363 lines
12 KiB
PHP
363 lines
12 KiB
PHP
<?php
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/**
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* Laconica, the distributed open-source microblogging tool
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*
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* Base class for RSS 1.0 feed actions
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Mail
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* @package Laconica
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* @author Evan Prodromou <evan@controlyourself.ca>
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* @author Earle Martin <earle@downlode.org>
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* @copyright 2008-9 Control Yourself, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://laconi.ca/
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*/
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if (!defined('LACONICA')) { exit(1); }
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define('DEFAULT_RSS_LIMIT', 48);
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class Rss10Action extends Action
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{
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# 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();
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var $limit = DEFAULT_RSS_LIMIT;
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var $notices = null;
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/**
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* Constructor
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*
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* Just wraps the Action constructor.
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*
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* @param string $output URI to output to, default = stdout
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* @param boolean $indent Whether to indent output, default true
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*
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* @see Action::__construct
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*/
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function __construct($output='php://output', $indent=true)
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{
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parent::__construct($output, $indent);
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}
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/**
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* Do we need to write to the database?
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*
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* @return boolean true
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*/
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function isReadonly()
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{
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return true;
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}
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/**
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* Read arguments and initialize members
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*
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* @param array $args Arguments from $_REQUEST
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* @return boolean success
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*/
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function prepare($args)
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{
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parent::prepare($args);
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$this->limit = (int) $this->trimmed('limit');
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if ($this->limit == 0) {
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$this->limit = DEFAULT_RSS_LIMIT;
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}
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return true;
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}
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/**
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* Handle a request
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*
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* @param array $args Arguments from $_REQUEST
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*
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* @return void
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*/
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function handle($args)
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{
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// Parent handling, including cache check
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parent::handle($args);
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// Get the list of notices
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if (empty($this->tag)) {
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$this->notices = $this->getNotices($this->limit);
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} else {
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$this->notices = $this->getTaggedNotices($this->tag, $this->limit);
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}
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$this->showRss();
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}
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/**
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* Get the notices to output in this stream
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*
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* @return array an array of Notice objects sorted in reverse chron
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*/
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function getNotices()
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{
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return array();
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}
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/**
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* Get a description of the channel
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*
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* Returns an array with the following
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* @return array
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*/
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function getChannel()
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{
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return array('url' => '',
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'title' => '',
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'link' => '',
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'description' => '');
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}
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function getImage()
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{
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return null;
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}
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function showRss()
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{
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$this->initRss();
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$this->showChannel();
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$this->showImage();
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foreach ($this->notices as $n) {
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$this->showItem($n);
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}
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$this->showCreators();
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$this->endRss();
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}
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function showChannel()
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{
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$channel = $this->getChannel();
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$image = $this->getImage();
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$this->elementStart('channel', array('rdf:about' => $channel['url']));
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$this->element('title', null, $channel['title']);
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$this->element('link', null, $channel['link']);
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$this->element('description', null, $channel['description']);
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$this->element('cc:licence', array('rdf:resource' => common_config('license','url')));
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if ($image) {
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$this->element('image', array('rdf:resource' => $image));
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}
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$this->elementStart('items');
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$this->elementStart('rdf:Seq');
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foreach ($this->notices as $notice) {
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$this->element('rdf:li', array('rdf:resource' => $notice->uri));
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}
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$this->elementEnd('rdf:Seq');
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$this->elementEnd('items');
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$this->elementEnd('channel');
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}
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function showImage()
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{
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$image = $this->getImage();
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if ($image) {
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$channel = $this->getChannel();
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$this->elementStart('image', array('rdf:about' => $image));
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$this->element('title', null, $channel['title']);
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$this->element('link', null, $channel['link']);
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$this->element('url', null, $image);
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$this->elementEnd('image');
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}
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}
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// XXX: Surely there should be a common function to do this?
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function extract_tags ($string)
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{
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$count = preg_match_all('/(?:^|\s)#([A-Za-z0-9_\-\.]{1,64})/', strtolower($string), $match);
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if (!count)
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{
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return array();
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}
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$rv = array();
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foreach ($match[1] as $tag)
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{
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$rv[] = common_canonical_tag($tag);
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}
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return array_unique($rv);
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}
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function showItem($notice)
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{
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$profile = Profile::staticGet($notice->profile_id);
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$nurl = common_local_url('shownotice', array('notice' => $notice->id));
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$creator_uri = common_profile_uri($profile);
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$this->elementStart('item', array('rdf:about' => $notice->uri,
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'rdf:type' => 'http://rdfs.org/sioc/types#MicroblogPost'));
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$title = $profile->nickname . ': ' . common_xml_safe_str(trim($notice->content));
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$this->element('title', null, $title);
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$this->element('link', null, $nurl);
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$this->element('description', null, $profile->nickname."'s status on ".common_exact_date($notice->created));
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if ($notice->rendered) {
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$this->element('content:encoded', null, common_xml_safe_str($notice->rendered));
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}
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$this->element('dc:date', null, common_date_w3dtf($notice->created));
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$this->element('dc:creator', null, ($profile->fullname) ? $profile->fullname : $profile->nickname);
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$this->element('foaf:maker', array('rdf:resource' => $creator_uri));
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$this->element('sioc:has_creator', array('rdf:resource' => $creator_uri.'#acct'));
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$this->element('laconica:postIcon', array('rdf:resource' => $profile->avatarUrl()));
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$this->element('cc:licence', array('rdf:resource' => common_config('license', 'url')));
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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' => $replyurl));
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}
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$attachments = $notice->attachments();
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if($attachments){
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foreach($attachments as $attachment){
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if ($attachment->isEnclosure()) {
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// DO NOT move xmlns declaration to root element. Making it
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// the default namespace here improves compatibility with
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// real-world feed readers.
