WebApi + ClientApp, GraphQL, Reflection

Events-WebApi/Events.FilesAPI/Features/RegistrationsExcel/Download/RegistrationsExcelFileLocator.cs

@@ -0,0 +1,27 @@
+using Events.FilesAPI.Infrastructure.Files;
+using Events.FilesAPI.Infrastructure.Options;
+using Microsoft.Extensions.Options;
+
+namespace Events.FilesAPI.Features.RegistrationsExcel.Download;
+
+public sealed class RegistrationsExcelFileLocator(
+  IHostEnvironment hostEnvironment,
+  IOptions<GeneratedFilesOptions> generatedFilesOptions)
+{
+  public GeneratedFileReference? TryGet(int eventId)
+  {
+    string rootPath = Path.IsPathRooted(generatedFilesOptions.Value.OutputPath)
+      ? generatedFilesOptions.Value.OutputPath
+      : Path.GetFullPath(Path.Combine(hostEnvironment.ContentRootPath, generatedFilesOptions.Value.OutputPath));
+
+    string excelPath = Path.Combine(rootPath, $"{eventId}.xlsx");
+    if (!File.Exists(excelPath))
+      return null;
+
+    return new GeneratedFileReference
+    {
+      FileName = Path.GetFileName(excelPath),
+      PhysicalPath = excelPath
+    };
+  }
+}