this seems to be the standard convention. If you need a
different way, you can pass a proxies dictionary to the
[Fancy]URLopener constructor.
-
"""
- proxies = {}
# in order to prefer lowercase variables, process environment in
# two passes: first matches any, second pass matches lowercase only
- for name, value in os.environ.items():
- name = name.lower()
- if value and name[-6:] == '_proxy':
- proxies[name[:-6]] = value
+
+ # select only environment variables which end in (after making lowercase) _proxy
+ proxies = {}
+ environment = []
+ for name in os.environ.keys():
+ # fast screen underscore position before more expensive case-folding
+ if len(name) > 5 and name[-6] == "_" and name[-5:].lower() == "proxy":
+ value = os.environ[name]
+ proxy_name = name[:-6].lower()
+ environment.append((name, value, proxy_name))
+ if value:
+ proxies[proxy_name] = value
# CVE-2016-1000110 - If we are running as CGI script, forget HTTP_PROXY
# (non-all-lowercase) as it may be set from the web server by a "Proxy:"
# header from the client
# If "proxy" is lowercase, it will still be used thanks to the next block
if 'REQUEST_METHOD' in os.environ:
proxies.pop('http', None)
- for name, value in os.environ.items():
+ for name, value, proxy_name in environment:
+ # not case-folded, checking here for lower-case env vars only
if name[-6:] == '_proxy':
- name = name.lower()
if value:
- proxies[name[:-6]] = value
+ proxies[proxy_name] = value
else:
- proxies.pop(name[:-6], None)
+ proxies.pop(proxy_name, None)
return proxies
def proxy_bypass_environment(host, proxies=None):
projects / thirdparty / Python / cpython.git / commitdiff
