Merge pull request #2173 from captainsafia/safia/op-id-from-group-name

Support setting operation IDs from EndpointName metadata

Author: domaindrivendev

src/Swashbuckle.AspNetCore.SwaggerGen/SwaggerGenerator/SwaggerGeneratorOptions.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using Microsoft.AspNetCore.Mvc.ApiExplorer;
 using Microsoft.OpenApi.Models;
+using Microsoft.AspNetCore.Routing;
 
 namespace Swashbuckle.AspNetCore.SwaggerGen
 {
@@ -61,7 +62,19 @@ private bool DefaultDocInclusionPredicate(string documentName, ApiDescription ap
 
         private string DefaultOperationIdSelector(ApiDescription apiDescription)
         {
-            return apiDescription.ActionDescriptor.AttributeRouteInfo?.Name;
+            var actionDescriptor = apiDescription.ActionDescriptor;
+
+            // Resolve the operation ID from the route name and fallback to the
+            // endpoint name if no route name is available. This allows us to
+            // generate operation IDs for endpoints that are defined using
+            // minimal APIs.
+#if (!NETSTANDARD2_0)
+            return
+                actionDescriptor.AttributeRouteInfo?.Name
+                ?? (actionDescriptor.EndpointMetadata.FirstOrDefault(m => m is IEndpointNameMetadata) as IEndpointNameMetadata)?.EndpointName;
+#else
+            return actionDescriptor.AttributeRouteInfo?.Name;
+#endif
         }
 
         private IList<string> DefaultTagsSelector(ApiDescription apiDescription)

test/Swashbuckle.AspNetCore.SwaggerGen.Test/SwaggerGenerator/SwaggerGeneratorTests.cs

@@ -1,9 +1,12 @@
 using System.Linq;
 using System.Collections.Generic;
+using System.Reflection;
 using System.Text.Json;
 using Microsoft.AspNetCore.Mvc.ApiExplorer;
+using Microsoft.AspNetCore.Mvc.Abstractions;
 using Microsoft.OpenApi.Models;
 using Microsoft.AspNetCore.Mvc.ModelBinding;
+using Microsoft.AspNetCore.Routing;
 using Microsoft.OpenApi.Any;
 using Xunit;
 using Swashbuckle.AspNetCore.Swagger;
@@ -77,6 +80,31 @@ public void GetSwagger_SetsOperationIdToRouteName_IfActionHasRouteNameMetadata()
             Assert.Equal("SomeRouteName", document.Paths["/resource"].Operations[OperationType.Post].OperationId);
         }
 
+        [Fact]
+        public void GetSwagger_SetsOperationIdToEndpointName_IfActionHasEndpointNameMetadata()
+        {
+            var methodInfo = typeof(FakeController).GetMethod(nameof(FakeController.ActionWithParameter));
+            var actionDescriptor = new ActionDescriptor
+            {
+                EndpointMetadata = new List<object>() { new EndpointNameMetadata("SomeEndpointName") },
+                RouteValues = new Dictionary<string, string>
+                {
+                    ["controller"] = methodInfo.DeclaringType.Name.Replace("Controller", string.Empty)
+                }
+            };
+            var subject = Subject(
+                apiDescriptions: new[]
+                {
+                    ApiDescriptionFactory.Create(actionDescriptor, methodInfo, groupName: "v1", httpMethod: "POST", relativePath: "resource"),
+                }
+            );
+
+            var document = subject.GetSwagger("v1");
+
+            Assert.Equal("SomeEndpointName", document.Paths["/resource"].Operations[OperationType.Post].OperationId);     
+        }
+
+
         [Fact]
         public void GetSwagger_SetsDeprecated_IfActionHasObsoleteAttribute()
         {

test/Swashbuckle.AspNetCore.TestSupport/ApiExplorer/ApiDescriptionFactory.cs

@@ -12,6 +12,7 @@ namespace Swashbuckle.AspNetCore.TestSupport
     public static class ApiDescriptionFactory
     {
         public static ApiDescription Create(
+            ActionDescriptor actionDescriptor,
             MethodInfo methodInfo,
             string groupName = "v1",
             string httpMethod = "POST",
@@ -20,8 +21,6 @@ public static ApiDescription Create(
             IEnumerable<ApiRequestFormat> supportedRequestFormats = null,
             IEnumerable<ApiResponseType> supportedResponseTypes = null)
         {
-            var actionDescriptor = CreateActionDescriptor(methodInfo);
-
             var apiDescription = new ApiDescription
             {
                 ActionDescriptor = actionDescriptor,
@@ -74,6 +73,30 @@ public static ApiDescription Create(
             return apiDescription;
         }
 
+        public static ApiDescription Create(
+            MethodInfo methodInfo,
+            string groupName = "v1",
+            string httpMethod = "POST",
+            string relativePath = "resoure",
+            IEnumerable<ApiParameterDescription> parameterDescriptions = null,
+            IEnumerable<ApiRequestFormat> supportedRequestFormats = null,
+            IEnumerable<ApiResponseType> supportedResponseTypes = null)
+        {
+
+            var actionDescriptor = CreateActionDescriptor(methodInfo);
+
+            return Create(
+                actionDescriptor,
+                methodInfo,
+                groupName,
+                httpMethod,
+                relativePath,
+                parameterDescriptions,
+                supportedRequestFormats,
+                supportedResponseTypes
+            );
+        }
+
         public static ApiDescription Create<TController>(
             Func<TController, string> actionNameSelector,
             string groupName = "v1",