Restructure solution layout by module

src/Policy/StellaOps.Policy.Gateway/Infrastructure/GatewayForwardingContext.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Net.Http;
+using Microsoft.AspNetCore.Http;
+
+namespace StellaOps.Policy.Gateway.Infrastructure;
+
+internal sealed record GatewayForwardingContext(string Authorization, string? Dpop, string? Tenant)
+{
+    private static readonly string[] ForwardedHeaders =
+    {
+        "Authorization",
+        "DPoP",
+        "X-Stella-Tenant"
+    };
+
+    public void Apply(HttpRequestMessage request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        request.Headers.TryAddWithoutValidation(ForwardedHeaders[0], Authorization);
+
+        if (!string.IsNullOrWhiteSpace(Dpop))
+        {
+            request.Headers.TryAddWithoutValidation(ForwardedHeaders[1], Dpop);
+        }
+
+        if (!string.IsNullOrWhiteSpace(Tenant))
+        {
+            request.Headers.TryAddWithoutValidation(ForwardedHeaders[2], Tenant);
+        }
+    }
+
+    public static bool TryCreate(HttpContext context, out GatewayForwardingContext forwardingContext)
+    {
+        ArgumentNullException.ThrowIfNull(context);
+
+        var authorization = context.Request.Headers.Authorization.ToString();
+        if (string.IsNullOrWhiteSpace(authorization))
+        {
+            forwardingContext = null!;
+            return false;
+        }
+
+        var dpop = context.Request.Headers["DPoP"].ToString();
+        if (string.IsNullOrWhiteSpace(dpop))
+        {
+            dpop = null;
+        }
+
+        var tenant = context.Request.Headers["X-Stella-Tenant"].ToString();
+        if (string.IsNullOrWhiteSpace(tenant))
+        {
+            tenant = null;
+        }
+
+        forwardingContext = new GatewayForwardingContext(authorization.Trim(), dpop, tenant);
+        return true;
+    }
+}