126 lines
3.0 KiB
PHP
126 lines
3.0 KiB
PHP
<?php
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/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
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namespace Icinga\Web;
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use Icinga\Application\Icinga;
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use Icinga\Web\Session\SessionNamespace;
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class Window
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{
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const UNDEFINED = 'undefined';
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/** @var Window */
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protected static $window;
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/** @var string */
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protected $id;
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/** @var string */
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protected $containerId;
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public function __construct($id)
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{
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$parts = explode('_', $id, 2);
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if (isset($parts[1])) {
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$this->id = $parts[0];
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$this->containerId = $id;
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} else {
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$this->id = $id;
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}
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}
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/**
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* Get whether the window's ID is undefined
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*
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* @return bool
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*/
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public function isUndefined()
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{
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return $this->id === self::UNDEFINED;
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}
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/**
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* Get the window's ID
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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->id;
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}
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/**
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* Get the container's ID
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*
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* @return string
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*/
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public function getContainerId()
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{
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return $this->containerId ?: $this->id;
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}
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/**
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* Return a window-aware session by using the given prefix
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*
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* @param string $prefix The prefix to use
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* @param bool $reset Whether to reset any existing session-data
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*
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* @return SessionNamespace
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*/
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public function getSessionNamespace($prefix, $reset = false)
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{
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$session = Session::getSession();
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$identifier = $prefix . '_' . $this->getId();
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if ($reset && $session->hasNamespace($identifier)) {
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$session->removeNamespace($identifier);
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}
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$namespace = $session->getNamespace($identifier);
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$nsUndef = $prefix . '_' . self::UNDEFINED;
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if (! $reset && ! $this->isUndefined() && $session->hasNamespace($nsUndef)) {
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// We may not have any window-id on the very first request. Now we add
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// all values from the namespace, that has been created in this case,
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// to the new one and remove it afterwards.
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foreach ($session->getNamespace($nsUndef) as $name => $value) {
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$namespace->set($name, $value);
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}
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$session->removeNamespace($nsUndef);
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}
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return $namespace;
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}
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/**
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* Generate a random string
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*
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* @return string
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*/
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public static function generateId()
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{
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$letters = 'abcefghijklmnopqrstuvwxyz';
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return substr(str_shuffle($letters), 0, 12);
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}
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/**
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* @return Window
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*/
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public static function getInstance()
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{
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if (! isset(static::$window)) {
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$id = Icinga::app()->getRequest()->getHeader('X-Icinga-WindowId');
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if (empty($id) || $id === static::UNDEFINED) {
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Icinga::app()->getResponse()->setOverrideWindowId();
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$id = static::generateId();
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}
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static::$window = new Window($id);
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}
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return static::$window;
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}
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}
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