From 745bfda41fb033e679ebb43bb347d403b8eb1193 Mon Sep 17 00:00:00 2001
From: Roeland Jago Douma <rullzer@owncloud.com>
Date: Thu, 11 Feb 2016 13:28:15 +0100
Subject: [PATCH] Fix migration step to avoind invisible shares

---
 apps/files_sharing/lib/migration.php       | 68 ++++++++++++----------
 apps/files_sharing/tests/migrationtest.php | 27 ++++++++-
 2 files changed, 63 insertions(+), 32 deletions(-)

diff --git a/apps/files_sharing/lib/migration.php b/apps/files_sharing/lib/migration.php
index e734638551..31a76687d4 100644
--- a/apps/files_sharing/lib/migration.php
+++ b/apps/files_sharing/lib/migration.php
@@ -55,32 +55,30 @@ class Migration {
 	 */
 	public function removeReShares() {
 
-		while(true) {
-			$reShares = $this->getReShares(1000);
+		$stmt = $this->getReShares();
 
-			if (empty($reShares)) {
-				break;
-			}
+		$owners = [];
+		while($share = $stmt->fetch()) {
 
-			// Update the cache
-			foreach($reShares as $reShare) {
-				$this->shareCache[$reShare['id']] = $reShare;
-			}
+			$this->shareCache[$share['id']] = $share;
 
-			$owners = [];
-			foreach ($reShares as $share) {
-				$owners[$share['id']] = [
+			$owners[$share['id']] = [
 					'owner' => $this->findOwner($share),
-					'initiator' => $share['uid_owner']
-				];
-			}
-			$this->updateOwners($owners);
+					'initiator' => $share['uid_owner'],
+					'type' => $share['share_type'],
+			];
 
-			//Clear the cache of the shares we just updated so we have more room
-			foreach($owners as $id => $owner) {
-				unset($this->shareCache[$id]);
+			if (count($owners) === 1000) {
+				$this->updateOwners($owners);
+				$owners = [];
 			}
 		}
+
+		$stmt->closeCursor();
+
+		if (count($owners)) {
+			$this->updateOwners($owners);
+		}
 	}
 
 	/**
@@ -99,7 +97,8 @@ class Migration {
 			foreach ($shares as $share) {
 				$owners[$share['id']] = [
 					'owner' => $share['uid_owner'],
-					'initiator' => $share['uid_owner']
+					'initiator' => $share['uid_owner'],
+					'type' => $share['share_type'],
 				];
 			}
 			$this->updateOwners($owners);
@@ -130,11 +129,11 @@ class Migration {
 	 * Get $n re-shares from the database
 	 *
 	 * @param int $n The max number of shares to fetch
-	 * @return array
+	 * @return \Doctrine\DBAL\Driver\Statement
 	 */
-	private function getReShares($n = 1000) {
+	private function getReShares() {
 		$query = $this->connection->getQueryBuilder();
-		$query->select(['id', 'parent', 'uid_owner'])
+		$query->select(['id', 'parent', 'uid_owner', 'share_type'])
 			->from($this->table)
 			->where($query->expr()->in(
 				'share_type',
@@ -156,9 +155,10 @@ class Migration {
 				)
 			))
 			->andWhere($query->expr()->isNotNull('parent'))
-			->orderBy('id', 'asc')
-			->setMaxResults($n);
-		$result = $query->execute();
+			->orderBy('id', 'asc');
+		return $query->execute();
+
+
 		$shares = $result->fetchAll();
 		$result->closeCursor();
 
@@ -178,7 +178,7 @@ class Migration {
 	 */
 	private function getMissingInitiator($n = 1000) {
 		$query = $this->connection->getQueryBuilder();
-		$query->select(['id', 'uid_owner'])
+		$query->select(['id', 'uid_owner', 'share_type'])
 			->from($this->table)
 			->where($query->expr()->in(
 				'share_type',
@@ -247,11 +247,17 @@ class Migration {
 			foreach ($owners as $id => $owner) {
 				$query = $this->connection->getQueryBuilder();
 				$query->update($this->table)
-					->set('parent', $query->createNamedParameter(null))
 					->set('uid_owner', $query->createNamedParameter($owner['owner']))
-					->set('uid_initiator', $query->createNamedParameter($owner['initiator']))
-					->where($query->expr()->eq('id', $query->createNamedParameter($id)))
-					->execute();
+					->set('uid_initiator', $query->createNamedParameter($owner['initiator']));
+
+
+				if ((int)$owner['type'] !== \OCP\Share::SHARE_TYPE_LINK) {
+					$query->set('parent', $query->createNamedParameter(null));
+				}
+
+				$query->where($query->expr()->eq('id', $query->createNamedParameter($id)));
+
+				$query->execute();
 			}
 
 			$this->connection->commit();
diff --git a/apps/files_sharing/tests/migrationtest.php b/apps/files_sharing/tests/migrationtest.php
index 8a40b76a64..1bca4a419f 100644
--- a/apps/files_sharing/tests/migrationtest.php
+++ b/apps/files_sharing/tests/migrationtest.php
@@ -226,6 +226,23 @@ class MigrationTest extends TestCase {
 		$this->assertSame(1,
 			$query->execute()
 		);
+
+		// Link reshare should keep its parent
+		$query->setParameter('share_type', \OCP\Share::SHARE_TYPE_LINK)
+			->setParameter('share_with', null)
+			->setParameter('uid_owner', 'user3')
+			->setParameter('uid_initiator', '')
+			->setParameter('parent', $parent)
+			->setParameter('item_type', 'file')
+			->setParameter('item_source', '2')
+			->setParameter('item_target', '/2')
+			->setParameter('file_source', 2)
+			->setParameter('file_target', '/foobar')
+			->setParameter('permissions', 31)
+			->setParameter('stime', time());
+		$this->assertSame(1,
+			$query->execute()
+		);
 	}
 
 	public function testRemoveReShares() {
@@ -238,7 +255,7 @@ class MigrationTest extends TestCase {
 		$query = $this->connection->getQueryBuilder();
 		$query->select('*')->from($this->table)->orderBy('id');
 		$result = $query->execute()->fetchAll();
-		$this->assertSame(9, count($result));
+		$this->assertSame(10, count($result));
 
 		// shares which shouldn't be modified
 		for ($i = 0; $i < 4; $i++) {
@@ -261,6 +278,14 @@ class MigrationTest extends TestCase {
 			$this->assertSame($user, $result[$i]['uid_initiator']);
 			$this->assertNull($result[$i]['parent']);
 		}
+
+		/*
+		 * The link share is flattend but has an owner to avoid invisible shares
+		 * see: https://github.com/owncloud/core/pull/22317
+		 */
+		$this->assertSame('owner2', $result[9]['uid_owner']);
+		$this->assertSame('user3', $result[9]['uid_initiator']);
+		$this->assertSame($result[7]['id'], $result[9]['parent']);
 	}
 
 	public function test1001DeepReshares() {