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# urllib3/util.py
# Copyright 2008-2012 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
#
# This module is part of urllib3 and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
from base64 import b64encode
try:
from select import poll, POLLIN
except ImportError: # `poll` doesn't exist on OSX and other platforms
poll = False
try:
from select import select
except ImportError: # `select` doesn't exist on AppEngine.
select = False
from .packages import six
from .exceptions import LocationParseError
def make_headers(keep_alive=None, accept_encoding=None, user_agent=None,
basic_auth=None):
"""
Shortcuts for generating request headers.
:param keep_alive:
If ``True``, adds 'connection: keep-alive' header.
:param accept_encoding:
Can be a boolean, list, or string.
``True`` translates to 'gzip,deflate'.
List will get joined by comma.
String will be used as provided.
:param user_agent:
String representing the user-agent you want, such as
"python-urllib3/0.6"
:param basic_auth:
Colon-separated username:password string for 'authorization: basic ...'
auth header.
Example: ::
>>> make_headers(keep_alive=True, user_agent="Batman/1.0")
{'connection': 'keep-alive', 'user-agent': 'Batman/1.0'}
>>> make_headers(accept_encoding=True)
{'accept-encoding': 'gzip,deflate'}
"""
headers = {}
if accept_encoding:
if isinstance(accept_encoding, str):
pass
elif isinstance(accept_encoding, list):
accept_encoding = ','.join(accept_encoding)
else:
accept_encoding = 'gzip,deflate'
headers['accept-encoding'] = accept_encoding
if user_agent:
headers['user-agent'] = user_agent
if keep_alive:
headers['connection'] = 'keep-alive'
if basic_auth:
headers['authorization'] = 'Basic ' + \
b64encode(six.b(basic_auth)).decode('utf-8')
return headers
def get_host(url):
"""
Given a url, return its scheme, host and port (None if it's not there).
For example: ::
>>> get_host('http://google.com/mail/')
('http', 'google.com', None)
>>> get_host('google.com:80')
('http', 'google.com', 80)
"""
# This code is actually similar to urlparse.urlsplit, but much
# simplified for our needs.
port = None
scheme = 'http'
if '://' in url:
scheme, url = url.split('://', 1)
if '/' in url:
url, _path = url.split('/', 1)
if '@' in url:
_auth, url = url.split('@', 1)
if ':' in url:
url, port = url.split(':', 1)
if not port.isdigit():
raise LocationParseError("Failed to parse: %s" % url)
port = int(port)
return scheme, url, port
def is_connection_dropped(conn):
"""
Returns True if the connection is dropped and should be closed.
:param conn:
``HTTPConnection`` object.
Note: For platforms like AppEngine, this will always return ``False`` to
let the platform handle connection recycling transparently for us.
"""
sock = getattr(conn, 'sock', False)
if not sock: #Platform-specific: AppEngine
return False
if not poll: # Platform-specific
if not select: #Platform-specific: AppEngine
return False
return select([sock], [], [], 0.0)[0]
# This version is better on platforms that support it.
p = poll()
p.register(sock, POLLIN)
for (fno, ev) in p.poll(0.0):
if fno == sock.fileno():
# Either data is buffered (bad), or the connection is dropped.
return True
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