1 files changed, 39 insertions, 3 deletions
diff --git a/Jellyfin.Server.Implementations/Extensions/ServiceCollectionExtensions.cs b/Jellyfin.Server.Implementations/Extensions/ServiceCollectionExtensions.cs
index 392a8de2c..63c80634f 100644
--- a/Jellyfin.Server.Implementations/Extensions/ServiceCollectionExtensions.cs
+++ b/Jellyfin.Server.Implementations/Extensions/ServiceCollectionExtensions.cs
@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
+using System.Linq;
 using System.Reflection;
 using Jellyfin.Database.Implementations;
 using Jellyfin.Database.Implementations.DbConfiguration;
@@ -42,6 +44,28 @@ public static class ServiceCollectionExtensions
         return items;
     }
 
+    private static JellyfinDbProviderFactory? LoadDatabasePlugin(CustomDatabaseOptions customProviderOptions, IApplicationPaths applicationPaths)
+    {
+        var plugin = Directory.EnumerateDirectories(applicationPaths.PluginsPath)
+            .Where(e => Path.GetFileName(e)!.StartsWith(customProviderOptions.PluginName, StringComparison.OrdinalIgnoreCase))
+            .Order()
+            .FirstOrDefault()
+            ?? throw new InvalidOperationException($"The requested custom database plugin with the name '{customProviderOptions.PluginName}' could not been found in '{applicationPaths.PluginsPath}'");
+
+        var dbProviderAssembly = Path.Combine(plugin, Path.ChangeExtension(customProviderOptions.PluginAssembly, "dll"));
+        if (!File.Exists(dbProviderAssembly))
+        {
+            throw new InvalidOperationException($"Could not find the requested assembly at '{dbProviderAssembly}'");
+        }
+
+        // we have to load the assembly without proxy to ensure maximum performance for this.
+        var assembly = Assembly.LoadFrom(dbProviderAssembly);
+        var dbProviderType = assembly.GetExportedTypes().FirstOrDefault(f => f.IsAssignableTo(typeof(IJellyfinDatabaseProvider)))
+            ?? throw new InvalidOperationException($"Could not find any type implementing the '{nameof(IJellyfinDatabaseProvider)}' interface.");
+
+        return (services) => (IJellyfinDatabaseProvider)ActivatorUtilities.CreateInstance(services, dbProviderType);
+    }
+
     /// <summary>
     /// Adds the <see cref="IDbContextFactory{TContext}"/> interface to the service collection with second level caching enabled.
     /// </summary>
@@ -55,7 +79,6 @@ public static class ServiceCollectionExtensions
         IConfiguration configuration)
     {
         var efCoreConfiguration = configurationManager.GetConfiguration<DatabaseConfigurationOptions>("database");
-        var providers = GetSupportedDbProviders();
         JellyfinDbProviderFactory? providerFactory = null;
 
         if (efCoreConfiguration?.DatabaseType is null)
@@ -80,9 +103,22 @@ public static class ServiceCollectionExtensions
             }
         }
 
-        if (!providers.TryGetValue(efCoreConfiguration.DatabaseType.ToUpperInvariant(), out providerFactory!))
+        if (efCoreConfiguration.DatabaseType.Equals("PLUGIN_PROVIDER", StringComparison.OrdinalIgnoreCase))
         {
-            throw new InvalidOperationException($"Jellyfin cannot find the database provider of type '{efCoreConfiguration.DatabaseType}'. Supported types are {string.Join(", ", providers.Keys)}");
+            if (efCoreConfiguration.CustomProviderOptions is null)
+            {
+                throw new InvalidOperationException("The custom database provider must declare the custom provider options to work");
+            }
+
+            providerFactory = LoadDatabasePlugin(efCoreConfiguration.CustomProviderOptions, configurationManager.ApplicationPaths);
+        }
+        else
+        {
+            var providers = GetSupportedDbProviders();
+            if (!providers.TryGetValue(efCoreConfiguration.DatabaseType.ToUpperInvariant(), out providerFactory!))
+            {
+                throw new InvalidOperationException($"Jellyfin cannot find the database provider of type '{efCoreConfiguration.DatabaseType}'. Supported types are {string.Join(", ", providers.Keys)}");
+            }
         }
 
         serviceCollection.AddSingleton<IJellyfinDatabaseProvider>(providerFactory!);