Support installing from local path

Flow.Launcher.Core/Plugin/PluginManager.cs

@@ -2,6 +2,7 @@
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.IO;
+using System.IO.Compression;
 using System.Linq;
 using System.Text.Json;
 using System.Threading;
@@ -633,6 +634,42 @@ namespace Flow.Launcher.Core.Plugin
             }
         }
 
+        public static async Task InstallPluginAndCheckRestartAsync(string filePath)
+        {
+            UserPlugin plugin;
+            try
+            {
+                using ZipArchive archive = ZipFile.OpenRead(filePath);
+                var pluginJsonPath = archive.Entries.FirstOrDefault(x => x.Name == "plugin.json") ??
+                    throw new FileNotFoundException("The zip file does not contain a plugin.json file.");
+                var pluginJsonEntry = archive.GetEntry(pluginJsonPath.ToString()) ??
+                    throw new FileNotFoundException("The zip file does not contain a plugin.json file.");
+                
+                using Stream stream = pluginJsonEntry.Open();
+                plugin = JsonSerializer.Deserialize<UserPlugin>(stream);
+                plugin.IcoPath = "Images\\zipfolder.png";
+                plugin.LocalInstallPath = filePath;
+            }
+            catch (Exception e)
+            {
+                API.LogException(ClassName, "Failed to validate zip file", e);
+                API.ShowMsgError(API.GetTranslation("ZipFileNotHavePluginJson"));
+                return;
+            }
+
+            if (FlowSettings.ShowUnknownSourceWarning)
+            {
+                if (!InstallSourceKnown(plugin.Website)
+                    && API.ShowMsgBox(string.Format(
+                        API.GetTranslation("InstallFromUnknownSourceSubtitle"), Environment.NewLine),
+                        API.GetTranslation("InstallFromUnknownSourceTitle"),
+                        MessageBoxButton.YesNo) == MessageBoxResult.No)
+                    return;
+            }
+
+            await InstallPluginAndCheckRestartAsync(plugin);
+        }
+
         public static async Task UninstallPluginAndCheckRestartAsync(PluginMetadata oldPlugin)
         {
             if (API.ShowMsgBox(
@@ -913,6 +950,24 @@ namespace Flow.Launcher.Core.Plugin
             }
         }
 
+        private static bool InstallSourceKnown(string url)
+        {
+            var pieces = url.Split('/');
+
+            if (pieces.Length < 4)
+                return false;
+
+            var author = pieces[3];
+            var acceptedSource = "https://github.com";
+            var constructedUrlPart = string.Format("{0}/{1}/", acceptedSource, author);
+
+            return url.StartsWith(acceptedSource) &&
+                API.GetAllPlugins().Any(x =>
+                    !string.IsNullOrEmpty(x.Metadata.Website) &&
+                    x.Metadata.Website.StartsWith(constructedUrlPart)
+                );
+        }
+
         #endregion
     }
 }

Flow.Launcher/Languages/en.xaml

@@ -204,6 +204,12 @@
     <system:String x:Key="UpdatePromptSubtitle">{0} by {1} {2}{2}Would you like to update this plugin?</system:String>
     <system:String x:Key="DownloadingPlugin">Downloading plugin</system:String>
     <system:String x:Key="AutoRestartAfterChange">Automatically restart after installing/uninstalling/updating plugins in plugin store</system:String>
+    <system:String x:Key="ZipFileNotHavePluginJson">Zip file does not have a valid plugin.json configuration</system:String>
+    <system:String x:Key="InstallFromUnknownSourceTitle">Installing from an unknown source</system:String>
+    <system:String x:Key="InstallFromUnknownSourceSubtitle">This plugin is from an unknown source and it may contain potential risks!{0}{0}Please ensure you understand where this plugin is from and that it is safe.{0}{0}Would you like to continue still?{0}{0}(You can switch off this warning in general section of setting window)</system:String>
+    <system:String x:Key="ZipFiles">Zip files</system:String>
+    <system:String x:Key="SelectZipFile">Please select zip file</system:String>
+    <system:String x:Key="installLocalPluginTooltip">Install plugin from local path</system:String>
 
     <!--  Setting Theme  -->
     <system:String x:Key="theme">Theme</system:String>

Flow.Launcher/SettingPages/ViewModels/SettingsPanePluginStoreViewModel.cs

@@ -1,7 +1,10 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using System.Windows.Forms;
 using CommunityToolkit.Mvvm.Input;
+using Flow.Launcher.Core.Plugin;
 using Flow.Launcher.Plugin;
 using Flow.Launcher.ViewModel;
 
@@ -96,6 +99,36 @@ public partial class SettingsPanePluginStoreViewModel : BaseModel
         }
     }
 
+    [RelayCommand]
+    private async Task InstallPluginAsync()
+    {
+        var file = GetFileFromDialog(
+            App.API.GetTranslation("SelectZipFile"),
+            $"{App.API.GetTranslation("ZipFiles")} (*.zip)|*.zip");
+
+        if (!string.IsNullOrEmpty(file))
+            await PluginManager.InstallPluginAndCheckRestartAsync(file);
+    }
+
+    private static string GetFileFromDialog(string title, string filter = "")
+    {
+        var dlg = new OpenFileDialog
+        {
+            InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile) + "\\Downloads",
+            Multiselect = false,
+            CheckFileExists = true,
+            CheckPathExists = true,
+            Title = title,
+            Filter = filter
+        };
+
+        return dlg.ShowDialog() switch
+        {
+            DialogResult.OK => dlg.FileName,
+            _ => string.Empty
+        };
+    }
+
     public bool SatisfiesFilter(PluginStoreItemViewModel plugin)
     {
         // Check plugin language

Flow.Launcher/SettingPages/Views/SettingsPanePluginStore.xaml

@@ -92,6 +92,13 @@
                         </ui:MenuFlyout>
                     </ui:FlyoutService.Flyout>
                 </Button>
+                <Button
+                    Height="34"
+                    Margin="0 0 10 0"
+                    Command="{Binding InstallPluginCommand}"
+                    ToolTip="{DynamicResource installLocalPluginTooltip}">
+                    <ui:FontIcon FontSize="14" Glyph="&#xE8DA;" />
+                </Button>
                 <TextBox
                     Name="PluginStoreFilterTextbox"
                     Width="150"