使用函数计算实现自动解压上传到OSS的ZIP文件
更新时间：
一键部署
当您需要自动解压缩上传到OSS的压缩文件时，可以通过使用函数计算来实现自动对压缩文件解压，当匹配解压规则的ZIP文件上传到对象存储后，自动触发函数计算进行解压。文件解压完成后，函数计算会将解压后的文件上传至对象存储的指定目录中。
注意事项
建议使用UTF-8或GB 2312编码命名您的文件或文件夹，否则可能会出现解压后的文件或文件夹名称出现乱码、解压过程中断等问题。
归档或冷归档类型的文件需先解冻再解压。
解压单个压缩包的最大时间是2小时，超过2小时未完成的任务会解压失败。
建议ZIP包里面的单文件大小最好不超过1 GB，否则可能解压失败。
建议设置函数的执行时长为2小时以上，最大可到24小时。
建议创建函数的地域和对象存储Bucket所在地域保持一致。
前提条件
操作流程
步骤一：创建函数
登录函数计算控制台，在左侧导航栏，单击函数。
在顶部菜单栏，选择地域，然后在函数页面，单击创建函数。
在创建函数页面，按需选择创建函数的方式，配置以下配置项，然后单击创建。
重要配置项说明，如下所示，其余配置项的设置请参见创建函数。
运行环境：选择为Python 3.10。
函数角色：选择已有角色或创建角色，请确保函数拥有访问OSS Bucket的权限，您可以为该角色授予AliyunOSSFullAccess权限策略。
在函数详情页面，选择代码页签，在代码编辑器中创建代码文件并编写代码，然后单击部署代码。
涉及的代码示例如下。当前示例代码支持一键部署，您可以单击右侧按钮一键部署以下代码到函数计算FC，且无需再手动执行后续创建触发器的步骤。start-unzip-oss-v3
index.py文件单击查看示例代码内容
# -*- coding: utf-8 -*- ''' 声明： 这个函数针对文件和文件夹命名编码是如下格式： 1. mac/linux 系统， 默认是utf-8 2. windows 系统， 默认是gb2312， 也可以是utf-8 对于其他编码，我们这里尝试使用chardet这个库进行编码判断，但是这个并不能保证100% 正确， 建议用户先调试函数，如果有必要再改写函数，并保证调试通过。 Statement: This function names and encodes files and folders as follows: 1. MAC/Linux system, default is utf-8 2. For Windows, the default is gb2312 or utf-8 For other encodings, we try to use the chardet library for coding judgment here, but this is not guaranteed to be 100% correct. If necessary to rewrite this function, and ensure that the debugging pass ''' import helper import oss2 import json import os import time import logging import chardet """ When a source/ prefix object is placed in an OSS, it is hoped that the object will be decompressed and then stored in the OSS as processed/ prefixed. For example, source/a.zip will be processed as processed/a/... "Source /", "processed/" can be changed according to the user's requirements. """ # Close the info log printed by the oss SDK logging.getLogger("oss2.api").setLevel(logging.ERROR) logging.getLogger("oss2.auth").setLevel(logging.ERROR) LOGGER = logging.getLogger() # a decorator for print the excute time of a function def print_excute_time(func): def wrapper(*args, **kwargs): local_time = time.time() ret = func(*args, **kwargs) LOGGER.info('current Function [%s] excute time is %.2f' % (func.__name__, time.time() - local_time)) return ret return wrapper def get_zipfile_name(origin_name): # 解决中文乱码问题 name = origin_name try: name_bytes = origin_name.encode(encoding="cp437") except: name_bytes = origin_name.encode(encoding="utf-8") # the string to be detect is long enough, the detection result accuracy is higher detect = chardet.detect(name_bytes) confidence = detect["confidence"] detect_encoding = detect["encoding"] if confidence > 0.75 and (detect_encoding.lower() in ["gb2312", "gbk", "gb18030", "ascii", "utf-8"]): try: if detect_encoding.lower() in ["gb2312", "gbk", "gb18030"]: detect_encoding = "gb18030" name = name_bytes.decode(detect_encoding) except: name = name_bytes.decode(encoding="gb18030") else: try: name = name_bytes.decode(encoding="gb18030") except: name = name_bytes.decode(encoding="utf-8") # fix windows \\ as dir segment name = name.replace("\\", "/") return name @print_excute_time def handler(event, context): """ The object from OSS will be decompressed automatically . param: event: The OSS event json string. Including oss object uri and other information. For detail info, please refer https://help.aliyun.com/document_detail/70140.html?spm=a2c4g.11186623.6.578.5eb8cc74AJCA9p#OSS param: context: The function context, including credential and runtime info. For detail info, please refer to https://help.aliyun.com/document_detail/56316.html#using-context """ evt_lst = json.loads(event) creds = context.credentials auth = oss2.StsAuth( creds.access_key_id, creds.access_key_secret, creds.security_token) evt = evt_lst['events'][0] bucket_name = evt['oss']['bucket']['name'] endpoint = 'oss-' + evt['region'] + '-internal.aliyuncs.com' bucket = oss2.Bucket(auth, endpoint, bucket_name) object_name = evt['oss']['object']['key'] if "ObjectCreated:PutSymlink" == evt['eventName']: object_name = bucket.get_symlink(object_name).target_key if object_name == "": raise RuntimeError('{} is invalid symlink file'.format( evt['oss']['object']['key'])) file_type = os.path.splitext(object_name)[1] if file_type != ".zip": raise RuntimeError('{} filetype is not zip'.format(object_name)) LOGGER.info("start to decompress zip file = {}".format(object_name)) lst = object_name.split("/") zip_name = lst[-1] PROCESSED_DIR = os.environ.get("PROCESSED_DIR", "") RETAIN_FILE_NAME = os.environ.get("RETAIN_FILE_NAME", "") if PROCESSED_DIR and PROCESSED_DIR[-1] != "/": PROCESSED_DIR += "/" if RETAIN_FILE_NAME == "false": newKey = PROCESSED_DIR else: newKey = PROCESSED_DIR + zip_name zip_fp = helper.OssStreamFileLikeObject(bucket, object_name) newKey = newKey.replace(".zip", "/") with helper.zipfile_support_oss.ZipFile(zip_fp) as zip_file: for name in zip_file.namelist(): with zip_file.open(name) as file_obj: name = get_zipfile_name(name) bucket.put_object(newKey + name, file_obj)helper.py文件单击查看示例代码内容
# -*- coding: utf-8 -*- import oss2 from oss2 import utils, models import ossZipfile as zipfile zipfile_support_oss = zipfile # support upload to oss as a file-like object def make_crc_adapter(data, init_crc=0): data = utils.to_bytes(data) # file-like object if hasattr(data, 'read'): return utils._FileLikeAdapter(data, crc_callback=utils.Crc64(init_crc)) utils.make_crc_adapter = make_crc_adapter class OssStreamFileLikeObject(object): def __init__(self, bucket, key): super(OssStreamFileLikeObject, self).__init__() self._bucket = bucket self._key = key self._meta_data = self._bucket.get_object_meta(self._key) @property def bucket(self): return self._bucket @property def key(self): return self._key @property def filesize(self): return self._meta_data.content_length def get_reader(self, begin, end): begin = begin if begin >= 0 else 0 end = end if end > 0 else self.filesize - 1 end = end if end < self.filesize else self.filesize - 1 begin = begin if begin < end else end return self._bucket.get_object(self._key, byte_range=(begin, end)) def get_content_bytes(self, begin, end): reader = self.get_reader(begin, end) return reader.read() def get_last_content_bytes(self, offset): return self.get_content_bytes(self.filesize-offset, self.filesize-1)ossZipfile.py文件单击查看示例代码内容
""" Read and write ZIP files. XXX references to utf-8 need further investigation. """ import io import os import importlib.util import sys import time import stat import shutil import struct import binascii import threading try: import zlib # We may need its compression method crc32 = zlib.crc32 except ImportError: zlib = None crc32 = binascii.crc32 try: import bz2 # We may need its compression method except ImportError: bz2 = None try: import lzma # We may need its compression method except ImportError: lzma = None __all__ = ["BadZipFile", "BadZipfile", "error", "ZIP_STORED", "ZIP_DEFLATED", "ZIP_BZIP2", "ZIP_LZMA", "is_zipfile", "ZipInfo", "ZipFile", "PyZipFile", "LargeZipFile"] class BadZipFile(Exception): pass class LargeZipFile(Exception): """ Raised when writing a zipfile, the zipfile requires ZIP64 extensions and those extensions are disabled. """ error = BadZipfile = BadZipFile # Pre-3.2 compatibility names ZIP64_LIMIT = (1 << 31) - 1 ZIP_FILECOUNT_LIMIT = (1 << 16) - 1 ZIP_MAX_COMMENT = (1 << 16) - 1 # constants for Zip file compression methods ZIP_STORED = 0 ZIP_DEFLATED = 8 ZIP_BZIP2 = 12 ZIP_LZMA = 14 # Other ZIP compression methods not supported DEFAULT_VERSION = 20 ZIP64_VERSION = 45 BZIP2_VERSION = 46 LZMA_VERSION = 63 # we recognize (but not necessarily support) all features up to that version MAX_EXTRACT_VERSION = 63 # Below are some formats and associated data for reading/writing headers using # the struct module. The names and structures of headers/records are those used # in the PKWARE description of the ZIP file format: # http://www.pkware.com/documents/casestudies/APPNOTE.TXT # (URL valid as of January 2008) # The "end of central directory" structure, magic number, size, and indices # (section V.I in the format document) structEndArchive = b"<4s4H2LH" stringEndArchive = b"PK\005\006" sizeEndCentDir = struct.calcsize(structEndArchive) _ECD_SIGNATURE = 0 _ECD_DISK_NUMBER = 1 _ECD_DISK_START = 2 _ECD_ENTRIES_THIS_DISK = 3 _ECD_ENTRIES_TOTAL = 4 _ECD_SIZE = 5 _ECD_OFFSET = 6 _ECD_COMMENT_SIZE = 7 # These last two indices are not part of the structure as defined in the # spec, but they are used internally by this module as a convenience _ECD_COMMENT = 8 _ECD_LOCATION = 9 # The "central directory" structure, magic number, size, and indices # of entries in the structure (section V.F in the format document) structCentralDir = "<4s4B4HL2L5H2L" stringCentralDir = b"PK\001\002" sizeCentralDir = struct.calcsize(structCentralDir) # indexes of entries in the central directory structure _CD_SIGNATURE = 0 _CD_CREATE_VERSION = 1 _CD_CREATE_SYSTEM = 2 _CD_EXTRACT_VERSION = 3 _CD_EXTRACT_SYSTEM = 4 _CD_FLAG_BITS = 5 _CD_COMPRESS_TYPE = 6 _CD_TIME = 7 _CD_DATE = 8 _CD_CRC = 9 _CD_COMPRESSED_SIZE = 10 _CD_UNCOMPRESSED_SIZE = 11 _CD_FILENAME_LENGTH = 12 _CD_EXTRA_FIELD_LENGTH = 13 _CD_COMMENT_LENGTH = 14 _CD_DISK_NUMBER_START = 15 _CD_INTERNAL_FILE_ATTRIBUTES = 16 _CD_EXTERNAL_FILE_ATTRIBUTES = 17 _CD_LOCAL_HEADER_OFFSET = 18 # The "local file header" structure, magic number, size, and indices # (section V.A in the format document) structFileHeader = "<4s2B4HL2L2H" stringFileHeader = b"PK\003\004" sizeFileHeader = struct.calcsize(structFileHeader) _FH_SIGNATURE = 0 _FH_EXTRACT_VERSION = 1 _FH_EXTRACT_SYSTEM = 2 _FH_GENERAL_PURPOSE_FLAG_BITS = 3 _FH_COMPRESSION_METHOD = 4 _FH_LAST_MOD_TIME = 5 _FH_LAST_MOD_DATE = 6 _FH_CRC = 7 _FH_COMPRESSED_SIZE = 8 _FH_UNCOMPRESSED_SIZE = 9 _FH_FILENAME_LENGTH = 10 _FH_EXTRA_FIELD_LENGTH = 11 # The "Zip64 end of central directory locator" structure, magic number, and size structEndArchive64Locator = "<4sLQL" stringEndArchive64Locator = b"PK\x06\x07" sizeEndCentDir64Locator = struct.calcsize(structEndArchive64Locator) # The "Zip64 end of central directory" record, magic number, size, and indices # (section V.G in the format document) structEndArchive64 = "<4sQ2H2L4Q" stringEndArchive64 = b"PK\x06\x06" sizeEndCentDir64 = struct.calcsize(structEndArchive64) _CD64_SIGNATURE = 0 _CD64_DIRECTORY_RECSIZE = 1 _CD64_CREATE_VERSION = 2 _CD64_EXTRACT_VERSION = 3 _CD64_DISK_NUMBER = 4 _CD64_DISK_NUMBER_START = 5 _CD64_NUMBER_ENTRIES_THIS_DISK = 6 _CD64_NUMBER_ENTRIES_TOTAL = 7 _CD64_DIRECTORY_SIZE = 8 _CD64_OFFSET_START_CENTDIR = 9 def _check_zipfile(fp): try: if _EndRecData(fp): return True # file has correct magic number except OSError: pass return False def is_zipfile(filename): """Quickly see if a file is a ZIP file by checking the magic number. The filename argument may be a file or file-like object too. """ result = False try: if hasattr(filename, "read"): result = _check_zipfile(fp=filename) else: with open(filename, "rb") as fp: result = _check_zipfile(fp) except OSError: pass return result def _EndRecData64(fpin, offset, endrec): """ Read the ZIP64 end-of-archive records and use that to update endrec """ if hasattr(fpin, 'bucket'): data = fpin.get_content_bytes( fpin.filesize+offset-sizeEndCentDir64Locator, fpin.filesize+offset-1) else: try: fpin.seek(offset - sizeEndCentDir64Locator, 2) except OSError: # If the seek fails, the file is not large enough to contain a ZIP64 # end-of-archive record, so just return the end record we were given. return endrec data = fpin.read(sizeEndCentDir64Locator) if len(data) != sizeEndCentDir64Locator: return endrec sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data) if sig != stringEndArchive64Locator: return endrec if diskno != 0 or disks != 1: raise BadZipFile("zipfiles that span multiple disks are not supported") # Assume no 'zip64 extensible data' if hasattr(fpin, 'bucket'): data = fpin.get_content_bytes( fpin.filesize + offset - sizeEndCentDir64Locator - sizeEndCentDir64, fpin.filesize+offset-sizeEndCentDir64Locator-1) else: fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2) data = fpin.read(sizeEndCentDir64) if len(data) != sizeEndCentDir64: return endrec sig, sz, create_version, read_version, disk_num, disk_dir, \ dircount, dircount2, dirsize, diroffset = \ struct.unpack(structEndArchive64, data) if sig != stringEndArchive64: return endrec # Update the original endrec using data from the ZIP64 record endrec[_ECD_SIGNATURE] = sig endrec[_ECD_DISK_NUMBER] = disk_num endrec[_ECD_DISK_START] = disk_dir endrec[_ECD_ENTRIES_THIS_DISK] = dircount endrec[_ECD_ENTRIES_TOTAL] = dircount2 endrec[_ECD_SIZE] = dirsize endrec[_ECD_OFFSET] = diroffset return endrec def _EndRecData(fpin): """Return data from the "End of Central Directory" record, or None. The data is a list of the nine items in the ZIP "End of central dir" record followed by a tenth item, the file seek offset of this record.""" # Determine file size if hasattr(fpin, 'bucket'): filesize = fpin.filesize data = fpin.get_last_content_bytes(sizeEndCentDir) else: fpin.seek(0, 2) filesize = fpin.tell() # Check to see if this is ZIP file with no archive comment (the # "end of central directory" structure should be the last item in the # file if this is the case). try: fpin.seek(-sizeEndCentDir, 2) except OSError: return None data = fpin.read() if (len(data) == sizeEndCentDir and data[0:4] == stringEndArchive and data[-2:] == b"\000\000"): # the signature is correct and there's no comment, unpack structure endrec = struct.unpack(structEndArchive, data) endrec = list(endrec) # Append a blank comment and record start offset endrec.append(b"") endrec.append(filesize - sizeEndCentDir) # Try to read the "Zip64 end of central directory" structure return _EndRecData64(fpin, -sizeEndCentDir, endrec) # Either this is not a ZIP file, or it is a ZIP file with an archive # comment. Search the end of the file for the "end of central directory" # record signature. The comment is the last item in the ZIP file and may be # up to 64K long. It is assumed that the "end of central directory" magic # number does not appear in the comment. maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0) if hasattr(fpin, 'bucket'): data = fpin.get_content_bytes(maxCommentStart, -1) else: fpin.seek(maxCommentStart, 0) data = fpin.read() start = data.rfind(stringEndArchive) if start >= 0: # found the magic number; attempt to unpack and interpret recData = data[start:start+sizeEndCentDir] if len(recData) != sizeEndCentDir: # Zip file is corrupted. return None endrec = list(struct.unpack(structEndArchive, recData)) commentSize = endrec[_ECD_COMMENT_SIZE] # as claimed by the zip file comment = data[start+sizeEndCentDir:start+sizeEndCentDir+commentSize] endrec.append(comment) endrec.append(maxCommentStart + start) # Try to read the "Zip64 end of central directory" structure return _EndRecData64(fpin, maxCommentStart + start - filesize, endrec) # Unable to find a valid end of central directory structure return None class ZipInfo (object): """Class with attributes describing each file in the ZIP archive.""" __slots__ = ( 'orig_filename', 'filename', 'date_time', 'compress_type', 'comment', 'extra', 'create_system', 'create_version', 'extract_version', 'reserved', 'flag_bits', 'volume', 'internal_attr', 'external_attr', 'header_offset', 'CRC', 'compress_size', 'file_size', '_raw_time', ) def __init__(self, filename="NoName", date_time=(1980, 1, 1, 0, 0, 0)): self.orig_filename = filename # Original file name in archive # Terminate the file name at the first null byte. Null bytes in file # names are used as tricks by viruses in archives. null_byte = filename.find(chr(0)) if null_byte >= 0: filename = filename[0:null_byte] # This is used to ensure paths in generated ZIP files always use # forward slashes as the directory separator, as required by the # ZIP format specification. if os.sep != "/" and os.sep in filename: filename = filename.replace(os.sep, "/") self.filename = filename # Normalized file name self.date_time = date_time # year, month, day, hour, min, sec if date_time[0] < 1980: raise ValueError('ZIP does not support timestamps before 1980') # Standard values: self.compress_type = ZIP_STORED # Type of compression for the file self.comment = b"" # Comment for each file self.extra = b"" # ZIP extra data if sys.platform == 'win32': self.create_system = 0 # System which created ZIP archive else: # Assume everything else is unix-y self.create_system = 3 # System which created ZIP archive self.create_version = DEFAULT_VERSION # Version which created ZIP archive self.extract_version = DEFAULT_VERSION # Version needed to extract archive self.reserved = 0 # Must be zero self.flag_bits = 0 # ZIP flag bits self.volume = 0 # Volume number of file header self.internal_attr = 0 # Internal attributes self.external_attr = 0 # External file attributes # Other attributes are set by class ZipFile: # header_offset Byte offset to the file header # CRC CRC-32 of the uncompressed file # compress_size Size of the compressed file # file_size Size of the uncompressed file def __repr__(self): result = ['<%s filename=%r' % (self.