gonets/SRV/services/wifi_service.py

import time
import logging
import subprocess
import re
from functools import lru_cache
from typing import List, Optional, Dict, Tuple
from mac_vendor_lookup import MacLookup
import pywifi
from models.wifi import WifiAccessPoint, WifiScanResult
from pathlib import Path
import json
from utils.i18n import get_translations
from babel.support import Translations
from fastapi import Depends

# Настройка логирования
logging.basicConfig(
    level=logging.DEBUG,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)

class WifiStorage:
    """Класс для хранения данных о Wi-Fi сетях и их заметках по SSID.

    Формат::

        {
          "networks": [{"ssid": str, "note": Optional[str]}]
        }

    Поведение:

    - Создаёт директорию хранения при инициализации, ведёт логирование путей.
    - Валидирует структуру при чтении и безопасно записывает JSON с Unicode и отступами.
    """
    def __init__(self, storage_path: str = "storage/wifi/wifi.json", translations: Translations = Depends(get_translations())):
        self.storage_file = Path(storage_path)
        self.storage_file.parent.mkdir(parents=True, exist_ok=True)
        self.translations = translations
        logger.info(f"Wi-Fi storage initialized at: {self.storage_file.absolute()}")

    def load_notes(self) -> Dict[str, Optional[str]]:
        """Загружает заметки по SSID из файла хранения."""
        try:
            if self.storage_file.exists():
                with open(self.storage_file, "r", encoding="utf-8") as f:
                    data = json.load(f)
                    if not isinstance(data, dict) or "networks" not in data:
                        logger.warning(f"Invalid JSON structure in {self.storage_file}, expected {'networks': [...]}, got {data}")
                        return {}
                    return {item["ssid"]: item.get("note") for item in data.get("networks", [])}
            return {}
        except json.JSONDecodeError as e:
            logger.error(f"JSON decode error in {self.storage_file}: {str(e)}")
            return {}
        except Exception as e:
            logger.error(f"Error loading notes from {self.storage_file}: {str(e)}")
            return {}

    def save_notes(self, notes: Dict[str, Optional[str]]) -> None:
        """Сохраняет заметки по SSID в файл."""
        try:
            data = {"networks": [{"ssid": ssid, "note": note} for ssid, note in notes.items()]}
            with open(self.storage_file, "w", encoding="utf-8") as f:
                json.dump(data, f, indent=2, ensure_ascii=False)
            logger.info(f"Saved {len(notes)} notes to {self.storage_file.absolute()}")
        except PermissionError as e:
            logger.error(f"Permission denied writing to {self.storage_file}: {str(e)}")
            raise
        except Exception as e:
            logger.error(f"Error saving notes to {self.storage_file}: {str(e)}")
            raise Exception(self.translations.gettext("Ошибка при сохранении заметок: {error}").format(error=str(e)))

class WifiService:
    """Сервис для сканирования текущих Wi-Fi точек доступа и заметок.

    Источники данных:
        - `pywifi` для базового сканирования и получения списка AP.
        - `iw dev <iface> scan` для уточнения частоты, сигнала и безопасности.
        - `MacLookup` для определения вендора по BSSID.

    Политики:
        - Выбор лучшего AP по SSID по уровню сигнала.
        - Кэширование определения вендора.
        - Сохранение SSID даже без заметок для будущих операций.
    """
    def __init__(self, translations: Translations = Depends(get_translations())):
        self.mac_lookup = MacLookup()
        self.wifi = pywifi.PyWiFi()
        self.interface = self._get_wifi_interface()
        if not hasattr(translations, 'gettext'):
            logger.warning("Translations object does not support gettext, using fallback")
            self.translations = Translations.load("utils/locales/en/LC_MESSAGES/services.mo")
        else:
            self.translations = translations
        self.storage = WifiStorage()

    def _get_wifi_interface(self) -> Optional[object]:
        """Автоматически определяет активный Wi-Fi-интерфейс."""
        try:
            interfaces = self.wifi.interfaces()
            if not interfaces:
                logger.error(self.translations.gettext("Не найдено сетевых интерфейсов"))
                return None

