forked from friendica/friendica-addons
278 lines
9.8 KiB
PHP
278 lines
9.8 KiB
PHP
<?php
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/**
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* Abstract Calendaring backend. Extend this class to create your own backends.
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*
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* @package Sabre
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* @subpackage CalDAV
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* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
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* @author Evert Pot (http://www.rooftopsolutions.nl/)
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* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
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*/
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abstract class Sabre_CalDAV_Backend_Abstract {
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/**
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* Returns a list of calendars for a principal.
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*
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* Every project is an array with the following keys:
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* * id, a unique id that will be used by other functions to modify the
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* calendar. This can be the same as the uri or a database key.
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* * uri, which the basename of the uri with which the calendar is
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* accessed.
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* * principaluri. The owner of the calendar. Almost always the same as
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* principalUri passed to this method.
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*
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* Furthermore it can contain webdav properties in clark notation. A very
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* common one is '{DAV:}displayname'.
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*
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* @param string $principalUri
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* @return array
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*/
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abstract function getCalendarsForUser($principalUri);
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/**
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* Creates a new calendar for a principal.
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*
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* If the creation was a success, an id must be returned that can be used to reference
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* this calendar in other methods, such as updateCalendar.
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*
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* @param string $principalUri
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* @param string $calendarUri
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* @param array $properties
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* @return void
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*/
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abstract function createCalendar($principalUri,$calendarUri,array $properties);
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/**
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* Updates properties for a calendar.
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*
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* The mutations array uses the propertyName in clark-notation as key,
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* and the array value for the property value. In the case a property
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* should be deleted, the property value will be null.
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*
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* This method must be atomic. If one property cannot be changed, the
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* entire operation must fail.
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*
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* If the operation was successful, true can be returned.
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* If the operation failed, false can be returned.
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*
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* Deletion of a non-existent property is always successful.
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*
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* Lastly, it is optional to return detailed information about any
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* failures. In this case an array should be returned with the following
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* structure:
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*
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* array(
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* 403 => array(
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* '{DAV:}displayname' => null,
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* ),
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* 424 => array(
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* '{DAV:}owner' => null,
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* )
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* )
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*
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* In this example it was forbidden to update {DAV:}displayname.
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* (403 Forbidden), which in turn also caused {DAV:}owner to fail
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* (424 Failed Dependency) because the request needs to be atomic.
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*
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* @param mixed $calendarId
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* @param array $mutations
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* @return bool|array
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*/
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public function updateCalendar($calendarId, array $mutations) {
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return false;
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}
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/**
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* Delete a calendar and all it's objects
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*
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* @param mixed $calendarId
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* @return void
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*/
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abstract function deleteCalendar($calendarId);
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/**
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* Returns all calendar objects within a calendar.
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*
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* Every item contains an array with the following keys:
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* * id - unique identifier which will be used for subsequent updates
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* * calendardata - The iCalendar-compatible calendar data
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* * uri - a unique key which will be used to construct the uri. This can be any arbitrary string.
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* * lastmodified - a timestamp of the last modification time
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* * etag - An arbitrary string, surrounded by double-quotes. (e.g.:
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* ' "abcdef"')
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* * calendarid - The calendarid as it was passed to this function.
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* * size - The size of the calendar objects, in bytes.
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*
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* Note that the etag is optional, but it's highly encouraged to return for
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* speed reasons.
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*
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* The calendardata is also optional. If it's not returned
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* 'getCalendarObject' will be called later, which *is* expected to return
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* calendardata.
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*
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* If neither etag or size are specified, the calendardata will be
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* used/fetched to determine these numbers. If both are specified the
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* amount of times this is needed is reduced by a great degree.
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*
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* @param mixed $calendarId
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* @return array
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*/
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abstract function getCalendarObjects($calendarId);
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/**
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* Returns information from a single calendar object, based on it's object
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* uri.
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*
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* The returned array must have the same keys as getCalendarObjects. The
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* 'calendardata' object is required here though, while it's not required
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* for getCalendarObjects.
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*
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* @param mixed $calendarId
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* @param string $objectUri
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* @return array
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*/
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abstract function getCalendarObject($calendarId,$objectUri);
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/**
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* Creates a new calendar object.
