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NotificationService.cs

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Newtonsoft.Json;
using Nop.Core;
using Nop.Services.Logging;

namespace Nop.Services.Messages;

/// 
/// Notification service
/// 
public partial class NotificationService : INotificationService
{
    #region Fields

    protected readonly IHttpContextAccessor _httpContextAccessor;
    protected readonly ILogger _logger;
    protected readonly ITempDataDictionaryFactory _tempDataDictionaryFactory;
    protected readonly IWorkContext _workContext;

    #endregion

    #region Ctor

    public NotificationService(IHttpContextAccessor httpContextAccessor,
        ILogger logger,
        ITempDataDictionaryFactory tempDataDictionaryFactory,
        IWorkContext workContext)
    {
        _httpContextAccessor = httpContextAccessor;
        _logger = logger;
        _tempDataDictionaryFactory = tempDataDictionaryFactory;
        _workContext = workContext;
    }

    #endregion

    #region Utilities

    /// 
    /// Save message into TempData
    /// 
    /// Notification type
    /// Message
    /// A value indicating whether the message should not be encoded
    protected virtual void PrepareTempData(NotifyType type, string message, bool encode = true)
    {
        var context = _httpContextAccessor.HttpContext;
        var tempData = _tempDataDictionaryFactory.GetTempData(context);

        //Messages have stored in a serialized list
        var messages = tempData.TryGetValue(NopMessageDefaults.NotificationListKey, out var value) 
            ? JsonConvert.DeserializeObject>(value.ToString())
            : new List();

        messages.Add(new NotifyData
        {
            Message = message,
            Type = type,
            Encode = encode
        });

        tempData[NopMessageDefaults.NotificationListKey] = JsonConvert.SerializeObject(messages);
    }

    /// 
    /// Log exception
    /// 
    /// Exception
    /// A task that represents the asynchronous operation
    protected virtual async Task LogExceptionAsync(Exception exception)
    {
        if (exception == null)
            return;
        var customer = await _workContext.GetCurrentCustomerAsync();
        await _logger.ErrorAsync(exception.Message, exception, customer);
    }

    #endregion

    #region Methods

    /// 
    /// Display notification
    /// 
    /// Notification type
    /// Message
    /// A value indicating whether the message should not be encoded
    public virtual void Notification(NotifyType type, string message, bool encode = true)
    {
        PrepareTempData(type, message, encode);
    }

    /// 
    /// Display success notification
    /// 
    /// Message
    /// A value indicating whether the message should not be encoded
    public virtual void SuccessNotification(string message, bool encode = true)
    {
        PrepareTempData(NotifyType.Success, message, encode);
    }

    /// 
    /// Display warning notification
    /// 
    /// Message
    /// A value indicating whether the message should not be encoded
    public virtual void WarningNotification(string message, bool encode = true)
    {
        PrepareTempData(NotifyType.Warning, message, encode);
    }

    /// 
    /// Display error notification
    /// 
    /// Message
    /// A value indicating whether the message should not be encoded
    public virtual void ErrorNotification(string message, bool encode = true)
    {
        PrepareTempData(NotifyType.Error, message, encode);
    }

    /// 
    /// Display error notification
    /// 
    /// Exception
    /// A value indicating whether exception should be logged
    /// A task that represents the asynchronous operation
    public virtual async Task ErrorNotificationAsync(Exception exception, bool logException = true)
    {
        if (exception == null)
            return;

        if (logException)
            await LogExceptionAsync(exception);

        ErrorNotification(exception.Message);
    }

    #endregion
}