Baseline: Ausgangszustand vor Modularisierung

Erster Commit des bestehenden monolithischen WinForms-Copytraders, inklusive der Alt-Backups (*.bak), damit diese dauerhaft in der Historie rekonstruierbar bleiben. Threema-Lib unter libs/ wurde vendored (nested .git entfernt). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-01 13:16:16 +02:00
commit 475d396f80
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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace IcgSoftware.Threema.CoreMsgApi
+{
+	/// <summary>
+	/// Stores and caches public keys for Threema users. Extend this class to provide your
+	/// own storage implementation, e.g. in a file or database.
+	/// </summary>
+	public abstract class PublicKeyStore
+	{
+		private readonly static object lockCache = new object();
+		private readonly Dictionary<string, byte[]> cache = new Dictionary<string, byte[]>();
+
+		/// <summary>
+		/// Get the public key for a given Threema ID. The cache is checked first; if it
+		/// is not found in the cache, fetchPublicKey() is called.
+		/// </summary>
+		/// <param name="threemaId">The Threema ID whose public key should be obtained</param>
+		/// <returns>The public key, or null if not found</returns>
+		public byte[] GetPublicKey(string threemaId)
+		{
+			lock (lockCache)
+			{
+				byte[] pk = null;
+
+				if (this.cache.Keys.Contains(threemaId))
+				{
+					pk = this.cache[threemaId];
+				}
+				else
+				{
+					pk = this.FetchPublicKey(threemaId);
+					if (pk != null)
+					{
+						this.cache.Add(threemaId, pk);
+					}
+				}
+
+				return pk;
+			}
+		}
+
+		/// <summary>
+		/// Store the public key for a given Threema ID in the cache, and the underlying store.
+		/// </summary>
+		/// <param name="threemaId">The Threema ID whose public key should be stored</param>
+		/// <param name="publicKey">The corresponding public key</param>
+		public void SetPublicKey(string threemaId, byte[] publicKey)
+		{
+			if(publicKey != null)
+			{
+				lock (lockCache)
+				{
+					this.cache.Add(threemaId, publicKey);
+					this.Save(threemaId, publicKey);
+				}
+			}
+		}
+
+		/// <summary>
+		/// Fetch the public key for the given Threema ID from the store. Override to provide
+		/// your own implementation to read from the store.
+		/// </summary>
+		/// <param name="threemaId">The Threema ID whose public key should be obtained</param>
+		/// <returns>The public key, or null if not found</returns>
+		abstract protected byte[] FetchPublicKey(string threemaId);
+
+		/// <summary>
+		/// Save the public key for a given Threema ID in the store. Override to provide
+		/// your own implementation to write to the store.
+		/// </summary>
+		/// <param name="threemaId">The Threema ID whose public key should be stored</param>
+		/// <param name="publicKey">The corresponding public key</param>
+		abstract protected void Save(string threemaId, byte[] publicKey);
+	}
+}