【修复】修复appsetting.json微信公众号配置项命名错误的问题。

【新增】增加微信公众号获取JS-Token并且全局缓存功能。
【新增】增加微信公众号获取JS-SDK使用权限签名算法。

CoreCms.Net.Utility/Helper/CommonHelper.cs

@@ -169,7 +169,7 @@ namespace CoreCms.Net.Utility.Helper
         }
         #endregion
 
-
+        #region 转MD5
         /// <summary>
         /// 转MD5
         /// </summary>
@@ -191,7 +191,8 @@ namespace CoreCms.Net.Utility.Helper
             }
             // 返回加密的字符串
             return sb.ToString();
-        }
+        } 
+        #endregion
 
         #region 获取32位md5加密
         /// <summary>
@@ -636,5 +637,49 @@ namespace CoreCms.Net.Utility.Helper
 
         #endregion
 
+        #region 获取随机字符串
+        /// <summary>
+        /// 获取随机字符串
+        /// </summary>
+        /// <returns></returns>
+        public static string GetSerialNumber()
+        {
+            var str = string.Empty;
+            Random rand = new Random();
+            var charsStr2 = new[] { 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'P', 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0' };
+            var charsLen2 = charsStr2.Length - 1;
+            //    shuffle($chars);
+            str = "";
+            for (int i = 0; i < 16; i++)
+            {
+                str += charsStr2[rand.Next(0, charsLen2)];
+            }
+            return str;
+        }
+
+        #endregion
+
+        #region Sha1签名
+        /// <summary>
+        /// Sha1签名
+        /// </summary>
+        /// <param name="str">内容</param>
+        /// <param name="encoding">编码</param>
+        /// <returns></returns>
+        public static string Sha1Signature(string str, Encoding encoding = null)
+        {
+            if (encoding == null) encoding = Encoding.UTF8;
+            var buffer = encoding.GetBytes(str);
+            var data = SHA1.Create().ComputeHash(buffer);
+            StringBuilder sub = new StringBuilder();
+            foreach (var t in data)
+            {
+                sub.Append(t.ToString("x2"));
+            }
+
+            return sub.ToString();
+        } 
+        #endregion
+
     }
 }