Service.php
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	<?php

	namespace Nasqueron\SAAS\MediaWiki;

	use Nasqueron\SAAS\InstanceNotFoundException;
	use Nasqueron\SAAS\SaaSException;
	use Nasqueron\SAAS\Service as BaseService;
	use Nasqueron\SAAS\MediaWiki\Configuration\Instances;

	use Exception;

	class Service extends BaseService {

	/**
	* @var string
	*/
	private $host;

	/**
	* @var string
	*/
	private $canonicalHost = "";

	/**
	* @var Configuration
	*/
	private $configuration = null;

	/**
	* @var Service
	*/
	private static $service = null;

	public function __construct (string $host = '') {
	$this->host = $host ?: self::getServerHost();
	}

	/**
	* @return Service
	*/
	public static function preload() {
	if (self::$service === null) {

	self::$service = new self;
	try {
	self::$service
	->handleAliveRequest()
	->handleNotExistingSite();
	} catch (SaaSException $exception) {
	self::$service->serveNotAvailableResponse();
	}
	}

	return self::$service;

	}

	public function getHost () : string {
	return $this->host;
	}

	public function run () : void {
	$this->decorateHeaders();
	}

	public function isExisting () : bool {
	try {
	Instances::getDatabaseFromHost($this->host);
	} catch (InstanceNotFoundException $exception) {
	return false;
	}

	return true;
	}

	private function decorateHeaders () : void {
	header("SaaS-Host: " . $this->host);
	header("SaaS-Canonical-Host: " . $this->getCanonicalHost());
	header("SaaS-App: MediaWiki");
	}

	public function serveNotExistingResponse() : void {
	header("HTTP/1.0 404 Not Found");

	require __DIR__ . '/../views/404.php';
	die;
	}

	public function serveNotAvailableResponse() : void {
	header("HTTP/1.0 503 Service Unavailable");

	require __DIR__ . '/../views/503.php';
	die;
	}

	public static function serveInternalErrorResponse(Exception $exception) : void {
	header("HTTP/1.0 500 Internal Error");

	require __DIR__ . '/../views/500.php';
	die;
	}

	public function getEntryPoint() : string {
	return $_ENV['MEDIAWIKI_ENTRY_POINT'];
	}

	public function getConfiguration() : Configuration {
	if ($this->configuration === null) {
	$this->configuration = new Configuration($this->getCanonicalHost());
	}

	return $this->configuration;
	}

	public function getCanonicalHost () : string {
	if ($this->canonicalHost === "") {
	$this->canonicalHost = Instances::getCanonicalHost($this->getHost());
	}

	return $this->canonicalHost;
	}

	}

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