1 files changed, 310 insertions, 238 deletions

diff --git a/lib/private/Accounts/AccountManager.php b/lib/private/Accounts/AccountManager.php
index 5792ba1dc5d..d00b1d2e9a3 100644
--- a/lib/private/Accounts/AccountManager.php
+++ b/lib/private/Accounts/AccountManager.php
@@ -1,69 +1,42 @@
 <?php
 
 /**
- * @copyright Copyright (c) 2016, ownCloud, Inc.
- * @copyright Copyright (c) 2016, Björn Schießle
- *
- * @author Bjoern Schiessle <bjoern@schiessle.org>
- * @author Björn Schießle <bjoern@schiessle.org>
- * @author Christoph Wurst <christoph@winzerhof-wurst.at>
- * @author Daniel Calviño Sánchez <danxuliu@gmail.com>
- * @author Daniel Kesselberg <mail@danielkesselberg.de>
- * @author Joas Schilling <coding@schilljs.com>
- * @author Julius Härtl <jus@bitgrid.net>
- * @author Lukas Reschke <lukas@statuscode.ch>
- * @author Morris Jobke <hey@morrisjobke.de>
- * @author Roeland Jago Douma <roeland@famdouma.nl>
- * @author Vincent Petry <vincent@nextcloud.com>
- *
- * @license AGPL-3.0
- *
- * This code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License, version 3,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License, version 3,
- * along with this program. If not, see <http://www.gnu.org/licenses/>
- *
+ * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
+ * SPDX-License-Identifier: AGPL-3.0-only
  */
 
 namespace OC\Accounts;
 
 use Exception;
 use InvalidArgumentException;
-use libphonenumber\NumberParseException;
-use libphonenumber\PhoneNumber;
-use libphonenumber\PhoneNumberFormat;
-use libphonenumber\PhoneNumberUtil;
 use OC\Profile\TProfileHelper;
-use OC\Cache\CappedMemoryCache;
 use OCA\Settings\BackgroundJobs\VerifyUserData;
 use OCP\Accounts\IAccount;
 use OCP\Accounts\IAccountManager;
 use OCP\Accounts\IAccountProperty;
 use OCP\Accounts\IAccountPropertyCollection;
 use OCP\Accounts\PropertyDoesNotExistException;
+use OCP\Accounts\UserUpdatedEvent;
 use OCP\BackgroundJob\IJobList;
+use OCP\Cache\CappedMemoryCache;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\Defaults;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Http\Client\IClientService;
 use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\IL10N;
+use OCP\IPhoneNumberUtil;
 use OCP\IURLGenerator;
 use OCP\IUser;
 use OCP\L10N\IFactory;
 use OCP\Mail\IMailer;
 use OCP\Security\ICrypto;
 use OCP\Security\VerificationToken\IVerificationToken;
+use OCP\User\Backend\IGetDisplayNameBackend;
 use OCP\Util;
 use Psr\Log\LoggerInterface;
-use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\EventDispatcher\GenericEvent;
 use function array_flip;
 use function iterator_to_array;
 use function json_decode;
@@ -83,116 +56,48 @@ class AccountManager implements IAccountManager {
 
 	use TProfileHelper;
 
-	/** @var  IDBConnection database connection */
-	private $connection;
-
-	/** @var IConfig */
-	private $config;
-
-	/** @var string table name */
-	private $table = 'accounts';
-
-	/** @var string table name */
-	private $dataTable = 'accounts_data';
-
-	/** @var EventDispatcherInterface */
-	private $eventDispatcher;
-
-	/** @var IJobList */
-	private $jobList;
-
-	/** @var LoggerInterface */
-	private $logger;
-	/** @var IVerificationToken */
-	private $verificationToken;
-	/** @var IMailer */
-	private $mailer;
-	/** @var Defaults */
-	private $defaults;
-	/** @var IL10N */
-	private $l10n;
-	/** @var IURLGenerator */
-	private $urlGenerator;
-	/** @var ICrypto */
-	private $crypto;
-	/** @var IFactory */
-	private $l10nfactory;
+	private string $table = 'accounts';
+	private string $dataTable = 'accounts_data';
+	private ?IL10N $l10n = null;
 	private CappedMemoryCache $internalCache;
 