            logger.debug(f"Available interfaces: {[iface.name() for iface in interfaces]}")

            for iface in interfaces:
                iface_name = iface.name()
                if "p2p" in iface_name.lower():
                    logger.debug(f"Skipped interface {iface_name} (P2P)")
                    continue
                try:
                    iface.scan()
                    time.sleep(1)
                    results = iface.scan_results()
                    if results:
                        logger.info(f"Selected Wi-Fi interface: {iface_name}")
                        return iface
                    logger.debug(f"Interface {iface_name} returned no scan results")
                except Exception as e:
                    logger.debug(f"Interface {iface_name} inactive: {str(e)}")

            logger.error(self.translations.gettext("Не найден активный Wi-Fi-интерфейс"))
            return None
        except Exception as e:
            logger.error(f"Error determining Wi-Fi interface: {str(e)}")
            return None

    @lru_cache(maxsize=1000)
    def get_vendor(self, mac: str) -> str:
        """Определяет вендора по MAC-адресу с использованием кэширования."""
        try:
            return self.mac_lookup.lookup(mac)
        except Exception as e:
            logger.warning(f"Failed to determine vendor for MAC {mac}: {str(e)}")
            return self.translations.gettext("Неизвестный")

    def _get_encryption_from_iw(self, ap_info: Dict) -> str:
        """Определяет тип шифрования из данных, полученных через iw."""
        security = ap_info.get("security", "")
        logger.debug(f"Encryption for BSSID {ap_info.get('bssid')}: {security}")
        if "WPA3" in security:
            return self.translations.gettext("WPA3")
        elif "WPA2" in security or "RSN" in security:
            return self.translations.gettext("WPA2")
        elif "WPA" in security:
            return self.translations.gettext("WPA")
        elif "WEP" in security:
            return self.translations.gettext("WEP")
        return self.translations.gettext("Открытая")

    def _get_channel(self, frequency: Optional[int]) -> Optional[int]:
        """Преобразует частоту в номер канала."""
        if frequency is None:
            return None
        try:
            if 2412 <= frequency <= 2472:
                return (frequency - 2412) // 5 + 1
            elif 5180 <= frequency <= 5825:
                return (frequency - 5180) // 5 + 36
            logger.debug(f"Frequency {frequency} outside 2.4/5 GHz range")
            return None
        except Exception as e:
            logger.debug(f"Error determining channel for frequency {frequency}: {str(e)}")
            return None

    def _get_frequency(self, frequency: Optional[int]) -> Optional[str]:
        """Определяет частотный диапазон на основе частоты."""
        if frequency is None:
            return None
        try:
            if 2412 <= frequency <= 2472:
                return self.translations.gettext("2.4 ГГц")
            elif 5180 <= frequency <= 5825:
                return self.translations.gettext("5 ГГц")
            logger.debug(f"Frequency {frequency} outside 2.4/5 GHz range")
            return None
        except Exception as e:
            logger.debug(f"Error determining band for frequency {frequency}: {str(e)}")
            return None

    def _get_iw_scan_data(self) -> List[Dict]:
        """Получает данные сканирования Wi-Fi через команду iw."""
        try:
            if not self.interface:
                logger.error(self.translations.gettext("Интерфейс не определён"))
                return []
            cmd = ["sudo", "iw", "dev", self.interface.name(), "scan"]
            logger.debug(f"Executing command: {' '.join(cmd)}")
            result = subprocess.run(cmd, capture_output=True, text=True, timeout=10)
            if result.returncode != 0:
                logger.error(f"iw scan error: {result.stderr}")
                return []
            output = result.stdout
            logger.debug(f"iw scan output (first 500 chars): {output[:500]}...")

