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

API_VERSION = "2023-11-01"


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


def _token():
    cfg = _cfg()
    data = urllib.parse.urlencode({
        "grant_type": "client_credentials",
        "client_id": str(cfg.get("client_id") or ""),
        "client_secret": str(cfg.get("client_secret") or ""),
        "scope": "https://management.azure.com/.default",
    }).encode("utf-8")
    url = "https://login.microsoftonline.com/" + str(cfg.get("tenant_id") or "") + "/oauth2/v2.0/token"
    req = urllib.request.Request(url, data=data,
                                 headers={"Content-Type": "application/x-www-form-urlencoded", "Accept": "application/json"},
                                 method="POST")
    with urllib.request.urlopen(req, timeout=60) as r:
        tok = json.loads(r.read())
    if not tok.get("access_token"):
        raise Exception("Token request failed: " + json.dumps(tok))
    return tok["access_token"]


def _si_base():
    cfg = _cfg()
    for key in ("subscription_id", "resource_group", "workspace_name"):
        if not str(cfg.get(key) or ""):
            raise Exception(key + " is not set")
    return ("https://management.azure.com/subscriptions/" + str(cfg["subscription_id"])
            + "/resourceGroups/" + str(cfg["resource_group"])
            + "/providers/Microsoft.OperationalInsights/workspaces/" + str(cfg["workspace_name"])
            + "/providers/Microsoft.SecurityInsights")


def request(method, path, params=None, body=None, token=None):
    url = _si_base() + path
    q = {k: str(x) for k, x in (params or {}).items() if x not in (None, "")}
    q["api-version"] = API_VERSION
    url += ("&" if "?" in url else "?") + urllib.parse.urlencode(q)
    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Accept": "application/json", "Authorization": "Bearer " + (token or _token())}
    if data is not None:
        headers["Content-Type"] = "application/json"
    req = urllib.request.Request(url, data=data, headers=headers, method=method)
    with urllib.request.urlopen(req, timeout=90) as r:
        raw = r.read()
        return json.loads(raw) if raw else {}


def main():
    inputs = json.loads(os.environ.get("INTEGRATION_INPUTS", "{}"))
    value = inputs.get("value")
    pattern_type = inputs.get("pattern_type")
    if not value:
        raise Exception("value is required")
    if not pattern_type:
        raise Exception("pattern_type is required")

    display_name = inputs.get("display_name") or value
    threat_types_raw = inputs.get("threat_types")
    if threat_types_raw:
        threat_types = [t.strip() for t in str(threat_types_raw).split(",") if t.strip()]
    else:
        threat_types = ["malicious-activity"]
    confidence = inputs.get("confidence")
    valid_until = inputs.get("valid_until")

    if str(pattern_type).startswith("file"):
        pattern = "[" + str(pattern_type) + " = '" + str(value) + "']"
    else:
        pattern = "[" + str(pattern_type) + ":value = '" + str(value) + "']"

    props = {
        "pattern": pattern,
        "patternType": pattern_type,
        "displayName": display_name,
        "threatTypes": threat_types,
        "source": "Riposte",
    }
    if confidence is not None and confidence != "":
        props["confidence"] = int(confidence)
    if valid_until:
        props["validUntil"] = valid_until

    body = {"kind": "indicator", "properties": props}
    res = request("POST", "/threatIntelligence/main/createIndicator", body=body)
    print(json.dumps(res))


try:
    main()
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)