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	diff --git a/src/applications/calendar/editor/PhabricatorCalendarEventEditor.php b/src/applications/calendar/editor/PhabricatorCalendarEventEditor.php
	index 655037c140..d22d34bee7 100644
	--- a/src/applications/calendar/editor/PhabricatorCalendarEventEditor.php
	+++ b/src/applications/calendar/editor/PhabricatorCalendarEventEditor.php
	@@ -1,335 +1,332 @@
	<?php

	final class PhabricatorCalendarEventEditor
	extends PhabricatorApplicationTransactionEditor {

	public function getEditorApplicationClass() {
	return 'PhabricatorCalendarApplication';
	}

	public function getEditorObjectsDescription() {
	return pht('Calendar');
	}

	protected function shouldApplyInitialEffects(
	PhabricatorLiskDAO $object,
	array $xactions) {
	return true;
	}

	protected function applyInitialEffects(
	PhabricatorLiskDAO $object,
	array $xactions) {

	$actor = $this->requireActor();
	if ($object->getIsStub()) {
	$this->materializeStub($object);
	}
	}

	private function materializeStub(PhabricatorCalendarEvent $event) {
	if (!$event->getIsStub()) {
	throw new Exception(
	pht('Can not materialize an event stub: this event is not a stub.'));
	}

	$actor = $this->getActor();
	+
	+ $invitees = $event->getInvitees();
	+
	$event->copyFromParent($actor);
	$event->setIsStub(0);

	- $invitees = $event->getParentEvent()->getInvitees();
	-
	- $new_invitees = array();
	- foreach ($invitees as $invitee) {
	- $invitee = id(new PhabricatorCalendarEventInvitee())
	- ->setEventPHID($event->getPHID())
	- ->setInviteePHID($invitee->getInviteePHID())
	- ->setInviterPHID($invitee->getInviterPHID())
	- ->setStatus($invitee->getStatus())
	- ->save();
	-
	- $new_invitees[] = $invitee;
	- }
	+ $event->openTransaction();
	+ $event->save();
	+ foreach ($invitees as $invitee) {
	+ $invitee
	+ ->setEventPHID($event->getPHID())
	+ ->save();
	+ }
	+ $event->saveTransaction();

	- $event->save();
	- $event->attachInvitees($new_invitees);
	+ $event->attachInvitees($invitees);
	}

	public function getTransactionTypes() {
	$types = parent::getTransactionTypes();

	$types[] = PhabricatorTransactions::TYPE_COMMENT;
	$types[] = PhabricatorTransactions::TYPE_VIEW_POLICY;
	$types[] = PhabricatorTransactions::TYPE_EDIT_POLICY;

	return $types;
	}

	protected function adjustObjectForPolicyChecks(
	PhabricatorLiskDAO $object,
	array $xactions) {

	$copy = parent::adjustObjectForPolicyChecks($object, $xactions);
	foreach ($xactions as $xaction) {
	switch ($xaction->getTransactionType()) {
	case PhabricatorCalendarEventHostTransaction::TRANSACTIONTYPE:
	$copy->setHostPHID($xaction->getNewValue());
	break;
	case PhabricatorCalendarEventInviteTransaction::TRANSACTIONTYPE:
	PhabricatorPolicyRule::passTransactionHintToRule(
	$copy,
	new PhabricatorCalendarEventInviteesPolicyRule(),
	array_fuse($xaction->getNewValue()));
	break;
	}
	}

	return $copy;
	}


	protected function applyFinalEffects(
	PhabricatorLiskDAO $object,
	array $xactions) {

	// Clear the availability caches for users whose availability is affected
	// by this edit.

	$invalidate_all = false;
	$invalidate_phids = array();
	foreach ($xactions as $xaction) {
	switch ($xaction->getTransactionType()) {
	case PhabricatorCalendarEventUntilDateTransaction::TRANSACTIONTYPE:
	case PhabricatorCalendarEventStartDateTransaction::TRANSACTIONTYPE:
	case PhabricatorCalendarEventEndDateTransaction::TRANSACTIONTYPE:
	case PhabricatorCalendarEventCancelTransaction::TRANSACTIONTYPE:
	case PhabricatorCalendarEventAllDayTransaction::TRANSACTIONTYPE:
	// For these kinds of changes, we need to invalidate the availabilty
	// caches for all attendees.
	$invalidate_all = true;
	break;
	case PhabricatorCalendarEventAcceptTransaction::TRANSACTIONTYPE:
	case PhabricatorCalendarEventDeclineTransaction::TRANSACTIONTYPE:
	$acting_phid = $this->getActingAsPHID();
	$invalidate_phids[$acting_phid] = $acting_phid;
	break;
	case PhabricatorCalendarEventInviteTransaction::TRANSACTIONTYPE:
	foreach ($xaction->getNewValue() as $phid => $ignored) {
	$invalidate_phids[$phid] = $phid;
	}
	break;
	}
	}

	$phids = mpull($object->getInvitees(), 'getInviteePHID');
	$phids = array_fuse($phids);

	if (!$invalidate_all) {
	$phids = array_select_keys($phids, $invalidate_phids);
	}

	if ($phids) {
	$object->applyViewerTimezone($this->getActor());

	$user = new PhabricatorUser();
	$conn_w = $user->establishConnection('w');
	queryfx(
	$conn_w,
	'UPDATE %T SET availabilityCacheTTL = NULL
	WHERE phid IN (%Ls) AND availabilityCacheTTL >= %d',
	$user->getTableName(),
	$phids,
	$object->getStartDateTimeEpochForCache());
	}

	return $xactions;
	}


	protected function validateAllTransactions(
	PhabricatorLiskDAO $object,
	array $xactions) {