            aps = []
            current_ap = None
            bssid_pattern = re.compile(r"BSS ([0-9a-f:]{17})")
            ssid_pattern = re.compile(r"SSID: ?(.*)")
            freq_pattern = re.compile(r"freq: (\d+)")
            signal_pattern = re.compile(r"signal: ([-\d.]+) dBm")
            rsn_pattern = re.compile(r"RSN:")
            wpa_pattern = re.compile(r"WPA:")
            security_type_pattern = re.compile(r"\* (WPA3|WPA2|WPA|WEP)")

            for line in output.splitlines():
                line = line.strip()
                if bssid_match := bssid_pattern.match(line):
                    if current_ap:
                        aps.append(current_ap)
                    current_ap = {"bssid": bssid_match.group(1).lower(), "security": ""}
                elif current_ap:
                    if ssid_match := ssid_pattern.match(line):
                        current_ap["ssid"] = ssid_match.group(1).strip() if ssid_match.group(1).strip() else ""
                    elif freq_match := freq_pattern.match(line):
                        current_ap["frequency"] = int(freq_match.group(1))
                    elif signal_match := signal_pattern.match(line):
                        current_ap["signal"] = float(signal_match.group(1))
                    elif rsn_pattern.match(line):
                        current_ap["security"] += "RSN;"
                    elif wpa_pattern.match(line):
                        current_ap["security"] += "WPA;"
                    elif security_type_match := security_type_pattern.search(line):
                        current_ap["security"] += security_type_match.group(1) + ";"

            if current_ap:
                aps.append(current_ap)

            logger.debug(f"Found {len(aps)} access points via iw: {[ap['bssid'] for ap in aps]}")
            return aps
        except subprocess.CalledProcessError as e:
            logger.error(f"Error executing iw scan: {e.stderr}")
            return []
        except subprocess.TimeoutExpired:
            logger.error(self.translations.gettext("Таймаут при выполнении iw scan"))
            return []
        except Exception as e:
            logger.error(f"Error parsing iw scan: {str(e)}")
            return []

    def scan_wifi(self, timeout: int = 30) -> WifiScanResult:
        """Сканирует текущие Wi-Fi точки доступа."""
        start_time = time.time()
        aps = []

        if not self.interface:
            logger.error(self.translations.gettext("Wi-Fi-интерфейс не доступен"))
            return WifiScanResult(access_points=aps)

        try:
            logger.info(f"Starting Wi-Fi scan on interface {self.interface.name()}")
            max_attempts = 3
            for attempt in range(max_attempts):
                self.interface.scan()
                time.sleep(min(timeout, 5))
                py_results = self.interface.scan_results()
                if py_results:
                    logger.info(f"Found {len(py_results)} access points via pywifi after attempt {attempt + 1}")
                    break
                else:
                    logger.warning(f"Scan attempt {attempt + 1} failed, trying again (FAIL-BUSY?)")
            else:
                logger.error("All scan attempts failed")
                return WifiScanResult(access_points=aps)

            iw_results = self._get_iw_scan_data()
            iw_by_bssid = {ap["bssid"]: ap for ap in iw_results if ap.get("bssid")}

            best_aps_by_ssid: Dict[str, WifiAccessPoint] = {}
            saved_notes = self.storage.load_notes()

            for ap in py_results:
                bssid = ap.bssid.lower() if ap.bssid else None
                if not bssid:
                    logger.debug("Skipped access point without BSSID")
                    continue
                ssid = ap.ssid if ap.ssid else f"Hidden_{bssid}"
                hidden = not ap.ssid
                signal = ap.signal if ap.signal else None
                iw_data = iw_by_bssid.get(bssid, {})

                frequency = iw_data.get("frequency")
                channel = self._get_channel(frequency)
                freq_band = self._get_frequency(frequency)
                encryption = self._get_encryption_from_iw(iw_data)
                vendor = self.get_vendor(bssid)

                current_ap = WifiAccessPoint(
                    ssid=ssid,
                    bssid=bssid,
                    channel=channel,
                    signal=signal if signal else iw_data.get("signal"),
                    encryption=encryption,
                    frequency=freq_band,
                    vendor=vendor,
                    hidden=hidden,
                    note=saved_notes.get(ssid) if ap.ssid else None,
                )
                logger.debug(f"Processed AP: {current_ap.model_dump()}")

