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

URL = "https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.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 main(cfg, inputs):
    ransomware_only = bool(inputs.get("ransomware_only"))
    raw = _get(URL, cfg)
    data = json.loads(raw) if raw else {}

    maxn = int(inputs.get("max_indicators") or 0)
    out = []
    for v in data.get("vulnerabilities", []):
        if not isinstance(v, dict):
            continue
        cid = v.get("cveID")
        if not cid:
            continue
        ransom = v.get("knownRansomwareCampaignUse")
        if ransomware_only and str(ransom).lower() != "known":
            continue
        out.append({
            "value": cid,
            "type": "cve",
            "vendor": v.get("vendorProject"),
            "product": v.get("product"),
            "name": v.get("vulnerabilityName"),
            "date_added": v.get("dateAdded"),
            "due_date": v.get("dueDate"),
            "ransomware": ransom,
            "tags": ["cisa-kev", "exploited"],
        })
        if maxn and len(out) >= maxn:
            break

    return {
        "source": "cisa:kev",
        "count": len(out),
        "indicators": out,
        "catalog_version": data.get("catalogVersion"),
    }


_run(main)