Asp.Net Core WebAPI使用Swagger时API隐藏与分组

1、前言

为什么我们要隐藏部分接口？

因为我们在用swagger代替接口的时候，难免有些接口会直观的暴露出来，比如我们结合Consul一起使用的时候，会将健康检查接口以及报警通知接口暴露出来，这些接口有时候会出于方便考虑，没有进行加密，这个时候我们就需要把接口隐藏起来，只有内部的开发者知道。

为什么要分组？

通常当我们写前后端分离的项目的时候，难免会遇到编写很多接口供前端页面进行调用，当接口达到几百个的时候就需要区分哪些是框架接口，哪些是业务接口，这时候给swaggerUI的接口分组是个不错的选择。

swagger的基本使用这里将不再赘述，可以阅读微软官方文档，即可基本使用

2、swaggerUI中加入授权请求

• 新建 HttpHeaderOperationFilter 操作过滤器，继承 Swashbuckle.AspNetCore.SwaggerGen.IOperationFilter 接口，实现 Apply 方法

  /// <summary>
  /// swagger请求头
  /// </summary>
  public class HttpHeaderOperationFilter : IOperationFilter
  {
      public void Apply(Operation operation, OperationFilterContext context)
      {
          #region 新方法
          if (operation.Parameters == null)
          {
              operation.Parameters = new List<IParameter>();
          }
  
          if (context.ApiDescription.TryGetMethodInfo(out MethodInfo methodInfo))
          {
              if (!methodInfo.CustomAttributes.Any(t => t.AttributeType == typeof(AllowAnonymousAttribute))
                      &&!(methodInfo.ReflectedType.CustomAttributes.Any(t => t.AttributeType == typeof(AuthorizeAttribute))))
              {
                  operation.Parameters.Add(new NonBodyParameter
                  {
                      Name = "Authorization",
                      In = "header",
                      Type = "string",
                      Required = true,
                      Description = "请输入Token，格式为bearer XXX"
                  });
              }
          }
          #endregion
  
          #region 已过时
          //if (operation.Parameters == null)
          //{
          //    operation.Parameters = new List<IParameter>();
          //}
          //var actionAttrs = context.ApiDescription.ActionAttributes().ToList();
          //var isAuthorized = actionAttrs.Any(a => a.GetType() == typeof(AuthorizeAttribute));
          //if (isAuthorized == false)
          //{
          //    var controllerAttrs = context.ApiDescription.ControllerAttributes();
          //    isAuthorized = controllerAttrs.Any(a => a.GetType() == typeof(AuthorizeAttribute));
          //}
          //var isAllowAnonymous = actionAttrs.Any(a => a.GetType() == typeof(AllowAnonymousAttribute));
          //if (isAuthorized && isAllowAnonymous == false)
          //{
          //    operation.Parameters.Add(new NonBodyParameter
          //    {
          //        Name = "Authorization",
          //        In = "header",
          //        Type = "string",
          //        Required = true,
          //        Description = "请输入Token，格式为bearer XXX"
          //    });
          //}
          #endregion
      }
  }

• 然后修改 Startup.cs 中的 ConfigureServices 方法，添加我们自定义的 HttpHeaderOperationFilter 过滤器

  public IServiceProvider ConfigureServices(IServiceCollection services)
  {
      ...
      services.AddSwaggerGen(c =>
      {
          ...
          c.OperationFilter<HttpHeaderOperationFilter>();
      });
      ...
  }

  这时候我们再访问swaggerUI就可以输入Token了
  

3、API分组

• 修改 Startup.cs 中的 ConfigureServices 方法，添加多个swagger文档

  public IServiceProvider ConfigureServices(IServiceCollection services)
  {
      ...
      services.AddSwaggerGen(c =>
      {
          c.SwaggerDoc("v1", new Info
          {
              Version = "v1",
              Title = "接口文档",
              Description =  "接口文档-基础",
              TermsOfService = "",
              Contact = new Contact
              {
                  Name = "XXX1111",
                  Email = "XXX1111@qq.com",
                  Url = ""
              }
          });
  
          c.SwaggerDoc("v2", new Info
          {
              Version = "v2",
              Title = "接口文档",
              Description =  "接口文档-基础",
              TermsOfService = "",
              Contact = new Contact
              {
                  Name = "XXX2222",
                  Email = "XXX2222@qq.com",
                  Url = ""
              }
          });
  
