AspNet Core Api Restful +Swagger 实现微服务之旅 （三）

    （1）  访问Rest ful接口时 Token验证  返回数据格式封装

（一）访问时Token验证  返回数据格式封装

  1.1访问Api接口 方法 实现

        1.1.1 创建访问Restful Api帮助类

public static string MyGet = "GET";
public static string MyPost = "POST";
public static string MyPut = "PUT";
public static string MyDELETE = "DELETE";
/// <summary>
/// 访问接口信息
/// </summary>
/// <param name="JsonString">抛送的字符串</param>
/// <param name="achieveUrl">访问的路径</param>
/// <param name="PublishKey">密钥Token</param>
/// <param name="Method">访问方法</param>
/// <returns></returns>
public static string SendService(string JsonString, string achieveUrl, string PublishKey, string Method)
{

//用于返回信息的记录
var responseValue = string.Empty;
if (!string.IsNullOrEmpty(achieveUrl))
{
//基于http协议的请求响应
HttpWebRequest request = WebRequest.Create(achieveUrl) as HttpWebRequest;
//提交方法
request.Method = Method;
//设置Http标头信息
request.UserAgent = "";
//设置请求超时时间
request.Timeout = 1000 * 60 * 30;
//设置读取/写入超时时间
request.ReadWriteTimeout = 1000 * 60 * 30;
//request.Headers.Add("", "");
request.Headers.Add("Token", PublishKey);
request.ContentType = @"application/json";
//判断访问方法
if (Method != "GET" && Method != "PUT")
{
request.ContentLength = Encoding.UTF8.GetByteCount(JsonString);
if (!string.IsNullOrEmpty(JsonString))//如果传送的数据不为空，并且方法是put  
{
var encoding = new UTF8Encoding();
var bytes = Encoding.GetEncoding("UTF-8").GetBytes(JsonString);// 
request.ContentLength = bytes.Length;
using (var writeStream = request.GetRequestStream())
{
writeStream.Write(bytes, 0, bytes.Length);
}
}
}
//http请求的返回状态
using (var response = (HttpWebResponse)request.GetResponse())
{
//获取来自 服务器或接口的响应信息
using (var responseStream = response.GetResponseStream())
{
if (responseStream != null)
{
using (var reader = new StreamReader(responseStream))
{
responseValue = reader.ReadToEnd();
}
}
}
}
}
return responseValue;
}

        1.1.2  Token 加密方法

/// <summary>
/// Base64加密
/// </summary>
/// <param name="codeName">加密采用的编码方式</param>
/// <param name="source">待加密的明文</param>
/// <returns></returns>
public static string EncodeBase64(Encoding encode, string source)
{
string Result = "";
byte[] bytes = encode.GetBytes(source);
try
{
Result = Convert.ToBase64String(bytes);
}
catch
{
Result = source;
}
return Result;
}

/// <summary>
/// Base64加密，采用utf8编码方式加密
/// </summary>
/// <param name="source">待加密的明文</param>
/// <returns>加密后的字符串</returns>
public static string EncodeBase64(string source)
{
return EncodeBase64(Encoding.UTF8, source);
}

     1.1.3 获取本地IP 进行加密 用作Token

public string GetAddressIP()
{
///获取本地的IP地址
string AddressIP = string.Empty;
foreach (IPAddress _IPAddress in Dns.GetHostEntry(Dns.GetHostName()).AddressList)
{
if (_IPAddress.AddressFamily.ToString() == "InterNetwork")
{
AddressIP = _IPAddress.ToString();
}
}
return AddressIP;
}

     1.1.4  读取Json文件 用作 访问接口抛送的内容

public static string GetFileJson(string filepath)
{
string json = string.Empty;
using (FileStream fs = new FileStream(filepath, FileMode.Open, System.IO.FileAccess.Read, FileShare.ReadWrite))
{
using (StreamReader sr = new StreamReader(fs, Encoding.GetEncoding("gb2312")))
{
json = sr.ReadToEnd().ToString();
}
}
return json;
}

  1.1.5 Json文件内容

{
"Name": "Szl",
"Age": "30",
"Address": "河南",
"XXXXXX": "测试数据"
}

 1.1.6 调用接口

// GET: Home
public ActionResult Index()
{
string serviceURL = @"http://10.118.4.1x8:8082/szl/SzlAPI/Post";
string JsonString = GetFileJson(@"D:VS2015DemoRestServiceTestUIjson.json");
string PublishKey = GetAddressIP();
ViewBag.Data = SendService(JsonString, serviceURL, EncodeBase64(PublishKey), "POST");
return View();
}

