persist data protection keys in etv config folder (#1585)

CHANGELOG.md

@@ -4,8 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
+### Added
 - Add `show_studio` to search index for seasons and episodes
 
+### Fixed
+- Fix antiforgery error caused by reusing existing browser tabs across docker container restarts
+  - Data protection keys will now be persisted under ErsatzTV's config folder instead of being recreated at startup 
+
 ## [0.8.5-beta] - 2024-01-30
 ### Added
 - Respect browser's `Accept-Language` header for date time display

ErsatzTV.Core/FileSystemLayout.cs

@@ -15,6 +15,8 @@ public static class FileSystemLayout
             Environment.SpecialFolderOption.Create),
         "etv-transcode");
 
+    public static readonly string DataProtectionFolder = Path.Combine(AppDataFolder, "data-protection");
+    
     public static readonly string LogsFolder = Path.Combine(AppDataFolder, "logs");
 
     public static readonly string DatabasePath = Path.Combine(AppDataFolder, "ersatztv.sqlite3");

ErsatzTV/Startup.cs

@@ -71,6 +71,7 @@ using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.Authentication.OpenIdConnect;
 using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.DataProtection;
 using Microsoft.AspNetCore.HttpOverrides;
 using Microsoft.AspNetCore.StaticFiles;
 using Microsoft.EntityFrameworkCore;
@@ -133,6 +134,8 @@ public class Startup
 #endif
             });
         
+        services.AddDataProtection().PersistKeysToFileSystem(new DirectoryInfo(FileSystemLayout.DataProtectionFolder));
+
         OidcHelper.Init(Configuration);
         JwtHelper.Init(Configuration);
         SearchHelper.Init(Configuration);