-	public function __construct(
-		IDBConnection            $connection,
-		IConfig                  $config,
-		EventDispatcherInterface $eventDispatcher,
-		IJobList                 $jobList,
-		LoggerInterface          $logger,
-		IVerificationToken       $verificationToken,
-		IMailer                  $mailer,
-		Defaults                 $defaults,
-		IFactory                 $factory,
-		IURLGenerator            $urlGenerator,
-		ICrypto                  $crypto
-	) {
-		$this->connection = $connection;
-		$this->config = $config;
-		$this->eventDispatcher = $eventDispatcher;
-		$this->jobList = $jobList;
-		$this->logger = $logger;
-		$this->verificationToken = $verificationToken;
-		$this->mailer = $mailer;
-		$this->defaults = $defaults;
-		$this->urlGenerator = $urlGenerator;
-		$this->crypto = $crypto;
-		// DIing IL10N results in a dependency loop
-		$this->l10nfactory = $factory;
-		$this->internalCache = new CappedMemoryCache();
-	}
-
-	/**
-	 * @param string $input
-	 * @return string Provided phone number in E.164 format when it was a valid number
-	 * @throws InvalidArgumentException When the phone number was invalid or no default region is set and the number doesn't start with a country code
-	 */
-	protected function parsePhoneNumber(string $input): string {
-		$defaultRegion = $this->config->getSystemValueString('default_phone_region', '');
-
-		if ($defaultRegion === '') {
-			// When no default region is set, only +49… numbers are valid
-			if (strpos($input, '+') !== 0) {
-				throw new InvalidArgumentException(self::PROPERTY_PHONE);
-			}
-
-			$defaultRegion = 'EN';
-		}
-
-		$phoneUtil = PhoneNumberUtil::getInstance();
-		try {
-			$phoneNumber = $phoneUtil->parse($input, $defaultRegion);
-			if ($phoneNumber instanceof PhoneNumber && $phoneUtil->isValidNumber($phoneNumber)) {
-				return $phoneUtil->format($phoneNumber, PhoneNumberFormat::E164);
-			}
-		} catch (NumberParseException $e) {
-		}
-
-		throw new InvalidArgumentException(self::PROPERTY_PHONE);
-	}
-
 	/**
-	 *
-	 * @param string $input
-	 * @return string
-	 * @throws InvalidArgumentException When the website did not have http(s) as protocol or the host name was empty
+	 * The list of default scopes for each property.
 	 */
-	protected function parseWebsite(string $input): string {
-		$parts = parse_url($input);
-		if (!isset($parts['scheme']) || ($parts['scheme'] !== 'https' && $parts['scheme'] !== 'http')) {
-			throw new InvalidArgumentException(self::PROPERTY_WEBSITE);
-		}
-
-		if (!isset($parts['host']) || $parts['host'] === '') {
-			throw new InvalidArgumentException(self::PROPERTY_WEBSITE);
-		}
+	public const DEFAULT_SCOPES = [
+		self::PROPERTY_ADDRESS => self::SCOPE_LOCAL,
+		self::PROPERTY_AVATAR => self::SCOPE_FEDERATED,
+		self::PROPERTY_BIOGRAPHY => self::SCOPE_LOCAL,
+		self::PROPERTY_BIRTHDATE => self::SCOPE_LOCAL,
+		self::PROPERTY_DISPLAYNAME => self::SCOPE_FEDERATED,
+		self::PROPERTY_EMAIL => self::SCOPE_FEDERATED,
+		self::PROPERTY_FEDIVERSE => self::SCOPE_LOCAL,
+		self::PROPERTY_HEADLINE => self::SCOPE_LOCAL,
+		self::PROPERTY_ORGANISATION => self::SCOPE_LOCAL,
+		self::PROPERTY_PHONE => self::SCOPE_LOCAL,
+		self::PROPERTY_PRONOUNS => self::SCOPE_FEDERATED,
+		self::PROPERTY_ROLE => self::SCOPE_LOCAL,
+		self::PROPERTY_TWITTER => self::SCOPE_LOCAL,
+		self::PROPERTY_BLUESKY => self::SCOPE_LOCAL,
+		self::PROPERTY_WEBSITE => self::SCOPE_LOCAL,
+	];
 
