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82 lines
2.7 KiB
PHP
82 lines
2.7 KiB
PHP
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<?php
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namespace Sabre\CalDAV\Backend;
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/**
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* WebDAV-sync support for CalDAV backends.
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*
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* In order for backends to advertise support for WebDAV-sync, this interface
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* must be implemented.
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*
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* Implementing this can result in a significant reduction of bandwidth and CPU
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* time.
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*
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* For this to work, you _must_ return a {http://sabredav.org/ns}sync-token
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* property from getCalendarsFromUser.
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*
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* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
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* @author Evert Pot (http://evertpot.com/)
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* @license http://sabre.io/license/ Modified BSD License
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*/
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interface SyncSupport extends BackendInterface {
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/**
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* The getChanges method returns all the changes that have happened, since
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* the specified syncToken in the specified calendar.
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*
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* This function should return an array, such as the following:
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*
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* [
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* 'syncToken' => 'The current synctoken',
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* 'added' => [
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* 'new.txt',
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* ],
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* 'modified' => [
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* 'modified.txt',
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* ],
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* 'deleted' => [
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* 'foo.php.bak',
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* 'old.txt'
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* ]
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* );
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*
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* The returned syncToken property should reflect the *current* syncToken
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* of the calendar, as reported in the {http://sabredav.org/ns}sync-token
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* property This is * needed here too, to ensure the operation is atomic.
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*
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* If the $syncToken argument is specified as null, this is an initial
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* sync, and all members should be reported.
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*
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* The modified property is an array of nodenames that have changed since
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* the last token.
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*
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* The deleted property is an array with nodenames, that have been deleted
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* from collection.
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*
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* The $syncLevel argument is basically the 'depth' of the report. If it's
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* 1, you only have to report changes that happened only directly in
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* immediate descendants. If it's 2, it should also include changes from
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* the nodes below the child collections. (grandchildren)
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*
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* The $limit argument allows a client to specify how many results should
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* be returned at most. If the limit is not specified, it should be treated
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* as infinite.
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*
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* If the limit (infinite or not) is higher than you're willing to return,
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* you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
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*
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* If the syncToken is expired (due to data cleanup) or unknown, you must
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* return null.
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*
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* The limit is 'suggestive'. You are free to ignore it.
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*
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* @param string $calendarId
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* @param string $syncToken
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* @param int $syncLevel
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* @param int $limit
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* @return array
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*/
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function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null);
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}
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