v0.0.1 first commit

app/crypto.py

@@ -0,0 +1,28 @@
+from pathlib import Path
+
+from cryptography.fernet import Fernet
+
+
+class CryptoManager:
+    def __init__(self, key_path: Path) -> None:
+        self.key_path = key_path
+
+    def _load_or_create_key(self) -> bytes:
+        if self.key_path.exists():
+            return self.key_path.read_bytes().strip()
+
+        self.key_path.parent.mkdir(parents=True, exist_ok=True)
+        key = Fernet.generate_key()
+        self.key_path.write_bytes(key)
+        return key
+
+    def _fernet(self) -> Fernet:
+        return Fernet(self._load_or_create_key())
+
+    def encrypt_text(self, value: str) -> str:
+        token = self._fernet().encrypt(value.encode("utf-8"))
+        return token.decode("utf-8")
+
+    def decrypt_text(self, token: str) -> str:
+        value = self._fernet().decrypt(token.encode("utf-8"))
+        return value.decode("utf-8")