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*
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* It is possible return an etag from this function, which will be used in
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* the response to this PUT request. Note that the ETag must be surrounded
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* by double-quotes.
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*
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* However, you should only really return this ETag if you don't mangle the
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* calendar-data. If the result of a subsequent GET to this object is not
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* the exact same as this request body, you should omit the ETag.
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*
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* @param mixed $calendarId
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* @param string $objectUri
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* @param string $calendarData
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* @return string|null
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*/
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abstract function createCalendarObject($calendarId,$objectUri,$calendarData);
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/**
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* Updates an existing calendarobject, based on it's uri.
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*
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* It is possible return an etag from this function, which will be used in
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* the response to this PUT request. Note that the ETag must be surrounded
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* by double-quotes.
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*
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* However, you should only really return this ETag if you don't mangle the
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* calendar-data. If the result of a subsequent GET to this object is not
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* the exact same as this request body, you should omit the ETag.
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*
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* @param mixed $calendarId
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* @param string $objectUri
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* @param string $calendarData
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* @return string|null
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*/
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abstract function updateCalendarObject($calendarId,$objectUri,$calendarData);
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/**
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* Deletes an existing calendar object.
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*
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* @param mixed $calendarId
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* @param string $objectUri
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* @return void
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*/
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abstract function deleteCalendarObject($calendarId,$objectUri);
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/**
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* Performs a calendar-query on the contents of this calendar.
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*
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* The calendar-query is defined in RFC4791 : CalDAV. Using the
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* calendar-query it is possible for a client to request a specific set of
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* object, based on contents of iCalendar properties, date-ranges and
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* iCalendar component types (VTODO, VEVENT).
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*
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* This method should just return a list of (relative) urls that match this
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* query.
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*
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* The list of filters are specified as an array. The exact array is
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* documented by Sabre_CalDAV_CalendarQueryParser.
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*
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* Note that it is extremely likely that getCalendarObject for every path
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* returned from this method will be called almost immediately after. You
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* may want to anticipate this to speed up these requests.
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*
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* This method provides a default implementation, which parses *all* the
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* iCalendar objects in the specified calendar.
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*
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* This default may well be good enough for personal use, and calendars
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* that aren't very large. But if you anticipate high usage, big calendars
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* or high loads, you are strongly adviced to optimize certain paths.
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*
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* The best way to do so is override this method and to optimize
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* specifically for 'common filters'.
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*
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* Requests that are extremely common are:
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* * requests for just VEVENTS
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* * requests for just VTODO
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* * requests with a time-range-filter on either VEVENT or VTODO.
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*
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* ..and combinations of these requests. It may not be worth it to try to
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* handle every possible situation and just rely on the (relatively
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* easy to use) CalendarQueryValidator to handle the rest.
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*
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* Note that especially time-range-filters may be difficult to parse. A
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* time-range filter specified on a VEVENT must for instance also handle
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* recurrence rules correctly.
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* A good example of how to interprete all these filters can also simply
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* be found in Sabre_CalDAV_CalendarQueryFilter. This class is as correct
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* as possible, so it gives you a good idea on what type of stuff you need
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* to think of.
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*
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* @param mixed $calendarId
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* @param array $filters
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* @return array
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*/
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public function calendarQuery($calendarId, array $filters) {
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$result = array();
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$objects = $this->getCalendarObjects($calendarId);
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$validator = new Sabre_CalDAV_CalendarQueryValidator();
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foreach($objects as $object) {
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if ($this->validateFilterForObject($object, $filters)) {
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$result[] = $object['uri'];
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}
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}
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return $result;
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}
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/**
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* This method validates if a filters (as passed to calendarQuery) matches
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* the given object.
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*
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* @param array $object
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* @param array $filter
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* @return bool
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*/
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protected function validateFilterForObject(array $object, array $filters) {
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// Unfortunately, setting the 'calendardata' here is optional. If
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// it was excluded, we actually need another call to get this as
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// well.
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if (!isset($object['calendardata'])) {
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$object = $this->getCalendarObject($object['calendarid'], $object['uri']);
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}
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$vObject = Sabre_VObject_Reader::read($object['calendardata']);
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$validator = new Sabre_CalDAV_CalendarQueryValidator();
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return $validator->validate($vObject, $filters);
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}
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}
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