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# SPDX-FileCopyrightText: 2015 Eric Larson
#
# SPDX-License-Identifier: Apache-2.0
from __future__ import annotations
import hashlib
import os
from textwrap import dedent
from typing import IO, TYPE_CHECKING
from pip._vendor.cachecontrol.cache import BaseCache, SeparateBodyBaseCache
from pip._vendor.cachecontrol.controller import CacheController
if TYPE_CHECKING:
from datetime import datetime
from filelock import BaseFileLock
def _secure_open_write(filename: str, fmode: int) -> IO[bytes]:
# We only want to write to this file, so open it in write only mode
flags = os.O_WRONLY
# os.O_CREAT | os.O_EXCL will fail if the file already exists, so we only
# will open *new* files.
# We specify this because we want to ensure that the mode we pass is the
# mode of the file.
flags |= os.O_CREAT | os.O_EXCL
# Do not follow symlinks to prevent someone from making a symlink that
# we follow and insecurely open a cache file.
if hasattr(os, "O_NOFOLLOW"):
flags |= os.O_NOFOLLOW
# On Windows we'll mark this file as binary
if hasattr(os, "O_BINARY"):
flags |= os.O_BINARY
# Before we open our file, we want to delete any existing file that is
# there
try:
os.remove(filename)
except OSError:
# The file must not exist already, so we can just skip ahead to opening
pass
# Open our file, the use of os.O_CREAT | os.O_EXCL will ensure that if a
# race condition happens between the os.remove and this line, that an
# error will be raised. Because we utilize a lockfile this should only
# happen if someone is attempting to attack us.
fd = os.open(filename, flags, fmode)
try:
return os.fdopen(fd, "wb")
except:
# An error occurred wrapping our FD in a file object
os.close(fd)
raise
class _FileCacheMixin:
"""Shared implementation for both FileCache variants."""
def __init__(
self,
directory: str,
forever: bool = False,
filemode: int = 0o0600,
dirmode: int = 0o0700,
lock_class: type[BaseFileLock] | None = None,
) -> None:
try:
if lock_class is None:
from filelock import FileLock
lock_class = FileLock
except ImportError:
notice = dedent(
"""
NOTE: In order to use the FileCache you must have
filelock installed. You can install it via pip:
pip install filelock
"""
)
raise ImportError(notice)
self.directory = directory
self.forever = forever
self.filemode = filemode
self.dirmode = dirmode
self.lock_class = lock_class
@staticmethod
def encode(x: str) -> str:
return hashlib.sha224(x.encode()).hexdigest()
def _fn(self, name: str) -> str:
# NOTE: This method should not change as some may depend on it.
# See: https://github.com/ionrock/cachecontrol/issues/63
hashed = self.encode(name)
parts = list(hashed[:5]) + [hashed]
return os.path.join(self.directory, *parts)
def get(self, key: str) -> bytes | None:
name = self._fn(key)
try:
with open(name, "rb") as fh:
return fh.read()
except FileNotFoundError:
return None
def set(
self, key: str, value: bytes, expires: int | datetime | None = None
) -> None:
name = self._fn(key)
self._write(name, value)
def _write(self, path: str, data: bytes) -> None:
"""
Safely write the data to the given path.
"""
# Make sure the directory exists
try:
os.makedirs(os.path.dirname(path), self.dirmode)
except OSError:
pass
with self.lock_class(path + ".lock"):
# Write our actual file
with _secure_open_write(path, self.filemode) as fh:
fh.write(data)
def _delete(self, key: str, suffix: str) -> None:
name = self._fn(key) + suffix
if not self.forever:
try:
os.remove(name)
except FileNotFoundError:
pass
class FileCache(_FileCacheMixin, BaseCache):
"""
Traditional FileCache: body is stored in memory, so not suitable for large
downloads.
"""
def delete(self, key: str) -> None:
self._delete(key, "")
class SeparateBodyFileCache(_FileCacheMixin, SeparateBodyBaseCache):
"""
Memory-efficient FileCache: body is stored in a separate file, reducing
peak memory usage.
"""
def get_body(self, key: str) -> IO[bytes] | None:
name = self._fn(key) + ".body"
try:
return open(name, "rb")
except FileNotFoundError:
return None
def set_body(self, key: str, body: bytes) -> None:
name = self._fn(key) + ".body"
self._write(name, body)
def delete(self, key: str) -> None:
self._delete(key, "")
self._delete(key, ".body")
def url_to_file_path(url: str, filecache: FileCache) -> str:
"""Return the file cache path based on the URL.
This does not ensure the file exists!
"""
key = CacheController.cache_url(url)
return filecache._fn(key)