From 123bf78ca8e25cbc91d937f5090423594bf7ae35 Mon Sep 17 00:00:00 2001
From: Joas Schilling <nickvergessen@owncloud.com>
Date: Tue, 14 Jun 2016 12:30:22 +0200
Subject: Clean up tags of deleted users

---
 lib/private/Repair.php           |  2 +-
 lib/private/Repair/CleanTags.php | 57 +++++++++++++++++++++++++++++++++++++++-
 2 files changed, 57 insertions(+), 2 deletions(-)

(limited to 'lib')

diff --git a/lib/private/Repair.php b/lib/private/Repair.php
index bb2967d7e6e..1fd204fcd84 100644
--- a/lib/private/Repair.php
+++ b/lib/private/Repair.php
@@ -127,7 +127,7 @@ class Repair implements IOutput{
 			new RepairLegacyStorages(\OC::$server->getConfig(), \OC::$server->getDatabaseConnection()),
 			new AssetCache(),
 			new FillETags(\OC::$server->getDatabaseConnection()),
-			new CleanTags(\OC::$server->getDatabaseConnection()),
+			new CleanTags(\OC::$server->getDatabaseConnection(), \OC::$server->getUserManager()),
 			new DropOldTables(\OC::$server->getDatabaseConnection()),
 			new DropOldJobs(\OC::$server->getJobList()),
 			new RemoveGetETagEntries(\OC::$server->getDatabaseConnection()),
diff --git a/lib/private/Repair/CleanTags.php b/lib/private/Repair/CleanTags.php
index 60ddeff08f3..4241fa6da3a 100644
--- a/lib/private/Repair/CleanTags.php
+++ b/lib/private/Repair/CleanTags.php
@@ -25,6 +25,7 @@ namespace OC\Repair;
 
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IDBConnection;
+use OCP\IUserManager;
 use OCP\Migration\IOutput;
 use OCP\Migration\IRepairStep;
 
@@ -38,11 +39,18 @@ class CleanTags implements IRepairStep {
 	/** @var IDBConnection */
 	protected $connection;
 
+	/** @var IUserManager */
+	protected $userManager;
+
+	protected $deletedTags = 0;
+
 	/**
 	 * @param IDBConnection $connection
+	 * @param IUserManager $userManager
 	 */
-	public function __construct(IDBConnection $connection) {
+	public function __construct(IDBConnection $connection, IUserManager $userManager) {
 		$this->connection = $connection;
+		$this->userManager = $userManager;
 	}
 
 	/**
@@ -56,11 +64,58 @@ class CleanTags implements IRepairStep {
 	 * Updates the configuration after running an update
 	 */
 	public function run(IOutput $output) {
+		$this->deleteOrphanTags($output);
 		$this->deleteOrphanFileEntries($output);
 		$this->deleteOrphanTagEntries($output);
 		$this->deleteOrphanCategoryEntries($output);
 	}
 
+	/**
+	 * Delete tags for deleted users
+	 */
+	protected function deleteOrphanTags(IOutput $output) {
+		$offset = 0;
+		while ($this->checkTags($offset)) {
+			$offset += 50;
+		}
+
+		$output->info(sprintf('%d tags of deleted users have been removed.', $this->deletedTags));
+	}
+
+	protected function checkTags($offset) {
+		$query = $this->connection->getQueryBuilder();
+		$query->select('uid')
+			->from('vcategory')
+			->groupBy('uid')
+			->orderBy('uid')
+			->setMaxResults(50)
+			->setFirstResult($offset);
+		$result = $query->execute();
+
+		$users = [];
+		$hadResults = false;
+		while ($row = $result->fetch()) {
+			$hadResults = true;
+			if (!$this->userManager->userExists($row['uid'])) {
+				$users[] = $row['uid'];
+			}
+		}
+		$result->closeCursor();
+
+		if (!$hadResults) {
+			// No more tags, stop looping
+			return false;
+		}
+
+		if (!empty($users)) {
+			$query = $this->connection->getQueryBuilder();
+			$query->delete('vcategory')
+				->where($query->expr()->in('uid', $query->createNamedParameter($users, IQueryBuilder::PARAM_STR_ARRAY)));
+			$this->deletedTags += $query->execute();
+		}
+		return true;
+	}
+
 	/**
 	 * Delete tag entries for deleted files
 	 */
-- 
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