使用 Swashbuckle.AspNetCore 手动将自定义路由参数添加到 Swagger 文档

Question

所以我遇到了一个有趣的案例，我需要为 REST API 生成 swagger 文档，其唯一文档是实际文档（没有内联 XML 文档）和我没有直接来源代码访问。所以我简单地写了一个包装控制器，并像这样覆盖每个路由：

[HttpGet("this/{that}/the/{other}")]
public override IActionResult GetWhatever(String that, String other) => base.GetWhatever(that, other);

然后只是用标准摘要标签等对其进行记录。但是，现在被覆盖的方法之一在内部使用查询字符串，并且不作为 [FromQuery] 的参数公开，因此无法自动记录反思（并且在没有实际参数的情况下为其添加标签不会为其生成文档）

我需要一种手动添加此参数文档的方法，但是通过代码以某种方式（不仅仅是将其添加到 swagger.json 文件中）。我虽然可以使用 SwaggerGen 的 ISchemaFilter 向关联的路由/方法添加参数描述，但到目前为止我运气不佳。

有没有人有这样的例子？

Answer 1

看来我正在寻找的是 IOpertationFilter。将其与自定义属性相结合，我能够创建我需要的内容，以便动态地手动将自定义参数添加到 Swagger 文档中。请参阅下面的所有相关代码，请注意 Schema/PartialSchema 有很多属性，我只设置了我需要的类型，其他情况可能需要更多。

SwaggerParameterAttribute.cs

using System;
using Microsoft.AspNetCore.Mvc.Filters;
using Swashbuckle.AspNetCore.Swagger;

/// <summary>
/// Types of Swagger parameters
/// </summary>
  public enum SwaggerParamType {Body, NonBody};

/// <summary>
/// Attribute to facilitate manually adding a parameter to auto-generated Swagger documentation
/// </summary>
  [AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
  public class SwaggerParameterAttribute : ActionFilterAttribute {

  /// <summary>
  /// Swagger parameter to inject
  /// </summary>
    public IParameter Parameter { get; set; } 

  /// <summary>
  /// Default constructor
  /// </summary>
  /// <param name="ParamType">Type of Swagger parameter (Body/NonBody)</param>
  /// <param name="Name">Name of the parameter</param>
  /// <param name="Type">Primitive type associated with the parameter (int, bool, string, etc.)</param>
  /// <param name="In">Location of the parameter (path, query, etc.)</param>
  /// <param name="Description">Description of the parameter</param>
  /// <param name="Required">Whether the parameter is required or not (true/false)</param>
    public SwaggerParameterAttribute(SwaggerParamType ParamType, String Name, String Type, String In, String Description = "", Boolean Required = false){
  switch (ParamType) {      
    case SwaggerParamType.Body:
      Parameter = new BodyParameter() { Name = Name, In = In, Description = Description, Required = Required, Schema = new Schema() { Type = Type } };
      break;    
    case SwaggerParamType.NonBody:
      Parameter = new NonBodyParameter() { Name = Name, In = In, Description = Description, Required = Required };  
      ((PartialSchema)Parameter).Type = Type;
      break;
    default:
      throw new ArgumentOutOfRangeException("Invalid Swagger parameter type specified.");
  }
}

SwaggerOperationFilter.cs

using System;
using System.Reflection;
using Microsoft.AspNetCore.Mvc.Controllers;
using Swashbuckle.AspNetCore.Swagger;
using Swashbuckle.AspNetCore.SwaggerGen;

using Whatever.NameSpace.Your.Attribute.Is.In;

/// <summary>
/// Custom Swagger Operation Filter
/// </summary>
  public class SwaggerOperationFilter : IOperationFilter {
    public void Apply(Operation operation, OperationFilterContext context) {
    //Check for [SwaggerParameter] add defined parameter to the parameter list
      foreach (Attribute attribute in ((ControllerActionDescriptor)context.ControllerActionDescriptor).MethodInfo.GetCustomAttributes()) {
        if (attribute.GetType() == typeof(SwaggerParameterAttribute)) {
          operation.Parameters.Add(((SwaggerParameterAttribute)attribute).Parameter);
        }
      }
    }
  }

Startup.cs（只是swagger操作过滤器部分）

using Swashbuckle.AspNetCore.Swagger;

using Whatever.NameSpace.Your.Filter.Is.In;

public void ConfigureServices(IServiceCollection services) {
  services.AddSwaggerGen(options => {
    options.OperationFilter<SwaggerOperationFilter>();
  }
}

SomeController.cs（使用示例）

using Swashbuckle.AspNetCore.Swagger;
using Swashbuckle.AspNetCore.SwaggerGen;

using Whatever.NameSpace.Your.Attribute.Is.In;

[HttpGet("this/{that}/the/{other}")]
[SwaggerParameter(ParamType: SwaggerParamType.NonBody, Name: "param1", Type: "string", In: "query", Description: "Some description of param1 here")]
[SwaggerParameter(SwaggerParamType.NonBody, "param2", "string", "query", "Some description of param2 here")]
public override IActionResult GetWhatever(String that, String other) => base.GetWhatever(that, other);