Contacts export and import

Signed-off-by: Christopher Ng <chrng8@gmail.com>

3 files changed, 430 insertions, 0 deletions

diff --git a/apps/dav/lib/UserMigration/ContactsMigrator.php b/apps/dav/lib/UserMigration/ContactsMigrator.php
new file mode 100644
index 00000000000..bc0504f0e20
--- /dev/null
+++ b/apps/dav/lib/UserMigration/ContactsMigrator.php
@@ -0,0 +1,366 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2022 Christopher Ng <chrng8@gmail.com>
+ *
+ * @author Christopher Ng <chrng8@gmail.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\DAV\UserMigration;
+
+use function Safe\sort;
+use function Safe\substr;
+use OCA\DAV\AppInfo\Application;
+use OCA\DAV\CardDAV\CardDavBackend;
+use OCA\DAV\CardDAV\Plugin as CardDAVPlugin;
+use OCA\DAV\Connector\Sabre\CachingTree;
+use OCA\DAV\Connector\Sabre\Server as SabreDavServer;
+use OCA\DAV\RootCollection;
+use OCP\IL10N;
+use OCP\IUser;
+use OCP\UserMigration\IExportDestination;
+use OCP\UserMigration\IImportSource;
+use OCP\UserMigration\IMigrator;
+use OCP\UserMigration\TMigratorBasicVersionHandling;
+use Sabre\VObject\Component\VCard;
+use Sabre\VObject\Parser\Parser as VObjectParser;
+use Sabre\VObject\Reader as VObjectReader;
+use Sabre\VObject\Splitter\VCard as VCardSplitter;
+use Sabre\VObject\UUIDUtil;
+use Safe\Exceptions\ArrayException;
+use Safe\Exceptions\StringsException;
+use Symfony\Component\Console\Output\OutputInterface;
+use Throwable;
+
+class ContactsMigrator implements IMigrator {
+
+	use TMigratorBasicVersionHandling;
+
+	private CardDavBackend $cardDavBackend;
+
+	private IL10N $l10n;
+
+	private SabreDavServer $sabreDavServer;
+
+	private const USERS_URI_ROOT = 'principals/users/';
+
+	private const FILENAME_EXT = 'vcf';
+
+	private const METADATA_EXT = 'json';
+
+	private const MIGRATED_URI_PREFIX = 'migrated-';
+
+	private const PATH_ROOT = Application::APP_ID . '/address_books/';
+
+	public function __construct(
+		CardDavBackend $cardDavBackend,
+		IL10N $l10n
+	) {
+		$this->cardDavBackend = $cardDavBackend;
+		$this->l10n = $l10n;
+
+		$root = new RootCollection();
+		$this->sabreDavServer = new SabreDavServer(new CachingTree($root));
+		$this->sabreDavServer->addPlugin(new CardDAVPlugin());
+	}
+
+	private function getPrincipalUri(IUser $user): string {
+		return ContactsMigrator::USERS_URI_ROOT . $user->getUID();
+	}
+
+	/**
+	 * @return array{name: string, displayName: string, description: ?string, vCards: VCard[]}
+	 *
+	 * @throws InvalidAddressBookException
+	 */
+	private function getAddressBookExportData(IUser $user, array $addressBookInfo, OutputInterface $output): array {
+		$userId = $user->getUID();
+
+		if (!isset($addressBookInfo['uri'])) {
+			throw new InvalidAddressBookException();
+		}
+
+		['uri' => $uri] =  $addressBookInfo;
+
+		$path = CardDAVPlugin::ADDRESSBOOK_ROOT . "/users/$userId/$uri";
+
+		/**
+		 * @see \Sabre\CardDAV\VCFExportPlugin::httpGet() implementation reference
+		 */
+
+		$addressBookDataProp = '{' . CardDAVPlugin::NS_CARDDAV . '}address-data';
+		$addressBookNode = $this->sabreDavServer->tree->getNodeForPath($path);
+		$nodes = $this->sabreDavServer->getPropertiesIteratorForPath($path, [$addressBookDataProp], 1);
+
+		/**
+		 * @see \Sabre\CardDAV\VCFExportPlugin::generateVCF() implementation reference
+		 */
+
+		/** @var VCard[] $vCards */
+		$vCards = [];
+		foreach ($nodes as $node) {
+			if (isset($node[200][$addressBookDataProp])) {
