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<?php
declare(strict_types=1);
namespace Sabre\DAVACL\PrincipalBackend;
/**
* Abstract Principal Backend.
*
* Currently this class has no function. It's here for consistency and so we
* have a non-bc-breaking way to add a default generic implementation to
* functions we may add in the future.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
abstract class AbstractBackend implements BackendInterface
{
/**
* Finds a principal by its URI.
*
* This method may receive any type of uri, but mailto: addresses will be
* the most common.
*
* Implementation of this API is optional. It is currently used by the
* CalDAV system to find principals based on their email addresses. If this
* API is not implemented, some features may not work correctly.
*
* This method must return a relative principal path, or null, if the
* principal was not found or you refuse to find it.
*
* @param string $uri
* @param string $principalPrefix
*
* @return string|null
*/
public function findByUri($uri, $principalPrefix)
{
// Note that the default implementation here is a bit slow and could
// likely be optimized.
if ('mailto:' !== substr($uri, 0, 7)) {
return;
}
$result = $this->searchPrincipals(
$principalPrefix,
['{http://sabredav.org/ns}email-address' => substr($uri, 7)]
);
if ($result) {
return $result[0];
}
}
}
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