gnu-social/lib/rssaction.php

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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.
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var $creators = array();
var $limit = DEFAULT_RSS_LIMIT;
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var $notices = null;
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/**
* 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?
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*
* @return boolean true
*/
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function isReadonly()
{
return true;
}
/**
* Read arguments and initialize members
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*
* @param array $args Arguments from $_REQUEST
* @return boolean success
*/
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function prepare($args)
{
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parent::prepare($args);
$this->limit = (int) $this->trimmed('limit');
if ($this->limit == 0) {
$this->limit = DEFAULT_RSS_LIMIT;
}
return true;
}
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/**
* Handle a request
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*
* @param array $args Arguments from $_REQUEST
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*
* @return void
*/
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function handle($args)
{
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// Parent handling, including cache check
parent::handle($args);
// Get the list of notices
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if (empty($this->tag)) {
$this->notices = $this->getNotices($this->limit);
} else {
$this->notices = $this->getTaggedNotices($this->tag, $this->limit);
}
$this->showRss();
}
/**
* Get the notices to output in this stream
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*
* @return array an array of Notice objects sorted in reverse chron
*/
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function getNotices()
{
return array();
}
/**
* Get a description of the channel
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*
* Returns an array with the following
* @return array
*/
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function getChannel()
{
return array('url' => '',
'title' => '',
'link' => '',
'description' => '');
}
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function getImage()
{
return null;
}
function showRss()
{
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$this->initRss();
$this->showChannel();
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$this->showImage();
foreach ($this->notices as $n) {
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$this->showItem($n);
}
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$this->showCreators();
$this->endRss();
}
function showChannel()
{
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$channel = $this->getChannel();
$image = $this->getImage();
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$this->elementStart('channel', array('rdf:about' => $channel['url']));
$this->element('title', null, $channel['title']);
$this->element('link', null, $channel['link']);
$this->element('description', null, $channel['description']);
$this->element('cc:licence', array('rdf:resource' => common_config('license','url')));
if ($image) {
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$this->element('image', array('rdf:resource' => $image));
}
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$this->elementStart('items');
$this->elementStart('rdf:Seq');
foreach ($this->notices as $notice) {
$this->element('rdf:li', array('rdf:resource' => $notice->uri));
}
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$this->elementEnd('rdf:Seq');
$this->elementEnd('items');
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$this->elementEnd('channel');
}
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function showImage()
{
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$image = $this->getImage();
if ($image) {
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$channel = $this->getChannel();
$this->elementStart('image', array('rdf:about' => $image));
$this->element('title', null, $channel['title']);
$this->element('link', null, $channel['link']);
$this->element('url', null, $image);
$this->elementEnd('image');
}
}
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// XXX: Surely there should be a common function to do this?
function extract_tags ($string)
{
$count = preg_match_all('/(?:^|\s)#([A-Za-z0-9_\-\.]{1,64})/', strtolower($string), $match);
if (!count)
{
return array();
}
$rv = array();
foreach ($match[1] as $tag)
{
$rv[] = common_canonical_tag($tag);
}
return array_unique($rv);
}
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function showItem($notice)
{
$profile = Profile::staticGet($notice->profile_id);
$nurl = common_local_url('shownotice', array('notice' => $notice->id));
$creator_uri = common_profile_uri($profile);
$this->elementStart('item', array('rdf:about' => $notice->uri,
'rdf:type' => 'http://rdfs.org/sioc/types#MicroblogPost'));
$title = $profile->nickname . ': ' . common_xml_safe_str(trim($notice->content));
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$this->element('title', null, $title);
$this->element('link', null, $nurl);
$this->element('description', null, $profile->nickname."'s status on ".common_exact_date($notice->created));
if ($notice->rendered) {
$this->element('content:encoded', null, common_xml_safe_str($notice->rendered));
}
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$this->element('dc:date', null, common_date_w3dtf($notice->created));
$this->element('dc:creator', null, ($profile->fullname) ? $profile->fullname : $profile->nickname);
$this->element('foaf:maker', array('rdf:resource' => $creator_uri));
$this->element('sioc:has_creator', array('rdf:resource' => $creator_uri.'#acct'));
$this->element('laconica:postIcon', array('rdf:resource' => $profile->avatarUrl()));
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$this->element('cc:licence', array('rdf:resource' => common_config('license', 'url')));
if ($notice->reply_to) {
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$replyurl = common_local_url('shownotice', array('notice' => $notice->reply_to));
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$this->element('sioc:reply_of', array('rdf:resource' => $replyurl));
}
$attachments = $notice->attachments();
if($attachments){
foreach($attachments as $attachment){
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if (isset($attachment->filename)) {
// DO NOT move xmlns declaration to root element. Making it
// the default namespace here improves compatibility with
// real-world feed readers.
