mirror of
https://github.com/GNS3/gns3-server.git
synced 2024-12-30 01:28:56 +00:00
431 lines
16 KiB
Python
431 lines
16 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Copyright (C) 2019 GNS3 Technologies Inc.
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
"""
|
|
Iterable ZIP archive generator.
|
|
|
|
Derived directly from zipfile.py and the zipstream project
|
|
https://github.com/allanlei/python-zipstream
|
|
"""
|
|
|
|
import os
|
|
import sys
|
|
import stat
|
|
import struct
|
|
import time
|
|
import zipfile
|
|
import asyncio
|
|
import aiofiles
|
|
from concurrent import futures
|
|
from async_generator import async_generator, yield_
|
|
|
|
from zipfile import (structCentralDir, structEndArchive64, structEndArchive, structEndArchive64Locator,
|
|
stringCentralDir, stringEndArchive64, stringEndArchive, stringEndArchive64Locator)
|
|
|
|
stringDataDescriptor = b'PK\x07\x08' # magic number for data descriptor
|
|
|
|
|
|
def _get_compressor(compress_type):
|
|
"""
|
|
Return the compressor.
|
|
"""
|
|
|
|
if compress_type == zipfile.ZIP_DEFLATED:
|
|
from zipfile import zlib
|
|
return zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15)
|
|
elif compress_type == zipfile.ZIP_BZIP2:
|
|
from zipfile import bz2
|
|
return bz2.BZ2Compressor()
|
|
elif compress_type == zipfile.ZIP_LZMA:
|
|
from zipfile import LZMACompressor
|
|
return LZMACompressor()
|
|
else:
|
|
return None
|
|
|
|
|
|
class PointerIO(object):
|
|
|
|
def __init__(self, mode='wb'):
|
|
if mode not in ('wb', ):
|
|
raise RuntimeError('zipstream.ZipFile() requires mode "wb"')
|
|
self.data_pointer = 0
|
|
self.__mode = mode
|
|
self.__closed = False
|
|
|
|
@property
|
|
def mode(self):
|
|
return self.__mode
|
|
|
|
@property
|
|
def closed(self):
|
|
return self.__closed
|
|
|
|
def close(self):
|
|
self.__closed = True
|
|
|
|
def flush(self):
|
|
pass
|
|
|
|
def next(self):
|
|
raise NotImplementedError()
|
|
|
|
def tell(self):
|
|
return self.data_pointer
|
|
|
|
def truncate(size=None):
|
|
raise NotImplementedError()
|
|
|
|
def write(self, data):
|
|
if self.closed:
|
|
raise ValueError('I/O operation on closed file')
|
|
|
|
if isinstance(data, str):
|
|
data = data.encode('utf-8')
|
|
if not isinstance(data, bytes):
|
|
raise TypeError('expected bytes')
|
|
self.data_pointer += len(data)
|
|
return data
|
|
|
|
|
|
class ZipInfo(zipfile.ZipInfo):
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
zipfile.ZipInfo.__init__(self, *args, **kwargs)
|
|
|
|
def DataDescriptor(self):
|
|
"""
|
|
crc-32 4 bytes
|
|
compressed size 4 bytes
|
|
uncompressed size 4 bytes
|
|
"""
|
|
|
|
if self.compress_size > zipfile.ZIP64_LIMIT or self.file_size > zipfile.ZIP64_LIMIT:
|
|
fmt = b'<4sLQQ'
|
|
else:
|
|
fmt = b'<4sLLL'
|
|
return struct.pack(fmt, stringDataDescriptor, self.CRC, self.compress_size, self.file_size)
|
|
|
|
|
|
class ZipFile(zipfile.ZipFile):
|
|
|
|
def __init__(self, fileobj=None, mode='w', compression=zipfile.ZIP_STORED, allowZip64=True, chunksize=32768):
|
|
"""Open the ZIP file with mode write "w"."""
|
|
|
|
if mode not in ('w', ):
|
|
raise RuntimeError('aiozipstream.ZipFile() requires mode "w"')
|
|
if fileobj is None:
|
|
fileobj = PointerIO()
|
|
|
|
self._comment = b''
|
|
zipfile.ZipFile.__init__(self, fileobj, mode=mode, compression=compression, allowZip64=allowZip64)
|
|
self._chunksize = chunksize
|
|
self.paths_to_write = []
|
|
|
|
def __aiter__(self):
|
|
return self._stream()
|
|
|
|
@property
|
|
def comment(self):
|
|
"""
|
|
The comment text associated with the ZIP file.
