gnufm/nixtape/rdf.php

<?php

/* GNU FM -- a free network service for sharing your music listening habits

   Copyright (C) 2009 Free Software Foundation, Inc

   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/>.

*/

require_once('config.php');
require_once('utils/arc/ARC2.php');

$page = $_GET['page'];
$fmt  = $_GET['fmt'];

if (empty($fmt)) {
	$fmt = 'xml';
}
if (empty($page)) {
	die('Required parameter \'page\' not provided.');
}

$parser = ARC2::getSemHTMLParser(array('sem_html_formats' => 'rdfa'));
$parser->parse($base_url . $page);
$index = $parser->getSimpleIndex(0);

$conf = array(
	'ns' => array(
		'xhv'  => 'http://www.w3.org/1999/xhtml/vocab#',
		'dc'   => 'http://purl.org/dc/terms/',
		'foaf' => 'http://xmlns.com/foaf/0.1/',
		'bio'  => 'http://purl.org/vocab/bio/0.1/',
		'sioc' => 'http://rdfs.org/sioc/ns#',
		'rdfs' => 'http://www.w3.org/2000/01/rdf-schema#',
		'gob'  => 'http://purl.org/ontology/last-fm/',
		'mo'   => 'http://purl.org/ontology/mo/',
		'rss'  => 'http://purl.org/rss/1.0/'
		)
	);

switch ($fmt) {
	case 'xml' :
		header('Content-Type: application/rdf+xml');
		$ser = ARC2::getRDFXMLSerializer($conf);
		break;
	case 'ttl' :
		header('Content-Type: application/x-turtle');
		$ser = ARC2::getTurtleSerializer($conf);
		break;
	case 'rss' :
		header('Content-Type: application/rss+xml');
		$ser = ARC2::getRSS10Serializer($conf);
		break;
	case 'json' :
		if ($_GET['callback']) {
			header('Content-Type: text/javascript');
		} else {
			header('Content-Type: application/json');
		}
		$ser = ARC2::getRDFJSONSerializer($conf);
		break;
	case 'nt' :
		header('Content-Type: text/plain');
		$ser = ARC2::getNTriplesSerializer($conf);
		break;
}

if (isset($_GET['callback'])) {
	print $_GET['callback'] . '(';
}
print $ser->getSerializedIndex($index);
if ($_GET['callback']) {
	print ');';
}