          //反射注入全部程序集说明
          GetAllAssemblies().Where(t => t.CodeBase.EndsWith("Controller.dll")).ToList().ForEach(assembly =>
              {
                  c.IncludeXmlComments(assembly.CodeBase.Replace(".dll", ".xml"));
              });
  
          c.OperationFilter<HttpHeaderOperationFilter>();
          //c.DocumentFilter<HiddenApiFilter>();
      });
      ...
  }

• 修改 Startup.cs 中的 Configure 方法，加入

  public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)
  {
      ...
      app.UseSwagger();
      app.UseSwaggerUI(c =>
      {
          c.SwaggerEndpoint("/swagger/v2/swagger.json", "接口文档-基础");//业务接口文档首先显示
          c.SwaggerEndpoint("/swagger/v1/swagger.json", "接口文档-业务");//基础接口文档放后面后显示
          c.RoutePrefix = string.Empty;//设置后直接输入IP就可以进入接口文档
      });
      ...
  
  }

• 然后还要在我们的控制器上面标注swagger文档的版本
  

  这时候我们就可以将接口文档进行分组显示了
  

4、API隐藏

• 创建自定义隐藏特性 HiddenApiAttribute.cs

  /// <summary>
  /// 隐藏swagger接口特性标识
  /// </summary>
  [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class)]
  public class HiddenApiAttribute:System.Attribute
  {
  }

• 创建API隐藏过滤器 HiddenApiFilter 继承 Swashbuckle.AspNetCore.SwaggerGen.IDocumentFilter 接口，实现 Apply 方法

  /// <summary>
  /// 自定义Swagger隐藏过滤器
  /// </summary>
  public class HiddenApiFilter : IDocumentFilter
  {
      public void Apply(SwaggerDocument swaggerDoc, DocumentFilterContext context)
      {
          foreach (ApiDescription apiDescription in context.ApiDescriptions)
          {
              if (apiDescription.TryGetMethodInfo(out MethodInfo method))
              {
                  if (method.ReflectedType.CustomAttributes.Any(t=>t.AttributeType==typeof(HiddenApiAttribute))
                          || method.CustomAttributes.Any(t => t.AttributeType == typeof(HiddenApiAttribute)))
                  {
                      string key = "/" + apiDescription.RelativePath;
                      if (key.Contains("?"))
                      {
                          int idx = key.IndexOf("?", System.StringComparison.Ordinal);
                          key = key.Substring(, idx);
                      }
                      swaggerDoc.Paths.Remove(key);
                  }
              }
          }
      }
  }

• 在 Startup.cs 中使用 HiddenApiFilter 

  public IServiceProvider ConfigureServices(IServiceCollection services)
  {
      ...
      services.AddSwaggerGen(c =>
      {
          c.SwaggerDoc("v1", new Info
          {
              Version = "v1",
              Title = "接口文档",
              Description =  "接口文档-基础",
              TermsOfService = "",
              Contact = new Contact
              {
                  Name = "XXX1111",
                  Email = "XXX1111@qq.com",
                  Url = ""
              }
          });
  
          c.SwaggerDoc("v2", new Info
          {
              Version = "v2",
              Title = "接口文档",
              Description =  "接口文档-基础",
              TermsOfService = "",
              Contact = new Contact
              {
                  Name = "XXX2222",
                  Email = "XXX2222@qq.com",
                  Url = ""
              }
          });
  
          //反射注入全部程序集说明
          GetAllAssemblies().Where(t => t.CodeBase.EndsWith("Controller.dll")
              && !t.CodeBase.Contains("Common.Controller.dll")).ToList().ForEach(assembly =>
              {
                  c.IncludeXmlComments(assembly.CodeBase.Replace(".dll", ".xml"));
              });
  
          c.OperationFilter<HttpHeaderOperationFilter>();
          c.DocumentFilter<HiddenApiFilter>();
      });
      ...
  }

• 示例：
  我这里提供了Consul的心跳检车接口
  

  但是在接口文档中并没有显示出来