Finished converter plugin

src/HopFrame.Web/Services/Implementation/FileService.cs

@@ -0,0 +1,31 @@
+using HopFrame.Web.Components.Pages;
+using Microsoft.AspNetCore.Components.Forms;
+using Microsoft.JSInterop;
+
+namespace HopFrame.Web.Services.Implementation;
+
+internal sealed class FileService(IJSRuntime runtime) : IFileService {
+    
+    public async Task DownloadFile(string name, byte[] data) {
+        using var stream = new DotNetStreamReference(new MemoryStream(data));
+
+        await runtime.InvokeVoidAsync("downloadFileFromStream", name, stream);
+    }
+    
+    public Task<IBrowserFile> UploadFile() {
+        var result = new TaskCompletionSource<IBrowserFile>();
+        
+        if (HopFrameTablePage.CurrentInstance is null)
+            result.SetException(new InvalidOperationException("No table page visible"));
+
+        HopFrameTablePage.CurrentInstance!.OnFileUpload = files => {
+            result.SetResult(files.First());
+            HopFrameTablePage.CurrentInstance.OnFileUpload = null;
+            return Task.CompletedTask;
+        };
+
+        runtime.InvokeVoidAsync("triggerClick", HopFrameTablePage.CurrentInstance.FileInputElement!.Element);
+        return result.Task;
+    }
+    
+}