feat: infer chronologically likeliest setuptools version

src/macaron/build_spec_generator/common_spec/pypi_spec.py

@@ -120,6 +120,8 @@ def resolve_fields(self, purl: PackageURL) -> None:
         python_version_set: set[str] = set()
         wheel_name_python_version_list: list[str] = []
         wheel_name_platforms: set[str] = set()
+        # Precautionary fallback to default version
+        chronologically_likeliest_version: str = defaults.get("heuristic.pypi", "default_setuptools")
 
         if pypi_package_json is not None:
             if pypi_package_json.package_json or pypi_package_json.download(dest=""):
@@ -150,6 +152,9 @@ def resolve_fields(self, purl: PackageURL) -> None:
                             parsed_build_requires["setuptools"] = "==" + defaults.get(
                                 "heuristic.pypi", "setuptools_version_emitting_platform_unknown"
                             )
+                        chronologically_likeliest_version = (
+                            pypi_package_json.get_chronologically_suitable_setuptools_version()
+                        )
                 except SourceCodeError:
                     logger.debug("Could not find pure wheel matching this PURL")
 
@@ -165,6 +170,10 @@ def resolve_fields(self, purl: PackageURL) -> None:
                             requires = json_extract(content, ["build-system", "requires"], list)
                             if requires:
                                 build_requires_set.update(elem.replace(" ", "") for elem in requires)
+                            # If we cannot find [build-system] requires, we lean on the fact that setuptools
+                            # was the de-facto build tool, and infer a setuptools version to include.
+                            else:
+                                build_requires_set.add(f"setuptools=={chronologically_likeliest_version}")
                             backend = json_extract(content, ["build-system", "build-backend"], str)
                             if backend:
                                 build_backends_set.add(backend.replace(" ", ""))
@@ -177,6 +186,10 @@ def resolve_fields(self, purl: PackageURL) -> None:
                                 build_requires_set,
                                 build_backends_set,
                             )
+                            # Here we have successfully analyzed the pyproject.toml file. Now, if we have a setup.py/cfg,
+                            # we also need to infer a setuptools version to infer.
+                            if pypi_package_json.file_exists("setup.py") or pypi_package_json.file_exists("setup.cfg"):
+                                build_requires_set.add(f"setuptools=={chronologically_likeliest_version}")
                         except TypeError as error:
                             logger.debug(
                                 "Found a type error while reading the pyproject.toml file from the sdist: %s", error
@@ -185,6 +198,9 @@ def resolve_fields(self, purl: PackageURL) -> None:
                             logger.debug("Failed to read the pyproject.toml file from the sdist: %s", error)
                         except SourceCodeError as error:
                             logger.debug("No pyproject.toml found: %s", error)
+                            # Here we do not have a pyproject.toml file. Instead, we lean on the fact that setuptools
+                            # was the de-facto build tool, and infer a setuptools version to include.
+                            build_requires_set.add(f"setuptools=={chronologically_likeliest_version}")
                 except SourceCodeError as error:
                     logger.debug("No source distribution found: %s", error)
 

src/macaron/malware_analyzer/pypi_heuristics/metadata/similar_projects.py

@@ -74,9 +74,6 @@ def analyze(self, pypi_package_json: PyPIPackageJsonAsset) -> tuple[HeuristicRes
                     False,
                     pypi_package_json.pypi_registry,
                     {},
-                    "",
-                    "",
-                    "",
                     PyPIInspectorAsset("", [], {}),
                 )
                 if not adjacent_pypi_json.download(""):

src/macaron/repo_finder/repo_finder_pypi.py

@@ -59,7 +59,7 @@ def find_repo(
         if not pypi_registry:
             return "", RepoFinderInfo.PYPI_NO_REGISTRY
         pypi_asset = PyPIPackageJsonAsset(
-            purl.name, purl.version, False, pypi_registry, {}, "", "", "", PyPIInspectorAsset("", [], {})
+            purl.name, purl.version, False, pypi_registry, {}, PyPIInspectorAsset("", [], {})
         )
 
     if not pypi_asset:

src/macaron/slsa_analyzer/package_registry/pypi_registry.py

@@ -4,6 +4,7 @@
 """The module provides abstractions for the pypi package registry."""
 from __future__ import annotations
 
+import bisect
 import hashlib
 import logging
 import os
@@ -15,7 +16,7 @@
 import zipfile
 from collections.abc import Callable, Generator, Iterator
 from contextlib import contextmanager
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from datetime import datetime
 from typing import TYPE_CHECKING
 
