setup_proxy.py

import urllib.request, urllib.error, urllib.parse
from ckan.common import config


def setup_proxy():
    '''
    This function declares that a proxy server shall be used to access the web via
    urllib2. It takes the proxy address from ckan's config file 
    (
        field "ckanext.odsh.download_proxy",
        example: ckanext.odsh.download_proxy = http://1.2.3.4:4123
    )
    '''

    proxy_url = config.get('ckanext.odsh.download_proxy', None)
    if proxy_url:
        proxy = urllib.request.ProxyHandler({'http': proxy_url, 'https': proxy_url})
        opener = urllib.request.build_opener(proxy)
        urllib.request.install_opener(opener)

def clear_proxy():
    proxy = urllib.request.ProxyHandler({})
    opener = urllib.request.build_opener(proxy)
    urllib.request.install_opener(opener)