c# - 如何使用 aspnet ApiVersioning 在 Swashbuckle 中配置 MultipleApiVersions

Question

如何配置 swashbuckle 以使用 Aspnet API verisoning？ https://github.com/Microsoft/aspnet-api-versioning

在我的 Startup.cs 中，我有以下代码来初始化基于属性的路由、api 版本控制和 swagger。

var constraintResolver = new DefaultInlineConstraintResolver()
{
    ConstraintMap =
    {
        ["apiVersion"] = typeof( ApiVersionRouteConstraint )
    }
};
config.MapHttpAttributeRoutes(constraintResolver);
config.AddApiVersioning();

config.EnableSwagger(c =>
{
    c.MultipleApiVersions(
        (apiDesc, targetApiVersion) => ResolveVersionSupportByRouteConstraint(apiDesc, targetApiVersion),
        (vc) =>
        {
            vc.Version("v1", "Swashbuckle Dummy API V1");
            vc.Version("v2", "Swashbuckle Dummy API V2");
        });
}



public static bool ResolveVersionSupportByRouteConstraint(ApiDescription apiDesc, string targetApiVersion)
{
    var versionConstraint = (apiDesc.Route.Constraints.ContainsKey("apiVersion"))
        ? apiDesc.Route.Constraints["apiVersion"] as RegexRouteConstraint
        : null;

    return (versionConstraint == null)
        ? false
        : versionConstraint.Pattern.Split('|').Contains(targetApiVersion);
}

当 ResolveVersionSupportByRouteConstraint 方法触发时，路由模板包含文字 api 字符串“api/v{version}/users” 我的用户 Controller 装饰有 [ApiVersion("1.0")] 并且我定义了以下路由 [Route("api/v{version:apiVersion}/users")]。当我用 postman 点击 api/v1/users 时，调用有效，但我无法弄清楚如何使用 Swashbuckle/Swagger 使其工作。

我希望我的 swagger 文档看起来像 asp.net core api 样板的示例，除了我将 Owin 与 owin 启动类而不是 .net core 一起使用:https://github.com/ASP-NET-Core-Boilerplate/Templates/blob/master/MVC%206%20API.md

Answer 1

你可以找到例子here这就是我在启动自托管 owin 应用程序时的做法:

public void Configuration(IAppBuilder appBuilder)
    {
        HttpConfiguration config = new HttpConfiguration();
        //configure your app

        config.AddApiVersioning(o =>
        {
            o.ReportApiVersions = true;
            o.ApiVersionReader = new UrlSegmentApiVersionReader();
        });
        var constraintResolver = new DefaultInlineConstraintResolver()
        {
            ConstraintMap = { ["apiVersion"] = typeof(ApiVersionRouteConstraint) }
        };
        config.MapHttpAttributeRoutes(constraintResolver);
        SwaggerConfiguration.Configure(config);            
        appBuilder.UseWebApi(config);
    }

swagger 的配置非常简单，主要部分在这里 VersionedApiExplorer(确保您传递了正确的 api groupnameformat，我的格式是 v1、v2 等):

public static class SwaggerConfiguration
{       
    public static void Configure(HttpConfiguration config)
    {
        var apiExplorer = config.AddVersionedApiExplorer(o => o.GroupNameFormat = "'v'V");
        config.EnableSwagger(
                swagger =>
                {
                    swagger.MultipleApiVersions(
                        (apiDesc, targetApiVersion) => apiDesc.GetGroupName() == targetApiVersion,
                        versionBuilder =>
                        {
                            foreach (var group in apiExplorer.ApiDescriptions)
                            {
                                var description = "";
                                if (group.IsDeprecated) description += "This API deprecated";

                                versionBuilder.Version(group.Name, $"Service API {group.ApiVersion}")
                                    .Description(description);
                            }
                        });
                    swagger.DocumentFilter<VersionFilter>();
                    swagger.OperationFilter<VersionOperationFilter>();
                })
            .EnableSwaggerUi(cfg => cfg.EnableDiscoveryUrlSelector());
    }

在 Controller 中添加属性 ApiVersion 和 RoutePrefix

[ApiVersion("1")]
[RoutePrefix("api/v{version:apiVersion}/history")]
public class HistoryController: ApiController

如果您对 VersionFilter 和 VersionOperationFilter 感到困惑，这里有对应的代码。此过滤器会 Swagger 修改生成的路由和参数(否则您的路由将看起来像/v{version}/{actionName} 并包含所需的参数版本)

public class VersionFilter : IDocumentFilter
{
    public void Apply(SwaggerDocument swaggerDoc, SchemaRegistry schemaRegistry, IApiExplorer apiExplorer)
    {
        swaggerDoc.paths = swaggerDoc.paths
            .ToDictionary(
                path => path.Key.Replace("v{version}", swaggerDoc.info.version),
                path => path.Value
            );
    }
}
public class VersionOperationFilter : IOperationFilter
{
    public void Apply(Operation operation, SchemaRegistry schemaRegistry, ApiDescription apiDescription)
    {
        var version = operation.parameters?.FirstOrDefault(p => p.name == "version");
        if (version != null)
        {
            operation.parameters.Remove(version);
        }
    }
}