Added export and import of plugin archives (#885)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/PluginSystem/PluginFactory.Loading.cs

@@ -265,6 +265,14 @@ public static partial class PluginFactory
         if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.AllowUserToAddProvider, AVAILABLE_PLUGINS))
             wasConfigurationChanged = true;
 
+        // Check for the plugin import permission:
+        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.AllowUserToImportPlugins, AVAILABLE_PLUGINS))
+            wasConfigurationChanged = true;
+
+        // Check for the plugin sharing permission:
+        if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.AllowUserToSharePlugins, AVAILABLE_PLUGINS))
+            wasConfigurationChanged = true;
+
         // Check for admin settings visibility:
         if(ManagedConfiguration.IsConfigurationLeftOver(x => x.App, x => x.ShowAdminSettings, AVAILABLE_PLUGINS))
             wasConfigurationChanged = true;
@@ -377,16 +385,24 @@ public static partial class PluginFactory
         }
     }
 
-    public static async Task<PluginBase> Load(string? pluginPath, string code, CancellationToken cancellationToken = default)
+    /// <param name="pluginPath">The directory the plugin is located in, or null when the code has no directory yet.</param>
+    /// <param name="code">The Lua code of the plugin's main file.</param>
+    /// <param name="cancellationToken">Cancellation token for running the Lua code.</param>
+    /// <param name="allowedBaseDirectory">
+    /// The directory the plugin path must be nested in. Without it, the installed plugins directory
+    /// is used. Validating a plugin before its installation needs this, because the plugin lives in
+    /// a staging directory at that point and could not load any of its own Lua modules otherwise.
+    /// </param>
+    public static async Task<PluginBase> Load(string? pluginPath, string code, CancellationToken cancellationToken = default, string? allowedBaseDirectory = null)
     {
         if(ForbiddenPlugins.Check(code) is { IsForbidden: true } forbiddenState)
             return new NoPlugin($"This plugin is forbidden: {forbiddenState.Message}");
-        
+
         var state = LuaState.Create();
         if (!string.IsNullOrWhiteSpace(pluginPath))
         {
             // Add the module loader so that the plugin can load other Lua modules:
-            state.ModuleLoader = new PluginLoader(pluginPath);
+            state.ModuleLoader = new PluginLoader(pluginPath, allowedBaseDirectory);
         }
 
         // Add some useful libraries: