BackEnd/Timeline/Filters/CatchEntityAlreadyExistExceptionFilter.cs


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using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Timeline.Models.Http;
using Timeline.Services;

namespace Timeline.Filters
{
    public class CatchEntityAlreadyExistExceptionFilter : IExceptionFilter
    {
        private static string MakeMessage(EntityAlreadyExistException e)
        {
            return string.Format(Resource.MessageEntityAlreadyExist, e.EntityType.Name, e.GenerateConstraintString());
        }

        private static CommonResponse MakeCommonResponse(EntityAlreadyExistException e)
        {
            return new CommonResponse(e.EntityType.ConflictErrorCode, MakeMessage(e));
        }

        public void OnException(ExceptionContext context)
        {
            if (context.Exception is EntityAlreadyExistException e)
            {
                if (context.HttpContext.Request.Path.StartsWithSegments("/api/v2"))
                {
                    context.Result = new UnprocessableEntityObjectResult(new ErrorResponse(ErrorResponse.EntityExist, "An entity with given key already exists."));
                }
                else
                {
                    context.Result = new BadRequestObjectResult(MakeCommonResponse(e));
                }
            }
        }
    }
}