part #2

src/Scanner/StellaOps.Scanner.Worker/Processing/NullEpssProvider.cs

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: BUSL-1.1
+// Copyright (c) StellaOps
+
+using StellaOps.Scanner.Core.Epss;
+
+namespace StellaOps.Scanner.Worker.Processing;
+
+/// <summary>
+/// Null implementation of IEpssProvider for when EPSS storage is not configured.
+/// </summary>
+internal sealed class NullEpssProvider : IEpssProvider
+{
+    public Task<EpssEvidence?> GetCurrentAsync(string cveId, CancellationToken cancellationToken = default)
+        => Task.FromResult<EpssEvidence?>(null);
+
+    public Task<EpssBatchResult> GetCurrentBatchAsync(IEnumerable<string> cveIds, CancellationToken cancellationToken = default)
+        => Task.FromResult(new EpssBatchResult { Found = [], NotFound = cveIds.ToList(), ModelDate = DateOnly.MinValue });
+
+    public Task<EpssEvidence?> GetAsOfDateAsync(string cveId, DateOnly asOfDate, CancellationToken cancellationToken = default)
+        => Task.FromResult<EpssEvidence?>(null);
+
+    public Task<IReadOnlyList<EpssEvidence>> GetHistoryAsync(string cveId, DateOnly startDate, DateOnly endDate, CancellationToken cancellationToken = default)
+        => Task.FromResult<IReadOnlyList<EpssEvidence>>([]);
+
+    public Task<DateOnly?> GetLatestModelDateAsync(CancellationToken cancellationToken = default)
+        => Task.FromResult<DateOnly?>(null);
+
+    public Task<bool> IsAvailableAsync(CancellationToken cancellationToken = default)
+        => Task.FromResult(false);
+}