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""" This module contains implementations of L{IFilePath} for zip files. See the constructor of L{ZipArchive} for use. """ from __future__ import absolute_import, division import os import time import errno from zipfile import ZipFile from twisted.python.compat import comparable, cmp from twisted.python.filepath import IFilePath, FilePath, AbstractFilePath from twisted.python.filepath import _coerceToFilesystemEncoding from twisted.python.filepath import UnlistableError from zope.interface import implementer 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): parts = [_coerceToFilesystemEncoding( self.sep, os.path.abspath(self.archive.path))] parts.extend(self.pathInArchive.split(self.sep)) ossep = _coerceToFilesystemEncoding(self.sep, os.sep) return "ZipPath(%r)" % (ossep.join(parts),) @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. """ archive = property(lambda self: 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 = {} # map parent: list of children 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): return 'ZipArchive(%r)' % (os.path.abspath(self.path),) __all__ = ['ZipArchive', 'ZipPath']