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	diff --git a/src/applications/people/cache/PhabricatorUserCacheType.php b/src/applications/people/cache/PhabricatorUserCacheType.php
	index 29dec6e1f9..27e965fb43 100644
	--- a/src/applications/people/cache/PhabricatorUserCacheType.php
	+++ b/src/applications/people/cache/PhabricatorUserCacheType.php
	@@ -1,78 +1,74 @@
	<?php

	abstract class PhabricatorUserCacheType extends Phobject {

	final public function getViewer() {
	return PhabricatorUser::getOmnipotentUser();
	}

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

	public function canManageKey($key) {
	return false;
	}

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

	public function shouldValidateRawCacheData() {
	return false;
	}

	public function isRawCacheDataValid(PhabricatorUser $user, $key, $data) {
	throw new PhutilMethodNotImplementedException();
	}

	public function getValueFromStorage($value) {
	- return phutil_json_decode($value);
	- }
	-
	- public function getValueForStorage($value) {
	- return phutil_json_encode($value);
	+ return $value;
	}

	public function newValueForUsers($key, array $users) {
	return array();
	}

	final public function getUserCacheType() {
	return $this->getPhobjectClassConstant('CACHETYPE');
	}

	public static function getAllCacheTypes() {
	return id(new PhutilClassMapQuery())
	->setAncestorClass(__CLASS__)
	->setUniqueMethod('getUserCacheType')
	->execute();
	}

	public static function getCacheTypeForKey($key) {
	$all = self::getAllCacheTypes();

	foreach ($all as $type) {
	if ($type->canManageKey($key)) {
	return $type;
	}
	}

	return null;
	}

	public static function requireCacheTypeForKey($key) {
	$type = self::getCacheTypeForKey($key);

	if (!$type) {
	throw new Exception(
	pht(
	'Failed to load UserCacheType to manage key "%s". This cache type '.
	'is required.',
	$key));
	}

	return $type;
	}

	}
	diff --git a/src/applications/people/cache/PhabricatorUserMessageCountCacheType.php b/src/applications/people/cache/PhabricatorUserMessageCountCacheType.php
	index 52f53fe345..b6ff7b7263 100644
	--- a/src/applications/people/cache/PhabricatorUserMessageCountCacheType.php
	+++ b/src/applications/people/cache/PhabricatorUserMessageCountCacheType.php
	@@ -1,45 +1,41 @@
	<?php

	final class PhabricatorUserMessageCountCacheType
	extends PhabricatorUserCacheType {

	const CACHETYPE = 'message.count';

	const KEY_COUNT = 'user.message.count.v1';

	public function getAutoloadKeys() {
	return array(
	self::KEY_COUNT,
	);
	}

	public function canManageKey($key) {
	return ($key === self::KEY_COUNT);
	}

	public function getValueFromStorage($value) {
	return (int)$value;
	}

	- public function getValueForStorage($value) {
	- return $value;
	- }
	-
	public function newValueForUsers($key, array $users) {
	if (!$users) {
	return array();
	}

	$user_phids = mpull($users, 'getPHID');

	$unread_status = ConpherenceParticipationStatus::BEHIND;
	$unread = id(new ConpherenceParticipantCountQuery())
	->withParticipantPHIDs($user_phids)
	->withParticipationStatus($unread_status)
	->execute();

	$empty = array_fill_keys($user_phids, 0);
	return $unread + $empty;
	}

	}
	diff --git a/src/applications/people/cache/PhabricatorUserNotificationCountCacheType.php b/src/applications/people/cache/PhabricatorUserNotificationCountCacheType.php
	index 8eb1f464ce..c24db0cc09 100644
	--- a/src/applications/people/cache/PhabricatorUserNotificationCountCacheType.php
	+++ b/src/applications/people/cache/PhabricatorUserNotificationCountCacheType.php
	@@ -1,50 +1,46 @@
	<?php

	final class PhabricatorUserNotificationCountCacheType
	extends PhabricatorUserCacheType {

	const CACHETYPE = 'notification.count';

	const KEY_COUNT = 'user.notification.count.v1';

	public function getAutoloadKeys() {
	return array(
	self::KEY_COUNT,
	);
	}

	public function canManageKey($key) {
	return ($key === self::KEY_COUNT);
	}

	public function getValueFromStorage($value) {
	return (int)$value;
	}

	- public function getValueForStorage($value) {
	- return $value;
	- }
	-
	public function newValueForUsers($key, array $users) {
	if (!$users) {
	return array();
	}

	$user_phids = mpull($users, 'getPHID');

	$table = new PhabricatorFeedStoryNotification();
	$conn_r = $table->establishConnection('r');

	$rows = queryfx_all(
	$conn_r,
	'SELECT userPHID, COUNT(*) N FROM %T
	WHERE userPHID IN (%Ls) AND hasViewed = 0
	GROUP BY userPHID',
	$table->getTableName(),
	$user_phids);

	$empty = array_fill_keys($user_phids, 0);
	return ipull($rows, 'N', 'userPHID') + $empty;
	}

	}
	diff --git a/src/applications/people/cache/PhabricatorUserPreferencesCacheType.php b/src/applications/people/cache/PhabricatorUserPreferencesCacheType.php
	index 77aeafbf16..a2187a4599 100644
	--- a/src/applications/people/cache/PhabricatorUserPreferencesCacheType.php
	+++ b/src/applications/people/cache/PhabricatorUserPreferencesCacheType.php
	@@ -1,35 +1,45 @@
	<?php

	final class PhabricatorUserPreferencesCacheType
	extends PhabricatorUserCacheType {

	const CACHETYPE = 'preferences';

	const KEY_PREFERENCES = 'user.preferences.v1';

	public function getAutoloadKeys() {
	return array(
	self::KEY_PREFERENCES,
	);
	}

	public function canManageKey($key) {
	return ($key === self::KEY_PREFERENCES);
	}

	+ public function getValueFromStorage($value) {
	+ return phutil_json_decode($value);
	+ }
	+
	public function newValueForUsers($key, array $users) {
	$viewer = $this->getViewer();

	$user_phids = mpull($users, 'getPHID');

	$preferences = id(new PhabricatorUserPreferencesQuery())
	->setViewer($viewer)
	->withUserPHIDs($user_phids)
	->execute();

	- $empty = array_fill_keys($user_phids, array());
	+ $settings = mpull($preferences, 'getPreferences', 'getUserPHID');
	+
	+ $results = array();
	+ foreach ($user_phids as $user_phid) {
	+ $value = idx($settings, $user_phid, array());
	+ $results[$user_phid] = phutil_json_encode($value);
	+ }

	- return mpull($preferences, 'getPreferences', 'getUserPHID') + $empty;
	+ return $results;
	}

	}
	diff --git a/src/applications/people/cache/PhabricatorUserProfileImageCacheType.php b/src/applications/people/cache/PhabricatorUserProfileImageCacheType.php
	index 8938441cc5..b3f944a3ed 100644
	--- a/src/applications/people/cache/PhabricatorUserProfileImageCacheType.php
	+++ b/src/applications/people/cache/PhabricatorUserProfileImageCacheType.php
	@@ -1,82 +1,82 @@
	<?php

	final class PhabricatorUserProfileImageCacheType
	extends PhabricatorUserCacheType {

	const CACHETYPE = 'user.profile';

	const KEY_URI = 'user.profile.image.uri.v1';

	public function getAutoloadKeys() {
	return array(
	self::KEY_URI,
	);
	}

	public function canManageKey($key) {
	return ($key === self::KEY_URI);
	}

	+ public function getDefaultValue() {
	+ return PhabricatorUser::getDefaultProfileImageURI();
	+ }
	+
	public function newValueForUsers($key, array $users) {
	$viewer = $this->getViewer();

	$file_phids = mpull($users, 'getProfileImagePHID');
	$file_phids = array_filter($file_phids);

	if ($file_phids) {
	$files = id(new PhabricatorFileQuery())
	->setViewer($viewer)
	->withPHIDs($file_phids)
	->execute();
	$files = mpull($files, null, 'getPHID');
	} else {
	$files = array();
	}

