From 394fe15fe0b85bff1e5efa333582e6fb4b4e1af6 Mon Sep 17 00:00:00 2001
From: Ralf Becker <ralfbecker@outdoor-training.de>
Date: Fri, 22 Aug 2014 17:26:22 +0000
Subject: [PATCH] push backend using notifications table

---
 .../inc/class.notifications_push.inc.php      | 127 ++++++++++++++++++
 phpgwapi/inc/class.egw_json.inc.php           |   3 +
 2 files changed, 130 insertions(+)
 create mode 100644 notifications/inc/class.notifications_push.inc.php

diff --git a/notifications/inc/class.notifications_push.inc.php b/notifications/inc/class.notifications_push.inc.php
new file mode 100644
index 0000000000..8c49bbf5bc
--- /dev/null
+++ b/notifications/inc/class.notifications_push.inc.php
@@ -0,0 +1,127 @@
+<?php
+/**
+ * Notifications: push via notification polling
+ *
+ * @link http://www.egroupware.org
+ * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
+ * @package api
+ * @subpackage ajax
+ * @author Ralf Becker <rb@stylite.de>
+ * @version $Id$
+ */
+
+// egw_json_push_backend is currently not autoloaded, it would only try egw_json for it!
+require_once(EGW_API_INC.'/class.egw_json_push.inc.php');
+
+/**
+ * Class to push via notification polling and other json requests from client-side
+ */
+class notifications_push implements egw_json_push_backend
+{
+	const APP = 'notifications';
+
+	/**
+	 * Notification table in SQL database
+	 */
+	const TABLE = 'egw_notificationpopup';
+
+	/**
+	 * Notification type
+	 */
+	const TYPE = 'push';
+
+	/**
+	 * Reference to global DB object
+	 *
+	 * @var egw_db
+	 */
+	public static $db;
+
+	public static function get()
+	{
+		$already_send =& egw_cache::getSession(__CLASS__, 'already_send');
+		$max_id = egw_cache::getInstance(__CLASS__, 'max_id');
+
+		if (!isset($already_send))
+		{
+			self::cleanup_push_msgs();
+
+			if (!isset($max_id))
+			{
+				$max_id = (int)self::$db->select(self::TABLE, 'MAX(notify_id)', false, __LINE__, __FILE__, false, '', self::APP)->fetchColumn();
+				egw_cache::setInstance(__CLASS__, 'max_id', $max_id);
+			}
+			$already_send = $max_id;
+		}
+		elseif (isset($max_id) && $max_id > $already_send)
+		{
+			$response = egw_json_response::get();
+
+			foreach(self::$db->select(self::TABLE, '*', array(
+				'account_id' => array(0, $GLOBALS['egw_info']['user']['account_id']),
+				'notify_type' => self::TYPE,
+				'notify_id > '.(int)$already_send,
+			), __LINE__, __FILE__, false, 'ORDER BY notify_id ASC', self::APP) as $row)
+			{
+				$message = json_decode($row['notify_message'], true);
+				error_log(__METHOD__."() already_send=$already_send, message=".array2string($message));
+				if (is_array($message) && method_exists($response, $message['method']))
+				{
+					call_user_func_array(array($response, $message['method']), (array)$message['data']);
+				}
+				$already_send = $row['notify_id'];
+			}
+		}
+		error_log(__METHOD__."() max_id=$max_id, already_sent=$already_send");
+	}
+
+	/**
+	 * Adds any type of data to the message
+	 *
+	 * @param int $account_id account_id to push message too
+	 * @param string $key
+	 * @param mixed $data
+	 * @throws egw_json_push_exception_not_online if $account_id is not online
+	 */
+	public function addGeneric($account_id, $key, $data)
+	{
+		// todo: check $account_id is online
+		if ($account_id > 0 && !egw_session::notifications_active($account_id))
+		{
+			throw new egw_json_push_exception_not_online();
+		}
+		self::$db->insert(self::TABLE, array(
+			'account_id'  => $account_id,
+			'notify_type' => self::TYPE,
+			'notify_message' => json_encode(array(
+				'method' => $key,
+				'data' => $data,
+			)),
+		), false, __LINE__, __FILE__, self::APP);
+
+		// cache highest id, to not poll database
+		egw_cache::setInstance(__CLASS__, 'max_id', self::$db->get_last_insert_id(self::TABLE, 'notify_id'));
+
+		self::cleanup_push_msgs();
+	}
+
+	/**
+	 * Delete push messges older then our heartbeat-limit (poll frequency of notifications)
+	 */
+	protected static function cleanup_push_msgs()
+	{
+		self::$db->delete(self::TABLE, array(
+			'notify_type' => self::TYPE,
+			'notify_created < '.self::$db->from_unixtime(egw_session::heartbeat_limit()),
+		), __LINE__, __FILE__, self::APP);
+	}
+
+	/**
+	 * Init our static variables eg. database object
+	 */
+	public static function init_static()
+	{
+		self::$db =& $GLOBALS['egw']->db;
+	}
+}
+notifications_push::init_static();
diff --git a/phpgwapi/inc/class.egw_json.inc.php b/phpgwapi/inc/class.egw_json.inc.php
index d4bf3ff906..c50fa2ed4a 100644
--- a/phpgwapi/inc/class.egw_json.inc.php
+++ b/phpgwapi/inc/class.egw_json.inc.php
@@ -161,6 +161,9 @@ class egw_json_request
 		$parameters = translation::convert($parameters, 'utf-8');
 
 		call_user_func_array(array($ajaxClass, $functionName), $parameters);
+
+		// check if we have push notifications, if notifications app available
+		if (class_exists('notifications_push')) notifications_push::get();
 	}
 }