                if ssid not in best_aps_by_ssid or (
                        current_ap.signal and best_aps_by_ssid[ssid].signal
                        and current_ap.signal > best_aps_by_ssid[ssid].signal):
                    current_ap.note = saved_notes.get(ssid) if ap.ssid else None
                    best_aps_by_ssid[ssid] = current_ap

            aps = list(best_aps_by_ssid.values())
            # Сохраняем хотя бы SSID, если заметок нет
            notes_to_save = {ap.ssid: ap.note for ap in aps if ap.ssid}
            if not notes_to_save and aps:
                notes_to_save = {ap.ssid: None for ap in aps if ap.ssid}  # Сохраняем SSID без заметок
            if notes_to_save:
                self.storage.save_notes(notes_to_save)
            else:
                logger.warning("No notes or SSIDs to save, skipping file write")

            logger.info(f"Wi-Fi scan completed, found {len(aps)} unique networks")
            return WifiScanResult(access_points=aps)

        except Exception as e:
            logger.error(f"Error scanning Wi-Fi: {str(e)}")
            return WifiScanResult(access_points=aps)

    def add_note(self, ssid: str, note: str) -> Tuple[bool, Optional[str]]:
        """Добавляет заметку к сети Wi-Fi по SSID."""
        try:
            saved_notes = self.storage.load_notes()
            if ssid not in saved_notes or saved_notes[ssid] is None:
                logger.info(f"Added new note for network with SSID {ssid}")
            elif saved_notes[ssid] is not None:
                logger.error(f"Note for network with SSID {ssid} already exists")
                return False, self.translations.gettext("Заметка для сети с SSID {ssid} уже существует").format(ssid=ssid)
            saved_notes[ssid] = note
            self.storage.save_notes(saved_notes)
            logger.info(f"Added note '{note}' for network with SSID {ssid}")
            return True, None
        except Exception as e:
            logger.error(f"Error adding note for SSID {ssid}: {str(e)}")
            return False, self.translations.gettext("Внутренняя ошибка сервера: {error}").format(error=str(e))

    def update_note(self, ssid: str, note: str) -> Tuple[bool, Optional[str]]:
        """Обновляет заметку сети Wi-Fi по SSID."""
        try:
            saved_notes = self.storage.load_notes()
            if ssid not in saved_notes:
                logger.warning(f"Network with SSID {ssid} not found")
                return False, self.translations.gettext("Сеть с SSID {ssid} не найдена").format(ssid=ssid)
            if saved_notes[ssid] is None:
                logger.error(f"Note for network with SSID {ssid} does not exist")
                return False, self.translations.gettext("Заметка для сети с SSID {ssid} не существует").format(ssid=ssid)
            saved_notes[ssid] = note
            self.storage.save_notes(saved_notes)
            logger.info(f"Updated note '{note}' for network with SSID {ssid}")
            return True, None
        except Exception as e:
            logger.error(f"Error updating note for SSID {ssid}: {str(e)}")
            return False, self.translations.gettext("Внутренняя ошибка сервера: {error}").format(error=str(e))

    def delete_note(self, ssid: str) -> Tuple[bool, Optional[str]]:
        """Удаляет заметку сети Wi-Fi по SSID."""
        try:
            saved_notes = self.storage.load_notes()
            if ssid not in saved_notes:
                logger.warning(f"Network with SSID {ssid} not found")
                return False, self.translations.gettext("Сеть с SSID {ssid} не найдена").format(ssid=ssid)
            if saved_notes[ssid] is None:
                logger.error(f"Note for network with SSID {ssid} does not exist")
                return False, self.translations.gettext("Заметка для сети с SSID {ssid} не существует").format(ssid=ssid)
            saved_notes[ssid] = None
            self.storage.save_notes(saved_notes)
            logger.info(f"Deleted note for network with SSID {ssid}")
            return True, None
        except Exception as e:
            logger.error(f"Error deleting note for SSID {ssid}: {str(e)}")
            return False, self.translations.gettext("Внутренняя ошибка сервера: {error}").format(error=str(e))