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<?php
declare(strict_types=1);
namespace OCA\DAV\CardDAV\Integration;
use Sabre\CardDAV\IAddressBook;
use Sabre\DAV;
/**
* @since 19.0.0
*/
abstract class ExternalAddressBook implements IAddressBook, DAV\IProperties {
/** @var string */
private const PREFIX = 'app-generated';
/**
* @var string
*
* Double dash is a valid delimiter,
* because it will always split the URIs correctly:
* - our prefix contains only one dash and won't be split
* - appIds are not allowed to contain dashes as per spec:
* > must contain only lowercase ASCII characters and underscore
* - explode has a limit of three, so even if the app-generated
* URI has double dashes, it won't be split
*/
private const DELIMITER = '--';
/** @var string */
private $appId;
/** @var string */
private $uri;
/**
* @param string $appId
* @param string $uri
*/
public function __construct(string $appId, string $uri) {
$this->appId = $appId;
$this->uri = $uri;
}
/**
* @inheritDoc
*/
final public function getName() {
return implode(self::DELIMITER, [
self::PREFIX,
$this->appId,
$this->uri,
]);
}
/**
* @inheritDoc
*/
final public function setName($name) {
throw new DAV\Exception\MethodNotAllowed('Renaming address books is not yet supported');
}
/**
* @inheritDoc
*/
final public function createDirectory($name) {
throw new DAV\Exception\MethodNotAllowed('Creating collections in address book objects is not allowed');
}
/**
* Checks whether the address book uri is app-generated
*
* @param string $uri
*
* @return bool
*/
public static function isAppGeneratedAddressBook(string $uri): bool {
return strpos($uri, self::PREFIX) === 0 && substr_count($uri, self::DELIMITER) >= 2;
}
/**
* Splits an app-generated uri into appId and uri
*
* @param string $uri
*
* @return array
*/
public static function splitAppGeneratedAddressBookUri(string $uri): array {
$array = array_slice(explode(self::DELIMITER, $uri, 3), 1);
// Check the array has expected amount of elements
// and none of them is an empty string
if (\count($array) !== 2 || \in_array('', $array, true)) {
throw new \InvalidArgumentException('Provided address book uri was not app-generated');
}
return $array;
}
/**
* Checks whether a address book name the user wants to create violates
* the reserved name for URIs
*
* @param string $uri
*
* @return bool
*/
public static function doesViolateReservedName(string $uri): bool {
return strpos($uri, self::PREFIX) === 0;
}
}
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