WebAPISignalRChat/Backend/Diligent.WebAPI.Host/Mediator/Authentication/Handlers/LoginUserHandler.cs

using AutoMapper;
using Diligent.WebAPI.Business.Interfaces;
using Diligent.WebAPI.Data.Entities;
using Diligent.WebAPI.Host.DTOs.Customer;
using Diligent.WebAPI.Host.Mediator.Authentication.Queries;
using MediatR;
using Microsoft.AspNetCore.Identity;

namespace Diligent.WebAPI.Host.Mediator.Authentication.Handlers
{
    public class LoginUserHandler : IRequestHandler<LoginUserQuery, CustomerReadDTO>
    {
        private readonly UserManager<Customer> _customerManager;
        private readonly IAuthenticationService _authenticationService;
        private readonly IMapper _mapper;
        private readonly ICustomerService _customerService;

        public LoginUserHandler(UserManager<Customer> customerManager, IAuthenticationService authenticationService,
            IMapper mapper, ICustomerService customerService)
        {
            _customerManager = customerManager;
            _authenticationService = authenticationService;
            _mapper = mapper;
            _customerService = customerService;
        }
        public async Task<CustomerReadDTO> Handle(LoginUserQuery request, CancellationToken cancellationToken)
        {
            var customerLoginDTO = request.CustomerLoginDTO;
            if (!await _authenticationService.ValidateCustomer(customerLoginDTO.Username, customerLoginDTO.Password))
                throw new BadHttpRequestException("Authentication failed.Wrong Username or password");

            Customer customer = await _customerService.GetCustomer(customerLoginDTO.Username);
            var customerReadDTO = _mapper.Map<CustomerReadDTO>(customer);
            customerReadDTO.Token = await _authenticationService.GenerateToken();
            customerReadDTO.Roles = (List<string>)await _customerManager.GetRolesAsync(customer);
            return customerReadDTO;
        }
    }
}