Treyt.Yarp.ReverseProxy.Swagger 3.2.2

Getting Started

Configure Swagger and YARP for your project.

Update appsettings.json:

{
  "ReverseProxy": {
    "Clusters": {
      "App1Cluster": {
        "Destinations": {
          "Default": {
            "Address": "https://localhost:5101",
            "Swaggers": [ // <-- this block
              {
                "PrefixPath": "/proxy-app1",
                "Paths": [
                  "/swagger/v1/swagger.json"
                ]
              }
            ]
          }
        }
      }
    }
  }
}

Create (if doesn't exist) or update ConfigureSwaggerOptions.cs:

public void Configure(SwaggerGenOptions options)
{
    var filterDescriptors = new List<FilterDescriptor>();

    foreach (var cluster in _reverseProxyDocumentFilterConfig.Clusters)
    {
        options.SwaggerDoc(cluster.Key, new OpenApiInfo {Title = cluster.Key, Version = cluster.Key});
    }

    filterDescriptors.Add(new FilterDescriptor
    {
        Type = typeof(ReverseProxyDocumentFilter),
        Arguments = Array.Empty<object>()
    });

    options.DocumentFilterDescriptors = filterDescriptors;
}

Update Program.cs:

builder.Services.AddTransient<IConfigureOptions<SwaggerGenOptions>, ConfigureSwaggerOptions>();
builder.Services.AddSwaggerGen();

var configuration = builder.Configuration.GetSection("ReverseProxy");
builder.Services
    .AddReverseProxy()
    .LoadFromConfig(configuration)
    .AddSwagger(configuration); // <-- this line

app.UseSwaggerUI(options =>
{
    var config = app.Services.GetRequiredService<IOptionsMonitor<ReverseProxyDocumentFilterConfig>>().CurrentValue;
    foreach (var cluster in config.Clusters)
    {
        options.SwaggerEndpoint($"/swagger/{cluster.Key}/swagger.json", cluster.Key);
    }
});

After run you will get generated Swagger files by clusters:

Authentication and Authorization

Update appsettings.json:

{
  "ReverseProxy": {
    "Clusters": {
      "App1Cluster": {
        "Destinations": {
          "Default": {
            "Address": "https://localhost:5101",
            "AccessTokenClientName": "Identity", // <-- this line
            "Swaggers": [
              {
                "PrefixPath": "/proxy-app1",
                "Paths": [
                  "/swagger/v1/swagger.json"
                ]
              }
            ]
          }
        }
      }
    }
  }
}

Update Program.cs:

builder.Services.AddAccessTokenManagement(options =>
{
    var identityConfig = builder.Configuration.GetSection("Identity").Get<IdentityConfig>()!;
    
    options.Client.Clients.Add("Identity", new ClientCredentialsTokenRequest
    {
        Address = $"{identityConfig.Url}/connect/token",
        ClientId = identityConfig.ClientId,
        ClientSecret = identityConfig.ClientSecret
    });
});

Filtering of Paths

Update appsettings.json:

{
  "ReverseProxy": {
    "Clusters": {
      "App1Cluster": {
        "Destinations": {
          "Default": {
            "Address": "https://localhost:5101",
            "Swaggers": [
              {
                "PrefixPath": "/proxy-app1",
                "PathFilterRegexPattern": ".*", // <-- this line
                "Paths": [
                  "/swagger/v1/swagger.json"
                ]
              }
            ]
          }
        }
      }
    }
  }
}

Filtering of Published Paths

If you want to publish only some configured path in YARP, you can use the AddOnlyPublishedPaths option. (For using these options, you need to add Methods configuration in the Match block of the YARP configuration.) Update appsettings.json:

{
  "ReverseProxy": {
    "Clusters": {
      "App1Cluster": {
        "Destinations": {
          "Default": {
            "Address": "https://localhost:5101",
            "Swaggers": [
              {
                "PrefixPath": "/proxy-app1",
                "AddOnlyPublishedPaths": true, // <-- this line
                "Paths": [
                  "/swagger/v1/swagger.json"
                ]
              }
            ]
          }
        }
      }
    }
  }
}