @return array |
437
|
|
|
*/ |
438
|
|
|
public function getValues($namespace = self::DEFAULT_NAMESPACE) |
439
|
|
|
{ |
440
|
|
|
return (isset($this->values[$namespace]) ? $this->values[$namespace] : array()); |
441
|
|
|
} |
442
|
|
|
|
443
|
|
|
/** |
444
|
|
|
* @param string $name |
445
|
|
|
* @param string $namespace |
446
|
|
|
* @return bool |
447
|
|
|
*/ |
448
|
|
|
public function issetValue($name, $namespace = self::DEFAULT_NAMESPACE) |
449
|
|
|
{ |
450
|
|
|
return isset($this->values[$namespace][$name]); |
451
|
|
|
} |
452
|
|
|
|
453
|
|
|
/** |
454
|
|
|
* @param string $name |
455
|
|
|
* @param string $namespace |
456
|
|
|
*/ |
457
|
|
|
public function unsetValue($name, $namespace = self::DEFAULT_NAMESPACE) |
458
|
|
|
{ |
459
|
|
|
if (isset($this->values[$namespace][$name])) { |
460
|
|
|
unset($this->values[$namespace][$name]); |
461
|
|
|
} |
462
|
|
|
} |
463
|
|
|
|
464
|
|
|
/** |
465
|
|
|
* @param string $namespace |
466
|
|
|
*/ |
467
|
|
|
public function unsetValues($namespace = self::DEFAULT_NAMESPACE) |
468
|
|
|
{ |
469
|
|
|
if (isset($this->values[$namespace])) { |
470
|
|
|
unset($this->values[$namespace]); |
471
|
|
|
} |
472
|
|
|
} |
473
|
|
|
|
474
|
|
|
/** |
475
|
|
|
* @param mixed $offset |
476
|
|
|
* @param mixed $value |
477
|
|
|
*/ |
478
|
|
|
public function offsetSet($offset, $value) |
479
|
|
|
{ |
480
|
|
|
$this->setValue($offset, $value); |
481
|
|
|
} |
482
|
|
|
|
483
|
|
|
/** |
484
|
|
|
* @param mixed $offset |
485
|
|
|
* @return mixed |
486
|
|
|
*/ |
487
|
|
|
public function offsetGet($offset) |
488
|
|
|
{ |
489
|
|
|
return $this->getValue($offset); |
490
|
|
|
} |
491
|
|
|
|
492
|
|
|
/** |
493
|
|
|
* @param mixed $offset |
494
|
|
|
* @return bool |
495
|
|
|
*/ |
496
|
|
|
public function offsetExists($offset) |
497
|
|
|
{ |
498
|
|
|
return $this->issetValue($offset); |
499
|
|
|
} |
500
|
|
|
|
501
|
|
|
/** |
502
|
|
|
* @param mixed $offset |
503
|
|
|
*/ |
504
|
|
|
public function offsetUnset($offset) |
505
|
|
|
{ |
506
|
|
|
$this->unsetValue($offset); |
507
|
|
|
} |
508
|
|
|
|
509
|
|
|
/** |
510
|
|
|
* Loads session data from defined store. |
511
|
|
|
* |
512
|
|
|
* @return bool |
513
|
|
|
*/ |
514
|
|
|
protected function load() |
515
|
|
|
{ |
516
|
|
|
$id = $this->getId(); |
517
|
|
|
$values = $this->getStore()->fetch($id); |
518
|
|
|
|
519
|
|
|
if ($values === false) { |
520
|
|
|
return false; |
521
|
|
|
} |
522
|
|
|
|
523
|
|
|
// metadata |
524
|
|
|
$metadata = $values[self::METADATA_NAMESPACE]; |
525
|
|
|
$this->firstTrace = $metadata['firstTrace']; |
526
|
|
|
$this->lastTrace = $metadata['lastTrace']; |
527
|
|
|
$this->regenerationTrace = $metadata['regenerationTrace']; |
528
|
|
|
$this->requestsCount = $metadata['requestsCount']; |
529
|
|
|
$this->fingerprint = $metadata['fingerprint']; |
530
|
|
|
|
531
|
|
|
// values |
532
|
|
|
$this->values = $values; |
533
|
|
|
|
534
|
|
|
return true; |
535
