--- /dev/null
+<?php
+
+/**
+ * Utilities to import and export bookmarks using the Netscape format
+ */
+class NetscapeBookmarkUtils
+{
+
+ /**
+ * Filters links and adds Netscape-formatted fields
+ *
+ * Added fields:
+ * - timestamp link addition date, using the Unix epoch format
+ * - taglist comma-separated tag list
+ *
+ * @param LinkDB $linkDb The link datastore
+ * @param string $selection Which links to export: (all|private|public)
+ *
+ * @throws Exception Invalid export selection
+ *
+ * @return array The links to be exported, with additional fields
+ */
+ public static function filterAndFormat($linkDb, $selection)
+ {
+ // see tpl/export.html for possible values
+ if (! in_array($selection, array('all','public','private'))) {
+ throw new Exception('Invalid export selection: "'.$selection.'"');
+ }
+
+ $bookmarkLinks = array();
+
+ foreach ($linkDb as $link) {
+ if ($link['private'] != 0 && $selection == 'public') {
+ continue;
+ }
+ if ($link['private'] == 0 && $selection == 'private') {
+ continue;
+ }
+ $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
+ $link['timestamp'] = $date->getTimestamp();
+ $link['taglist'] = str_replace(' ', ',', $link['tags']);
+ $bookmarkLinks[] = $link;
+ }
+
+ return $bookmarkLinks;
+ }
+}