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backend/app/core/security.py

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+from __future__ import annotations
+
+from datetime import datetime, timedelta, timezone
+from typing import Any
+
+from cryptography.fernet import Fernet
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+
+from .config import get_settings
+
+settings = get_settings()
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+ALGORITHM = "HS256"
+
+
+def hash_password(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return pwd_context.verify(plain, hashed)
+
+
+def _now() -> datetime:
+    return datetime.now(timezone.utc)
+
+
+def create_access_token(subject: str | int, extra: dict[str, Any] | None = None) -> str:
+    payload: dict[str, Any] = {
+        "sub": str(subject),
+        "type": "access",
+        "iat": _now(),
+        "exp": _now() + timedelta(minutes=settings.access_token_expire_minutes),
+    }
+    if extra:
+        payload.update(extra)
+    return jwt.encode(payload, settings.secret_key, algorithm=ALGORITHM)
+
+
+def create_refresh_token(subject: str | int) -> str:
+    payload = {
+        "sub": str(subject),
+        "type": "refresh",
+        "iat": _now(),
+        "exp": _now() + timedelta(days=settings.refresh_token_expire_days),
+    }
+    return jwt.encode(payload, settings.secret_key, algorithm=ALGORITHM)
+
+
+def decode_token(token: str) -> dict[str, Any]:
+    try:
+        return jwt.decode(token, settings.secret_key, algorithms=[ALGORITHM])
+    except JWTError as exc:  # pragma: no cover
+        raise ValueError(f"invalid token: {exc}") from exc
+
+
+# --- Симметричное шифрование секретов устройств -----------------------------
+# Производный ключ из SECRET_KEY (для dev). В prod — KMS / Vault.
+
+def _fernet() -> Fernet:
+    import base64
+    import hashlib
+
+    digest = hashlib.sha256(settings.secret_key.encode()).digest()
+    key = base64.urlsafe_b64encode(digest)
+    return Fernet(key)
+
+
+def encrypt_secret(value: str) -> str:
+    return _fernet().encrypt(value.encode()).decode()
+
+
+def decrypt_secret(token: str) -> str:
+    return _fernet().decrypt(token.encode()).decode()