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#-*- coding:utf-8 -*-
"""Mirrorselect 2.x
Tool for selecting Gentoo source and rsync mirrors.
Copyright 2005-2012 Gentoo Foundation
Copyright (C) 2005 Colin Kingsley <tercel@gentoo.org>
Copyright (C) 2008 Zac Medico <zmedico@gentoo.org>
Copyright (C) 2009 Sebastian Pipping <sebastian@pipping.org>
Copyright (C) 2009 Christian Ruppert <idl0r@gentoo.org>
Copyright (C) 2012 Brian Dolbec <dolsen@gentoo.org>
Distributed under the terms of the GNU General Public License v2
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
"""
import sys
import os
VERIFY_SSL = False
VERIFY_MSGS = []
import requests
from requests.exceptions import SSLError
# py3.2
if sys.hexversion >= 0x30200f0:
VERIFY_SSL = True
else:
try: # import and enable SNI support for py2
from requests.packages.urllib3.contrib import pyopenssl
pyopenssl.inject_into_urllib3()
VERIFY_SSL = True
VERIFY_MSGS = ["Successfully enabled ssl certificate verification."]
except ImportError as e:
VERIFY_MSGS = [
"Failed to import and inject pyopenssl/SNI support into urllib3",
"Disabling certificate verification",
"Error was:" + e
]
VERIFY_SSL = False
from mirrorselect.version import version
class Connector(object):
"""Primary connection interface using the dev-python/requests package
"""
def __init__(self, output, proxies):
self.output = output
self.proxies = proxies
self.headers = {'Accept-Charset': 'utf-8',
'User-Agent': 'Mirrorselect-' + version}
if VERIFY_MSGS:
for msg in VERIFY_MSGS:
self.output.write(msg + '\n', 2)
def add_timestamp(self, headers, tpath=None, timestamp=None):
"""for possilble future caching of the list"""
if tpath and os.path.exists(tpath):
# fileopen is a layman comaptibility function not yet implemented here
with fileopen(tpath,'r') as previous:
timestamp = previous.read()
if timestamp:
headers['If-Modified-Since'] = timestamp
self.output.write('Current-modified: %s\n' % timestamp, 2)
return headers
def fetch_url(self, url, headers=None, timestamp=None):
"""Fetches the url
@param url: string
@param headers: dictionary, optional headers to use
@param tpath: string, optional filepath to a timestamp file
to use in the headers
@param timestamp: string, optional timestamp to use in the headers
"""
if not headers:
headers = self.headers
if timestamp:
self.add_timestamp(headers, timestamp=timestamp)
verify = 'https' in url and VERIFY_SSL
self.output.write("Enabled ssl certificate verification: %s, for: %s\n"
%(str(verify), url), 3)
self.output.write('Connector.fetch_url(); headers = %s\n' %str(headers), 4)
self.output.write('Connector.fetch_url(); connecting to opener\n', 2)
try:
connection = requests.get(
url,
headers=headers,
verify=verify,
proxies=self.proxies,
)
except SSLError as error:
self.output.print_err('Connector.fetch_url(); Failed to update the '
'mirror list from: %s\nSSLError was:%s\n'
% (url, str(error)))
except Exception as error:
self.output.print_err('Connector.fetch_url(); Failed to retrieve '
'the content from: %s\nError was: %s\n'
% (url, str(error)))
self.output.write('Connector.fetch_url() HEADERS = %s\n' %str(connection.headers), 4)
self.output.write('Connector.fetch_url() Status_code = %i\n' % connection.status_code, 2)
return connection
@staticmethod
def normalize_headers(headers, to_lower=True):
""" py2, py3 compatibility function, since only py2 returns keys as lower()
"""
if to_lower:
return dict((x.lower(), x) for x in list(headers))
return dict((x.upper(), x) for x in list(headers))
def fetch_content(self, url, tpath=None):
"""Fetch the mirror list
@param url: string of the content to fetch
@param headers: dictionary, optional headers to use
@param tpath: string, optional filepath to a timestamp file
to use in the headers
@returns (success bool, content fetched , timestamp of fetched content,
content headers returned)
"""
fheaders = self.headers
if tpath:
fheaders = self.add_timestamp(fheaders, tpath)
connection = self.fetch_url(url, fheaders)
headers = self.normalize_headers(connection.headers)
if 'last-modified' in headers:
timestamp = headers['last-modified']
elif 'date' in headers:
timestamp = headers['date']
else:
timestamp = None
if connection.status_code in [304]:
self.output.write('Content already up to date: %s\n'
% url, 4)
self.output.write('Last-modified: %s\n' % timestamp, 4)
elif connection.status_code not in [200]:
self.output.print_err('Connector.fetch_content(); HTTP Status-Code was:\n'
'url: %s\n%s'
% (url, str(connection.status_code)))
if connection.status_code in [200]:
self.output.write('New content downloaded for: %s\n'
% url, 4)
return (True, connection.content, timestamp)
return (False, '', '')
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