CGI::Cookie - Interface to Netscape Cookies

AUTHOR INFORMATION
BUGS
SEE ALSO

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

2. domain

3. path

4. secure flag

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 beginning 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 manipulating 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.

name()

Get or set the cookie's name. Example:

        $name = $c->name;
        $new_name = $c->name('fred');

value()

Get or set the cookie's value. Example:

        $value = $c->value;
        @new_value = $c->value(['a','b','c','d']);

value() 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.

domain()

Get or set the cookie's domain.

path()

Get or set the cookie's path.

expires()

Get or set the cookie's expiration time.

AUTHOR INFORMATION

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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