Restructure

1 files changed, 93 insertions, 0 deletions

diff --git a/lib/VNLib.Plugins.Extensions.Loading/src/UserLoading.cs b/lib/VNLib.Plugins.Extensions.Loading/src/UserLoading.cs
new file mode 100644
index 0000000..da090ec
--- /dev/null
+++ b/lib/VNLib.Plugins.Extensions.Loading/src/UserLoading.cs
@@ -0,0 +1,93 @@
+/*
+* Copyright (c) 2022 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Plugins.Extensions.Loading
+* File: UserLoading.cs 
+*
+* UserLoading.cs is part of VNLib.Plugins.Extensions.Loading which is part of the larger 
+* VNLib collection of libraries and utilities.
+*
+* VNLib.Plugins.Extensions.Loading is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU General Public License as published
+* by the Free Software Foundation, either version 2 of the License,
+* or (at your option) any later version.
+*
+* VNLib.Plugins.Extensions.Loading 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 
+* General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License 
+* along with VNLib.Plugins.Extensions.Loading. If not, see http://www.gnu.org/licenses/.
+*/
+
+using System;
+using System.Collections.Generic;
+
+using VNLib.Utils.Logging;
+using VNLib.Utils.Extensions;
+using VNLib.Plugins.Essentials.Users;
+
+namespace VNLib.Plugins.Extensions.Loading.Users
+{
+    /// <summary>
+    /// Contains extension methods for plugins to load the "users" system
+    /// </summary>
+    public static class UserLoading
+    {
+        public const string USER_CUSTOM_ASSEMBLY = "user_custom_asm";
+        public const string DEFAULT_USER_ASM = "VNLib.Plugins.Essentials.Users.dll";
+        public const string ONLOAD_METHOD_NAME = "OnPluginLoading";
+       
+
+        /// <summary>
+        /// Gets or loads the plugin's ambient <see cref="IUserManager"/>, with the specified user-table name,
+        /// or the default table name
+        /// </summary>
+        /// <param name="plugin"></param>
+        /// <returns>The ambient <see cref="IUserManager"/> for the current plugin</returns>
+        /// <exception cref="KeyNotFoundException"></exception>
+        /// <exception cref="ObjectDisposedException"></exception>
+        public static IUserManager GetUserManager(this PluginBase plugin)
+        {
+            plugin.ThrowIfUnloaded();
+            //Get stored or load
+            return LoadingExtensions.GetOrCreateSingleton(plugin, LoadUsers);
+        }
+
+        private static IUserManager LoadUsers(PluginBase pbase)
+        {
+            //Try to load a custom user assembly for exporting IUserManager
+            string? customAsm = pbase.PluginConfig.GetPropString(USER_CUSTOM_ASSEMBLY);
+            //See if host config defined the path
+            customAsm ??= pbase.HostConfig.GetPropString(USER_CUSTOM_ASSEMBLY);
+            //Finally default
+            customAsm ??= DEFAULT_USER_ASM;
+
+            //Try to load a custom assembly
+            AssemblyLoader<IUserManager> loader = pbase.LoadAssembly<IUserManager>(customAsm);
+            try
+            {
+                //Try to get the onload method
+                Action<object>? onLoadMethod = loader.TryGetMethod<Action<object>>(ONLOAD_METHOD_NAME);
+
+                //Call the onplugin load method
+                onLoadMethod?.Invoke(pbase);
+
+                if (pbase.IsDebug())
+                {
+                    pbase.Log.Verbose("Loading user manager from assembly {name}", loader.Resource.GetType().AssemblyQualifiedName);
+                }
+
+                //Return the loaded instance (may raise exception)
+                return loader.Resource;
+            }
+            catch
+            {
+                loader.Dispose();
+                throw;
+            }
+        }
+    }
+}
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