Source code for galaxy.util.zipstream

import os
import zlib
from urllib.parse import quote

import zipstream

from .path import safe_walk

CRC32_MIN = 1444
CRC32_MAX = 1459


[docs]class ZipstreamWrapper:
[docs] def __init__(self, archive_name=None, upstream_mod_zip=False, upstream_gzip=False): self.upstream_mod_zip = upstream_mod_zip self.archive_name = archive_name if not self.upstream_mod_zip: self.archive = zipstream.ZipFile( allowZip64=True, compression=zipstream.ZIP_STORED if upstream_gzip else zipstream.ZIP_DEFLATED ) self.files = [] self.directories = set() self.size = 0
[docs] def response(self): if self.upstream_mod_zip: dir_lines = [f"0 0 @directory {directory}" for directory in self.directories] yield "\n".join(dir_lines + self.files).encode() else: yield from iter(self.archive)
[docs] def get_headers(self): headers = {} if self.archive_name: headers["Content-Disposition"] = f'attachment; filename="{self.archive_name}.zip"' if self.upstream_mod_zip: headers["X-Archive-Files"] = "zip" else: headers["Content-Type"] = "application/x-zip-compressed" return headers
[docs] def add_path(self, path, archive_name): size = int(os.stat(path).st_size) if self.upstream_mod_zip: # calculating crc32 would defeat the point of using mod-zip, but if we ever calculate hashsums we should consider this crc32 = "-" # We do have to calculate the crc32 for files that are between 1444 and 1459 bytes in size, xref: https://github.com/evanmiller/mod_zip/issues/44#issuecomment-656660686 # Oddly that seems to be only true for usegalaxy.org (nginx version 1.12.2), and works fine locally (nginx 1.19.10). # May have been fixed in nginx 1.17.0 if CRC32_MIN <= os.path.getsize(path) <= CRC32_MAX: with open(path, "rb") as contents: crc32 = hex(zlib.crc32(contents.read()))[2:] line = f"{crc32} {size} {quote(path)} {archive_name}" head, tail = os.path.split(archive_name) if head: self.directories.add(head) self.files.append(line) else: self.size += size self.archive.write(path, archive_name)
[docs] def write(self, path, archive_name=None): if os.path.isdir(path): pardir = os.path.join(path, os.pardir) for root, directories, files in safe_walk(path): for directory in directories: dir_path = os.path.join(root, directory) self.add_path(dir_path, os.path.relpath(dir_path, pardir)) for file in files: file_path = os.path.join(root, file) self.add_path(file_path, os.path.relpath(file_path, pardir)) else: self.add_path(path, archive_name or os.path.basename(path))