first commit

BookHive/Endpoints/Books/GetBookEndpoint.cs

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+using BookHive.DTO.Book;
+using BookHive.Models;
+using BookHive.Repositories;
+using BookHive.Specifications.Books;
+using FastEndpoints;
+
+namespace BookHive.Endpoints.Books;
+
+public class BookRequest
+{
+    public int Id { get; set; }
+}
+
+public class GetBookEndpoint(BookRepository bookRepository, AutoMapper.IMapper mapper) : Endpoint<BookRequest, GetBookDetailsDto>
+{
+    public override void Configure()
+    {
+        Get("/books/{@Id}/", x => new { x.Id });
+        AllowAnonymous();
+    }
+
+    public override async Task HandleAsync(BookRequest req, CancellationToken ct)
+    {
+        Book? book = await bookRepository.SingleOrDefaultAsync(new GetBookByIdSpec(req.Id), ct);
+
+        if (book is null)
+        {
+            await Send.NoContentAsync(ct);
+            return;
+        }
+
+        await Send.OkAsync(mapper.Map<GetBookDetailsDto>(book), ct);
+    }
+}