Adding Requests library

lib/requests/packages/oauthlib/oauth1/rfc5849/utils.py

@@ -0,0 +1,99 @@
+# -*- coding: utf-8 -*-
+
+"""
+oauthlib.utils
+~~~~~~~~~~~~~~
+
+This module contains utility methods used by various parts of the OAuth
+spec.
+"""
+
+import string
+import urllib2
+
+from oauthlib.common import quote, unquote
+
+UNICODE_ASCII_CHARACTER_SET = (string.ascii_letters.decode('ascii') +
+    string.digits.decode('ascii'))
+
+
+def filter_params(target):
+    """Decorator which filters params to remove non-oauth_* parameters
+
+    Assumes the decorated method takes a params dict or list of tuples as its
+    first argument.
+    """
+    def wrapper(params, *args, **kwargs):
+        params = filter_oauth_params(params)
+        return target(params, *args, **kwargs)
+
+    wrapper.__doc__ = target.__doc__
+    return wrapper
+
+
+def filter_oauth_params(params):
+    """Removes all non oauth parameters from a dict or a list of params."""
+    is_oauth = lambda kv: kv[0].startswith(u"oauth_")
+    if isinstance(params, dict):
+        return filter(is_oauth, params.items())
+    else:
+        return filter(is_oauth, params)
+
+
+def escape(u):
+    """Escape a unicode string in an OAuth-compatible fashion.
+
+    Per `section 3.6`_ of the spec.
+
+    .. _`section 3.6`: http://tools.ietf.org/html/rfc5849#section-3.6
+
+    """
+    if not isinstance(u, unicode):
+        raise ValueError('Only unicode objects are escapable.')
+    # Letters, digits, and the characters '_.-' are already treated as safe
+    # by urllib.quote(). We need to add '~' to fully support rfc5849.
+    return quote(u, safe='~')
+
+
+def unescape(u):
+    if not isinstance(u, unicode):
+        raise ValueError('Only unicode objects are unescapable.')
+    return unquote(u)
+
+
+def urlencode(query):
+    """Encode a sequence of two-element tuples or dictionary into a URL query string.
+
+    Operates using an OAuth-safe escape() method, in contrast to urllib.urlencode.
+    """
+    # Convert dictionaries to list of tuples
+    if isinstance(query, dict):
+        query = query.items()
+    return u"&".join([u'='.join([escape(k), escape(v)]) for k, v in query])
+
+
+def parse_keqv_list(l):
+    """A unicode-safe version of urllib2.parse_keqv_list"""
+    encoded_list = [u.encode('utf-8') for u in l]
+    encoded_parsed = urllib2.parse_keqv_list(encoded_list)
+    return dict((k.decode('utf-8'),
+        v.decode('utf-8')) for k, v in encoded_parsed.items())
+
+
+def parse_http_list(u):
+    """A unicode-safe version of urllib2.parse_http_list"""
+    encoded_str = u.encode('utf-8')
+    encoded_list = urllib2.parse_http_list(encoded_str)
+    return [s.decode('utf-8') for s in encoded_list]
+
+
+def parse_authorization_header(authorization_header):
+    """Parse an OAuth authorization header into a list of 2-tuples"""
+    auth_scheme = u'OAuth '
+    if authorization_header.startswith(auth_scheme):
+        authorization_header = authorization_header.replace(auth_scheme, u'', 1)
+    items = parse_http_list(authorization_header)
+    try:
+        return parse_keqv_list(items).items()
+    except ValueError:
+        raise ValueError('Malformed authorization header')