luticate2-api/Luticate2.Utils/Dbo/PaginatedRequest/LuPaginatedRequestBinder.cs

using System.Threading.Tasks;
using Luticate2.Utils.Controllers;
using Luticate2.Utils.Dbo.Filter;
using Luticate2.Utils.Dbo.OrderBy;
using Microsoft.AspNetCore.Mvc.ModelBinding;

namespace Luticate2.Utils.Dbo.PaginatedRequest
{
    public class LuPaginatedRequestBinder : IModelBinder
    {
        public Task BindModelAsync(ModelBindingContext bindingContext)
        {
            var filterValue = bindingContext.ValueProvider.GetValue("filter");
            var orderByValue = bindingContext.ValueProvider.GetValue("orderBy");
            var pageValue = bindingContext.ValueProvider.GetValue("page");
            var perPageValue = bindingContext.ValueProvider.GetValue("perPage");

            var filter = LuFilterBinder.FromString(filterValue.FirstValue);
            if (!filter)
            {
                throw new LuResultException(filter.To<object>());
            }

            var orderBy = LuOrderByBinder.FromString(orderByValue.FirstValue);
            if (!orderBy)
            {
                throw new LuResultException(orderBy.To<object>());
            }

            var dbo = new LuPaginatedRequestDbo
            {
                Filter = filter.Data,
                OrderBy = orderBy.Data,
                Page = pageValue.FirstValue == null ? 0 : int.Parse(pageValue.FirstValue),
                PerPage = perPageValue.FirstValue == null ? int.MaxValue : int.Parse(perPageValue.FirstValue)
            };

            bindingContext.Result = ModelBindingResult.Success(dbo);

            return Task.FromResult(0);
        }
    }

    public class LuPaginatedRequestBinderProvider : IModelBinderProvider
    {
        public IModelBinder GetBinder(ModelBinderProviderContext context)
        {
            if (context.Metadata.ModelType == typeof(LuPaginatedRequestDbo))
            {
                return new LuPaginatedRequestBinder();
            }
            return null;
        }
    }
}