Application: gvSIG desktop » gvSIG scripting

# -*- 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 calendar

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:

            continue

        if domain is not None and domain != cookie.domain:

            continue

        if path is not None and path != cookie.path:

            continue

        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 instance 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 = calendar.timegm(

            time.strptime(morsel['expires'], time_template)

        )

    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