__class__.__name__, self.filename)] if self.compress_type != ZIP_STORED: result.append(' compress_type=%s' % compressor_names.get(self.compress_type, self.compress_type)) hi = self.external_attr >> 16 lo = self.external_attr & 0xFFFF if hi: result.append(' filemode=%r' % stat.filemode(hi)) if lo: result.append(' external_attr=%#x' % lo) isdir = self.is_dir() if not isdir or self.file_size: result.append(' file_size=%r' % self.file_size) if ((not isdir or self.compress_size) and (self.compress_type != ZIP_STORED or self.file_size != self.compress_size)): result.append(' compress_size=%r' % self.compress_size) result.append('>') return ''.join(result) def FileHeader(self, zip64=None): """Return the per-file header as a string.""" dt = self.date_time dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2] dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2) if self.flag_bits & 0x08: # Set these to zero because we write them after the file data CRC = compress_size = file_size = 0 else: CRC = self.CRC compress_size = self.compress_size file_size = self.file_size extra = self.extra min_version = 0 if zip64 is None: zip64 = file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT if zip64: fmt = '<HHQQ' extra = extra + struct.pack(fmt, 1, struct.calcsize(fmt)-4, file_size, compress_size) if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT: if not zip64: raise LargeZipFile("Filesize would require ZIP64 extensions") # File is larger than what fits into a 4 byte integer, # fall back to the ZIP64 extension file_size = 0xffffffff compress_size = 0xffffffff min_version = ZIP64_VERSION if self.compress_type == ZIP_BZIP2: min_version = max(BZIP2_VERSION, min_version) elif self.compress_type == ZIP_LZMA: min_version = max(LZMA_VERSION, min_version) self.extract_version = max(min_version, self.extract_version) self.create_version = max(min_version, self.create_version) filename, flag_bits = self._encodeFilenameFlags() header = struct.pack(structFileHeader, stringFileHeader, self.extract_version, self.reserved, flag_bits, self.compress_type, dostime, dosdate, CRC, compress_size, file_size, len(filename), len(extra)) return header + filename + extra def _encodeFilenameFlags(self): try: return self.filename.encode('ascii'), self.flag_bits except UnicodeEncodeError: return self.filename.encode('utf-8'), self.flag_bits | 0x800 def _decodeExtra(self): # Try to decode the extra field. extra = self.extra unpack = struct.unpack while len(extra) >= 4: tp, ln = unpack('<HH', extra[:4]) if ln+4 > len(extra): raise BadZipFile( "Corrupt extra field %04x (size=%d)" % (tp, ln)) if tp == 0x0001: if ln >= 24: counts = unpack('<QQQ', extra[4:28]) elif ln == 16: counts = unpack('<QQ', extra[4:20]) elif ln == 8: counts = unpack('<Q', extra[4:12]) elif ln == 0: counts = () else: raise BadZipFile( "Corrupt extra field %04x (size=%d)" % (tp, ln)) idx = 0 # ZIP64 extension (large files and/or large archives) if self.file_size in (0xffffffffffffffff, 0xffffffff): self.file_size = counts[idx] idx += 1 if self.compress_size == 0xFFFFFFFF: self.compress_size = counts[idx] idx += 1 if self.header_offset == 0xffffffff: old = self.header_offset self.header_offset = counts[idx] idx += 1 extra = extra[ln+4:] @classmethod def from_file(cls, filename, arcname=None): """Construct an appropriate ZipInfo for a file on the filesystem. filename should be the path to a file or directory on the filesystem. arcname is the name which it will have within the archive (by default, this will be the same as filename, but without a drive letter and with leading path separators removed). """ if isinstance(filename, os.PathLike): filename = os.fspath(filename) st = os.stat(filename) isdir = stat.S_ISDIR(st.st_mode) mtime = time.localtime(st.st_mtime) date_time = mtime[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 = cls(arcname, date_time) zinfo.external_attr = (st.st_mode & 0xFFFF) << 16 # Unix attributes if isdir: zinfo.file_size = 0 zinfo.external_attr |= 0x10 # MS-DOS directory flag else: zinfo.file_size = st.st_size return zinfo def is_dir(self): """Return True if this archive member is a directory.""" return self.filename[-1] == '/' # ZIP encryption uses the CRC32 one-byte primitive for scrambling some # internal keys. We noticed that a direct implementation is faster than # relying on binascii.crc32(). _crctable = None def _gen_crc(crc): for j in range(8): if crc & 1: crc = (crc >> 1) ^ 0xEDB88320 else: crc >>= 1 return crc # ZIP supports a password-based form of encryption. Even though known # plaintext attacks have been found against it, it is still useful # to be able to get data out of such a file. # # Usage: # zd = _ZipDecrypter(mypwd) # plain_bytes = zd(cypher_bytes) def _ZipDecrypter(pwd): key0 = 305419896 key1 = 591751049 key2 = 878082192 global _crctable if _crctable is None: _crctable = list(map(_gen_crc, range(256))) crctable = _crctable def crc32(ch, crc): """Compute the CRC32 primitive on one byte.""" return (crc >> 8) ^ crctable[(crc ^ ch) & 0xFF] def update_keys(c): nonlocal key0, key1, key2 key0 = crc32(c, key0) key1 = (key1 + (key0 & 0xFF)) & 0xFFFFFFFF key1 = (key1 * 134775813 + 1) & 0xFFFFFFFF key2 = crc32(key1 >> 24, key2) for p in pwd: update_keys(p) def decrypter(data): """Decrypt a bytes object.""" result = bytearray() append = result.append for c in data: k = key2 | 2 c ^= ((k * (k ^ 1)) >> 8) & 0xFF update_keys(c) append(c) return bytes(result) return decrypter class LZMACompressor: def __init__(self): self._comp = None def _init(self): props = lzma._encode_filter_properties({'id': lzma.FILTER_LZMA1}) self._comp = lzma.LZMACompressor(lzma.FORMAT_RAW, filters=[ lzma._decode_filter_properties(lzma.FILTER_LZMA1, props) ]) return struct.pack('<BBH', 9, 4, len(props)) + props def compress(self, data): if self._comp is None: return self._init() + self._comp.compress(data) return self._comp.compress(data) def flush(self): if self._comp is None: return self._init() + self._comp.flush() return self._comp.flush() class LZMADecompressor: def __init__(self): self._decomp = None self._unconsumed = b'' self.eof = False def decompress(self, data): if self._decomp is None: self._unconsumed += data if len(self._unconsumed) <= 4: return b'' psize, = struct.unpack('<H', self._unconsumed[2:4]) if len(self._unconsumed) <= 4 + psize: return b'' self._decomp = lzma.LZMADecompressor(lzma.FORMAT_RAW, filters=[ lzma._decode_filter_properties(lzma.FILTER_LZMA1, self._unconsumed[4:4 + psize]) ]) data = self._unconsumed[4 + psize:] del self._unconsumed result = self._decomp.decompress(data) self.eof = self._decomp.eof return result compressor_names = { 0: 'store', 1: 'shrink', 2: 'reduce', 3: 'reduce', 4: 'reduce', 5: 'reduce', 6: 'implode', 7: 'tokenize', 8: 'deflate', 9: 'deflate64', 10: 'implode', 12: 'bzip2', 14: 'lzma', 18: 'terse', 19: 'lz77', 97: 'wavpack', 98: 'ppmd', } def _check_compression(compression): if compression == ZIP_STORED: pass elif compression == ZIP_DEFLATED: if not zlib: raise RuntimeError( "Compression