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| """Support functions for working with wheel files. | |
| """ | |
| import logging | |
| from email.message import Message | |
| from email.parser import Parser | |
| from typing import Tuple | |
| from zipfile import BadZipFile, ZipFile | |
| from pip._vendor.packaging.utils import canonicalize_name | |
| from pip._internal.exceptions import UnsupportedWheel | |
| VERSION_COMPATIBLE = (1, 0) | |
| logger = logging.getLogger(__name__) | |
| def parse_wheel(wheel_zip: ZipFile, name: str) -> Tuple[str, Message]: | |
| """Extract information from the provided wheel, ensuring it meets basic | |
| standards. | |
| Returns the name of the .dist-info directory and the parsed WHEEL metadata. | |
| """ | |
| try: | |
| info_dir = wheel_dist_info_dir(wheel_zip, name) | |
| metadata = wheel_metadata(wheel_zip, info_dir) | |
| version = wheel_version(metadata) | |
| except UnsupportedWheel as e: | |
| raise UnsupportedWheel("{} has an invalid wheel, {}".format(name, str(e))) | |
| check_compatibility(version, name) | |
| return info_dir, metadata | |
| def wheel_dist_info_dir(source: ZipFile, name: str) -> str: | |
| """Returns the name of the contained .dist-info directory. | |
| Raises AssertionError or UnsupportedWheel if not found, >1 found, or | |
| it doesn't match the provided name. | |
| """ | |
| # Zip file path separators must be / | |
| subdirs = {p.split("/", 1)[0] for p in source.namelist()} | |
| info_dirs = [s for s in subdirs if s.endswith(".dist-info")] | |
| if not info_dirs: | |
| raise UnsupportedWheel(".dist-info directory not found") | |
| if len(info_dirs) > 1: | |
| raise UnsupportedWheel( | |
| "multiple .dist-info directories found: {}".format(", ".join(info_dirs)) | |
| ) | |
| info_dir = info_dirs[0] | |
| info_dir_name = canonicalize_name(info_dir) | |
| canonical_name = canonicalize_name(name) | |
| if not info_dir_name.startswith(canonical_name): | |
| raise UnsupportedWheel( | |
| ".dist-info directory {!r} does not start with {!r}".format( | |
| info_dir, canonical_name | |
| ) | |
| ) | |
| return info_dir | |
| def read_wheel_metadata_file(source: ZipFile, path: str) -> bytes: | |
| try: | |
| return source.read(path) | |
| # BadZipFile for general corruption, KeyError for missing entry, | |
| # and RuntimeError for password-protected files | |
| except (BadZipFile, KeyError, RuntimeError) as e: | |
| raise UnsupportedWheel(f"could not read {path!r} file: {e!r}") | |
| def wheel_metadata(source: ZipFile, dist_info_dir: str) -> Message: | |
| """Return the WHEEL metadata of an extracted wheel, if possible. | |
| Otherwise, raise UnsupportedWheel. | |
| """ | |
| path = f"{dist_info_dir}/WHEEL" | |
| # Zip file path separators must be / | |
| wheel_contents = read_wheel_metadata_file(source, path) | |
| try: | |
| wheel_text = wheel_contents.decode() | |
| except UnicodeDecodeError as e: | |
| raise UnsupportedWheel(f"error decoding {path!r}: {e!r}") | |
| # FeedParser (used by Parser) does not raise any exceptions. The returned | |
| # message may have .defects populated, but for backwards-compatibility we | |
| # currently ignore them. | |
| return Parser().parsestr(wheel_text) | |
| def wheel_version(wheel_data: Message) -> Tuple[int, ...]: | |
| """Given WHEEL metadata, return the parsed Wheel-Version. | |
| Otherwise, raise UnsupportedWheel. | |
| """ | |
| version_text = wheel_data["Wheel-Version"] | |
| if version_text is None: | |
| raise UnsupportedWheel("WHEEL is missing Wheel-Version") | |
| version = version_text.strip() | |
| try: | |
| return tuple(map(int, version.split("."))) | |
| except ValueError: | |
| raise UnsupportedWheel(f"invalid Wheel-Version: {version!r}") | |
| def check_compatibility(version: Tuple[int, ...], name: str) -> None: | |
| """Raises errors or warns if called with an incompatible Wheel-Version. | |
| pip should refuse to install a Wheel-Version that's a major series | |
| ahead of what it's compatible with (e.g 2.0 > 1.1); and warn when | |
| installing a version only minor version ahead (e.g 1.2 > 1.1). | |
| version: a 2-tuple representing a Wheel-Version (Major, Minor) | |
| name: name of wheel or package to raise exception about | |
| :raises UnsupportedWheel: when an incompatible Wheel-Version is given | |
| """ | |
| if version[0] > VERSION_COMPATIBLE[0]: | |
| raise UnsupportedWheel( | |
| "{}'s Wheel-Version ({}) is not compatible with this version " | |
| "of pip".format(name, ".".join(map(str, version))) | |
| ) | |
| elif version > VERSION_COMPATIBLE: | |
| logger.warning( | |
| "Installing from a newer Wheel-Version (%s)", | |
| ".".join(map(str, version)), | |
| ) | |