lib/rssaction.php

   1 <?php
   2 /*
   3  * Laconica - a distributed open-source microblogging tool
   4  * Copyright (C) 2008, Controlez-Vous, Inc.
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU Affero General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 if (!defined('LACONICA')) { exit(1); }
  21
  22 class Rss10Action extends Action {
  23
  24         function handle($args) {
  25                 parent::handle($args);
  26
  27                 $limit = (int) $this->trimmed('limit');
  28
  29                 $this->show_rss($limit);
  30         }
  31
  32         function init() {
  33                 return true;
  34         }
  35
  36         function get_notices() {
  37                 return array();
  38         }
  39
  40         function get_channel() {
  41                 return array('url' => '',
  42                                          'title' => '',
  43                                          'link' => '',
  44                                          'description' => '');
  45         }
  46
  47         function get_image() {
  48                 return NULL;
  49         }
  50
  51         function show_rss($limit=0) {
  52
  53                 if (!$this->init()) {
  54                         return;
  55                 }
  56
  57                 $notices = $this->get_notices($limit);
  58
  59                 $this->init_rss();
  60                 $this->show_channel($notices);
  61                 $this->show_image();
  62
  63                 foreach ($notices as $n) {
  64                         $this->show_item($n);
  65                 }
  66
  67                 $this->end_rss();
  68         }
  69
  70         function show_channel($notices) {
  71
  72                 $channel = $this->get_channel();
  73                 $image = $this->get_image();
  74
  75                 common_element_start('channel', array('rdf:about' => $channel['url']));
  76                 common_element('title', NULL, $channel['title']);
  77                 common_element('link', NULL, $channel['link']);
  78                 common_element('description', NULL, $channel['description']);
  79
  80                 if ($image) {
  81                         common_element('image', array('rdf:resource' => $image));
  82                 }
  83
  84                 common_element_start('items');
  85                 common_element_start('rdf:Seq');
  86
  87                 foreach ($notices as $notice) {
  88                         common_element('rdf:li', array('rdf:resource' => $notice->uri));
  89                 }
  90
  91                 common_element_end('rdf:Seq');
  92                 common_element_end('items');
  93
  94                 common_element_end('channel');
  95         }
  96
  97         function show_image() {
  98                 $image = $this->get_image();
  99                 if ($image) {
 100                         $channel = $this->get_channel();
 101                         common_element_start('image', array('rdf:about' => $image));
 102                         common_element('title', NULL, $channel['title']);
 103                         common_element('link', NULL, $channel['link']);
 104                         common_element('url', NULL, $image);
 105                         common_element_end('image');
 106                 }
 107         }
 108
 109         function show_item($notice) {
 110                 $nurl = common_local_url('shownotice', array('notice' => $notice->id));
 111                 common_element_start('item', array('rdf:about' => $notice->uri));
 112                 common_element('title', NULL, $notice->created);
 113                 common_element('link', NULL, $nurl);
 114                 common_element('description', NULL, $notice->content);
 115                 common_element('dc:date', NULL, common_date_w3dtf($notice->created));
 116                 common_element_end('item');
 117         }
 118
 119         function init_rss() {
 120                 header('Content-Type: application/rdf+xml');
 121
 122                 common_start_xml();
 123                 common_element_start('rdf:RDF', array('xmlns:rdf' =>
 124                                                                                           'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
 125                                                                                           'xmlns:dc' =>
 126                                                                                           'http://purl.org/dc/elements/1.1/',
 127                                                                                           'xmlns' => 'http://purl.org/rss/1.0/'));
 128         }
 129
 130         function end_rss() {
 131                 common_element_end('rdf:RDF');
 132         }
 133 }