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AzA march 2026 - Kopie (18)/aza_activation.py
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206
AzA march 2026 - Kopie (18)/aza_activation.py
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# -*- coding: utf-8 -*-
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"""
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AZA Aktivierungsschlüssel-System.
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Ermöglicht dem Entwickler, Freigabeschlüssel für beliebige Geräte zu
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erzeugen. Die App prüft beim Start:
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1. Hartes Ablaufdatum (APP_HARD_EXPIRY)
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2. Gültigen Aktivierungsschlüssel (optional, verlängert über APP_HARD_EXPIRY hinaus)
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Schlüssel-Format: AZA-YYYYMMDD-<hmac_hex[:12]>
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- YYYY-MM-DD = Ablaufdatum des Schlüssels
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- HMAC-SHA256(expiry_str, secret)[:12] = Signatur
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"""
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import hmac
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import hashlib
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import json
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import os
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import time
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from datetime import datetime, date
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from typing import Optional, Tuple
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from aza_config import (
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get_writable_data_dir,
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ACTIVATION_CONFIG_FILENAME,
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ACTIVATION_HMAC_SECRET,
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APP_HARD_EXPIRY,
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APP_TRIAL_DAYS,
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)
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def _activation_path() -> str:
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return os.path.join(get_writable_data_dir(), ACTIVATION_CONFIG_FILENAME)
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def _sign(expiry_str: str) -> str:
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"""12 Zeichen HMAC-Hex-Signatur für ein Ablaufdatum."""
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sig = hmac.new(
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ACTIVATION_HMAC_SECRET.encode("utf-8"),
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expiry_str.encode("utf-8"),
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hashlib.sha256,
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).hexdigest()
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return sig[:12]
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# ── Schlüssel generieren (für den Entwickler) ──────────────────────
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def generate_key(expiry_date: str) -> str:
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"""Erzeugt einen Aktivierungsschlüssel.
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Args:
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expiry_date: Ablaufdatum als 'YYYY-MM-DD'.
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Returns:
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Schlüssel im Format 'AZA-YYYYMMDD-<sig>'.
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"""
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dt = datetime.strptime(expiry_date, "%Y-%m-%d")
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tag = dt.strftime("%Y%m%d")
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sig = _sign(tag)
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return f"AZA-{tag}-{sig}"
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# ── Schlüssel validieren ───────────────────────────────────────────
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def validate_key(key: str) -> Tuple[bool, Optional[date], str]:
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"""Prüft einen Aktivierungsschlüssel.
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Returns:
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(valid, expiry_date_or_None, reason_text)
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"""
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if not key or not isinstance(key, str):
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return False, None, "Kein Schlüssel eingegeben."
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key = key.strip().upper()
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parts = key.split("-")
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if len(parts) != 3 or parts[0] != "AZA":
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return False, None, "Ungültiges Schlüsselformat."
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date_part, sig_part = parts[1], parts[2].lower()
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try:
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expiry = datetime.strptime(date_part, "%Y%m%d").date()
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except ValueError:
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return False, None, "Ungültiges Datum im Schlüssel."
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expected_sig = _sign(date_part)
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if not hmac.compare_digest(sig_part, expected_sig):
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return False, None, "Schlüssel-Signatur ungültig."
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if expiry < date.today():
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return False, expiry, f"Schlüssel abgelaufen am {expiry.strftime('%d.%m.%Y')}."
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return True, expiry, f"Gültig bis {expiry.strftime('%d.%m.%Y')}."