	$start_date_xaction =
	PhabricatorCalendarEventStartDateTransaction::TRANSACTIONTYPE;
	$end_date_xaction =
	PhabricatorCalendarEventEndDateTransaction::TRANSACTIONTYPE;
	$is_recurrence_xaction =
	PhabricatorCalendarEventRecurringTransaction::TRANSACTIONTYPE;
	$recurrence_end_xaction =
	PhabricatorCalendarEventUntilDateTransaction::TRANSACTIONTYPE;

	$start_date = $object->getStartDateTimeEpoch();
	$end_date = $object->getEndDateTimeEpoch();
	$recurrence_end = $object->getUntilDateTimeEpoch();
	$is_recurring = $object->getIsRecurring();

	$errors = array();

	foreach ($xactions as $xaction) {
	if ($xaction->getTransactionType() == $start_date_xaction) {
	$start_date = $xaction->getNewValue()->getEpoch();
	} else if ($xaction->getTransactionType() == $end_date_xaction) {
	$end_date = $xaction->getNewValue()->getEpoch();
	} else if ($xaction->getTransactionType() == $recurrence_end_xaction) {
	$recurrence_end = $xaction->getNewValue()->getEpoch();
	} else if ($xaction->getTransactionType() == $is_recurrence_xaction) {
	$is_recurring = $xaction->getNewValue();
	}
	}

	if ($start_date > $end_date) {
	$errors[] = new PhabricatorApplicationTransactionValidationError(
	$end_date_xaction,
	pht('Invalid'),
	pht('End date must be after start date.'),
	null);
	}

	if ($recurrence_end && !$is_recurring) {
	$errors[] = new PhabricatorApplicationTransactionValidationError(
	$recurrence_end_xaction,
	pht('Invalid'),
	pht('Event must be recurring to have a recurrence end date.').
	null);
	}

	return $errors;
	}

	protected function shouldPublishFeedStory(
	PhabricatorLiskDAO $object,
	array $xactions) {

	if ($object->isImportedEvent()) {
	return false;
	}

	return true;
	}

	protected function supportsSearch() {
	return true;
	}

	protected function shouldSendMail(
	PhabricatorLiskDAO $object,
	array $xactions) {

	if ($object->isImportedEvent()) {
	return false;
	}

	return true;
	}

	protected function getMailSubjectPrefix() {
	return pht('[Calendar]');
	}

	protected function getMailTo(PhabricatorLiskDAO $object) {
	$phids = array();

	if ($object->getHostPHID()) {
	$phids[] = $object->getHostPHID();
	}
	$phids[] = $this->getActingAsPHID();

	$invitees = $object->getInvitees();
	foreach ($invitees as $invitee) {
	$status = $invitee->getStatus();
	if ($status === PhabricatorCalendarEventInvitee::STATUS_ATTENDING
	\|\| $status === PhabricatorCalendarEventInvitee::STATUS_INVITED) {
	$phids[] = $invitee->getInviteePHID();
	}
	}

	$phids = array_unique($phids);

	return $phids;
	}

	public function getMailTagsMap() {
	return array(
	PhabricatorCalendarEventTransaction::MAILTAG_CONTENT =>
	pht(
	"An event's name, status, invite list, ".
	"icon, and description changes."),
	PhabricatorCalendarEventTransaction::MAILTAG_RESCHEDULE =>
	pht(
	"An event's start and end date ".
	"and cancellation status changes."),
	PhabricatorCalendarEventTransaction::MAILTAG_OTHER =>
	pht('Other event activity not listed above occurs.'),
	);
	}

	protected function buildReplyHandler(PhabricatorLiskDAO $object) {
	return id(new PhabricatorCalendarReplyHandler())
	->setMailReceiver($object);
	}

	protected function buildMailTemplate(PhabricatorLiskDAO $object) {
	$id = $object->getID();
	$name = $object->getName();

	return id(new PhabricatorMetaMTAMail())
	->setSubject("E{$id}: {$name}")
	->addHeader('Thread-Topic', "E{$id}: ".$object->getName());
	}

	protected function buildMailBody(
	PhabricatorLiskDAO $object,
	array $xactions) {

	$description = $object->getDescription();
	$body = parent::buildMailBody($object, $xactions);

	if (strlen($description)) {
	$body->addRemarkupSection(
	pht('EVENT DESCRIPTION'),
	$description);
	}

	$body->addLinkSection(
	pht('EVENT DETAIL'),
	PhabricatorEnv::getProductionURI('/E'.$object->getID()));

	$ics_attachment = $this->newICSAttachment($object);
	$body->addAttachment($ics_attachment);

	return $body;
	}

	protected function shouldApplyHeraldRules(
	PhabricatorLiskDAO $object,
	array $xactions) {
	return true;
	}

	protected function buildHeraldAdapter(
	PhabricatorLiskDAO $object,
	array $xactions) {

	return id(new PhabricatorCalendarEventHeraldAdapter())
	->setObject($object);
	}

	private function newICSAttachment(
	PhabricatorCalendarEvent $event) {
	$actor = $this->getActor();

	$ics_data = id(new PhabricatorCalendarICSWriter())
	->setViewer($actor)
	->setEvents(array($event))
	->writeICSDocument();

	$ics_attachment = new PhabricatorMetaMTAAttachment(
	$ics_data,
	$event->getICSFilename(),
	'text/calendar');

	return $ics_attachment;
	}

	}
	diff --git a/src/applications/calendar/storage/PhabricatorCalendarEvent.php b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
	index ce9e28fa17..c5d5c898f9 100644
	--- a/src/applications/calendar/storage/PhabricatorCalendarEvent.php
	+++ b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
	@@ -1,1252 +1,1280 @@
	<?php

	final class PhabricatorCalendarEvent extends PhabricatorCalendarDAO
	implements
	PhabricatorPolicyInterface,
	PhabricatorExtendedPolicyInterface,
	PhabricatorProjectInterface,
	PhabricatorMarkupInterface,
	PhabricatorApplicationTransactionInterface,
	PhabricatorSubscribableInterface,
	PhabricatorTokenReceiverInterface,
	PhabricatorDestructibleInterface,
	PhabricatorMentionableInterface,
	PhabricatorFlaggableInterface,
	PhabricatorSpacesInterface,
	PhabricatorFulltextInterface,
	PhabricatorConduitResultInterface {

	protected $name;
	protected $hostPHID;
	protected $description;
	protected $isCancelled;
	protected $isAllDay;
	protected $icon;
	protected $mailKey;
	protected $isStub;

	protected $isRecurring = 0;

