Add 'requests' library to third_party.

third_party/requests/cookies.py

Index: third_party/requests/cookies.py
diff --git a/third_party/requests/cookies.py b/third_party/requests/cookies.py
new file mode 100644
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+++ b/third_party/requests/cookies.py
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+# -*- coding: utf-8 -*-
+
+"""
+Compatibility code to be able to use `cookielib.CookieJar` with requests.
+
+requests.utils imports from here, so be careful with imports.
+"""
+
+import collections
+from .compat import cookielib, urlparse, Morsel
+
+try:
+    import threading
+    # grr, pyflakes: this fixes "redefinition of unused 'threading'"
+    threading
+except ImportError:
+    import dummy_threading as threading
+
+
+class MockRequest(object):
+    """Wraps a `requests.Request` to mimic a `urllib2.Request`.
+
+    The code in `cookielib.CookieJar` expects this interface in order to correctly
+    manage cookie policies, i.e., determine whether a cookie can be set, given the
+    domains of the request and the cookie.
+
+    The original request object is read-only. The client is responsible for collecting
+    the new headers via `get_new_headers()` and interpreting them appropriately. You
+    probably want `get_cookie_header`, defined below.
+    """
+
+    def __init__(self, request):
+        self._r = request
+        self._new_headers = {}
+        self.type = urlparse(self._r.url).scheme
+
+    def get_type(self):
+        return self.type
+
+    def get_host(self):
+        return urlparse(self._r.url).netloc
+
+    def get_origin_req_host(self):
+        return self.get_host()
+
+    def get_full_url(self):
+        return self._r.url
+
+    def is_unverifiable(self):
+        return True
+
+    def has_header(self, name):
+        return name in self._r.headers or name in self._new_headers
+
+    def get_header(self, name, default=None):
+        return self._r.headers.get(name, self._new_headers.get(name, default))
+
+    def add_header(self, key, val):
+        """cookielib has no legitimate use for this method; add it back if you find one."""
+        raise NotImplementedError("Cookie headers should be added with add_unredirected_header()")
+
+    def add_unredirected_header(self, name, value):
+        self._new_headers[name] = value
+
+    def get_new_headers(self):
+        return self._new_headers
+
+    @property
+    def unverifiable(self):
+        return self.is_unverifiable()
+
+    @property
+    def origin_req_host(self):
+        return self.get_origin_req_host()
+
+
+class MockResponse(object):
+    """Wraps a `httplib.HTTPMessage` to mimic a `urllib.addinfourl`.
+
+    ...what? Basically, expose the parsed HTTP headers from the server response
+    the way `cookielib` expects to see them.
+    """
+
+    def __init__(self, headers):
+        """Make a MockResponse for `cookielib` to read.
+
+        :param headers: a httplib.HTTPMessage or analogous carrying the headers
+        """
+        self._headers = headers
+
+    def info(self):
+        return self._headers
+
+    def getheaders(self, name):
+        self._headers.getheaders(name)
+
+
+def extract_cookies_to_jar(jar, request, response):
+    """Extract the cookies from the response into a CookieJar.
+
+    :param jar: cookielib.CookieJar (not necessarily a RequestsCookieJar)
+    :param request: our own requests.Request object
+    :param response: urllib3.HTTPResponse object
+    """
+    # the _original_response field is the wrapped httplib.HTTPResponse object,
+    req = MockRequest(request)
+    # pull out the HTTPMessage with the headers and put it in the mock:
+    res = MockResponse(response._original_response.msg)
+    jar.extract_cookies(res, req)
+
+
+def get_cookie_header(jar, request):
+    """Produce an appropriate Cookie header string to be sent with `request`, or None."""
+    r = MockRequest(request)
+    jar.add_cookie_header(r)
+    return r.get_new_headers().get('Cookie')
+
+
+def remove_cookie_by_name(cookiejar, name, domain=None, path=None):
+    """Unsets a cookie by name, by default over all domains and paths.
+
+    Wraps CookieJar.clear(), is O(n).
+    """
+    clearables = []
+    for cookie in cookiejar:
+        if cookie.name == name:
+            if domain is None or domain == cookie.domain:
+                if path is None or path == cookie.path:
+                    clearables.append((cookie.domain, cookie.path, cookie.name))
+
+    for domain, path, name in clearables:
+        cookiejar.clear(domain, path, name)
+
+
+class CookieConflictError(RuntimeError):
+    """There are two cookies that meet the criteria specified in the cookie jar.
+    Use .get and .set and include domain and path args in order to be more specific."""