|
|
"""
|
|
|
|
return self._comment
|
|
|
|
@comment.setter
|
|
def comment(self, comment):
|
|
"""
|
|
Add a comment text associated with the ZIP file.
|
|
"""
|
|
|
|
if not isinstance(comment, bytes):
|
|
raise TypeError("comment: expected bytes, got %s" % type(comment))
|
|
# check for valid comment length
|
|
if len(comment) >= zipfile.ZIP_MAX_COMMENT:
|
|
if self.debug:
|
|
print('Archive comment is too long; truncating to %d bytes' % zipfile.ZIP_MAX_COMMENT)
|
|
comment = comment[:zipfile.ZIP_MAX_COMMENT]
|
|
self._comment = comment
|
|
self._didModify = True
|
|
|
|
@async_generator
|
|
async def data_generator(self, path):
|
|
|
|
async with aiofiles.open(path, "rb") as f:
|
|
while True:
|
|
part = await f.read(self._chunksize)
|
|
if not part:
|
|
break
|
|
await yield_(part)
|
|
return
|
|
|
|
async def _run_in_executor(self, task, *args, **kwargs):
|
|
"""
|
|
Run synchronous task in separate thread and await for result.
|
|
"""
|
|
|
|
loop = asyncio.get_event_loop()
|
|
return await loop.run_in_executor(futures.ThreadPoolExecutor(max_workers=1), task, *args, **kwargs)
|
|
|
|
@async_generator
|
|
async def _stream(self):
|
|
|
|
for kwargs in self.paths_to_write:
|
|
async for chunk in self._write(**kwargs):
|
|
await yield_(chunk)
|
|
for chunk in self._close():
|
|
await yield_(chunk)
|
|
|
|
def write(self, filename, arcname=None, compress_type=None):
|
|
"""
|
|
Write a file to the archive under the name `arcname`.
|
|
"""
|
|
|
|
kwargs = {'filename': filename, 'arcname': arcname, 'compress_type': compress_type}
|
|
self.paths_to_write.append(kwargs)
|
|
|
|
def write_iter(self, arcname, iterable, compress_type=None):
|
|
"""
|
|
Write the bytes iterable `iterable` to the archive under the name `arcname`.
|
|
"""
|
|
|
|
kwargs = {'arcname': arcname, 'iterable': iterable, 'compress_type': compress_type}
|
|
self.paths_to_write.append(kwargs)
|
|
|
|
def writestr(self, arcname, data, compress_type=None):
|
|
"""
|
|
Writes a str into ZipFile by wrapping data as a generator
|
|
"""
|
|
|
|
def _iterable():
|
|
yield data
|
|
return self.write_iter(arcname, _iterable(), compress_type=compress_type)
|
|
|
|
@async_generator
|
|
async def _write(self, filename=None, iterable=None, arcname=None, compress_type=None):
|
|
"""
|
|
Put the bytes from filename into the archive under the name `arcname`.