	$results = array();
	foreach ($users as $user) {
	$image_phid = $user->getProfileImagePHID();
	if (isset($files[$image_phid])) {
	$image_uri = $files[$image_phid]->getBestURI();
	} else {
	$image_uri = PhabricatorUser::getDefaultProfileImageURI();
	}

	$user_phid = $user->getPHID();
	$version = $this->getCacheVersion($user);
	$results[$user_phid] = "{$version},{$image_uri}";
	}

	return $results;
	}

	public function getValueFromStorage($value) {
	$parts = explode(',', $value, 2);
	return end($parts);
	}

	- public function getValueForStorage($value) {
	- return $value;
	- }
	-
	public function shouldValidateRawCacheData() {
	return true;
	}

	public function isRawCacheDataValid(PhabricatorUser $user, $key, $data) {
	$parts = explode(',', $data, 2);
	$version = reset($parts);
	return ($version === $this->getCacheVersion($user));
	}

	private function getCacheVersion(PhabricatorUser $user) {
	$parts = array(
	PhabricatorEnv::getCDNURI('/'),
	PhabricatorEnv::getEnvConfig('cluster.instance'),
	$user->getProfileImagePHID(),
	);
	$parts = serialize($parts);
	return PhabricatorHash::digestForIndex($parts);
	}

	}
	diff --git a/src/applications/people/query/PhabricatorPeopleQuery.php b/src/applications/people/query/PhabricatorPeopleQuery.php
	index 46722038e0..6c1fa7b68d 100644
	--- a/src/applications/people/query/PhabricatorPeopleQuery.php
	+++ b/src/applications/people/query/PhabricatorPeopleQuery.php
	@@ -1,570 +1,569 @@
	<?php

	final class PhabricatorPeopleQuery
	extends PhabricatorCursorPagedPolicyAwareQuery {

	private $usernames;
	private $realnames;
	private $emails;
	private $phids;
	private $ids;
	private $dateCreatedAfter;
	private $dateCreatedBefore;
	private $isAdmin;
	private $isSystemAgent;
	private $isMailingList;
	private $isDisabled;
	private $isApproved;
	private $nameLike;
	private $nameTokens;

	private $needPrimaryEmail;
	private $needProfile;
	private $needProfileImage;
	private $needAvailability;
	private $needBadges;
	private $cacheKeys = array();

	public function withIDs(array $ids) {
	$this->ids = $ids;
	return $this;
	}

	public function withPHIDs(array $phids) {
	$this->phids = $phids;
	return $this;
	}

	public function withEmails(array $emails) {
	$this->emails = $emails;
	return $this;
	}

	public function withRealnames(array $realnames) {
	$this->realnames = $realnames;
	return $this;
	}

	public function withUsernames(array $usernames) {
	$this->usernames = $usernames;
	return $this;
	}

	public function withDateCreatedBefore($date_created_before) {
	$this->dateCreatedBefore = $date_created_before;
	return $this;
	}

	public function withDateCreatedAfter($date_created_after) {
	$this->dateCreatedAfter = $date_created_after;
	return $this;
	}

	public function withIsAdmin($admin) {
	$this->isAdmin = $admin;
	return $this;
	}

	public function withIsSystemAgent($system_agent) {
	$this->isSystemAgent = $system_agent;
	return $this;
	}

	public function withIsMailingList($mailing_list) {
	$this->isMailingList = $mailing_list;
	return $this;
	}

	public function withIsDisabled($disabled) {
	$this->isDisabled = $disabled;
	return $this;
	}

	public function withIsApproved($approved) {
	$this->isApproved = $approved;
	return $this;
	}

	public function withNameLike($like) {
	$this->nameLike = $like;
	return $this;
	}

	public function withNameTokens(array $tokens) {
	$this->nameTokens = array_values($tokens);
	return $this;
	}

	public function needPrimaryEmail($need) {
	$this->needPrimaryEmail = $need;
	return $this;
	}

	public function needProfile($need) {
	$this->needProfile = $need;
	return $this;
	}

	public function needProfileImage($need) {
	$cache_key = PhabricatorUserProfileImageCacheType::KEY_URI;

	if ($need) {
	$this->cacheKeys[$cache_key] = true;
	} else {
	unset($this->cacheKeys[$cache_key]);
	}

	return $this;
	}

	public function needAvailability($need) {
	$this->needAvailability = $need;
	return $this;
	}

	public function needBadges($need) {
	$this->needBadges = $need;
	return $this;
	}

	public function needUserSettings($need) {
	$cache_key = PhabricatorUserPreferencesCacheType::KEY_PREFERENCES;

	if ($need) {
	$this->cacheKeys[$cache_key] = true;
	} else {
	unset($this->cacheKeys[$cache_key]);
	}

	return $this;
	}

	public function newResultObject() {
	return new PhabricatorUser();
	}

	protected function loadPage() {
	$table = new PhabricatorUser();
	$data = $this->loadStandardPageRows($table);

	if ($this->needPrimaryEmail) {
	$table->putInSet(new LiskDAOSet());
	}

	return $table->loadAllFromArray($data);
	}

	protected function didFilterPage(array $users) {
	if ($this->needProfile) {
	$user_list = mpull($users, null, 'getPHID');
	$profiles = new PhabricatorUserProfile();
	$profiles = $profiles->loadAllWhere(
	'userPHID IN (%Ls)',
	array_keys($user_list));

	$profiles = mpull($profiles, null, 'getUserPHID');
	foreach ($user_list as $user_phid => $user) {
	$profile = idx($profiles, $user_phid);

	if (!$profile) {
	$profile = PhabricatorUserProfile::initializeNewProfile($user);
	}

	$user->attachUserProfile($profile);
	}
	}

	if ($this->needBadges) {
	$awards = id(new PhabricatorBadgesAwardQuery())
	->setViewer($this->getViewer())
	->withRecipientPHIDs(mpull($users, 'getPHID'))
	->execute();

	$awards = mgroup($awards, 'getRecipientPHID');

	foreach ($users as $user) {
	$user_awards = idx($awards, $user->getPHID(), array());
	$badge_phids = mpull($user_awards, 'getBadgePHID');
	$user->attachBadgePHIDs($badge_phids);
	}
	}

	if ($this->needAvailability) {
	$rebuild = array();
	foreach ($users as $user) {
	$cache = $user->getAvailabilityCache();
	if ($cache !== null) {
	$user->attachAvailability($cache);
	} else {
	$rebuild[] = $user;
	}
	}

	if ($rebuild) {
	$this->rebuildAvailabilityCache($rebuild);
	}
	}

	$this->fillUserCaches($users);

	return $users;
	}

	protected function shouldGroupQueryResultRows() {
	if ($this->nameTokens) {
	return true;
	}

	return parent::shouldGroupQueryResultRows();
	}

	protected function buildJoinClauseParts(AphrontDatabaseConnection $conn) {
	$joins = parent::buildJoinClauseParts($conn);

	if ($this->emails) {
	$email_table = new PhabricatorUserEmail();
	$joins[] = qsprintf(
	$conn,
	'JOIN %T email ON email.userPHID = user.PHID',
	$email_table->getTableName());
	}

	if ($this->nameTokens) {
	foreach ($this->nameTokens as $key => $token) {
	$token_table = 'token_'.$key;
	$joins[] = qsprintf(
	$conn,
	'JOIN %T %T ON %T.userID = user.id AND %T.token LIKE %>',
	PhabricatorUser::NAMETOKEN_TABLE,
	$token_table,
	$token_table,
	$token_table,
	$token);
	}
	}

	return $joins;
	}

	protected function buildWhereClauseParts(AphrontDatabaseConnection $conn) {
	$where = parent::buildWhereClauseParts($conn);

	if ($this->usernames !== null) {
	$where[] = qsprintf(
	$conn,
	'user.userName IN (%Ls)',
	$this->usernames);
	}

	if ($this->emails !== null) {
	$where[] = qsprintf(
	$conn,
	'email.address IN (%Ls)',
	$this->emails);
	}

