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

DEFAULT_URL = "https://feeds.dshield.org/block.txt"


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"})
    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 main(cfg, inputs):
    url = cfg.get("feed_url") or DEFAULT_URL
    raw = _get(url, cfg).decode("utf-8", "replace")

    maxn = int(inputs.get("max_indicators") or 0)
    out = []
    for line in raw.splitlines():
        line = line.rstrip()
        if not line or line.lstrip().startswith("#"):
            continue
        # tab-separated: Start End Netmask Attacks Name Country Email
        cols = line.split("\t")
        if len(cols) < 3:
            cols = line.split()
        if len(cols) < 3:
            continue
        start = cols[0].strip()
        netmask = cols[2].strip()
        if start.count(".") != 3 or not netmask.isdigit():
            continue
        item = {"value": start + "/" + netmask, "type": "cidr", "start": start, "netmask": netmask}
        if len(cols) > 5 and cols[5].strip():
            item["country"] = cols[5].strip()
        out.append(item)
        if maxn and len(out) >= maxn:
            break

    return {"source": "dshield:block", "count": len(out), "indicators": out}


_run(main)