|
|
"""
|
|
|
|
if not self.fp:
|
|
raise RuntimeError(
|
|
"Attempt to write to ZIP archive that was already closed")
|
|
if (filename is None and iterable is None) or (filename is not None and iterable is not None):
|
|
raise ValueError("either (exclusively) filename or iterable shall be not None")
|
|
|
|
if filename:
|
|
st = os.stat(filename)
|
|
isdir = stat.S_ISDIR(st.st_mode)
|
|
mtime = time.localtime(st.st_mtime)
|
|
date_time = mtime[0:6]
|
|
else:
|
|
st, isdir, date_time = None, False, time.localtime()[0:6]
|
|
# Create ZipInfo instance to store file information
|
|
if arcname is None:
|
|
arcname = filename
|
|
arcname = os.path.normpath(os.path.splitdrive(arcname)[1])
|
|
while arcname[0] in (os.sep, os.altsep):
|
|
arcname = arcname[1:]
|
|
if isdir:
|
|
arcname += '/'
|
|
zinfo = ZipInfo(arcname, date_time)
|
|
if st:
|
|
zinfo.external_attr = (st[0] & 0xFFFF) << 16 # Unix attributes
|
|
else:
|
|
zinfo.external_attr = 0o600 << 16 # ?rw-------
|
|
if compress_type is None:
|
|
zinfo.compress_type = self.compression
|
|
else:
|
|
zinfo.compress_type = compress_type
|
|
|
|
if st:
|
|
zinfo.file_size = st[6]
|
|
else:
|
|
zinfo.file_size = 0
|
|
zinfo.flag_bits = 0x00
|
|
zinfo.flag_bits |= 0x08 # ZIP flag bits, bit 3 indicates presence of data descriptor
|
|
zinfo.header_offset = self.fp.tell() # Start of header bytes
|
|
if zinfo.compress_type == zipfile.ZIP_LZMA:
|
|
# Compressed data includes an end-of-stream (EOS) marker
|
|
zinfo.flag_bits |= 0x02
|
|
|
|
self._writecheck(zinfo)
|
|
self._didModify = True
|
|
|
|
if isdir:
|
|
zinfo.file_size = 0
|
|
zinfo.compress_size = 0
|
|
zinfo.CRC = 0
|
|
self.filelist.append(zinfo)
|
|
self.NameToInfo[zinfo.filename] = zinfo
|
|
await yield_(self.fp.write(zinfo.FileHeader(False)))
|
|
return
|
|
|
|
cmpr = _get_compressor(zinfo.compress_type)
|
|
|
|
# Must overwrite CRC and sizes with correct data later
|
|
zinfo.CRC = CRC = 0
|
|
zinfo.compress_size = compress_size = 0
|
|
# Compressed size can be larger than uncompressed size
|
|
zip64 = self._allowZip64 and zinfo.file_size * 1.05 > zipfile.ZIP64_LIMIT
|
|
await yield_(self.fp.write(zinfo.FileHeader(zip64)))
|
|
|
|
file_size = 0
|
|
if filename:
|
|
async for buf in self.data_generator(filename):
|
|
file_size = file_size + len(buf)
|
|
CRC = zipfile.crc32(buf, CRC) & 0xffffffff
|
|
if cmpr:
|
|
buf = await self._run_in_executor(cmpr.compress, buf)
|
|
compress_size = compress_size + len(buf)
|
|
await yield_(self.fp.write(buf))
|
|
else: # we have an iterable
|
|
for buf in iterable:
|
|
file_size = file_size + len(buf)
|
|
CRC = zipfile.crc32(buf, CRC) & 0xffffffff
|
|
if cmpr:
|
|
buf = await self._run_in_executor(cmpr.compress, buf)
|
|
compress_size = compress_size + len(buf)
|
|
await yield_(self.fp.write(buf))
|
|
|
|
if cmpr:
|
|
buf = cmpr.flush()
|
|
compress_size = compress_size + len(buf)
|
|
await yield_(self.fp.write(buf))
|
|
zinfo.compress_size = compress_size
|
|
else:
|
|
zinfo.compress_size = file_size
|
|
zinfo.CRC = CRC
|
|
zinfo.file_size = file_size
|
|
if not zip64 and self._allowZip64:
|
|
if file_size > zipfile.ZIP64_LIMIT:
|
|
raise RuntimeError('File size has increased during compressing')
|
|
if compress_size > zipfile.ZIP64_LIMIT:
|
|
raise RuntimeError('Compressed size larger than uncompressed size')
|
|
|
|
await yield_(self.fp.write(zinfo.DataDescriptor()))
|
|
self.filelist.append(zinfo)
|
|
self.NameToInfo[zinfo.filename] = zinfo
|
|
|
|
def _close(self):
|
|
"""
|
|
Close the file, and for mode "w" write the ending records.
