mirror of https://github.com/python/cpython.git
233 lines
7.7 KiB
TeX
233 lines
7.7 KiB
TeX
|
\section{\module{Cookie} ---
|
||
|
RFC2109 HTTP State Management (AKA Cookies) Support}
|
||
|
\declaremodule{standard}{Cookie}
|
||
|
|
||
|
\moduleauthor{Timothy O'Malley}{timo@alum.mit.edu}
|
||
|
\sectionauthor{Moshe Zadka}{moshez@zadka.site.co.il}
|
||
|
|
||
|
\modulesynopsis{Support HTTP State Management (Cookies)}
|
||
|
|
||
|
The \module{Cookie} module defines classes for abstracting the concept of
|
||
|
Cookies, an HTTP state management mechanism. It supports both simplistic
|
||
|
string-only cookies, and provides an abstraction for having any serializable
|
||
|
data-type as cookie value.
|
||
|
|
||
|
\subsection{Example \label{cookie-example}}
|
||
|
|
||
|
The following example demonstrates how to open a can of spam using the
|
||
|
\module{spam} module.
|
||
|
|
||
|
\begin{verbatim}
|
||
|
>>> import Cookie
|
||
|
>>> C = Cookie.SimpleCookie()
|
||
|
>>> C = Cookie.SerialCookie()
|
||
|
>>> C = Cookie.SmartCookie()
|
||
|
>>> C = Cookie.Cookie() # backwards compatible alias for SmartCookie
|
||
|
>>> C = Cookie.SmartCookie()
|
||
|
>>> C["fig"] = "newton"
|
||
|
>>> C["sugar"] = "wafer"
|
||
|
>>> C # generate HTTP headers
|
||
|
Set-Cookie: sugar=wafer;
|
||
|
Set-Cookie: fig=newton;
|
||
|
>>> C = Cookie.SmartCookie()
|
||
|
>>> C["rocky"] = "road"
|
||
|
>>> C["rocky"]["path"] = "/cookie"
|
||
|
>>> print C.output(header="Cookie:")
|
||
|
Cookie: rocky=road; Path=/cookie;
|
||
|
>>> print C.output(attrs=[], header="Cookie:")
|
||
|
Cookie: rocky=road;
|
||
|
>>> C = Cookie.SmartCookie()
|
||
|
>>> C.load("chips=ahoy; vienna=finger") # load from a string (HTTP header)
|
||
|
>>> C
|
||
|
Set-Cookie: vienna=finger;
|
||
|
Set-Cookie: chips=ahoy;
|
||
|
>>> C = Cookie.SmartCookie()
|
||
|
>>> C.load('keebler="E=everybody; L=\\"Loves\\"; fudge=\\012;";')
|
||
|
>>> C
|
||
|
Set-Cookie: keebler="E=everybody; L=\"Loves\"; fudge=\012;";
|
||
|
>>> C = Cookie.SmartCookie()
|
||
|
>>> C["oreo"] = "doublestuff"
|
||
|
>>> C["oreo"]["path"] = "/"
|
||
|
>>> C
|
||
|
Set-Cookie: oreo="doublestuff"; Path=/;
|
||
|
>>> C = Cookie.SmartCookie()
|
||
|
>>> C["twix"] = "none for you"
|
||
|
>>> C["twix"].value
|
||
|
'none for you'
|
||
|
>>> C = Cookie.SimpleCookie()
|
||
|
>>> C["number"] = 7 # equivalent to C["number"] = str(7)
|
||
|
>>> C["string"] = "seven"
|
||
|
>>> C["number"].value
|
||
|
'7'
|
||
|
>>> C["string"].value
|
||
|
'seven'
|
||
|
>>> C
|
||
|
Set-Cookie: number=7;
|
||
|
Set-Cookie: string=seven;
|
||
|
>>> C = Cookie.SerialCookie()
|
||
|
>>> C["number"] = 7
|
||
|
>>> C["string"] = "seven"
|
||
|
>>> C["number"].value
|
||
|
7
|
||
|
>>> C["string"].value
|
||
|
'seven'
|
||
|
>>> C
|
||
|
Set-Cookie: number="I7\012.";
|
||
|
Set-Cookie: string="S'seven'\012p1\012.";
|
||
|
>>> C = Cookie.SmartCookie()
|
||
|
>>> C["number"] = 7
|
||
|
>>> C["string"] = "seven"
|
||
|
>>> C["number"].value
|
||
|
7
|
||
|
>>> C["string"].value
|
||
|
'seven'
|
||
|
>>> C
|
||
|
Set-Cookie: number="I7\012.";
|
||
|
Set-Cookie: string=seven;
|
||
|
\end{verbatim}
|
||
|
|
||
|
\begin{excdesc}{CookieError}
|
||
|
Exception failing because of RFC2109 invalidity: incorrect attributes,
|
||
|
incorrect \code{Set-Cookie} header, etc.