requires the (missing) zlib module") elif compression == ZIP_BZIP2: if not bz2: raise RuntimeError( "Compression requires the (missing) bz2 module") elif compression == ZIP_LZMA: if not lzma: raise RuntimeError( "Compression requires the (missing) lzma module") else: raise NotImplementedError("That compression method is not supported") def _get_compressor(compress_type): if compress_type == ZIP_DEFLATED: return zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15) elif compress_type == ZIP_BZIP2: return bz2.BZ2Compressor() elif compress_type == ZIP_LZMA: return LZMACompressor() else: return None def _get_decompressor(compress_type): if compress_type == ZIP_STORED: return None elif compress_type == ZIP_DEFLATED: return zlib.decompressobj(-15) elif compress_type == ZIP_BZIP2: return bz2.BZ2Decompressor() elif compress_type == ZIP_LZMA: return LZMADecompressor() else: descr = compressor_names.get(compress_type) if descr: raise NotImplementedError( "compression type %d (%s)" % (compress_type, descr)) else: raise NotImplementedError("compression type %d" % (compress_type,)) class _SharedFile: def __init__(self, file, pos, close, lock, writing): self._file = file self._pos = pos self._close = close self._lock = lock self._writing = writing if hasattr(self._file, "bucket"): self._fp = self._file.get_reader(pos, -1) def read(self, n=-1): with self._lock: if self._writing(): raise ValueError("Can't read from the ZIP file while there " "is an open writing handle on it. " "Close the writing handle before trying to read.") if hasattr(self._file, "bucket"): data = self._fp.read(n) self._pos += n else: self._file.seek(self._pos) data = self._file.read(n) self._pos = self._file.tell() return data def close(self): if self._file is not None: fileobj = self._file self._file = None self._close(fileobj) # Provide the tell method for unseekable stream class _Tellable: def __init__(self, fp): self.fp = fp self.offset = 0 def write(self, data): n = self.fp.write(data) self.offset += n return n def tell(self): return self.offset def flush(self): self.fp.flush() def close(self): self.fp.close() class ZipExtFile(io.BufferedIOBase): """File-like object for reading an archive member. Is returned by ZipFile.open(). """ # Max size supported by decompressor. MAX_N = 1 << 31 - 1 # Read from compressed files in 4k blocks. MIN_READ_SIZE = 4096 def __init__(self, fileobj, mode, zipinfo, decrypter=None, close_fileobj=False): self._fileobj = fileobj self._decrypter = decrypter self._close_fileobj = close_fileobj self._compress_type = zipinfo.compress_type self._compress_left = zipinfo.compress_size self._left = zipinfo.file_size self._decompressor = _get_decompressor(self._compress_type) self._eof = False self._readbuffer = b'' self._offset = 0 self.newlines = None # Adjust read size for encrypted files since the first 12 bytes # are for the encryption/password information. if self._decrypter is not None: self._compress_left -= 12 self.mode = mode self.name = zipinfo.filename if hasattr(zipinfo, 'CRC'): self._expected_crc = zipinfo.CRC self._running_crc = crc32(b'') else: self._expected_crc = None def __repr__(self): result = ['<%s.%s' % (self.__class__.__module__, self.__class__.__qualname__)] if not self.closed: result.append(' name=%r mode=%r' % (self.name, self.mode)) if self._compress_type != ZIP_STORED: result.append(' compress_type=%s' % compressor_names.get(self._compress_type, self._compress_type)) else: result.append(' [closed]') result.append('>') return ''.join(result) def readline(self, limit=-1): """Read and return a line from the stream. If limit is specified, at most limit bytes will be read. """ if limit < 0: # Shortcut common case - newline found in buffer. i = self._readbuffer.find(b'\n', self._offset) + 1 if i > 0: line = self._readbuffer[self._offset: i] self._offset = i return line return io.BufferedIOBase.readline(self, limit) def peek(self, n=1): """Returns buffered bytes without advancing the position.""" if n > len(self._readbuffer) - self._offset: chunk = self.read(n) if len(chunk) > self._offset: self._readbuffer = chunk + self._readbuffer[self._offset:] self._offset = 0 else: self._offset -= len(chunk) # Return up to 512 bytes to reduce allocation overhead for tight loops. return self._readbuffer[self._offset: self._offset + 512] def readable(self): return True def read(self, n=-1): """Read and return up to n bytes. If the argument is omitted, None, or negative, data is read and returned until EOF is reached.. """ if n is None or n < 0: buf = self._readbuffer[self._offset:] self._readbuffer = b'' self._offset = 0 while not self._eof: buf += self._read1(self.MAX_N) return buf end = n + self._offset if end < len(self._readbuffer): buf = self._readbuffer[self._offset:end] self._offset = end return buf n = end - len(self._readbuffer) buf = self._readbuffer[self._offset:] self._readbuffer = b'' self._offset = 0 while n > 0 and not self._eof: data = self._read1(n) if n < len(data): self._readbuffer = data self._offset = n buf += data[:n] break buf += data n -= len(data) return buf def _update_crc(self, newdata): # Update the CRC using the given data. if self._expected_crc is None: # No need to compute the CRC if we don't have a reference value return self._running_crc = crc32(newdata, self._running_crc) # Check the CRC if we're at the end of the file if self._eof and self._running_crc != self._expected_crc: raise BadZipFile("Bad CRC-32 for file %r" % self.name) def read1(self, n): """Read up to n bytes with at most one read() system call.""" if n is None or n < 0: buf = self._readbuffer[self._offset:] self._readbuffer = b'' self._offset = 0 while not self._eof: data = self._read1(self.MAX_N) if data: buf += data break return buf end = n + self._offset if end < len(self._readbuffer): buf = self._readbuffer[self._offset:end] self._offset = end return buf n = end - len(self._readbuffer) buf = self._readbuffer[self._offset:] self._readbuffer = b'' self._offset = 0 if n > 0: while not self._eof: data = self._read1(n) if n < len(data): self._readbuffer = data self._offset = n buf += data[:n] break if data: buf += data break return buf def _read1(self, n): # Read up to n compressed bytes with at most one read() system call, # decrypt and decompress them. if self._eof or n <= 0: return b'' # Read from file. if self._compress_type == ZIP_DEFLATED: # Handle unconsumed data. data = self._decompressor.unconsumed_tail if n > len(data): data += self._read2(n - len(data)) else: data = self._read2(n) if self._compress_type == ZIP_STORED: self._eof = self._compress_left <= 0 elif self._compress_type == ZIP_DEFLATED: n = max(n, self.MIN_READ_SIZE) data = self._decompressor.decompress(data, n) self._eof = (self._decompressor.eof or self._compress_left <= 0 and not self._decompressor.unconsumed_tail) if self._eof: data += self._decompressor.flush() else: data = self._decompressor.decompress(data) self._eof = self._decompressor.eof or self._compress_left <= 0 data = data[:self._left] self._left -= len(data) if self._left <= 0: self._eof = True self._update_crc(data) return data def _read2(self, n): if self._compress_left <= 0: return b'' n = max(n, self.MIN_READ_SIZE) n = min(n, self._compress_left) data = self._fileobj.read(n) self._compress_left -= len(data) if not data: raise EOFError if self._decrypter is not None: data = self._decrypter(data) return data def close(self): try: if self._close_fileobj: self._fileobj.close() finally: super().close() class _ZipWriteFile(io.BufferedIOBase): def __init__(self, zf, zinfo, zip64): self._zinfo = zinfo self._zip64 = zip64 self._zipfile = zf self._compressor = _get_compressor(zinfo.compress_type) self._file_size = 0 self._compress_size = 0 self._crc = 0 @property def _fileobj(self): return self._zipfile.fp def writable(self): return True def write(self, data): if self.closed: raise ValueError('I/O operation on closed file.') nbytes = len(data) self._file_size += nbytes self._crc = crc32(data, self._crc) if self._compressor: data = self._compressor.compress(data) self._compress_size += len(data) self._fileobj.write(data) return nbytes def close(self): if self.closed: return super().close() # Flush any data from the compressor, and update header info if self._compressor: buf = self._compressor.flush() self._compress_size += len(buf) self._fileobj.write(buf) self._zinfo.compress_size = self._compress_size else: self._zinfo.compress_size = self._file_size self._zinfo.CRC = self._crc self._zinfo.file_size = self._file_size # Write updated header info if self._zinfo.flag_bits & 0x08: # Write CRC and file sizes after the file data fmt = '<LQQ' if self._zip64 else '<LLL' self._fileobj.write(struct.pack(fmt, self._zinfo.CRC, self._zinfo.compress_size, self._zinfo.file_size)) self._zipfile.start_dir = self._fileobj.tell() else: if not self._zip64: if self._file_size > ZIP64_LIMIT: raise RuntimeError('File size unexpectedly exceeded ZIP64 ' 'limit') if self._compress_size > ZIP64_LIMIT: raise RuntimeError('Compressed size unexpectedly exceeded ' 'ZIP64 limit') # Seek backwards and write file header (which will now include # correct CRC and file sizes) # Preserve current position in file self._zipfile.start_dir = self._fileobj.tell() self._fileobj.seek(self._zinfo.header_offset) self._fileobj.write(self._zinfo.FileHeader(self._zip64)) self._fileobj.seek(self._zipfile.start_dir) self._zipfile._writing = False # Successfully written: Add file to our caches self._zipfile.filelist.append(self._zinfo) self._zipfile.NameToInfo[self._zinfo.filename] = self._zinfo class ZipFile: """ Class with methods to open, read, write, close, list zip files. z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=True) file: Either the path to the file, or a file-like object. If it is a path, the file will be opened and closed by ZipFile. mode: The mode can be either read 'r', write 'w', exclusive create 'x', or append 'a'. compression: ZIP_STORED (no compression), ZIP_DEFLATED (requires zlib), ZIP_BZIP2 (requires bz2) or ZIP_LZMA (requires lzma). allowZip64: if True ZipFile will create files with ZIP64 extensions when needed, otherwise it will raise an exception when this would be necessary. """ fp = None # Set here since __del__ checks it _windows_illegal_name_trans_table = None def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=True): """Open the ZIP file with mode read 'r', write 'w', exclusive create 'x', or append 'a'.""" if mode not in ('r', 'w', 'x', 'a'): raise ValueError("ZipFile requires mode 'r', 'w', 'x', or 'a'") _check_compression(compression) self._allowZip64 = allowZip64 self._didModify = False self.debug = 0 # Level of printing: 0 through 3 self.NameToInfo = {} # Find file info given name self.filelist = [] # List of ZipInfo instances for archive self.compression = compression # Method of compression self.mode = mode self.pwd = None self._comment = b'' # Check if we were passed a file-like object if isinstance(file, os.PathLike): file = os.fspath(file) if isinstance(file, str): # No, it's a filename self._filePassed = 0 self.filename = file modeDict = {'r': 'rb', 'w': 'w+b', 'x': 'x+b', 'a': 'r+b', 'r+b': 'w+b', 'w+b': 'wb', 'x+b': 'xb'} filemode = modeDict[mode] while True: try: self.fp = io.open(file, filemode) except OSError: if filemode in modeDict: filemode = modeDict[filemode] continue raise break else: self._filePassed = 1 self.fp = file self.filename = getattr(file, 'name', None) self._fileRefCnt = 1 self._lock = threading.RLock() self._seekable = True self._writing = False try: if mode == 'r': self._RealGetContents() elif mode in ('w', 'x'): # set the modified flag so central directory gets written # even if no files are added to the archive self._didModify = True try: self.start_dir = self.fp.tell() except (AttributeError, OSError): self.fp = _Tellable(self.fp) self.start_dir = 0 self._seekable = False else: # Some file-like objects can provide tell() but not seek() try: self.fp.seek(self.start_dir) except (AttributeError, OSError): self._seekable = False elif mode == 'a': try: # See if file is a zip file self._RealGetContents() # seek to start of directory and overwrite self.fp.seek(self.start_dir) except BadZipFile: # file is not a zip file, just append self.fp.seek(0, 2) # set the modified flag so central directory gets written # even if no files are added to the archive self._didModify = True self.start_dir = self.fp.tell() else: raise ValueError("Mode must be 'r', 'w', 'x', or 'a'") except: fp = self.fp self.fp = None self._fpclose(fp) raise def __enter__(self): return self def __exit__(self, type, value, traceback): self.close() def __repr__(self): result = ['<%s.%s' % (self.__class__.__module__, self.__class__.__qualname__)] if self.fp is not None: if self._filePassed: result.append(' file=%r' % self.fp) elif self.filename is not None: result.append(' filename=%r' % self.filename) result.append(' mode=%r' % self.mode) else: result.append(' [closed]') result.append('>') return ''.join(result) def _RealGetContents(self): """Read in the table of contents for the ZIP file.""" fp = self.fp try: endrec = _EndRecData(fp) except OSError: raise BadZipFile("File is not a zip file") if not endrec: raise BadZipFile("File is not a zip file") if self.debug > 1: print(endrec) size_cd = endrec[_ECD_SIZE] # bytes in central directory offset_cd = endrec[_ECD_OFFSET] # offset of central directory self._comment = endrec[_ECD_COMMENT] # archive comment # "concat" is zero, unless zip was concatenated to another file concat = endrec[_ECD_LOCATION] - size_cd - offset_cd if endrec[_ECD_SIGNATURE] == stringEndArchive64: # If Zip64 extension structures are present, account for them concat -= (sizeEndCentDir64 + sizeEndCentDir64Locator) if self.debug > 2: inferred = concat + offset_cd print("given, inferred, offset", offset_cd, inferred, concat) # self.start_dir: Position of start of central directory self.start_dir = offset_cd + concat if hasattr(fp, "bucket"): data = fp.get_content_bytes( self.start_dir, self.start_dir+size_cd-1) else: fp.seek(self.start_dir, 0) data = fp.read(size_cd) fp = io.BytesIO(data) total = 0 while total < size_cd: centdir = fp.read(sizeCentralDir) if len(centdir) != sizeCentralDir: raise BadZipFile("Truncated central directory") centdir = struct.unpack(structCentralDir, centdir) if centdir[_CD_SIGNATURE] != stringCentralDir: raise BadZipFile("Bad magic number for central directory") if self.debug > 2: print(centdir) filename = fp.read(centdir[_CD_FILENAME_LENGTH]) flags = centdir[5] if flags & 0x800: # UTF-8 file names extension filename = filename.decode('utf-8') else: # Historical ZIP filename encoding filename = filename.decode('cp437') # Create ZipInfo instance to store file information x = ZipInfo(filename) x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH]) x.comment = fp.read(centdir[_CD_COMMENT_LENGTH]) x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET] (x.create_version, x.create_system, x.extract_version, x.reserved, x.flag_bits, x.compress_type, t, d, x.CRC, x.compress_size, x.file_size) = centdir[1:12] if x.extract_version > MAX_EXTRACT_VERSION: raise NotImplementedError("zip file version %.1f" % (x.extract_version / 10)) x.volume, x.internal_attr, x.external_attr = centdir[15:18] # Convert date/time code to (year, month, day, hour, min, sec) x._raw_time = t x.date_time = ((d >> 9)+1980, (d >> 5) & 0xF, d & 0x1F, t >> 11, (t >> 5) & 0x3F, (t & 0x1F) * 2) x._decodeExtra() x.header_offset = x.header_offset + concat self.filelist.append(x) self.NameToInfo[x.filename] = x # update total bytes read from central directory total = (total + sizeCentralDir + centdir[_CD_FILENAME_LENGTH] + centdir[_CD_EXTRA_FIELD_LENGTH] + centdir[_CD_COMMENT_LENGTH]) if self.debug > 2: print("total", total) def namelist(self): """Return a list of file names in the archive.""" return [data.filename for data in self.filelist] def infolist(self): """Return a list of class ZipInfo instances for files in the archive.""" return self.filelist def printdir(self, file=None): """Print a table of contents for the zip file.""" print("%-46s %19s %12s" % ("File Name", "Modified ", "Size"), file=file) for zinfo in self.filelist: date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time[:6] print("%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size), file=file) def testzip(self): """Read all the files and check the CRC.""" chunk_size = 2 ** 20 for zinfo in self.filelist: try: # Read by chunks, to avoid an OverflowError or a # MemoryError with very large embedded files. with self.open(zinfo.filename, "r") as f: while f.read(chunk_size): # Check CRC-32 pass except BadZipFile: return zinfo.filename def getinfo(self, name): """Return the instance of ZipInfo given 'name'.""" info = self.NameToInfo.get(name) if info is None: raise KeyError( 'There is no item named %r in the archive' % name) return info def setpassword(self, pwd): """Set default password for encrypted files.""" if pwd and not isinstance(pwd, bytes): raise TypeError("pwd: expected bytes, got %s" % type(pwd).