218 lines
6.4 KiB
Python
218 lines
6.4 KiB
Python
# -*- test-case-name: twisted.test.test_paths.ZipFilePathTestCase -*-
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"""
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This module contains partial re-implementations of FilePath, pending some
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specification of formal interfaces it is a duck-typing attempt to emulate them
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for certain restricted uses.
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See the constructor for ZipArchive for use.
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"""
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__metaclass__ = type
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import os
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import time
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import errno
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from twisted.python.zipstream import ChunkingZipFile
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from twisted.python.filepath import FilePath, _PathHelper
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# using FilePath here exclusively rather than os to make sure that we don't do
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# anything OS-path-specific here.
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ZIP_PATH_SEP = '/' # In zipfiles, "/" is universally used as the
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# path separator, regardless of platform.
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class ZipPath(_PathHelper):
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"""
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I represent a file or directory contained within a zip file.
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"""
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def __init__(self, archive, pathInArchive):
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"""
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Don't construct me directly. Use ZipArchive.child().
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@param archive: a ZipArchive instance.
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@param pathInArchive: a ZIP_PATH_SEP-separated string.
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"""
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self.archive = archive
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self.pathInArchive = pathInArchive
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# self.path pretends to be os-specific because that's the way the
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# 'zipimport' module does it.
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self.path = os.path.join(archive.zipfile.filename,
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*(self.pathInArchive.split(ZIP_PATH_SEP)))
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def __cmp__(self, other):
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if not isinstance(other, ZipPath):
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return NotImplemented
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return cmp((self.archive, self.pathInArchive),
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(other.archive, other.pathInArchive))
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def __repr__(self):
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return 'ZipPath(%r)' % (os.path.abspath(self.path),)
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def parent(self):
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splitup = self.pathInArchive.split(ZIP_PATH_SEP)
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if len(splitup) == 1:
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return self.archive
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return ZipPath(self.archive, ZIP_PATH_SEP.join(splitup[:-1]))
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def child(self, path):
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return ZipPath(self.archive, ZIP_PATH_SEP.join([self.pathInArchive, path]))
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def sibling(self, path):
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return self.parent().child(path)
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# preauthChild = child
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def exists(self):
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return self.isdir() or self.isfile()
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def isdir(self):
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return self.pathInArchive in self.archive.childmap
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def isfile(self):
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return self.pathInArchive in self.archive.zipfile.NameToInfo
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def islink(self):
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return False
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def listdir(self):
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if self.exists():
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if self.isdir():
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return self.archive.childmap[self.pathInArchive].keys()
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else:
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raise OSError(errno.ENOTDIR, "Leaf zip entry listed")
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else:
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raise OSError(errno.ENOENT, "Non-existent zip entry listed")
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def splitext(self):
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"""
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Return a value similar to that returned by os.path.splitext.
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"""
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# This happens to work out because of the fact that we use OS-specific
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# path separators in the constructor to construct our fake 'path'
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# attribute.
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return os.path.splitext(self.path)
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def basename(self):
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return self.pathInArchive.split(ZIP_PATH_SEP)[-1]
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def dirname(self):
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# XXX NOTE: This API isn't a very good idea on filepath, but it's even
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# less meaningful here.
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return self.parent().path
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def open(self):
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return self.archive.zipfile.readfile(self.pathInArchive)
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def restat(self):
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pass
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def getAccessTime(self):
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"""
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Retrieve this file's last access-time. This is the same as the last access
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time for the archive.
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@return: a number of seconds since the epoch
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"""
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return self.archive.getAccessTime()
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def getModificationTime(self):
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"""
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Retrieve this file's last modification time. This is the time of
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modification recorded in the zipfile.
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@return: a number of seconds since the epoch.
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"""
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return time.mktime(
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self.archive.zipfile.NameToInfo[self.pathInArchive].date_time
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+ (0, 0, 0))
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def getStatusChangeTime(self):
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"""
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Retrieve this file's last modification time. This name is provided for
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compatibility, and returns the same value as getmtime.
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@return: a number of seconds since the epoch.
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"""
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return self.getModificationTime()
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class ZipArchive(ZipPath):
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""" I am a FilePath-like object which can wrap a zip archive as if it were a
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directory.
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"""
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archive = property(lambda self: self)
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def __init__(self, archivePathname):
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"""Create a ZipArchive, treating the archive at archivePathname as a zip file.
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@param archivePathname: a str, naming a path in the filesystem.
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"""
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self.zipfile = ChunkingZipFile(archivePathname)
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self.path = archivePathname
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self.pathInArchive = ''
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# zipfile is already wasting O(N) memory on cached ZipInfo instances,
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# so there's no sense in trying to do this lazily or intelligently
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self.childmap = {} # map parent: list of children
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for name in self.zipfile.namelist():
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name = name.split(ZIP_PATH_SEP)
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for x in range(len(name)):
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child = name[-x]
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parent = ZIP_PATH_SEP.join(name[:-x])
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if parent not in self.childmap:
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self.childmap[parent] = {}
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self.childmap[parent][child] = 1
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parent = ''
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def child(self, path):
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"""
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Create a ZipPath pointing at a path within the archive.
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@param path: a str with no path separators in it, either '/' or the
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system path separator, if it's different.
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"""
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return ZipPath(self, path)
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def exists(self):
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"""
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Returns true if the underlying archive exists.
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"""
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return FilePath(self.zipfile.filename).exists()
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def getAccessTime(self):
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"""
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Return the archive file's last access time.
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"""
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return FilePath(self.zipfile.filename).getAccessTime()
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def getModificationTime(self):
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"""
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Return the archive file's modification time.
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"""
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return FilePath(self.zipfile.filename).getModificationTime()
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def getStatusChangeTime(self):
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"""
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Return the archive file's status change time.
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"""
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return FilePath(self.zipfile.filename).getStatusChangeTime()
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def __repr__(self):
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return 'ZipArchive(%r)' % (os.path.abspath(self.path),)
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