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# ── Persistenz ─────────────────────────────────────────────────────
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def save_activation_key(key: str) -> None:
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path = _activation_path()
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data = {"key": key.strip(), "saved_at": int(time.time())}
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with open(path, "w", encoding="utf-8") as f:
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json.dump(data, f, ensure_ascii=False, indent=2)
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def load_activation_key() -> Optional[str]:
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path = _activation_path()
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if not os.path.isfile(path):
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return None
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try:
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with open(path, "r", encoding="utf-8") as f:
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data = json.load(f)
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return data.get("key")
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except Exception:
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return None
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# ── Startup-Check ──────────────────────────────────────────────────
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def _get_install_date_file() -> str:
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return os.path.join(get_writable_data_dir(), "install_date.json")
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def _get_install_date() -> date:
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"""Liefert das Erstinstallations-Datum; legt es beim ersten Aufruf an."""
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path = _get_install_date_file()
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if os.path.isfile(path):
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try:
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with open(path, "r", encoding="utf-8") as f:
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data = json.load(f)
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return datetime.strptime(data["install_date"], "%Y-%m-%d").date()
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except Exception:
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pass
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install_d = date.today()
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try:
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os.makedirs(os.path.dirname(path), exist_ok=True)
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with open(path, "w", encoding="utf-8") as f:
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json.dump({"install_date": install_d.strftime("%Y-%m-%d")}, f)
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except Exception:
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pass
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return install_d
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def check_app_access() -> Tuple[bool, str]:
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"""Prüft ob die App gestartet werden darf.
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Logik:
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1. Gespeicherter Aktivierungsschlüssel vorhanden und gültig? -> OK
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2. Testphase (APP_TRIAL_DAYS ab Erstinstallation) noch nicht abgelaufen? -> OK
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3. Hartes Ablaufdatum (APP_HARD_EXPIRY) als Sicherheitsnetz -> Gesperrt
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4. Sonst -> Gesperrt
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Returns:
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(allowed, user_message)
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"""
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stored_key = load_activation_key()
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if stored_key:
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valid, expiry, reason = validate_key(stored_key)
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if valid:
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days_left = (expiry - date.today()).days
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return True, f"Aktiviert bis {expiry.strftime('%d.%m.%Y')} ({days_left} Tage verbleibend)."
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install_d = _get_install_date()
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from datetime import timedelta
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trial_end = install_d + timedelta(days=APP_TRIAL_DAYS)
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today = date.today()
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try:
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hard_expiry = datetime.strptime(APP_HARD_EXPIRY, "%Y-%m-%d").date()
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except ValueError:
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hard_expiry = None
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if hard_expiry and today > hard_expiry:
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if stored_key:
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_, _, reason = validate_key(stored_key)
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return False, f"Testphase und Aktivierung abgelaufen.\n{reason}\nBitte neuen Aktivierungsschlüssel eingeben."
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return False, "Testphase abgelaufen.\nBitte Aktivierungsschlüssel eingeben, um fortzufahren."
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if today <= trial_end:
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days_left = (trial_end - today).days
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return True, f"Testphase: noch {days_left} Tag(e) verbleibend (bis {trial_end.strftime('%d.%m.%Y')})."
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if stored_key:
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_, _, reason = validate_key(stored_key)
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return False, f"Testphase abgelaufen.\n{reason}\nBitte neuen Aktivierungsschlüssel eingeben."
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return False, f"Die {APP_TRIAL_DAYS}-tägige Testphase ist abgelaufen.\nBitte Aktivierungsschlüssel eingeben, um fortzufahren."
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# ── CLI-Hilfsmittel zum Generieren (für den Entwickler) ────────────
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if __name__ == "__main__":
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import sys as _sys
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if len(_sys.argv) < 2:
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print("Verwendung: python aza_activation.py <YYYY-MM-DD>")
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print("Beispiel: python aza_activation.py 2026-06-30")
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_sys.exit(1)
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exp = _sys.argv[1]
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key = generate_key(exp)
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print(f"\nAktivierungsschlüssel generiert:")
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print(f" Ablaufdatum: {exp}")
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print(f" Schlüssel: {key}")
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ok, dt, msg = validate_key(key)
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print(f" Validierung: {'OK' if ok else 'FEHLER'} – {msg}")
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