	- private $isGhostEvent = false;
	protected $instanceOfEventPHID;
	protected $sequenceIndex;

	protected $viewPolicy;
	protected $editPolicy;

	protected $spacePHID;

	protected $utcInitialEpoch;
	protected $utcUntilEpoch;
	protected $utcInstanceEpoch;
	protected $parameters = array();

	protected $importAuthorPHID;
	protected $importSourcePHID;
	protected $importUIDIndex;
	protected $importUID;

	private $parentEvent = self::ATTACHABLE;
	private $invitees = self::ATTACHABLE;
	private $importSource = self::ATTACHABLE;

	private $viewerTimezone;

	// TODO: DEPRECATED. Remove once we're sure the migrations worked.
	protected $allDayDateFrom;
	protected $allDayDateTo;
	protected $dateFrom;
	protected $dateTo;
	protected $recurrenceEndDate;
	protected $recurrenceFrequency = array();

	+ private $isGhostEvent = false;
	+ private $stubInvitees;
	+
	public static function initializeNewCalendarEvent(PhabricatorUser $actor) {
	$app = id(new PhabricatorApplicationQuery())
	->setViewer($actor)
	->withClasses(array('PhabricatorCalendarApplication'))
	->executeOne();

	$view_default = PhabricatorCalendarEventDefaultViewCapability::CAPABILITY;
	$edit_default = PhabricatorCalendarEventDefaultEditCapability::CAPABILITY;
	$view_policy = $app->getPolicy($view_default);
	$edit_policy = $app->getPolicy($edit_default);

	$now = PhabricatorTime::getNow();

	$default_icon = 'fa-calendar';

	$datetime_defaults = self::newDefaultEventDateTimes(
	$actor,
	$now);
	list($datetime_start, $datetime_end) = $datetime_defaults;

	return id(new PhabricatorCalendarEvent())
	->setDescription('')
	->setHostPHID($actor->getPHID())
	->setIsCancelled(0)
	->setIsAllDay(0)
	->setIsStub(0)
	->setIsRecurring(0)
	->setIcon($default_icon)
	->setViewPolicy($view_policy)
	->setEditPolicy($edit_policy)
	->setSpacePHID($actor->getDefaultSpacePHID())
	->attachInvitees(array())
	->setDateFrom(0)
	->setDateTo(0)
	->setAllDayDateFrom(0)
	->setAllDayDateTo(0)
	->setStartDateTime($datetime_start)
	->setEndDateTime($datetime_end)
	->attachImportSource(null)
	->applyViewerTimezone($actor);
	}

	public static function newDefaultEventDateTimes(
	PhabricatorUser $viewer,
	$now) {

	$datetime_start = PhutilCalendarAbsoluteDateTime::newFromEpoch(
	$now,
	$viewer->getTimezoneIdentifier());

	// Advance the time by an hour, then round downwards to the nearest hour.
	// For example, if it is currently 3:25 PM, we suggest a default start time
	// of 4 PM.
	$datetime_start = $datetime_start
	->newRelativeDateTime('PT1H')
	->newAbsoluteDateTime();
	$datetime_start->setMinute(0);
	$datetime_start->setSecond(0);

	// Default the end time to an hour after the start time.
	$datetime_end = $datetime_start
	->newRelativeDateTime('PT1H')
	->newAbsoluteDateTime();

	return array($datetime_start, $datetime_end);
	}

	private function newChild(
	PhabricatorUser $actor,
	$sequence,
	PhutilCalendarDateTime $start = null) {
	if (!$this->isParentEvent()) {
	throw new Exception(
	pht(
	'Unable to generate a new child event for an event which is not '.
	'a recurring parent event!'));
	}

	$child = id(new self())
	->setIsCancelled(0)
	->setIsStub(0)
	->setInstanceOfEventPHID($this->getPHID())
	->setSequenceIndex($sequence)
	->setIsRecurring(true)
	->attachParentEvent($this)
	->setAllDayDateFrom(0)
	->setAllDayDateTo(0)
	->setDateFrom(0)
	->setDateTo(0);

	return $child->copyFromParent($actor, $start);
	}

	protected function readField($field) {
	static $inherit = array(
	'hostPHID' => true,
	'isAllDay' => true,
	'icon' => true,
	'spacePHID' => true,
	'viewPolicy' => true,
	'editPolicy' => true,
	'name' => true,
	'description' => true,
	);

	// Read these fields from the parent event instead of this event. For
	// example, we want any changes to the parent event's name to apply to
	// the child.
	if (isset($inherit[$field])) {
	if ($this->getIsStub()) {
	// TODO: This should be unconditional, but the execution order of
	// CalendarEventQuery and applyViewerTimezone() are currently odd.
	if ($this->parentEvent !== self::ATTACHABLE) {
	return $this->getParentEvent()->readField($field);
	}
	}
	}

	return parent::readField($field);
	}


	public function copyFromParent(
	PhabricatorUser $actor,
	PhutilCalendarDateTime $start = null) {

	if (!$this->isChildEvent()) {
	throw new Exception(
	pht(
	'Unable to copy from parent event: this is not a child event.'));
	}

	$parent = $this->getParentEvent();

