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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2011 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Application;

\defined('JPATH_PLATFORM') or die;

use Joomla\Application\AbstractWebApplication;
use Joomla\Application\Web\WebClient;
use Joomla\CMS\Document\Document;
use Joomla\CMS\Factory;
use Joomla\CMS\Input\Input;
use Joomla\CMS\Language\Language;
use Joomla\CMS\Session\Session;
use Joomla\CMS\Uri\Uri;
use Joomla\CMS\User\User;
use Joomla\CMS\Version;
use Joomla\Registry\Registry;
use Joomla\Session\SessionEvent;
use Psr\Http\Message\ResponseInterface;

/**
 * Base class for a Joomla! Web application.
 *
 * @since  2.5.0
 */
abstract class WebApplication extends AbstractWebApplication
{
	use EventAware, IdentityAware;

/**
	 * The application document object.
	 *
	 * @var    Document
	 * @since  1.7.3
	 */
	protected $document;

/**
	 * The application language object.
	 *
	 * @var    Language
	 * @since  1.7.3
	 */
	protected $language;

/**
	 * The application instance.
	 *
	 * @var    static
	 * @since  1.7.3
	 */
	protected static $instance;

/**
	 * Class constructor.
	 *
	 * @param   Input              $input     An optional argument to provide dependency injection for the application's
	 *                                        input object.  If the argument is a JInput object that object will become
	 *                                        the application's input object, otherwise a default input object is created.
	 * @param   Registry           $config    An optional argument to provide dependency injection for the application's
	 *                                        config object.  If the argument is a Registry object that object will become
	 *                                        the application's config object, otherwise a default config object is created.
	 * @param   WebClient          $client    An optional argument to provide dependency injection for the application's
	 *                                        client object.  If the argument is a WebClient object that object will become
	 *                                        the application's client object, otherwise a default client object is created.
	 * @param   ResponseInterface  $response  An optional argument to provide dependency injection for the application's
	 *                                        response object.  If the argument is a ResponseInterface object that object
	 *                                        will become the application's response object, otherwise a default response
	 *                                        object is created.
	 *
	 * @since   1.7.3
	 */
	public function __construct(Input $input = null, Registry $config = null, WebClient $client = null, ResponseInterface $response = null)
	{
		// Ensure we have a CMS Input object otherwise the DI for \Joomla\CMS\Session\Storage\JoomlaStorage fails
		$input = $input ?: new Input;

parent::__construct($input, $config, $client, $response);

// Set the execution datetime and timestamp;
		$this->set('execution.datetime', gmdate('Y-m-d H:i:s'));
		$this->set('execution.timestamp', time());

// Set the system URIs.
		$this->loadSystemUris();
	}

/**
	 * Returns a reference to the global WebApplication object, only creating it if it doesn't already exist.
	 *
	 * This method must be invoked as: $web = WebApplication::getInstance();
	 *
	 * @param   string  $name  The name (optional) of the JApplicationWeb class to instantiate.
	 *
	 * @return  WebApplication
	 *
	 * @since       1.7.3
	 * @throws      \RuntimeException
	 * @deprecated  5.0 Use \Joomla\CMS\Factory::getContainer()->get($name) instead
	 */
	public static function getInstance($name = null)
	{
		// Only create the object if it doesn't exist.
		if (empty(static::$instance))
		{
			if (!is_subclass_of($name, '\\Joomla\\CMS\\Application\\WebApplication'))
			{
				throw new \RuntimeException(sprintf('Unable to load application: %s', $name), 500);
			}

static::$instance = new $name;
		}

return static::$instance;
	}

/**
	 * Execute the application.
	 *
	 * @return  void
	 *
	 * @since   1.7.3
	 */
	public function execute()
	{
		// Trigger the onBeforeExecute event.
		$this->triggerEvent('onBeforeExecute');

// Perform application routines.
		$this->doExecute();

// Trigger the onAfterExecute event.
		$this->triggerEvent('onAfterExecute');

// If we have an application document object, render it.
		if ($this->document instanceof Document)
		{
			// Trigger the onBeforeRender event.
			$this->triggerEvent('onBeforeRender');