__name__) if pwd: self.pwd = pwd else: self.pwd = None @property def comment(self): """The comment text associated with the ZIP file.""" return self._comment @comment.setter def comment(self, comment): if not isinstance(comment, bytes): raise TypeError("comment: expected bytes, got %s" % type(comment).__name__) # check for valid comment length if len(comment) > ZIP_MAX_COMMENT: import warnings warnings.warn('Archive comment is too long; truncating to %d bytes' % ZIP_MAX_COMMENT, stacklevel=2) comment = comment[:ZIP_MAX_COMMENT] self._comment = comment self._didModify = True def read(self, name, pwd=None): """Return file bytes (as a string) for name.""" with self.open(name, "r", pwd) as fp: return fp.read() def open(self, name, mode="r", pwd=None, *, force_zip64=False): """Return file-like object for 'name'. name is a string for the file name within the ZIP file, or a ZipInfo object. mode should be 'r' to read a file already in the ZIP file, or 'w' to write to a file newly added to the archive. pwd is the password to decrypt files (only used for reading). When writing, if the file size is not known in advance but may exceed 2 GiB, pass force_zip64 to use the ZIP64 format, which can handle large files. If the size is known in advance, it is best to pass a ZipInfo instance for name, with zinfo.file_size set. """ if mode not in {"r", "w"}: raise ValueError('open() requires mode "r" or "w"') if pwd and not isinstance(pwd, bytes): raise TypeError("pwd: expected bytes, got %s" % type(pwd).__name__) if pwd and (mode == "w"): raise ValueError("pwd is only supported for reading files") if not self.fp: raise ValueError( "Attempt to use ZIP archive that was already closed") # Make sure we have an info object if isinstance(name, ZipInfo): # 'name' is already an info object zinfo = name elif mode == 'w': zinfo = ZipInfo(name) zinfo.compress_type = self.compression else: # Get info object for name zinfo = self.getinfo(name) if mode == 'w': return self._open_to_write(zinfo, force_zip64=force_zip64) if self._writing: raise ValueError("Can't read from the ZIP file while there " "is an open writing handle on it. " "Close the writing handle before trying to read.") # Open for reading: self._fileRefCnt += 1 zef_file = _SharedFile(self.fp, zinfo.header_offset, self._fpclose, self._lock, lambda: self._writing) try: # Skip the file header: fheader = zef_file.read(sizeFileHeader) if len(fheader) != sizeFileHeader: raise BadZipFile("Truncated file header") fheader = struct.unpack(structFileHeader, fheader) if fheader[_FH_SIGNATURE] != stringFileHeader: raise BadZipFile("Bad magic number for file header") fname = zef_file.read(fheader[_FH_FILENAME_LENGTH]) if fheader[_FH_EXTRA_FIELD_LENGTH]: zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH]) if zinfo.flag_bits & 0x20: # Zip 2.7: compressed patched data raise NotImplementedError( "compressed patched data (flag bit 5)") if zinfo.flag_bits & 0x40: # strong encryption raise NotImplementedError("strong encryption (flag bit 6)") if zinfo.flag_bits & 0x800: # UTF-8 filename fname_str = fname.decode("utf-8") else: fname_str = fname.decode("cp437") if fname_str != zinfo.orig_filename: raise BadZipFile( 'File name in directory %r and header %r differ.' % (zinfo.orig_filename, fname)) # check for encrypted flag & handle password is_encrypted = zinfo.flag_bits & 0x1 zd = None if is_encrypted: if not pwd: pwd = self.pwd if not pwd: raise RuntimeError("File %r is encrypted, password " "required for extraction" % name) zd = _ZipDecrypter(pwd) # The first 12 bytes in the cypher stream is an encryption header # used to strengthen the algorithm. The first 11 bytes are # completely random, while the 12th contains the MSB of the CRC, # or the MSB of the file time depending on the header type # and is used to check the correctness of the password. header = zef_file.read(12) h = zd(header[0:12]) if zinfo.flag_bits & 0x8: # compare against the file type from extended local headers check_byte = (zinfo._raw_time >> 8) & 0xff else: # compare against the CRC otherwise check_byte = (zinfo.CRC >> 24) & 0xff if h[11] != check_byte: raise RuntimeError("Bad password for file %r" % name) return ZipExtFile(zef_file, mode, zinfo, zd, True) except: zef_file.close() raise def _open_to_write(self, zinfo, force_zip64=False): if force_zip64 and not self._allowZip64: raise ValueError( "force_zip64 is True, but allowZip64 was False when opening " "the ZIP file." ) if self._writing: raise ValueError("Can't write to the ZIP file while there is " "another write handle open on it. " "Close the first handle before opening another.") # Sizes and CRC are overwritten with correct data after processing the file if not hasattr(zinfo, 'file_size'): zinfo.file_size = 0 zinfo.compress_size = 0 zinfo.CRC = 0 zinfo.flag_bits = 0x00 if zinfo.compress_type == ZIP_LZMA: # Compressed data includes an end-of-stream (EOS) marker zinfo.flag_bits |= 0x02 if not self._seekable: zinfo.flag_bits |= 0x08 if not zinfo.external_attr: zinfo.external_attr = 0o600 << 16 # permissions: ?rw------- # Compressed size can be larger than uncompressed size zip64 = self._allowZip64 and \ (force_zip64 or zinfo.file_size * 1.05 > ZIP64_LIMIT) if self._seekable: self.fp.seek(self.start_dir) zinfo.header_offset = self.fp.tell() self._writecheck(zinfo) self._didModify = True self.fp.write(zinfo.FileHeader(zip64)) self._writing = True return _ZipWriteFile(self, zinfo, zip64) def extract(self, member, path=None, pwd=None): """Extract a member from the archive to the current working directory, using its full name. Its file information is extracted as accurately as possible. `member' may be a filename or a ZipInfo object. You can specify a different directory using `path'. """ if path is None: path = os.getcwd() else: path = os.fspath(path) return self._extract_member(member, path, pwd) def extractall(self, path=None, members=None, pwd=None): """Extract all members from the archive to the current working directory. `path' specifies a different directory to extract to. `members' is optional and must be a subset of the list returned by namelist(). """ if members is None: members = self.namelist() if path is None: path = os.getcwd() else: path = os.fspath(path) for zipinfo in members: self._extract_member(zipinfo, path, pwd) @classmethod def _sanitize_windows_name(cls, arcname, pathsep): """Replace bad characters and remove trailing dots from parts.""" table = cls._windows_illegal_name_trans_table if not table: illegal = ':<>|"?