#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
web_enum.py — Gobuster Web Enumeration -> DB writer for table `webenum`.

- Writes each finding into the `webenum` table
- ON CONFLICT(mac_address, ip, port, directory) DO UPDATE
- Respects orchestrator stop flag (shared_data.orchestrator_should_exit)
- No filesystem output: parse Gobuster stdout directly
- Filtrage dynamique des statuts HTTP via shared_data.web_status_codes
"""

import re
import socket
import subprocess
import threading
import logging
from typing import List, Dict, Tuple, Optional, Set

from shared import SharedData
from logger import Logger

# -------------------- Logger & module meta --------------------
logger = Logger(name="web_enum.py", level=logging.DEBUG)

b_class     = "WebEnumeration"
b_module    = "web_enum"
b_status    = "WebEnumeration"
b_port      = 80
b_service    = '["http","https"]'
b_trigger    = 'on_any:["on_web_service","on_new_port:80","on_new_port:443","on_new_port:8080","on_new_port:8443","on_new_port:9443","on_new_port:8000","on_new_port:8888","on_new_port:81","on_new_port:5000","on_new_port:5001","on_new_port:7080","on_new_port:9080"]'
b_parent    = None
b_priority  = 9
b_cooldown  = 1800
b_rate_limit = '3/86400'
b_enabled   = 1

# -------------------- Defaults & parsing --------------------
# Valeur de secours si l'UI n'a pas encore initialisé shared_data.web_status_codes
# (par défaut: 2xx utiles, 3xx, 401/403/405 et tous les 5xx; 429 non inclus)
DEFAULT_WEB_STATUS_CODES = [
    200, 201, 202, 203, 204, 206,
    301, 302, 303, 307, 308,
    401, 403, 405,
    "5xx",
]

ANSI_RE = re.compile(r"\x1B\[[0-?]*[ -/]*[@-~]")
CTL_RE  = re.compile(r"[\x00-\x1F\x7F]")  # non-printables

# Gobuster "dir" line examples handled:
# /admin   (Status: 301) [Size: 310] [--> http://10.0.0.5/admin/]
# /images  (Status: 200) [Size: 12345]
GOBUSTER_LINE = re.compile(
    r"""^(?P<path>\S+)\s*
        \(Status:\s*(?P<status>\d{3})\)\s*
        (?:\[Size:\s*(?P<size>\d+)\])?
        (?:\s*\[\-\-\>\s*(?P<redir>[^\]]+)\])?
        """,
    re.VERBOSE
)

def _normalize_status_policy(policy) -> Set[int]:
    """
    Transforme une politique "UI" en set d'entiers HTTP.
    policy peut contenir:
      - int          (ex: 200, 403)
      - "xXX"        (ex: "2xx", "5xx")
      - "a-b"        (ex: "500-504")
    """
    codes: Set[int] = set()
    if not policy:
        policy = DEFAULT_WEB_STATUS_CODES
    for item in policy:
        try:
            if isinstance(item, int):
                if 100 <= item <= 599:
                    codes.add(item)
            elif isinstance(item, str):
                s = item.strip().lower()
                if s.endswith("xx") and len(s) == 3 and s[0].isdigit():
                    base = int(s[0]) * 100
                    codes.update(range(base, base + 100))
                elif "-" in s:
                    a, b = s.split("-", 1)
                    a, b = int(a), int(b)
                    a, b = max(100, a), min(599, b)
                    if a <= b:
                        codes.update(range(a, b + 1))
                else:
                    v = int(s)
                    if 100 <= v <= 599:
                        codes.add(v)
        except Exception:
            logger.warning(f"Ignoring invalid status code token: {item!r}")
    return codes


class WebEnumeration:
    """
    Orchestrates Gobuster web dir enum and writes normalized results into DB.
    In-memory only: no CSV, no temp files.
    """
    def __init__(self, shared_data: SharedData):
        self.shared_data = shared_data
        self.gobuster_path = "/usr/bin/gobuster"  # verify with `which gobuster`
        self.wordlist = self.shared_data.common_wordlist
        self.lock = threading.Lock()

        # ---- Sanity checks
        import os
        if not os.path.exists(self.gobuster_path):
            raise FileNotFoundError(f"Gobuster not found at {self.gobuster_path}")
        if not os.path.exists(self.wordlist):
            raise FileNotFoundError(f"Wordlist not found: {self.wordlist}")