	$this
	->setHostPHID($parent->getHostPHID())
	->setIsAllDay($parent->getIsAllDay())
	->setIcon($parent->getIcon())
	->setSpacePHID($parent->getSpacePHID())
	->setViewPolicy($parent->getViewPolicy())
	->setEditPolicy($parent->getEditPolicy())
	->setName($parent->getName())
	->setDescription($parent->getDescription());

	if ($start) {
	$start_datetime = $start;
	} else {
	$sequence = $this->getSequenceIndex();
	$start_datetime = $parent->newSequenceIndexDateTime($sequence);

	if (!$start_datetime) {
	throw new Exception(
	pht(
	'Sequence "%s" is not valid for event!',
	$sequence));
	}
	}

	$duration = $parent->newDuration();
	$end_datetime = $start_datetime->newRelativeDateTime($duration);

	$this
	->setStartDateTime($start_datetime)
	->setEndDateTime($end_datetime);

	if ($parent->isImportedEvent()) {
	$full_uid = $parent->getImportUID().'/'.$start_datetime->getEpoch();

	// NOTE: We don't attach the import source because this gets called
	// from CalendarEventQuery while building ghosts, before we've loaded
	// and attached sources. Possibly this sequence should be flipped.

	$this
	->setImportAuthorPHID($parent->getImportAuthorPHID())
	->setImportSourcePHID($parent->getImportSourcePHID())
	->setImportUID($full_uid);
	}

	return $this;
	}

	public function isValidSequenceIndex(PhabricatorUser $viewer, $sequence) {
	return (bool)$this->newSequenceIndexDateTime($sequence);
	}

	public function newSequenceIndexDateTime($sequence) {
	$set = $this->newRecurrenceSet();
	if (!$set) {
	return null;
	}

	$limit = $sequence + 1;
	$count = $this->getRecurrenceCount();
	if ($count && ($count < $limit)) {
	return null;
	}

	$instances = $set->getEventsBetween(
	null,
	$this->newUntilDateTime(),
	$limit);

	return idx($instances, $sequence, null);
	}

	public function newStub(PhabricatorUser $actor, $sequence) {
	$stub = $this->newChild($actor, $sequence);

	$stub->setIsStub(1);

	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	$stub->save();
	unset($unguarded);

	$stub->applyViewerTimezone($actor);

	return $stub;
	}

	public function newGhost(
	PhabricatorUser $actor,
	$sequence,
	PhutilCalendarDateTime $start = null) {

	$ghost = $this->newChild($actor, $sequence, $start);

	$ghost
	->setIsGhostEvent(true)
	->makeEphemeral();

	$ghost->applyViewerTimezone($actor);

	return $ghost;
	}

	public function applyViewerTimezone(PhabricatorUser $viewer) {
	$this->viewerTimezone = $viewer->getTimezoneIdentifier();
	return $this;
	}

	public function getDuration() {
	return ($this->getEndDateTimeEpoch() - $this->getStartDateTimeEpoch());
	}

	public function updateUTCEpochs() {
	// The "intitial" epoch is the start time of the event, in UTC.
	$start_date = $this->newStartDateTime()
	->setViewerTimezone('UTC');
	$start_epoch = $start_date->getEpoch();
	$this->setUTCInitialEpoch($start_epoch);

	// The "until" epoch is the last UTC epoch on which any instance of this
	// event occurs. For infinitely recurring events, it is `null`.

	if (!$this->getIsRecurring()) {
	$end_date = $this->newEndDateTime()
	->setViewerTimezone('UTC');
	$until_epoch = $end_date->getEpoch();
	} else {
	$until_epoch = null;
	$until_date = $this->newUntilDateTime();
	if ($until_date) {
	$until_date->setViewerTimezone('UTC');
	$duration = $this->newDuration();
	$until_epoch = id(new PhutilCalendarRelativeDateTime())
	->setOrigin($until_date)
	->setDuration($duration)
	->getEpoch();
	}
	}
	$this->setUTCUntilEpoch($until_epoch);

	// The "instance" epoch is a property of instances of recurring events.
	// It's the original UTC epoch on which the instance started. Usually that
	// is the same as the start date, but they may be different if the instance
	// has been edited.

	// The ICS format uses this value (original start time) to identify event
	// instances, and must do so because it allows additional arbitrary
	// instances to be added (with "RDATE").

	$instance_epoch = null;
	$instance_date = $this->newInstanceDateTime();
	if ($instance_date) {
	$instance_epoch = $instance_date
	->setViewerTimezone('UTC')
	->getEpoch();
	}
	$this->setUTCInstanceEpoch($instance_epoch);

	return $this;
	}

	public function save() {
	if (!$this->mailKey) {
	$this->mailKey = Filesystem::readRandomCharacters(20);
	}

	$import_uid = $this->getImportUID();
	if ($import_uid !== null) {
	$index = PhabricatorHash::digestForIndex($import_uid);
	} else {
	$index = null;
	}
	$this->setImportUIDIndex($index);

	$this->updateUTCEpochs();

	return parent::save();
	}

	/**
	* Get the event start epoch for evaluating invitee availability.
	*
	* When assessing availability, we pretend events start earlier than they
	* really do. This allows us to mark users away for the entire duration of a
	* series of back-to-back meetings, even if they don't strictly overlap.
	*
	* @return int Event start date for availability caches.
	*/
	public function getStartDateTimeEpochForCache() {
	$epoch = $this->getStartDateTimeEpoch();
	$window = phutil_units('15 minutes in seconds');
	return ($epoch - $window);
	}

	protected function getConfiguration() {
	return array(
	self::CONFIG_AUX_PHID => true,
	self::CONFIG_COLUMN_SCHEMA => array(
	'name' => 'text',
	'description' => 'text',
	'isCancelled' => 'bool',
	'isAllDay' => 'bool',
	'icon' => 'text32',
	'mailKey' => 'bytes20',
	'isRecurring' => 'bool',
	'instanceOfEventPHID' => 'phid?',
	'sequenceIndex' => 'uint32?',
	'isStub' => 'bool',
	'utcInitialEpoch' => 'epoch',
	'utcUntilEpoch' => 'epoch?',
	'utcInstanceEpoch' => 'epoch?',

