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

URL = "https://ip-ranges.amazonaws.com/ip-ranges.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):
    region = inputs.get("region") or cfg.get("region")
    service = inputs.get("service") or cfg.get("service")
    raw = _get(URL, cfg)
    data = json.loads(raw) if raw else {}

    maxn = int(inputs.get("max_indicators") or 0)
    out = []

    def add(prefixes, field):
        for p in prefixes:
            if not isinstance(p, dict):
                continue
            cidr = p.get(field)
            if not cidr:
                continue
            if region and p.get("region") != region:
                continue
            if service and p.get("service") != service:
                continue
            out.append({
                "value": cidr,
                "type": "cidr",
                "region": p.get("region"),
                "service": p.get("service"),
                "provider": "aws",
            })
            if maxn and len(out) >= maxn:
                return True
        return False

    if not add(data.get("prefixes", []), "ip_prefix"):
        add(data.get("ipv6_prefixes", []), "ipv6_prefix")

    return {"source": "aws:ip-ranges", "count": len(out), "indicators": out}


_run(main)