896 lines
31 KiB
Python
896 lines
31 KiB
Python
from __future__ import absolute_import
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import cgi
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import email.utils
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import getpass
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import json
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import logging
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import mimetypes
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import os
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import platform
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import re
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import shutil
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import sys
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import tempfile
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try:
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import ssl # noqa
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HAS_TLS = True
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except ImportError:
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HAS_TLS = False
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from pip._vendor.six.moves.urllib import parse as urllib_parse
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from pip._vendor.six.moves.urllib import request as urllib_request
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import pip
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from pip.exceptions import InstallationError, HashMismatch
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from pip.models import PyPI
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from pip.utils import (splitext, rmtree, format_size, display_path,
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backup_dir, ask_path_exists, unpack_file,
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ARCHIVE_EXTENSIONS, consume, call_subprocess)
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from pip.utils.encoding import auto_decode
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from pip.utils.filesystem import check_path_owner
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from pip.utils.logging import indent_log
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from pip.utils.setuptools_build import SETUPTOOLS_SHIM
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from pip.utils.ui import DownloadProgressBar, DownloadProgressSpinner
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from pip.locations import write_delete_marker_file
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from pip.vcs import vcs
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from pip._vendor import requests, six
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from pip._vendor.requests.adapters import BaseAdapter, HTTPAdapter
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from pip._vendor.requests.auth import AuthBase, HTTPBasicAuth
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from pip._vendor.requests.models import CONTENT_CHUNK_SIZE, Response
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from pip._vendor.requests.structures import CaseInsensitiveDict
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from pip._vendor.requests.packages import urllib3
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from pip._vendor.cachecontrol import CacheControlAdapter
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from pip._vendor.cachecontrol.caches import FileCache
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from pip._vendor.lockfile import LockError
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from pip._vendor.six.moves import xmlrpc_client
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__all__ = ['get_file_content',
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'is_url', 'url_to_path', 'path_to_url',
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'is_archive_file', 'unpack_vcs_link',
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'unpack_file_url', 'is_vcs_url', 'is_file_url',
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'unpack_http_url', 'unpack_url']
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logger = logging.getLogger(__name__)
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def user_agent():
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"""
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Return a string representing the user agent.
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"""
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data = {
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"installer": {"name": "pip", "version": pip.__version__},
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"python": platform.python_version(),
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"implementation": {
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"name": platform.python_implementation(),
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},
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}
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if data["implementation"]["name"] == 'CPython':
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data["implementation"]["version"] = platform.python_version()
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elif data["implementation"]["name"] == 'PyPy':
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if sys.pypy_version_info.releaselevel == 'final':
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pypy_version_info = sys.pypy_version_info[:3]
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else:
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pypy_version_info = sys.pypy_version_info
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data["implementation"]["version"] = ".".join(
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[str(x) for x in pypy_version_info]
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)
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elif data["implementation"]["name"] == 'Jython':
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# Complete Guess
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data["implementation"]["version"] = platform.python_version()
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elif data["implementation"]["name"] == 'IronPython':
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# Complete Guess
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data["implementation"]["version"] = platform.python_version()
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if sys.platform.startswith("linux"):
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distro = dict(filter(
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lambda x: x[1],
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zip(["name", "version", "id"], platform.linux_distribution()),
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))
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libc = dict(filter(
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lambda x: x[1],
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zip(["lib", "version"], platform.libc_ver()),
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))
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if libc:
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distro["libc"] = libc
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if distro:
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data["distro"] = distro
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if sys.platform.startswith("darwin") and platform.mac_ver()[0]:
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data["distro"] = {"name": "OS X", "version": platform.mac_ver()[0]}
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if platform.system():
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data.setdefault("system", {})["name"] = platform.system()
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if platform.release():
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data.setdefault("system", {})["release"] = platform.release()
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if platform.machine():
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data["cpu"] = platform.machine()
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# Python 2.6 doesn't have ssl.OPENSSL_VERSION.