|
|
|
} |
536
|
|
|
|
537
|
|
|
/** |
538
|
|
|
* Saves session data into defined store. |
539
|
|
|
* |
540
|
|
|
* @return bool |
541
|
|
|
*/ |
542
|
|
|
protected function save() |
543
|
|
|
{ |
544
|
|
|
$this->flash()->ageFlashData(); |
545
|
|
|
|
546
|
|
|
$values = $this->values; |
547
|
|
|
|
548
|
|
|
$values[self::METADATA_NAMESPACE] = [ |
549
|
|
|
'firstTrace' => $this->getFirstTrace(), |
550
|
|
|
'lastTrace' => $this->getLastTrace(), |
551
|
|
|
'regenerationTrace' => $this->getRegenerationTrace(), |
552
|
|
|
'requestsCount' => $this->getRequestsCount(), |
553
|
|
|
'fingerprint' => $this->getFingerprint(), |
554
|
|
|
]; |
555
|
|
|
|
556
|
|
|
return $this->getStore()->save($this->getId(), $values, $this->ttl); |
557
|
|
|
} |
558
|
|
|
|
559
|
|
|
/** |
560
|
|
|
* Put a key / value pair or array of key / value pairs in the session. |
561
|
|
|
* |
562
|
|
|
* @param string|array $key |
563
|
|
|
* @param mixed $value |
564
|
|
|
* @return void |
565
|
|
|
*/ |
566
|
|
|
public function put($key, $value = null) |
567
|
|
|
{ |
568
|
|
|
if (! is_array($key)) { |
569
|
|
|
$key = [$key => $value]; |
570
|
|
|
} |
571
|
|
|
|
572
|
|
|
foreach ($key as $arrayKey => $arrayValue) { |
573
|
|
|
$this->setValue($arrayKey, $arrayValue); |
574
|
|
|
} |
575
|
|
|
} |
576
|
|
|
|
577
|
|
|
|
578
|
|
|
/** |
579
|
|
|
* Push a value onto a session array. |
580
|
|
|
* |
581
|
|
|
* @param string $key |
582
|
|
|
* @param mixed $value |
583
|
|
|
* @return void |
584
|
|
|
*/ |
585
|
|
|
public function push($key, $value) |
586
|
|
|
{ |
587
|
|
|
$array = $this->getValue($key); |
588
|
|
|
$array[] = $value; |
589
|
|
|
$this->setValue($key, $array); |
590
|
|
|
} |
591
|
|
|
|
592
|
|
|
/** |
593
|
|
|
* Remove one or many items from the session. |
594
|
|
|
* |
595
|
|
|
* @param string|array $keys |
596
|
|
|
* @return void |
597
|
|
|
*/ |
598
|
|
|
public function forget($keys) |
599
|
|
|
{ |
600
|
|
|
$remove = $keys; |
601
|
|
|
|
602
|
|
|
foreach($remove as $key){ |
|
|
|
|
603
|
|
|
$this->unsetValue($key); |
604
|
|
|
} |
605
|
|
|
|
606
|
|
|
} |
607
|
|
|
|
608
|
|
|
|
609
|
|
|
/** |
610
|
|
|
* Call the flash session handler. |
611
|
|
|
* |
612
|
|
|
* @return SessionFlash |
613
|
|
|
*/ |
614
|
|
|
public function flash() |
615
|
|
|
{ |
616
|
|
|
if (is_null($this->flash)) { |
617
|
|
|
|
618
|
|
|
$this->flash = new SessionFlash($this); |
619
|
|
|
|
620
|
|
|
return $this->flash; |
621
|
|
|
|
622
|
|
|
} else { |
623
|
|
|
return $this->flash; |
624
|
|
|
} |
625
|
|
|
} |
626
|
|
|
} |
627
|
|
|
|
There are different options of fixing this problem.
If you want to be on the safe side, you can add an additional type-check:
If you are sure that the expression is traversable, you might want to add a doc comment cast to improve IDE auto-completion and static analysis:
Mark the issue as a false-positive: Just hover the remove button, in the top-right corner of this issue for more options.