+
+
+class RequestsCookieJar(cookielib.CookieJar, collections.MutableMapping):
+    """Compatibility class; is a cookielib.CookieJar, but exposes a dict interface.
+
+    This is the CookieJar we create by default for requests and sessions that
+    don't specify one, since some clients may expect response.cookies and
+    session.cookies to support dict operations.
+
+    Don't use the dict interface internally; it's just for compatibility with
+    with external client code. All `requests` code should work out of the box
+    with externally provided instances of CookieJar, e.g., LWPCookieJar and
+    FileCookieJar.
+
+    Caution: dictionary operations that are normally O(1) may be O(n).
+
+    Unlike a regular CookieJar, this class is pickleable.
+    """
+
+    def get(self, name, default=None, domain=None, path=None):
+        """Dict-like get() that also supports optional domain and path args in
+        order to resolve naming collisions from using one cookie jar over
+        multiple domains. Caution: operation is O(n), not O(1)."""
+        try:
+            return self._find_no_duplicates(name, domain, path)
+        except KeyError:
+            return default
+
+    def set(self, name, value, **kwargs):
+        """Dict-like set() that also supports optional domain and path args in
+        order to resolve naming collisions from using one cookie jar over
+        multiple domains."""
+        # support client code that unsets cookies by assignment of a None value:
+        if value is None:
+            remove_cookie_by_name(self, name, domain=kwargs.get('domain'), path=kwargs.get('path'))
+            return
+
+        if isinstance(value, Morsel):
+            c = morsel_to_cookie(value)
+        else:
+            c = create_cookie(name, value, **kwargs)
+        self.set_cookie(c)
+        return c
+
+    def keys(self):
+        """Dict-like keys() that returns a list of names of cookies from the jar.
+        See values() and items()."""
+        keys = []
+        for cookie in iter(self):
+            keys.append(cookie.name)
+        return keys
+
+    def values(self):
+        """Dict-like values() that returns a list of values of cookies from the jar.
+        See keys() and items()."""
+        values = []
+        for cookie in iter(self):
+            values.append(cookie.value)
+        return values
+
+    def items(self):
+        """Dict-like items() that returns a list of name-value tuples from the jar.
+        See keys() and values(). Allows client-code to call "dict(RequestsCookieJar)
+        and get a vanilla python dict of key value pairs."""
+        items = []
+        for cookie in iter(self):
+            items.append((cookie.name, cookie.value))
+        return items
+
+    def list_domains(self):
+        """Utility method to list all the domains in the jar."""
+        domains = []
+        for cookie in iter(self):
+            if cookie.domain not in domains:
+                domains.append(cookie.domain)
+        return domains
+
+    def list_paths(self):
+        """Utility method to list all the paths in the jar."""
+        paths = []
+        for cookie in iter(self):
+            if cookie.path not in paths:
+                paths.append(cookie.path)
+        return paths
+
+    def multiple_domains(self):
+        """Returns True if there are multiple domains in the jar.
+        Returns False otherwise."""
+        domains = []
+        for cookie in iter(self):
+            if cookie.domain is not None and cookie.domain in domains:
+                return True
+            domains.append(cookie.domain)
+        return False  # there is only one domain in jar
+
+    def get_dict(self, domain=None, path=None):
+        """Takes as an argument an optional domain and path and returns a plain old
+        Python dict of name-value pairs of cookies that meet the requirements."""
+        dictionary = {}
+        for cookie in iter(self):
+            if (domain is None or cookie.domain == domain) and (path is None
+                                                or cookie.path == path):
+                dictionary[cookie.name] = cookie.value
+        return dictionary
+
+    def __getitem__(self, name):
+        """Dict-like __getitem__() for compatibility with client code. Throws exception
+        if there are more than one cookie with name. In that case, use the more
+        explicit get() method instead. Caution: operation is O(n), not O(1)."""
+
+        return self._find_no_duplicates(name)
+
+    def __setitem__(self, name, value):
+        """Dict-like __setitem__ for compatibility with client code. Throws exception
+        if there is already a cookie of that name in the jar. In that case, use the more
+        explicit set() method instead."""
+
+        self.set(name, value)
+
+    def __delitem__(self, name):
+        """Deletes a cookie given a name. Wraps cookielib.CookieJar's remove_cookie_by_name()."""
