feat: database-backed message model with multi-account key cache

- Add Windows 4.1.x Config.Cipher pointer-chain key extraction with cross-chunk MemoryPatternScanner and bounded blob XOR decoding; keys still require per-DB page-1 HMAC verification before caching. - Cache keys by account fingerprint + database relative path; db scan --save skips memory scanning entirely once all discovered databases are cached. - Add DbMessage model (localId, serverId, type, timestamp, sender, display name, avatar, isSelf) read read-only from Msg_{md5(chat)} via SQLCipher with hex/zstd content decoding and contact.db name resolution. - CLI: db messages / db contacts / db schema with masked defaults; include the earlier chat send --session wiring. 97 Core tests pass; real-machine validated.
2026-09-06 14:35:19 +08:00
parent 1494094651
commit fb8c25c83c
19 changed files with 1335 additions and 79 deletions
@@ -0,0 +1,48 @@
+using WxAgent.Core;
+using Xunit;
+
+namespace WxAgent.Core.Tests;
+
+public sealed class KeyCachePlannerTests
+{
+    private static AccountKeySet CachedAccount(string fingerprint, params string[] paths) => new(
+        fingerprint, "C:\\xwechat_files\\" + fingerprint, "4.1.13.63", DateTimeOffset.UtcNow,
+        paths.Select(path => new DatabaseKeyEvidence(path, "salt", "key", 42, DateTimeOffset.UtcNow, KeyBindingConfidence.PageHmacVerified)).ToArray());
+
+    private static AccountDatabaseEntry Entry(string fingerprint, string path) => new(fingerprint, path);
+
+    [Fact]
+    public void VerifiedKeysCoversEveryCachedDatabasePath()
+    {
+        var cached = new[] { CachedAccount("a", "contact.db", "message_0.db"), CachedAccount("b", "message_0.db") };
+        var verified = KeyCachePlanner.VerifiedKeys(cached);
+        Assert.Contains(KeyCachePlanner.Key("a", "contact.db"), verified);
+        Assert.Contains(KeyCachePlanner.Key("a", "message_0.db"), verified);
+        Assert.Contains(KeyCachePlanner.Key("b", "message_0.db"), verified);
+    }
+
+    [Fact]
+    public void HasPendingIsFalseWhenAllDiscoveredDatabasesAreCached()
+    {
+        var cached = new[] { CachedAccount("a", "contact.db", "message_0.db") };
+        var verified = KeyCachePlanner.VerifiedKeys(cached);
+        var discovered = new[] { Entry("a", "contact.db"), Entry("a", "message_0.db") };
+        Assert.False(KeyCachePlanner.HasPending(discovered, verified));
+    }
+
+    [Fact]
+    public void HasPendingIsTrueForNewDatabaseOrNewAccount()
+    {
+        var cached = new[] { CachedAccount("a", "contact.db") };
+        var verified = KeyCachePlanner.VerifiedKeys(cached);
+        Assert.True(KeyCachePlanner.HasPending([Entry("a", "message_0.db")], verified));
+        Assert.True(KeyCachePlanner.HasPending([Entry("b", "contact.db")], verified));
+    }
+
+    [Fact]
+    public void CacheKeyIsCaseInsensitiveForWindowsPaths()
+    {
+        var verified = KeyCachePlanner.VerifiedKeys([CachedAccount("a", "Contact.DB")]);
+        Assert.True(verified.Contains(KeyCachePlanner.Key("a", "contact.db")));
+    }
+}