import json, os, sys, re, ssl, urllib.request, urllib.error
import xml.etree.ElementTree as ET

_URL = re.compile(r"https?://[^\s<>\"'\]\)]+", re.I)
_IP = re.compile(r"\b(?:\d{1,3}\.){3}\d{1,3}\b")
_HASH = re.compile(r"\b[a-fA-F0-9]{64}\b|\b[a-fA-F0-9]{40}\b|\b[a-fA-F0-9]{32}\b")


def _defang(t):
    for a, b in (("[.]", "."), ("(.)", "."), ("{.}", "."), ("[dot]", "."),
                 ("(dot)", "."), ("[:]", ":"), ("[://]", "://"),
                 ("hxxp", "http"), ("hXXp", "http"), ("hxxps", "https")):
        t = t.replace(a, b)
    return t


def _valid_ip(ip):
    parts = ip.split(".")
    return len(parts) == 4 and all(p.isdigit() and 0 <= int(p) <= 255 for p in parts)


def _localname(tag):
    return tag.split("}")[-1] if "}" in tag else tag


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 _headers(cfg):
    h = {"User-Agent": "Riposte-SOAR", "Accept": "application/rss+xml, application/xml, text/xml"}
    t = cfg.get("api_token")
    if t:
        h["Authorization"] = "Bearer " + str(t)
    return h


def _get(url, cfg):
    req = urllib.request.Request(url, headers=_headers(cfg))
    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")
    if not url:
        raise Exception("feed_url is required")

    raw = _get(url, cfg)
    root = ET.fromstring(raw)

    texts = []
    for el in root.iter():
        if _localname(el.tag) in ("item", "entry"):
            texts.append(_defang(" ".join(el.itertext())))
    blob = " ".join(texts) if texts else _defang(ET.tostring(root, encoding="unicode"))

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

    def add(value, typ):
        key = (typ, value)
        if key in seen:
            return
        seen.add(key)
        out.append({"value": value, "type": typ})

    for m in _URL.finditer(blob):
        add(m.group(0).rstrip(".,);]’"), "url")
    for m in _HASH.finditer(blob):
        add(m.group(0), "hash")
    for m in _IP.finditer(blob):
        v = m.group(0)
        if _valid_ip(v):
            add(v, "ip")

    if maxn and len(out) > maxn:
        out = out[:maxn]

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


_run(main)