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Diffstat (limited to 'engine')
| -rw-r--r-- | engine/lib/notification.php | 115 |
1 files changed, 115 insertions, 0 deletions
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); + } +?>
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