refactor: split node agent and Go control plane

tests/node-agent/check_contact_query.py

@@ -0,0 +1,45 @@
+"""Offline SQLite check for the production contact SQL; no WeChat database is read."""
+
+import re
+import sqlite3
+from pathlib import Path
+
+source = (
+  Path(__file__).resolve().parents[2] / "node-agent/WxAgent.Core/WechatContactQuery.cs"
+).read_text()
+match = re.search(r'public const string Sql = """\s*(.*?)\s*""";', source, re.S)
+assert match is not None
+sql = match.group(1)
+
+with sqlite3.connect(":memory:") as connection:
+  connection.execute(
+    "CREATE TABLE contact(username TEXT PRIMARY KEY, nick_name TEXT, remark TEXT, small_head_url TEXT)"
+  )
+  connection.executemany(
+    "INSERT INTO contact VALUES (?, ?, ?, NULL)",
+    [(f"wxid_{i:04}", "same display name", None) for i in range(501)]
+    + [("room@chatroom", "group", None), ("literal", "O'Brien_%", None)],
+  )
+
+  def query(limit=201, offset=0, contains=None, groups=None):
+    return connection.execute(
+      sql, {"limit": limit, "offset": offset, "contains": contains, "groups": groups}
+    ).fetchall()
+
+  first = query()
+  assert len(first) == 201
+  second = query(offset=200)
+  third = query(offset=400)
+  ids = [row[0] for row in first[:200] + second[:200] + third]
+  assert len(ids) == 503 and len(set(ids)) == 503 and ids == sorted(ids)
+  assert [row[0] for row in query(contains="_%")] == ["literal"]
+  assert query(contains="'; DROP TABLE contact;--") == []
+  assert [row[0] for row in query(groups=1)] == ["room@chatroom"]
+  assert len(query(limit=10000, groups=0)) == 502
+  assert len(query(limit=10000, contains="same display name")) == 501
+  assert query(offset=503) == []
+  assert connection.execute("SELECT count(*) FROM contact").fetchone()[0] == 503
+
+print(
+  "contact SQL: pagination, duplicate names, literal filtering and group filtering passed"
+)