1 files changed, 177 insertions, 0 deletions
diff --git a/apps/dav/lib/Command/MoveCalendar.php b/apps/dav/lib/Command/MoveCalendar.php
new file mode 100644
index 00000000000..b8acc191cc3
--- /dev/null
+++ b/apps/dav/lib/Command/MoveCalendar.php
@@ -0,0 +1,177 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2016 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+namespace OCA\DAV\Command;
+
+use OCA\DAV\CalDAV\CalDavBackend;
+use OCA\DAV\CalDAV\Calendar;
+use OCP\IConfig;
+use OCP\IGroupManager;
+use OCP\IL10N;
+use OCP\IUserManager;
+use OCP\Share\IManager as IShareManager;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+class MoveCalendar extends Command {
+	private ?SymfonyStyle $io = null;
+
+	public const URI_USERS = 'principals/users/';
+
+	public function __construct(
+		private IUserManager $userManager,
+		private IGroupManager $groupManager,
+		private IShareManager $shareManager,
+		private IConfig $config,
+		private IL10N $l10n,
+		private CalDavBackend $calDav,
+		private LoggerInterface $logger,
+	) {
+		parent::__construct();
+	}
+
+	protected function configure(): void {
+		$this
+			->setName('dav:move-calendar')
+			->setDescription('Move a calendar from an user to another')
+			->addArgument('name',
+				InputArgument::REQUIRED,
+				'Name of the calendar to move')
+			->addArgument('sourceuid',
+				InputArgument::REQUIRED,
+				'User who currently owns the calendar')
+			->addArgument('destinationuid',
+				InputArgument::REQUIRED,
+				'User who will receive the calendar')
+			->addOption('force', 'f', InputOption::VALUE_NONE, 'Force the migration by removing existing shares and renaming calendars in case of conflicts');
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int {
+		$userOrigin = $input->getArgument('sourceuid');
+		$userDestination = $input->getArgument('destinationuid');
+
+		$this->io = new SymfonyStyle($input, $output);
+
+		if (!$this->userManager->userExists($userOrigin)) {
+			throw new \InvalidArgumentException("User <$userOrigin> is unknown.");
+		}
+
+		if (!$this->userManager->userExists($userDestination)) {
+			throw new \InvalidArgumentException("User <$userDestination> is unknown.");
+		}
+
+		$name = $input->getArgument('name');
+		$newName = null;
+
+		$calendar = $this->calDav->getCalendarByUri(self::URI_USERS . $userOrigin, $name);
+
+		if ($calendar === null) {
+			throw new \InvalidArgumentException("User <$userOrigin> has no calendar named <$name>. You can run occ dav:list-calendars to list calendars URIs for this user.");
+		}
+
+		// Calendar already exists
+		if ($this->calendarExists($userDestination, $name)) {
+			if ($input->getOption('force')) {
+				// Try to find a suitable name
+				$newName = $this->getNewCalendarName($userDestination, $name);
+
+				// If we didn't find a suitable value after all the iterations, give up
+				if ($this->calendarExists($userDestination, $newName)) {
+					throw new \InvalidArgumentException("Unable to find a suitable calendar name for <$userDestination> with initial name <$name>.");
+				}
+			} else {
+				throw new \InvalidArgumentException("User <$userDestination> already has a calendar named <$name>.");
+			}
+		}
+
+		$hadShares = $this->checkShares($calendar, $userOrigin, $userDestination, $input->getOption('force'));
+		if ($hadShares) {
+			/**
+			 * Warn that share links have changed if there are shares
+			 */
+			$this->io->note([
+				'Please note that moving calendar ' . $calendar['uri'] . " from user <$userOrigin> to <$userDestination> has caused share links to change.",
+				'Sharees will need to change "example.com/remote.php/dav/calendars/uid/' . $calendar['uri'] . "_shared_by_$userOrigin\" to \"example.com/remote.php/dav/calendars/uid/" . $newName ?: $calendar['uri'] . "_shared_by_$userDestination\""
+			]);
+		}
+
+		$this->calDav->moveCalendar($name, self::URI_USERS . $userOrigin, self::URI_USERS . $userDestination, $newName);
+
+		$this->io->success("Calendar <$name> was moved from user <$userOrigin> to <$userDestination>" . ($newName ? " as <$newName>" : ''));
+		return self::SUCCESS;
+	}
+
+	/**
+	 * Check if the calendar exists for user
+	 */
+	protected function calendarExists(string $userDestination, string $name): bool {
+		return $this->calDav->getCalendarByUri(self::URI_USERS . $userDestination, $name) !== null;
+	}
+
+	/**
+	 * Try to find a suitable new calendar name that
+	 * doesn't exist for the provided user
+	 */
+	protected function getNewCalendarName(string $userDestination, string $name): string {
+		$increment = 1;
+		$newName = $name . '-' . $increment;
+		while ($increment <= 10) {
+			$this->io->writeln("Trying calendar name <$newName>", OutputInterface::VERBOSITY_VERBOSE);
+			if (!$this->calendarExists($userDestination, $newName)) {
+				// New name is good to go
+				$this->io->writeln("Found proper new calendar name <$newName>", OutputInterface::VERBOSITY_VERBOSE);
+				break;
+			}
+			$newName = $name . '-' . $increment;
+			$increment++;
+		}
+
+		return $newName;
+	}
+
+	/**
+	 * Check that moving the calendar won't break shares
+	 *
+	 * @return bool had any shares or not
+	 * @throws \InvalidArgumentException
+	 */
+	private function checkShares(array $calendar, string $userOrigin, string $userDestination, bool $force = false): bool {
+		$shares = $this->calDav->getShares($calendar['id']);
+		foreach ($shares as $share) {
+			[, $prefix, $userOrGroup] = explode('/', $share['href'], 3);
+
+			/**
+			 * Check that user destination is member of the groups which whom the calendar was shared
+			 * If we ask to force the migration, the share with the group is dropped
+			 */
+			if ($this->shareManager->shareWithGroupMembersOnly() === true && $prefix === 'groups' && !$this->groupManager->isInGroup($userDestination, $userOrGroup)) {
+				if ($force) {
+					$this->calDav->updateShares(new Calendar($this->calDav, $calendar, $this->l10n, $this->config, $this->logger), [], ['principal:principals/groups/' . $userOrGroup]);
+				} else {
+					throw new \InvalidArgumentException("User <$userDestination> is not part of the group <$userOrGroup> with whom the calendar <" . $calendar['uri'] . '> was shared. You may use -f to move the calendar while deleting this share.');
+				}
+			}
+
+			/**
+			 * Check that calendar isn't already shared with user destination
+			 */
+			if ($userOrGroup === $userDestination) {
+				if ($force) {
+					$this->calDav->updateShares(new Calendar($this->calDav, $calendar, $this->l10n, $this->config, $this->logger), [], ['principal:principals/users/' . $userOrGroup]);
+				} else {
+					throw new \InvalidArgumentException('The calendar <' . $calendar['uri'] . "> is already shared to user <$userDestination>.You may use -f to move the calendar while deleting this share.");
+				}
+			}
+		}
+
+		return count($shares) > 0;
+	}
+}