init project

Domain/AggregateModel/LinkAggregate/Link.cs

@@ -0,0 +1,61 @@
+using Base62;
+using Domain.SeedWork;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Domain.AggregateModel.LinkAggregate
+{
+    public class Link:IAggregateRoot
+    {
+        /// <summary>
+        /// 非自增主键
+        /// </summary>
+        public string ShortCode { get; private set; }
+        public string BaseUrl { get; private set; }
+        public string SuffixUrl { get; private set; }
+        public string FullUrl { get; private set; }
+        public int AppId { get; private set; }
+        public DateTime Time { get; private set; }
+
+        private Link()
+        {
+
+        }
+        /// <summary>
+        /// 创建一条新的短链接
+        /// </summary>
+        /// <param name="baseUrl"></param>
+        /// <param name="suffixUrl"></param>
+        /// <param name="appId">分配的应用id</param>
+        public Link(string baseUrl,string suffixUrl,int appId)
+        {
+            BaseUrl = baseUrl;
+            SuffixUrl = suffixUrl;
+            FullUrl = new Uri(new Uri(baseUrl),suffixUrl).ToString();
+            AppId = appId;
+            Time = DateTime.Now;
+            CalculateShortCode();
+        }
+        /// <summary>
+        /// 根据值计算短链字段
+        /// </summary>
+        /// <returns></returns>
+        private void CalculateShortCode()
+        {
+            string code;
+            using (var md5 = MD5.Create())
+            {
+                var result = md5.ComputeHash(Encoding.UTF8.GetBytes(FullUrl));
+                var res = new[] { BitConverter.ToInt64(result, 0) ,BitConverter.ToInt64(result,8)};
+                //任意取其中一条即可
+                code = res[new Random().Next(0,1)].ToBase62();
+            }
+            ShortCode = code;
+        }
+    }
+}