PDFEngineAPI/BlackRock.Reporting.API/Mediator/AuthenticationMediator/Commands/LoginCommand.cs

using BlackRock.Reporting.API.Authentication;
using BlackRock.Reporting.API.Core.Models;
using BlackRock.Reporting.API.Mediator.AuthenticationMediator.Models;
using BlackRock.Reporting.API.Mediator.UserMediator.Model;
using MediatR;
using Microsoft.AspNetCore.Identity;

namespace BlackRock.Reporting.API.Mediator.AuthenticationMediator.Commands
{
    public class LoginCommand : IRequest<Result<CredentialsCommand>>
    {
        public string Username { get; set; }
        public string Password { get; set; }
    }

    public class LoginCommandHandlers : IRequestHandler<LoginCommand, Result<CredentialsCommand>>
    {
        private readonly ILogger<LoginCommand> logger;
        private readonly IJwtManager jwtManager;
        private readonly IRefreshTokenManager refreshTokenManager;
        private readonly UserManager<ApplicationUser> userManager;

        public LoginCommandHandlers(ILogger<LoginCommand> logger, IJwtManager jwtManager, IRefreshTokenManager refreshTokenManager, UserManager<ApplicationUser> userManager)
        {
            this.logger = logger;
            this.jwtManager = jwtManager;
            this.refreshTokenManager = refreshTokenManager;
            this.userManager = userManager;
        }
        public async Task<Result<CredentialsCommand>> Handle(LoginCommand command, CancellationToken cancellationToken)
        {
            if (command is null)
                throw new ArgumentException($"Parameter {nameof(command)} must not be null");

            try
            {
                var user = await userManager.FindByNameAsync(command.Username);
                if (user != null && await userManager.CheckPasswordAsync(user, command.Password))
                {
                    var token = jwtManager.GenerateToken(command.Username);
                    await refreshTokenManager.RemoveRefreshToken(user);
                    var refreshToken = await refreshTokenManager.GenerateRefreshToken(user);
                    return new Result<CredentialsCommand>
                    {
                        Data = new CredentialsCommand
                        {
                            RefreshToken = refreshToken,
                            JwtToken = token
                        }
                    };
                }
                return new Result<CredentialsCommand>
                {
                    IsSuccess = false,
                    Error = "Invalid username and password"
                };
            }
            catch (Exception ex)
            {
                logger.LogError(ex, "Faild login");
                return new Result<CredentialsCommand> { IsSuccess = false, Error = "Faild login." };
            }
        }
    }
}