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$attribs = array(
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'rdf:resource' => $attachment->url,
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'url' => $attachment->url,
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'xmlns' => 'http://purl.oclc.org/net/rss_2.0/enc#'
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);
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if ($attachment->title) {
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$attribs['dc:title'] = $attachment->title;
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}
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if ($attachment->modified) {
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$attribs['dc:date'] = common_date_w3dtf($attachment->modified);
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}
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if ($attachment->size) {
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$attribs['length'] = $attachment->size;
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}
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if ($attachment->mimetype) {
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$attribs['type'] = $attachment->mimetype;
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}
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$this->element('enclosure', $attribs);
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}
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$this->element('sioc:links_to', array('rdf:resource'=>$attachment->url));
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}
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}
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$tags = $this->extract_tags($notice->content);
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if (!empty($tags)) {
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foreach ($tags as $tag)
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{
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$tagpage = common_local_url('tag', array('tag' => $tag));
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$tagrss = common_local_url('tagrss', array('tag' => $tag));
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$this->elementStart('ctag:tagged');
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$this->elementStart('ctag:Tag', array('rdf:about'=>$tagpage.'#concept', 'ctag:label'=>$tag));
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$this->element('foaf:page', array('rdf:resource'=>$tagpage));
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$this->element('rdfs:seeAlso', array('rdf:resource'=>$tagrss));
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$this->elementEnd('ctag:Tag');
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$this->elementEnd('ctag:tagged');
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}
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}
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$this->elementEnd('item');
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$this->creators[$creator_uri] = $profile;
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}
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function showCreators()
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{
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foreach ($this->creators as $uri => $profile) {
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$id = $profile->id;
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$nickname = $profile->nickname;
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$this->elementStart('foaf:Agent', array('rdf:about' => $uri));
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$this->element('foaf:nick', null, $nickname);
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if ($profile->fullname) {
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$this->element('foaf:name', null, $profile->fullname);
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}
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$this->element('foaf:holdsAccount', array('rdf:resource' => $uri.'#acct'));
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$avatar = $profile->avatarUrl();
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$this->element('foaf:depiction', array('rdf:resource' => $avatar));
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$this->elementEnd('foaf:Agent');
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}
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}
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function initRss()
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{
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$channel = $this->getChannel();
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header('Content-Type: application/rdf+xml');
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$this->startXml();
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$this->elementStart('rdf:RDF', array('xmlns:rdf' =>
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'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
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'xmlns:dc' =>
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'http://purl.org/dc/elements/1.1/',
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'xmlns:cc' =>
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'http://creativecommons.org/ns#',
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'xmlns:content' =>
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'http://purl.org/rss/1.0/modules/content/',
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'xmlns:ctag' =>
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'http://commontag.org/ns#',
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'xmlns:foaf' =>
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'http://xmlns.com/foaf/0.1/',
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'xmlns:sioc' =>
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'http://rdfs.org/sioc/ns#',
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'xmlns:sioct' =>
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'http://rdfs.org/sioc/types#',
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'xmlns:rdfs' =>
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'http://www.w3.org/2000/01/rdf-schema#',
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'xmlns:laconica' =>
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'http://laconi.ca/ont/',
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'xmlns' => 'http://purl.org/rss/1.0/'));
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$this->elementStart('sioc:Site', array('rdf:about' => common_root_url()));
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$this->element('sioc:name', null, common_config('site', 'name'));
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$this->elementStart('sioc:space_of');
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$this->element('sioc:Container', array('rdf:about' =>
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$channel['url']));
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$this->elementEnd('sioc:space_of');
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$this->elementEnd('sioc:Site');
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}
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function endRss()
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{
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$this->elementEnd('rdf:RDF');
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}
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/**
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* When was this page last modified?
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*
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*/
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function lastModified()
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{
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if (empty($this->notices)) {
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return null;
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}
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if (count($this->notices) == 0) {
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return null;
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}
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// FIXME: doesn't handle modified profiles, avatars, deleted notices
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return strtotime($this->notices[0]->created);
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}
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}
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