source: trunk/essentials/dev-lang/perl/lib/CGI/Cookie.pm

package CGI::Cookie;

# See the bottom of this file for the POD documentation.  Search for the
# string '=head'.

# You can run this file through either pod2man or pod2html to produce pretty
# documentation in manual or html file format (these utilities are part of the
# Perl 5 distribution).

# Copyright 1995-1999, Lincoln D. Stein.  All rights reserved.
# It may be used and modified freely, but I do request that this copyright
# notice remain attached to the file.  You may modify this module as you 
# wish, but if you redistribute a modified version, please attach a note
# listing the modifications you have made.

$CGI::Cookie::VERSION='1.26';

use CGI::Util qw(rearrange unescape escape);
use overload '""' => \&as_string,
    'cmp' => \&compare,
    'fallback'=>1;

# Turn on special checking for Doug MacEachern's modperl
my $MOD_PERL = 0;
if (exists $ENV{MOD_PERL}) {
  if (exists $ENV{MOD_PERL_API_VERSION} && $ENV{MOD_PERL_API_VERSION} == 2) {
      $MOD_PERL = 2;
      require Apache2::RequestUtil;
      require APR::Table;
  } else {
    $MOD_PERL = 1;
    require Apache;
  }
}

# fetch a list of cookies from the environment and
# return as a hash.  the cookies are parsed as normal
# escaped URL data.
sub fetch {
    my $class = shift;
    my $raw_cookie = get_raw_cookie(@_) or return;
    return $class->parse($raw_cookie);
}

# Fetch a list of cookies from the environment or the incoming headers and
# return as a hash. The cookie values are not unescaped or altered in any way.
 sub raw_fetch {
   my $class = shift;
   my $raw_cookie = get_raw_cookie(@_) or return;
   my %results;
   my($key,$value);
   
   my(@pairs) = split("; ?",$raw_cookie);
   foreach (@pairs) {
     s/\s*(.*?)\s*/$1/;
     if (/^([^=]+)=(.*)/) {
       $key = $1;
       $value = $2;
     }
     else {
       $key = $_;
       $value = '';
     }
     $results{$key} = $value;
   }
   return \%results unless wantarray;
   return %results;
}

sub get_raw_cookie {
  my $r = shift;
  $r ||= eval { $MOD_PERL == 2                    ? 
                  Apache2::RequestUtil->request() :
                  Apache->request } if $MOD_PERL;
  if ($r) {
    $raw_cookie = $r->headers_in->{'Cookie'};
  } else {
    if ($MOD_PERL && !exists $ENV{REQUEST_METHOD}) {
      die "Run $r->subprocess_env; before calling fetch()";
    }
    $raw_cookie = $ENV{HTTP_COOKIE} || $ENV{COOKIE};
  }
}


sub parse {
  my ($self,$raw_cookie) = @_;
  my %results;

  my(@pairs) = split("; ?",$raw_cookie);
  foreach (@pairs) {
    s/\s*(.*?)\s*/$1/;
    my($key,$value) = split("=",$_,2);

    # Some foreign cookies are not in name=value format, so ignore
    # them.
    next if !defined($value);
    my @values = ();
    if ($value ne '') {
      @values = map unescape($_),split(/[&;]/,$value.'&dmy');
      pop @values;
    }
    $key = unescape($key);
    # A bug in Netscape can cause several cookies with same name to
    # appear.  The FIRST one in HTTP_COOKIE is the most recent version.
    $results{$key} ||= $self->new(-name=>$key,-value=>\@values);
  }
  return \%results unless wantarray;
  return %results;
}

sub new {
  my $class = shift;
  $class = ref($class) if ref($class);
  my($name,$value,$path,$domain,$secure,$expires) =
    rearrange([NAME,[VALUE,VALUES],PATH,DOMAIN,SECURE,EXPIRES],@_);
  
  # Pull out our parameters.
  my @values;
  if (ref($value)) {
    if (ref($value) eq 'ARRAY') {
      @values = @$value;
    } elsif (ref($value) eq 'HASH') {
      @values = %$value;
    }
  } else {
    @values = ($value);
  }
  
  bless my $self = {
                    'name'=>$name,
                    'value'=>[@values],
                   },$class;

  # IE requires the path and domain to be present for some reason.
  $path   ||= "/";
  # however, this breaks networks which use host tables without fully qualified
  # names, so we comment it out.
  #    $domain = CGI::virtual_host()    unless defined $domain;

  $self->path($path)     if defined $path;
  $self->domain($domain) if defined $domain;
  $self->secure($secure) if defined $secure;
  $self->expires($expires) if defined $expires;
#  $self->max_age($expires) if defined $expires;
  return $self;
}

sub as_string {
    my $self = shift;
    return "" unless $self->name;

    my(@constant_values,$domain,$path,$expires,$max_age,$secure);

    push(@constant_values,"domain=$domain")   if $domain = $self->domain;
    push(@constant_values,"path=$path")       if $path = $self->path;
    push(@constant_values,"expires=$expires") if $expires = $self->expires;
    push(@constant_values,"max-age=$max_age") if $max_age = $self->max_age;
    push(@constant_values,"secure") if $secure = $self->secure;

    my($key) = escape($self->name);
    my($cookie) = join("=",($key||''),join("&",map escape($_||''),$self->value));
    return join("; ",$cookie,@constant_values);
}

sub compare {
    my $self = shift;
    my $value = shift;
    return "$self" cmp $value;
}

# accessors
sub name {
    my $self = shift;
    my $name = shift;
    $self->{'name'} = $name if defined $name;
    return $self->{'name'};
}

sub value {
    my $self = shift;
    my $value = shift;
      if (defined $value) {
              my @values;
        if (ref($value)) {
            if (ref($value) eq 'ARRAY') {
                @values = @$value;
            } elsif (ref($value) eq 'HASH') {
                @values = %$value;
            }
        } else {
            @values = ($value);
        }
      $self->{'value'} = [@values];
      }
    return wantarray ? @{$self->{'value'}} : $self->{'value'}->[0]
}

sub domain {
    my $self = shift;
    my $domain = shift;
    $self->{'domain'} = lc $domain if defined $domain;
    return $self->{'domain'};
}

sub secure {
    my $self = shift;
    my $secure = shift;
    $self->{'secure'} = $secure if defined $secure;
    return $self->{'secure'};
}

sub expires {
    my $self = shift;
    my $expires = shift;
    $self->{'expires'} = CGI::Util::expires($expires,'cookie') if defined $expires;
    return $self->{'expires'};
}

sub max_age {
  my $self = shift;
  my $expires = shift;
  $self->{'max-age'} = CGI::Util::expire_calc($expires)-time() if defined $expires;
  return $self->{'max-age'};
}

sub path {
    my $self = shift;
    my $path = shift;
    $self->{'path'} = $path if defined $path;
    return $self->{'path'};
}

1;

=head1 NAME

CGI::Cookie - Interface to Netscape Cookies

=head1 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});

=head1 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

=head1 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:

=over 4

=item B<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.

=item B<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.

=item B<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.

=item B<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.

=back

=head2 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 B<new> method.  The B<-name> and
B<-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).

B<-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.

B<-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.

B<-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.

B<-secure> if set to a true value instructs the browser to return the
cookie only when a cryptographic protocol is in use.

=head2 Sending the Cookie to the Browser

Within a CGI script you can send a cookie to the browser by creating