Changed code to support older Python versions

venv/lib/python3.11/site-packages/starlette/middleware/__init__.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+from collections.abc import Awaitable, Callable, Iterator
+from typing import Any, ParamSpec, Protocol
+
+P = ParamSpec("P")
+
+
+_Scope = Any
+_Receive = Callable[[], Awaitable[Any]]
+_Send = Callable[[Any], Awaitable[None]]
+# Since `starlette.types.ASGIApp` type differs from `ASGIApplication` from `asgiref`
+# we need to define a more permissive version of ASGIApp that doesn't cause type errors.
+_ASGIApp = Callable[[_Scope, _Receive, _Send], Awaitable[None]]
+
+
+class _MiddlewareFactory(Protocol[P]):
+    def __call__(self, app: _ASGIApp, /, *args: P.args, **kwargs: P.kwargs) -> _ASGIApp: ...  # pragma: no cover
+
+
+class Middleware:
+    def __init__(self, cls: _MiddlewareFactory[P], *args: P.args, **kwargs: P.kwargs) -> None:
+        self.cls = cls
+        self.args = args
+        self.kwargs = kwargs
+
+    def __iter__(self) -> Iterator[Any]:
+        as_tuple = (self.cls, self.args, self.kwargs)
+        return iter(as_tuple)
+
+    def __repr__(self) -> str:
+        class_name = self.__class__.__name__
+        args_strings = [f"{value!r}" for value in self.args]
+        option_strings = [f"{key}={value!r}" for key, value in self.kwargs.items()]
+        name = getattr(self.cls, "__name__", "")
+        args_repr = ", ".join([name] + args_strings + option_strings)
+        return f"{class_name}({args_repr})"