mirror of
https://github.com/GNS3/gns3-server
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427 lines
16 KiB
Python
427 lines
16 KiB
Python
#!/usr/bin/env python
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#
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# Copyright (C) 2019 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Iterable ZIP archive generator.
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Derived directly from zipfile.py and the zipstream project
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https://github.com/allanlei/python-zipstream
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"""
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import os
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import sys
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import stat
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import struct
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import time
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import zipfile
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import asyncio
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import aiofiles
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from concurrent import futures
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from zipfile import (structCentralDir, structEndArchive64, structEndArchive, structEndArchive64Locator,
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stringCentralDir, stringEndArchive64, stringEndArchive, stringEndArchive64Locator)
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stringDataDescriptor = b'PK\x07\x08' # magic number for data descriptor
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def _get_compressor(compress_type):
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"""
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Return the compressor.
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"""
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if compress_type == zipfile.ZIP_DEFLATED:
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from zipfile import zlib
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return zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15)
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elif compress_type == zipfile.ZIP_BZIP2:
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from zipfile import bz2
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return bz2.BZ2Compressor()
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elif compress_type == zipfile.ZIP_LZMA:
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from zipfile import LZMACompressor
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return LZMACompressor()
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else:
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return None
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class PointerIO(object):
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def __init__(self, mode='wb'):
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if mode not in ('wb', ):
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raise RuntimeError('zipstream.ZipFile() requires mode "wb"')
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self.data_pointer = 0
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self.__mode = mode
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self.__closed = False
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@property
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def mode(self):
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return self.__mode
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@property
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def closed(self):
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return self.__closed
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def close(self):
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self.__closed = True
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def flush(self):
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pass
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def next(self):
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raise NotImplementedError()
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def tell(self):
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return self.data_pointer
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def truncate(size=None):
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raise NotImplementedError()
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def write(self, data):
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if self.closed:
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raise ValueError('I/O operation on closed file')
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if isinstance(data, str):
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data = data.encode('utf-8')
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if not isinstance(data, bytes):
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raise TypeError('expected bytes')
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self.data_pointer += len(data)
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return data
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class ZipInfo(zipfile.ZipInfo):
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def __init__(self, *args, **kwargs):
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zipfile.ZipInfo.__init__(self, *args, **kwargs)
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def DataDescriptor(self):
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"""
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crc-32 4 bytes
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compressed size 4 bytes
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uncompressed size 4 bytes
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"""
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if self.compress_size > zipfile.ZIP64_LIMIT or self.file_size > zipfile.ZIP64_LIMIT:
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fmt = b'<4sLQQ'
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else:
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fmt = b'<4sLLL'
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return struct.pack(fmt, stringDataDescriptor, self.CRC, self.compress_size, self.file_size)
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class ZipFile(zipfile.ZipFile):
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def __init__(self, fileobj=None, mode='w', compression=zipfile.ZIP_STORED, allowZip64=True, chunksize=32768):
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"""Open the ZIP file with mode write "w"."""
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if mode not in ('w', ):
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raise RuntimeError('aiozipstream.ZipFile() requires mode "w"')
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if fileobj is None:
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fileobj = PointerIO()
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self._comment = b''
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zipfile.ZipFile.__init__(self, fileobj, mode=mode, compression=compression, allowZip64=allowZip64)
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self._chunksize = chunksize
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self.paths_to_write = []
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def __aiter__(self):
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return self._stream()
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@property
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def comment(self):
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"""
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The comment text associated with the ZIP file.
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"""
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return self._comment
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@comment.setter
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def comment(self, comment):
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"""
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Add a comment text associated with the ZIP file.
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"""
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if not isinstance(comment, bytes):
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raise TypeError("comment: expected bytes, got %s" % type(comment))
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# check for valid comment length
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if len(comment) >= zipfile.ZIP_MAX_COMMENT:
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if self.debug:
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print('Archive comment is too long; truncating to %d bytes' % zipfile.ZIP_MAX_COMMENT)
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comment = comment[:zipfile.ZIP_MAX_COMMENT]
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self._comment = comment
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self._didModify = True
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async def data_generator(self, path):
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async with aiofiles.open(path, "rb") as f:
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while True:
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part = await f.read(self._chunksize)
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if not part:
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break
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yield part
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return
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async def _run_in_executor(self, task, *args, **kwargs):
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"""
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Run synchronous task in separate thread and await for result.
