112 lines
2.6 KiB
Perl
112 lines
2.6 KiB
Perl
package Lemonldap::NG::Manager::Base;
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use strict;
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use MIME::Base64;
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use Time::Local;
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use CGI;
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our $VERSION = '0.2';
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our @ISA = qw(CGI);
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sub header {
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my $self = shift;
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$self->SUPER::header(@_);
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}
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sub header_public {
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my $self = shift;
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my $filename = shift;
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$filename ||= $ENV{SCRIPT_FILENAME};
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my @tmp = stat($filename);
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my $date = $tmp[9];
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my $hd = gmtime($date);
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$hd =~ s/^(\w+)\s+(\w+)\s+(\d+)\s+([\d:]+)\s+(\d+)$/$1, $3 $2 $5 $4 GMT/;
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my $year = $5;
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my $cm = $2;
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# TODO: Remove TODO_ for stable releases
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if ( my $ref = $ENV{TODO_HTTP_IF_MODIFIED_SINCE} ) {
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my %month = (
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jan => 0,
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feb => 1,
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mar => 2,
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apr => 3,
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may => 4,
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jun => 5,
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jul => 6,
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aug => 7,
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sep => 8,
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oct => 9,
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nov => 10,
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dec => 11
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);
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if ( $ref =~ /^\w+,\s+(\d+)\s+(\w+)\s+(\d+)\s+(\d+):(\d+):(\d+)/ ) {
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my $m = $month{ lc($2) };
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$year-- if ( $m > $month{ lc($cm) } );
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$ref = timegm( $6, $5, $4, $1, $m, $3 );
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if ( $ref == $date ) {
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print $self->SUPER::header( -status => '304 Not Modified', @_ );
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exit;
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}
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}
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}
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return $self->SUPER::header(
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'-Last-Modified' => $hd,
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'-Cache-Control' => 'public; must-revalidate',
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@_
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);
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}
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1;
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__END__
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=head1 NAME
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Lemonldap::NG::Manager::Base - Simple module to extend L<CGI> to manage
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HTTP "If-Modified-Since / 304 Not Modified" system.
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=head1 SYNOPSIS
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use Lemonldap::NG::Manager::Base;
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my $cgi = Lemonldap::NG::Manager::Base->new();
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$cgi->header_public($ENV{SCRIPT_FILENAME});
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print "<html><head><title>Static page</title></head>";
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...
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=head1 DESCRIPTION
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Lemonldap::NG::Manager::Base just add header_public subroutine to CGI module to
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avoid printing HTML elements that can be cached.
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=head1 METHODS
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=head2 header_public
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header_public works like header (see L<CGI>) but the first argument has to be
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a filename: the last modify date of this file is used for reference.
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=head2 EXPORT
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=head1 SEE ALSO
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L<Lemonldap::NG::Manager>, L<CGI>,
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http://wiki.lemonldap.objectweb.org/xwiki/bin/view/NG/Presentation
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=head1 AUTHOR
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Xavier Guimard, E<lt>x.guimard@free.frE<gt>
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=head1 COPYRIGHT AND LICENSE
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Copyright (C) 2006-2007 by Xavier Guimard E<lt>x.guimard@free.frE<gt>
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This library is free software; you can redistribute it and/or modify
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it under the same terms as Perl itself, either Perl version 5.8.4 or,
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at your option, any later version of Perl 5 you may have available.
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=cut
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