	if ($this->realnames !== null) {
	$where[] = qsprintf(
	$conn,
	'user.realName IN (%Ls)',
	$this->realnames);
	}

	if ($this->phids !== null) {
	$where[] = qsprintf(
	$conn,
	'user.phid IN (%Ls)',
	$this->phids);
	}

	if ($this->ids !== null) {
	$where[] = qsprintf(
	$conn,
	'user.id IN (%Ld)',
	$this->ids);
	}

	if ($this->dateCreatedAfter) {
	$where[] = qsprintf(
	$conn,
	'user.dateCreated >= %d',
	$this->dateCreatedAfter);
	}

	if ($this->dateCreatedBefore) {
	$where[] = qsprintf(
	$conn,
	'user.dateCreated <= %d',
	$this->dateCreatedBefore);
	}

	if ($this->isAdmin !== null) {
	$where[] = qsprintf(
	$conn,
	'user.isAdmin = %d',
	(int)$this->isAdmin);
	}

	if ($this->isDisabled !== null) {
	$where[] = qsprintf(
	$conn,
	'user.isDisabled = %d',
	(int)$this->isDisabled);
	}

	if ($this->isApproved !== null) {
	$where[] = qsprintf(
	$conn,
	'user.isApproved = %d',
	(int)$this->isApproved);
	}

	if ($this->isSystemAgent !== null) {
	$where[] = qsprintf(
	$conn,
	'user.isSystemAgent = %d',
	(int)$this->isSystemAgent);
	}

	if ($this->isMailingList !== null) {
	$where[] = qsprintf(
	$conn,
	'user.isMailingList = %d',
	(int)$this->isMailingList);
	}

	if (strlen($this->nameLike)) {
	$where[] = qsprintf(
	$conn,
	'user.username LIKE %~ OR user.realname LIKE %~',
	$this->nameLike,
	$this->nameLike);
	}

	return $where;
	}

	protected function getPrimaryTableAlias() {
	return 'user';
	}

	public function getQueryApplicationClass() {
	return 'PhabricatorPeopleApplication';
	}

	public function getOrderableColumns() {
	return parent::getOrderableColumns() + array(
	'username' => array(
	'table' => 'user',
	'column' => 'username',
	'type' => 'string',
	'reverse' => true,
	'unique' => true,
	),
	);
	}

	protected function getPagingValueMap($cursor, array $keys) {
	$user = $this->loadCursorObject($cursor);
	return array(
	'id' => $user->getID(),
	'username' => $user->getUsername(),
	);
	}

	private function rebuildAvailabilityCache(array $rebuild) {
	$rebuild = mpull($rebuild, null, 'getPHID');

	// Limit the window we look at because far-future events are largely
	// irrelevant and this makes the cache cheaper to build and allows it to
	// self-heal over time.
	$min_range = PhabricatorTime::getNow();
	$max_range = $min_range + phutil_units('72 hours in seconds');

	// NOTE: We don't need to generate ghosts here, because we only care if
	// the user is attending, and you can't attend a ghost event: RSVP'ing
	// to it creates a real event.

	$events = id(new PhabricatorCalendarEventQuery())
	->setViewer(PhabricatorUser::getOmnipotentUser())
	->withInvitedPHIDs(array_keys($rebuild))
	->withIsCancelled(false)
	->withDateRange($min_range, $max_range)
	->execute();

	// Group all the events by invited user. Only examine events that users
	// are actually attending.
	$map = array();
	foreach ($events as $event) {
	foreach ($event->getInvitees() as $invitee) {
	if (!$invitee->isAttending()) {
	continue;
	}

	$invitee_phid = $invitee->getInviteePHID();
	if (!isset($rebuild[$invitee_phid])) {
	continue;
	}

	$map[$invitee_phid][] = $event;
	}
	}

	foreach ($rebuild as $phid => $user) {
	$events = idx($map, $phid, array());

	$cursor = $min_range;
	if ($events) {
	// Find the next time when the user has no meetings. If we move forward
	// because of an event, we check again for events after that one ends.
	while (true) {
	foreach ($events as $event) {
	$from = $event->getDateFromForCache();
	$to = $event->getDateTo();
	if (($from <= $cursor) && ($to > $cursor)) {
	$cursor = $to;
	continue 2;
	}
	}
	break;
	}
	}

	if ($cursor > $min_range) {
	$availability = array(
	'until' => $cursor,
	);
	$availability_ttl = $cursor;
	} else {
	$availability = array(
	'until' => null,
	);
	$availability_ttl = $max_range;
	}

	// Never TTL the cache to longer than the maximum range we examined.
	$availability_ttl = min($availability_ttl, $max_range);

	$user->writeAvailabilityCache($availability, $availability_ttl);
	$user->attachAvailability($availability);
	}
	}

	private function fillUserCaches(array $users) {
	if (!$this->cacheKeys) {
	return;
	}

	$user_map = mpull($users, null, 'getPHID');
	$keys = array_keys($this->cacheKeys);

	$hashes = array();
	foreach ($keys as $key) {
	$hashes[] = PhabricatorHash::digestForIndex($key);
	}

	$types = PhabricatorUserCacheType::getAllCacheTypes();

	// First, pull any available caches. If we wanted to be particularly clever
	// we could do this with JOINs in the main query.

	$cache_table = new PhabricatorUserCache();
	$cache_conn = $cache_table->establishConnection('r');

	$cache_data = queryfx_all(
	$cache_conn,
	'SELECT cacheKey, userPHID, cacheData, cacheType FROM %T
	WHERE cacheIndex IN (%Ls) AND userPHID IN (%Ls)',
	$cache_table->getTableName(),
	$hashes,
	array_keys($user_map));

	$skip_validation = array();

	// After we read caches from the database, discard any which have data that
	// invalid or out of date. This allows cache types to implement TTLs or
	// versions instead of or in addition to explicit cache clears.
	foreach ($cache_data as $row_key => $row) {
	$cache_type = $row['cacheType'];

	if (isset($skip_validation[$cache_type])) {
	continue;
	}

	if (empty($types[$cache_type])) {
	unset($cache_data[$row_key]);
	continue;
	}

	$type = $types[$cache_type];
	if (!$type->shouldValidateRawCacheData()) {
	$skip_validation[$cache_type] = true;
	continue;
	}

	$user = $user_map[$row['userPHID']];
	$raw_data = $row['cacheData'];
	if (!$type->isRawCacheDataValid($user, $row['cacheKey'], $raw_data)) {
	unset($cache_data[$row_key]);
	continue;
	}
	}

	$need = array();

	$cache_data = igroup($cache_data, 'userPHID');
	foreach ($user_map as $user_phid => $user) {
	$raw_rows = idx($cache_data, $user_phid, array());
	$raw_data = ipull($raw_rows, 'cacheData', 'cacheKey');

	foreach ($keys as $key) {
	if (isset($raw_data[$key]) \|\| array_key_exists($key, $raw_data)) {
	continue;
	}
	$need[$key][$user_phid] = $user;
	}

	$user->attachRawCacheData($raw_data);
	}

	// If we missed any cache values, bulk-construct them now. This is
	// usually much cheaper than generating them on-demand for each user
	// record.

	if (!$need) {
	return;
	}

	$writes = array();
	foreach ($need as $cache_key => $need_users) {
	$type = PhabricatorUserCacheType::getCacheTypeForKey($cache_key);
	if (!$type) {
	continue;
	}

	$data = $type->newValueForUsers($cache_key, $need_users);

	- foreach ($data as $user_phid => $value) {
	- $raw_value = $type->getValueForStorage($value);
	+ foreach ($data as $user_phid => $raw_value) {
	$data[$user_phid] = $raw_value;
	$writes[] = array(
	'userPHID' => $user_phid,
	'key' => $cache_key,
	'type' => $type,
	'value' => $raw_value,
	);
	}

	foreach ($need_users as $user_phid => $user) {
	if (isset($data[$user_phid]) \|\| array_key_exists($user_phid, $data)) {
	$user->attachRawCacheData(
	array(
	$cache_key => $data[$user_phid],
	));
	}
	}
	}

