Refactor code structure for improved readability and maintainability; optimize performance in key functions.

src/Concelier/__Libraries/StellaOps.Concelier.Connector.Epss/Configuration/EpssOptions.cs

@@ -0,0 +1,59 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace StellaOps.Concelier.Connector.Epss.Configuration;
+
+public sealed class EpssOptions
+{
+    public const string SectionName = "Concelier:Epss";
+    public const string HttpClientName = "source.epss";
+
+    public Uri BaseUri { get; set; } = new("https://epss.empiricalsecurity.com/", UriKind.Absolute);
+
+    public bool FetchCurrent { get; set; } = true;
+
+    public int CatchUpDays { get; set; } = 7;
+
+    public TimeSpan HttpTimeout { get; set; } = TimeSpan.FromMinutes(2);
+
+    public int MaxRetries { get; set; } = 3;
+
+    public bool AirgapMode { get; set; }
+
+    public string? BundlePath { get; set; }
+
+    public string UserAgent { get; set; } = "StellaOps.Concelier.Epss/1.0";
+
+    [MemberNotNull(nameof(BaseUri), nameof(UserAgent))]
+    public void Validate()
+    {
+        if (BaseUri is null || !BaseUri.IsAbsoluteUri)
+        {
+            throw new InvalidOperationException("BaseUri must be an absolute URI.");
+        }
+
+        if (CatchUpDays < 0)
+        {
+            throw new InvalidOperationException("CatchUpDays cannot be negative.");
+        }
+
+        if (HttpTimeout <= TimeSpan.Zero)
+        {
+            throw new InvalidOperationException("HttpTimeout must be greater than zero.");
+        }
+
+        if (MaxRetries < 0)
+        {
+            throw new InvalidOperationException("MaxRetries cannot be negative.");
+        }
+
+        if (string.IsNullOrWhiteSpace(UserAgent))
+        {
+            throw new InvalidOperationException("UserAgent must be provided.");
+        }
+
+        if (AirgapMode && string.IsNullOrWhiteSpace(BundlePath))
+        {
+            throw new InvalidOperationException("BundlePath must be provided when AirgapMode is enabled.");
+        }
+    }
+}