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libs/requests/packages/urllib3/util.py

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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