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Sun, Jul 6, 04:32

_url.py
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"""
websocket - WebSocket client library for Python
Copyright (C) 2010 Hiroki Ohtani(liris)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1335 USA
"""
from six.moves.urllib.parse import urlparse
import os
__all__ = ["parse_url", "get_proxy_info"]
def parse_url(url):
"""
parse url and the result is tuple of
(hostname, port, resource path and the flag of secure mode)
url: url string.
"""
if ":" not in url:
raise ValueError("url is invalid")
scheme, url = url.split(":", 1)
parsed = urlparse(url, scheme="ws")
if parsed.hostname:
hostname = parsed.hostname
else:
raise ValueError("hostname is invalid")
port = 0
if parsed.port:
port = parsed.port
is_secure = False
if scheme == "ws":
if not port:
port = 80
elif scheme == "wss":
is_secure = True
if not port:
port = 443
else:
raise ValueError("scheme %s is invalid" % scheme)
if parsed.path:
resource = parsed.path
else:
resource = "/"
if parsed.query:
resource += "?" + parsed.query
return (hostname, port, resource, is_secure)
DEFAULT_NO_PROXY_HOST = ["localhost", "127.0.0.1"]
def _is_no_proxy_host(hostname, no_proxy):
if not no_proxy:
v = os.environ.get("no_proxy", "").replace(" ", "")
no_proxy = v.split(",")
if not no_proxy:
no_proxy = DEFAULT_NO_PROXY_HOST
return hostname in no_proxy
def get_proxy_info(hostname, is_secure,
proxy_host=None, proxy_port=0, proxy_auth=None, no_proxy=None):
"""
try to retrieve proxy host and port from environment
if not provided in options.
result is (proxy_host, proxy_port, proxy_auth).
proxy_auth is tuple of username and password
of proxy authentication information.
hostname: websocket server name.
is_secure: is the connection secure? (wss)
looks for "https_proxy" in env
before falling back to "http_proxy"
options: "http_proxy_host" - http proxy host name.
"http_proxy_port" - http proxy port.
"http_no_proxy" - host names, which doesn't use proxy.
"http_proxy_auth" - http proxy auth information.
tuple of username and password.
default is None
"""
if _is_no_proxy_host(hostname, no_proxy):
return None, 0, None
if proxy_host:
port = proxy_port
auth = proxy_auth
return proxy_host, port, auth
env_keys = ["http_proxy"]
if is_secure:
env_keys.insert(0, "https_proxy")
for key in env_keys:
value = os.environ.get(key, None)
if value:
proxy = urlparse(value)
auth = (proxy.username, proxy.password) if proxy.username else None
return proxy.hostname, proxy.port, auth
return None, 0, None

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