initial commit

Core/Application/Features/FileDocumentManager/Queries/GetDocument.cs

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+using Application.Common.Services.FileDocumentManager;
+using FluentValidation;
+using MediatR;
+
+namespace Application.Features.FileDocumentManager.Queries;
+
+
+public class GetDocumentResult
+{
+    public byte[]? Data { get; init; }
+}
+
+public class GetDocumentRequest : IRequest<GetDocumentResult>
+{
+    public string? DocumentName { get; init; }
+}
+
+public class GetDocumentValidator : AbstractValidator<GetDocumentRequest>
+{
+    public GetDocumentValidator()
+    {
+        RuleFor(x => x.DocumentName)
+            .NotEmpty();
+    }
+}
+
+public class GetDocumentHandler : IRequestHandler<GetDocumentRequest, GetDocumentResult>
+{
+    private readonly IFileDocumentService _documentService;
+
+    public GetDocumentHandler(IFileDocumentService documentService)
+    {
+        _documentService = documentService;
+    }
+
+    public async Task<GetDocumentResult> Handle(GetDocumentRequest request, CancellationToken cancellationToken)
+    {
+        var result = await _documentService.GetFileAsync(request.DocumentName ?? "", cancellationToken);
+
+        return new GetDocumentResult { Data = result };
+    }
+}
+
+