abstract out RSS 1.0 generation to allow multiple streams

darcs-hash:20080522112954-84dde-aa5087977298f5169148383e82e22241e613b1f2.gz

1 files changed, 133 insertions, 0 deletions

diff --git a/lib/rssaction.php b/lib/rssaction.php
new file mode 100644
index 000000000..9d4066ee5
--- /dev/null
+++ b/lib/rssaction.php
@@ -0,0 +1,133 @@
+<?php
+/*
+ * Laconica - a distributed open-source microblogging tool
+ * Copyright (C) 2008, Controlez-Vous, 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/>.
+ */
+
+if (!defined('LACONICA')) { exit(1); }
+
+class Rss10Action extends Action {
+
+	function handle($args) {
+		parent::handle($args);
+		
+		$limit = (int) $this->trimmed('limit');
+		
+		$this->show_rss($limit);
+	}
+
+	function init() {
+		return true;
+	}
+	
+	function get_notices() {
+		return array();
+	}
+
+	function get_channel() {
+		return array('url' => '',
+					 'title' => '',
+					 'link' => '',
+					 'description' => '');
+	}
+	
+	function get_image() {
+		return NULL;
+	}
+	
+	function show_rss($limit=0) {
+		
+		if (!$this->init()) {
+			return;
+		}
+		
+		$notices = $this->get_notices($limit);
+		
+		$this->init_rss();
+		$this->show_channel($notices);
+		$this->show_image();
+		
+		foreach ($notices as $n) {
+			$this->show_item($n);
+		}
+		
+		$this->end_rss();
+	}
+
+	function show_channel($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, $channel['description']);
+
+		if ($image) {
+			common_element('image', array('rdf:resource' => $image));
+		}
+
+		common_element_start('items');
+		common_element_start('rdf:Seq');
+		foreach ($notices as $n) {
+			common_element('rdf:li', array('rdf:resource' =>
+										   common_local_url('shownotice',
+															array('notice' => $n->id))));
+		}
+		
+		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) {
+		$nurl = common_local_url('shownotice', array('notice' => $notice->id));
+		common_element_start('item', array('rdf:about' => $nurl));
+		common_element('title', NULL, $notice->created);
+		common_element('link', NULL, $nurl);
+		common_element('description', NULL, common_render_content($notice->content));
+		common_element('dc:date', NULL, common_date_w3dtf($notice->created));
+		common_element_end('item');
+	}
+	
+	function init_rss() {
+		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' => 'http://purl.org/rss/1.0/'));
+	}
+	
+	function end_rss() {		
+		common_element_end('rdf:RDF');
+	}
+}
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