@@ -502,6 +503,42 @@ def get_maintainer_join_date(self, username: str) -> datetime | None:
 
         return res.replace(tzinfo=None) if res else None
 
+    def get_matching_setuptools_version(self, package_release_datetime: datetime) -> str:
+        """Find the setuptools that would be "latest" for the input datetime.
+
+        Parameters
+        ----------
+        package_release_datetime: str
+            Release datetime of a package we wish to rebuild
+
+        Returns
+        -------
+            str: Matching version of setuptools
+        """
+        setuptools_endpoint = urllib.parse.urljoin(self.registry_url, "pypi/setuptools/json")
+        setuptools_json = self.download_package_json(setuptools_endpoint)
+        releases = json_extract(setuptools_json, ["releases"], dict)
+        if releases:
+            release_tuples = [
+                (version, release_info[0].get("upload_time"))
+                for version, release_info in releases.items()
+                if release_info
+            ]
+            # Cannot assume this is sorted, as releases is just a dict
+            release_tuples.sort(key=lambda x: x[1])
+            # bisect_left gives position to insert package_release_datetime to maintain order, hence we do -1
+            index = (
+                bisect.bisect_left(
+                    release_tuples, package_release_datetime, key=lambda x: datetime.strptime(x[1], "%Y-%m-%dT%H:%M:%S")
+                )
+                - 1
+            )
+            return str(release_tuples[index][0])
+        # This realistically cannot happen: it would mean we somehow are trying to rebuild
+        # for a package and version with no releases.
+        # Return default just in case.
+        return defaults.get("heuristic.pypi", "default_setuptools")
+
     @staticmethod
     def extract_attestation(attestation_data: dict) -> dict | None:
         """Extract the first attestation file from a PyPI attestation response.
@@ -618,13 +655,16 @@ class PyPIPackageJsonAsset:
     package_json: dict
 
     #: The source code temporary location name.
-    package_sourcecode_path: str
+    package_sourcecode_path: str = field(init=False)
 
     #: The wheel temporary location name.
-    wheel_path: str
+    wheel_path: str = field(init=False)
 
     #: Name of the wheel file.
-    wheel_filename: str
+    wheel_filename: str = field(init=False)
+
+    #: The datetime that the wheel was uploaded.
+    wheel_upload_time: datetime = field(init=False)
 
     #: The pypi inspector information about this package
     inspector_asset: PyPIInspectorAsset
@@ -779,6 +819,7 @@ def get_wheel_url(self, tag: str = "none-any") -> str | None:
             # Continue to getting url
             wheel_url: str = distribution.get("url") or ""
             if wheel_url:
+                self.wheel_upload_time = datetime.strptime(distribution.get("upload_time") or "", "%Y-%m-%dT%H:%M:%S")
                 try:
                     parsed_url = urllib.parse.urlparse(wheel_url)
                 except ValueError:
@@ -919,6 +960,33 @@ def get_sourcecode_file_contents(self, path: str) -> bytes:
             logger.debug(error_msg)
             raise SourceCodeError(error_msg) from read_error
 
+    def file_exists(self, path: str) -> bool:
+        """Check if a file exists in the downloaded source code.
+
+        The path can be relative to the package_sourcecode_path attribute, or an absolute path.
+
+        Parameters
+        ----------
+        path: str
+            The absolute or relative to package_sourcecode_path file path to check for.
+
+        Returns
+        -------
+            bool: Whether or not a file at path absolute or relative to package_sourcecode_path exists.
+        """
+        if not self.package_sourcecode_path:
+            # No source code files were downloaded
+            return False
+
+        if not os.path.isabs(path):
+            path = os.path.join(self.package_sourcecode_path, path)
+
+        if not os.path.exists(path):
+            # Could not find a file at that path
+            return False
+
+        return True
+
     def iter_sourcecode(self) -> Iterator[tuple[str, bytes]]:
         """
         Iterate through all source code files.
@@ -1054,6 +1122,16 @@ def get_inspector_src_preview_links(self) -> bool:
         # If all distributions were invalid and went along a 'continue' path.
         return bool(self.inspector_asset)
 
+    def get_chronologically_suitable_setuptools_version(self) -> str:
+        """Find version of setuptools that would be "latest" for this package.
+
+        Returns
+        -------
+        str
+            Chronologically likeliest setuptools version
+        """
+        return self.pypi_registry.get_matching_setuptools_version(self.wheel_upload_time)
+
 
 def find_or_create_pypi_asset(
     asset_name: str, asset_version: str | None, pypi_registry_info: PackageRegistryInfo
@@ -1091,8 +1169,6 @@ def find_or_create_pypi_asset(
         logger.debug("Failed to create PyPIPackageJson asset.")
         return None
 
-    asset = PyPIPackageJsonAsset(
-        asset_name, asset_version, False, package_registry, {}, "", "", "", PyPIInspectorAsset("", [], {})
-    )
+    asset = PyPIPackageJsonAsset(asset_name, asset_version, False, package_registry, {}, PyPIInspectorAsset("", [], {}))
     pypi_registry_info.metadata.append(asset)
     return asset

tests/malware_analyzer/pypi/test_wheel_absence.py

@@ -125,7 +125,7 @@ def test_get_inspector_src_preview_links(mock_send_head_http_raw: MagicMock) ->
     mock_send_head_http_raw.return_value = MagicMock()  # Assume valid URL for testing purposes.
 
     pypi_package_json = PyPIPackageJsonAsset(
-        package_name, version, False, pypi_registry, package_json, "", "", "", PyPIInspectorAsset("", [], {})
+        package_name, version, False, pypi_registry, package_json, PyPIInspectorAsset("", [], {})
     )
 
     assert pypi_package_json.get_inspector_src_preview_links() is True