	PhabricatorUserCache::writeCaches($writes);
	}
	}
	diff --git a/src/applications/people/storage/PhabricatorUser.php b/src/applications/people/storage/PhabricatorUser.php
	index 5dcd3ea073..e78cd25d70 100644
	--- a/src/applications/people/storage/PhabricatorUser.php
	+++ b/src/applications/people/storage/PhabricatorUser.php
	@@ -1,1494 +1,1493 @@
	<?php

	/**
	* @task availability Availability
	* @task image-cache Profile Image Cache
	* @task factors Multi-Factor Authentication
	* @task handles Managing Handles
	* @task settings Settings
	* @task cache User Cache
	*/
	final class PhabricatorUser
	extends PhabricatorUserDAO
	implements
	PhutilPerson,
	PhabricatorPolicyInterface,
	PhabricatorCustomFieldInterface,
	PhabricatorDestructibleInterface,
	PhabricatorSSHPublicKeyInterface,
	PhabricatorFlaggableInterface,
	PhabricatorApplicationTransactionInterface,
	PhabricatorFulltextInterface,
	PhabricatorConduitResultInterface {

	const SESSION_TABLE = 'phabricator_session';
	const NAMETOKEN_TABLE = 'user_nametoken';
	const MAXIMUM_USERNAME_LENGTH = 64;

	protected $userName;
	protected $realName;
	protected $passwordSalt;
	protected $passwordHash;
	protected $profileImagePHID;
	protected $availabilityCache;
	protected $availabilityCacheTTL;

	protected $conduitCertificate;

	protected $isSystemAgent = 0;
	protected $isMailingList = 0;
	protected $isAdmin = 0;
	protected $isDisabled = 0;
	protected $isEmailVerified = 0;
	protected $isApproved = 0;
	protected $isEnrolledInMultiFactor = 0;

	protected $accountSecret;

	private $profile = null;
	private $availability = self::ATTACHABLE;
	private $preferences = null;
	private $omnipotent = false;
	private $customFields = self::ATTACHABLE;
	private $badgePHIDs = self::ATTACHABLE;

	private $alternateCSRFString = self::ATTACHABLE;
	private $session = self::ATTACHABLE;
	private $rawCacheData = array();
	private $usableCacheData = array();

	private $authorities = array();
	private $handlePool;
	private $csrfSalt;

	private $settingCacheKeys = array();
	private $settingCache = array();
	private $allowInlineCacheGeneration;

	protected function readField($field) {
	switch ($field) {
	// Make sure these return booleans.
	case 'isAdmin':
	return (bool)$this->isAdmin;
	case 'isDisabled':
	return (bool)$this->isDisabled;
	case 'isSystemAgent':
	return (bool)$this->isSystemAgent;
	case 'isMailingList':
	return (bool)$this->isMailingList;
	case 'isEmailVerified':
	return (bool)$this->isEmailVerified;
	case 'isApproved':
	return (bool)$this->isApproved;
	default:
	return parent::readField($field);
	}
	}


	/**
	* Is this a live account which has passed required approvals? Returns true
	* if this is an enabled, verified (if required), approved (if required)
	* account, and false otherwise.
	*
	* @return bool True if this is a standard, usable account.
	*/
	public function isUserActivated() {
	if ($this->isOmnipotent()) {
	return true;
	}

	if ($this->getIsDisabled()) {
	return false;
	}

	if (!$this->getIsApproved()) {
	return false;
	}

	if (PhabricatorUserEmail::isEmailVerificationRequired()) {
	if (!$this->getIsEmailVerified()) {
	return false;
	}
	}

	return true;
	}

	public function canEstablishWebSessions() {
	if ($this->getIsMailingList()) {
	return false;
	}

	if ($this->getIsSystemAgent()) {
	return false;
	}

	return true;
	}

	public function canEstablishAPISessions() {
	if ($this->getIsDisabled()) {
	return false;
	}

	// Intracluster requests are permitted even if the user is logged out:
	// in particular, public users are allowed to issue intracluster requests
	// when browsing Diffusion.
	if (PhabricatorEnv::isClusterRemoteAddress()) {
	if (!$this->isLoggedIn()) {
	return true;
	}
	}

	if (!$this->isUserActivated()) {
	return false;
	}

	if ($this->getIsMailingList()) {
	return false;
	}

	return true;
	}

	public function canEstablishSSHSessions() {
	if (!$this->isUserActivated()) {
	return false;
	}

	if ($this->getIsMailingList()) {
	return false;
	}

	return true;
	}

	/**
	* Returns `true` if this is a standard user who is logged in. Returns `false`
	* for logged out, anonymous, or external users.
	*
	* @return bool `true` if the user is a standard user who is logged in with
	* a normal session.
	*/
	public function getIsStandardUser() {
	$type_user = PhabricatorPeopleUserPHIDType::TYPECONST;
	return $this->getPHID() && (phid_get_type($this->getPHID()) == $type_user);
	}

	protected function getConfiguration() {
	return array(
	self::CONFIG_AUX_PHID => true,
	self::CONFIG_COLUMN_SCHEMA => array(
	'userName' => 'sort64',
	'realName' => 'text128',
	'passwordSalt' => 'text32?',
	'passwordHash' => 'text128?',
	'profileImagePHID' => 'phid?',
	'conduitCertificate' => 'text255',
	'isSystemAgent' => 'bool',
	'isMailingList' => 'bool',
	'isDisabled' => 'bool',
	'isAdmin' => 'bool',
	'isEmailVerified' => 'uint32',
	'isApproved' => 'uint32',
	'accountSecret' => 'bytes64',
	'isEnrolledInMultiFactor' => 'bool',
	'availabilityCache' => 'text255?',
	'availabilityCacheTTL' => 'uint32?',
	),
	self::CONFIG_KEY_SCHEMA => array(
	'key_phid' => null,
	'phid' => array(
	'columns' => array('phid'),
	'unique' => true,
	),
	'userName' => array(
	'columns' => array('userName'),
	'unique' => true,
	),
	'realName' => array(
	'columns' => array('realName'),
	),
	'key_approved' => array(
	'columns' => array('isApproved'),
	),
	),
	self::CONFIG_NO_MUTATE => array(
	'availabilityCache' => true,
	'availabilityCacheTTL' => true,
	),
	) + parent::getConfiguration();
	}

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

	public function setPassword(PhutilOpaqueEnvelope $envelope) {
	if (!$this->getPHID()) {
	throw new Exception(
	pht(
	'You can not set a password for an unsaved user because their PHID '.
	'is a salt component in the password hash.'));
	}

	if (!strlen($envelope->openEnvelope())) {
	$this->setPasswordHash('');
	} else {
	$this->setPasswordSalt(md5(Filesystem::readRandomBytes(32)));
	$hash = $this->hashPassword($envelope);
	$this->setPasswordHash($hash->openEnvelope());
	}
	return $this;
	}

	public function getMonogram() {
	return '@'.$this->getUsername();
	}

	public function isLoggedIn() {
	return !($this->getPHID() === null);
	}

	public function save() {
	if (!$this->getConduitCertificate()) {
	$this->setConduitCertificate($this->generateConduitCertificate());
	}

	if (!strlen($this->getAccountSecret())) {
	$this->setAccountSecret(Filesystem::readRandomCharacters(64));
	}

	$result = parent::save();

	if ($this->profile) {
	$this->profile->save();
	}

	$this->updateNameTokens();