	'importAuthorPHID' => 'phid?',
	'importSourcePHID' => 'phid?',
	'importUIDIndex' => 'bytes12?',
	'importUID' => 'text?',

	// TODO: DEPRECATED.
	'allDayDateFrom' => 'epoch',
	'allDayDateTo' => 'epoch',
	'dateFrom' => 'epoch',
	'dateTo' => 'epoch',
	'recurrenceEndDate' => 'epoch?',
	),
	self::CONFIG_KEY_SCHEMA => array(
	'key_date' => array(
	'columns' => array('dateFrom', 'dateTo'),
	),
	'key_instance' => array(
	'columns' => array('instanceOfEventPHID', 'sequenceIndex'),
	'unique' => true,
	),
	'key_epoch' => array(
	'columns' => array('utcInitialEpoch', 'utcUntilEpoch'),
	),
	'key_rdate' => array(
	'columns' => array('instanceOfEventPHID', 'utcInstanceEpoch'),
	'unique' => true,
	),
	),
	self::CONFIG_SERIALIZATION => array(
	'recurrenceFrequency' => self::SERIALIZATION_JSON,
	'parameters' => self::SERIALIZATION_JSON,
	),
	) + parent::getConfiguration();
	}

	public function generatePHID() {
	return PhabricatorPHID::generateNewPHID(
	PhabricatorCalendarEventPHIDType::TYPECONST);
	}

	public function getMonogram() {
	return 'E'.$this->getID();
	}

	public function getInvitees() {
	+ if ($this->getIsGhostEvent() \|\| $this->getIsStub()) {
	+ if ($this->stubInvitees === null) {
	+ $this->stubInvitees = $this->newStubInvitees();
	+ }
	+ return $this->stubInvitees;
	+ }
	+
	return $this->assertAttached($this->invitees);
	}

	+ private function newStubInvitees() {
	+ $parent = $this->getParentEvent();
	+
	+ $parent_invitees = $parent->getInvitees();
	+ $stub_invitees = array();
	+
	+ foreach ($parent_invitees as $invitee) {
	+ $stub_invitee = id(new PhabricatorCalendarEventInvitee())
	+ ->setInviteePHID($invitee->getInviteePHID())
	+ ->setInviterPHID($invitee->getInviterPHID())
	+ ->setStatus(PhabricatorCalendarEventInvitee::STATUS_INVITED);
	+
	+ $stub_invitees[] = $stub_invitee;
	+ }
	+
	+ return $stub_invitees;
	+ }
	+
	public function attachInvitees(array $invitees) {
	$this->invitees = $invitees;
	return $this;
	}

	public function getInviteePHIDsForEdit() {
	$invitees = array();

	foreach ($this->getInvitees() as $invitee) {
	if ($invitee->isUninvited()) {
	continue;
	}
	$invitees[] = $invitee->getInviteePHID();
	}

	return $invitees;
	}

	public function getUserInviteStatus($phid) {
	$invitees = $this->getInvitees();
	$invitees = mpull($invitees, null, 'getInviteePHID');

	$invited = idx($invitees, $phid);
	if (!$invited) {
	return PhabricatorCalendarEventInvitee::STATUS_UNINVITED;
	}
	+
	$invited = $invited->getStatus();
	return $invited;
	}

	public function getIsUserAttending($phid) {
	$attending_status = PhabricatorCalendarEventInvitee::STATUS_ATTENDING;

	$old_status = $this->getUserInviteStatus($phid);
	$is_attending = ($old_status == $attending_status);

	return $is_attending;
	}

	public function getIsUserInvited($phid) {
	$uninvited_status = PhabricatorCalendarEventInvitee::STATUS_UNINVITED;
	$declined_status = PhabricatorCalendarEventInvitee::STATUS_DECLINED;
	$status = $this->getUserInviteStatus($phid);
	if ($status == $uninvited_status \|\| $status == $declined_status) {
	return false;
	}
	return true;
	}

	public function getIsGhostEvent() {
	return $this->isGhostEvent;
	}

	public function setIsGhostEvent($is_ghost_event) {
	$this->isGhostEvent = $is_ghost_event;
	return $this;
	}

	public function getURI() {
	if ($this->getIsGhostEvent()) {
	$base = $this->getParentEvent()->getURI();
	$sequence = $this->getSequenceIndex();
	return "{$base}/{$sequence}/";
	}

	return '/'.$this->getMonogram();
	}

	public function getParentEvent() {
	return $this->assertAttached($this->parentEvent);
	}

	public function attachParentEvent($event) {
	$this->parentEvent = $event;
	return $this;
	}

	public function isParentEvent() {
	return ($this->getIsRecurring() && !$this->getInstanceOfEventPHID());
	}

	public function isChildEvent() {
	return ($this->instanceOfEventPHID !== null);
	}

	public function isCancelledEvent() {
	if ($this->getIsCancelled()) {
	return true;
	}

	if ($this->isChildEvent()) {
	if ($this->getParentEvent()->getIsCancelled()) {
	return true;
	}
	}

	return false;
	}

	public function renderEventDate(
	PhabricatorUser $viewer,
	$show_end) {

	$start = $this->newStartDateTime();
	$end = $this->newEndDateTime();

	if ($show_end) {
	$min_date = $start->newPHPDateTime();
	$max_date = $end->newPHPDateTime();

	$min_day = $min_date->format('Y m d');
	$max_day = $max_date->format('Y m d');