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if HAS_TLS and sys.version_info[:2] > (2, 6):
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data["openssl_version"] = ssl.OPENSSL_VERSION
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return "{data[installer][name]}/{data[installer][version]} {json}".format(
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data=data,
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json=json.dumps(data, separators=(",", ":"), sort_keys=True),
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)
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class MultiDomainBasicAuth(AuthBase):
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def __init__(self, prompting=True):
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self.prompting = prompting
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self.passwords = {}
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def __call__(self, req):
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parsed = urllib_parse.urlparse(req.url)
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# Get the netloc without any embedded credentials
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netloc = parsed.netloc.rsplit("@", 1)[-1]
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# Set the url of the request to the url without any credentials
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req.url = urllib_parse.urlunparse(parsed[:1] + (netloc,) + parsed[2:])
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# Use any stored credentials that we have for this netloc
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username, password = self.passwords.get(netloc, (None, None))
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# Extract credentials embedded in the url if we have none stored
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if username is None:
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username, password = self.parse_credentials(parsed.netloc)
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if username or password:
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# Store the username and password
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self.passwords[netloc] = (username, password)
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# Send the basic auth with this request
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req = HTTPBasicAuth(username or "", password or "")(req)
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# Attach a hook to handle 401 responses
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req.register_hook("response", self.handle_401)
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return req
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def handle_401(self, resp, **kwargs):
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# We only care about 401 responses, anything else we want to just
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# pass through the actual response
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if resp.status_code != 401:
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return resp
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# We are not able to prompt the user so simple return the response
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if not self.prompting:
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return resp
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parsed = urllib_parse.urlparse(resp.url)
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# Prompt the user for a new username and password
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username = six.moves.input("User for %s: " % parsed.netloc)
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password = getpass.getpass("Password: ")
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# Store the new username and password to use for future requests
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if username or password:
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self.passwords[parsed.netloc] = (username, password)
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# Consume content and release the original connection to allow our new
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# request to reuse the same one.
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resp.content
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resp.raw.release_conn()
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# Add our new username and password to the request
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req = HTTPBasicAuth(username or "", password or "")(resp.request)
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# Send our new request
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new_resp = resp.connection.send(req, **kwargs)
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new_resp.history.append(resp)
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return new_resp
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def parse_credentials(self, netloc):
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if "@" in netloc:
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userinfo = netloc.rsplit("@", 1)[0]
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if ":" in userinfo:
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return userinfo.split(":", 1)
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return userinfo, None
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return None, None
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class LocalFSAdapter(BaseAdapter):
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def send(self, request, stream=None, timeout=None, verify=None, cert=None,
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proxies=None):
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pathname = url_to_path(request.url)
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resp = Response()
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resp.status_code = 200
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resp.url = request.url
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try:
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stats = os.stat(pathname)
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except OSError as exc:
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resp.status_code = 404
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resp.raw = exc
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else:
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modified = email.utils.formatdate(stats.st_mtime, usegmt=True)
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content_type = mimetypes.guess_type(pathname)[0] or "text/plain"
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resp.headers = CaseInsensitiveDict({
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"Content-Type": content_type,
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"Content-Length": stats.st_size,
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"Last-Modified": modified,
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})
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resp.raw = open(pathname, "rb")
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resp.close = resp.raw.close
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return resp
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def close(self):
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pass
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class SafeFileCache(FileCache):
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"""
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A file based cache which is safe to use even when the target directory may
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not be accessible or writable.
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"""
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def __init__(self, *args, **kwargs):
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super(SafeFileCache, self).__init__(*args, **kwargs)
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# Check to ensure that the directory containing our cache directory
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# is owned by the user current executing pip. If it does not exist
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# we will check the parent directory until we find one that does exist.
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# If it is not owned by the user executing pip then we will disable
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# the cache and log a warning.
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if not check_path_owner(self.directory):
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logger.warning(
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"The directory '%s' or its parent directory is not owned by "
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"the current user and the cache has been disabled. Please "
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"check the permissions and owner of that directory. If "
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"executing pip with sudo, you may want sudo's -H flag.",
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self.directory,
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)
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# Set our directory to None to disable the Cache
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self.directory = None
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def get(self, *args, **kwargs):
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# If we don't have a directory, then the cache should be a no-op.
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if self.directory is None:
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return
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try:
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return super(SafeFileCache, self).get(*args, **kwargs)
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except (LockError, OSError, IOError):
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# We intentionally silence this error, if we can't access the cache
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# then we can just skip caching and process the request as if
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# caching wasn't enabled.
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pass
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def set(self, *args, **kwargs):
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# If we don't have a directory, then the cache should be a no-op.