+        remove_cookie_by_name(self, name)
+
+    def update(self, other):
+        """Updates this jar with cookies from another CookieJar or dict-like"""
+        if isinstance(other, cookielib.CookieJar):
+            for cookie in other:
+                self.set_cookie(cookie)
+        else:
+            super(RequestsCookieJar, self).update(other)
+
+    def _find(self, name, domain=None, path=None):
+        """Requests uses this method internally to get cookie values. Takes as args name
+        and optional domain and path. Returns a cookie.value. If there are conflicting cookies,
+        _find arbitrarily chooses one. See _find_no_duplicates if you want an exception thrown
+        if there are conflicting cookies."""
+        for cookie in iter(self):
+            if cookie.name == name:
+                if domain is None or cookie.domain == domain:
+                    if path is None or cookie.path == path:
+                        return cookie.value
+
+        raise KeyError('name=%r, domain=%r, path=%r' % (name, domain, path))
+
+    def _find_no_duplicates(self, name, domain=None, path=None):
+        """__get_item__ and get call _find_no_duplicates -- never used in Requests internally.
+        Takes as args name and optional domain and path. Returns a cookie.value.
+        Throws KeyError if cookie is not found and CookieConflictError if there are
+        multiple cookies that match name and optionally domain and path."""
+        toReturn = None
+        for cookie in iter(self):
+            if cookie.name == name:
+                if domain is None or cookie.domain == domain:
+                    if path is None or cookie.path == path:
+                        if toReturn is not None:  # if there are multiple cookies that meet passed in criteria
+                            raise CookieConflictError('There are multiple cookies with name, %r' % (name))
+                        toReturn = cookie.value  # we will eventually return this as long as no cookie conflict
+
+        if toReturn:
+            return toReturn
+        raise KeyError('name=%r, domain=%r, path=%r' % (name, domain, path))
+
+    def __getstate__(self):
+        """Unlike a normal CookieJar, this class is pickleable."""
+        state = self.__dict__.copy()
+        # remove the unpickleable RLock object
+        state.pop('_cookies_lock')
+        return state
+
+    def __setstate__(self, state):
+        """Unlike a normal CookieJar, this class is pickleable."""
+        self.__dict__.update(state)
+        if '_cookies_lock' not in self.__dict__:
+            self._cookies_lock = threading.RLock()
+
+    def copy(self):
+        """Return a copy of this RequestsCookieJar."""
+        new_cj = RequestsCookieJar()
+        new_cj.update(self)
+        return new_cj
+
+
+def create_cookie(name, value, **kwargs):
+    """Make a cookie from underspecified parameters.
+
+    By default, the pair of `name` and `value` will be set for the domain ''
+    and sent on every request (this is sometimes called a "supercookie").
+    """
+    result = dict(
+        version=0,
+        name=name,
+        value=value,
+        port=None,
+        domain='',
+        path='/',
+        secure=False,
+        expires=None,
+        discard=True,
+        comment=None,
+        comment_url=None,
+        rest={'HttpOnly': None},
+        rfc2109=False,)
+
+    badargs = set(kwargs) - set(result)
+    if badargs:
+        err = 'create_cookie() got unexpected keyword arguments: %s'
+        raise TypeError(err % list(badargs))
+
+    result.update(kwargs)
+    result['port_specified'] = bool(result['port'])
+    result['domain_specified'] = bool(result['domain'])
+    result['domain_initial_dot'] = result['domain'].startswith('.')
+    result['path_specified'] = bool(result['path'])
+
+    return cookielib.Cookie(**result)
+
+
+def morsel_to_cookie(morsel):
+    """Convert a Morsel object into a Cookie containing the one k/v pair."""
+    c = create_cookie(
+        name=morsel.key,
+        value=morsel.value,
+        version=morsel['version'] or 0,
+        port=None,
+        port_specified=False,
+        domain=morsel['domain'],
+        domain_specified=bool(morsel['domain']),
+        domain_initial_dot=morsel['domain'].startswith('.'),
+        path=morsel['path'],
+        path_specified=bool(morsel['path']),
+        secure=bool(morsel['secure']),
+        expires=morsel['max-age'] or morsel['expires'],
+        discard=False,
+        comment=morsel['comment'],
+        comment_url=bool(morsel['comment']),
+        rest={'HttpOnly': morsel['httponly']},
+        rfc2109=False,)
+    return c
+
+
+def cookiejar_from_dict(cookie_dict, cookiejar=None):
+    """Returns a CookieJar from a key/value dictionary.
+
+    :param cookie_dict: Dict of key/values to insert into CookieJar.
+    """
+    if cookiejar is None:
+        cookiejar = RequestsCookieJar()
+
+    if cookie_dict is not None:
+        for name in cookie_dict:
+            cookiejar.set_cookie(create_cookie(name, cookie_dict[name]))
+    return cookiejar