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harden: secure dynamic_imports.py #1011

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5 changes: 5 additions & 0 deletions src/openrouter/utils/dynamic_imports.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,11 +2,16 @@

from importlib import import_module
import builtins
import re
import sys

_RELATIVE_MODNAME_RE = re.compile(r"^\.[A-Za-z_][A-Za-z0-9_]*$")


def dynamic_import(package, modname, retries=3):
"""Import a module relative to package, retrying on KeyError from half-initialized modules."""
if not isinstance(modname, str) or not _RELATIVE_MODNAME_RE.match(modname):
raise ValueError(f"Refusing to import untrusted module name: {modname!r}")
for attempt in range(retries):
try:
return import_module(modname, package)
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