// Render the application output.
			$this->render();

// Trigger the onAfterRender event.
			$this->triggerEvent('onAfterRender');
		}

// If gzip compression is enabled in configuration and the server is compliant, compress the output.
		if ($this->get('gzip') && !ini_get('zlib.output_compression') && (ini_get('output_handler') !== 'ob_gzhandler'))
		{
			$this->compress();
		}

// Trigger the onBeforeRespond event.
		$this->triggerEvent('onBeforeRespond');

// Send the application response.
		$this->respond();

// Trigger the onAfterRespond event.
		$this->triggerEvent('onAfterRespond');
	}

/**
	 * Rendering is the process of pushing the document buffers into the template
	 * placeholders, retrieving data from the document and pushing it into
	 * the application response buffer.
	 *
	 * @return  void
	 *
	 * @since   1.7.3
	 */
	protected function render()
	{
		// Setup the document options.
		$options = array(
			'template'         => $this->get('theme'),
			'file'             => $this->get('themeFile', 'index.php'),
			'params'           => $this->get('themeParams'),
			'templateInherits' => $this->get('themeInherits'),
		);

if ($this->get('themes.base'))
		{
			$options['directory'] = $this->get('themes.base');
		}
		// Fall back to constants.
		else
		{
			$options['directory'] = \defined('JPATH_THEMES') ? JPATH_THEMES : (\defined('JPATH_BASE') ? JPATH_BASE : __DIR__) . '/themes';
		}

// Parse the document.
		$this->document->parse($options);

// Render the document.
		$data = $this->document->render($this->get('cache_enabled'), $options);

// Set the application output data.
		$this->setBody($data);
	}

/**
	 * Method to get the application document object.
	 *
	 * @return  Document  The document object
	 *
	 * @since   1.7.3
	 */
	public function getDocument()
	{
		return $this->document;
	}

/**
	 * Method to get the application language object.
	 *
	 * @return  Language  The language object
	 *
	 * @since   1.7.3
	 */
	public function getLanguage()
	{
		return $this->language;
	}

/**
	 * Flush the media version to refresh versionable assets
	 *
	 * @return  void
	 *
	 * @since   3.2
	 */
	public function flushAssets()
	{
		(new Version)->refreshMediaVersion();
	}

/**
	 * Allows the application to load a custom or default document.
	 *
	 * The logic and options for creating this object are adequately generic for default cases
	 * but for many applications it will make sense to override this method and create a document,
	 * if required, based on more specific needs.
	 *
	 * @param   Document  $document  An optional document object. If omitted, the factory document is created.
	 *
	 * @return  WebApplication This method is chainable.
	 *
	 * @since   1.7.3
	 */
	public function loadDocument(Document $document = null)
	{
		$this->document = $document ?? Factory::getDocument();

return $this;
	}

/**
	 * Allows the application to load a custom or default language.
	 *
	 * The logic and options for creating this object are adequately generic for default cases
	 * but for many applications it will make sense to override this method and create a language,
	 * if required, based on more specific needs.
	 *
	 * @param   Language  $language  An optional language object. If omitted, the factory language is created.
	 *
	 * @return  WebApplication This method is chainable.
	 *
	 * @since   1.7.3
	 */
	public function loadLanguage(Language $language = null)
	{
		$this->language = $language ?? Factory::getLanguage();

return $this;
	}

/**
	 * Allows the application to load a custom or default session.
	 *
	 * The logic and options for creating this object are adequately generic for default cases
	 * but for many applications it will make sense to override this method and create a session,
	 * if required, based on more specific needs.
	 *
	 * @param   Session  $session  An optional session object. If omitted, the session is created.
	 *
	 * @return  WebApplication This method is chainable.
	 *
	 * @since   1.7.3
	 * @deprecated  5.0  The session should be injected as a service.
	 */
	public function loadSession(Session $session = null)
	{
		$this->getLogger()->warning(__METHOD__ . '() is deprecated.  Inject the session as a service instead.', array('category' => 'deprecated'));

return $this;
	}

/**
	 * After the session has been started we need to populate it with some default values.
	 *
	 * @param   SessionEvent  $event  Session event being triggered
	 *
	 * @return  void
	 *
	 * @since   3.0.1
	 */
	public function afterSessionStart(SessionEvent $event)
	{
		$session = $event->getSession();

if ($session->isNew())
		{
			$session->set('registry', new Registry);
			$session->set('user', new User);
		}