        # Politique venant de l’UI : créer si absente
        if not hasattr(self.shared_data, "web_status_codes") or not self.shared_data.web_status_codes:
            self.shared_data.web_status_codes = DEFAULT_WEB_STATUS_CODES.copy()

        logger.info(
            f"WebEnumeration initialized (stdout mode, no files). "
            f"Using status policy: {self.shared_data.web_status_codes}"
        )

    # -------------------- Utilities --------------------
    def _scheme_for_port(self, port: int) -> str:
        https_ports = {443, 8443, 9443, 10443, 9444, 5000, 5001, 7080, 9080}
        return "https" if int(port) in https_ports else "http"

    def _reverse_dns(self, ip: str) -> Optional[str]:
        try:
            name, _, _ = socket.gethostbyaddr(ip)
            return name
        except Exception:
            return None

    def _extract_identity(self, row: Dict) -> Tuple[str, Optional[str]]:
        """Return (mac_address, hostname) from a row with tolerant keys."""
        mac = row.get("mac_address") or row.get("mac") or row.get("MAC") or ""
        hostname = row.get("hostname") or row.get("Hostname") or None
        return str(mac), (str(hostname) if hostname else None)

    # -------------------- Filter helper --------------------
    def _allowed_status_set(self) -> Set[int]:
        """Recalcule à chaque run pour refléter une mise à jour UI en live."""
        try:
            return _normalize_status_policy(getattr(self.shared_data, "web_status_codes", None))
        except Exception as e:
            logger.error(f"Failed to load shared_data.web_status_codes: {e}")
            return _normalize_status_policy(DEFAULT_WEB_STATUS_CODES)

    # -------------------- DB Writer --------------------
    def _db_add_result(self,
                       mac_address: str,
                       ip: str,
                       hostname: Optional[str],
                       port: int,
                       directory: str,
                       status: int,
                       size: int = 0,
                       response_time: int = 0,
                       content_type: Optional[str] = None,
                       tool: str = "gobuster") -> None:
        """Upsert a single record into `webenum`."""
        try:
            self.shared_data.db.execute("""
                INSERT INTO webenum (
                    mac_address, ip, hostname, port, directory, status,
                    size, response_time, content_type, tool, is_active
                ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 1)
                ON CONFLICT(mac_address, ip, port, directory) DO UPDATE SET
                    status        = excluded.status,
                    size          = excluded.size,
                    response_time = excluded.response_time,
                    content_type  = excluded.content_type,
                    hostname      = COALESCE(excluded.hostname, webenum.hostname),
                    tool          = COALESCE(excluded.tool, webenum.tool),
                    last_seen     = CURRENT_TIMESTAMP,
                    is_active     = 1
            """, (mac_address, ip, hostname, int(port), directory, int(status),
                  int(size or 0), int(response_time or 0), content_type, tool))
            logger.debug(f"DB upsert: {ip}:{port}{directory} -> {status} (size={size})")
        except Exception as e:
            logger.error(f"DB insert error for {ip}:{port}{directory}: {e}")

    # -------------------- Gobuster runner (stdout) --------------------
    def _run_gobuster_stdout(self, url: str) -> Optional[str]:
        base_cmd = [
            self.gobuster_path, "dir",
            "-u", url,
            "-w", self.wordlist,
            "-t", "10",
            "--quiet",
            "--no-color",
            # Si supporté par ta version gobuster, tu peux réduire le bruit dès la source :
            # "-b", "404,429",
        ]

        def run(cmd):
            return subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)

        # Try with -z first
        cmd = base_cmd + ["-z"]
        logger.info(f"Running Gobuster on {url}...")
        try:
            res = run(cmd)
            if res.returncode == 0:
                logger.success(f"Gobuster OK on {url}")
                return res.stdout or ""
            # Fallback if -z is unknown
            if "unknown flag" in (res.stderr or "").lower() or "invalid" in (res.stderr or "").lower():
                logger.info("Gobuster doesn't support -z, retrying without it.")
                res2 = run(base_cmd)
                if res2.returncode == 0:
                    logger.success(f"Gobuster OK on {url} (no -z)")
                    return res2.stdout or ""
                logger.info(f"Gobuster failed on {url}: {res2.stderr.strip()}")
                return None
            logger.info(f"Gobuster failed on {url}: {res.stderr.strip()}")
            return None
        except Exception as e:
            logger.error(f"Gobuster exception on {url}: {e}")
            return None

    def _parse_gobuster_text(self, text: str) -> List[Dict]:
        """
        Parse gobuster stdout lines into entries:
        { 'path': '/admin', 'status': 301, 'size': 310, 'redirect': 'http://...'|None }
        """
        entries: List[Dict] = []
        if not text:
            return entries

        for raw in text.splitlines():
            # 1) strip ANSI/control BEFORE regex
            line = ANSI_RE.sub("", raw)
            line = CTL_RE.sub("", line)
            line = line.strip()
            if not line:
                continue

            m = GOBUSTER_LINE.match(line)
            if not m:
                logger.debug(f"Unparsed line: {line}")
                continue