	$show_end_date = ($min_day != $max_day);
	} else {
	$show_end_date = false;
	}

	$min_epoch = $start->getEpoch();
	$max_epoch = $end->getEpoch();

	if ($this->getIsAllDay()) {
	if ($show_end_date) {
	return pht(
	'%s - %s, All Day',
	phabricator_date($min_epoch, $viewer),
	phabricator_date($max_epoch, $viewer));
	} else {
	return pht(
	'%s, All Day',
	phabricator_date($min_epoch, $viewer));
	}
	} else if ($show_end_date) {
	return pht(
	'%s - %s',
	phabricator_datetime($min_epoch, $viewer),
	phabricator_datetime($max_epoch, $viewer));
	} else if ($show_end) {
	return pht(
	'%s - %s',
	phabricator_datetime($min_epoch, $viewer),
	phabricator_time($max_epoch, $viewer));
	} else {
	return pht(
	'%s',
	phabricator_datetime($min_epoch, $viewer));
	}
	}


	public function getDisplayIcon(PhabricatorUser $viewer) {
	if ($this->isCancelledEvent()) {
	return 'fa-times';
	}

	if ($viewer->isLoggedIn()) {
	$status = $this->getUserInviteStatus($viewer->getPHID());
	switch ($status) {
	case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
	return 'fa-check-circle';
	case PhabricatorCalendarEventInvitee::STATUS_INVITED:
	return 'fa-user-plus';
	case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
	return 'fa-times';
	}
	}

	if ($this->isImportedEvent()) {
	return 'fa-download';
	}

	return $this->getIcon();
	}

	public function getDisplayIconColor(PhabricatorUser $viewer) {
	if ($this->isCancelledEvent()) {
	return 'red';
	}

	if ($this->isImportedEvent()) {
	return 'orange';
	}

	if ($viewer->isLoggedIn()) {
	$status = $this->getUserInviteStatus($viewer->getPHID());
	switch ($status) {
	case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
	return 'green';
	case PhabricatorCalendarEventInvitee::STATUS_INVITED:
	return 'green';
	case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
	return 'grey';
	}
	}

	return 'bluegrey';
	}

	public function getDisplayIconLabel(PhabricatorUser $viewer) {
	if ($this->isCancelledEvent()) {
	return pht('Cancelled');
	}

	if ($viewer->isLoggedIn()) {
	$status = $this->getUserInviteStatus($viewer->getPHID());
	switch ($status) {
	case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
	return pht('Attending');
	case PhabricatorCalendarEventInvitee::STATUS_INVITED:
	return pht('Invited');
	case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
	return pht('Declined');
	}
	}

	return null;
	}

	public function getICSFilename() {
	return $this->getMonogram().'.ics';
	}

	public function newIntermediateEventNode(
	PhabricatorUser $viewer,
	array $children) {

	$base_uri = new PhutilURI(PhabricatorEnv::getProductionURI('/'));
	$domain = $base_uri->getDomain();

	// NOTE: For recurring events, all of the events in the series have the
	// same UID (the UID of the parent). The child event instances are
	// differentiated by the "RECURRENCE-ID" field.
	if ($this->isChildEvent()) {
	$parent = $this->getParentEvent();
	$instance_datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch(
	$this->getUTCInstanceEpoch());
	$recurrence_id = $instance_datetime->getISO8601();
	$rrule = null;
	} else {
	$parent = $this;
	$recurrence_id = null;
	$rrule = $this->newRecurrenceRule();
	}
	$uid = $parent->getPHID().'@'.$domain;

	$created = $this->getDateCreated();
	$created = PhutilCalendarAbsoluteDateTime::newFromEpoch($created);

	$modified = $this->getDateModified();
	$modified = PhutilCalendarAbsoluteDateTime::newFromEpoch($modified);

	$date_start = $this->newStartDateTime();
	$date_end = $this->newEndDateTime();

	if ($this->getIsAllDay()) {
	$date_start->setIsAllDay(true);
	$date_end->setIsAllDay(true);
	}

	$host_phid = $this->getHostPHID();

	$invitees = $this->getInvitees();
	foreach ($invitees as $key => $invitee) {
	if ($invitee->isUninvited()) {
	unset($invitees[$key]);
	}
	}

	$phids = array();
	$phids[] = $host_phid;
	foreach ($invitees as $invitee) {
	$phids[] = $invitee->getInviteePHID();
	}

	$handles = $viewer->loadHandles($phids);

	$host_handle = $handles[$host_phid];
	$host_name = $host_handle->getFullName();
	$host_uri = $host_handle->getURI();
	$host_uri = PhabricatorEnv::getURI($host_uri);

	$organizer = id(new PhutilCalendarUserNode())
	->setName($host_name)
	->setURI($host_uri);

	$attendees = array();
	foreach ($invitees as $invitee) {
	$invitee_phid = $invitee->getInviteePHID();
	$invitee_handle = $handles[$invitee_phid];
	$invitee_name = $invitee_handle->getFullName();
	$invitee_uri = $invitee_handle->getURI();
	$invitee_uri = PhabricatorEnv::getURI($invitee_uri);

	switch ($invitee->getStatus()) {
	case PhabricatorCalendarEventInvitee::STATUS_ATTENDING:
	$status = PhutilCalendarUserNode::STATUS_ACCEPTED;
	break;
	case PhabricatorCalendarEventInvitee::STATUS_DECLINED:
	$status = PhutilCalendarUserNode::STATUS_DECLINED;
	break;
	case PhabricatorCalendarEventInvitee::STATUS_INVITED:
	default:
	$status = PhutilCalendarUserNode::STATUS_INVITED;
	break;
	}

	$attendees[] = id(new PhutilCalendarUserNode())
	->setName($invitee_name)
	->setURI($invitee_uri)
	->setStatus($status);
	}

	// TODO: Use $children to generate EXDATE/RDATE information.