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"""
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loop = asyncio.get_event_loop()
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return await loop.run_in_executor(futures.ThreadPoolExecutor(max_workers=1), task, *args, **kwargs)
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async def _stream(self):
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for kwargs in self.paths_to_write:
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async for chunk in self._write(**kwargs):
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yield chunk
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for chunk in self._close():
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yield chunk
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def write(self, filename, arcname=None, compress_type=None):
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"""
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Write a file to the archive under the name `arcname`.
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"""
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kwargs = {'filename': filename, 'arcname': arcname, 'compress_type': compress_type}
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self.paths_to_write.append(kwargs)
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def write_iter(self, arcname, iterable, compress_type=None):
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"""
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Write the bytes iterable `iterable` to the archive under the name `arcname`.
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"""
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kwargs = {'arcname': arcname, 'iterable': iterable, 'compress_type': compress_type}
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self.paths_to_write.append(kwargs)
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def writestr(self, arcname, data, compress_type=None):
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"""
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Writes a str into ZipFile by wrapping data as a generator
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"""
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def _iterable():
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yield data
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return self.write_iter(arcname, _iterable(), compress_type=compress_type)
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async def _write(self, filename=None, iterable=None, arcname=None, compress_type=None):
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"""
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Put the bytes from filename into the archive under the name `arcname`.
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"""
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if not self.fp:
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raise RuntimeError(
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"Attempt to write to ZIP archive that was already closed")
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if (filename is None and iterable is None) or (filename is not None and iterable is not None):
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raise ValueError("either (exclusively) filename or iterable shall be not None")
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if filename:
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st = os.stat(filename)
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isdir = stat.S_ISDIR(st.st_mode)
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mtime = time.localtime(st.st_mtime)
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date_time = mtime[0:6]
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else:
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st, isdir, date_time = None, False, time.localtime()[0:6]
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# Create ZipInfo instance to store file information
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if arcname is None:
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arcname = filename
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arcname = os.path.normpath(os.path.splitdrive(arcname)[1])
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while arcname[0] in (os.sep, os.altsep):
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arcname = arcname[1:]
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if isdir:
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arcname += '/'
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zinfo = ZipInfo(arcname, date_time)
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if st:
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zinfo.external_attr = (st[0] & 0xFFFF) << 16 # Unix attributes
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else:
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zinfo.external_attr = 0o600 << 16 # ?rw-------
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if compress_type is None:
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zinfo.compress_type = self.compression
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else:
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zinfo.compress_type = compress_type
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if st:
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zinfo.file_size = st[6]
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else:
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zinfo.file_size = 0
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zinfo.flag_bits = 0x00
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zinfo.flag_bits |= 0x08 # ZIP flag bits, bit 3 indicates presence of data descriptor
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zinfo.header_offset = self.fp.tell() # Start of header bytes
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if zinfo.compress_type == zipfile.ZIP_LZMA:
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# Compressed data includes an end-of-stream (EOS) marker
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zinfo.flag_bits |= 0x02
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self._writecheck(zinfo)
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self._didModify = True
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if isdir:
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zinfo.file_size = 0
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zinfo.compress_size = 0
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zinfo.CRC = 0
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self.filelist.append(zinfo)
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self.NameToInfo[zinfo.filename] = zinfo
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yield self.fp.write(zinfo.FileHeader(False))
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return
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cmpr = _get_compressor(zinfo.compress_type)
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# Must overwrite CRC and sizes with correct data later
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zinfo.CRC = CRC = 0
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zinfo.compress_size = compress_size = 0
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# Compressed size can be larger than uncompressed size
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zip64 = self._allowZip64 and zinfo.file_size * 1.05 > zipfile.ZIP64_LIMIT
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yield self.fp.write(zinfo.FileHeader(zip64))
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file_size = 0
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if filename:
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async for buf in self.data_generator(filename):
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file_size = file_size + len(buf)
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CRC = zipfile.crc32(buf, CRC) & 0xffffffff
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if cmpr:
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buf = await self._run_in_executor(cmpr.compress, buf)
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compress_size = compress_size + len(buf)
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yield self.fp.write(buf)
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else: # we have an iterable
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for buf in iterable:
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file_size = file_size + len(buf)
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CRC = zipfile.crc32(buf, CRC) & 0xffffffff
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if cmpr:
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buf = await self._run_in_executor(cmpr.compress, buf)
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compress_size = compress_size + len(buf)
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yield self.fp.write(buf)
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if cmpr:
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buf = cmpr.flush()
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compress_size = compress_size + len(buf)
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yield self.fp.write(buf)
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zinfo.compress_size = compress_size
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else:
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zinfo.compress_size = file_size
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zinfo.CRC = CRC
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zinfo.file_size = file_size
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if not zip64 and self._allowZip64:
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if file_size > zipfile.ZIP64_LIMIT:
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raise RuntimeError('File size has increased during compressing')
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if compress_size > zipfile.ZIP64_LIMIT:
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raise RuntimeError('Compressed size larger than uncompressed size')
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yield self.fp.write(zinfo.DataDescriptor())
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self.filelist.append(zinfo)
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self.NameToInfo[zinfo.filename] = zinfo
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def _close(self):
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"""
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Close the file, and for mode "w" write the ending records.
