1 files changed, 109 insertions, 0 deletions
diff --git a/lib/private/releasenotes.php b/lib/private/releasenotes.php
new file mode 100644
index 00000000000..5da416c19f0
--- /dev/null
+++ b/lib/private/releasenotes.php
@@ -0,0 +1,109 @@
+<?php
+/**
+ * @author Victor Dubiniuk <dubiniuk@owncloud.com>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC;
+
+use Doctrine\DBAL\Platforms\MySqlPlatform;
+use OCP\IDBConnection;
+
+/**
+ * Class to store release notes
+ */
+class ReleaseNotes {
+	 /** @var IDBConnection $dbConnection */
+	protected $dbConnection;
+
+	/**
+	 * @param IDBConnection $dbConnection
+	 */
+	public function __construct(IDBConnection $dbConnection) {
+		$this->dbConnection = $dbConnection;
+	}
+
+	/**
+	 * @param string $fromVersion
+	 * @param string $toVersion
+	 * @return string[]
+	 */
+	public function getReleaseNotes($fromVersion, $toVersion) {
+		$releaseNotes = [];
+		$l10n = \OC::$server->getL10N('core');
+
+		try {
+			$fromVersionMajorMinor = $this->getMajorMinor($fromVersion);
+		} catch (\InvalidArgumentException $e) {
+			$fromVersionMajorMinor = '';
+		}
+
+		try {
+			$toVersionMajorMinor = $this->getMajorMinor($toVersion);
+		} catch (\InvalidArgumentException $e) {
+			$toVersionMajorMinor = '';
+		}
+
+		if ($fromVersionMajorMinor === '8.2' && $toVersionMajorMinor === '9.0') {
+			if ($this->isMysql() && $this->countFilecacheEntries() > 200000) {
+				$releaseNotes[] = $l10n->t(
+					'Hint: You can speed up the upgrade by executing this SQL command manually: ALTER TABLE %s ADD COLUMN checksum varchar(255) DEFAULT NULL AFTER permissions;',
+					[$this->dbConnection->getQueryBuilder()->getTableName('filecache')]
+				);
+			}
+		}
+		return $releaseNotes;
+	}
+
+	/**
+	 * @return bool
+	 */
+	protected function isMysql(){
+		return $this->dbConnection->getDatabasePlatform() instanceof MySqlPlatform;
+	}
+
+	/**
+	 * Count entries in filecache table
+	 * @return int
+	 */
+	protected function countFilecacheEntries(){
+		$query = $this->dbConnection->getQueryBuilder();
+		$query->selectAlias($query->createFunction('COUNT(*)'), 'num_entries')
+			->from('filecache');
+
+		$result = $query->execute();
+		$row = $result->fetch();
+		$result->closeCursor();
+
+		return (int) $row['num_entries'];
+	}
+
+	/**
+	 * Strip everything except first digits
+	 * @param string $version
+	 * @return string
+	 * @throws \InvalidArgumentException
+	 */
+	private function getMajorMinor($version){
+		$versionArray = explode('.', $version);
+		if (count($versionArray) < 2) {
+			throw new \InvalidArgumentException('Version should have at least 2 parts separated by dot.');
+		}
+		return implode('.', [ $versionArray[0], $versionArray[1] ]);
+	}
+}