Atompub::Server(3) A server for the Atom Publishing Protocol

SYNOPSIS


package My::Server;
use base qw(Atompub::Server);
sub handle_request {
my($server) = @_;
$server->authenticate or return;
my $method = $server->request_method;
if ($method eq 'POST') {
return $server->new_post;
}
...
}
my %Passwords;
sub password_for_user {
my($server, $username) = @_;
$Passwords{$username};
}
sub new_post {
my($server) = @_;
my $entry = $server->atom_body or return;
# $entry is an XML::Atom::Entry object.
# ... Save the new entry ...
}
package main;
my $server = My::Server->new;
$server->run;

DESCRIPTION

Atompub::Server provides a base class for Atom Publishing Protocol servers. It handles all core server processing, and Basic and WSSE authentication. It can also run as either a mod_perl handler or as part of a CGI program.

It does not provide functions specific to any particular implementation, such as creating an entry, retrieving a list of entries, deleting an entry, etc. Implementations should subclass Atompub::Server, overriding the "handle_request" method, and handle all functions such as this themselves.

Atompub::Server extends XML::Atom::Server, and basically provides same functions. However, this module has been fixed based on the Atom Publishing Protocol described at <http://www.ietf.org/rfc/rfc5023.txt>, and supports Basic authentication rather than WSSE.

SUBCLASSING

Request Handling

Subclasses of Atompub::Server must override the "handle_request" method to perform all request processing. The implementation must set all response headers, including the response code and any relevant HTTP headers, and should return a scalar representing the response body to be sent back to the client.

For example: 

    sub handle_request {
        my($server) = @_;
        my $method = $server->request_method;
        if ($method eq 'POST') {
            return $server->new_post;
        }
        # ... handle GET, PUT, etc
    }
    sub new_post {
        my($server) = @_;
        my $entry = $server->atom_body or return;
        # Implementation-specific
        my $id = save_this_entry($entry);
        my $location = join '/', $server->uri, $id;
        my $etag = calc_etag($entry);
        $server->response_header(Location => $location);
        $server->response_header(ETag     => $etag    );
        $server->response_code(RC_CREATED);
        $server->response_content_type('application/atom+xml;type=entry');
        # Implementation-specific
        return serialize_entry($entry);
    }

Authentication

Servers that require authentication should override the "password_for_user" method. Given a username (from the Authorization or WSSE header), "password_for_user" should return that user's password in plaintext. If the supplied username doesn't exist in your user database or alike, just return "undef".

For example: 

    my %Passwords = (foo => 'bar');   # The password for "foo" is "bar".
    sub password_for_user {
        my($server, $username) = @_;
        $Passwords{$username};
    }
  • Basic Authentication

    realm must be assigned before authentication for Basic authentication. 

        $server->realm('MySite');

    If your server runs as a CGI program and authenticates by Basic authenticate, you should use authentication mechanism of the http server, like ".htaccess".

  • WSSE Authentication

    Any pre-configuration is not required for WSSE. The password returned from "password_for_user" will be combined with the nonce and the creation time to generate the digest, which will be compared with the digest sent in the WSSE header.

METHODS

Atompub::Server provides a variety of methods to be used by subclasses for retrieving headers, content, and other request information, and for setting the same on the response.

$server->realm

If called with an argument, sets the realm for Basic authentication.

Returns the current realm that will be used when receiving requests.

$server->send_http_header($content_type)

$server->get_auth_info

$server->authenticate

$server->auth_failure($status, $message)

oether methods

Descriptions are found in XML::Atom::Server.

USAGE

Once you have defined your server subclass, you can set it up either as a CGI program or as a mod_perl handler.

See XML::Atom::Server in details.

AUTHOR

Takeru INOUE, <takeru.inoue _ gmail.com>

LICENCE AND COPYRIGHT

Copyright (c) 2007, Takeru INOUE "<takeru.inoue _ gmail.com>". 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.

DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE ``AS IS'' WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

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