CasperSecurity
# -*- test-case-name: twisted.python.test.test_zippath -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
This module contains implementations of L{IFilePath} for zip files.
See the constructor of L{ZipArchive} for use.
"""
import errno
import os
import time
from typing import Dict
from zipfile import ZipFile
from zope.interface import implementer
from twisted.python.compat import cmp, comparable
from twisted.python.filepath import (
AbstractFilePath,
FilePath,
IFilePath,
UnlistableError,
_coerceToFilesystemEncoding,
)
ZIP_PATH_SEP = "/" # In zipfiles, "/" is universally used as the
# path separator, regardless of platform.
@comparable
@implementer(IFilePath)
class ZipPath(AbstractFilePath):
"""
I represent a file or directory contained within a zip file.
"""
def __init__(self, archive, pathInArchive):
"""
Don't construct me directly. Use C{ZipArchive.child()}.
@param archive: a L{ZipArchive} instance.
@param pathInArchive: a ZIP_PATH_SEP-separated string.
"""
self.archive = archive
self.pathInArchive = pathInArchive
# self.path pretends to be os-specific because that's the way the
# 'zipimport' module does it.
sep = _coerceToFilesystemEncoding(pathInArchive, ZIP_PATH_SEP)
archiveFilename = _coerceToFilesystemEncoding(
pathInArchive, archive.zipfile.filename
)
self.path = os.path.join(archiveFilename, *(self.pathInArchive.split(sep)))
def __cmp__(self, other):
if not isinstance(other, ZipPath):
return NotImplemented
return cmp(
(self.archive, self.pathInArchive), (other.archive, other.pathInArchive)
)
def __repr__(self) -> str:
parts = [
_coerceToFilesystemEncoding(self.sep, os.path.abspath(self.archive.path))
]
parts.extend(self.pathInArchive.split(self.sep))
ossep = _coerceToFilesystemEncoding(self.sep, os.sep)
return f"ZipPath({ossep.join(parts)!r})"
@property
def sep(self):
"""
Return a zip directory separator.
@return: The zip directory separator.
@returntype: The same type as C{self.path}.
"""
return _coerceToFilesystemEncoding(self.path, ZIP_PATH_SEP)
def parent(self):
splitup = self.pathInArchive.split(self.sep)
if len(splitup) == 1:
return self.archive
return ZipPath(self.archive, self.sep.join(splitup[:-1]))
def child(self, path):
"""
Return a new ZipPath representing a path in C{self.archive} which is
a child of this path.
@note: Requesting the C{".."} (or other special name) child will not
cause L{InsecurePath} to be raised since these names do not have
any special meaning inside a zip archive. Be particularly
careful with the C{path} attribute (if you absolutely must use
it) as this means it may include special names with special
meaning outside of the context of a zip archive.
"""
joiner = _coerceToFilesystemEncoding(path, ZIP_PATH_SEP)
pathInArchive = _coerceToFilesystemEncoding(path, self.pathInArchive)
return ZipPath(self.archive, joiner.join([pathInArchive, path]))
def sibling(self, path):
return self.parent().child(path)
def exists(self):
return self.isdir() or self.isfile()
def isdir(self):
return self.pathInArchive in self.archive.childmap
def isfile(self):
return self.pathInArchive in self.archive.zipfile.NameToInfo
def islink(self):
return False
def listdir(self):
if self.exists():
if self.isdir():
return list(self.archive.childmap[self.pathInArchive].keys())
else:
raise UnlistableError(OSError(errno.ENOTDIR, "Leaf zip entry listed"))
else:
raise UnlistableError(
OSError(errno.ENOENT, "Non-existent zip entry listed")
)
def splitext(self):
"""
Return a value similar to that returned by C{os.path.splitext}.