	PhabricatorSearchWorker::queueDocumentForIndexing($this->getPHID());

	return $result;
	}

	public function attachSession(PhabricatorAuthSession $session) {
	$this->session = $session;
	return $this;
	}

	public function getSession() {
	return $this->assertAttached($this->session);
	}

	public function hasSession() {
	return ($this->session !== self::ATTACHABLE);
	}

	private function generateConduitCertificate() {
	return Filesystem::readRandomCharacters(255);
	}

	public function comparePassword(PhutilOpaqueEnvelope $envelope) {
	if (!strlen($envelope->openEnvelope())) {
	return false;
	}
	if (!strlen($this->getPasswordHash())) {
	return false;
	}

	return PhabricatorPasswordHasher::comparePassword(
	$this->getPasswordHashInput($envelope),
	new PhutilOpaqueEnvelope($this->getPasswordHash()));
	}

	private function getPasswordHashInput(PhutilOpaqueEnvelope $password) {
	$input =
	$this->getUsername().
	$password->openEnvelope().
	$this->getPHID().
	$this->getPasswordSalt();

	return new PhutilOpaqueEnvelope($input);
	}

	private function hashPassword(PhutilOpaqueEnvelope $password) {
	$hasher = PhabricatorPasswordHasher::getBestHasher();

	$input_envelope = $this->getPasswordHashInput($password);
	return $hasher->getPasswordHashForStorage($input_envelope);
	}

	const CSRF_CYCLE_FREQUENCY = 3600;
	const CSRF_SALT_LENGTH = 8;
	const CSRF_TOKEN_LENGTH = 16;
	const CSRF_BREACH_PREFIX = 'B@';

	const EMAIL_CYCLE_FREQUENCY = 86400;
	const EMAIL_TOKEN_LENGTH = 24;

	private function getRawCSRFToken($offset = 0) {
	return $this->generateToken(
	time() + (self::CSRF_CYCLE_FREQUENCY * $offset),
	self::CSRF_CYCLE_FREQUENCY,
	PhabricatorEnv::getEnvConfig('phabricator.csrf-key'),
	self::CSRF_TOKEN_LENGTH);
	}

	public function getCSRFToken() {
	if ($this->isOmnipotent()) {
	// We may end up here when called from the daemons. The omnipotent user
	// has no meaningful CSRF token, so just return `null`.
	return null;
	}

	if ($this->csrfSalt === null) {
	$this->csrfSalt = Filesystem::readRandomCharacters(
	self::CSRF_SALT_LENGTH);
	}

	$salt = $this->csrfSalt;

	// Generate a token hash to mitigate BREACH attacks against SSL. See
	// discussion in T3684.
	$token = $this->getRawCSRFToken();
	$hash = PhabricatorHash::digest($token, $salt);
	return self::CSRF_BREACH_PREFIX.$salt.substr(
	$hash, 0, self::CSRF_TOKEN_LENGTH);
	}

	public function validateCSRFToken($token) {
	// We expect a BREACH-mitigating token. See T3684.
	$breach_prefix = self::CSRF_BREACH_PREFIX;
	$breach_prelen = strlen($breach_prefix);
	if (strncmp($token, $breach_prefix, $breach_prelen) !== 0) {
	return false;
	}

	$salt = substr($token, $breach_prelen, self::CSRF_SALT_LENGTH);
	$token = substr($token, $breach_prelen + self::CSRF_SALT_LENGTH);

	// When the user posts a form, we check that it contains a valid CSRF token.
	// Tokens cycle each hour (every CSRF_CYLCE_FREQUENCY seconds) and we accept
	// either the current token, the next token (users can submit a "future"
	// token if you have two web frontends that have some clock skew) or any of
	// the last 6 tokens. This means that pages are valid for up to 7 hours.
	// There is also some Javascript which periodically refreshes the CSRF
	// tokens on each page, so theoretically pages should be valid indefinitely.
	// However, this code may fail to run (if the user loses their internet
	// connection, or there's a JS problem, or they don't have JS enabled).
	// Choosing the size of the window in which we accept old CSRF tokens is
	// an issue of balancing concerns between security and usability. We could
	// choose a very narrow (e.g., 1-hour) window to reduce vulnerability to
	// attacks using captured CSRF tokens, but it's also more likely that real
	// users will be affected by this, e.g. if they close their laptop for an
	// hour, open it back up, and try to submit a form before the CSRF refresh
	// can kick in. Since the user experience of submitting a form with expired
	// CSRF is often quite bad (you basically lose data, or it's a big pain to
	// recover at least) and I believe we gain little additional protection
	// by keeping the window very short (the overwhelming value here is in
	// preventing blind attacks, and most attacks which can capture CSRF tokens
	// can also just capture authentication information [sniffing networks]
	// or act as the user [xss]) the 7 hour default seems like a reasonable
	// balance. Other major platforms have much longer CSRF token lifetimes,
	// like Rails (session duration) and Django (forever), which suggests this
	// is a reasonable analysis.
	$csrf_window = 6;

	for ($ii = -$csrf_window; $ii <= 1; $ii++) {
	$valid = $this->getRawCSRFToken($ii);

	$digest = PhabricatorHash::digest($valid, $salt);
	$digest = substr($digest, 0, self::CSRF_TOKEN_LENGTH);
	if (phutil_hashes_are_identical($digest, $token)) {
	return true;
	}
	}

	return false;
	}

	private function generateToken($epoch, $frequency, $key, $len) {
	if ($this->getPHID()) {
	$vec = $this->getPHID().$this->getAccountSecret();
	} else {
	$vec = $this->getAlternateCSRFString();
	}

	if ($this->hasSession()) {
	$vec = $vec.$this->getSession()->getSessionKey();
	}

	$time_block = floor($epoch / $frequency);
	$vec = $vec.$key.$time_block;

	return substr(PhabricatorHash::digest($vec), 0, $len);
	}

	public function getUserProfile() {
	return $this->assertAttached($this->profile);
	}

	public function attachUserProfile(PhabricatorUserProfile $profile) {
	$this->profile = $profile;
	return $this;
	}

	public function loadUserProfile() {
	if ($this->profile) {
	return $this->profile;
	}

	$profile_dao = new PhabricatorUserProfile();
	$this->profile = $profile_dao->loadOneWhere('userPHID = %s',
	$this->getPHID());

	if (!$this->profile) {
	$this->profile = PhabricatorUserProfile::initializeNewProfile($this);
	}

	return $this->profile;
	}

	public function loadPrimaryEmailAddress() {
	$email = $this->loadPrimaryEmail();
	if (!$email) {
	throw new Exception(pht('User has no primary email address!'));
	}
	return $email->getAddress();
	}

	public function loadPrimaryEmail() {
	return $this->loadOneRelative(
	new PhabricatorUserEmail(),
	'userPHID',
	'getPHID',
	'(isPrimary = 1)');
	}


	/* -( Settings )----------------------------------------------------------- */


	public function getUserSetting($key) {
	// NOTE: We store available keys and cached values separately to make it
	// faster to check for `null` in the cache, which is common.
	if (isset($this->settingCacheKeys[$key])) {
	return $this->settingCache[$key];
	}

	$settings_key = PhabricatorUserPreferencesCacheType::KEY_PREFERENCES;
	if ($this->getPHID()) {
	$settings = $this->requireCacheData($settings_key);
	} else {
	$settings = array();
	}

	$defaults = PhabricatorSetting::getAllEnabledSettings($this);

	if (array_key_exists($key, $settings)) {
	$value = $settings[$key];

	// Make sure the value is valid before we return it. This makes things
	// more robust when options are changed or removed.
	if (isset($defaults[$key])) {
	try {
	id(clone $defaults[$key])
	->setViewer($this)
	->assertValidValue($value);

	return $this->writeUserSettingCache($key, $value);
	} catch (Exception $ex) {
	// Fall through below and return the default value.
	}
	} else {
	// This is an ad-hoc setting with no controlling object.
	return $this->writeUserSettingCache($key, $value);
	}
	}

	if (isset($defaults[$key])) {
	$value = id(clone $defaults[$key])
	->setViewer($this)
	->getSettingDefaultValue();
	} else {
	$value = null;
	}

	return $this->writeUserSettingCache($key, $value);
	}


	/**
	* Test if a given setting is set to a particular value.
	*
	* @param const Setting key.
	* @param wild Value to compare.
	* @return bool True if the setting has the specified value.
	* @task settings
	*/
	public function compareUserSetting($key, $value) {
	$actual = $this->getUserSetting($key);
	return ($actual == $value);
	}

	private function writeUserSettingCache($key, $value) {
	$this->settingCacheKeys[$key] = true;
	$this->settingCache[$key] = $value;
	return $value;
	}

	public function getTranslation() {
	return $this->getUserSetting(PhabricatorTranslationSetting::SETTINGKEY);
	}

	public function getTimezoneIdentifier() {
	return $this->getUserSetting(PhabricatorTimezoneSetting::SETTINGKEY);
	}


