Keys: Remove appdirs and improve typing

bumble/keys.py

@@ -27,6 +27,7 @@
 import json
 import logging
 import os
+import pathlib
 from typing import TYPE_CHECKING, Any
 
 from typing_extensions import Self
@@ -248,29 +249,26 @@ class without a namespace. With the default namespace, reading from a file will
     DEFAULT_NAMESPACE = '__DEFAULT__'
     DEFAULT_BASE_NAME = "keys"
 
-    def __init__(self, namespace, filename=None):
-        self.namespace = namespace if namespace is not None else self.DEFAULT_NAMESPACE
+    def __init__(
+        self, namespace: str | None = None, filename: str | None = None
+    ) -> None:
+        self.namespace = namespace or self.DEFAULT_NAMESPACE
 
-        if filename is None:
-            # Use a default for the current user
+        if filename:
+            self.filename = pathlib.Path(filename).resolve()
+            self.directory_name = self.filename.parent
+        else:
+            import platformdirs  # Deferred import
 
-            # Import here because this may not exist on all platforms
-            # pylint: disable=import-outside-toplevel
-            import appdirs
+            base_dir = platformdirs.user_data_path(self.APP_NAME, self.APP_AUTHOR)
+            self.directory_name = base_dir / self.KEYS_DIR
 
-            self.directory_name = os.path.join(
-                appdirs.user_data_dir(self.APP_NAME, self.APP_AUTHOR), self.KEYS_DIR
-            )
-            base_name = self.DEFAULT_BASE_NAME if namespace is None else self.namespace
-            json_filename = (
-                f'{base_name}.json'.lower().replace(':', '-').replace('/p', '-p')
-            )
-            self.filename = os.path.join(self.directory_name, json_filename)
-        else:
-            self.filename = filename
-            self.directory_name = os.path.dirname(os.path.abspath(self.filename))
+            base_name = self.namespace if namespace else self.DEFAULT_BASE_NAME
+            safe_name = base_name.lower().replace(':', '-').replace('/', '-')
+
+            self.filename = self.directory_name / f"{safe_name}.json"
 
-        logger.debug(f'JSON keystore: {self.filename}')
+        logger.debug('JSON keystore: %s', self.filename)
 
     @classmethod
     def from_device(
@@ -293,7 +291,9 @@ def from_device(
 
         return cls(namespace, filename)
 
-    async def load(self):
+    async def load(
+        self,
+    ) -> tuple[dict[str, dict[str, dict[str, Any]]], dict[str, dict[str, Any]]]:
         # Try to open the file, without failing. If the file does not exist, it
         # will be created upon saving.
         try:
@@ -312,17 +312,17 @@ async def load(self):
             return next(iter(db.items()))
 
         # Finally, just create an empty key map for the namespace
-        key_map = {}
+        key_map: dict[str, dict[str, Any]] = {}
         db[self.namespace] = key_map
         return (db, key_map)
 
-    async def save(self, db):
+    async def save(self, db: dict[str, dict[str, dict[str, Any]]]) -> None:
         # Create the directory if it doesn't exist
-        if not os.path.exists(self.directory_name):
-            os.makedirs(self.directory_name, exist_ok=True)
+        if not self.directory_name.exists():
+            self.directory_name.mkdir(parents=True, exist_ok=True)
 
         # Save to a temporary file
-        temp_filename = self.filename + '.tmp'
+        temp_filename = self.filename.with_name(self.filename.name + ".tmp")
         with open(temp_filename, 'w', encoding='utf-8') as output:
             json.dump(db, output, sort_keys=True, indent=4)
 
@@ -334,16 +334,16 @@ async def delete(self, name: str) -> None:
         del key_map[name]
         await self.save(db)
 
-    async def update(self, name, keys):
+    async def update(self, name: str, keys: PairingKeys) -> None:
         db, key_map = await self.load()
         key_map.setdefault(name, {}).update(keys.to_dict())
         await self.save(db)
 
-    async def get_all(self):
+    async def get_all(self) -> list[tuple[str, PairingKeys]]:
         _, key_map = await self.load()
         return [(name, PairingKeys.from_dict(keys)) for (name, keys) in key_map.items()]
 
-    async def delete_all(self):
+    async def delete_all(self) -> None:
         db, key_map = await self.load()
         key_map.clear()
         await self.save(db)

pyproject.toml

@@ -13,7 +13,6 @@ authors = [{ name = "Google", email = "bumble-dev@google.com" }]
 requires-python = ">=3.10"
 dependencies = [
     "aiohttp ~= 3.8; platform_system!='Emscripten'",
-    "appdirs >= 1.4; platform_system!='Emscripten'",
     "click >= 8.1.3; platform_system!='Emscripten'",
     "cryptography >= 44.0.3; platform_system!='Emscripten' and platform_system!='Android'",
     # Pyodide bundles a version of cryptography that is built for wasm, which may not match the

tests/keystore_test.py

@@ -21,6 +21,7 @@
 import os
 import pathlib
 import tempfile
+from unittest import mock
 
 import pytest
 
@@ -179,11 +180,55 @@ async def test_default_namespace(temporary_file):
     assert keys.irk.value == bytes.fromhex('e7b2543b206e4e46b44f9e51dad22bd1')
 
 
+# -----------------------------------------------------------------------------
+@pytest.mark.asyncio
+async def test_no_filename(tmp_path):
+    import platformdirs
+
+    with mock.patch.object(platformdirs, 'user_data_path', return_value=tmp_path):
+        # Case 1: no namespace, no filename
+        keystore = JsonKeyStore(None, None)
+        expected_directory = tmp_path / 'Pairing'
+        expected_filename = expected_directory / 'keys.json'
+        assert keystore.directory_name == expected_directory
+        assert keystore.filename == expected_filename
+
+        # Save some data
+        keys = PairingKeys()
+        ltk = bytes([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15])
+        keys.ltk = PairingKeys.Key(ltk)
+        await keystore.update('foo', keys)
+        assert expected_filename.exists()
+
+        # Load back
+        keystore2 = JsonKeyStore(None, None)
+        foo = await keystore2.get('foo')
+        assert foo is not None
+        assert foo.ltk.value == ltk
+
+        # Case 2: namespace, no filename
+        keystore3 = JsonKeyStore('my:namespace', None)
+        # safe_name = 'my-namespace' (lower is already 'my:namespace', then replace ':' with '-')
+        expected_filename3 = expected_directory / 'my-namespace.json'
+        assert keystore3.filename == expected_filename3
+
+        # Save some data
+        await keystore3.update('bar', keys)
+        assert expected_filename3.exists()
+
+        # Load back
+        keystore4 = JsonKeyStore('my:namespace', None)
+        bar = await keystore4.get('bar')
+        assert bar is not None
+        assert bar.ltk.value == ltk
+
+
 # -----------------------------------------------------------------------------
 async def run_tests():
     await test_basic()
     await test_parsing()
     await test_default_namespace()
+    await test_no_filename()
 
 
 # -----------------------------------------------------------------------------