"""
# This happens to work out because of the fact that we use OS-specific
# path separators in the constructor to construct our fake 'path'
# attribute.
return os.path.splitext(self.path)
def basename(self):
return self.pathInArchive.split(self.sep)[-1]
def dirname(self):
# XXX NOTE: This API isn't a very good idea on filepath, but it's even
# less meaningful here.
return self.parent().path
def open(self, mode="r"):
pathInArchive = _coerceToFilesystemEncoding("", self.pathInArchive)
return self.archive.zipfile.open(pathInArchive, mode=mode)
def changed(self):
pass
def getsize(self):
"""
Retrieve this file's size.
@return: file size, in bytes
"""
pathInArchive = _coerceToFilesystemEncoding("", self.pathInArchive)
return self.archive.zipfile.NameToInfo[pathInArchive].file_size
def getAccessTime(self):
"""
Retrieve this file's last access-time. This is the same as the last access
time for the archive.
@return: a number of seconds since the epoch
"""
return self.archive.getAccessTime()
def getModificationTime(self):
"""
Retrieve this file's last modification time. This is the time of
modification recorded in the zipfile.
@return: a number of seconds since the epoch.
"""
pathInArchive = _coerceToFilesystemEncoding("", self.pathInArchive)
return time.mktime(
self.archive.zipfile.NameToInfo[pathInArchive].date_time + (0, 0, 0)
)
def getStatusChangeTime(self):
"""
Retrieve this file's last modification time. This name is provided for
compatibility, and returns the same value as getmtime.
@return: a number of seconds since the epoch.
"""
return self.getModificationTime()
class ZipArchive(ZipPath):
"""
I am a L{FilePath}-like object which can wrap a zip archive as if it were a
directory.
It works similarly to L{FilePath} in L{bytes} and L{unicode} handling --
instantiating with a L{bytes} will return a "bytes mode" L{ZipArchive},
and instantiating with a L{unicode} will return a "text mode"
L{ZipArchive}. Methods that return new L{ZipArchive} or L{ZipPath}
instances will be in the mode of the argument to the creator method,
converting if required.
"""
@property
def archive(self):
return self
def __init__(self, archivePathname):
"""
Create a ZipArchive, treating the archive at archivePathname as a zip
file.
@param archivePathname: a L{bytes} or L{unicode}, naming a path in the
filesystem.
"""
self.path = archivePathname
self.zipfile = ZipFile(_coerceToFilesystemEncoding("", archivePathname))
self.pathInArchive = _coerceToFilesystemEncoding(archivePathname, "")
# zipfile is already wasting O(N) memory on cached ZipInfo instances,
# so there's no sense in trying to do this lazily or intelligently
self.childmap: Dict[str, Dict[str, int]] = {}
for name in self.zipfile.namelist():
name = _coerceToFilesystemEncoding(self.path, name).split(self.sep)
for x in range(len(name)):
child = name[-x]
parent = self.sep.join(name[:-x])
if parent not in self.childmap:
self.childmap[parent] = {}
self.childmap[parent][child] = 1
parent = _coerceToFilesystemEncoding(archivePathname, "")
def child(self, path):
"""
Create a ZipPath pointing at a path within the archive.
@param path: a L{bytes} or L{unicode} with no path separators in it
(either '/' or the system path separator, if it's different).
"""
return ZipPath(self, path)
def exists(self):
"""
Returns C{True} if the underlying archive exists.
"""
return FilePath(self.zipfile.filename).exists()
def getAccessTime(self):
"""
Return the archive file's last access time.
"""
return FilePath(self.zipfile.filename).getAccessTime()
def getModificationTime(self):
"""
Return the archive file's modification time.
"""
return FilePath(self.zipfile.filename).getModificationTime()
def getStatusChangeTime(self):
"""
Return the archive file's status change time.
"""
return FilePath(self.zipfile.filename).getStatusChangeTime()
def __repr__(self) -> str:
return f"ZipArchive({os.path.abspath(self.path)!r})"
__all__ = ["ZipArchive", "ZipPath"]