perl5.005_03

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+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 1995,1996, 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.
+
+# The most recent version and complete docs are available at:
+#   http://www.genome.wi.mit.edu/ftp/pub/software/WWW/cgi_docs.html
+#   ftp://ftp-genome.wi.mit.edu/pub/software/WWW/
+
+$CGI::Cookie::VERSION='1.06';
+
+use CGI;
+use overload '""' => \&as_string,
+    'cmp' => \&compare,
+    'fallback'=>1;
+
+# 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 = $ENV{HTTP_COOKIE} || $ENV{COOKIE};
+    return () unless $raw_cookie;
+    return $class->parse($raw_cookie);
+}
+
+# fetch a list of cookies from the environment 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 = $ENV{HTTP_COOKIE} || $ENV{COOKIE};
+    return () unless $raw_cookie;
+    my %results;
+    my($key,$value);
+
+    my(@pairs) = split("; ",$raw_cookie);
+    foreach (@pairs) {
+	if (/^([^=]+)=(.*)/) {
+	    $key = $1;
+	    $value = $2;
+	}
+	else {
+	    $key = $_;
+	    $value = '';
+	}
+	$results{$key} = $value;
+    }
+    return \%results unless wantarray;
+    return %results;
+}
+
+sub parse {
+    my ($self,$raw_cookie) = @_;
+    my %results;
+
+    my(@pairs) = split("; ",$raw_cookie);
+    foreach (@pairs) {
+	my($key,$value) = split("=");
+	my(@values) = map CGI::unescape($_),split('&',$value);
+	$key = CGI::unescape($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,$expires) =
+	CGI->rearrange([NAME,[VALUE,VALUES],PATH,DOMAIN,SECURE,EXPIRES],@_);
+
+    # Pull out our parameters.
+    my @values;
+    if (ref($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],
+	},$class;
+
+    # IE requires the path to be present for some reason.
+    ($path = $ENV{'SCRIPT_NAME'})=~s![^/]+$!! unless $path;
+
+    $self->path($path) if defined $path;
+    $self->domain($domain) if defined $domain;
+    $self->secure($secure) if defined $secure;
+    $self->expires($expires) if defined $expires;
+    return $self;
+}
+
+sub as_string {
+    my $self = shift;
+    return "" unless $self->name;
+
+    my(@constant_values,$domain,$path,$expires,$secure);
+
+    push(@constant_values,"domain=$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,'secure') if $secure = $self->secure;
+
+    my($key) = CGI::escape($self->name);
+    my($cookie) = join("=",$key,join("&",map CGI::escape($_),$self->value));
+    return join("; ",$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;
+    $self->{'value'} = $value if defined $value;
+    return wantarray ? @{$self->{'value'}} : $self->{'value'}->[0]
+}
+
+sub domain {
+    my $self = shift;
+    my $domain = shift;
+    $self->{'domain'} = $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;
+    $self->{'expires'} = CGI::expires($expires,'cookie') if defined $expires;
+    return $self->{'expires'};
+}
+
+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, path is set to "/", which
+causes the cookie to be sent to any CGI script on your site.
+
+=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
+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: $c\n";
+  print "Content-Type: text/html\n\n";
+
+To send more than one cookie, create several Set-Cookie: fields.
+Alternatively, you may concatenate the cookies together with "; " and
+send them in one field.
+
+If you are using CGI.pm, you send cookies by providing a -cookie
+argument to the header() method:
+
+  print header(-cookie=>$c);
+
+Mod_perl users can set cookies using the request object's header_out()
+method:
+
+  $r->header_out('Set-Cookie',$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: ",$c->as_string,"\n";
+
+=head2 Recovering Previous Cookies
+
+	%cookies = fetch CGI::Cookie;
+
+B<fetch> returns an associative array consisting of all cookies
+returned by the browser.  The keys of the array are the cookie names.  You
+can iterate through the cookies this way:
+
+	%cookies = fetch CGI::Cookie;
+	foreach (keys %cookies) {
+	   do_something($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);
+
+=head2 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.
+
+=over 4
+
+=item B<name()>
+
+Get or set the cookie's name.  Example:
+
+	$name = $c->name;
+	$new_name = $c->name('fred');
+
+=item B<value()>
+
+Get or set the cookie's value.  Example:
+
+	$value = $c->value;
+	@new_value = $c->value(['a','b','c','d']);
+
+B<value()> is context sensitive.  In an array context it will return
+the current value of the cookie as an array.  In a scalar context it
+will return the B<first> value of a multivalued cookie.
+
+=item B<domain()>
+
+Get or set the cookie's domain.
+
+=item B<path()>
+
+Get or set the cookie's path.
+
+=item B<expires()>
+
+Get or set the cookie's expiration time.
+
+=back
+
+
+=head1 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
+
+=head1 BUGS
+
+This section intentionally left blank.
+
+=head1 SEE ALSO
+
+L<CGI::Carp>, L<CGI>
+ 
+=cut