import json, os, sys, ssl, urllib.request, urllib.error

LISTS = {
    "drop": "https://www.spamhaus.org/drop/drop_v4.json",
    "dropv6": "https://www.spamhaus.org/drop/drop_v6.json",
    "asndrop": "https://www.spamhaus.org/drop/asndrop.json",
}


def _cfg():
    return json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))


def _inputs():
    return json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))


def _ctx(cfg):
    if cfg.get("insecure"):
        c = ssl.create_default_context()
        c.check_hostname = False
        c.verify_mode = ssl.CERT_NONE
        return c
    return None


def _get(url, cfg):
    req = urllib.request.Request(
        url, headers={"User-Agent": "Riposte-SOAR", "Accept": "application/json"}
    )
    with urllib.request.urlopen(req, timeout=120, context=_ctx(cfg)) as r:
        return r.read()


def _run(fn):
    try:
        print(json.dumps(fn(_cfg(), _inputs())))
    except urllib.error.HTTPError as e:
        print(json.dumps({"error": "HTTP " + str(e.code), "detail": e.read().decode("utf-8", "replace")}))
        sys.exit(1)
    except Exception as e:
        print(json.dumps({"error": str(e)}))
        sys.exit(1)


def _parse(raw, maxn):
    # Spamhaus DROP lists are newline-delimited JSON objects. Metadata lines
    # (type == "metadata") are skipped. A legacy "cidr ; SBLxxx" text form is
    # also tolerated as a fallback.
    out = []
    for line in raw.splitlines():
        line = line.strip()
        if not line:
            continue
        try:
            obj = json.loads(line)
        except ValueError:
            part = line.split(";")[0].strip()
            if part and not part.startswith("#"):
                out.append({"value": part, "type": "cidr"})
            if maxn and len(out) >= maxn:
                break
            continue
        if not isinstance(obj, dict):
            continue
        if obj.get("type") == "metadata":
            continue
        cidr = obj.get("cidr")
        asn = obj.get("asn")
        if cidr:
            out.append({"value": cidr, "type": "cidr", "sblid": obj.get("sblid"), "rir": obj.get("rir")})
        elif asn is not None:
            out.append({"value": "AS" + str(asn), "type": "asn", "org": obj.get("org")})
        else:
            continue
        if maxn and len(out) >= maxn:
            break
    return out


def main(cfg, inputs):
    key = str(inputs.get("list") or cfg.get("list") or "drop").lower()
    url = LISTS.get(key, LISTS["drop"])
    raw = _get(url, cfg).decode("utf-8", "replace")
    maxn = int(inputs.get("max_indicators") or 0)
    out = _parse(raw, maxn)
    return {"source": "spamhaus:" + key, "count": len(out), "indicators": out}


_run(main)