Apache.php

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<?php
 
namespace Sabre\DAV\Auth\Backend;
 
use Sabre\HTTP\RequestInterface;
use Sabre\HTTP\ResponseInterface;
 
class Apache implements BackendInterface {
 
    protected $principalPrefix = 'principals/';
 
    function check(RequestInterface $request, ResponseInterface $response) {
 
        $remoteUser = $request->getRawServerValue('REMOTE_USER');
        if (is_null($remoteUser)) {
            $remoteUser = $request->getRawServerValue('REDIRECT_REMOTE_USER');
        }
        if (is_null($remoteUser)) {
            return [false, 'No REMOTE_USER property was found in the PHP $_SERVER super-global. This likely means your server is not configured correctly'];
        }
 
        return [true, $this->principalPrefix . $remoteUser];
 
    }
 
    function challenge(RequestInterface $request, ResponseInterface $response) {
 
    }
 
}