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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 copy
import time
import collections
from .compat import cookielib, urlparse, urlunparse, 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):
# Only return the response's URL if the user hadn't set the Host
# header
if not self._r.headers.get('Host'):
return self._r.url
# If they did set it, retrieve it and reconstruct the expected domain
host = self._r.headers['Host']
parsed = urlparse(self._r.url)
# Reconstruct the URL as we expect it
return urlunparse([
parsed.scheme, host, parsed.path, parsed.params, parsed.query,
parsed.fragment
])
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()
@property
def host(self):
return self.get_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
"""
if not (hasattr(response, '_original_response') and
response._original_response):
return
# 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.
Requests does not use the dict interface internally; it's just for
compatibility with external client code. All requests code should work
out of the box with externally provided instances of ``CookieJar``, e.g.
``LWPCookieJar`` and ``FileCookieJar``.
Unlike a regular CookieJar, this class is pickleable.
.. warning:: dictionary operations that are normally O(1) may be O(n).
"""
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.
.. warning:: 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 iterkeys(self):
"""Dict-like iterkeys() that returns an iterator of names of cookies
from the jar. See itervalues() and iteritems()."""
for cookie in iter(self):
yield cookie.name
def keys(self):
"""Dict-like keys() that returns a list of names of cookies from the
jar. See values() and items()."""
return list(self.iterkeys())
def itervalues(self):
"""Dict-like itervalues() that returns an iterator of values of cookies
from the jar. See iterkeys() and iteritems()."""
for cookie in iter(self):
yield cookie.value
def values(self):
"""Dict-like values() that returns a list of values of cookies from the
jar. See keys() and items()."""
return list(self.itervalues())
def iteritems(self):
"""Dict-like iteritems() that returns an iterator of name-value tuples
from the jar. See iterkeys() and itervalues()."""
for cookie in iter(self):
yield cookie.name, cookie.value
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."""
return list(self.iteritems())
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.
.. warning:: 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 set_cookie(self, cookie, *args, **kwargs):
if hasattr(cookie.value, 'startswith') and cookie.value.startswith('"') and cookie.value.endswith('"'):
cookie.value = cookie.value.replace('\\"', '')
return super(RequestsCookieJar, self).set_cookie(cookie, *args, **kwargs)
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(copy.copy(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):
"""Both ``__get_item__`` and ``get`` call this function: it's never
used elsewhere in Requests. 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 _copy_cookie_jar(jar):
if jar is None:
return None
if hasattr(jar, 'copy'):
# We're dealing with an instane of RequestsCookieJar
return jar.copy()
# We're dealing with a generic CookieJar instance
new_jar = copy.copy(jar)
new_jar.clear()
for cookie in jar:
new_jar.set_cookie(copy.copy(cookie))
return new_jar
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."""
expires = None
if morsel['max-age']:
try:
expires = int(time.time() + int(morsel['max-age']))
except ValueError:
raise TypeError('max-age: %s must be integer' % morsel['max-age'])
elif morsel['expires']:
time_template = '%a, %d-%b-%Y %H:%M:%S GMT'
expires = int(time.mktime(
time.strptime(morsel['expires'], time_template)) - time.timezone)
return create_cookie(
comment=morsel['comment'],
comment_url=bool(morsel['comment']),
discard=False,
domain=morsel['domain'],
expires=expires,
name=morsel.key,
path=morsel['path'],
port=None,
rest={'HttpOnly': morsel['httponly']},
rfc2109=False,
secure=bool(morsel['secure']),
value=morsel.value,
version=morsel['version'] or 0,
)
def cookiejar_from_dict(cookie_dict, cookiejar=None, overwrite=True):
"""Returns a CookieJar from a key/value dictionary.
:param cookie_dict: Dict of key/values to insert into CookieJar.
:param cookiejar: (optional) A cookiejar to add the cookies to.
:param overwrite: (optional) If False, will not replace cookies
already in the jar with new ones.
"""
if cookiejar is None:
cookiejar = RequestsCookieJar()
if cookie_dict is not None:
names_from_jar = [cookie.name for cookie in cookiejar]
for name in cookie_dict:
if overwrite or (name not in names_from_jar):
cookiejar.set_cookie(create_cookie(name, cookie_dict[name]))
return cookiejar
def merge_cookies(cookiejar, cookies):
"""Add cookies to cookiejar and returns a merged CookieJar.
:param cookiejar: CookieJar object to add the cookies to.
:param cookies: Dictionary or CookieJar object to be added.
"""
if not isinstance(cookiejar, cookielib.CookieJar):
raise ValueError('You can only merge into CookieJar')
if isinstance(cookies, dict):
cookiejar = cookiejar_from_dict(
cookies, cookiejar=cookiejar, overwrite=False)
elif isinstance(cookies, cookielib.CookieJar):
try:
cookiejar.update(cookies)
except AttributeError:
for cookie_in_jar in cookies:
cookiejar.set_cookie(cookie_in_jar)
return cookiejar

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