重构：模块化 RRPP Lite 并更新入口

lite/others/update_pac_ip_cn/update_pac_ip_cn.py

@@ -0,0 +1,86 @@
+# -*- coding: utf-8 -*-
+"""更新 pac_ip_cn.json：从 17mon/china_ip_list 拉取中国 IPv4 段，写入带
+version/date 戳的本地 PAC 数据文件（客户端按 pac_manifest.json 比对在线更新）。
+
+用法:
+    python update_pac_ip_cn.py            # 拉取并更新（先自动备份）
+    python update_pac_ip_cn.py --dry-run  # 只统计，不写文件
+"""
+import argparse
+import ipaddress
+import json
+import sys
+import urllib.request
+from datetime import datetime
+from pathlib import Path
+
+SRC_URL = "https://raw.githubusercontent.com/17mon/china_ip_list/master/china_ip_list.txt"
+
+SCRIPT_DIR = Path(__file__).resolve().parent
+LITE_DIR = SCRIPT_DIR.parent.parent
+PAC_FILE = LITE_DIR / "pac_ip_cn.json"
+BACKUP_DIR = LITE_DIR / "backups"
+
+
+def fetch_lines(tries=2):
+    for i in range(tries):
+        try:
+            with urllib.request.urlopen(SRC_URL, timeout=20) as r:
+                return r.read().decode("utf-8", "replace").splitlines()
+        except Exception:
+            if i == tries - 1:
+                raise
+
+
+def main():
+    parser = argparse.ArgumentParser(description="更新 pac_ip_cn.json")
+    parser.add_argument("--dry-run", action="store_true", help="只统计，不写文件")
+    args = parser.parse_args()
+
+    print(f"拉取: {SRC_URL}")
+    cidrs, skipped = [], 0
+    for line in fetch_lines():
+        s = line.strip()
+        if not s or s.startswith("#"):
+            continue
+        try:
+            net = ipaddress.ip_network(s, strict=False)
+            if net.version == 4:
+                cidrs.append(str(net))
+            else:
+                skipped += 1
+        except ValueError:
+            skipped += 1
+    cidrs.sort(key=lambda c: (int(ipaddress.ip_network(c, strict=False).network_address),
+                              ipaddress.ip_network(c, strict=False).prefixlen))
+    print(f"共 {len(cidrs)} 条 IPv4 CIDR，跳过 {skipped} 条")
+
+    if args.dry_run:
+        print("--dry-run: 未写文件")
+        return
+
+    now = datetime.now()
+    comment = (
+        f"中国 IPv4 地址段（CIDR）。智能分流依据：解析 IP 命中列表 → 直连，"
+        f"未命中 → 走加密隧道。由 others/update_pac_ip_cn/update_pac_ip_cn.py "
+        f"从 17mon/china_ip_list 生成于 {now.strftime('%Y-%m-%d %H:%M')}；"
+        f"客户端按文件内 version/date 从 CDN 在线更新到 %LOCALAPPDATA%\\RRPP。"
+    )
+    out = {"_comment": comment,
+           "version": now.strftime("%Y%m%d%H%M"),
+           "date": now.strftime("%Y-%m-%d"),
+           "cidrs": cidrs}
+
+    BACKUP_DIR.mkdir(exist_ok=True)
+    bak = BACKUP_DIR / f"pac_ip_cn.json.bak_{now.strftime('%Y%m%d_%H%M%S')}"
+    if PAC_FILE.is_file():
+        bak.write_bytes(PAC_FILE.read_bytes())
+        print(f"已备份: {bak}")
+
+    PAC_FILE.write_text(json.dumps(out, ensure_ascii=False, indent=1) + "\n", "utf-8")
+    size = PAC_FILE.stat().st_size / 1024
+    print(f"已写入: {PAC_FILE}（{len(cidrs)} 条，{size:.0f} KB）")
+
+
+if __name__ == "__main__":
+    main()