1 files changed, 96 insertions, 0 deletions
diff --git a/apps/files/appinfo/update.php b/apps/files/appinfo/update.php
new file mode 100644
index 00000000000..d11a6237ad6
--- /dev/null
+++ b/apps/files/appinfo/update.php
@@ -0,0 +1,96 @@
+<?php
+/**
+ * @author Björn Schießle <schiessle@owncloud.com>
+ * @author Joas Schilling <nickvergessen@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, 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/>
+ *
+ */
+$installedVersion = \OC::$server->getConfig()->getAppValue('files', 'installed_version');
+$ocVersion = explode('.', \OC::$server->getSystemConfig()->getValue('version'));
+
+/**
+ * In case encryption was not enabled, we accidently set encrypted = 1 for
+ * files inside mount points, since 8.1.0. This breaks opening the files in
+ * 8.1.1 because we fixed the code that checks if a file is encrypted.
+ * In order to fix the file, we need to reset the flag of the file. However,
+ * the flag might be set because the file is in fact encrypted because it was
+ * uploaded at a time where encryption was enabled.
+ *
+ * So we can only do this when:
+ * - Current version of ownCloud before the update is 8.1.0 or 8.2.0.(0-2)
+ * - Encryption is disabled
+ * - files_encryption is not known in the app config
+ *
+ * If the first two are not the case, we are save. However, if files_encryption
+ * values exist in the config, we might have a false negative here.
+ * Now if there is no file with unencrypted size greater 0, that means there are
+ * no files that are still encrypted with "files_encryption" encryption. So we
+ * can also safely reset the flag here.
+ *
+ * If this is not the case, we go with "better save then sorry" and don't change
+ * the flag but write a message to the ownCloud log file.
+ */
+
+/**
+ * @param \OCP\IDBConnection $conn
+ */
+function owncloud_reset_encrypted_flag(\OCP\IDBConnection $conn) {
+	$conn->executeUpdate('UPDATE `*PREFIX*filecache` SET `encrypted` = 0');
+}
+
+// Current version of ownCloud before the update is 8.1.0 or 8.2.0.(0-2)
+if ($installedVersion === '1.1.9' && (
+		// 8.1.0.x
+		(((int) $ocVersion[0]) === 8 && ((int) $ocVersion[1]) === 1 && ((int) $ocVersion[2]) === 0)
+		||
+		// < 8.2.0.3
+		(((int) $ocVersion[0]) === 8 && ((int) $ocVersion[1]) === 2 && ((int) $ocVersion[2]) === 0 && ((int) $ocVersion[3]) < 3)
+	)) {
+
+	// Encryption is not enabled
+	if (!\OC::$server->getEncryptionManager()->isEnabled()) {
+		$conn = \OC::$server->getDatabaseConnection();
+
+		// Old encryption is not known in app config
+		$oldEncryption = \OC::$server->getConfig()->getAppKeys('files_encryption');
+		if (empty($oldEncryption)) {
+			owncloud_reset_encrypted_flag($conn);
+		} else {
+			$query = $conn->prepare('SELECT * FROM `*PREFIX*filecache` WHERE `encrypted` = 1 AND `unencrypted_size` > 0', 1);
+			$query->execute();
+			$empty = $query->fetch();
+
+			if (empty($empty)) {
+				owncloud_reset_encrypted_flag($conn);
+			} else {
+				/**
+				 * Sorry in case you are a false positive, but we are not 100% that
+				 * you don't have any encrypted files anymore, so we can not reset
+				 * the value safely
+				 */
+				\OC::$server->getLogger()->warning(
+					'If you have a problem with files not being accessible and '
+					. 'you are not using encryption, please have a look at the following'
+					. 'issue: {issue}',
+					[
+						'issue' => 'https://github.com/owncloud/core/issues/17846',
+					]
+				);
+			}
+		}
+	}
+}