failing tests for rate limiter policy validation when 'default' or 'disable' used

src/ReverseProxy/Configuration/ConfigValidator.cs

@@ -302,20 +302,25 @@ private async ValueTask ValidateRateLimiterPolicyAsync(IList<Exception> errors,
             return;
         }
 
+        if (string.Equals(RateLimitingConstants.Default, rateLimiterPolicyName, StringComparison.OrdinalIgnoreCase)
+            || string.Equals(RateLimitingConstants.Disable, rateLimiterPolicyName, StringComparison.OrdinalIgnoreCase))
+        {
+            var policy = await _rateLimiterPolicyProvider.GetPolicyAsync(rateLimiterPolicyName);
+            if (policy is not null)
+            {
+                // We weren't expecting to find a policy with these names.
+                errors.Add(new ArgumentException($"The application has registered a RateLimiter policy named '{rateLimiterPolicyName}' that conflicts with the reserved RateLimiter policy name used on this route. The registered policy name needs to be changed for this route to function."));
+            }
+            return;
+        }
+
         try
         {
             var policy = await _rateLimiterPolicyProvider.GetPolicyAsync(rateLimiterPolicyName);
 
             if (policy is null)
             {
                 errors.Add(new ArgumentException($"RateLimiter policy '{rateLimiterPolicyName}' not found for route '{routeId}'."));
-                return;
-            }
-
-            if (string.Equals(RateLimitingConstants.Default, rateLimiterPolicyName, StringComparison.OrdinalIgnoreCase)
-                || string.Equals(RateLimitingConstants.Disable, rateLimiterPolicyName, StringComparison.OrdinalIgnoreCase))
-            {
-                errors.Add(new ArgumentException($"The application has registered a RateLimiter policy named '{rateLimiterPolicyName}' that conflicts with the reserved RateLimiter policy name used on this route. The registered policy name needs to be changed for this route to function."));
             }
         }
         catch (Exception ex)

test/ReverseProxy.Tests/Configuration/ConfigValidatorTests.cs

@@ -4,7 +4,13 @@
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+#if NET7_0_OR_GREATER
+using Microsoft.AspNetCore.Builder;
+#endif
 using Microsoft.AspNetCore.Cors.Infrastructure;
+#if NET7_0_OR_GREATER
+using Microsoft.AspNetCore.RateLimiting;
+#endif
 using Microsoft.Extensions.DependencyInjection;
 using Moq;
 using Xunit;
@@ -710,6 +716,81 @@ public async Task Rejects_ReservedCorsPolicyIsUsed(string corsPolicy)
         Assert.Contains(result, err => err.Message.Equals($"The application has registered a CORS policy named '{corsPolicy}' that conflicts with the reserved CORS policy name used on this route. The registered policy name needs to be changed for this route to function."));
     }
 
+#if NET7_0_OR_GREATER
+    [Theory]
+    [InlineData("Default")]
+    [InlineData("Disable")]
+    public async Task Accepts_BuiltInRateLimiterPolicy(string rateLimiterPolicy)
+    {
+        var route = new RouteConfig {
+            RouteId = "route1",
+            Match = new RouteMatch
+            {
+                Hosts = new[] { "localhost" },
+            },
+            ClusterId = "cluster1",
+            RateLimiterPolicy = rateLimiterPolicy
+        };
+
+        var services = CreateServices();
+        var validator = services.GetRequiredService<IConfigValidator>();
+
+        var result = await validator.ValidateRouteAsync(route);
+
+        Assert.Empty(result);
+    }
+
+    [Theory]
+    [InlineData("Default")]
+    [InlineData("Disable")]
+    public async Task Reports_BuildInRateLimiterPolicyNameConflict(string rateLimiterPolicy)
+    {
+        var route = new RouteConfig
+        {
+            RouteId = "route1",
+            Match = new RouteMatch
+            {
+                Hosts = new[] { "localhost" },
+            },
+            ClusterId = "cluster1",
+            RateLimiterPolicy = rateLimiterPolicy
+        };
+
+        var services = CreateServices(s =>
+        {
+            s.AddRateLimiter(o => o.AddConcurrencyLimiter(rateLimiterPolicy, c => { }));
+        });
+        var validator = services.GetRequiredService<IConfigValidator>();
+
+        var result = await validator.ValidateRouteAsync(route);
+
+        Assert.NotEmpty(result);
+        Assert.Contains(result, err => err.Message.Contains($"The application has registered a RateLimiter policy named '{rateLimiterPolicy}' that conflicts with the reserved RateLimiter policy name used on this route. The registered policy name needs to be changed for this route to function."));
+    }
+
+    [Theory]
+    [InlineData("NotAPolicy")]
+    public async Task Rejects_InvalidRateLimiterPolicy(string rateLimiterPolicy)
+    {
+        var route = new RouteConfig {
+            RouteId = "route1",
+            Match = new RouteMatch
+            {
+                Hosts = new[] { "localhost" },
+            },
+            ClusterId = "cluster1",
+            RateLimiterPolicy = rateLimiterPolicy };
+
+        var services = CreateServices();
+        var validator = services.GetRequiredService<IConfigValidator>();
+
+        var result = await validator.ValidateRouteAsync(route);
+
+        Assert.NotEmpty(result);
+        Assert.Contains(result, err => err.Message.Contains($"RateLimiter policy '{rateLimiterPolicy}' not found"));
+    }
+#endif
+
     [Fact]
     public async Task EmptyCluster_Works()
     {