  1.2 Rest Api 接口声明

       1.2.1接口方法

/// <summary>
/// AspNet Core Post请求
/// </summary>
/// <param name="value">User类</param>
/// <remarks>
///访问参数
/// POST
/// {
/// "value": "0e7ad584-7788-4ab1-95a6-ca0a5b444cbb",
/// }
///
/// </remarks>
/// <response code="201">返回新创建项</response>
/// <response code="400">如果为空时</response>

[HttpPost]
[ProducesResponseType(typeof(User), 201)]
[ProducesResponseType(typeof(User), 400)]
public User Post([FromBody] User value)
{
//第二种接收值得方法
//Stream stream = HttpContext.Request.Body;
//byte[] buffer = new byte[HttpContext.Request.ContentLength.Value];
//stream.Read(buffer, 0, buffer.Length);
//string content = Encoding.UTF8.GetString(buffer);
////然后Json转换
User Users = new User() { UserAddress = "北京", UserAge = "身体健康无颈椎病", UserName = "Szl", XXXXXX = "注意大小写" };
return Users;
}

   1.2.2 User类

public class User
{
/// <remarks>
/// 名称
/// </remarks>

public string UserName { get; set; } = "名称";
/// <summary>
/// 年龄
/// </summary>
public string UserAge { get; set; }
/// <summary>
/// 地址
/// </summary>

public string UserAddress { get; set; }

/// <summary>
/// 测试字段
/// </summary>
public string XXXXXX { get; set; }

}

  1.3 添加 帮助类 WebApiAuthorizationFilter 对接口访问者身份Token 解密 获取访问者IP 进行验证，对返回结果进行封装

/// <summary>
///
/// </summary>
public class WebApiAuthorizationFilter : IAuthorizationFilter
{
/// <summary>
/// 调用者的身份验证
/// </summary>
/// <param name="context"></param>
public void OnAuthorization(AuthorizationFilterContext context)
{
//string IP = ((Microsoft.AspNetCore.Http.Internal.DefaultConnectionInfo)context.HttpContext.Connection).LocalIpAddress.ToString();
//获取客户端IP地址
string clientIP = ((Microsoft.AspNetCore.Http.Internal.DefaultConnectionInfo)context.HttpContext.Connection).RemoteIpAddress.ToString();
//获取Token信息
var Token = context.HttpContext.Request.Headers["Token"].FirstOrDefault();
//验证Token
if (Token == "")
{
context.Result = new ObjectResult(new { Success = false, code = 404, msg = "请查看令牌是否包含！", data = "null" });
}
else if (clientIP == DecodeBase64(Token))
{
return;
}
else
{
context.Result = new ObjectResult(new { Success = false, code = 404, msg = "请查看令牌是否正确！", data = "null" });
}
}

/// <summary>
/// Base64解密
/// </summary>
/// <param name="codeName">解密采用的编码方式，注意和加密时采用的方式一致</param>
/// <param name="result">待解密的密文</param>
/// <returns>解密后的字符串</returns>
public static string DecodeBase64(Encoding codeName, string result)
{
string decode = "";
byte[] bytes = Convert.FromBase64String(result);
try
{
decode = codeName.GetString(bytes);
}
catch
{
decode = result;
}
return decode;
}

/// <summary>
/// Base64解密，采用utf8编码方式解密
/// </summary>
/// <param name="result">待解密的密文</param>
/// <returns>解密后的字符串</returns>
public static string DecodeBase64(string result)
{
return DecodeBase64(Encoding.UTF8, result);
}
}

   1.4 在Startup.cs中注册服务启用 WebApiAuthorizationFilter文件

services.AddMvc(options =>
{
//身份验证不通过是返回结果统一化
options.Filters.Add(typeof(WebApiAuthorizationFilter));
options.RespectBrowserAcceptHeader = true;
});

不加Token的结果

访问正确结果

注意 返回结果中的data的字段名 大小写的变化  前边的四位默认小写了 这是框架本身Json序列化的结果

解决方法  在Startup.cs中注册服务

services.AddMvc()
            //默认返回值 大小写不变
           .AddJsonOptions(op => op.SerializerSettings.ContractResolver =new Newtonsoft.Json.Serialization.DefaultContractResolver());

 今天结束 本来下面的也要说说的太晚了留着明天吧

      （2）  程序错误时  返回数据格式封装

      （3）  返回结果包装

      （4）  访问方法时 参数必填与非必填的声明