// Ensure the identity is loaded
		if (!$this->getIdentity())
		{
			$this->loadIdentity($session->get('user'));
		}
	}

/**
	 * Method to load the system URI strings for the application.
	 *
	 * @param   string  $requestUri  An optional request URI to use instead of detecting one from the
	 *                               server environment variables.
	 *
	 * @return  void
	 *
	 * @since   1.7.3
	 */
	protected function loadSystemUris($requestUri = null)
	{
		// Set the request URI.
		if (!empty($requestUri))
		{
			$this->set('uri.request', $requestUri);
		}
		else
		{
			$this->set('uri.request', $this->detectRequestUri());
		}

// Check to see if an explicit base URI has been set.
		$siteUri = trim($this->get('site_uri'));

if ($siteUri != '')
		{
			$uri = Uri::getInstance($siteUri);
			$path = $uri->toString(array('path'));
		}
		// No explicit base URI was set so we need to detect it.
		else
		{
			// Start with the requested URI.
			$uri = Uri::getInstance($this->get('uri.request'));

// If we are working from a CGI SAPI with the 'cgi.fix_pathinfo' directive disabled we use PHP_SELF.
			if (strpos(PHP_SAPI, 'cgi') !== false && !ini_get('cgi.fix_pathinfo') && !empty($_SERVER['REQUEST_URI']))
			{
				// We aren't expecting PATH_INFO within PHP_SELF so this should work.
				$path = \dirname($_SERVER['PHP_SELF']);
			}
			// Pretty much everything else should be handled with SCRIPT_NAME.
			else
			{
				$path = \dirname($_SERVER['SCRIPT_NAME']);
			}
		}

$host = $uri->toString(array('scheme', 'user', 'pass', 'host', 'port'));

// Check if the path includes "index.php".
		if (strpos($path, 'index.php') !== false)
		{
			// Remove the index.php portion of the path.
			$path = substr_replace($path, '', strpos($path, 'index.php'), 9);
		}

$path = rtrim($path, '/\\');

// Set the base URI both as just a path and as the full URI.
		$this->set('uri.base.full', $host . $path . '/');
		$this->set('uri.base.host', $host);
		$this->set('uri.base.path', $path . '/');

// Set the extended (non-base) part of the request URI as the route.
		if (stripos($this->get('uri.request'), $this->get('uri.base.full')) === 0)
		{
			$this->set('uri.route', substr_replace($this->get('uri.request'), '', 0, \strlen($this->get('uri.base.full'))));
		}

// Get an explicitly set media URI is present.
		$mediaURI = trim($this->get('media_uri'));

if ($mediaURI)
		{
			if (strpos($mediaURI, '://') !== false)
			{
				$this->set('uri.media.full', $mediaURI);
				$this->set('uri.media.path', $mediaURI);
			}
			else
			{
				// Normalise slashes.
				$mediaURI = trim($mediaURI, '/\\');
				$mediaURI = !empty($mediaURI) ? '/' . $mediaURI . '/' : '/';
				$this->set('uri.media.full', $this->get('uri.base.host') . $mediaURI);
				$this->set('uri.media.path', $mediaURI);
			}
		}
		// No explicit media URI was set, build it dynamically from the base uri.
		else
		{
			$this->set('uri.media.full', $this->get('uri.base.full') . 'media/');
			$this->set('uri.media.path', $this->get('uri.base.path') . 'media/');
		}
	}

/**
	 * Retrieve the application configuration object.
	 *
	 * @return  Registry
	 *
	 * @since   4.0.0
	 */
	public function getConfig()
	{
		return $this->config;
	}
}