1 files changed, 14 insertions, 7 deletions
diff --git a/apps/dav/lib/UserMigration/ContactsMigrator.php b/apps/dav/lib/UserMigration/ContactsMigrator.php
index fc498288810..ae1a61ce4f4 100644
--- a/apps/dav/lib/UserMigration/ContactsMigrator.php
+++ b/apps/dav/lib/UserMigration/ContactsMigrator.php
@@ -48,6 +48,7 @@ use Sabre\VObject\Splitter\VCard as VCardSplitter;
 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;
 
@@ -198,15 +199,21 @@ class ContactsMigrator implements IMigrator, ISizeEstimationMigrator {
 	 * {@inheritDoc}
 	 */
 	public function getEstimatedExportSize(IUser $user): int {
-		$principalUri = $this->getPrincipalUri($user);
+		$addressBookExports = $this->getAddressBookExports($user, new NullOutput());
+		$addressBookCount = count($addressBookExports);
 
-		return array_sum(array_map(
-			function (array $addressBookInfo) use ($user): int {
-				// FIXME 1MiB by addressbook, no idea if this is accurate and if we should go into more details
-				return 1000;
-			},
-			$this->cardDavBackend->getAddressBooksForUser($principalUri),
+		// 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);
 	}
 
 	/**