            # 2) extract all fields NOW
            path  = m.group("path") or ""
            status = int(m.group("status"))
            size   = int(m.group("size") or 0)
            redir  = m.group("redir")

            # 3) normalize path
            if not path.startswith("/"):
                path = "/" + path
            path = "/" + path.strip("/")

            entries.append({
                "path": path,
                "status": status,
                "size": size,
                "redirect": redir.strip() if redir else None
            })

        logger.info(f"Parsed {len(entries)} entries from gobuster stdout")
        return entries

    # -------------------- Public API --------------------
    def execute(self, ip: str, port: int, row: Dict, status_key: str) -> str:
        """
        Run gobuster on (ip,port), parse stdout, upsert each finding into DB.
        Returns: 'success' | 'failed' | 'interrupted'
        """
        try:
            if self.shared_data.orchestrator_should_exit:
                logger.info("Interrupted before start (orchestrator flag).")
                return "interrupted"

            scheme = self._scheme_for_port(port)
            base_url = f"{scheme}://{ip}:{port}"
            logger.info(f"Enumerating {base_url} ...")
            self.shared_data.bjornorch_status = "WebEnumeration"

            if self.shared_data.orchestrator_should_exit:
                logger.info("Interrupted before gobuster run.")
                return "interrupted"

            stdout_text = self._run_gobuster_stdout(base_url)
            if stdout_text is None:
                return "failed"

            if self.shared_data.orchestrator_should_exit:
                logger.info("Interrupted after gobuster run (stdout captured).")
                return "interrupted"

            entries = self._parse_gobuster_text(stdout_text)
            if not entries:
                logger.warning(f"No entries for {base_url}.")
                return "success"  # scan ran fine but no findings

            # ---- Filtrage dynamique basé sur shared_data.web_status_codes
            allowed = self._allowed_status_set()
            pre = len(entries)
            entries = [e for e in entries if e["status"] in allowed]
            post = len(entries)
            if post < pre:
                preview = sorted(list(allowed))[:10]
                logger.info(
                    f"Filtered out {pre - post} entries not in policy "
                    f"{preview}{'...' if len(allowed) > 10 else ''}."
                )

            mac_address, hostname = self._extract_identity(row)
            if not hostname:
                hostname = self._reverse_dns(ip)

            for e in entries:
                self._db_add_result(
                    mac_address=mac_address,
                    ip=ip,
                    hostname=hostname,
                    port=port,
                    directory=e["path"],
                    status=e["status"],
                    size=e.get("size", 0),
                    response_time=0,     # gobuster doesn't expose timing here
                    content_type=None,   # unknown here; a later HEAD/GET probe can fill it
                    tool="gobuster"
                )

            return "success"

        except Exception as e:
            logger.error(f"Execute error on {ip}:{port}: {e}")
            return "failed"


# -------------------- CLI mode (debug/manual) --------------------
if __name__ == "__main__":
    shared_data = SharedData()
    try:
        web_enum = WebEnumeration(shared_data)
        logger.info("Starting web directory enumeration...")

        rows = shared_data.read_data()
        for row in rows:
            ip = row.get("IPs") or row.get("ip")
            if not ip:
                continue
            port = row.get("port") or 80
            logger.info(f"Execute WebEnumeration on {ip}:{port} ...")
            status = web_enum.execute(ip, int(port), row, "enum_web_directories")
            if status == "success":
                logger.success(f"Enumeration successful for {ip}:{port}.")
            elif status == "interrupted":
                logger.warning(f"Enumeration interrupted for {ip}:{port}.")
                break
            else:
                logger.failed(f"Enumeration failed for {ip}:{port}.")

        logger.info("Web directory enumeration completed.")
    except Exception as e:
        logger.error(f"General execution error: {e}")