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369 lines
12 KiB
PHP
369 lines
12 KiB
PHP
<?php
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/**
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* CalendarQuery Validator
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*
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* This class is responsible for checking if an iCalendar object matches a set
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* of filters. The main function to do this is 'validate'.
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*
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* This is used to determine which icalendar objects should be returned for a
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* calendar-query REPORT request.
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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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class Sabre_CalDAV_CalendarQueryValidator {
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/**
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* Verify if a list of filters applies to the calendar data object
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*
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* The list of filters must be formatted as parsed by Sabre_CalDAV_CalendarQueryParser
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*
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* @param Sabre_VObject_Component $vObject
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* @param array $filters
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* @return bool
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*/
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public function validate(Sabre_VObject_Component $vObject,array $filters) {
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// The top level object is always a component filter.
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// We'll parse it manually, as it's pretty simple.
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if ($vObject->name !== $filters['name']) {
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return false;
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}
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return
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$this->validateCompFilters($vObject, $filters['comp-filters']) &&
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$this->validatePropFilters($vObject, $filters['prop-filters']);
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}
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/**
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* This method checks the validity of comp-filters.
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*
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* A list of comp-filters needs to be specified. Also the parent of the
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* component we're checking should be specified, not the component to check
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* itself.
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*
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* @param Sabre_VObject_Component $parent
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* @param array $filters
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* @return bool
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*/
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protected function validateCompFilters(Sabre_VObject_Component $parent, array $filters) {
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foreach($filters as $filter) {
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$isDefined = isset($parent->$filter['name']);
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if ($filter['is-not-defined']) {
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if ($isDefined) {
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return false;
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} else {
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continue;
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}
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}
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if (!$isDefined) {
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return false;
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}
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if ($filter['time-range']) {
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foreach($parent->$filter['name'] as $subComponent) {
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if ($this->validateTimeRange($subComponent, $filter['time-range']['start'], $filter['time-range']['end'])) {
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continue 2;
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}
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}
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return false;
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}
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if (!$filter['comp-filters'] && !$filter['prop-filters']) {
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continue;
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}
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// If there are sub-filters, we need to find at least one component
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// for which the subfilters hold true.
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foreach($parent->$filter['name'] as $subComponent) {
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if (
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$this->validateCompFilters($subComponent, $filter['comp-filters']) &&
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$this->validatePropFilters($subComponent, $filter['prop-filters'])) {
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// We had a match, so this comp-filter succeeds
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continue 2;
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}
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}
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// If we got here it means there were sub-comp-filters or
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// sub-prop-filters and there was no match. This means this filter
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// needs to return false.
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return false;
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}
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// If we got here it means we got through all comp-filters alive so the
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// filters were all true.
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return true;
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}
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/**
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* This method checks the validity of prop-filters.
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*
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* A list of prop-filters needs to be specified. Also the parent of the
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* property we're checking should be specified, not the property to check
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* itself.
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*
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* @param Sabre_VObject_Component $parent
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* @param array $filters
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* @return bool
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*/
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protected function validatePropFilters(Sabre_VObject_Component $parent, array $filters) {
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foreach($filters as $filter) {
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$isDefined = isset($parent->$filter['name']);
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if ($filter['is-not-defined']) {
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if ($isDefined) {
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return false;
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} else {
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continue;
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}
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}
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if (!$isDefined) {
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return false;
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}
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if ($filter['time-range']) {
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foreach($parent->$filter['name'] as $subComponent) {
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if ($this->validateTimeRange($subComponent, $filter['time-range']['start'], $filter['time-range']['end'])) {
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continue 2;
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}
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}
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return false;
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}
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if (!$filter['param-filters'] && !$filter['text-match']) {
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continue;
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}
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// If there are sub-filters, we need to find at least one property
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// for which the subfilters hold true.
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foreach($parent->$filter['name'] as $subComponent) {
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if(
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$this->validateParamFilters($subComponent, $filter['param-filters']) &&
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(!$filter['text-match'] || $this->validateTextMatch($subComponent, $filter['text-match']))
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) {
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// We had a match, so this prop-filter succeeds
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continue 2;
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}
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}
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// If we got here it means there were sub-param-filters or
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// text-match filters and there was no match. This means the
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// filter needs to return false.
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return false;
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}
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// If we got here it means we got through all prop-filters alive so the
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// filters were all true.
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return true;
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}
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/**
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* This method checks the validity of param-filters.
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*
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* A list of param-filters needs to be specified. Also the parent of the
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* parameter we're checking should be specified, not the parameter to check
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* itself.