-		return $input;
+	public function __construct(
+		private IDBConnection $connection,
+		private IConfig $config,
+		private IEventDispatcher $dispatcher,
+		private IJobList $jobList,
+		private LoggerInterface $logger,
+		private IVerificationToken $verificationToken,
+		private IMailer $mailer,
+		private Defaults $defaults,
+		private IFactory $l10nFactory,
+		private IURLGenerator $urlGenerator,
+		private ICrypto $crypto,
+		private IPhoneNumberUtil $phoneNumberUtil,
+		private IClientService $clientService,
+	) {
+		$this->internalCache = new CappedMemoryCache();
 	}
 
 	/**
@@ -202,7 +107,7 @@ class AccountManager implements IAccountManager {
 		foreach ($properties as $property) {
 			if (strlen($property->getValue()) > 2048) {
 				if ($throwOnData) {
-					throw new InvalidArgumentException();
+					throw new InvalidArgumentException($property->getName());
 				} else {
 					$property->setValue('');
 				}
@@ -227,64 +132,29 @@ class AccountManager implements IAccountManager {
 				$property->setScope(self::SCOPE_LOCAL);
 			}
 		} else {
-			// migrate scope values to the new format
-			// invalid scopes are mapped to a default value
-			$property->setScope(AccountProperty::mapScopeToV2($property->getScope()));
+			$property->setScope($property->getScope());
 		}
 	}
 
-	protected function sanitizePhoneNumberValue(IAccountProperty $property, bool $throwOnData = false) {
-		if ($property->getName() !== self::PROPERTY_PHONE) {
-			if ($throwOnData) {
-				throw new InvalidArgumentException(sprintf('sanitizePhoneNumberValue can only sanitize phone numbers, %s given', $property->getName()));
-			}
-			return;
+	protected function updateUser(IUser $user, array $data, ?array $oldUserData, bool $throwOnData = false): array {
+		if ($oldUserData === null) {
+			$oldUserData = $this->getUser($user, false);
 		}
-		if ($property->getValue() === '') {
-			return;
-		}
-		try {
-			$property->setValue($this->parsePhoneNumber($property->getValue()));
-		} catch (InvalidArgumentException $e) {
-			if ($throwOnData) {
-				throw $e;
-			}
-			$property->setValue('');
-		}
-	}
-
-	protected function sanitizeWebsite(IAccountProperty $property, bool $throwOnData = false) {
-		if ($property->getName() !== self::PROPERTY_WEBSITE) {
-			if ($throwOnData) {
-				throw new InvalidArgumentException(sprintf('sanitizeWebsite can only sanitize web domains, %s given', $property->getName()));
-			}
-		}
-		try {
-			$property->setValue($this->parseWebsite($property->getValue()));
-		} catch (InvalidArgumentException $e) {
-			if ($throwOnData) {
-				throw $e;
-			}
-			$property->setValue('');
-		}
-	}
 
-	protected function updateUser(IUser $user, array $data, bool $throwOnData = false): array {
-		$oldUserData = $this->getUser($user, false);
 		$updated = true;
 
 		if ($oldUserData !== $data) {
-			$this->updateExistingUser($user, $data);
+			$this->updateExistingUser($user, $data, $oldUserData);
 		} else {
 			// nothing needs to be done if new and old data set are the same
 			$updated = false;
 		}
 
 		if ($updated) {
-			$this->eventDispatcher->dispatch(
-				'OC\AccountManager::userUpdated',
-				new GenericEvent($user, $data)
-			);
+			$this->dispatcher->dispatchTyped(new UserUpdatedEvent(
+				$user,
+				$data,
+			));
 		}
 
 		return $data;
@@ -292,30 +162,26 @@ class AccountManager implements IAccountManager {
 
 	/**
 	 * delete user from accounts table
-	 *
-	 * @param IUser $user
 	 */
-	public function deleteUser(IUser $user) {
+	public function deleteUser(IUser $user): void {
 		$uid = $user->getUID();
 		$query = $this->connection->getQueryBuilder();
 		$query->delete($this->table)
 			->where($query->expr()->eq('uid', $query->createNamedParameter($uid)))
-			->execute();
+			->executeStatement();
 
 		$this->deleteUserData($user);
 	}
 
 	/**
 	 * delete user from accounts table
-	 *
-	 * @param IUser $user
 	 */
 	public function deleteUserData(IUser $user): void {
 		$uid = $user->getUID();
 		$query = $this->connection->getQueryBuilder();
 		$query->delete($this->dataTable)
 			->where($query->expr()->eq('uid', $query->createNamedParameter($uid)))
-			->execute();
+			->executeStatement();
 	}
 