	/**
	* Override the user's timezone identifier.
	*
	* This is primarily useful for unit tests.
	*
	* @param string New timezone identifier.
	* @return this
	* @task settings
	*/
	public function overrideTimezoneIdentifier($identifier) {
	$timezone_key = PhabricatorTimezoneSetting::SETTINGKEY;
	$this->settingCacheKeys[$timezone_key] = true;
	$this->settingCache[$timezone_key] = $identifier;
	return $this;
	}

	public function getSex() {
	return $this->getUserSetting(PhabricatorPronounSetting::SETTINGKEY);
	}

	public function loadEditorLink(
	$path,
	$line,
	PhabricatorRepository $repository = null) {

	$editor = $this->getUserSetting(PhabricatorEditorSetting::SETTINGKEY);

	if (is_array($path)) {
	$multi_key = PhabricatorEditorMultipleSetting::SETTINGKEY;
	$multiedit = $this->getUserSetting($multi_key);
	switch ($multiedit) {
	case PhabricatorEditorMultipleSetting::VALUE_SPACES:
	$path = implode(' ', $path);
	break;
	case PhabricatorEditorMultipleSetting::VALUE_SINGLE:
	default:
	return null;
	}
	}

	if (!strlen($editor)) {
	return null;
	}

	if ($repository) {
	$callsign = $repository->getCallsign();
	} else {
	$callsign = null;
	}

	$uri = strtr($editor, array(
	'%%' => '%',
	'%f' => phutil_escape_uri($path),
	'%l' => phutil_escape_uri($line),
	'%r' => phutil_escape_uri($callsign),
	));

	// The resulting URI must have an allowed protocol. Otherwise, we'll return
	// a link to an error page explaining the misconfiguration.

	$ok = PhabricatorHelpEditorProtocolController::hasAllowedProtocol($uri);
	if (!$ok) {
	return '/help/editorprotocol/';
	}

	return (string)$uri;
	}

	public function getAlternateCSRFString() {
	return $this->assertAttached($this->alternateCSRFString);
	}

	public function attachAlternateCSRFString($string) {
	$this->alternateCSRFString = $string;
	return $this;
	}

	/**
	* Populate the nametoken table, which used to fetch typeahead results. When
	* a user types "linc", we want to match "Abraham Lincoln" from on-demand
	* typeahead sources. To do this, we need a separate table of name fragments.
	*/
	public function updateNameTokens() {
	$table = self::NAMETOKEN_TABLE;
	$conn_w = $this->establishConnection('w');

	$tokens = PhabricatorTypeaheadDatasource::tokenizeString(
	$this->getUserName().' '.$this->getRealName());

	$sql = array();
	foreach ($tokens as $token) {
	$sql[] = qsprintf(
	$conn_w,
	'(%d, %s)',
	$this->getID(),
	$token);
	}

	queryfx(
	$conn_w,
	'DELETE FROM %T WHERE userID = %d',
	$table,
	$this->getID());
	if ($sql) {
	queryfx(
	$conn_w,
	'INSERT INTO %T (userID, token) VALUES %Q',
	$table,
	implode(', ', $sql));
	}
	}

	public function sendWelcomeEmail(PhabricatorUser $admin) {
	if (!$this->canEstablishWebSessions()) {
	throw new Exception(
	pht(
	'Can not send welcome mail to users who can not establish '.
	'web sessions!'));
	}

	$admin_username = $admin->getUserName();
	$admin_realname = $admin->getRealName();
	$user_username = $this->getUserName();
	$is_serious = PhabricatorEnv::getEnvConfig('phabricator.serious-business');

	$base_uri = PhabricatorEnv::getProductionURI('/');

	$engine = new PhabricatorAuthSessionEngine();
	$uri = $engine->getOneTimeLoginURI(
	$this,
	$this->loadPrimaryEmail(),
	PhabricatorAuthSessionEngine::ONETIME_WELCOME);

	$body = pht(
	"Welcome to Phabricator!\n\n".
	"%s (%s) has created an account for you.\n\n".
	" Username: %s\n\n".
	"To login to Phabricator, follow this link and set a password:\n\n".
	" %s\n\n".
	"After you have set a password, you can login in the future by ".
	"going here:\n\n".
	" %s\n",
	$admin_username,
	$admin_realname,
	$user_username,
	$uri,
	$base_uri);

	if (!$is_serious) {
	$body .= sprintf(
	"\n%s\n",
	pht("Love,\nPhabricator"));
	}

	$mail = id(new PhabricatorMetaMTAMail())
	->addTos(array($this->getPHID()))
	->setForceDelivery(true)
	->setSubject(pht('[Phabricator] Welcome to Phabricator'))
	->setBody($body)
	->saveAndSend();
	}

	public function sendUsernameChangeEmail(
	PhabricatorUser $admin,
	$old_username) {

	$admin_username = $admin->getUserName();
	$admin_realname = $admin->getRealName();
	$new_username = $this->getUserName();

	$password_instructions = null;
	if (PhabricatorPasswordAuthProvider::getPasswordProvider()) {
	$engine = new PhabricatorAuthSessionEngine();
	$uri = $engine->getOneTimeLoginURI(
	$this,
	null,
	PhabricatorAuthSessionEngine::ONETIME_USERNAME);
	$password_instructions = sprintf(
	"%s\n\n %s\n\n%s\n",
	pht(
	"If you use a password to login, you'll need to reset it ".
	"before you can login again. You can reset your password by ".
	"following this link:"),
	$uri,
	pht(
	"And, of course, you'll need to use your new username to login ".
	"from now on. If you use OAuth to login, nothing should change."));
	}

	$body = sprintf(
	"%s\n\n %s\n %s\n\n%s",
	pht(
	'%s (%s) has changed your Phabricator username.',
	$admin_username,
	$admin_realname),
	pht(
	'Old Username: %s',
	$old_username),
	pht(
	'New Username: %s',
	$new_username),
	$password_instructions);

	$mail = id(new PhabricatorMetaMTAMail())
	->addTos(array($this->getPHID()))
	->setForceDelivery(true)
	->setSubject(pht('[Phabricator] Username Changed'))
	->setBody($body)
	->saveAndSend();
	}

	public static function describeValidUsername() {
	return pht(
	'Usernames must contain only numbers, letters, period, underscore and '.
	'hyphen, and can not end with a period. They must have no more than %d '.
	'characters.',
	new PhutilNumber(self::MAXIMUM_USERNAME_LENGTH));
	}

	public static function validateUsername($username) {
	// NOTE: If you update this, make sure to update:
	//
	// - Remarkup rule for @mentions.
	// - Routing rule for "/p/username/".
	// - Unit tests, obviously.
	// - describeValidUsername() method, above.

	if (strlen($username) > self::MAXIMUM_USERNAME_LENGTH) {
	return false;
	}

	return (bool)preg_match('/^[a-zA-Z0-9._-]*[a-zA-Z0-9_-]\z/', $username);
	}

	public static function getDefaultProfileImageURI() {
	return celerity_get_resource_uri('/rsrc/image/avatar.png');
	}

	public function getProfileImageURI() {
	$uri_key = PhabricatorUserProfileImageCacheType::KEY_URI;
	return $this->requireCacheData($uri_key);
	}

	public function getUnreadNotificationCount() {
	$notification_key = PhabricatorUserNotificationCountCacheType::KEY_COUNT;
	return $this->requireCacheData($notification_key);
	}

	public function getUnreadMessageCount() {
	$message_key = PhabricatorUserMessageCountCacheType::KEY_COUNT;
	return $this->requireCacheData($message_key);
	}

	public function getFullName() {
	if (strlen($this->getRealName())) {
	return $this->getUsername().' ('.$this->getRealName().')';
	} else {
	return $this->getUsername();
	}
	}

	public function getTimeZone() {
	return new DateTimeZone($this->getTimezoneIdentifier());
	}

	public function getTimeZoneOffset() {
	$timezone = $this->getTimeZone();
	$now = new DateTime('@'.PhabricatorTime::getNow());
	$offset = $timezone->getOffset($now);

