refactor: split node agent and Go control plane

2026-09-11 16:57:31 +08:00
parent 078c22c73b
commit c86ba9c4d7
129 changed files with 654 additions and 77 deletions
@@ -0,0 +1,74 @@
+using System.Security.Cryptography;
+using System.Text;
+using ZstdSharp;
+
+namespace WxAgent.Core;
+
+/// <summary>Database-backed message with stable identity, sender and timestamps.</summary>
+public sealed record DbMessage(
+    long LocalId,
+    long ServerId,
+    string ChatId,
+    string? SenderWxId,
+    string? SenderName,
+    string? SenderAvatarUrl,
+    long Type,
+    string Content,
+    DateTimeOffset Timestamp,
+    bool? IsSelf);
+
+public static class WechatDbMessage
+{
+    // WeChat 4.x stores message_content as hex; rows with WCDB_CT_message_content=1 are zstd-compressed (magic 28 b5 2f fd).
+    public static string TableNameFor(string chatId) =>
+        "Msg_" + Convert.ToHexString(MD5.HashData(Encoding.UTF8.GetBytes(chatId))).ToLowerInvariant();
+
+    public static string DecodeContent(string hexContent, bool compressed)
+    {
+        if (string.IsNullOrEmpty(hexContent)) return string.Empty;
+        if (hexContent.Length > WechatMergedChatParser.MaxXmlCharacters * 2)
+            throw new InvalidDataException("Database message content exceeds the decoding limit.");
+        byte[] bytes;
+        try
+        {
+            bytes = Convert.FromHexString(hexContent);
+        }
+        catch (FormatException)
+        {
+            return string.Empty;
+        }
+
+        if (compressed && bytes.Length >= 4 && bytes[0] == 0x28 && bytes[1] == 0xb5 && bytes[2] == 0x2f && bytes[3] == 0xfd)
+        {
+            try
+            {
+                using var source = new MemoryStream(bytes);
+                using var decompressor = new DecompressionStream(source);
+                using var reader = new StreamReader(decompressor, Encoding.UTF8);
+                var decoded = new StringBuilder();
+                var buffer = new char[4096];
+                int read;
+                while ((read = reader.Read(buffer, 0, buffer.Length)) != 0)
+                {
+                    if (decoded.Length + read > WechatMergedChatParser.MaxXmlCharacters)
+                        throw new InvalidDataException("Decompressed message exceeds the decoding limit.");
+                    decoded.Append(buffer, 0, read);
+                }
+                return decoded.ToString();
+            }
+            catch (Exception exception) when (exception is not (OutOfMemoryException or InvalidDataException))
+            {
+                return string.Empty;
+            }
+        }
+
+        return compressed ? string.Empty : Encoding.UTF8.GetString(bytes);
+    }
+
+    /// <summary>The account root directory name is &lt;wxid&gt;_&lt;random&gt;; the reference project treats the wxid prefix as self.</summary>
+    public static bool? IsSelf(string? senderWxId, string? accountRootDirectoryName)
+    {
+        if (string.IsNullOrEmpty(senderWxId) || string.IsNullOrEmpty(accountRootDirectoryName)) return null;
+        return accountRootDirectoryName.StartsWith(senderWxId + "_", StringComparison.Ordinal);
+    }
+}