ofbapi/OFBButte.Application/Users/AddUser.cs

using OFBButte.Application.Database;
using OFBButte.Application.Exceptions;
using OFBButte.Entities;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace OFBButte.Application.Users
{
    public class AddUser
    {
        private readonly IOFBContext context;
        private readonly IPasswordHasher hasher;
        public AddUser(IOFBContext context, IPasswordHasher hasher)
        {
            this.context = context;
            this.hasher = hasher;
        }

        public User Handle(string email, string password)
        {
            // Check to see if email already exists
            var existingUser = context.Users.FirstOrDefault(u => u.Email == email);
            if (existingUser != null)
                throw new ValidationException("User with email already exists");

            // Create the new user
            var user = new Entities.User()
            {
                Email = email,
                CreatedDate = DateTime.Now,
                Password = hasher.HashPassword(password)
            };

            // Save to db
            context.Users.Add(user);
            context.SaveChanges();
            return user;
        }
    }
}