	// Javascript offsets are in minutes and have the opposite sign.
	$offset = -(int)($offset / 60);

	return $offset;
	}

	public function formatShortDateTime($when, $now = null) {
	if ($now === null) {
	$now = PhabricatorTime::getNow();
	}

	try {
	$when = new DateTime('@'.$when);
	$now = new DateTime('@'.$now);
	} catch (Exception $ex) {
	return null;
	}

	$zone = $this->getTimeZone();

	$when->setTimeZone($zone);
	$now->setTimeZone($zone);

	if ($when->format('Y') !== $now->format('Y')) {
	// Different year, so show "Feb 31 2075".
	$format = 'M j Y';
	} else if ($when->format('Ymd') !== $now->format('Ymd')) {
	// Same year but different month and day, so show "Feb 31".
	$format = 'M j';
	} else {
	// Same year, month and day so show a time of day.
	$pref_time = PhabricatorTimeFormatSetting::SETTINGKEY;
	$format = $this->getUserSetting($pref_time);
	}

	return $when->format($format);
	}

	public function __toString() {
	return $this->getUsername();
	}

	public static function loadOneWithEmailAddress($address) {
	$email = id(new PhabricatorUserEmail())->loadOneWhere(
	'address = %s',
	$address);
	if (!$email) {
	return null;
	}
	return id(new PhabricatorUser())->loadOneWhere(
	'phid = %s',
	$email->getUserPHID());
	}

	public function getDefaultSpacePHID() {
	// TODO: We might let the user switch which space they're "in" later on;
	// for now just use the global space if one exists.

	// If the viewer has access to the default space, use that.
	$spaces = PhabricatorSpacesNamespaceQuery::getViewerActiveSpaces($this);
	foreach ($spaces as $space) {
	if ($space->getIsDefaultNamespace()) {
	return $space->getPHID();
	}
	}

	// Otherwise, use the space with the lowest ID that they have access to.
	// This just tends to keep the default stable and predictable over time,
	// so adding a new space won't change behavior for users.
	if ($spaces) {
	$spaces = msort($spaces, 'getID');
	return head($spaces)->getPHID();
	}

	return null;
	}


	/**
	* Grant a user a source of authority, to let them bypass policy checks they
	* could not otherwise.
	*/
	public function grantAuthority($authority) {
	$this->authorities[] = $authority;
	return $this;
	}


	/**
	* Get authorities granted to the user.
	*/
	public function getAuthorities() {
	return $this->authorities;
	}


	/* -( Availability )------------------------------------------------------- */


	/**
	* @task availability
	*/
	public function attachAvailability(array $availability) {
	$this->availability = $availability;
	return $this;
	}


	/**
	* Get the timestamp the user is away until, if they are currently away.
	*
	* @return int\|null Epoch timestamp, or `null` if the user is not away.
	* @task availability
	*/
	public function getAwayUntil() {
	$availability = $this->availability;

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

	return idx($availability, 'until');
	}


	/**
	* Describe the user's availability.
	*
	* @param PhabricatorUser Viewing user.
	* @return string Human-readable description of away status.
	* @task availability
	*/
	public function getAvailabilityDescription(PhabricatorUser $viewer) {
	$until = $this->getAwayUntil();
	if ($until) {
	return pht('Away until %s', phabricator_datetime($until, $viewer));
	} else {
	return pht('Available');
	}
	}


	/**
	* Get cached availability, if present.
	*
	* @return wild\|null Cache data, or null if no cache is available.
	* @task availability
	*/
	public function getAvailabilityCache() {
	$now = PhabricatorTime::getNow();
	if ($this->availabilityCacheTTL <= $now) {
	return null;
	}

	try {
	return phutil_json_decode($this->availabilityCache);
	} catch (Exception $ex) {
	return null;
	}
	}


	/**
	* Write to the availability cache.
	*
	* @param wild Availability cache data.
	* @param int\|null Cache TTL.
	* @return this
	* @task availability
	*/
	public function writeAvailabilityCache(array $availability, $ttl) {
	if (PhabricatorEnv::isReadOnly()) {
	return $this;
	}

	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	queryfx(
	$this->establishConnection('w'),
	'UPDATE %T SET availabilityCache = %s, availabilityCacheTTL = %nd
	WHERE id = %d',
	$this->getTableName(),
	json_encode($availability),
	$ttl,
	$this->getID());
	unset($unguarded);

	return $this;
	}


	/* -( Multi-Factor Authentication )---------------------------------------- */


	/**
	* Update the flag storing this user's enrollment in multi-factor auth.
	*
	* With certain settings, we need to check if a user has MFA on every page,
	* so we cache MFA enrollment on the user object for performance. Calling this
	* method synchronizes the cache by examining enrollment records. After
	* updating the cache, use @{method:getIsEnrolledInMultiFactor} to check if
	* the user is enrolled.
	*
	* This method should be called after any changes are made to a given user's
	* multi-factor configuration.
	*
	* @return void
	* @task factors
	*/
	public function updateMultiFactorEnrollment() {
	$factors = id(new PhabricatorAuthFactorConfig())->loadAllWhere(
	'userPHID = %s',
	$this->getPHID());

	$enrolled = count($factors) ? 1 : 0;
	if ($enrolled !== $this->isEnrolledInMultiFactor) {
	$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
	queryfx(
	$this->establishConnection('w'),
	'UPDATE %T SET isEnrolledInMultiFactor = %d WHERE id = %d',
	$this->getTableName(),
	$enrolled,
	$this->getID());
	unset($unguarded);

	$this->isEnrolledInMultiFactor = $enrolled;
	}
	}


	/**
	* Check if the user is enrolled in multi-factor authentication.
	*
	* Enrolled users have one or more multi-factor authentication sources
	* attached to their account. For performance, this value is cached. You
	* can use @{method:updateMultiFactorEnrollment} to update the cache.
	*
	* @return bool True if the user is enrolled.
	* @task factors
	*/
	public function getIsEnrolledInMultiFactor() {
	return $this->isEnrolledInMultiFactor;
	}


	/* -( Omnipotence )-------------------------------------------------------- */


	/**
	* Returns true if this user is omnipotent. Omnipotent users bypass all policy
	* checks.
	*
	* @return bool True if the user bypasses policy checks.
	*/
	public function isOmnipotent() {
	return $this->omnipotent;
	}


	/**
	* Get an omnipotent user object for use in contexts where there is no acting
	* user, notably daemons.
	*
	* @return PhabricatorUser An omnipotent user.
	*/
	public static function getOmnipotentUser() {
	static $user = null;
	if (!$user) {
	$user = new PhabricatorUser();
	$user->omnipotent = true;
	$user->makeEphemeral();
	}
	return $user;
	}


	/**
	* Get a scalar string identifying this user.
	*
	* This is similar to using the PHID, but distinguishes between ominpotent
	* and public users explicitly. This allows safe construction of cache keys
	* or cache buckets which do not conflate public and omnipotent users.
	*
	* @return string Scalar identifier.
	*/
	public function getCacheFragment() {
	if ($this->isOmnipotent()) {
	return 'u.omnipotent';
	}