|
||
|
\end{excdesc}
|
||
|
|
||
|
%\subsection{Morsel Objects}
|
||
|
%\label{morsel-objects}
|
||
|
|
||
|
\begin{classdesc}{Morsel}{}
|
||
|
Abstract a key/value pair, which has some RFC2109 attributes.
|
||
|
|
||
|
Morsels are dictionary-like objects, whose set of keys is constant ---
|
||
|
the valid RFC2109 attributes, which are
|
||
|
|
||
|
\begin{itemize}
|
||
|
\item \code{expires}
|
||
|
\item \code{path}
|
||
|
\item \code{comment}
|
||
|
\item \code{domain}
|
||
|
\item \code{max-age}
|
||
|
\item \code{secure}
|
||
|
\item \code{version}
|
||
|
\end{itemize}
|
||
|
\end{itemize}
|
||
|
|
||
|
The keys are case-insensitive.
|
||
|
\end{classdesc}
|
||
|
|
||
|
\begin{memberdesc}[Morsel]{value}
|
||
|
The value of the cookie.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{memberdesc}[Morsel]{coded_value}
|
||
|
The encoded value of the cookie --- this is what should be sent.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
|
||
|
\begin{memberdesc}[Morsel]{key}
|
||
|
The name of the cookie.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{methodesc}[Morsel]{set}{key, value, coded_value}
|
||
|
Set the \var{key}, \var{value} and \var{coded_value} members.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{methoddesc}[Morsel]{isReservedKey}{K}
|
||
|
Whether \var{K} is a member of the set of keys of a \class{Morsel}.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{methoddesc}[Morsel]{output}{\opt{attrs, \opt{header}}
|
||
|
Return a string representation of the Morsel, suitable
|
||
|
to be sent as an HTTP header. By default, all the attributes are included,
|
||
|
unless \var{attrs} is given, in which case it should be a list of attributes
|
||
|
to use. \var{header} is by default \code{"Set-Cookie:"}.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{methoddesc}[Morsel]{js_output}{\opt{attrs}}
|
||
|
Return an embeddable JavaScript snippet, which, if run on a browser which
|
||
|
supports JavaScript, will act the same as if the HTTP header was sent.
|
||
|
|
||
|
The meaning for \var{attrs} is the same as in \method{output()}.
|
||
|
\end{methoddesc}.
|
||
|
|
||
|
\begin{methoddesc}[Morsel]{OutputString}{\opt{attrs}}
|
||
|
Return a string representing the Morsel, without any surrounding HTTP
|
||
|
or JavaScript.
