public/rss: implement JSON output format

classes/handler/public.php

@@ -2,7 +2,7 @@
 class Handler_Public extends Handler {
 
 	private function generate_syndicated_feed($owner_uid, $feed, $is_cat,
-		$limit, $search, $search_mode, $match_on, $view_mode = false) {
+		$limit, $search, $search_mode, $match_on, $view_mode = false, $format = 'atom') {
 
 		require_once "lib/MiniTemplator.class.php";
 
@@ -34,6 +34,7 @@ class Handler_Public extends Handler {
 
 		if (!$feed_site_url) $feed_site_url = get_self_url_prefix();
 
+		if ($format == 'atom') {
 			$tpl = new MiniTemplator;
 
 			$tpl->readTemplateFromFile("templates/generated_feed.txt");
@@ -101,7 +102,73 @@ class Handler_Public extends Handler {
 			$tpl->addBlock('feed');
 			$tpl->generateOutputToString($tmp);
 
+			header("Content-Type: text/xml; charset=utf-8");
+
 			print $tmp;
+		} else if ($format == 'json') {
+
+			$feed = array();
+
+			$feed['title'] = $feed_title;
+			$feed['version'] = VERSION;
+			$feed['feed_url'] = $feed_self_url;
+
+			if (PUBSUBHUBBUB_HUB && $feed == -2) {
+				$feed['hub_url'] = PUBSUBHUBBUB_HUB;
+			}
+
+			$feed['self_url'] = get_self_url_prefix();
+
+			$feed['articles'] = array();
+
+			while ($line = db_fetch_assoc($result)) {
+				$article = array();
+
+				$article['id'] = $line['link'];
+				$article['link']	= $line['link'];
+				$article['title'] = $line['title'];
+				$article['excerpt'] = truncate_string(strip_tags($line["content_preview"]), 100, '...');
+				$article['content'] = sanitize($this->link, $line["content_preview"], false, $owner_uid);
+				$article['updated'] = date('c', strtotime($line["updated"]));
+
+				if ($line['note']) $article['note'] = $line['note'];
+				if ($article['author']) $article['author'] = $line['author'];
+
+				$tags = get_article_tags($this->link, $line["id"], $owner_uid);
+
+				if (count($tags) > 0) {
+					$article['tags'] = array();
+
+					foreach ($tags as $tag) {
+						array_push($article['tags'], $tag);
+					}
+				}
+
+				$enclosures = get_article_enclosures($this->link, $line["id"]);
+
+				if (count($enclosures) > 0) {
+					$article['enclosures'] = array();
+
+					foreach ($enclosures as $e) {
+						$type = $e['content_type'];
+						$url = $e['content_url'];
+						$length = $e['duration'];
+
+						array_push($article['enclosures'], array("url" => $url, "type" => $type, "length" => $length));
+					}
+				}
+
+				array_push($feed['articles'], $article);
+			}
+
+			header("Content-Type: text/plain; charset=utf-8");
+
+			print json_encode($feed);
+
+		} else {
+			header("Content-Type: text/plain; charset=utf-8");
+			print json_encode(array("error" => array("message" => "Unknown format")));
+		}
 	}
 
 	function getUnread() {
@@ -267,8 +334,6 @@ class Handler_Public extends Handler {
 	}
 
 	function rss() {
-		header("Content-Type: text/xml; charset=utf-8");
-
 		$feed = db_escape_string($_REQUEST["id"]);
 		$key = db_escape_string($_REQUEST["key"]);
 		$is_cat = $_REQUEST["is_cat"] != false;
@@ -279,6 +344,10 @@ class Handler_Public extends Handler {
 		$search_mode = db_escape_string($_REQUEST["smode"]);
 		$view_mode = db_escape_string($_REQUEST["view-mode"]);
 
+		$format = db_escape_string($_REQUEST['format']);
+
+		if (!$format) $format = 'atom';
+
 		if (SINGLE_USER_MODE) {
 			authenticate_user($this->link, "admin", null);
 		}
@@ -295,7 +364,7 @@ class Handler_Public extends Handler {
 
 		if ($owner_id) {
 			$this->generate_syndicated_feed($owner_id, $feed, $is_cat, $limit,
-				$search, $search_mode, $match_on, $view_mode);
+				$search, $search_mode, $match_on, $view_mode, $format);
 		} else {
 			header('HTTP/1.1 403 Forbidden');
 		}