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<?php
/**
* Laconica, the distributed open-source microblogging tool
*
* Base class for RSS 1.0 feed actions
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Mail
* @package Laconica
* @author Evan Prodromou <evan@controlyourself.ca>
* @author Earle Martin <earle@downlode.org>
* @copyright 2008-9 Control Yourself, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://laconi.ca/
*/
if (!defined('LACONICA')) { exit(1); }
define('DEFAULT_RSS_LIMIT', 48);
class Rss10Action extends Action
{
# This will contain the details of each feed item's author and be used to generate SIOC data.
var $creators = array();
var $limit = DEFAULT_RSS_LIMIT;
/**
* Constructor
*
* Just wraps the Action constructor.
*
* @param string $output URI to output to, default = stdout
* @param boolean $indent Whether to indent output, default true
*
* @see Action::__construct
*/
function __construct($output='php://output', $indent=true)
{
parent::__construct($output, $indent);
}
/**
* Do we need to write to the database?
*
* @return boolean true
*/
function isReadonly()
{
return true;
}
/**
* Read arguments and initialize members
*
* @param array $args Arguments from $_REQUEST
* @return boolean success
*/
function prepare($args)
{
$this->limit = (int) $this->trimmed('limit');
if ($this->limit == 0) {
$this->limit = DEFAULT_RSS_LIMIT;
}
return true;
}
/**
* Handle a request
*
* @param array $args Arguments from $_REQUEST
*
* @return void
*/
function handle($args)
{
parent::handle($args);
$this->show_rss($limit);
}
/**
* Get the notices to output in this stream
*
* @return array an array of Notice objects sorted in reverse chron
*/
function getNotices()
{
return array();
}
/**
* Get a description of the channel
*
* Returns an array with the following
* @return array
*/
function get_channel()
{
return array('url' => '',
'title' => '',
'link' => '',
'description' => '');
}
function get_image()
{
return null;
}
function show_rss($limit=0)
{
$notices = $this->get_notices($limit);
$this->init_rss();
$this->show_channel($notices);
$this->show_image();
foreach ($notices as $n) {
$this->show_item($n);
}
$this->show_creators();
$this->end_rss();
}
function show_channel($notices)
{
$channel = $this->get_channel();
$image = $this->get_image();
common_element_start('channel', array('rdf:about' => $channel['url']));
common_element('title', null, $channel['title']);
common_element('link', null, $channel['link']);
common_element('description', null, $channel['description']);
common_element('cc:licence', array('rdf:resource' => common_config('license','url')));
if ($image) {
common_element('image', array('rdf:resource' => $image));
}
common_element_start('items');
common_element_start('rdf:Seq');
foreach ($notices as $notice) {
common_element('sioct:MicroblogPost', array('rdf:resource' => $notice->uri));
}
common_element_end('rdf:Seq');
common_element_end('items');
common_element_end('channel');
}
function show_image()
{
$image = $this->get_image();
if ($image) {
$channel = $this->get_channel();
common_element_start('image', array('rdf:about' => $image));
common_element('title', null, $channel['title']);
common_element('link', null, $channel['link']);
common_element('url', null, $image);
common_element_end('image');
}
}
function show_item($notice)
{
$profile = Profile::staticGet($notice->profile_id);
$nurl = common_local_url('shownotice', array('notice' => $notice->id));
$creator_uri = common_profile_uri($profile);
common_element_start('item', array('rdf:about' => $notice->uri));
$title = $profile->nickname . ': ' . common_xml_safe_str(trim($notice->content));
common_element('title', null, $title);
common_element('link', null, $nurl);
common_element('description', null, $profile->nickname."'s status on ".common_exact_date($notice->created));
common_element('dc:date', null, common_date_w3dtf($notice->created));
common_element('dc:creator', null, ($profile->fullname) ? $profile->fullname : $profile->nickname);
common_element('sioc:has_creator', array('rdf:resource' => $creator_uri));
common_element('laconica:postIcon', array('rdf:resource' => common_profile_avatar_url($profile)));
common_element('cc:licence', array('rdf:resource' => common_config('license', 'url')));
common_element_end('item');
$this->creators[$creator_uri] = $profile;
}
function show_creators()
{
foreach ($this->creators as $uri => $profile) {
$id = $profile->id;
$nickname = $profile->nickname;
common_element_start('sioc:User', array('rdf:about' => $uri));
common_element('foaf:nick', null, $nickname);
if ($profile->fullname) {
common_element('foaf:name', null, $profile->fullname);
}
common_element('sioc:id', null, $id);
$avatar = common_profile_avatar_url($profile);
common_element('sioc:avatar', array('rdf:resource' => $avatar));
common_element_end('sioc:User');
}
}
function init_rss()
{
$channel = $this->get_channel();
header('Content-Type: application/rdf+xml');
common_start_xml();
common_element_start('rdf:RDF', array('xmlns:rdf' =>
'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
'xmlns:dc' =>
'http://purl.org/dc/elements/1.1/',
'xmlns:cc' =>
'http://web.resource.org/cc/',
'xmlns:content' =>
'http://purl.org/rss/1.0/modules/content/',
'xmlns:foaf' =>
'http://xmlns.com/foaf/0.1/',
'xmlns:sioc' =>
'http://rdfs.org/sioc/ns#',
'xmlns:sioct' =>
'http://rdfs.org/sioc/types#',
'xmlns:laconica' =>
'http://laconi.ca/ont/',
'xmlns' => 'http://purl.org/rss/1.0/'));
common_element_start('sioc:Site', array('rdf:about' => common_root_url()));
common_element('sioc:name', null, common_config('site', 'name'));
common_element_start('sioc:container_of');
common_element('sioc:Container', array('rdf:about' =>
$channel['url']));
common_element_end('sioc:container_of');
common_element_end('sioc:Site');
}
function end_rss()
{
common_element_end('rdf:RDF');
}
}
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