*' table = str.maketrans(illegal, '_' * len(illegal)) cls._windows_illegal_name_trans_table = table arcname = arcname.translate(table) # remove trailing dots arcname = (x.rstrip('.') for x in arcname.split(pathsep)) # rejoin, removing empty parts. arcname = pathsep.join(x for x in arcname if x) return arcname def _extract_member(self, member, targetpath, pwd): """Extract the ZipInfo object 'member' to a physical file on the path targetpath. """ if not isinstance(member, ZipInfo): member = self.getinfo(member) # build the destination pathname, replacing # forward slashes to platform specific separators. arcname = member.filename.replace('/', os.path.sep) if os.path.altsep: arcname = arcname.replace(os.path.altsep, os.path.sep) # interpret absolute pathname as relative, remove drive letter or # UNC path, redundant separators, "." and ".." components. arcname = os.path.splitdrive(arcname)[1] invalid_path_parts = ('', os.path.curdir, os.path.pardir) arcname = os.path.sep.join(x for x in arcname.split(os.path.sep) if x not in invalid_path_parts) if os.path.sep == '\\': # filter illegal characters on Windows arcname = self._sanitize_windows_name(arcname, os.path.sep) targetpath = os.path.join(targetpath, arcname) targetpath = os.path.normpath(targetpath) # Create all upper directories if necessary. upperdirs = os.path.dirname(targetpath) if upperdirs and not os.path.exists(upperdirs): os.makedirs(upperdirs) if member.is_dir(): if not os.path.isdir(targetpath): os.mkdir(targetpath) return targetpath with self.open(member, pwd=pwd) as source, \ open(targetpath, "wb") as target: shutil.copyfileobj(source, target) return targetpath def _writecheck(self, zinfo): """Check for errors before writing a file to the archive.""" if zinfo.filename in self.NameToInfo: import warnings warnings.warn('Duplicate name: %r' % zinfo.filename, stacklevel=3) if self.mode not in ('w', 'x', 'a'): raise ValueError("write() requires mode 'w', 'x', or 'a'") if not self.fp: raise ValueError( "Attempt to write ZIP archive that was already closed") _check_compression(zinfo.compress_type) if not self._allowZip64: requires_zip64 = None if len(self.filelist) >= ZIP_FILECOUNT_LIMIT: requires_zip64 = "Files count" elif zinfo.file_size > ZIP64_LIMIT: requires_zip64 = "Filesize" elif zinfo.header_offset > ZIP64_LIMIT: requires_zip64 = "Zipfile size" if requires_zip64: raise LargeZipFile(requires_zip64 + " would require ZIP64 extensions") def write(self, filename, arcname=None, compress_type=None): """Put the bytes from filename into the archive under the name arcname.""" if not self.fp: raise ValueError( "Attempt to write to ZIP archive that was already closed") if self._writing: raise ValueError( "Can't write to ZIP archive while an open writing handle exists" ) zinfo = ZipInfo.from_file(filename, arcname) if zinfo.is_dir(): zinfo.compress_size = 0 zinfo.CRC = 0 else: if compress_type is not None: zinfo.compress_type = compress_type else: zinfo.compress_type = self.compression if zinfo.is_dir(): with self._lock: if self._seekable: self.fp.seek(self.start_dir) zinfo.header_offset = self.fp.tell() # Start of header bytes if zinfo.compress_type == ZIP_LZMA: # Compressed data includes an end-of-stream (EOS) marker zinfo.flag_bits |= 0x02 self._writecheck(zinfo) self._didModify = True self.filelist.append(zinfo) self.NameToInfo[zinfo.filename] = zinfo self.fp.write(zinfo.FileHeader(False)) self.start_dir = self.fp.tell() else: with open(filename, "rb") as src, self.open(zinfo, 'w') as dest: shutil.copyfileobj(src, dest, 1024*8) def writestr(self, zinfo_or_arcname, data, compress_type=None): """Write a file into the archive. The contents is 'data', which may be either a 'str' or a 'bytes' instance; if it is a 'str', it is encoded as UTF-8 first. 'zinfo_or_arcname' is either a ZipInfo instance or the name of the file in the archive.""" if isinstance(data, str): data = data.encode("utf-8") if not isinstance(zinfo_or_arcname, ZipInfo): zinfo = ZipInfo(filename=zinfo_or_arcname, date_time=time.localtime(time.time())[:6]) zinfo.compress_type = self.compression if zinfo.filename[-1] == '/': zinfo.external_attr = 0o40775 << 16 # drwxrwxr-x zinfo.external_attr |= 0x10 # MS-DOS directory flag else: zinfo.external_attr = 0o600 << 16 # ?rw------- else: zinfo = zinfo_or_arcname if not self.fp: raise ValueError( "Attempt to write to ZIP archive that was already closed") if self._writing: raise ValueError( "Can't write to ZIP archive while an open writing handle exists." ) if compress_type is not None: zinfo.compress_type = compress_type zinfo.file_size = len(data) # Uncompressed size with self._lock: with self.open(zinfo, mode='w') as dest: dest.write(data) def __del__(self): """Call the "close()" method in case the user forgot.""" self.close() def close(self): """Close the file, and for mode 'w', 'x' and 'a' write the ending records.""" if self.fp is None: return if self._writing: raise ValueError("Can't close the ZIP file while there is " "an open writing handle on it. " "Close the writing handle before closing the zip.") try: if self.mode in ('w', 'x', 'a') and self._didModify: # write ending records with self._lock: if self._seekable: self.fp.seek(self.start_dir) self._write_end_record() finally: fp = self.fp self.fp = None self._fpclose(fp) def _write_end_record(self): for zinfo in self.filelist: # write central directory 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 > ZIP64_LIMIT \ or zinfo.compress_size > 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 > 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( '<HH' + 'Q'*len(extra), 1, 8*len(extra), *extra) + extra_data min_version = ZIP64_VERSION if zinfo.compress_type == ZIP_BZIP2: min_version = max(BZIP2_VERSION, min_version) elif zinfo.compress_type == ZIP_LZMA: min_version = max(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 self.fp.write(centdir) self.fp.write(filename) self.fp.write(extra_data) self.fp.write(zinfo.comment) pos2 = self.fp.tell() # Write end-of-zip-archive record centDirCount = len(self.filelist) centDirSize = pos2 - self.start_dir centDirOffset = self.start_dir requires_zip64 = None if centDirCount > ZIP_FILECOUNT_LIMIT: requires_zip64 = "Files count" elif centDirOffset > ZIP64_LIMIT: requires_zip64 = "Central directory offset" elif centDirSize > ZIP64_LIMIT: requires_zip64 = "Central directory size" if requires_zip64: # Need to write the ZIP64 end-of-archive records if not self._allowZip64: raise LargeZipFile(requires_zip64 + " would require ZIP64 extensions") zip64endrec = struct.pack( structEndArchive64, stringEndArchive64, 44, 45, 45, 0, 0, centDirCount, centDirCount, centDirSize, centDirOffset) self.fp.write(zip64endrec) zip64locrec = struct.pack( structEndArchive64Locator, stringEndArchive64Locator, 0, pos2, 1) 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)) self.fp.write(endrec) self.fp.write(self._comment) self.fp.flush() def _fpclose(self, fp): assert self._fileRefCnt > 0 self._fileRefCnt -= 1 if not self._fileRefCnt and not self._filePassed: fp.close() class PyZipFile(ZipFile): """Class to create ZIP archives with Python library files and packages.""" def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=True, optimize=-1): ZipFile.__init__(self, file, mode=mode, compression=compression, allowZip64=allowZip64) self._optimize = optimize def writepy(self, pathname, basename="", filterfunc=None): """Add all files from "pathname" to the ZIP archive. If pathname is a package directory, search the directory and all package subdirectories recursively for all *.py and enter the modules into the archive. If pathname is a plain directory, listdir *.py and enter all modules. Else, pathname must be a Python *.py file and the module will be put into the archive. Added modules are always module.pyc. This method will compile the module.py into module.pyc if necessary. If filterfunc(pathname) is given, it is called with every argument. When it is False, the file or directory is skipped. """ pathname = os.fspath(pathname) if filterfunc and not filterfunc(pathname): if self.debug: label = 'path' if os.path.isdir(pathname) else 'file' print('%s %r skipped by filterfunc' % (label, pathname)) return dir, name = os.path.split(pathname) if os.path.isdir(pathname): initname = os.path.join(pathname, "__init__.py") if os.path.isfile(initname): # This is a package directory, add it if basename: basename = "%s/%s" % (basename, name) else: basename = name if self.debug: print("Adding package in", pathname, "as", basename) fname, arcname = self._get_codename(initname[0:-3], basename) if