public async Task <IdentityUser> Handle(LoginQuery request, CancellationToken cancellationToken)
{
var user = await _context.Users.FirstOrDefaultAsync(x => x.Email == request._email, cancellationToken);
if (user == null)
{
return(null);
}
return(_passwordService.ComparePasswordHash(request._password, user.PasswordHash) ? user : null);
}