|
|
"""
|
|
|
|
if self.fp is None:
|
|
return
|
|
|
|
try:
|
|
if self.mode in ('w', 'a') and self._didModify: # write ending records
|
|
count = 0
|
|
pos1 = self.fp.tell()
|
|
for zinfo in self.filelist: # write central directory
|
|
count = count + 1
|
|
dt = zinfo.date_time
|
|
dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
|
|
dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
|
|
extra = []
|
|
if zinfo.file_size > zipfile.ZIP64_LIMIT or zinfo.compress_size > zipfile.ZIP64_LIMIT:
|
|
extra.append(zinfo.file_size)
|
|
extra.append(zinfo.compress_size)
|
|
file_size = 0xffffffff
|
|
compress_size = 0xffffffff
|
|
else:
|
|
file_size = zinfo.file_size
|
|
compress_size = zinfo.compress_size
|
|
|
|
if zinfo.header_offset > zipfile.ZIP64_LIMIT:
|
|
extra.append(zinfo.header_offset)
|
|
header_offset = 0xffffffff
|
|
else:
|
|
header_offset = zinfo.header_offset
|
|
|
|
extra_data = zinfo.extra
|
|
min_version = 0
|
|
if extra:
|
|
# Append a ZIP64 field to the extra's
|
|
extra_data = struct.pack(
|
|
b'<HH' + b'Q'*len(extra),
|
|
1, 8*len(extra), *extra) + extra_data
|
|
min_version = zipfile.ZIP64_VERSION
|
|
|
|
if zinfo.compress_type == zipfile.ZIP_BZIP2:
|
|
min_version = max(zipfile.BZIP2_VERSION, min_version)
|
|
elif zinfo.compress_type == zipfile.ZIP_LZMA:
|
|
min_version = max(zipfile.LZMA_VERSION, min_version)
|
|
|
|
extract_version = max(min_version, zinfo.extract_version)
|
|
create_version = max(min_version, zinfo.create_version)
|
|
try:
|
|
filename, flag_bits = zinfo._encodeFilenameFlags()
|
|
centdir = struct.pack(structCentralDir,
|
|
stringCentralDir, create_version,
|
|
zinfo.create_system, extract_version, zinfo.reserved,
|
|
flag_bits, zinfo.compress_type, dostime, dosdate,
|
|
zinfo.CRC, compress_size, file_size,
|
|
len(filename), len(extra_data), len(zinfo.comment),
|
|
0, zinfo.internal_attr, zinfo.external_attr,
|
|
header_offset)
|
|
except DeprecationWarning:
|
|
print((structCentralDir, stringCentralDir, create_version,
|
|
zinfo.create_system, extract_version, zinfo.reserved,
|
|
zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
|
|
zinfo.CRC, compress_size, file_size,
|
|
len(zinfo.filename), len(extra_data), len(zinfo.comment),
|
|
0, zinfo.internal_attr, zinfo.external_attr,
|
|
header_offset), file=sys.stderr)
|
|
raise
|
|
yield self.fp.write(centdir)
|
|
yield self.fp.write(filename)
|
|
yield self.fp.write(extra_data)
|
|
yield self.fp.write(zinfo.comment)
|
|
|
|
pos2 = self.fp.tell()
|
|
# Write end-of-zip-archive record
|
|
centDirCount = count
|
|
centDirSize = pos2 - pos1
|
|
centDirOffset = pos1
|
|
if (centDirCount >= zipfile.ZIP_FILECOUNT_LIMIT or
|
|
centDirOffset > zipfile.ZIP64_LIMIT or
|
|
centDirSize > zipfile.ZIP64_LIMIT):
|
|
# Need to write the ZIP64 end-of-archive records
|
|
zip64endrec = struct.pack(
|
|
structEndArchive64, stringEndArchive64,
|
|
44, 45, 45, 0, 0, centDirCount, centDirCount,
|
|
centDirSize, centDirOffset)
|
|
yield self.fp.write(zip64endrec)
|
|
|
|
zip64locrec = struct.pack(
|
|
structEndArchive64Locator,
|
|
stringEndArchive64Locator, 0, pos2, 1)
|
|
yield self.fp.write(zip64locrec)
|
|
centDirCount = min(centDirCount, 0xFFFF)
|
|
centDirSize = min(centDirSize, 0xFFFFFFFF)
|
|
centDirOffset = min(centDirOffset, 0xFFFFFFFF)
|
|
|
|
endrec = struct.pack(structEndArchive, stringEndArchive,
|
|
0, 0, centDirCount, centDirCount,
|
|
centDirSize, centDirOffset, len(self._comment))
|
|
yield self.fp.write(endrec)
|
|
yield self.fp.write(self._comment)
|
|
self.fp.flush()
|
|
finally:
|
|
fp = self.fp
|
|
self.fp = None
|
|
if not self._filePassed:
|
|
fp.close()
|