work

src/Policy/StellaOps.Policy.Engine/Endpoints/PathScopeSimulationEndpoint.cs

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+using System.Text;
+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.AspNetCore.Mvc;
+using StellaOps.Policy.Engine.Streaming;
+
+namespace StellaOps.Policy.Engine.Endpoints;
+
+public static class PathScopeSimulationEndpoint
+{
+    public static IEndpointRouteBuilder MapPathScopeSimulation(this IEndpointRouteBuilder routes)
+    {
+        routes.MapPost("/simulation/path-scope", HandleAsync)
+            .WithName("PolicyEngine.PathScopeSimulation")
+            .WithOpenApi();
+
+        return routes;
+    }
+
+    private static async Task<IResult> HandleAsync(
+        [FromBody] PathScopeSimulationRequest request,
+        PathScopeSimulationService service,
+        CancellationToken cancellationToken)
+    {
+        try
+        {
+            var stream = service.StreamAsync(request, cancellationToken);
+            var responseBuilder = new StringBuilder();
+
+            await foreach (var line in stream.ConfigureAwait(false))
+            {
+                responseBuilder.AppendLine(line);
+            }
+
+            return Results.Text(responseBuilder.ToString(), "application/x-ndjson", Encoding.UTF8);
+        }
+        catch (PathScopeSimulationException ex)
+        {
+            var errorLine = JsonSerializer.Serialize(ex.Error);
+            return Results.Text(errorLine + "\n", "application/x-ndjson", Encoding.UTF8, StatusCodes.Status400BadRequest);
+        }
+    }
+}