refactor: split node agent and Go control plane

node-agent/WxAgent.Windows/WechatDatabaseDiscovery.cs

@@ -0,0 +1,58 @@
+using WxAgent.Core;
+
+namespace WxAgent.Windows;
+
+public sealed record AccountDatabaseFile(string FullPath, string RelativePath, byte[] FirstPage, string Salt);
+
+public sealed record AccountDatabaseRoot(string AccountRootPath, string Fingerprint, IReadOnlyList<AccountDatabaseFile> Databases);
+
+public static class WechatDatabaseDiscovery
+{
+    public static IReadOnlyList<AccountDatabaseRoot> FindAccountRoots(
+        string? xwechatFilesRoot = null,
+        CancellationToken cancellationToken = default)
+    {
+        cancellationToken.ThrowIfCancellationRequested();
+        var root = xwechatFilesRoot ?? Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "xwechat_files");
+        if (!Directory.Exists(root))
+        {
+            return [];
+        }
+
+        var accounts = new List<AccountDatabaseRoot>();
+        foreach (var accountDirectory in Directory.EnumerateDirectories(root))
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            var dbStorage = Path.Combine(accountDirectory, "db_storage");
+            if (!Directory.Exists(dbStorage))
+            {
+                continue;
+            }
+
+            var databases = new List<AccountDatabaseFile>();
+            foreach (var path in Directory.EnumerateFiles(dbStorage, "*.db", SearchOption.AllDirectories))
+            {
+                cancellationToken.ThrowIfCancellationRequested();
+                try
+                {
+                    var page = new byte[SqlCipherPageVerifier.PageSize];
+                    using var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete);
+                    stream.ReadExactly(page);
+
+                    var relativePath = Path.GetRelativePath(dbStorage, path).Replace('\\', '/');
+                    databases.Add(new AccountDatabaseFile(path, relativePath, page, Convert.ToHexString(page.AsSpan(0, SqlCipherPageVerifier.SaltSize)).ToLowerInvariant()));
+                }
+                catch (IOException)
+                {
+                }
+                catch (UnauthorizedAccessException)
+                {
+                }
+            }
+
+            accounts.Add(new AccountDatabaseRoot(dbStorage, AccountRootFingerprint.Create(dbStorage), databases));
+        }
+
+        return accounts;
+    }
+}