wikimedia / mediawiki

		// Make sure the system configuration allows log in / sign up

		if ( !$this->isSignup() && !$authManager->canAuthenticateNow() ) {

			if ( !$session->canSetUser() ) {

				throw new ErrorPageError( 'cannotloginnow-title', 'cannotloginnow-text', [

					$session->getProvider()->describe( RequestContext::getMain()->getLanguage() )

				] );

			}

			throw new ErrorPageError( 'cannotlogin-title', 'cannotlogin-text' );

		} elseif ( $this->isSignup() && !$authManager->canCreateAccounts() ) {

			throw new ErrorPageError( 'cannotcreateaccount-title', 'cannotcreateaccount-text' );

		// Make sure it's possible to log out

		$session = MediaWiki\Session\SessionManager::getGlobalSession();

		if ( !$session->canSetUser() ) {

			throw new ErrorPageError(

				'cannotlogoutnow-title',

				'cannotlogoutnow-text',

				[

					$session->getProvider()->describe( RequestContext::getMain()->getLanguage() )

				]

			);

		}

		$user = $this->getUser();

		$oldName = $user->getName();