	$node = id(new PhutilCalendarEventNode())
	->setUID($uid)
	->setName($this->getName())
	->setDescription($this->getDescription())
	->setCreatedDateTime($created)
	->setModifiedDateTime($modified)
	->setStartDateTime($date_start)
	->setEndDateTime($date_end)
	->setOrganizer($organizer)
	->setAttendees($attendees);

	if ($rrule) {
	$node->setRecurrenceRule($rrule);
	}

	if ($recurrence_id) {
	$node->setRecurrenceID($recurrence_id);
	}

	return $node;
	}

	public function newStartDateTime() {
	$datetime = $this->getParameter('startDateTime');
	if ($datetime) {
	return $this->newDateTimeFromDictionary($datetime);
	}

	$epoch = $this->getDateFrom();
	return $this->newDateTimeFromEpoch($epoch);
	}

	public function getStartDateTimeEpoch() {
	return $this->newStartDateTime()->getEpoch();
	}

	public function newEndDateTime() {
	$datetime = $this->getParameter('endDateTime');
	if ($datetime) {
	return $this->newDateTimeFromDictionary($datetime);
	}

	$epoch = $this->getDateTo();
	return $this->newDateTimeFromEpoch($epoch);
	}

	public function getEndDateTimeEpoch() {
	return $this->newEndDateTime()->getEpoch();
	}

	public function newUntilDateTime() {
	$datetime = $this->getParameter('untilDateTime');
	if ($datetime) {
	return $this->newDateTimeFromDictionary($datetime);
	}

	$epoch = $this->getRecurrenceEndDate();
	if (!$epoch) {
	return null;
	}
	return $this->newDateTimeFromEpoch($epoch);
	}

	public function getUntilDateTimeEpoch() {
	$datetime = $this->newUntilDateTime();

	if (!$datetime) {
	return null;
	}

	return $datetime->getEpoch();
	}

	public function newDuration() {
	return id(new PhutilCalendarDuration())
	->setSeconds($this->getDuration());
	}

	public function newInstanceDateTime() {
	if (!$this->getIsRecurring()) {
	return null;
	}

	$index = $this->getSequenceIndex();
	if (!$index) {
	return null;
	}

	return $this->newSequenceIndexDateTime($index);
	}

	private function newDateTimeFromEpoch($epoch) {
	$datetime = PhutilCalendarAbsoluteDateTime::newFromEpoch($epoch);

	if ($this->getIsAllDay()) {
	$datetime->setIsAllDay(true);
	}

	return $this->newDateTimeFromDateTime($datetime);
	}

	private function newDateTimeFromDictionary(array $dict) {
	$datetime = PhutilCalendarAbsoluteDateTime::newFromDictionary($dict);
	return $this->newDateTimeFromDateTime($datetime);
	}

	private function newDateTimeFromDateTime(PhutilCalendarDateTime $datetime) {
	$viewer_timezone = $this->viewerTimezone;
	if ($viewer_timezone) {
	$datetime->setViewerTimezone($viewer_timezone);
	}

	return $datetime;
	}

	public function getParameter($key, $default = null) {
	return idx($this->parameters, $key, $default);
	}

	public function setParameter($key, $value) {
	$this->parameters[$key] = $value;
	return $this;
	}

	public function setStartDateTime(PhutilCalendarDateTime $datetime) {
	return $this->setParameter(
	'startDateTime',
	$datetime->newAbsoluteDateTime()->toDictionary());
	}

	public function setEndDateTime(PhutilCalendarDateTime $datetime) {
	return $this->setParameter(
	'endDateTime',
	$datetime->newAbsoluteDateTime()->toDictionary());
	}

	public function setUntilDateTime(PhutilCalendarDateTime $datetime) {
	return $this->setParameter(
	'untilDateTime',
	$datetime->newAbsoluteDateTime()->toDictionary());
	}

	public function setRecurrenceRule(PhutilCalendarRecurrenceRule $rrule) {
	return $this->setParameter(
	'recurrenceRule',
	$rrule->toDictionary());
	}

	public function newRecurrenceRule() {
	if ($this->isChildEvent()) {
	return $this->getParentEvent()->newRecurrenceRule();
	}

	if (!$this->getIsRecurring()) {
	return null;
	}

	$dict = $this->getParameter('recurrenceRule');
	if (!$dict) {
	return null;
	}

	$rrule = PhutilCalendarRecurrenceRule::newFromDictionary($dict);

	$start = $this->newStartDateTime();
	$rrule->setStartDateTime($start);

	$until = $this->newUntilDateTime();
	if ($until) {
	$rrule->setUntil($until);
	}

	$count = $this->getRecurrenceCount();
	if ($count) {
	$rrule->setCount($count);
	}

	return $rrule;
	}

	public function getRecurrenceCount() {
	$count = (int)$this->getParameter('recurrenceCount');

	if (!$count) {
	return null;
	}

	return $count;
	}

	public function newRecurrenceSet() {
	if ($this->isChildEvent()) {
	return $this->getParentEvent()->newRecurrenceSet();
	}

	$set = new PhutilCalendarRecurrenceSet();

	$rrule = $this->newRecurrenceRule();
	if (!$rrule) {
	return null;
	}

	$set->addSource($rrule);

	return $set;
	}

	public function isImportedEvent() {
	return (bool)$this->getImportSourcePHID();
	}

	public function getImportSource() {
	return $this->assertAttached($this->importSource);
	}

	public function attachImportSource(
	PhabricatorCalendarImport $import = null) {
	$this->importSource = $import;
	return $this;
	}


	/* -( Markup Interface )--------------------------------------------------- */


	/**
	* @task markup
	*/
	public function getMarkupFieldKey($field) {
	$hash = PhabricatorHash::digest($this->getMarkupText($field));
	$id = $this->getID();
	return "calendar:T{$id}:{$field}:{$hash}";
	}


