SpecialUnlinkAccounts.php

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<?php
 
use MediaWiki\Auth\AuthenticationResponse;
use MediaWiki\Auth\AuthManager;
use MediaWiki\Session\SessionManager;
 
class SpecialUnlinkAccounts extends AuthManagerSpecialPage {
    protected static $allowedActions = [ AuthManager::ACTION_UNLINK ];
 
    public function __construct() {
        parent::__construct( 'UnlinkAccounts' );
    }
 
    protected function getLoginSecurityLevel() {
        return 'UnlinkAccount';
    }
 
    protected function getDefaultAction( $subPage ) {
        return AuthManager::ACTION_UNLINK;
    }
 
    protected function getGroupName() {
        return 'users';
    }
 
    public function isListed() {
        return AuthManager::singleton()->canLinkAccounts();
    }
 
    protected function getRequestBlacklist() {
        return $this->getConfig()->get( 'RemoveCredentialsBlacklist' );
    }
 
    public function execute( $subPage ) {
        $this->setHeaders();
        $this->loadAuth( $subPage );
 
        if ( !$this->isActionAllowed( $this->authAction ) ) {
            if ( $this->authAction === AuthManager::ACTION_UNLINK ) {
                // Looks like there are no linked accounts to unlink
                $titleMessage = $this->msg( 'cannotunlink-no-provider-title' );
                $errorMessage = $this->msg( 'cannotunlink-no-provider' );
                throw new ErrorPageError( $titleMessage, $errorMessage );
            } else {
                // user probably back-button-navigated into an auth session that no longer exists
                // FIXME would be nice to show a message
                $this->getOutput()->redirect( $this->getPageTitle()->getFullURL( '', false, PROTO_HTTPS ) );
                return;
            }
        }
 
        $this->outputHeader();
 
        $status = $this->trySubmit();
 
        if ( $status === false || !$status->isOK() ) {
            $this->displayForm( $status );
            return;
        }
 
        $response = $status->getValue();
 
        if ( $response->status === AuthenticationResponse::FAIL ) {
            $this->displayForm( StatusValue::newFatal( $response->message ) );
            return;
        }
 
        $status = StatusValue::newGood();
        $status->warning( $this->msg( 'unlinkaccounts-success' ) );
        $this->loadAuth( $subPage, null, true ); // update requests so the unlinked one doesn't show up
 
        // Reset sessions - if the user unlinked an account because it was compromised,
        // log attackers out from sessions obtained via that account.
        $session = $this->getRequest()->getSession();
        $user = $this->getUser();
        SessionManager::singleton()->invalidateSessionsForUser( $user );
        $session->setUser( $user );
        $session->resetId();
 
        $this->displayForm( $status );
    }
 
    public function handleFormSubmit( $data ) {
        // unlink requests do not accept user input so repeat parent code but skip call to
        // AuthenticationRequest::loadRequestsFromSubmission
        $response = $this->performAuthenticationStep( $this->authAction, $this->authRequests );
        return Status::newGood( $response );
    }
}