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if self.directory is None:
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return
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try:
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return super(SafeFileCache, self).set(*args, **kwargs)
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except (LockError, OSError, IOError):
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# We intentionally silence this error, if we can't access the cache
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# then we can just skip caching and process the request as if
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# caching wasn't enabled.
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pass
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def delete(self, *args, **kwargs):
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# If we don't have a directory, then the cache should be a no-op.
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if self.directory is None:
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return
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try:
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return super(SafeFileCache, self).delete(*args, **kwargs)
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except (LockError, OSError, IOError):
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# We intentionally silence this error, if we can't access the cache
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# then we can just skip caching and process the request as if
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# caching wasn't enabled.
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pass
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class InsecureHTTPAdapter(HTTPAdapter):
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def cert_verify(self, conn, url, verify, cert):
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conn.cert_reqs = 'CERT_NONE'
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conn.ca_certs = None
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class PipSession(requests.Session):
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timeout = None
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def __init__(self, *args, **kwargs):
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retries = kwargs.pop("retries", 0)
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cache = kwargs.pop("cache", None)
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insecure_hosts = kwargs.pop("insecure_hosts", [])
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super(PipSession, self).__init__(*args, **kwargs)
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# Attach our User Agent to the request
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self.headers["User-Agent"] = user_agent()
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# Attach our Authentication handler to the session
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self.auth = MultiDomainBasicAuth()
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# Create our urllib3.Retry instance which will allow us to customize
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# how we handle retries.
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retries = urllib3.Retry(
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# Set the total number of retries that a particular request can
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# have.
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total=retries,
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# A 503 error from PyPI typically means that the Fastly -> Origin
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# connection got interupted in some way. A 503 error in general
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# is typically considered a transient error so we'll go ahead and
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# retry it.
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status_forcelist=[503],
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# Add a small amount of back off between failed requests in
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# order to prevent hammering the service.
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backoff_factor=0.25,
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)
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# We want to _only_ cache responses on securely fetched origins. We do
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# this because we can't validate the response of an insecurely fetched
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# origin, and we don't want someone to be able to poison the cache and
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# require manual eviction from the cache to fix it.
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if cache:
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secure_adapter = CacheControlAdapter(
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cache=SafeFileCache(cache, use_dir_lock=True),
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max_retries=retries,
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)
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else:
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secure_adapter = HTTPAdapter(max_retries=retries)
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# Our Insecure HTTPAdapter disables HTTPS validation. It does not
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# support caching (see above) so we'll use it for all http:// URLs as
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# well as any https:// host that we've marked as ignoring TLS errors
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# for.
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insecure_adapter = InsecureHTTPAdapter(max_retries=retries)
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self.mount("https://", secure_adapter)
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self.mount("http://", insecure_adapter)
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# Enable file:// urls
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self.mount("file://", LocalFSAdapter())
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# We want to use a non-validating adapter for any requests which are
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# deemed insecure.
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for host in insecure_hosts:
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self.mount("https://{0}/".format(host), insecure_adapter)
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def request(self, method, url, *args, **kwargs):
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# Allow setting a default timeout on a session
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kwargs.setdefault("timeout", self.timeout)
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# Dispatch the actual request
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return super(PipSession, self).request(method, url, *args, **kwargs)
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def get_file_content(url, comes_from=None, session=None):
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"""Gets the content of a file; it may be a filename, file: URL, or
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http: URL. Returns (location, content). Content is unicode."""
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if session is None:
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raise TypeError(
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"get_file_content() missing 1 required keyword argument: 'session'"
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)
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match = _scheme_re.search(url)
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if match:
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scheme = match.group(1).lower()
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if (scheme == 'file' and comes_from and
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comes_from.startswith('http')):
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raise InstallationError(
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'Requirements file %s references URL %s, which is local'
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% (comes_from, url))
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if scheme == 'file':
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path = url.split(':', 1)[1]
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path = path.replace('\\', '/')
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match = _url_slash_drive_re.match(path)
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if match:
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path = match.group(1) + ':' + path.split('|', 1)[1]
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path = urllib_parse.unquote(path)
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if path.startswith('/'):
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path = '/' + path.lstrip('/')
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url = path
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else:
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# FIXME: catch some errors
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resp = session.get(url)
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resp.raise_for_status()
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return resp.url, resp.text
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try:
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with open(url, 'rb') as f:
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content = auto_decode(f.read())
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except IOError as exc:
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raise InstallationError(
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'Could not open requirements file: %s' % str(exc)
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)
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return url, content
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_scheme_re = re.compile(r'^(http|https|file):', re.I)
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_url_slash_drive_re = re.compile(r'/*([a-z])\|', re.I)
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def is_url(name):
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"""Returns true if the name looks like a URL"""
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if ':' not in name:
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return False
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scheme = name.split(':', 1)[0].lower()
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return scheme in ['http', 'https', 'file', 'ftp'] + vcs.all_schemes
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def url_to_path(url):
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"""
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Convert a file: URL to a path.