 	/**
@@ -377,12 +243,10 @@ class AccountManager implements IAccountManager {
 	}
 
 	protected function searchUsersForRelatedCollection(string $property, array $values): array {
-		switch ($property) {
-			case IAccountManager::PROPERTY_EMAIL:
-				return array_flip($this->searchUsers(IAccountManager::COLLECTION_EMAIL, $values));
-			default:
-				return [];
-		}
+		return match ($property) {
+			IAccountManager::PROPERTY_EMAIL => array_flip($this->searchUsers(IAccountManager::COLLECTION_EMAIL, $values)),
+			default => [],
+		};
 	}
 
 	/**
@@ -446,7 +310,7 @@ class AccountManager implements IAccountManager {
 		]);
 
 		if (!$this->l10n) {
-			$this->l10n = $this->l10nfactory->get('core');
+			$this->l10n = $this->l10nFactory->get('core');
 		}
 
 		$emailTemplate->setSubject($this->l10n->t('%s email verification', [$this->defaults->getName()]));
@@ -504,6 +368,7 @@ class AccountManager implements IAccountManager {
 	protected function updateVerificationStatus(IAccount $updatedAccount, array $oldData): void {
 		static $propertiesVerifiableByLookupServer = [
 			self::PROPERTY_TWITTER,
+			self::PROPERTY_FEDIVERSE,
 			self::PROPERTY_WEBSITE,
 			self::PROPERTY_EMAIL,
 		];
@@ -530,9 +395,6 @@ class AccountManager implements IAccountManager {
 
 	/**
 	 * add new user to accounts table
-	 *
-	 * @param IUser $user
-	 * @param array $data
 	 */
 	protected function insertNewUser(IUser $user, array $data): void {
 		$uid = $user->getUID();
@@ -601,12 +463,9 @@ class AccountManager implements IAccountManager {
 	}
 
 	/**
-	 * update existing user in accounts table
-	 *
-	 * @param IUser $user
-	 * @param array $data
+	 * Update existing user in accounts table
 	 */
-	protected function updateExistingUser(IUser $user, array $data): void {
+	protected function updateExistingUser(IUser $user, array $data, array $oldData): void {
 		$uid = $user->getUID();
 		$jsonEncodedData = $this->prepareJson($data);
 		$query = $this->connection->getQueryBuilder();
@@ -649,87 +508,116 @@ class AccountManager implements IAccountManager {
 
 	/**
 	 * build default user record in case not data set exists yet
-	 *
-	 * @param IUser $user
-	 * @return array
 	 */
-	protected function buildDefaultUserRecord(IUser $user) {
+	protected function buildDefaultUserRecord(IUser $user): array {
+		$scopes = array_merge(self::DEFAULT_SCOPES, array_filter($this->config->getSystemValue('account_manager.default_property_scope', []), static function (string $scope, string $property) {
+			return in_array($property, self::ALLOWED_PROPERTIES, true) && in_array($scope, self::ALLOWED_SCOPES, true);
+		}, ARRAY_FILTER_USE_BOTH));
+
 		return [
 			[
 				'name' => self::PROPERTY_DISPLAYNAME,
 				'value' => $user->getDisplayName(),
-				'scope' => self::SCOPE_FEDERATED,
+				// Display name must be at least SCOPE_LOCAL
+				'scope' => $scopes[self::PROPERTY_DISPLAYNAME] === self::SCOPE_PRIVATE ? self::SCOPE_LOCAL : $scopes[self::PROPERTY_DISPLAYNAME],
 				'verified' => self::NOT_VERIFIED,
 			],
 
 			[
 				'name' => self::PROPERTY_ADDRESS,
 				'value' => '',
-				'scope' => self::SCOPE_LOCAL,
+				'scope' => $scopes[self::PROPERTY_ADDRESS],
 				'verified' => self::NOT_VERIFIED,
 			],
 
 			[
 				'name' => self::PROPERTY_WEBSITE,
 				'value' => '',
-				'scope' => self::SCOPE_LOCAL,
+				'scope' => $scopes[self::PROPERTY_WEBSITE],
 				'verified' => self::NOT_VERIFIED,
 			],
 
