Initial commit

lab5-account-manager-security/core/account_manager.py

@@ -0,0 +1,62 @@
+import json
+from pathlib import Path
+
+
+class AccountManager:
+    """
+    Класс для управления учётными записями пользователей.
+    """
+
+    def __init__(self, db_file: str | None):
+        self.db_file = Path(db_file) if db_file else None
+        if isinstance(self.db_file, Path) and not self.db_file.exists():
+            self._save_db({})
+
+    def set_db_file(self, db_file: str | None) -> None:
+        self.db_file = Path(db_file) if db_file else None
+        if isinstance(self.db_file, Path) and not self.db_file.exists():
+            self._save_db({})
+
+    def _load_db(self) -> dict:
+        if not isinstance(self.db_file, Path):
+            return {}
+        if self.db_file.exists():
+            return json.loads(self.db_file.read_text(encoding="utf-8"))
+        return {}
+
+    def _save_db(self, data: dict) -> None:
+        if not isinstance(self.db_file, Path):
+            raise RuntimeError("База данных не открыта")
+        self.db_file.write_text(json.dumps(
+            data, indent=2, ensure_ascii=False), encoding="utf-8")
+
+    def add_user(self, username: str, password_hash: str, salt: str) -> None:
+        data = self._load_db()
+        data[username] = {"hash": password_hash, "salt": salt}
+        self._save_db(data)
+
+    def update_user(self, username: str, password_hash: str, salt: str) -> bool:
+        data = self._load_db()
+        if username not in data:
+            return False
+        data[username] = {"hash": password_hash, "salt": salt}
+        self._save_db(data)
+        return True
+
+    def delete_user(self, username: str) -> bool:
+        data = self._load_db()
+        if username not in data:
+            return False
+        del data[username]
+        self._save_db(data)
+        return True
+
+    def get_user(self, username: str) -> dict | None:
+        data = self._load_db()
+        return data.get(username)
+
+    def list_users(self) -> list[str]:
+        if not isinstance(self.db_file, Path):
+            return []
+        data = self._load_db()
+        return list(data.keys())