CGI::Cookie(3pm) Perl Programmers Reference Guide CGI::Cookie(3pm)
NAME
CGI::Cookie - Interface to Netscape Cookies
SYNOPSIS
use CGI qw/:standard/;
use CGI::Cookie;
# Create new cookies and send them
$cookie1 = new CGI::Cookie(-name=>'ID',-value=>123456);
$cookie2 = new CGI::Cookie(-name=>'preferences',
-value=>{ font => Helvetica,
size => 12 }
);
print header(-cookie=>[$cookie1,$cookie2]);
# fetch existing cookies
%cookies = fetch CGI::Cookie;
$id = $cookies{'ID'}->value;
# create cookies returned from an external source
%cookies = parse CGI::Cookie($ENV{COOKIE});
DESCRIPTION
CGI::Cookie is an interface to Netscape (HTTP/1.1) cookies, an innovation that allows Web servers to
store persistent information on the browser's side of the connection. Although CGI::Cookie is
intended to be used in conjunction with CGI.pm (and is in fact used by it internally), you can use
this module independently.
For full information on cookies see
http://www.ics.uci.edu/pub/ietf/http/rfc2109.txt
USING CGI::Cookie
CGI::Cookie is object oriented. Each cookie object has a name and a value. The name is any scalar
value. The value is any scalar or array value (associative arrays are also allowed). Cookies also
have several optional attributes, including:
1. expiration date
The expiration date tells the browser how long to hang on to the cookie. If the cookie specifies
an expiration date in the future, the browser will store the cookie information in a disk file
and return it to the server every time the user reconnects (until the expiration date is
reached). If the cookie species an expiration date in the past, the browser will remove the
cookie from the disk file. If the expiration date is not specified, the cookie will persist only
until the user quits the browser.
2. domain
This is a partial or complete domain name for which the cookie is valid. The browser will return
the cookie to any host that matches the partial domain name. For example, if you specify a
domain name of ".capricorn.com", then Netscape will return the cookie to Web servers running on
any of the machines "www.capricorn.com", "ftp.capricorn.com", "feckless.capricorn.com", etc.
Domain names must contain at least two periods to prevent attempts to match on top level domains
like ".edu". If no domain is specified, then the browser will only return the cookie to servers
on the host the cookie originated from.
3. path
If you provide a cookie path attribute, the browser will check it against your script's URL
before returning the cookie. For example, if you specify the path "/cgi-bin", then the cookie
will be returned to each of the scripts "/cgi-bin/tally.pl", "/cgi-bin/order.pl", and
"/cgi-bin/customer_service/complain.pl", but not to the script "/cgi-private/site_admin.pl". By
default, the path is set to "/", so that all scripts at your site will receive the cookie.
4. secure flag
If the "secure" attribute is set, the cookie will only be sent to your script if the CGI request
is occurring on a secure channel, such as SSL.
Creating New Cookies
$c = new CGI::Cookie(-name => 'foo',
-value => 'bar',
-expires => '+3M',
-domain => '.capricorn.com',
-path => '/cgi-bin/database',
-secure => 1
);
Create cookies from scratch with the new method. The -name and -value parameters are required. The
name must be a scalar value. The value can be a scalar, an array reference, or a hash reference.
(At some point in the future cookies will support one of the Perl object serialization protocols for
full generality).
-expires accepts any of the relative or absolute date formats recognized by CGI.pm, for example "+3M"
for three months in the future. See CGI.pm's documentation for details.
-domain points to a domain name or to a fully qualified host name. If not specified, the cookie will
be returned only to the Web server that created it.
-path points to a partial URL on the current server. The cookie will be returned to all URLs begin-
ning with the specified path. If not specified, it defaults to '/', which returns the cookie to all
pages at your site.
-secure if set to a true value instructs the browser to return the cookie only when a cryptographic
protocol is in use.
Sending the Cookie to the Browser
Within a CGI script you can send a cookie to the browser by creating one or more Set-Cookie: fields
in the HTTP header. Here is a typical sequence:
my $c = new CGI::Cookie(-name => 'foo',
-value => ['bar','baz'],
-expires => '+3M');
print "Set-Cookie: $c\n";
print "Content-Type: text/html\n\n";
To send more than one cookie, create several Set-Cookie: fields.
If you are using CGI.pm, you send cookies by providing a -cookie argument to the header() method:
print header(-cookie=>$c);
Mod_perl users can set cookies using the request object's header_out() method:
$r->headers_out->set('Set-Cookie' => $c);
Internally, Cookie overloads the "" operator to call its as_string() method when incorporated into
the HTTP header. as_string() turns the Cookie's internal representation into an RFC-compliant text
representation. You may call as_string() yourself if you prefer:
print "Set-Cookie: ",$c->as_string,"\n";
Recovering Previous Cookies
%cookies = fetch CGI::Cookie;
fetch returns an associative array consisting of all cookies returned by the browser. The keys of
the array are the cookie names. You can iterate through the cookies this way:
%cookies = fetch CGI::Cookie;
foreach (keys %cookies) {
do_something($cookies{$_});
}
In a scalar context, fetch() returns a hash reference, which may be more efficient if you are manipu-
lating multiple cookies.
CGI.pm uses the URL escaping methods to save and restore reserved characters in its cookies. If you
are trying to retrieve a cookie set by a foreign server, this escaping method may trip you up. Use
raw_fetch() instead, which has the same semantics as fetch(), but performs no unescaping.
You may also retrieve cookies that were stored in some external form using the parse() class method:
$COOKIES = `cat /usr/tmp/Cookie_stash`;
%cookies = parse CGI::Cookie($COOKIES);
If you are in a mod_perl environment, you can save some overhead by passing the request object to
fetch() like this:
CGI::Cookie->fetch($r);
Manipulating Cookies
Cookie objects have a series of accessor methods to get and set cookie attributes. Each accessor has
a similar syntax. Called without arguments, the accessor returns the current value of the attribute.
Called with an argument, the accessor changes the attribute and returns its new value.
nm(
Get or set the cookie's name. Example:
$name = $c->name;
$new_name = $c->name('fred');
vle)
Get or set the cookie's value. Example:
$value = $c->value;
@new_value = $c->value(['a','b','c','d']);
vle) is context sensitive. In a list context it will return the current value of the cookie
as an array. In a scalar context it will return the first value of a multivalued cookie.
dmi(
Get or set the cookie's domain.
pt(
Get or set the cookie's path.
eprs)
Get or set the cookie's expiration time.
AUTHOR INFORMATION
Copyright 1997-1998, Lincoln D. Stein. All rights reserved.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl
itself.
Address bug reports and comments to: lstein@cshl.org
BUGS
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SEE ALSO
CGI::Carp, CGI
perl v5.8.8 2001-09-21 CGI::Cookie(3pm)
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