keychain: store SecretStr in _d for deep repr masking

memory/keychain.py

@@ -9,18 +9,19 @@ _MASK = hashlib.sha256(f"{_user}@ga_keychain".encode()).digest()
 def _xor(data: bytes) -> bytes:
     return bytes(b ^ _MASK[i % len(_MASK)] for i, b in enumerate(data))
 
+print('# SecretStr.use() to get raw, do not print raw value! | keys.ls() to list all keys')
+
 class SecretStr:
     def __init__(self, name: str, val: str):
         self._name, self._val = name, val
-    def use(self) -> str:
-        return self._val
+    def use(self) -> str: return self._val
     def __repr__(self):
         n = len(self._val)
         if n <= 4:     preview = '***'
         elif n <= 16:  preview = f"{self._val[:3]}···{self._val[-3:]}"
         elif n <= 40:  preview = f"{self._val[:6]}···{self._val[-6:]} len={n}"
         else:          preview = f"{self._val[:10]}···{self._val[-6:]} len={n}"
-        return f"SecretStr({self._name}={preview}) # .use() to get raw, do not print raw value"
+        return f"SecretStr({self._name}={preview})"
     __str__ = __repr__
 
 class _Keys:
@@ -28,19 +29,25 @@ class _Keys:
         self._d = {}
         if _PATH.exists():
             try:
-                self._d = json.loads(_xor(_PATH.read_bytes()))
+                raw = json.loads(_xor(_PATH.read_bytes()))
+                self._d = {k: SecretStr(k, v) for k, v in raw.items()}
             except Exception as e:
                 print(f"[keychain] WARNING: failed to load {_PATH}: {e}")
                 print(f"[keychain] Starting with empty keychain. Old file kept as .bak")
                 _PATH.rename(_PATH.with_suffix('.enc.bak'))
+    def _save(self):
+        raw = {k: v.use() for k, v in self._d.items()}
+        _PATH.write_bytes(_xor(json.dumps(raw).encode()))
     def __getattr__(self, k):
         if k.startswith('_'): raise AttributeError(k)
         if k not in self._d: raise KeyError(f"No secret: {k}")
-        return SecretStr(k, self._d[k])
+        return self._d[k]
+    def __repr__(self):
+        return f"Keychain({len(self._d)} secrets: {', '.join(self._d.keys())})"
     def set(self, k, v=None, *, file=None):
         if file: v = pathlib.Path(file).read_text().strip()
-        self._d[k] = v
-        _PATH.write_bytes(_xor(json.dumps(self._d).encode()))
+        self._d[k] = SecretStr(k, v)
+        self._save()
     def ls(self): return list(self._d.keys())
 
 keys = _Keys()