NAME

Blosxom::Header - Missing interface to modify HTTP headers

SYNOPSIS

  # blosxom.cgi
  package blosxom;
  our $header = { foo => 'bar' };

  # plugins/foo
  package foo;
  use Blosxom::Header qw(get_header set_header has_header remove_header);

  # Functional interface
  my $value = get_header( $blosxom::header, 'foo' );
  my $bool  = has_header( $blosxom::header, 'foo' );
  set_header( $blosxom::header, 'bar' => 'baz' );
  remove_header( $blosxom::header, 'foo' );

  # OO interface
  my $h     = Blosxom::Header->new( $blosxom::header );
  my $value = $h->get('foo');
  my $bool  = $h->has('foo');
  $h->set( bar => 'baz' );
  $h->remove('foo');

DESCRIPTION

Blosxom, a weblog application, exports a global variable $header which is a reference to hash. This application passes $header CGI::header() to generate HTTP headers.

When plugin developers modify HTTP headers, they must write as follows:

  package foo;
  $blosxom::header->{'-status'} = '304 Not Modified';

It's obviously bad practice. Blosxom misses the interface to modify them.

This module provieds you an OO interface:

  use Blosxom::Header;
  my $h = Blosxom::Header->new( $blosxom::header );
  $h->set( 'Status' => '304 Not Modified' );

or a functional one:

  use Blosxom::Header qw(set_header);
  set_header( $blosxom::header, 'Status' => '304 Not Modified' );

You don't need to mind whether to put a hyphen before a key, nor whether to make a key lowercased or camelized.

SUBROUTINES

The following are exported on demand.

get_header( $blosxom::header, 'foo' )

Returns a value of the specified HTTP header.

set_header( $blosxom::header, 'foo' => 'bar' )

Sets a value of the specified HTTP header.

has_header( $blosxom::header, 'foo' )

Returns a Boolean value telling whether the specified HTTP header exists.

remove_header( $blosxom::header, 'foo' )

Deletes the specified element from HTTP headers.

METHODS

$h = Blosxom::Header->new( $blosxom::header )

Creates a new Blosxom::Header object.

$h->has( 'foo' )

A synonym for has_header.

$h->get( 'foo' )

A synonym for get_header.

$h->remove( 'foo' )

A synonym for remove_header.

$h->set( 'foo' => 'bar' )

A synonym for set_header.

EXAMPLES

CGI::header recognizes the following parameters.

attachment

Can be used to turn the page into an attachment. Represents suggested name for the saved file.

  $h->set(attachment => 'foo.png');

In this case, the outgoing header will be formatted as:

  Content-Disposition: attachment; filename="foo.png"

charset

Represents the character set sent to the browser. If not provided, defaults to ISO-8859-1.

  $h->set(charset => 'utf-8');

cookie

Represents the Set-Cookie header. The parameter can be an arrayref or a string.

  $h->set(cookie => [$cookie1, $cookie2]);
  $h->set(cookie => $cookie);

Refer to CGI::cookie.

expires

Represents the Expires header. You can specify an absolute or relative expiration interval. The following forms are all valid for this field.

  $h->set(expires => '+30s'); # 30 seconds from now
  $h->set(expires => '+10m'); # ten minutes from now
  $h->set(expires => '+1h' ); # one hour from now
  $h->set(expires => '-1d' ); # yesterday
  $h->set(expires => 'now' ); # immediately
  $h->set(expires => '+3M' ); # in three months
  $h->set(expires => '+10y'); # in ten years time

  # at the indicated time & date
  $h->set(expires => 'Thu, 25 Apr 1999 00:40:33 GMT');

nph

If set to a true value, will issue the correct headers to work with a NPH (no-parse-header) script:

  $h->set(nph => 1);

p3p

Will add a P3P tag to the outgoing header. The parameter can be an arrayref or a space-delimited string.

  $h->set(p3p => [qw(CAO DSP LAW CURa)]);
  $h->set(p3p => 'CAO DSP LAW CURa');

In either case, the outgoing header will be formatted as:

  P3P: policyref="/w3c/p3p.xml" cp="CAO DSP LAW CURa"

type

Represents the Content-Type header.

  $h->set(type => 'text/plain');

DEPENDENCIES

Blosxom 2.1.2

SEE ALSO

CGI

AUTHOR

Ryo Anazawa (anazawa@cpan.org)

LICENSE AND COPYRIGHT

Copyright (c) 2011 Ryo Anazawa. All rights reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

cpanm Blosxom::Header

perl -MCPAN -e shell
install Blosxom::Header