Pimcore\Tool\Authentication::authenticateHttpBasic PHP Method

    public static function authenticateHttpBasic()
    {
        // we're using Sabre\HTTP for basic auth
        $request = \Sabre\HTTP\Sapi::getRequest();
        $response = new \Sabre\HTTP\Response();
        $auth = new \Sabre\HTTP\Auth\Basic(Tool::getHostname(), $request, $response);
        $result = $auth->getCredentials();
        if (is_array($result)) {
            list($username, $password) = $result;
            $user = self::authenticatePlaintext($username, $password);
            if ($user) {
                return $user;
            }
        }
        $auth->requireLogin();
        $response->setBody("Authentication required");
        Logger::error("Authentication Basic (WebDAV) required");
        \Sabre\HTTP\Sapi::sendResponse($response);
        die;
    }

 /**
  * @throws \Zend_Exception
  */
 public function init()
 {
     parent::init();
     // set language
     if (\Zend_Registry::isRegistered("Zend_Locale")) {
         $locale = (string) \Zend_Registry::get("Zend_Locale");
         $this->setLanguage($locale);
     } else {
         if ($this->getParam("language")) {
             $this->setLanguage($this->getParam("language"));
         } else {
             $config = Config::getSystemConfig();
             $this->setLanguage($config->general->language);
             // try to set browser-language (validation if installed is in $this->setLanguage() )
             $this->setLanguage(new \Zend_Locale());
         }
     }
     if (self::$adminInitialized) {
         // this will be executed on every call to this init() method
         try {
             $this->setUser(\Zend_Registry::get("pimcore_admin_user"));
         } catch (\Exception $e) {
             \Logger::emerg("adminInitialized was set to true although there was no user set in the registry -> to be save the process was killed");
             exit;
         }
     } else {
         // the following code is only called once, even when there are some subcalls (eg. with $this->action, ... )
         \Pimcore::getEventManager()->trigger("admin.controller.preInit", $this);
         $this->disableBrowserCache();
         // general definitions
         Model\Document::setHideUnpublished(false);
         Model\Object\AbstractObject::setHideUnpublished(false);
         Model\Object\AbstractObject::setGetInheritedValues(false);
         Model\Object\Localizedfield::setGetFallbackValues(false);
         \Pimcore::setAdminMode();
         // init translations
         self::initTranslations($this);
         // init zend action helpers, we need to leave the prefixed class name here as the plugin loader isn't able to handle namespaces
         \Zend_Controller_Action_HelperBroker::addPrefix('Pimcore_Controller_Action_Helper');
         // this is to make it possible to use the session id as a part of the route (ZF default route) used for external editors, etc.
         if ($this->getParam("pimcore_admin_sid")) {
             $_REQUEST["pimcore_admin_sid"] = $this->getParam("pimcore_admin_sid");
         }
         // authenticate user, first try to authenticate with session information
         $user = Authentication::authenticateSession();
         if ($user instanceof Model\User) {
             $this->setUser($user);
             if ($this->getUser()->getLanguage()) {
                 $this->setLanguage($this->getUser()->getLanguage());
             }
         } else {
             // try to authenticate with http basic auth, but this is only allowed for WebDAV
             if ($this->getParam("module") == "admin" && $this->getParam("controller") == "asset" && $this->getParam("action") == "webdav") {
                 $user = Authentication::authenticateHttpBasic();
                 if ($user instanceof Model\User) {
                     $this->setUser($user);
                     \Zend_Registry::set("pimcore_admin_user", $this->getUser());
                     self::$adminInitialized = true;
                     return;
                 }
             }
         }
         // redirect to the login-page if the user isn't authenticated
         if (!$this->getUser() instanceof Model\User && !($this->getParam("module") == "admin" && $this->getParam("controller") == "login")) {
             // put a detailed message into the debug.log
             \Logger::error("Prevented access to " . $_SERVER["REQUEST_URI"] . " because there is no user in the session!", ["server" => $_SERVER, "get" => $_GET, "post" => $_POST, "session" => $_SESSION, "cookie" => $_COOKIE]);
             // send a auth header for the client (is covered by the ajax object in javascript)
             $this->getResponse()->setHeader("X-Pimcore-Auth", "required");
             // redirect to login page
             $this->redirect("/admin/login");
             // exit the execution -> just to be sure
             exit;
         }
         // we're now authenticated so we can remove the default error handler so that we get just the normal PHP errors
         if ($this->getParam("controller") != "login") {
             $front = \Zend_Controller_Front::getInstance();
             $front->unregisterPlugin("Pimcore\\Controller\\Plugin\\ErrorHandler");
             $front->throwExceptions(true);
             @ini_set("display_errors", "On");
             @ini_set("display_startup_errors", "On");
         }
         \Zend_Registry::set("pimcore_admin_user", $this->getUser());
         self::$adminInitialized = true;
         // usage statistics
         $this->logUsageStatistics();
         \Pimcore::getEventManager()->trigger("admin.controller.postInit", $this);
     }
 }