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"""
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assert url.startswith('file:'), (
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"You can only turn file: urls into filenames (not %r)" % url)
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_, netloc, path, _, _ = urllib_parse.urlsplit(url)
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# if we have a UNC path, prepend UNC share notation
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if netloc:
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netloc = '\\\\' + netloc
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path = urllib_request.url2pathname(netloc + path)
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return path
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def path_to_url(path):
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"""
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Convert a path to a file: URL. The path will be made absolute and have
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quoted path parts.
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"""
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path = os.path.normpath(os.path.abspath(path))
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url = urllib_parse.urljoin('file:', urllib_request.pathname2url(path))
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return url
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def is_archive_file(name):
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"""Return True if `name` is a considered as an archive file."""
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ext = splitext(name)[1].lower()
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if ext in ARCHIVE_EXTENSIONS:
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return True
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return False
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def unpack_vcs_link(link, location):
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vcs_backend = _get_used_vcs_backend(link)
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vcs_backend.unpack(location)
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def _get_used_vcs_backend(link):
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for backend in vcs.backends:
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if link.scheme in backend.schemes:
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vcs_backend = backend(link.url)
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return vcs_backend
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def is_vcs_url(link):
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return bool(_get_used_vcs_backend(link))
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def is_file_url(link):
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return link.url.lower().startswith('file:')
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def is_dir_url(link):
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"""Return whether a file:// Link points to a directory.
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``link`` must not have any other scheme but file://. Call is_file_url()
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first.
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"""
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link_path = url_to_path(link.url_without_fragment)
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return os.path.isdir(link_path)
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def _progress_indicator(iterable, *args, **kwargs):
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return iterable
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def _download_url(resp, link, content_file, hashes):
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try:
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total_length = int(resp.headers['content-length'])
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except (ValueError, KeyError, TypeError):
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total_length = 0
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cached_resp = getattr(resp, "from_cache", False)
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if logger.getEffectiveLevel() > logging.INFO:
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show_progress = False
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elif cached_resp:
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show_progress = False
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elif total_length > (40 * 1000):
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show_progress = True
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elif not total_length:
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show_progress = True
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else:
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show_progress = False
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show_url = link.show_url
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def resp_read(chunk_size):
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try:
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# Special case for urllib3.
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for chunk in resp.raw.stream(
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chunk_size,
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# We use decode_content=False here because we don't
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# want urllib3 to mess with the raw bytes we get
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# from the server. If we decompress inside of
|
|
# urllib3 then we cannot verify the checksum
|
|
# because the checksum will be of the compressed
|
|
# file. This breakage will only occur if the
|
|
# server adds a Content-Encoding header, which
|
|
# depends on how the server was configured:
|
|
# - Some servers will notice that the file isn't a
|
|
# compressible file and will leave the file alone
|
|
# and with an empty Content-Encoding
|
|
# - Some servers will notice that the file is
|
|
# already compressed and will leave the file
|
|
# alone and will add a Content-Encoding: gzip
|
|
# header
|
|
# - Some servers won't notice anything at all and
|
|
# will take a file that's already been compressed
|
|
# and compress it again and set the
|
|
# Content-Encoding: gzip header
|
|
#
|
|
# By setting this not to decode automatically we
|
|
# hope to eliminate problems with the second case.
|
|
decode_content=False):
|
|
yield chunk
|
|
except AttributeError:
|
|
# Standard file-like object.
|
|
while True:
|
|
chunk = resp.raw.read(chunk_size)
|
|
if not chunk:
|
|
break
|
|
yield chunk
|
|
|
|
def written_chunks(chunks):
|
|
for chunk in chunks:
|
|
content_file.write(chunk)
|
|
yield chunk
|
|
|
|
progress_indicator = _progress_indicator
|
|
|
|
if link.netloc == PyPI.netloc:
|
|
url = show_url
|
|
else:
|
|
url = link.url_without_fragment
|
|
|
|
if show_progress: # We don't show progress on cached responses
|
|
if total_length:
|
|
logger.info("Downloading %s (%s)", url, format_size(total_length))
|
|
progress_indicator = DownloadProgressBar(max=total_length).iter
|
|
else:
|
|
logger.info("Downloading %s", url)
|
|
progress_indicator = DownloadProgressSpinner().iter
|
|
elif cached_resp:
|
|
logger.info("Using cached %s", url)
|
|
else:
|
|
logger.info("Downloading %s", url)
|
|
|
|
logger.debug('Downloading from URL %s', link)
|
|
|
|
downloaded_chunks = written_chunks(
|
|
progress_indicator(
|
|
resp_read(CONTENT_CHUNK_SIZE),
|
|
CONTENT_CHUNK_SIZE
|
|
)
|
|
)
|
|
if hashes:
|
|
hashes.check_against_chunks(downloaded_chunks)
|
|
else:
|
|
consume(downloaded_chunks)
|
|
|
|
|
|
def _copy_file(filename, location, link):
|
|
copy = True
|
|
download_location = os.path.join(location, link.filename)
|
|
if os.path.exists(download_location):
|
|
response = ask_path_exists(
|
|
'The file %s exists. (i)gnore, (w)ipe, (b)ackup ' %
|
|
display_path(download_location), ('i', 'w', 'b'))
|
|
if response == 'i':
|
|
copy = False
|
|
elif response == 'w':
|
|
logger.warning('Deleting %s', display_path(download_location))
|
|
os.remove(download_location)
|
|
elif response == 'b':
|
|
dest_file = backup_dir(download_location)
|
|
logger.warning(
|
|
'Backing up %s to %s',
|
|
display_path(download_location),
|
|
display_path(dest_file),
|
|
)
|
|
shutil.move(download_location, dest_file)
|
|
if copy:
|
|
shutil.copy(filename, download_location)
|
|
logger.info('Saved %s', display_path(download_location))
|
|
|
|
|
|
def unpack_http_url(link, location, download_dir=None,
|
|
session=None, hashes=None):
|
|
if session is None:
|
|
raise TypeError(
|
|
"unpack_http_url() missing 1 required keyword argument: 'session'"
|
|
)
|
|
|
|
temp_dir = tempfile.mkdtemp('-unpack', 'pip-')
|
|
|
|
# If a download dir is specified, is the file already downloaded there?
|
|
already_downloaded_path = None
|
|
if download_dir:
|
|
already_downloaded_path = _check_download_dir(link,
|
|
download_dir,
|
|
hashes)
|
|
|
|
if already_downloaded_path:
|
|
from_path = already_downloaded_path
|
|
content_type = mimetypes.guess_type(from_path)[0]
|
|
else:
|
|
# let's download to a tmp dir
|
|
from_path, content_type = _download_http_url(link,
|
|
session,
|
|
temp_dir,
|
|
hashes)
|
|
|
|
# unpack the archive to the build dir location. even when only downloading
|
|
# archives, they have to be unpacked to parse dependencies
|
|
unpack_file(from_path, location, content_type, link)
|
|
|
|
# a download dir is specified; let's copy the archive there
|
|
if download_dir and not already_downloaded_path:
|
|
_copy_file(from_path, download_dir, link)
|
|
|
|
if not already_downloaded_path:
|
|
os.unlink(from_path)
|
|
rmtree(temp_dir)
|
|
|
|
|
|
def unpack_file_url(link, location, download_dir=None, hashes=None):
|
|
"""Unpack link into location.
|
|
|
|
If download_dir is provided and link points to a file, make a copy
|
|
of the link file inside download_dir.