 			[
 				'name' => self::PROPERTY_EMAIL,
 				'value' => $user->getEMailAddress(),
-				'scope' => self::SCOPE_FEDERATED,
+				// Email must be at least SCOPE_LOCAL
+				'scope' => $scopes[self::PROPERTY_EMAIL] === self::SCOPE_PRIVATE ? self::SCOPE_LOCAL : $scopes[self::PROPERTY_EMAIL],
 				'verified' => self::NOT_VERIFIED,
 			],
 
 			[
 				'name' => self::PROPERTY_AVATAR,
-				'scope' => self::SCOPE_FEDERATED
+				'scope' => $scopes[self::PROPERTY_AVATAR],
 			],
 
 			[
 				'name' => self::PROPERTY_PHONE,
 				'value' => '',
-				'scope' => self::SCOPE_LOCAL,
+				'scope' => $scopes[self::PROPERTY_PHONE],
 				'verified' => self::NOT_VERIFIED,
 			],
 
 			[
 				'name' => self::PROPERTY_TWITTER,
 				'value' => '',
-				'scope' => self::SCOPE_LOCAL,
+				'scope' => $scopes[self::PROPERTY_TWITTER],
+				'verified' => self::NOT_VERIFIED,
+			],
+
+			[
+				'name' => self::PROPERTY_BLUESKY,
+				'value' => '',
+				'scope' => $scopes[self::PROPERTY_BLUESKY],
+				'verified' => self::NOT_VERIFIED,
+			],
+
+			[
+				'name' => self::PROPERTY_FEDIVERSE,
+				'value' => '',
+				'scope' => $scopes[self::PROPERTY_FEDIVERSE],
 				'verified' => self::NOT_VERIFIED,
 			],
 
 			[
 				'name' => self::PROPERTY_ORGANISATION,
 				'value' => '',
-				'scope' => self::SCOPE_LOCAL,
+				'scope' => $scopes[self::PROPERTY_ORGANISATION],
 			],
 
 			[
 				'name' => self::PROPERTY_ROLE,
 				'value' => '',
-				'scope' => self::SCOPE_LOCAL,
+				'scope' => $scopes[self::PROPERTY_ROLE],
 			],
 
 			[
 				'name' => self::PROPERTY_HEADLINE,
 				'value' => '',
-				'scope' => self::SCOPE_LOCAL,
+				'scope' => $scopes[self::PROPERTY_HEADLINE],
 			],
 
 			[
 				'name' => self::PROPERTY_BIOGRAPHY,
 				'value' => '',
-				'scope' => self::SCOPE_LOCAL,
+				'scope' => $scopes[self::PROPERTY_BIOGRAPHY],
+			],
+
+			[
+				'name' => self::PROPERTY_BIRTHDATE,
+				'value' => '',
+				'scope' => $scopes[self::PROPERTY_BIRTHDATE],
 			],
 
 			[
 				'name' => self::PROPERTY_PROFILE_ENABLED,
 				'value' => $this->isProfileEnabledByDefault($this->config) ? '1' : '0',
 			],
+
+			[
+				'name' => self::PROPERTY_PRONOUNS,
+				'value' => '',
+				'scope' => $scopes[self::PROPERTY_PRONOUNS],
+			],
 		];
 	}
 
@@ -766,41 +654,225 @@ class AccountManager implements IAccountManager {
 	}
 
 	public function getAccount(IUser $user): IAccount {
-		if ($this->internalCache->hasKey($user->getUID())) {
-			return $this->internalCache->get($user->getUID());
+		$cached = $this->internalCache->get($user->getUID());
+		if ($cached !== null) {
+			return $cached;
 		}
 		$account = $this->parseAccountData($user, $this->getUser($user));
+		if ($user->getBackend() instanceof IGetDisplayNameBackend) {
+			$property = $account->getProperty(self::PROPERTY_DISPLAYNAME);
+			$account->setProperty(self::PROPERTY_DISPLAYNAME, $user->getDisplayName(), $property->getScope(), $property->getVerified());
+		}
 		$this->internalCache->set($user->getUID(), $account);
 		return $account;
 	}
 
