RDAPでドメインの有効期限台帳を作る — Claude Codeで更新対象を洗い出す

#!/usr/bin/env python3
"""domains.txt の各ドメインを RDAP で引き、expiration の日付を CSV にする。"""
import csv, json, sys, time, urllib.request, urllib.error
from datetime import datetime, timezone
 
BOOTSTRAP = "https://data.iana.org/rdap/dns.json"
LIMIT_DAYS = 60
 
def load_bootstrap():
    with urllib.request.urlopen(BOOTSTRAP, timeout=30) as r:
        services = json.load(r)["services"]
    return {t: urls for tlds, urls in services for t in tlds}
 
def base_url(table, domain):
    labels = domain.lower().rstrip(".").split(".")
    for i in range(len(labels)):  # ラベル単位の最長一致
        urls = table.get(".".join(labels[i:]))
        if urls:
            return next((u for u in urls if u.startswith("https://")), urls[0])
    return None
 
def registrar_name(data):
    for ent in data.get("entities", []):
        if "registrar" in ent.get("roles", []):
            for item in ent.get("vcardArray", [None, []])[1]:
                if item[0] == "fn":
                    return item[3]
    return ""
 
def lookup(domain, table):
    row = {"domain": domain, "expiration": "", "status": "",
           "registrar": "", "note": ""}
    base = base_url(table, domain)
    if not base:
        row["note"] = "bootstrap に該当 TLD なし"
        return row
    req = urllib.request.Request(
        base.rstrip("/") + "/domain/" + domain,
        headers={"Accept": "application/rdap+json",
                 "User-Agent": "domain-ledger/1.0"})
    try:
        with urllib.request.urlopen(req, timeout=30) as r:
            data = json.load(r)
    except urllib.error.HTTPError as e:
        row["note"] = f"HTTP {e.code}"
        return row
    except Exception as e:
        row["note"] = f"取得失敗: {type(e).__name__}"
        return row
    row["status"] = ";".join(data.get("status", []))
    for ev in data.get("events", []):
        if ev.get("eventAction") == "expiration":
            row["expiration"] = ev["eventDate"]
    row["registrar"] = registrar_name(data)
    if not row["expiration"]:
        row["note"] = "expiration イベントなし"
    return row
 
def main(path):
    table = load_bootstrap()
    now = datetime.now(timezone.utc)
    rows = []
    for line in open(path, encoding="utf-8"):
        domain = line.strip()
        if not domain or domain.startswith("#"):
            continue
        row = lookup(domain, table)
        if row["expiration"]:
            exp = datetime.fromisoformat(row["expiration"].replace("Z", "+00:00"))
            row["days_left"] = (exp - now).days
            if row["days_left"] <= LIMIT_DAYS:
                row["note"] = "要更新"
        else:
            row["days_left"] = ""
        rows.append(row)
        time.sleep(1)  # 相手のサーバーへの負荷を抑える
    rows.sort(key=lambda r: (r["days_left"] == "", r["days_left"] or 0))
    w = csv.DictWriter(sys.stdout, ["domain", "expiration", "days_left",
                                    "registrar", "status", "note"])
    w.writeheader()
    w.writerows(rows)
 
if __name__ == "__main__":
    main(sys.argv[1])

domain,expiration,days_left,registrar,status,note
example.com,2027-08-13T04:00:00Z,297,RESERVED-Internet Assigned Numbers Authority,client delete prohibited;...,
example.net,2027-08-30T04:00:00Z,314,RESERVED-Internet Assigned Numbers Authority,client delete prohibited;...,
example.org,2027-08-30T04:00:00Z,314,ICANN,server delete prohibited;...,
example.jp,,,,,bootstrap に該当 TLD なし
nonexistent-zzq81.com,,,,,HTTP 404

{
  "permissions": {
    "allow": [
      "Bash(python3 rdap_expiry.py *)"
    ]
  }
}

# ドメイン台帳
- 台帳の更新は `python3 rdap_expiry.py domains.txt > ledger.csv` で行う
- 期限日は RDAP の expiration の値だけを使い、推測で補わない
- note が空でない行は、理由ごとに分けて報告する
- domains.txt を書き換えるときは、追加・削除したドメインを先に示す

0 9 * * 1 cd /path/to/ledger && python3 rdap_expiry.py domains.txt > ledger.csv