| Atompub::Server(3pm) | User Contributed Perl Documentation | Atompub::Server(3pm) |
Atompub::Server - A server for the Atom Publishing Protocol
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;
$server->run;
Atompub::Server provides a base class for Atom Publishing Protocol servers. It handles all core server processing, and Basic and WSSE authentication. It can also run as either a mod_perl handler or as part of a CGI program.
It does not provide functions specific to any particular implementation, such as creating an entry, retrieving a list of entries, deleting an entry, etc. Implementations should subclass Atompub::Server, overriding the "handle_request" method, and handle all functions such as this themselves.
Atompub::Server extends XML::Atom::Server, and basically provides same functions. However, this module has been fixed based on the Atom Publishing Protocol described at <http://www.ietf.org/rfc/rfc5023.txt>, and supports Basic authentication rather than WSSE.
Subclasses of Atompub::Server must override the "handle_request" method to perform all request processing. The implementation must set all response headers, including the response code and any relevant HTTP headers, and should return a scalar representing the response body to be sent back to the client.
For example:
sub handle_request {
my($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);
}
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};
}
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".
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.
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.
If called with an argument, sets the realm for Basic authentication.
Returns the current realm that will be used when receiving requests.
Descriptions are found in XML::Atom::Server.
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.
XML::Atom XML::Atom::Service Atompub Catalyst::Controller::Atompub
Takeru INOUE, <takeru.inoue _ gmail.com>
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.
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| 2012-04-04 | perl v5.20.2 |