Fix possible exception when extracting zip file

Author: Jack251970

Plugins/Flow.Launcher.Plugin.PluginsManager/Languages/en.xaml

@@ -46,6 +46,9 @@
     <system:String x:Key="plugin_pluginsmanager_update_all_success_no_restart">{0} plugins successfully updated. Please restart Flow.</system:String>
     <system:String x:Key="plugin_pluginsmanager_plugin_modified_error">Plugin {0} has already been modified. Please restart Flow before making any further changes.</system:String>
 
+    <system:String x:Key="plugin_pluginsmanager_invalid_zip_title">Invalid zip installer file</system:String>
+    <system:String x:Key="plugin_pluginsmanager_invalid_zip_subtitle">Please check if there is plugin.json in {0}</system:String>
+
     <!--  Plugin Infos  -->
     <system:String x:Key="plugin_pluginsmanager_plugin_name">Plugins Manager</system:String>
     <system:String x:Key="plugin_pluginsmanager_plugin_description">Management of installing, uninstalling or updating Flow Launcher plugins</system:String>

Plugins/Flow.Launcher.Plugin.PluginsManager/PluginsManager.cs

@@ -242,6 +242,18 @@ internal async ValueTask<List<Result>> RequestUpdateAsync(string search, Cancell
             if (FilesFolders.IsZipFilePath(search, checkFileExists: true))
             {
                 pluginFromLocalPath = Utilities.GetPluginInfoFromZip(search);
+
+                if (pluginFromLocalPath == null) return new List<Result>
+                {
+                    new()
+                    {
+                        Title = Context.API.GetTranslation("plugin_pluginsmanager_invalid_zip_title"),
+                        SubTitle = string.Format(Context.API.GetTranslation("plugin_pluginsmanager_invalid_zip_subtitle"),
+                            search),
+                        IcoPath = icoPath
+                    }
+                };
+
                 pluginFromLocalPath.LocalInstallPath = search;
                 updateFromLocalPath = true;
             }
@@ -559,6 +571,20 @@ internal List<Result> InstallFromLocalPath(string localPath)
         {
             var plugin = Utilities.GetPluginInfoFromZip(localPath);
 
+            if (plugin == null)
+            {
+                return new List<Result>
+                {
+                    new()
+                    {
+                        Title = Context.API.GetTranslation("plugin_pluginsmanager_invalid_zip_title"),
+                        SubTitle = string.Format(Context.API.GetTranslation("plugin_pluginsmanager_invalid_zip_subtitle"),
+                            localPath),
+                        IcoPath = icoPath
+                    }
+                };
+            }
+
             plugin.LocalInstallPath = localPath;
 
             return new List<Result>

Plugins/Flow.Launcher.Plugin.PluginsManager/Utilities.cs

@@ -65,9 +65,7 @@ internal static UserPlugin GetPluginInfoFromZip(string filePath)
 
             using (ZipArchive archive = System.IO.Compression.ZipFile.OpenRead(filePath))
             {
-                var pluginJsonPath = archive.Entries.FirstOrDefault(x => x.Name == "plugin.json").ToString();
-                ZipArchiveEntry pluginJsonEntry = archive.GetEntry(pluginJsonPath);
-
+                var pluginJsonEntry = archive.Entries.FirstOrDefault(x => x.Name == "plugin.json");
                 if (pluginJsonEntry != null)
                 {
                     using Stream stream = pluginJsonEntry.Open();