+				$vCard = VObjectReader::read($node[200][$addressBookDataProp]);
+
+				$problems = $vCard->validate();
+				if (!empty($problems)) {
+					$output->writeln('Skipping contact "' . ($vCard->FN ?? null) . '" containing invalid contact data');
+					continue;
+				}
+				$vCards[] = $vCard;
+			}
+		}
+
+		return [
+			'name' => $addressBookNode->getName(),
+			'displayName' => $addressBookInfo['{DAV:}displayname'],
+			'description' => $addressBookInfo['{' . CardDAVPlugin::NS_CARDDAV . '}addressbook-description'],
+			'vCards' => $vCards,
+		];
+	}
+
+	/**
+	 * @return array<int, array{name: string, displayName: string, description: ?string, vCards: VCard[]}>
+	 */
+	private function getAddressBookExports(IUser $user, OutputInterface $output): array {
+		$principalUri = $this->getPrincipalUri($user);
+
+		return array_values(array_filter(array_map(
+			function (array $addressBookInfo) use ($user, $output) {
+				try {
+					return $this->getAddressBookExportData($user, $addressBookInfo, $output);
+				} catch (InvalidAddressBookException $e) {
+					// Allow this exception as invalid address books are not to be exported
+					return null;
+				}
+			},
+			$this->cardDavBackend->getAddressBooksForUser($principalUri),
+		)));
+	}
+
+	private function getUniqueAddressBookUri(IUser $user, string $initialAddressBookUri): string {
+		$principalUri = $this->getPrincipalUri($user);
+
+		try {
+			$initialAddressBookUri = substr($initialAddressBookUri, 0, strlen(ContactsMigrator::MIGRATED_URI_PREFIX)) === ContactsMigrator::MIGRATED_URI_PREFIX
+				? $initialAddressBookUri
+				: ContactsMigrator::MIGRATED_URI_PREFIX . $initialAddressBookUri;
+		} catch (StringsException $e) {
+			throw new ContactsMigratorException('Failed to get unique address book URI', 0, $e);
+		}
+
+		$existingAddressBookUris = array_map(
+			fn (array $addressBookInfo) => $addressBookInfo['uri'],
+			$this->cardDavBackend->getAddressBooksForUser($principalUri),
+		);
+
+		$addressBookUri = $initialAddressBookUri;
+		$acc = 1;
+		while (in_array($addressBookUri, $existingAddressBookUris, true)) {
+			$addressBookUri = $initialAddressBookUri . "-$acc";
+			++$acc;
+		}
+
+		return $addressBookUri;
+	}
+
+	/**
+	 * @param VCard[] $vCards
+	 */
+	private function serializeCards(array $vCards): string {
+		return array_reduce(
+			$vCards,
+			fn (string $addressBookBlob, VCard $vCard) => $addressBookBlob . $vCard->serialize(),
+			'',
+		);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function export(IUser $user, IExportDestination $exportDestination, OutputInterface $output): void {
+		$output->writeln('Exporting contacts into ' . ContactsMigrator::PATH_ROOT . '…');
+
+		$addressBookExports = $this->getAddressBookExports($user, $output);
+
+		if (empty($addressBookExports)) {
+			$output->writeln('No contacts to export…');
+		}
+
+		/**
+		 * @var string $name
+		 * @var string $displayName
+		 * @var ?string $description
+		 * @var VCard[] $vCards
+		 */
+		foreach ($addressBookExports as ['name' => $name, 'displayName' => $displayName, 'description' => $description, 'vCards' => $vCards]) {
+			// Set filename to sanitized address book name appended with the date
+			$basename = preg_replace('/[^a-zA-Z0-9-_ ]/um', '', $name) . '_' . date('Y-m-d');
+			$exportPath = ContactsMigrator::PATH_ROOT . $basename . '.' . ContactsMigrator::FILENAME_EXT;