|
|
"""
|
|
link_path = url_to_path(link.url_without_fragment)
|
|
|
|
# If it's a url to a local directory
|
|
if is_dir_url(link):
|
|
if os.path.isdir(location):
|
|
rmtree(location)
|
|
shutil.copytree(link_path, location, symlinks=True)
|
|
if download_dir:
|
|
logger.info('Link is a directory, ignoring download_dir')
|
|
return
|
|
|
|
# If --require-hashes is off, `hashes` is either empty, the
|
|
# link's embeddded hash, or MissingHashes; it is required to
|
|
# match. If --require-hashes is on, we are satisfied by any
|
|
# hash in `hashes` matching: a URL-based or an option-based
|
|
# one; no internet-sourced hash will be in `hashes`.
|
|
if hashes:
|
|
hashes.check_against_path(link_path)
|
|
|
|
# If a download dir is specified, is the file already there and valid?
|
|
already_downloaded_path = None
|
|
if download_dir:
|
|
already_downloaded_path = _check_download_dir(link,
|
|
download_dir,
|
|
hashes)
|
|
|
|
if already_downloaded_path:
|
|
from_path = already_downloaded_path
|
|
else:
|
|
from_path = link_path
|
|
|
|
content_type = mimetypes.guess_type(from_path)[0]
|
|
|
|
# unpack the archive to the build dir location. even when only downloading
|
|
# archives, they have to be unpacked to parse dependencies
|
|
unpack_file(from_path, location, content_type, link)
|
|
|
|
# a download dir is specified and not already downloaded
|
|
if download_dir and not already_downloaded_path:
|
|
_copy_file(from_path, download_dir, link)
|
|
|
|
|
|
def _copy_dist_from_dir(link_path, location):
|
|
"""Copy distribution files in `link_path` to `location`.
|
|
|
|
Invoked when user requests to install a local directory. E.g.:
|
|
|
|
pip install .
|
|
pip install ~/dev/git-repos/python-prompt-toolkit
|
|
|
|
"""
|
|
|
|
# Note: This is currently VERY SLOW if you have a lot of data in the
|
|
# directory, because it copies everything with `shutil.copytree`.
|
|
# What it should really do is build an sdist and install that.
|
|
# See https://github.com/pypa/pip/issues/2195
|
|
|
|
if os.path.isdir(location):
|
|
rmtree(location)
|
|
|
|
# build an sdist
|
|
setup_py = 'setup.py'
|
|
sdist_args = [sys.executable]
|
|
sdist_args.append('-c')
|
|
sdist_args.append(SETUPTOOLS_SHIM % setup_py)
|
|
sdist_args.append('sdist')
|
|
sdist_args += ['--dist-dir', location]
|
|
logger.info('Running setup.py sdist for %s', link_path)
|
|
|
|
with indent_log():
|
|
call_subprocess(sdist_args, cwd=link_path, show_stdout=False)
|
|
|
|
# unpack sdist into `location`
|
|
sdist = os.path.join(location, os.listdir(location)[0])
|
|
logger.info('Unpacking sdist %s into %s', sdist, location)
|
|
unpack_file(sdist, location, content_type=None, link=None)
|
|
|
|
|
|
class PipXmlrpcTransport(xmlrpc_client.Transport):
|
|
"""Provide a `xmlrpclib.Transport` implementation via a `PipSession`
|
|
object.
|
|
"""
|
|
def __init__(self, index_url, session, use_datetime=False):
|
|
xmlrpc_client.Transport.__init__(self, use_datetime)
|
|
index_parts = urllib_parse.urlparse(index_url)
|
|
self._scheme = index_parts.scheme
|
|
self._session = session
|
|
|
|
def request(self, host, handler, request_body, verbose=False):
|
|
parts = (self._scheme, host, handler, None, None, None)
|
|
url = urllib_parse.urlunparse(parts)
|
|
try:
|
|
headers = {'Content-Type': 'text/xml'}
|
|
response = self._session.post(url, data=request_body,
|
|
headers=headers, stream=True)
|
|
response.raise_for_status()
|
|
self.verbose = verbose
|
|
return self.parse_response(response.raw)
|
|
except requests.HTTPError as exc:
|
|
logger.critical(
|
|
"HTTP error %s while getting %s",
|
|
exc.response.status_code, url,
|
|
)
|
|
raise
|
|
|
|
|
|
def unpack_url(link, location, download_dir=None,
|
|
only_download=False, session=None, hashes=None):
|
|
"""Unpack link.