+	/**
+	 * Converts value (phone number) in E.164 format when it was a valid number
+	 * @throws InvalidArgumentException When the phone number was invalid or no default region is set and the number doesn't start with a country code
+	 */
+	protected function sanitizePropertyPhoneNumber(IAccountProperty $property): void {
+		$defaultRegion = $this->config->getSystemValueString('default_phone_region', '');
+
+		if ($defaultRegion === '') {
+			// When no default region is set, only +49… numbers are valid
+			if (!str_starts_with($property->getValue(), '+')) {
+				throw new InvalidArgumentException(self::PROPERTY_PHONE);
+			}
+
+			$defaultRegion = 'EN';
+		}
+
+		$phoneNumber = $this->phoneNumberUtil->convertToStandardFormat($property->getValue(), $defaultRegion);
+		if ($phoneNumber === null) {
+			throw new InvalidArgumentException(self::PROPERTY_PHONE);
+		}
+		$property->setValue($phoneNumber);
+	}
+
+	/**
+	 * @throws InvalidArgumentException When the website did not have http(s) as protocol or the host name was empty
+	 */
+	private function sanitizePropertyWebsite(IAccountProperty $property): void {
+		$parts = parse_url($property->getValue());
+		if (!isset($parts['scheme']) || ($parts['scheme'] !== 'https' && $parts['scheme'] !== 'http')) {
+			throw new InvalidArgumentException(self::PROPERTY_WEBSITE);
+		}
+
+		if (!isset($parts['host']) || $parts['host'] === '') {
+			throw new InvalidArgumentException(self::PROPERTY_WEBSITE);
+		}
+	}
+
+	/**
+	 * @throws InvalidArgumentException If the property value is not a valid user handle according to X's rules
+	 */
+	private function sanitizePropertyTwitter(IAccountProperty $property): void {
+		if ($property->getName() === self::PROPERTY_TWITTER) {
+			$matches = [];
+			// twitter handles only contain alpha numeric characters and the underscore and must not be longer than 15 characters
+			if (preg_match('/^@?([a-zA-Z0-9_]{2,15})$/', $property->getValue(), $matches) !== 1) {
+				throw new InvalidArgumentException(self::PROPERTY_TWITTER);
+			}
+
+			// drop the leading @ if any to make it the valid handle
+			$property->setValue($matches[1]);
+
+		}
+	}
+
+	private function validateBlueSkyHandle(string $text): bool {
+		if ($text === '') {
+			return true;
+		}
+
+		$lowerText = strtolower($text);
+
+		if ($lowerText === 'bsky.social') {
+			// "bsky.social" itself is not a valid handle
+			return false;
+		}
+
+		if (str_ends_with($lowerText, '.bsky.social')) {
+			$parts = explode('.', $lowerText);
+
+			// Must be exactly: username.bsky.social → 3 parts
+			if (count($parts) !== 3 || $parts[1] !== 'bsky' || $parts[2] !== 'social') {
+				return false;
+			}
+
+			$username = $parts[0];
+
+			// Must be 3–18 chars, alphanumeric/hyphen, no start/end hyphen
+			return preg_match('/^[a-z0-9][a-z0-9-]{2,17}$/', $username) === 1;
+		}
+
+		// Allow custom domains (Bluesky handle via personal domain)
+		return filter_var($text, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME) !== false;
+	}
+
+
+	private function sanitizePropertyBluesky(IAccountProperty $property): void {
+		if ($property->getName() === self::PROPERTY_BLUESKY) {
+			if (!$this->validateBlueSkyHandle($property->getValue())) {
+				throw new InvalidArgumentException(self::PROPERTY_BLUESKY);
+			}
+
+			$property->setValue($property->getValue());
+		}
+	}
+
+	/**
+	 * @throws InvalidArgumentException If the property value is not a valid fediverse handle (username@instance where instance is a valid domain)
+	 */
+	private function sanitizePropertyFediverse(IAccountProperty $property): void {
+		if ($property->getName() === self::PROPERTY_FEDIVERSE) {
+			$matches = [];
+			if (preg_match('/^@?([^@\s\/\\\]+)@([^\s\/\\\]+)$/', trim($property->getValue()), $matches) !== 1) {
+				throw new InvalidArgumentException(self::PROPERTY_FEDIVERSE);
+			}
+
+			[, $username, $instance] = $matches;
+			$validated = filter_var($instance, FILTER_VALIDATE_DOMAIN, FILTER_FLAG_HOSTNAME);
+			if ($validated !== $instance) {
+				throw new InvalidArgumentException(self::PROPERTY_FEDIVERSE);
+			}
+
+			if ($this->config->getSystemValueBool('has_internet_connection', true)) {
+				$client = $this->clientService->newClient();
+
+				try {
+					// try the public account lookup API of mastodon
+					$response = $client->get("https://{$instance}/.well-known/webfinger?resource=acct:{$username}@{$instance}");
+					// should be a json response with account information
+					$data = $response->getBody();
+					if (is_resource($data)) {
+						$data = stream_get_contents($data);
+					}
+					$decoded = json_decode($data, true);
+					// ensure the username is the same the user passed
+					// in this case we can assume this is a valid fediverse server and account
+					if (!is_array($decoded) || ($decoded['subject'] ?? '') !== "acct:{$username}@{$instance}") {
+						throw new InvalidArgumentException();
+					}
+					// check for activitypub link
+					if (is_array($decoded['links']) && isset($decoded['links'])) {
+						$found = false;
+						foreach ($decoded['links'] as $link) {
+							// have application/activity+json or application/ld+json
+							if (isset($link['type']) && (
+								$link['type'] === 'application/activity+json'
+								|| $link['type'] === 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'
+							)) {
+								$found = true;
+								break;
+							}
+						}
+						if (!$found) {
+							throw new InvalidArgumentException();
+						}
+					}
+				} catch (InvalidArgumentException) {
+					throw new InvalidArgumentException(self::PROPERTY_FEDIVERSE);
+				} catch (\Exception $error) {
+					$this->logger->error('Could not verify fediverse account', ['exception' => $error, 'instance' => $instance]);
+					throw new InvalidArgumentException(self::PROPERTY_FEDIVERSE);
+				}
+			}
+
+			$property->setValue("$username@$instance");
+		}
+	}
+
 	public function updateAccount(IAccount $account): void {
 		$this->testValueLengths(iterator_to_array($account->getAllProperties()), true);
 		try {
 			$property = $account->getProperty(self::PROPERTY_PHONE);
-			$this->sanitizePhoneNumberValue($property);
+			if ($property->getValue() !== '') {
+				$this->sanitizePropertyPhoneNumber($property);
+			}
 		} catch (PropertyDoesNotExistException $e) {
 			//  valid case, nothing to do
 		}
 