|
||
|
|
||
|
The meaning for \var{attrs} is the same as in \method{output()}.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
# This used to be strict parsing based on the RFC2109 and RFC2068
|
||
|
# specifications. I have since discovered that MSIE 3.0x doesn't
|
||
|
# follow the character rules outlined in those specs. As a
|
||
|
# result, the parsing rules here are less strict.
|
||
|
|
||
|
\begin{classdesc}{BaseCookie}{\opt{input}}
|
||
|
This class is a dictionary-like object whose keys are strings and
|
||
|
whose values are \class{Morsel}s. Note that upon setting a key to
|
||
|
a value, the value is first converted to a \class{Morsel} containing
|
||
|
the key and the value.
|
||
|
|
||
|
If \var{input} is given, it is passed to the \method{load} method.
|
||
|
\end{classdesc}
|
||
|
|
||
|
\begin{methoddesc}[BaseCookie]{value_decode}{val}
|
||
|
Return a decoded value from a string representation. Return value can
|
||
|
be any type. This method does nothing in \class{BaseCookie} --- it exists
|
||
|
so it can be overridden.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{methoddesc}[BaseCookie]{value_encode}{val}
|
||
|
Return an encoded value. \var{val} can be any type, but return value
|
||
|
must be a string. This method does nothing in \class{BaseCookie} --- it exists
|
||
|
so it can be overridden
|
||
|
|
||
|
In general, it should be the case that \method{value_encode} and
|
||
|
\method{value_decode} are inverses on the range of \var{value_decode}.
|
||
|
\end{methoddesc}.
|
||
|
|
||
|
\begin{methoddesc}[BaseCookie]{output}{\opt{attrs\opt{, header\opt{, sep}}}}
|
||
|
Return a string representation suitable to be sent as HTTP headers.
|
||
|
\var{attrs} and \var{header} are sent to each \class{Morsel}'s \method{output}
|
||
|
method. \var{sep} is used to join the headers together, and is by default
|
||
|
a newline.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{methoddesc}[BaseCookie]{js_output}{\opt{attrs}}
|
||
|
Return an embeddable JavaScript snippet, which, if run on a browser which
|
||
|
supports JavaScript, will act the same as if the HTTP headers was sent.
|
||
|
|
||
|
The meaning for \var{attrs} is the same as in \method{output()}.
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{methoddesc}[BaseCookie]{load}{rawdata}
|
||
|
If \var{rawdata} is a string, parse it as an \code{HTTP_COOKIE} and add
|
||
|
the values found there as \class{Morsel}s. If it is a dictionary, it
|
||
|
is equivalent to calling
|
||
|
|
||
|
\begin{verbatim}
|
||
|
map(BaseCookie.__setitem__, rawdata.keys(), rawdata.values())
|
||
|
\end{varbatim}
|
||
|
\end{methoddesc}
|
||
|
|
||
|
\begin{classdesc}{SimpleCookie}{\opt{input}}
|
||
|
This class derives from \class{BaseCookie} and overrides \method{value_decode}
|
||
|
and \method{value_encode} to be the identity and \function{str()} respectively.
|
||
|
\end{classdesc}
|
||
|
|
||
|
\begin{classdesc}{SerialCookie}{\opt{input}}
|
||
|
This class derives from \class{BaseCookie} and overrides \method{value_decode}
|
||
|
and \method{value_encode} to be the \function{pickle.loads()} and
|
||
|
\function{pickle.dumps}. Note that using this class is a security hole,
|
||
|
as arbitrary client-code can be run on \function{pickle.loads()}.
|
||
|
\end{classdesc}
|
||
|
|
||
|
\begin{classdesc}{SmartCookie}{\opt{input}}
|
||
|
This class derives from \class{BaseCookie}. It overrides \method{value_decode}
|
||
|
to be \function{pickle.loads()} if it is a valid pickle, and otherwise
|
||
|
the value itself. It overrides \method{value_encode} to be
|
||
|
\function{pickle.dumps()} unless it is a string, in which case it returns
|
||
|
the value itself.
|
||
|
|
||
|
The same security warning from \class{SerialCookie} applies here.
|
||
|
\end{classdesc}
|