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*
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* @param Sabre_VObject_Property $parent
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* @param array $filters
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* @return bool
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*/
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protected function validateParamFilters(Sabre_VObject_Property $parent, array $filters) {
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foreach($filters as $filter) {
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$isDefined = isset($parent[$filter['name']]);
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if ($filter['is-not-defined']) {
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if ($isDefined) {
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return false;
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} else {
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continue;
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}
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}
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if (!$isDefined) {
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return false;
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}
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if (!$filter['text-match']) {
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continue;
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}
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// If there are sub-filters, we need to find at least one parameter
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// for which the subfilters hold true.
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foreach($parent[$filter['name']] as $subParam) {
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if($this->validateTextMatch($subParam,$filter['text-match'])) {
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// We had a match, so this param-filter succeeds
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continue 2;
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}
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}
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// If we got here it means there was a text-match filter and there
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// were no matches. This means the filter needs to return false.
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return false;
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}
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// If we got here it means we got through all param-filters alive so the
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// filters were all true.
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return true;
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}
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/**
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* This method checks the validity of a text-match.
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*
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* A single text-match should be specified as well as the specific property
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* or parameter we need to validate.
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*
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* @param Sabre_VObject_Node $parent
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* @param array $textMatch
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* @return bool
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*/
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protected function validateTextMatch(Sabre_VObject_Node $parent, array $textMatch) {
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$value = (string)$parent;
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$isMatching = Sabre_DAV_StringUtil::textMatch($value, $textMatch['value'], $textMatch['collation']);
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return ($textMatch['negate-condition'] xor $isMatching);
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}
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/**
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* Validates if a component matches the given time range.
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*
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* This is all based on the rules specified in rfc4791, which are quite
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* complex.
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*
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* @param Sabre_VObject_Node $component
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* @param DateTime $start
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* @param DateTime $end
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* @return bool
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*/
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protected function validateTimeRange(Sabre_VObject_Node $component, $start, $end) {
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if (is_null($start)) {
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$start = new DateTime('1900-01-01');
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}
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if (is_null($end)) {
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$end = new DateTime('3000-01-01');
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}
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switch($component->name) {
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case 'VEVENT' :
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case 'VTODO' :
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case 'VJOURNAL' :
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return $component->isInTimeRange($start, $end);
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case 'VALARM' :
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// If the valarm is wrapped in a recurring event, we need to
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// expand the recursions, and validate each.
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//
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// Our datamodel doesn't easily allow us to do this straight
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// in the VALARM component code, so this is a hack, and an
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// expensive one too.
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if ($component->parent->name === 'VEVENT' && $component->parent->RRULE) {
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// Fire up the iterator!
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$it = new Sabre_VObject_RecurrenceIterator($component->parent->parent, (string)$component->parent->UID);
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while($it->valid()) {
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$expandedEvent = $it->getEventObject();
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// We need to check from these expanded alarms, which
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// one is the first to trigger. Based on this, we can
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// determine if we can 'give up' expanding events.
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$firstAlarm = null;
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foreach($expandedEvent->VALARM as $expandedAlarm) {
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$effectiveTrigger = $expandedAlarm->getEffectiveTriggerTime();
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if ($expandedAlarm->isInTimeRange($start, $end)) {
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return true;
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}
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if ((string)$expandedAlarm->TRIGGER['VALUE'] === 'DATE-TIME') {
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// This is an alarm with a non-relative trigger
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// time, likely created by a buggy client. The
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// implication is that every alarm in this
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// recurring event trigger at the exact same
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// time. It doesn't make sense to traverse
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// further.
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} else {
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// We store the first alarm as a means to
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// figure out when we can stop traversing.
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if (!$firstAlarm || $effectiveTrigger < $firstAlarm) {
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$firstAlarm = $effectiveTrigger;
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}
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}
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}
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if (is_null($firstAlarm)) {
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// No alarm was found.
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//
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// Or technically: No alarm that will change for
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// every instance of the recurrence was found,
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// which means we can assume there was no match.
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return false;
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}
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if ($firstAlarm > $end) {
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return false;
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}
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$it->next();
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}
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return false;
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} else {
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return $component->isInTimeRange($start, $end);
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}
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case 'VFREEBUSY' :
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throw new Sabre_DAV_Exception_NotImplemented('time-range filters are currently not supported on ' . $component->name . ' components');
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case 'COMPLETED' :
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case 'CREATED' :
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case 'DTEND' :
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case 'DTSTAMP' :
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case 'DTSTART' :
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case 'DUE' :
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case 'LAST-MODIFIED' :
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return ($start <= $component->getDateTime() && $end >= $component->getDateTime());
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default :
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throw new Sabre_DAV_Exception_BadRequest('You cannot create a time-range filter on a ' . $component->name . ' component');
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}
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}
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}
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