From b0baac5c37d54b684dbee078df6c87173669f458 Mon Sep 17 00:00:00 2001
From: icewing <icewing@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Mon, 28 Apr 2008 16:43:35 +0000
Subject: Marcus Povey <marcus@dushka.co.uk> * Notify and email notify added
 (not tested) ... still unsure about get_notify_list, attempted a number of
 options ... not sure if this is as simple as it could be

git-svn-id: https://code.elgg.org/elgg/trunk@547 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 engine/lib/notification.php | 115 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 engine/lib/notification.php

diff --git a/engine/lib/notification.php b/engine/lib/notification.php
new file mode 100644
index 000000000..0b49e9108
--- /dev/null
+++ b/engine/lib/notification.php
@@ -0,0 +1,115 @@
+<?php
+	/**
+	 * Notifications
+	 * This file contains classes and functions which allow plugins to register and send notifications.
+	 * 
+	 * @package Elgg
+	 * @subpackage API
+	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
+	 * @author Marcus Povey
+	 * @copyright Curverider Ltd 2008
+	 * @link http://elgg.org/
+	 */
+
+	/** Notification handlers */
+	$NOTIFICATION_HANDLERS = array();
+	
+	/**
+	 * This function registers a handler for a given notification type (eg "email")
+	 *
+	 * @param string $method The method
+	 * @param string $handler The handler function, in the format "handler($to_guid, $message, array $params = NULL)"
+	 */
+	function register_notification_handler($method, $handler)
+	{
+		global $NOTIFICATION_HANDLERS;
+		
+		if (is_callable($handler)) 
+		{
+			$NOTIFICATION_HANDLERS[$method] = $handler;
+			
+			return true;
+		}
+		
+		return false;
+	}
+	
+	/**
+	 * Send a notification message using a pre-registered method.
+	 *
+	 * @param string $method The method used 
+	 * @param mixed $to Either a guid or an array of guid's to notify
+	 * @param string $message A message
+	 * @param array $params Optional method specific parameters as an associative array, for example "subject", "from"
+	 * @return boolean
+	 * @throws NotificationException
+	 */
+	function notify($method, $to, $message, array $params = NULL)
+	{
+		global $NOTIFICATION_HANDLERS;
+		
+		// Sanitise
+		if (!is_array($to))
+			$to = (int)$to;
+			
+		if ($method=="")
+			throw new NotificationException("No notification method specified.");
+			
+		if ((!array_key_exists($method, $NOTIFICATION_HANDLERS)) || (!is_callable($NOTIFICATION_HANDLERS[$method])))
+			throw new NotificationExceptions("No handler found for '$method' or it was not callable.");
+			
+		if (!is_array($to))
+			$to = array($to);
+			
+		foreach ($to as $guid)	
+				if (!$NOTIFICATION_HANDLERS[$method]($guid, sanitise_string($method), $params))
+					throw new NotificationException("There was an error while notifying $guid");
+			
+		return true;
+	}
+	
+	/**
+	 * Trigger the event "request_notify_list" with a given array of context values.
+	 * 
+	 * Listening functions should examine the array and determine whether - for a given context - users need to be 
+	 */
+	function get_notify_list(array $context)
+	{
+		$list = array();
+		
+		// Trigger an event to retrieve a list of guids to notify for a given context.
+		return trigger_plugin_hook("request_notify_list", "all", $context, $list);
+	}
+	
+	
+	/**
+	 * Notification exception.
+	 * @author Marcus Povey
+	 */
+	class NotificationException extends Exception {}
+
+
+	/**
+	 * Send a notification via email.
+	 * 
+	 * Parameters accept "from" and "subject" as values.
+	 */
+	function email_notify_handler($to_guid, $message, array $params = NULL)
+	{
+		$to_guid = (int)$to_guid;
+		
+		$entity = get_entity($to_guid);
+		
+		if ((!($entity instanceof ElggUser)) || ($entity->email==""))
+			throw new NotificationException("Could not get the email address for GUID:$to_guid");
+		
+		
+		$to = $entity->email;
+		$subject = $params['subject'];
+		$from = $params['from'];
+		
+		$headers = "From: $from\r\n";
+				
+		return mail($to, $subject, $message, $headers);
+	}
+?>
\ No newline at end of file
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