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"""
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if self.fp is None:
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return
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try:
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if self.mode in ('w', 'a') and self._didModify: # write ending records
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count = 0
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pos1 = self.fp.tell()
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for zinfo in self.filelist: # write central directory
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count = count + 1
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dt = zinfo.date_time
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dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
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dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
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extra = []
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if zinfo.file_size > zipfile.ZIP64_LIMIT or zinfo.compress_size > zipfile.ZIP64_LIMIT:
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extra.append(zinfo.file_size)
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extra.append(zinfo.compress_size)
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file_size = 0xffffffff
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compress_size = 0xffffffff
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else:
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file_size = zinfo.file_size
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compress_size = zinfo.compress_size
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if zinfo.header_offset > zipfile.ZIP64_LIMIT:
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extra.append(zinfo.header_offset)
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header_offset = 0xffffffff
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else:
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header_offset = zinfo.header_offset
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extra_data = zinfo.extra
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min_version = 0
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if extra:
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# Append a ZIP64 field to the extra's
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extra_data = struct.pack(
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b'<HH' + b'Q'*len(extra),
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1, 8*len(extra), *extra) + extra_data
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min_version = zipfile.ZIP64_VERSION
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if zinfo.compress_type == zipfile.ZIP_BZIP2:
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min_version = max(zipfile.BZIP2_VERSION, min_version)
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elif zinfo.compress_type == zipfile.ZIP_LZMA:
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min_version = max(zipfile.LZMA_VERSION, min_version)
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extract_version = max(min_version, zinfo.extract_version)
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create_version = max(min_version, zinfo.create_version)
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try:
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filename, flag_bits = zinfo._encodeFilenameFlags()
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centdir = struct.pack(structCentralDir,
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stringCentralDir, create_version,
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zinfo.create_system, extract_version, zinfo.reserved,
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flag_bits, zinfo.compress_type, dostime, dosdate,
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zinfo.CRC, compress_size, file_size,
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len(filename), len(extra_data), len(zinfo.comment),
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0, zinfo.internal_attr, zinfo.external_attr,
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header_offset)
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except DeprecationWarning:
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print((structCentralDir, stringCentralDir, create_version,
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zinfo.create_system, extract_version, zinfo.reserved,
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zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
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zinfo.CRC, compress_size, file_size,
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len(zinfo.filename), len(extra_data), len(zinfo.comment),
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0, zinfo.internal_attr, zinfo.external_attr,
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header_offset), file=sys.stderr)
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raise
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yield self.fp.write(centdir)
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yield self.fp.write(filename)
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yield self.fp.write(extra_data)
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yield self.fp.write(zinfo.comment)
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pos2 = self.fp.tell()
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# Write end-of-zip-archive record
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centDirCount = count
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centDirSize = pos2 - pos1
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centDirOffset = pos1
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if (centDirCount >= zipfile.ZIP_FILECOUNT_LIMIT or
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centDirOffset > zipfile.ZIP64_LIMIT or
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centDirSize > zipfile.ZIP64_LIMIT):
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# Need to write the ZIP64 end-of-archive records
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zip64endrec = struct.pack(
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structEndArchive64, stringEndArchive64,
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44, 45, 45, 0, 0, centDirCount, centDirCount,
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centDirSize, centDirOffset)
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yield self.fp.write(zip64endrec)
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zip64locrec = struct.pack(
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structEndArchive64Locator,
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stringEndArchive64Locator, 0, pos2, 1)
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yield self.fp.write(zip64locrec)
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centDirCount = min(centDirCount, 0xFFFF)
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centDirSize = min(centDirSize, 0xFFFFFFFF)
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centDirOffset = min(centDirOffset, 0xFFFFFFFF)
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endrec = struct.pack(structEndArchive, stringEndArchive,
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0, 0, centDirCount, centDirCount,
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centDirSize, centDirOffset, len(self._comment))
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yield self.fp.write(endrec)
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yield self.fp.write(self._comment)
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self.fp.flush()
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finally:
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fp = self.fp
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self.fp = None
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if not self._filePassed:
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fp.close()
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