Add a method to get estimated export size in IMigrator

apps/dav/lib/UserMigration/CalendarMigrator.php

@@ -42,6 +42,7 @@
 use OCP\UserMigration\IExportDestination;
 use OCP\UserMigration\IImportSource;
 use OCP\UserMigration\IMigrator;
+use OCP\UserMigration\ISizeEstimationMigrator;
 use OCP\UserMigration\TMigratorBasicVersionHandling;
 use Sabre\VObject\Component as VObjectComponent;
 use Sabre\VObject\Component\VCalendar;
@@ -50,10 +51,11 @@
 use Sabre\VObject\Reader as VObjectReader;
 use Sabre\VObject\UUIDUtil;
 use Safe\Exceptions\StringsException;
+use Symfony\Component\Console\Output\NullOutput;
 use Symfony\Component\Console\Output\OutputInterface;
 use Throwable;
 
-class CalendarMigrator implements IMigrator {
+class CalendarMigrator implements IMigrator, ISizeEstimationMigrator {
 
 	use TMigratorBasicVersionHandling;
 
@@ -206,6 +208,31 @@ private function getUniqueCalendarUri(IUser $user, string $initialCalendarUri):
 		return $calendarUri;
 	}
 
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getEstimatedExportSize(IUser $user): int {
+		$calendarExports = $this->getCalendarExports($user, new NullOutput());
+		$calendarCount = count($calendarExports);
+
+		// 150B for top-level properties
+		$size = ($calendarCount * 150) / 1024;
+
+		$componentCount = array_sum(array_map(
+			function (array $data): int {
+				/** @var VCalendar $vCalendar */
+				$vCalendar = $data['vCalendar'];
+				return count($vCalendar->getComponents());
+			},
+			$calendarExports,
+		));
+
+		// 450B for each component (events, todos, alarms, etc.)
+		$size += ($componentCount * 450) / 1024;
+
+		return (int)ceil($size);
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */

apps/dav/lib/UserMigration/ContactsMigrator.php

@@ -39,6 +39,7 @@
 use OCP\UserMigration\IExportDestination;
 use OCP\UserMigration\IImportSource;
 use OCP\UserMigration\IMigrator;
+use OCP\UserMigration\ISizeEstimationMigrator;
 use OCP\UserMigration\TMigratorBasicVersionHandling;
 use Sabre\VObject\Component\VCard;
 use Sabre\VObject\Parser\Parser as VObjectParser;
@@ -47,10 +48,11 @@
 use Sabre\VObject\UUIDUtil;
 use Safe\Exceptions\ArrayException;
 use Safe\Exceptions\StringsException;
+use Symfony\Component\Console\Output\NullOutput;
 use Symfony\Component\Console\Output\OutputInterface;
 use Throwable;
 
-class ContactsMigrator implements IMigrator {
+class ContactsMigrator implements IMigrator, ISizeEstimationMigrator {
 
 	use TMigratorBasicVersionHandling;
 
@@ -193,6 +195,27 @@ private function serializeCards(array $vCards): string {
 		);
 	}
 
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getEstimatedExportSize(IUser $user): int {
+		$addressBookExports = $this->getAddressBookExports($user, new NullOutput());
+		$addressBookCount = count($addressBookExports);
+
+		// 50B for each metadata JSON
+		$size = ($addressBookCount * 50) / 1024;
+
+		$contactsCount = array_sum(array_map(
+			fn (array $data): int => count($data['vCards']),
+			$addressBookExports,
+		));
+
+		// 350B for each contact
+		$size += ($contactsCount * 350) / 1024;
+
+		return (int)ceil($size);
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */

apps/files_trashbin/lib/UserMigration/TrashbinMigrator.php

@@ -36,11 +36,12 @@
 use OCP\UserMigration\IExportDestination;
 use OCP\UserMigration\IImportSource;
 use OCP\UserMigration\IMigrator;
+use OCP\UserMigration\ISizeEstimationMigrator;
 use OCP\UserMigration\TMigratorBasicVersionHandling;
 use OCP\UserMigration\UserMigrationException;
 use Symfony\Component\Console\Output\OutputInterface;
 
-class TrashbinMigrator implements IMigrator {
+class TrashbinMigrator implements IMigrator, ISizeEstimationMigrator {
 
 	use TMigratorBasicVersionHandling;
 
