utils.py

from cryptography.fernet import Fernet
import json, os, secrets, string

KEY_FILE = "key.key"

# Générer ou charger clé
def load_key():
    if not os.path.exists(KEY_FILE):
        key = Fernet.generate_key()
        with open(KEY_FILE, "wb") as f:
            f.write(key)
    else:
        with open(KEY_FILE, "rb") as f:
            key = f.read()
    return Fernet(key)

fernet = load_key()

# Chiffre un dictionnaire
def encrypt_data(data: dict):
    return fernet.encrypt(json.dumps(data).encode())

# Déchiffre
def decrypt_data(enc_data: bytes):
    return json.loads(fernet.decrypt(enc_data).decode())

# Charger base
def load_db(path="db.json.enc"):
    if not os.path.exists(path):
        return {}
    with open(path, "rb") as f:
        return decrypt_data(f.read())

# Sauvegarder base
def save_db(data: dict, path="db.json.enc"):
    with open(path, "wb") as f:
        f.write(encrypt_data(data))

# Générer mot de passe fort
def generate_password(length=16):
    alphabet = string.ascii_letters + string.digits + string.punctuation
    return ''.join(secrets.choice(alphabet) for _ in range(length))

# Vérifier force mot de passe
def is_strong(password):
    return (
        len(password) >= 12 and
        any(c.islower() for c in password) and
        any(c.isupper() for c in password) and
        any(c.isdigit() for c in password) and
        any(c in string.punctuation for c in password)
    )