Warning

This document is for an old release of Galaxy. You can alternatively view this page in the latest release if it exists or view the top of the latest release's documentation.

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))