UP

src/StellaOps.Feedser.Source.Distro.Debian/Internal/DebianFetchCacheEntry.cs

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+using System;
+using MongoDB.Bson;
+
+namespace StellaOps.Feedser.Source.Distro.Debian.Internal;
+
+internal sealed record DebianFetchCacheEntry(string? ETag, DateTimeOffset? LastModified)
+{
+    public static DebianFetchCacheEntry Empty { get; } = new(null, null);
+
+    public static DebianFetchCacheEntry FromDocument(StellaOps.Feedser.Storage.Mongo.Documents.DocumentRecord document)
+        => new(document.Etag, document.LastModified);
+
+    public static DebianFetchCacheEntry FromBson(BsonDocument document)
+    {
+        if (document is null || document.ElementCount == 0)
+        {
+            return Empty;
+        }
+
+        string? etag = null;
+        DateTimeOffset? lastModified = null;
+
+        if (document.TryGetValue("etag", out var etagValue) && etagValue.BsonType == BsonType.String)
+        {
+            etag = etagValue.AsString;
+        }
+
+        if (document.TryGetValue("lastModified", out var modifiedValue))
+        {
+            lastModified = modifiedValue.BsonType switch
+            {
+                BsonType.String when DateTimeOffset.TryParse(modifiedValue.AsString, out var parsed) => parsed.ToUniversalTime(),
+                BsonType.DateTime => DateTime.SpecifyKind(modifiedValue.ToUniversalTime(), DateTimeKind.Utc),
+                _ => null,
+            };
+        }
+
+        return new DebianFetchCacheEntry(etag, lastModified);
+    }
+
+    public BsonDocument ToBsonDocument()
+    {
+        var document = new BsonDocument();
+        if (!string.IsNullOrWhiteSpace(ETag))
+        {
+            document["etag"] = ETag;
+        }
+
+        if (LastModified.HasValue)
+        {
+            document["lastModified"] = LastModified.Value.UtcDateTime;
+        }
+
+        return document;
+    }
+
+    public bool Matches(StellaOps.Feedser.Storage.Mongo.Documents.DocumentRecord document)
+    {
+        if (document is null)
+        {
+            return false;
+        }
+
+        if (!string.Equals(document.Etag, ETag, StringComparison.Ordinal))
+        {
+            return false;
+        }
+
+        if (LastModified.HasValue && document.LastModified.HasValue)
+        {
+            return LastModified.Value.UtcDateTime == document.LastModified.Value.UtcDateTime;
+        }
+
+        return !LastModified.HasValue && !document.LastModified.HasValue;
+    }
+}