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src/Excititor/StellaOps.Excititor.WebService/Program.Helpers.cs

@@ -199,6 +199,33 @@ public partial class Program
         return Math.Clamp(parsed, min, max);
     }
 
+    private static IReadOnlyList<string> NormalizePurls(string[]? purls)
+    {
+        if (purls is null || purls.Length == 0)
+        {
+            return Array.Empty<string>();
+        }
+
+        var seen = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+        var ordered = new List<string>(purls.Length);
+        foreach (var purl in purls)
+        {
+            var trimmed = purl?.Trim();
+            if (string.IsNullOrWhiteSpace(trimmed))
+            {
+                continue;
+            }
+
+            var normalized = trimmed.ToLowerInvariant();
+            if (seen.Add(normalized))
+            {
+                ordered.Add(normalized);
+            }
+        }
+
+        return ordered;
+    }
+
     private static VexObservationStatementResponse ToResponse(VexObservationStatementProjection projection)
     {
         var scope = projection.Scope;
@@ -234,4 +261,8 @@ public partial class Program
                     signature.Issuer,
                     signature.VerifiedAt));
     }
+
+    private sealed record CachedGraphOverlay(
+        IReadOnlyList<GraphOverlayItem> Items,
+        DateTimeOffset CachedAt);
 }