+			$metadataExportPath = ContactsMigrator::PATH_ROOT . $basename . '.' . ContactsMigrator::METADATA_EXT;
+
+			if ($exportDestination->addFileContents($exportPath, $this->serializeCards($vCards)) === false) {
+				throw new ContactsMigratorException('Could not export address book');
+			}
+
+			$metadata = array_filter(['displayName' => $displayName, 'description' => $description]);
+			if ($exportDestination->addFileContents($metadataExportPath, json_encode($metadata)) === false) {
+				throw new ContactsMigratorException('Could not export address book metadata');
+			}
+		}
+	}
+
+	private function importContact(int $addressBookId, VCard $vCard, string $filename, OutputInterface $output): void {
+		// Operate on clone to prevent mutation of the original
+		$vCard = clone $vCard;
+		$vCard->PRODID = '-//IDN nextcloud.com//Migrated contact//EN';
+
+		try {
+			$this->cardDavBackend->createCard(
+				$addressBookId,
+				UUIDUtil::getUUID() . '.' . ContactsMigrator::FILENAME_EXT,
+				$vCard->serialize(),
+			);
+		} catch (Throwable $e) {
+			$output->writeln("Error creating contact \"" . ($vCard->FN ?? null) . "\" from \"$filename\", skipping…");
+		}
+	}
+
+	/**
+	 * @param array{displayName: string, description?: string} $metadata
+	 * @param VCard[] $vCards
+	 */
+	private function importAddressBook(IUser $user, string $filename, string $initialAddressBookUri, array $metadata, array $vCards, OutputInterface $output): void {
+		$principalUri = $this->getPrincipalUri($user);
+		$addressBookUri = $this->getUniqueAddressBookUri($user, $initialAddressBookUri);
+
+		$addressBookId = $this->cardDavBackend->createAddressBook($principalUri, $addressBookUri, array_filter([
+			'{DAV:}displayname' => $metadata['displayName'],
+			'{' . CardDAVPlugin::NS_CARDDAV . '}addressbook-description' => $metadata['description'] ?? null,
+		]));
+
+		foreach ($vCards as $vCard) {
+			$this->importContact($addressBookId, $vCard, $filename, $output);
+		}
+	}
+
+	/**
+	 * @return array<int, array{addressBook: string, metadata: string}>
+	 */
+	private function getAddressBookImports(array $importFiles): array {
+		$addressBookImports = array_filter(
+			$importFiles,
+			fn (string $filename) => pathinfo($filename, PATHINFO_EXTENSION) === ContactsMigrator::FILENAME_EXT,
+		);
+
+		$metadataImports = array_filter(
+			$importFiles,
+			fn (string $filename) => pathinfo($filename, PATHINFO_EXTENSION) === ContactsMigrator::METADATA_EXT,
+		);
+
+		try {
+			sort($addressBookImports);
+			sort($metadataImports);
+		} catch (ArrayException $e) {
+			throw new ContactsMigratorException('Failed to sort address book files in ' . ContactsMigrator::PATH_ROOT, 0, $e);
+		}
+
+		if (count($addressBookImports) !== count($metadataImports)) {
+			throw new ContactsMigratorException('Each ' . ContactsMigrator::FILENAME_EXT . ' file must have a corresponding ' . ContactsMigrator::METADATA_EXT . ' file');
+		}
+
+		for ($i = 0; $i < count($addressBookImports); ++$i) {
+			if (pathinfo($addressBookImports[$i], PATHINFO_FILENAME) !== pathinfo($metadataImports[$i], PATHINFO_FILENAME)) {
+				throw new ContactsMigratorException('Each ' . ContactsMigrator::FILENAME_EXT . ' file must have a corresponding ' . ContactsMigrator::METADATA_EXT . ' file');
+			}
+		}
+
+		return array_map(
+			fn (string $addressBookFilename, string $metadataFilename) => ['addressBook' => $addressBookFilename, 'metadata' => $metadataFilename],