	$phid = $this->getPHID();
	if ($phid) {
	return 'u.'.$phid;
	}

	return 'u.public';
	}


	/* -( Managing Handles )--------------------------------------------------- */


	/**
	* Get a @{class:PhabricatorHandleList} which benefits from this viewer's
	* internal handle pool.
	*
	* @param list<phid> List of PHIDs to load.
	* @return PhabricatorHandleList Handle list object.
	* @task handle
	*/
	public function loadHandles(array $phids) {
	if ($this->handlePool === null) {
	$this->handlePool = id(new PhabricatorHandlePool())
	->setViewer($this);
	}

	return $this->handlePool->newHandleList($phids);
	}


	/**
	* Get a @{class:PHUIHandleView} for a single handle.
	*
	* This benefits from the viewer's internal handle pool.
	*
	* @param phid PHID to render a handle for.
	* @return PHUIHandleView View of the handle.
	* @task handle
	*/
	public function renderHandle($phid) {
	return $this->loadHandles(array($phid))->renderHandle($phid);
	}


	/**
	* Get a @{class:PHUIHandleListView} for a list of handles.
	*
	* This benefits from the viewer's internal handle pool.
	*
	* @param list<phid> List of PHIDs to render.
	* @return PHUIHandleListView View of the handles.
	* @task handle
	*/
	public function renderHandleList(array $phids) {
	return $this->loadHandles($phids)->renderList();
	}

	public function attachBadgePHIDs(array $phids) {
	$this->badgePHIDs = $phids;
	return $this;
	}

	public function getBadgePHIDs() {
	return $this->assertAttached($this->badgePHIDs);
	}


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


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

	public function getPolicy($capability) {
	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_VIEW:
	return PhabricatorPolicies::POLICY_PUBLIC;
	case PhabricatorPolicyCapability::CAN_EDIT:
	if ($this->getIsSystemAgent() \|\| $this->getIsMailingList()) {
	return PhabricatorPolicies::POLICY_ADMIN;
	} else {
	return PhabricatorPolicies::POLICY_NOONE;
	}
	}
	}

	public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
	return $this->getPHID() && ($viewer->getPHID() === $this->getPHID());
	}

	public function describeAutomaticCapability($capability) {
	switch ($capability) {
	case PhabricatorPolicyCapability::CAN_EDIT:
	return pht('Only you can edit your information.');
	default:
	return null;
	}
	}


	/* -( PhabricatorCustomFieldInterface )------------------------------------ */


	public function getCustomFieldSpecificationForRole($role) {
	return PhabricatorEnv::getEnvConfig('user.fields');
	}

	public function getCustomFieldBaseClass() {
	return 'PhabricatorUserCustomField';
	}

	public function getCustomFields() {
	return $this->assertAttached($this->customFields);
	}

	public function attachCustomFields(PhabricatorCustomFieldAttachment $fields) {
	$this->customFields = $fields;
	return $this;
	}


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


	public function destroyObjectPermanently(
	PhabricatorDestructionEngine $engine) {

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

	$externals = id(new PhabricatorExternalAccount())->loadAllWhere(
	'userPHID = %s',
	$this->getPHID());
	foreach ($externals as $external) {
	$external->delete();
	}

	$prefs = id(new PhabricatorUserPreferencesQuery())
	->setViewer($engine->getViewer())
	->withUsers(array($this))
	->execute();
	foreach ($prefs as $pref) {
	$engine->destroyObject($pref);
	}

	$profiles = id(new PhabricatorUserProfile())->loadAllWhere(
	'userPHID = %s',
	$this->getPHID());
	foreach ($profiles as $profile) {
	$profile->delete();
	}

	$keys = id(new PhabricatorAuthSSHKeyQuery())
	->setViewer($engine->getViewer())
	->withObjectPHIDs(array($this->getPHID()))
	->execute();
	foreach ($keys as $key) {
	$engine->destroyObject($key);
	}

	$emails = id(new PhabricatorUserEmail())->loadAllWhere(
	'userPHID = %s',
	$this->getPHID());
	foreach ($emails as $email) {
	$email->delete();
	}

	$sessions = id(new PhabricatorAuthSession())->loadAllWhere(
	'userPHID = %s',
	$this->getPHID());
	foreach ($sessions as $session) {
	$session->delete();
	}

	$factors = id(new PhabricatorAuthFactorConfig())->loadAllWhere(
	'userPHID = %s',
	$this->getPHID());
	foreach ($factors as $factor) {
	$factor->delete();
	}

	$this->saveTransaction();
	}


	/* -( PhabricatorSSHPublicKeyInterface )----------------------------------- */


	public function getSSHPublicKeyManagementURI(PhabricatorUser $viewer) {
	if ($viewer->getPHID() == $this->getPHID()) {
	// If the viewer is managing their own keys, take them to the normal
	// panel.
	return '/settings/panel/ssh/';
	} else {
	// Otherwise, take them to the administrative panel for this user.
	return '/settings/'.$this->getID().'/panel/ssh/';
	}
	}

	public function getSSHKeyDefaultName() {
	return 'id_rsa_phabricator';
	}

	public function getSSHKeyNotifyPHIDs() {
	return array(
	$this->getPHID(),
	);
	}


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


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

	public function getApplicationTransactionObject() {
	return $this;
	}

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

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


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


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


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


	public function getFieldSpecificationsForConduit() {
	return array(
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('username')
	->setType('string')
	->setDescription(pht("The user's username.")),
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('realName')
	->setType('string')
	->setDescription(pht("The user's real name.")),
	id(new PhabricatorConduitSearchFieldSpecification())
	->setKey('roles')
	->setType('list<string>')
	->setDescription(pht('List of acccount roles.')),
	);
	}

	public function getFieldValuesForConduit() {
	$roles = array();

	if ($this->getIsDisabled()) {
	$roles[] = 'disabled';
	}

	if ($this->getIsSystemAgent()) {
	$roles[] = 'bot';
	}

	if ($this->getIsMailingList()) {
	$roles[] = 'list';
	}

	if ($this->getIsAdmin()) {
	$roles[] = 'admin';
	}

	if ($this->getIsEmailVerified()) {
	$roles[] = 'verified';
	}

	if ($this->getIsApproved()) {
	$roles[] = 'approved';
	}

	if ($this->isUserActivated()) {
	$roles[] = 'activated';
	}

	return array(
	'username' => $this->getUsername(),
	'realName' => $this->getRealName(),
	'roles' => $roles,
	);
	}

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


	/* -( User Cache )--------------------------------------------------------- */


	/**
	* @task cache
	*/
	public function attachRawCacheData(array $data) {
	$this->rawCacheData = $data + $this->rawCacheData;
	return $this;
	}

	public function setAllowInlineCacheGeneration($allow_cache_generation) {
	$this->allowInlineCacheGeneration = $allow_cache_generation;
	return $this;
	}

	/**
	* @task cache
	*/
	protected function requireCacheData($key) {
	if (isset($this->usableCacheData[$key])) {
	return $this->usableCacheData[$key];
	}

	$type = PhabricatorUserCacheType::requireCacheTypeForKey($key);

	if (isset($this->rawCacheData[$key])) {
	$raw_value = $this->rawCacheData[$key];

	$usable_value = $type->getValueFromStorage($raw_value);
	$this->usableCacheData[$key] = $usable_value;

	return $usable_value;
	}

	// By default, we throw if a cache isn't available. This is consistent
	// with the standard `needX()` + `attachX()` + `getX()` interaction.
	if (!$this->allowInlineCacheGeneration) {
	throw new PhabricatorDataNotAttachedException($this);
	}

	$usable_value = $type->getDefaultValue();

	$user_phid = $this->getPHID();
	if ($user_phid) {
	$map = $type->newValueForUsers($key, array($this));
	if (array_key_exists($user_phid, $map)) {
	- $usable_value = $map[$user_phid];
	- $raw_value = $type->getValueForStorage($usable_value);
	+ $raw_value = $map[$user_phid];
	$usable_value = $type->getValueFromStorage($raw_value);

	$this->rawCacheData[$key] = $raw_value;
	PhabricatorUserCache::writeCache(
	$type,
	$key,
	$user_phid,
	$raw_value);
	}
	}

	$this->usableCacheData[$key] = $usable_value;

	return $usable_value;
	}


	/**
	* @task cache
	*/
	public function clearCacheData($key) {
	unset($this->rawCacheData[$key]);
	unset($this->usableCacheData[$key]);
	return $this;
	}

	}

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