@@ -63,6 +64,23 @@ public function __construct(
 		$this->l10n = $l10n;
 	}
 
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getEstimatedExportSize(IUser $user): int {
+		$uid = $user->getUID();
+
+		try {
+			$trashbinFolder = $this->root->get('/'.$uid.'/files_trashbin');
+			if (!$trashbinFolder instanceof Folder) {
+				return 0;
+			}
+			return (int)ceil($trashbinFolder->getSize() / 1024);
+		} catch (\Throwable $e) {
+			return 0;
+		}
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */

apps/settings/lib/UserMigration/AccountMigrator.php

@@ -37,11 +37,12 @@
 use OCP\UserMigration\IExportDestination;
 use OCP\UserMigration\IImportSource;
 use OCP\UserMigration\IMigrator;
+use OCP\UserMigration\ISizeEstimationMigrator;
 use OCP\UserMigration\TMigratorBasicVersionHandling;
 use Symfony\Component\Console\Output\OutputInterface;
 use Throwable;
 
-class AccountMigrator implements IMigrator {
+class AccountMigrator implements IMigrator, ISizeEstimationMigrator {
 	use TMigratorBasicVersionHandling;
 
 	use TAccountsHelper;
@@ -68,6 +69,25 @@ public function __construct(
 		$this->l10n = $l10n;
 	}
 
+	/**
+	 * {@inheritDoc}
+	 */
+	public function getEstimatedExportSize(IUser $user): int {
+		$size = 100; // 100KiB for account JSON
+
+		try {
+			$avatar = $this->avatarManager->getAvatar($user->getUID());
+			if ($avatar->isCustomAvatar()) {
+				$avatarFile = $avatar->getFile(-1);
+				$size += $avatarFile->getSize() / 1024;
+			}
+		} catch (Throwable $e) {
+			// Skip avatar in size estimate on failure
+		}
+
+		return (int)ceil($size);
+	}
+
 	/**
 	 * {@inheritDoc}
 	 */

lib/composer/composer/autoload_classmap.php

@@ -569,6 +569,7 @@
     'OCP\\UserMigration\\IExportDestination' => $baseDir . '/lib/public/UserMigration/IExportDestination.php',
     'OCP\\UserMigration\\IImportSource' => $baseDir . '/lib/public/UserMigration/IImportSource.php',
     'OCP\\UserMigration\\IMigrator' => $baseDir . '/lib/public/UserMigration/IMigrator.php',
+    'OCP\\UserMigration\\ISizeEstimationMigrator' => $baseDir . '/lib/public/UserMigration/ISizeEstimationMigrator.php',
     'OCP\\UserMigration\\TMigratorBasicVersionHandling' => $baseDir . '/lib/public/UserMigration/TMigratorBasicVersionHandling.php',
     'OCP\\UserMigration\\UserMigrationException' => $baseDir . '/lib/public/UserMigration/UserMigrationException.php',
     'OCP\\UserStatus\\IManager' => $baseDir . '/lib/public/UserStatus/IManager.php',

lib/composer/composer/autoload_static.php

@@ -598,6 +598,7 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\UserMigration\\IExportDestination' => __DIR__ . '/../../..' . '/lib/public/UserMigration/IExportDestination.php',
         'OCP\\UserMigration\\IImportSource' => __DIR__ . '/../../..' . '/lib/public/UserMigration/IImportSource.php',
         'OCP\\UserMigration\\IMigrator' => __DIR__ . '/../../..' . '/lib/public/UserMigration/IMigrator.php',
+        'OCP\\UserMigration\\ISizeEstimationMigrator' => __DIR__ . '/../../..' . '/lib/public/UserMigration/ISizeEstimationMigrator.php',
         'OCP\\UserMigration\\TMigratorBasicVersionHandling' => __DIR__ . '/../../..' . '/lib/public/UserMigration/TMigratorBasicVersionHandling.php',
         'OCP\\UserMigration\\UserMigrationException' => __DIR__ . '/../../..' . '/lib/public/UserMigration/UserMigrationException.php',
         'OCP\\UserStatus\\IManager' => __DIR__ . '/../../..' . '/lib/public/UserStatus/IManager.php',

lib/public/UserMigration/ISizeEstimationMigrator.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright 2022 Christopher Ng <chrng8@gmail.com>
+ *
+ * @author Christopher Ng <chrng8@gmail.com>
+ * @author Côme Chilliet <come.chilliet@nextcloud.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 OCP\UserMigration;
+
+use OCP\IUser;
+
+/**
+ * @since 25.0.0
+ */
+interface ISizeEstimationMigrator {
+	/**
+	 * Returns an estimate of the exported data size in KiB.
+	 * Should be fast, favor performance over accuracy.
+	 *
+	 * @since 25.0.0
+	 */
+	public function getEstimatedExportSize(IUser $user): int;
+}