Adding API Endpoints for Catalog Items (#410)

* Adding new Endpoints

* update nuget packages

* Modifying API to work well with Swagger.

* Remove Swashbuckle.Core

src/Web/API/CatalogItemEndpoints/GetById.cs

@@ -0,0 +1,46 @@
+using Ardalis.ApiEndpoints;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.eShopWeb.ApplicationCore.Entities;
+using Microsoft.eShopWeb.ApplicationCore.Interfaces;
+using Swashbuckle.AspNetCore.Annotations;
+using System.Threading.Tasks;
+
+namespace Microsoft.eShopWeb.Web.API.CatalogItemEndpoints
+{
+    public class GetById : BaseAsyncEndpoint<GetByIdCatalogItemRequest, GetByIdCatalogItemResponse>
+    {
+        private readonly IAsyncRepository<CatalogItem> _itemRepository;
+
+        public GetById(IAsyncRepository<CatalogItem> itemRepository)
+        {
+            _itemRepository = itemRepository;
+        }
+
+        [HttpGet("api/catalog-items/{CatalogItemId}")]
+        [SwaggerOperation(
+            Summary = "Get a Catalog Item by Id",
+            Description = "Gets a Catalog Item by Id",
+            OperationId = "catalog-items.GetById",
+            Tags = new[] { "CatalogItemEndpoints" })
+        ]
+        public override async Task<ActionResult<GetByIdCatalogItemResponse>> HandleAsync([FromRoute]GetByIdCatalogItemRequest request)
+        {
+            var response = new GetByIdCatalogItemResponse(request.CorrelationId());
+
+            var item = await _itemRepository.GetByIdAsync(request.CatalogItemId);
+            if (item is null) return NotFound();
+
+            response.CatalogItem = new CatalogItemDto
+            {
+                Id = item.Id,
+                CatalogBrandId = item.CatalogBrandId,
+                CatalogTypeId = item.CatalogTypeId,
+                Description = item.Description,
+                Name = item.Name,
+                PictureUri = item.PictureUri,
+                Price = item.Price
+            };
+            return Ok(response);
+        }
+    }
+}