	/**
	* @task markup
	*/
	public function getMarkupText($field) {
	return $this->getDescription();
	}


	/**
	* @task markup
	*/
	public function newMarkupEngine($field) {
	return PhabricatorMarkupEngine::newCalendarMarkupEngine();
	}


	/**
	* @task markup
	*/
	public function didMarkupText(
	$field,
	$output,
	PhutilMarkupEngine $engine) {
	return $output;
	}


	/**
	* @task markup
	*/
	public function shouldUseMarkupCache($field) {
	return (bool)$this->getID();
	}

	/* -( PhabricatorPolicyInterface )----------------------------------------- */


	public function getCapabilities() {
	return array(
	PhabricatorPolicyCapability::CAN_VIEW,
	PhabricatorPolicyCapability::CAN_EDIT,
	);
	}

	public function getPolicy($capability) {
	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	return $this->getViewPolicy();
	case PhabricatorPolicyCapability::CAN_EDIT:
	if ($this->getImportSource()) {
	return PhabricatorPolicies::POLICY_NOONE;
	} else {
	return $this->getEditPolicy();
	}
	}
	}

	public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	if ($this->getImportSource()) {
	return false;
	}

	// The host of an event can always view and edit it.
	$user_phid = $this->getHostPHID();
	if ($user_phid) {
	$viewer_phid = $viewer->getPHID();
	if ($viewer_phid == $user_phid) {
	return true;
	}
	}

	if ($capability == PhabricatorPolicyCapability::CAN_VIEW) {
	$status = $this->getUserInviteStatus($viewer->getPHID());
	if ($status == PhabricatorCalendarEventInvitee::STATUS_INVITED \|\|
	$status == PhabricatorCalendarEventInvitee::STATUS_ATTENDING \|\|
	$status == PhabricatorCalendarEventInvitee::STATUS_DECLINED) {
	return true;
	}
	}

	return false;
	}

	public function describeAutomaticCapability($capability) {
	if ($this->getImportSource()) {
	return pht(
	'Events imported from external sources can not be edited in '.
	'Phabricator.');
	}

	return pht(
	'The host of an event can always view and edit it. Users who are '.
	'invited to an event can always view it.');
	}


	/* -( PhabricatorExtendedPolicyInterface )--------------------------------- */


	public function getExtendedPolicy($capability, PhabricatorUser $viewer) {
	$extended = array();

	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	$import_source = $this->getImportSource();
	if ($import_source) {
	$extended[] = array(
	$import_source,
	PhabricatorPolicyCapability::CAN_VIEW,
	);
	}
	break;
	}

	return $extended;
	}


	/* -( PhabricatorApplicationTransactionInterface )------------------------- */


	public function getApplicationTransactionEditor() {
	return new PhabricatorCalendarEventEditor();
	}

	public function getApplicationTransactionObject() {
	return $this;
	}

	public function getApplicationTransactionTemplate() {
	return new PhabricatorCalendarEventTransaction();
	}

	public function willRenderTimeline(
	PhabricatorApplicationTransactionView $timeline,
	AphrontRequest $request) {

	return $timeline;
	}

	/* -( PhabricatorSubscribableInterface )----------------------------------- */


	public function isAutomaticallySubscribed($phid) {
	return ($phid == $this->getHostPHID());
	}

	/* -( PhabricatorTokenReceiverInterface )---------------------------------- */


	public function getUsersToNotifyOfTokenGiven() {
	return array($this->getHostPHID());
	}

	/* -( PhabricatorDestructibleInterface )----------------------------------- */


	public function destroyObjectPermanently(
	PhabricatorDestructionEngine $engine) {

	$this->openTransaction();
	$this->delete();
	$this->saveTransaction();
	}

	/* -( PhabricatorSpacesInterface )----------------------------------------- */


	public function getSpacePHID() {
	return $this->spacePHID;
	}


	/* -( PhabricatorFulltextInterface )--------------------------------------- */


	public function newFulltextEngine() {
	return new PhabricatorCalendarEventFulltextEngine();
	}


	/* -( PhabricatorConduitResultInterface )---------------------------------- */


	public function getFieldSpecificationsForConduit() {
	return array(
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('name')
	->setType('string')
	->setDescription(pht('The name of the event.')),
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('description')
	->setType('string')
	->setDescription(pht('The event description.')),
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('isAllDay')
	->setType('bool')
	->setDescription(pht('True if the event is an all day event.')),
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('startDateTime')
	->setType('datetime')
	->setDescription(pht('Start date and time of the event.')),
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('endDateTime')
	->setType('datetime')
	->setDescription(pht('End date and time of the event.')),
	);
	}

	public function getFieldValuesForConduit() {
	$start_datetime = $this->newStartDateTime();
	$end_datetime = $this->newEndDateTime();

	return array(
	'name' => $this->getName(),
	'description' => $this->getDescription(),
	'isAllDay' => (bool)$this->getIsAllDay(),
	'startDateTime' => $this->getConduitDateTime($start_datetime),
	'endDateTime' => $this->getConduitDateTime($end_datetime),
	);
	}

	public function getConduitSearchAttachments() {
	return array();
	}

	private function getConduitDateTime($datetime) {
	if (!$datetime) {
	return null;
	}

	$epoch = $datetime->getEpoch();

	// TODO: Possibly pass the actual viewer in from the Conduit stuff, or
	// retain it when setting the viewer timezone?
	$viewer = id(new PhabricatorUser())
	->overrideTimezoneIdentifier($this->viewerTimezone);

	return array(
	'epoch' => (int)$epoch,
	'display' => array(
	'default' => phabricator_datetime($epoch, $viewer),
	),
	'iso8601' => $datetime->getISO8601(),
	'timezone' => $this->viewerTimezone,
	);
	}

	}

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