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# Copyright (C) 2014 Codethink Limited
#
# 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
import json
import os
import urllib
import urllib2
def build_proxy_url(protocol, proxy_config):
"""Build a proxy URL from data in our proxy configuration format."""
hostname = urllib.quote(proxy_config['hostname'])
url = '%s:%s' % (hostname, proxy_config['port'])
if 'username' not in proxy_config:
return '%s://%s/' % (protocol, url)
elif 'password' not in proxy_config:
return '%s://%s@%s/' % (protocol, proxy_config['username'], url)
else:
return '%s://%s:%s@%s/' % (protocol, proxy_config['username'],
proxy_config['password'], url)
def setup_proxy(config_filename):
"""Tell urllib2 to use a proxy for http action by lorry-controller.
Load the proxy information from the JSON file given by proxy_def, then
set urllib2's url opener to open urls via an authenticated proxy.
"""
if not os.path.exists(config_filename):
return
with open(config_filename, 'r') as f:
proxy_config = json.load(f)
http_proxy_url = build_proxy_url('http', proxy_config)
https_proxy_url = build_proxy_url('https', proxy_config)
# set the required environment variables
os.environ['http_proxy'] = http_proxy_url
os.environ['https_proxy'] = https_proxy_url
# create a ProxyHandler
proxies = {'http_proxy': http_proxy_url,
'https_proxy': https_proxy_url}
proxy_handler = urllib2.ProxyHandler(proxies)
# install an opener to use the proxy
opener = urllib2.build_opener(proxy_handler)
urllib2.install_opener(opener)
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