 		try {
 			$property = $account->getProperty(self::PROPERTY_WEBSITE);
-			$this->sanitizeWebsite($property);
+			if ($property->getValue() !== '') {
+				$this->sanitizePropertyWebsite($property);
+			}
+		} catch (PropertyDoesNotExistException $e) {
+			//  valid case, nothing to do
+		}
+
+		try {
+			$property = $account->getProperty(self::PROPERTY_TWITTER);
+			if ($property->getValue() !== '') {
+				$this->sanitizePropertyTwitter($property);
+			}
+		} catch (PropertyDoesNotExistException $e) {
+			//  valid case, nothing to do
+		}
+
+		try {
+			$property = $account->getProperty(self::PROPERTY_BLUESKY);
+			if ($property->getValue() !== '') {
+				$this->sanitizePropertyBluesky($property);
+			}
+		} catch (PropertyDoesNotExistException $e) {
+			//  valid case, nothing to do
+		}
+
+		try {
+			$property = $account->getProperty(self::PROPERTY_FEDIVERSE);
+			if ($property->getValue() !== '') {
+				$this->sanitizePropertyFediverse($property);
+			}
 		} catch (PropertyDoesNotExistException $e) {
 			//  valid case, nothing to do
 		}
 
-		static $allowedScopes = [
-			self::SCOPE_PRIVATE,
-			self::SCOPE_LOCAL,
-			self::SCOPE_FEDERATED,
-			self::SCOPE_PUBLISHED,
-			self::VISIBILITY_PRIVATE,
-			self::VISIBILITY_CONTACTS_ONLY,
-			self::VISIBILITY_PUBLIC,
-		];
 		foreach ($account->getAllProperties() as $property) {
-			$this->testPropertyScope($property, $allowedScopes, true);
+			$this->testPropertyScope($property, self::ALLOWED_SCOPES, true);
 		}
 
 		$oldData = $this->getUser($account->getUser(), false);
@@ -820,7 +892,7 @@ class AccountManager implements IAccountManager {
 			];
 		}
 
-		$this->updateUser($account->getUser(), $data, true);
+		$this->updateUser($account->getUser(), $data, $oldData, true);
 		$this->internalCache->set($account->getUser()->getUID(), $account);
 	}
 }