|
|
If link is a VCS link:
|
|
if only_download, export into download_dir and ignore location
|
|
else unpack into location
|
|
for other types of link:
|
|
- unpack into location
|
|
- if download_dir, copy the file into download_dir
|
|
- if only_download, mark location for deletion
|
|
|
|
:param hashes: A Hashes object, one of whose embedded hashes must match,
|
|
or HashMismatch will be raised. If the Hashes is empty, no matches are
|
|
required, and unhashable types of requirements (like VCS ones, which
|
|
would ordinarily raise HashUnsupported) are allowed.
|
|
"""
|
|
# non-editable vcs urls
|
|
if is_vcs_url(link):
|
|
unpack_vcs_link(link, location)
|
|
|
|
# file urls
|
|
elif is_file_url(link):
|
|
unpack_file_url(link, location, download_dir, hashes=hashes)
|
|
|
|
# http urls
|
|
else:
|
|
if session is None:
|
|
session = PipSession()
|
|
|
|
unpack_http_url(
|
|
link,
|
|
location,
|
|
download_dir,
|
|
session,
|
|
hashes=hashes
|
|
)
|
|
if only_download:
|
|
write_delete_marker_file(location)
|
|
|
|
|
|
def _download_http_url(link, session, temp_dir, hashes):
|
|
"""Download link url into temp_dir using provided session"""
|
|
target_url = link.url.split('#', 1)[0]
|
|
try:
|
|
resp = session.get(
|
|
target_url,
|
|
# We use Accept-Encoding: identity here because requests
|
|
# defaults to accepting compressed responses. This breaks in
|
|
# a variety of ways depending on how the server is configured.
|
|
# - Some servers will notice that the file isn't a compressible
|
|
# file and will leave the file alone and with an empty
|
|
# Content-Encoding
|
|
# - Some servers will notice that the file is already
|
|
# compressed and will leave the file alone and will add a
|
|
# Content-Encoding: gzip header
|
|
# - Some servers won't notice anything at all and will take
|
|
# a file that's already been compressed and compress it again
|
|
# and set the Content-Encoding: gzip header
|
|
# By setting this to request only the identity encoding We're
|
|
# hoping to eliminate the third case. Hopefully there does not
|
|
# exist a server which when given a file will notice it is
|
|
# already compressed and that you're not asking for a
|
|
# compressed file and will then decompress it before sending
|
|
# because if that's the case I don't think it'll ever be
|
|
# possible to make this work.
|
|
headers={"Accept-Encoding": "identity"},
|
|
stream=True,
|
|
)
|
|
resp.raise_for_status()
|
|
except requests.HTTPError as exc:
|
|
logger.critical(
|
|
"HTTP error %s while getting %s", exc.response.status_code, link,
|
|
)
|
|
raise
|
|
|
|
content_type = resp.headers.get('content-type', '')
|
|
filename = link.filename # fallback
|
|
# Have a look at the Content-Disposition header for a better guess
|
|
content_disposition = resp.headers.get('content-disposition')
|
|
if content_disposition:
|
|
type, params = cgi.parse_header(content_disposition)
|
|
# We use ``or`` here because we don't want to use an "empty" value
|
|
# from the filename param.
|
|
filename = params.get('filename') or filename
|
|
ext = splitext(filename)[1]
|
|
if not ext:
|
|
ext = mimetypes.guess_extension(content_type)
|
|
if ext:
|
|
filename += ext
|
|
if not ext and link.url != resp.url:
|
|
ext = os.path.splitext(resp.url)[1]
|
|
if ext:
|
|
filename += ext
|
|
file_path = os.path.join(temp_dir, filename)
|
|
with open(file_path, 'wb') as content_file:
|
|
_download_url(resp, link, content_file, hashes)
|
|
return file_path, content_type
|
|
|
|
|
|
def _check_download_dir(link, download_dir, hashes):
|
|
""" Check download_dir for previously downloaded file with correct hash
|
|
If a correct file is found return its path else None
|
|
"""
|
|
download_path = os.path.join(download_dir, link.filename)
|
|
if os.path.exists(download_path):
|
|
# If already downloaded, does its hash match?
|
|
logger.info('File was already downloaded %s', download_path)
|
|
if hashes:
|
|
try:
|
|
hashes.check_against_path(download_path)
|
|
except HashMismatch:
|
|
logger.warning(
|
|
'Previously-downloaded file %s has bad hash. '
|
|
'Re-downloading.',
|
|
download_path
|
|
)
|
|
os.unlink(download_path)
|
|
return None
|
|
return download_path
|
|
return None
|