$attribs = array(
'rdf:resource' => $attachment->url,
'url' => $attachment->url,
'xmlns' => 'http://purl.oclc.org/net/rss_2.0/enc#'
);
if ($attachment->title) {
$attribs['dc:title'] = $attachment->title;
}
if ($attachment->modified) {
$attribs['dc:date'] = common_date_w3dtf($attachment->modified);
}
if ($attachment->size) {
$attribs['length'] = $attachment->size;
}
if ($attachment->mimetype) {
$attribs['type'] = $attachment->mimetype;
}
$this->element('enclosure', $attribs);
}
$this->element('sioc:links_to', array('rdf:resource'=>$attachment->url));
}
}
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$tags = $this->extract_tags($notice->content);
if (!empty($tags)) {
foreach ($tags as $tag)
{
$tagpage = common_local_url('tag', array('tag' => $tag));
$tagrss = common_local_url('tagrss', array('tag' => $tag));
$this->elementStart('ctag:tagged');
$this->elementStart('ctag:Tag', array('rdf:about'=>$tagpage.'#concept', 'ctag:label'=>$tag));
$this->element('foaf:page', array('rdf:resource'=>$tagpage));
$this->element('rdfs:seeAlso', array('rdf:resource'=>$tagrss));
$this->elementEnd('ctag:Tag');
$this->elementEnd('ctag:tagged');
}
}
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$this->elementEnd('item');
$this->creators[$creator_uri] = $profile;
}
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function showCreators()
{
foreach ($this->creators as $uri => $profile) {
$id = $profile->id;
$nickname = $profile->nickname;
$this->elementStart('foaf:Agent', array('rdf:about' => $uri));
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$this->element('foaf:nick', null, $nickname);
if ($profile->fullname) {
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$this->element('foaf:name', null, $profile->fullname);
}
$this->element('foaf:holdsAccount', array('rdf:resource' => $uri.'#acct'));
$avatar = $profile->avatarUrl();
$this->element('foaf:depiction', array('rdf:resource' => $avatar));
$this->elementEnd('foaf:Agent');
}
}
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function initRss()
{
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$channel = $this->getChannel();
header('Content-Type: application/rdf+xml');
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$this->startXml();
$this->elementStart('rdf:RDF', array('xmlns:rdf' =>
'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
'xmlns:dc' =>
'http://purl.org/dc/elements/1.1/',
'xmlns:cc' =>
'http://creativecommons.org/ns#',
'xmlns:content' =>
'http://purl.org/rss/1.0/modules/content/',
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'xmlns:ctag' =>
'http://commontag.org/ns#',
'xmlns:foaf' =>
'http://xmlns.com/foaf/0.1/',
'xmlns:sioc' =>
'http://rdfs.org/sioc/ns#',
'xmlns:sioct' =>
'http://rdfs.org/sioc/types#',
'xmlns:laconica' =>
'http://laconi.ca/ont/',
'xmlns' => 'http://purl.org/rss/1.0/'));
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$this->elementStart('sioc:Site', array('rdf:about' => common_root_url()));
$this->element('sioc:name', null, common_config('site', 'name'));
$this->elementStart('sioc:space_of');
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$this->element('sioc:Container', array('rdf:about' =>
$channel['url']));
$this->elementEnd('sioc:space_of');
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$this->elementEnd('sioc:Site');
}
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function endRss()
{
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$this->elementEnd('rdf:RDF');
}
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/**
* When was this page last modified?
*
*/
function lastModified()
{
if (empty($this->notices)) {
return null;
}
if (count($this->notices) == 0) {
return null;
}
// FIXME: doesn't handle modified profiles, avatars, deleted notices
return strtotime($this->notices[0]->created);
}
}
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