fix some errors reported by mypy

src/allmydata/crypto/rsa.py

@@ -13,7 +13,7 @@ on any of their methods.
 
 from __future__ import annotations
 
-from typing import TypeVar
+from typing_extensions import TypeAlias
 
 from cryptography.exceptions import InvalidSignature
 from cryptography.hazmat.backends import default_backend
@@ -24,8 +24,8 @@ from cryptography.hazmat.primitives.serialization import load_der_private_key, l
 
 from allmydata.crypto.error import BadSignature
 
-PublicKey = TypeVar("PublicKey", bound=rsa.RSAPublicKey)
-PrivateKey = TypeVar("PrivateKey", bound=rsa.RSAPrivateKey)
+PublicKey: TypeAlias = rsa.RSAPublicKey
+PrivateKey: TypeAlias = rsa.RSAPrivateKey
 
 # This is the value that was used by `pycryptopp`, and we must continue to use it for
 # both backwards compatibility and interoperability.

src/allmydata/mutable/common.py

@@ -66,7 +66,7 @@ class UnknownVersionError(BadShareError):
     """The share we received was of a version we don't recognize."""
 
 
-def encrypt_privkey(writekey: bytes, privkey: rsa.PrivateKey) -> bytes:
+def encrypt_privkey(writekey: bytes, privkey: bytes) -> bytes:
     """
     For SSK, encrypt a private ("signature") key using the writekey.
     """

src/allmydata/test/cli/test_put.py

@@ -3,7 +3,7 @@ Tests for the ``tahoe put`` CLI tool.
 """
 from __future__ import annotations
 
-from typing import Callable, Awaitable, TypeVar
+from typing import Callable, Awaitable, TypeVar, Any
 import os.path
 from twisted.trial import unittest
 from twisted.python import usage
@@ -242,7 +242,7 @@ class Put(GridTestMixin, CLITestMixin, unittest.TestCase):
 
     async def _test_mutable_specified_key(
             self,
-            run: Callable[[Callable[..., T], FilePath, FilePath], Awaitable[T]],
+            run: Callable[[Any, FilePath, FilePath], Awaitable[tuple[int, bytes, bytes]]],
     ) -> None:
         """
         A helper for testing mutable creation.

src/allmydata/test/common.py

@@ -635,7 +635,7 @@ class FakeMutableFileNode(object):  # type: ignore # incomplete implementation
                  keypair: tuple[rsa.PublicKey, rsa.PrivateKey] | None
                 ):
         self.all_contents = all_contents
-        self.file_types = {} # storage index => MDMF_VERSION or SDMF_VERSION
+        self.file_types: dict[bytes, int] = {} # storage index => MDMF_VERSION or SDMF_VERSION
         self.init_from_cap(make_mutable_file_cap(keypair))
         self._k = default_encoding_parameters['k']
         self._segsize = default_encoding_parameters['max_segment_size']

src/allmydata/test/web/test_web.py

@@ -90,6 +90,7 @@ class FakeNodeMaker(NodeMaker):
         'happy': 7,
         'max_segment_size':128*1024 # 1024=KiB
     }
+    all_contents: dict[bytes, object]
     def _create_lit(self, cap):
         return FakeCHKFileNode(cap, self.all_contents)
     def _create_immutable(self, cap):

src/allmydata/web/common.py

@@ -6,7 +6,7 @@ from __future__ import annotations
 from six import ensure_str
 
 try:
-    from typing import Optional, Union, Tuple, Any
+    from typing import Optional, Union, Tuple, Any, TypeVar
 except ImportError:
     pass
 
@@ -706,8 +706,9 @@ def url_for_string(req, url_string):
         )
     return url
 
+T = TypeVar("T")
 
-def get_arg(req, argname, default=None, multiple=False):  # type: (IRequest, Union[bytes,str], Any, bool) -> Union[bytes,Tuple[bytes],Any]
+def get_arg(req: IRequest, argname: str | bytes, default: T = None, multiple: bool = False) -> Union[bytes, tuple[bytes, ...], T]:
     """Extract an argument from either the query args (req.args) or the form
     body fields (req.fields). If multiple=False, this returns a single value
     (or the default, which defaults to None), and the query args take
@@ -719,13 +720,17 @@ def get_arg(req, argname, default=None, multiple=False):  # type: (IRequest, Uni
     :return: Either bytes or tuple of bytes.
     """
     if isinstance(argname, str):
-        argname = argname.encode("utf-8")
+        argname_bytes = argname.encode("utf-8")
+    else:
+        argname_bytes = argname
+
     if isinstance(default, str):
         default = default.encode("utf-8")
+
     results = []
-    if argname in req.args:
-        results.extend(req.args[argname])
-    argname_unicode = str(argname, "utf-8")
+    if argname_bytes in req.args:
+        results.extend(req.args[argname_bytes])
+    argname_unicode = str(argname_bytes, "utf-8")
     if req.fields and argname_unicode in req.fields:
         value = req.fields[argname_unicode].value
         if isinstance(value, str):
@@ -832,7 +837,7 @@ def get_keypair(request: IRequest) -> tuple[PublicKey, PrivateKey] | None:
     Load a keypair from a urlsafe-base64-encoded RSA private key in the
     **private-key** argument of the given request, if there is one.
     """
-    privkey_der = get_arg(request, "private-key", None)
+    privkey_der = get_arg(request, "private-key", default=None, multiple=False)
     if privkey_der is None:
         return None
     privkey, pubkey = create_signing_keypair_from_string(urlsafe_b64decode(privkey_der))