fix: source synced conversations from session database

node-agent/WxAgent.Windows/WechatContactDbReader.cs

@@ -59,6 +59,40 @@ public static class WechatContactDbReader
         return WechatContactQuery.Page(contacts, limit, offset);
     }
 
+    public static async Task<IReadOnlyDictionary<string, string>> ReadDisplayNamesAsync(
+        AccountKeySet account, IReadOnlyList<string> usernames, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(account);
+        ArgumentNullException.ThrowIfNull(usernames);
+        var distinct = usernames.Where(username => !string.IsNullOrWhiteSpace(username))
+            .Distinct(StringComparer.Ordinal).ToArray();
+        if (distinct.Length == 0) return new Dictionary<string, string>(StringComparer.Ordinal);
+
+        var database = RequireContactDatabase(account);
+        var result = new Dictionary<string, string>(StringComparer.Ordinal);
+        var path = ContactDatabasePath(account);
+        foreach (var chunk in distinct.Chunk(400))
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            var placeholders = string.Join(", ", chunk.Select((_, index) => $"$p{index}"));
+            var parameters = chunk.Select((username, index) =>
+                new KeyValuePair<string, object?>($"$p{index}", username)).ToArray();
+            var rows = await SqlCipherDatabaseReader.QueryRowsAsync(path, database.EncKey,
+                $"SELECT username, nick_name, remark FROM contact WHERE username IN ({placeholders});",
+                parameters, cancellationToken).ConfigureAwait(false);
+            foreach (var row in rows)
+            {
+                var username = row.GetValueOrDefault("username") as string;
+                if (string.IsNullOrWhiteSpace(username)) continue;
+                var remark = row.GetValueOrDefault("remark") as string;
+                var nickname = row.GetValueOrDefault("nick_name") as string;
+                var displayName = !string.IsNullOrWhiteSpace(remark) ? remark : nickname;
+                if (!string.IsNullOrWhiteSpace(displayName)) result[username] = displayName;
+            }
+        }
+        return result;
+    }
+
     public static async Task<WechatGroupMemberPage> ReadGroupMembersPageAsync(AccountKeySet account, string group,
         int limit = 500, int offset = 0, CancellationToken cancellationToken = default)
     {