标签：cep and 逻辑 public 开发 nts ken 用户名 并且
在WEB Api中，引入了面向切面编程（AOP）的思想，在某些特定的位置可以插入特定的Filter进行过程拦截处理。引入了这一机制可以更好地践行DRY(Don’t Repeat Yourself)思想，通过Filter能统一地对一些通用逻辑进行处理，如：权限校验、参数加解密、参数校验等方面我们都可以利用这一特性进行统一处理，今天我们来介绍Filter的开发、使用以及讨论他们的执行顺序。
一、Filter的开发和调用
在默认的WebApi中，框架提供了三种Filter，他们的功能和运行条件如下表所示：
|
Filter 类型 |
实现的接口 |
描述 |
|
Authorization |
IAuthorizationFilter |
最先运行的Filter，被用作请求权限校验 |
|
Action |
IActionFilter |
在Action运行的前、后运行 |
|
Exception |
IExceptionFilter |
当异常发生的时候运行 |
首先，我们实现一个AuthFilterOutside可以用以简单的权限控制：
public class AuthFilterOutside: AuthorizeAttribute
{
private SP_PortUserBLL sp_portuserbll = new SP_PortUserBLL();
//重写基类的验证方式，加入我们自定义的Ticket验证
public override void OnAuthorization(HttpActionContext actionContext)
{
//url获取token
var content = actionContext.Request.Properties["MS_HttpContext"] as HttpContextBase;
HttpRequestBase request = content.Request;
string access_key = request.Form["access_key"];//获取请求参数对应的值
string sign = request.Form["sign"];
if (!string.IsNullOrEmpty(access_key) && !string.IsNullOrEmpty(sign))
{
//解密用户ticket,并校验用户名密码是否匹配
if (ValidateTicket(access_key, sign))
{
base.IsAuthorized(actionContext);
}
else
{
HandleUnauthorizedRequest(actionContext);
}
}
//如果取不到身份验证信息，并且不允许匿名访问，则返回未验证401
else
{
var attributes = actionContext.ActionDescriptor.GetCustomAttributes<AllowAnonymousAttribute>().OfType<AllowAnonymousAttribute>();
bool isAnonymous = attributes.Any(a => a is AllowAnonymousAttribute);
if (isAnonymous) base.OnAuthorization(actionContext);
else HandleUnauthorizedRequest(actionContext);
}
}
//校验sign（数据库数据匹配）
private bool ValidateTicket(string key,string sign)
{
var result=sp_portuserbll.GetAccess_secret(key);
if (!string.IsNullOrEmpty(result))
{
var mysing= Encryption.DataEncryption(key, result);//sign验证
if (mysing.Equals(sign))
{
return true;
}
return false;
}
return false;
}
}
当请求地址里面包含 access_key 和 sign 对应的键值对，获取对应的值与数据库数据进行匹配，匹配通过后可请求数据，适用于get 、post请求。
接口请求成功后记录日志的实现
/// <summary>
/// 请求成功后触发
/// </summary>
public class AuthFilter: ActionFilterAttribute
{
private PortLogBLL portlogbll = new PortLogBLL();
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
//action 请求之后触发
//日志记录 访问量记录等等
portlogbll.SaveForm(new PortLogEntity()
{
PortName = actionExecutedContext.Request.RequestUri.AbsolutePath,//获得调用接口,
RequestType = actionExecutedContext.Request.Method.ToString(),
StatusCode = Convert.ToInt32(new HttpResponseMessage(HttpStatusCode.OK).StatusCode),//设置状态码
ClientIp = GetClientIp(),
ParameterList = actionExecutedContext.ActionContext.ActionArguments.ToJson(),//获得参数值
Success = true
});
}
/// <summary>
/// 获取客户端Ip
/// </summary>
/// <returns></returns>
private string GetClientIp()
{
string result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (string.IsNullOrEmpty(result))
{
result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
if (string.IsNullOrEmpty(result))
{
result = HttpContext.Current.Request.UserHostAddress;
}
if (string.IsNullOrEmpty(result))
{
return "0.0.0.0";
}
return result;
}
}
当服务端代码报错或出异常时，可自定义设置固定格式的异常返回给调用者
/// <summary>
/// 接口发生异常过滤器
/// </summary>
public class ExceptionHandling : ExceptionFilterAttribute, IExceptionFilter
{
private PortLogBLL portlogbll = new PortLogBLL();
public override void OnException(HttpActionExecutedContext actionExecutedContext)
{
var code = new HttpResponseMessage(HttpStatusCode.InternalServerError).StatusCode;//设置错误代码：例如：500 404
actionExecutedContext.Response = new HttpResponseMessage(HttpStatusCode.InternalServerError);
string msg = JsonConvert.SerializeObject(new BaseResult() { success = false, message = actionExecutedContext.Exception.Message });//返回异常错误提示
//写入错误日志相关实现
portlogbll.SaveForm(new PortLogEntity()
{
PortName = actionExecutedContext.Request.RequestUri.AbsolutePath,
RequestType = actionExecutedContext.Request.Method.ToString(),
StatusCode = Convert.ToInt32(code),
ClientIp = GetClientIp(),
ParameterList = actionExecutedContext.ActionContext.ActionArguments.ToJson(),
Success = false,
ErrorMessage = msg
});
//result
actionExecutedContext.Response.Content = new StringContent(msg, Encoding.UTF8);
}
/// <summary>
/// 获取调用接口者ip地址
/// </summary>
/// <returns></returns>
private string GetClientIp()
{
string result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (string.IsNullOrEmpty(result))
{
result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
if (string.IsNullOrEmpty(result))
{
result = HttpContext.Current.Request.UserHostAddress;
}
if (string.IsNullOrEmpty(result))
{
return "0.0.0.0";
}
return result;
}
}
public class BaseResult
{
/// <summary>
/// 状态
/// </summary>
public bool success { get; set; }
/// <summary>
/// 错误信息
/// </summary>
public string message { get; set; }
}
以上是开发webapi常用代码，自己封装一下就可以使用了
标签：cep and 逻辑 public 开发 nts ken 用户名 并且
原文地址：https://www.cnblogs.com/jiangxifanzhouyudu/p/9093147.html