self.debug: print("Adding", arcname) self.write(fname, arcname) dirlist = os.listdir(pathname) dirlist.remove("__init__.py") # Add all *.py files and package subdirectories for filename in dirlist: path = os.path.join(pathname, filename) root, ext = os.path.splitext(filename) if os.path.isdir(path): if os.path.isfile(os.path.join(path, "__init__.py")): # This is a package directory, add it self.writepy(path, basename, filterfunc=filterfunc) # Recursive call elif ext == ".py": if filterfunc and not filterfunc(path): if self.debug: print('file %r skipped by filterfunc' % path) continue fname, arcname = self._get_codename(path[0:-3], basename) if self.debug: print("Adding", arcname) self.write(fname, arcname) else: # This is NOT a package directory, add its files at top level if self.debug: print("Adding files from directory", pathname) for filename in os.listdir(pathname): path = os.path.join(pathname, filename) root, ext = os.path.splitext(filename) if ext == ".py": if filterfunc and not filterfunc(path): if self.debug: print('file %r skipped by filterfunc' % path) continue fname, arcname = self._get_codename(path[0:-3], basename) if self.debug: print("Adding", arcname) self.write(fname, arcname) else: if pathname[-3:] != ".py": raise RuntimeError( 'Files added with writepy() must end with ".py"') fname, arcname = self._get_codename(pathname[0:-3], basename) if self.debug: print("Adding file", arcname) self.write(fname, arcname) def _get_codename(self, pathname, basename): """Return (filename, archivename) for the path. Given a module name path, return the correct file path and archive name, compiling if necessary. For example, given /python/lib/string, return (/python/lib/string.pyc, string). """ def _compile(file, optimize=-1): import py_compile if self.debug: print("Compiling", file) try: py_compile.compile(file, doraise=True, optimize=optimize) except py_compile.PyCompileError as err: print(err.msg) return False return True file_py = pathname + ".py" file_pyc = pathname + ".pyc" pycache_opt0 = importlib.util.cache_from_source( file_py, optimization='') pycache_opt1 = importlib.util.cache_from_source( file_py, optimization=1) pycache_opt2 = importlib.util.cache_from_source( file_py, optimization=2) if self._optimize == -1: # legacy mode: use whatever file is present if (os.path.isfile(file_pyc) and os.stat(file_pyc).st_mtime >= os.stat(file_py).st_mtime): # Use .pyc file. arcname = fname = file_pyc elif (os.path.isfile(pycache_opt0) and os.stat(pycache_opt0).st_mtime >= os.stat(file_py).st_mtime): # Use the __pycache__/*.pyc file, but write it to the legacy pyc # file name in the archive. fname = pycache_opt0 arcname = file_pyc elif (os.path.isfile(pycache_opt1) and os.stat(pycache_opt1).st_mtime >= os.stat(file_py).st_mtime): # Use the __pycache__/*.pyc file, but write it to the legacy pyc # file name in the archive. fname = pycache_opt1 arcname = file_pyc elif (os.path.isfile(pycache_opt2) and os.stat(pycache_opt2).st_mtime >= os.stat(file_py).st_mtime): # Use the __pycache__/*.pyc file, but write it to the legacy pyc # file name in the archive. fname = pycache_opt2 arcname = file_pyc else: # Compile py into PEP 3147 pyc file. if _compile(file_py): if sys.flags.optimize == 0: fname = pycache_opt0 elif sys.flags.optimize == 1: fname = pycache_opt1 else: fname = pycache_opt2 arcname = file_pyc else: fname = arcname = file_py else: # new mode: use given optimization level if self._optimize == 0: fname = pycache_opt0 arcname = file_pyc else: arcname = file_pyc if self._optimize == 1: fname = pycache_opt1 elif self._optimize == 2: fname = pycache_opt2 else: msg = "invalid value for 'optimize': {!r}".format( self._optimize) raise ValueError(msg) if not (os.path.isfile(fname) and os.stat(fname).st_mtime >= os.stat(file_py).st_mtime): if not _compile(file_py, optimize=self._optimize): fname = arcname = file_py archivename = os.path.split(arcname)[1] if basename: archivename = "%s/%s" % (basename, archivename) return (fname, archivename) def main(args=None): import argparse description = 'A simple command-line interface for zipfile module.' parser = argparse.ArgumentParser(description=description) group = parser.add_mutually_exclusive_group(required=True) group.add_argument('-l', '--list', metavar='<zipfile>', help='Show listing of a zipfile') group.add_argument('-e', '--extract', nargs=2, metavar=('<zipfile>', '<output_dir>'), help='Extract zipfile into target dir') group.add_argument('-c', '--create', nargs='+', metavar=('<name>', '<file>'), help='Create zipfile from sources') group.add_argument('-t', '--test', metavar='<zipfile>', help='Test if a zipfile is valid') args = parser.parse_args(args) if args.test is not None: src = args.test with ZipFile(src, 'r') as zf: badfile = zf.testzip() if badfile: print( "The following enclosed file is corrupted: {!r}".format(badfile)) print("Done testing") elif args.list is not None: src = args.list with ZipFile(src, 'r') as zf: zf.printdir() elif args.extract is not None: src, curdir = args.extract with ZipFile(src, 'r') as zf: zf.extractall(curdir) elif args.create is not None: zip_name = args.create.pop(0) files = args.create def addToZip(zf, path, zippath): if os.path.isfile(path): zf.write(path, zippath, ZIP_DEFLATED) elif os.path.isdir(path): if zippath: zf.write(path, zippath) for nm in os.listdir(path): addToZip(zf, os.path.join(path, nm), os.path.join(zippath, nm)) # else: ignore with ZipFile(zip_name, 'w') as zf: for path in files: zippath = os.path.basename(path) if not zippath: zippath = os.path.basename(os.path.dirname(path)) if zippath in ('', os.curdir, os.pardir): zippath = '' addToZip(zf, path, zippath) if __name__ == "__main__": main()
步骤二：创建OSS触发器
在函数详情页面，选择配置页签，然后在左侧导航栏，选择触发器页签。
在触发器页面，单击创建触发器，在创建触发器面板，选择对象存储OSS触发器类型，按需设置配置项，然后单击确定。
重要配置项说明如下，其余配置项的说明请参见配置原生OSS触发器。
Bucket 名称选择已创建的存储空间名称。
设置文件前缀，本文示例为
src。设置文件后缀，本文示例为
zip。选择触发事件，本文示例为
oss:ObjectCreated:PutObject, oss:ObjectCreated:PostObject, oss:ObjectCreated:CompleteMultipartUpload, oss:ObjectCreated:PutSymlink。角色名称：选择角色名称，请确保该角色拥有调用函数的权限，您可以为该角色授予AliyunFCFullAccess权限策略。
创建完成后，您可以在触发器页面查看已创建的OSS触发器。
步骤三：测试验证
您可以通过以下两种方式测试验证结果。
方式一：通过控制台手动上传文件验证
登录对象存储控制台，在步骤二：创建OSS触发器时选择的Bucket的src目录下上传ZIP文件，例如code.zip。上传成功后，将自动触发函数执行，解压ZIP文件到Bucket的根目录。
方式二：通过配置触发器的event参数测试验证
event参数配置完成后，您需要手动单击测试函数触发函数执行，然后登录对象存储控制台，查看目标Bucket的文件列表，确认ZIP文件是否已成功解压。具体操作步骤如下。
在函数详情页面，单击代码页签，然后单击测试函数右侧
图标，从下拉列表中，选择配置测试参数。在配置测试参数面板，选择事件模板，填写事件名称和event内容，然后单击确定。
event示例如下。
{ "events": [ { "eventName": "ObjectCreated:PutObject", "eventSource": "acs:oss", "eventTime": "2023-08-13T06:45:43.000Z", "eventVersion": "1.0", "oss": { "bucket": { "arn": "acs:oss:cn-hangzhou:10343546824****:bucket****", "name": "bucket****", "ownerIdentity": "10343546824****" }, "object": { "deltaSize": 122539, "eTag": "688A7BF4F233DC9C88A80BF985AB****", "key": "src/test.zip", "size": 122539 }, "ossSchemaVersion": "1.0", "ruleId": "9adac8e253828f4f7c0466d941fa3db81161****" }, "region": "cn-hangzhou", "requestParameters": { "sourceIPAddress": "140.205.XX.XX" }, "responseElements": { "requestId": "58F9FF2D3DF792092E12044C" }, "userIdentity": { "principalId": "10343546824****" } } ] }event参数中不同属性字段的解释，请参见配置函数入口参数。
重要以上event内容仅为示例，请根据实际信息修改部分参数，同时，确保配置的Bucket中存在指定的文件（本文示例为
src/test.zip文件），否则无法触发函数执行，或者函数执行会失败。需要根据实际情况修改的参数如下所示：
bucket.arn：示例如acs:oss:<region>:<your_account_id>:<your_bucket>，修改<region>为您创建函数时选择的地域，修改<your_account_id>为您的阿里云账号（主账号）ID，修改<your_bucket>为相同地域下您实际已经创建的Bucket名称。您的阿里云账号ID，可在函数计算控制台的概览页面的常用信息区域获取。bucket.name：修改为相同地域下您实际已经创建的Bucket名称。bucket.ownerIdentity：修改为您的阿里云账号ID。object.key：修改为您实际已经上传到目标Bucket下的文件。region：修改为您创建函数时选择的地域。userIdentity.principalId：修改为您的阿里云账号ID。
单击代码页签的测试函数进行测试。
执行成功后，登录对象存储控制台，查看目标Bucket下目标ZIP文件（本文示例为
src/test.zip）是否已被解压。具体操作，请参见通过OSS控制台查询文件。
测试完成后，如果您暂时不需要使用此应用，请及时删除应用以及关联的其他资源。
相关文档
如果需要使用OSS触发器实现更多功能，请参见OSS触发器概述。
如果需要使用函数计算实现打包下载OSS的文件，请参见使用函数计算打包下载OSS文件。
如果需要了解本文中提到的对象存储相关的操作，请参见存储空间（Bucket）和对象/文件（Object）。
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