add jabber library and use it

darcs-hash:20080624001523-34904-8d0c052f12301d86aeb9107149b34f22c94da1c4.gz

lib/jabber.php

@@ -0,0 +1,33 @@
+<?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); }
+
+function jabber_valid_base_jid($jid) {
+	# Cheap but effective
+	return Validate::email($jid);
+}
+
+function jabber_normalize_jid($jid) {
+		preg_match("/(?:([^\@]+)\@)?([^\/]+)(?:\/(.*))?$/", $jid, $matches);
+		$node = $matches[1];
+		$server = $matches[2];
+		$resource = $matches[3];
+		return strtolower($node.'@'.$server);
+}