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CheckDiscountCouponAttribute.cs

using System.Net;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.Extensions.Primitives;
using Nop.Core;
using Nop.Core.Domain.Customers;
using Nop.Core.Http.Extensions;
using Nop.Data;
using Nop.Services.Customers;
using Nop.Services.Discounts;
using Nop.Services.Localization;
using Nop.Services.Messages;

namespace Nop.Web.Framework.Mvc.Filters;

/// 
/// Represents filter attribute that checks and applied discount coupon code to customer
/// 
public sealed class CheckDiscountCouponAttribute : TypeFilterAttribute
{
    #region Ctor

    /// 
    /// Create instance of the filter attribute
    /// 
    public CheckDiscountCouponAttribute() : base(typeof(CheckDiscountCouponFilter))
    {
    }

    #endregion

    #region Nested filter

    /// 
    /// Represents a filter that checks and applied discount coupon code to customer
    /// 
    private class CheckDiscountCouponFilter : IAsyncActionFilter
    {
        #region Fields

        protected readonly ICustomerService _customerService;
        protected readonly IDiscountService _discountService;
        protected readonly ILocalizationService _localizationService;
        protected readonly INotificationService _notificationService;
        protected readonly IWorkContext _workContext;

        #endregion

        #region Ctor

        public CheckDiscountCouponFilter(ICustomerService customerService,
            IDiscountService discountService,
            ILocalizationService localizationService,
            INotificationService notificationService,
            IWorkContext workContext)
        {
            _customerService = customerService;
            _discountService = discountService;
            _localizationService = localizationService;
            _notificationService = notificationService;
            _workContext = workContext;
        }

        #endregion

        #region Utilities

        /// 
        /// Called asynchronously before the action, after model binding is complete.
        /// 
        /// A context for action filters
        /// A task that represents the asynchronous operation
        private async Task CheckDiscountCouponAsync(ActionExecutingContext context)
        {
            ArgumentNullException.ThrowIfNull(context);

            //check request query parameters
            if (!context.HttpContext.Request.Query.Any())
                return;

            //only in GET requests
            if (!context.HttpContext.Request.IsGetRequest())
                return;

            if (!DataSettingsManager.IsDatabaseInstalled())
                return;

            var customer = await _workContext.GetCurrentCustomerAsync();

            //ignore search engines
            if (customer.IsSearchEngineAccount())
                return;

            //try to get discount coupon code
            var queryKey = NopDiscountDefaults.DiscountCouponQueryParameter;
            if (!context.HttpContext.Request.Query.TryGetValue(queryKey, out var couponCodes) || StringValues.IsNullOrEmpty(couponCodes))
                return;

            //get validated discounts with passed coupon codes

            var validCouponCodes = new List();
            var discounts = await couponCodes
                .SelectManyAwait(async couponCode => await _discountService.GetAllDiscountsAsync(couponCode: couponCode))
                .Distinct()
                .ToListAsync();

            foreach (var discount in discounts)
            {
                var result = await _discountService.ValidateDiscountAsync(discount, customer, [.. couponCodes]);
                if (!result.IsValid)
                    continue;

                //apply discount coupon codes to customer
                await _customerService.ApplyDiscountCouponCodeAsync(customer, discount.CouponCode);

                validCouponCodes.Add(discount.CouponCode);
            }

            //show notifications for activated coupon codes
            var locale = await _localizationService.GetResourceAsync("ShoppingCart.DiscountCouponCode.Activated");
            foreach (var validCouponCode in validCouponCodes.Distinct())
            {
                _notificationService.SuccessNotification(string.Format(locale, WebUtility.HtmlEncode(validCouponCode)));
            }

            //show notifications for invalid coupon codes
            var invalidLocale = await _localizationService.GetResourceAsync("ShoppingCart.DiscountCouponCode.Invalid");
            foreach (var invalidCouponCode in couponCodes.Except(validCouponCodes.Distinct()))
            {
                _notificationService.WarningNotification(string.Format(invalidLocale, WebUtility.HtmlEncode(invalidCouponCode)));
            }
        }

        #endregion

        #region Methods

        /// 
        /// Called asynchronously before the action, after model binding is complete.
        /// 
        /// A context for action filters
        /// A delegate invoked to execute the next action filter or the action itself
        /// A task that represents the asynchronous operation
        public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {
            await CheckDiscountCouponAsync(context);
            if (context.Result == null)
                await next();
        }

        #endregion
    }

    #endregion
}