+			$addressBookImports,
+			$metadataImports,
+		);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 *
+	 * @throws ContactsMigratorException
+	 */
+	public function import(IUser $user, IImportSource $importSource, OutputInterface $output): void {
+		if ($importSource->getMigratorVersion(static::class) === null) {
+			$output->writeln('No version for ' . static::class . ', skipping import…');
+			return;
+		}
+
+		$output->writeln('Importing contacts from ' . ContactsMigrator::PATH_ROOT . '…');
+
+		$importFiles = $importSource->getFolderListing(ContactsMigrator::PATH_ROOT);
+
+		if (empty($importFiles)) {
+			$output->writeln('No contacts to import…');
+		}
+
+		foreach ($this->getAddressBookImports($importFiles) as ['addressBook' => $addressBookFilename, 'metadata' => $metadataFilename]) {
+			$addressBookImportPath = ContactsMigrator::PATH_ROOT . $addressBookFilename;
+			$metadataImportPath = ContactsMigrator::PATH_ROOT . $metadataFilename;
+
+			$vCardSplitter = new VCardSplitter(
+				$importSource->getFileAsStream($addressBookImportPath),
+				VObjectParser::OPTION_FORGIVING,
+			);
+
+			/** @var VCard[] $vCards */
+			$vCards = [];
+			/** @var ?VCard $vCard */
+			while ($vCard = $vCardSplitter->getNext()) {
+				$problems = $vCard->validate();
+				if (!empty($problems)) {
+					$output->writeln('Skipping contact "' . ($vCard->FN ?? null) . '" containing invalid contact data');
+					continue;
+				}
+				$vCards[] = $vCard;
+			}
+
+			$splitFilename = explode('_', $addressBookFilename, 2);
+			if (count($splitFilename) !== 2) {
+				throw new ContactsMigratorException("Invalid filename \"$addressBookFilename\", expected filename of the format \"<address_book_name>_YYYY-MM-DD." . ContactsMigrator::FILENAME_EXT . '"');
+			}
+			[$initialAddressBookUri, $suffix] = $splitFilename;
+
+			/** @var array{displayName: string, description?: string} $metadata */
+			$metadata = json_decode($importSource->getFileContents($metadataImportPath), true, 512, JSON_THROW_ON_ERROR);
+
+			$this->importAddressBook(
+				$user,
+				$addressBookFilename,
+				$initialAddressBookUri,
+				$metadata,
+				$vCards,
+				$output,
+			);
+
+			foreach ($vCards as $vCard) {
+				$vCard->destroy();
+			}
+		}
+	}
+}
diff --git a/apps/dav/lib/UserMigration/ContactsMigratorException.php b/apps/dav/lib/UserMigration/ContactsMigratorException.php
new file mode 100644
index 00000000000..63dedebf73d
--- /dev/null
+++ b/apps/dav/lib/UserMigration/ContactsMigratorException.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2022 Christopher Ng <chrng8@gmail.com>
+ *
+ * @author Christopher Ng <chrng8@gmail.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\DAV\UserMigration;
+
+use OCP\UserMigration\UserMigrationException;
+
+class ContactsMigratorException extends UserMigrationException {
+}
diff --git a/apps/dav/lib/UserMigration/InvalidAddressBookException.php b/apps/dav/lib/UserMigration/InvalidAddressBookException.php
new file mode 100644
index 00000000000..fd99eac1a73
--- /dev/null
+++ b/apps/dav/lib/UserMigration/InvalidAddressBookException.php
@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2022 Christopher Ng <chrng8@gmail.com>
+ *
+ * @author Christopher Ng <chrng8@gmail.com>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\DAV\UserMigration;
+
+use Exception;
+
+class InvalidAddressBookException extends Exception {
+}