From 36089fd68f9f7bb558aa3057f713d8a67eff05f9 Mon Sep 17 00:00:00 2001
From: Matt Gibson <mgibson@bitwarden.com>
Date: Tue, 2 Mar 2021 11:25:45 -0600
Subject: [PATCH] Write backup before deleting lowdb database (#291)

* Write backup before deleting lowdb database

* Const for unchanged variables
---
 src/services/lowdbStorage.service.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/services/lowdbStorage.service.ts b/src/services/lowdbStorage.service.ts
index b41289f902b..616451f0d23 100644
--- a/src/services/lowdbStorage.service.ts
+++ b/src/services/lowdbStorage.service.ts
@@ -47,6 +47,13 @@ export class LowdbStorageService implements StorageService {
         } catch (e) {
             if (e instanceof SyntaxError) {
                 this.logService.warning(`Error creating lowdb storage adapter, "${e.message}"; emptying data file.`);
+                if (fs.existsSync(this.dataFilePath)) {
+                    const backupPath = this.dataFilePath + '.bak';
+                    this.logService.warning(`Writing backup of data file to ${backupPath}`);
+                    await fs.copyFile(this.dataFilePath, backupPath, err => {
+                        this.logService.warning(`Error while creating data file backup, "${e.message}". No backup may have been created.`);
+                    });
+                }
                 adapter.write({});
                 this.db = lowdb(adapter);
             } else {