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<?php
/**
* Elgg river.
* Functions for listening for and generating the river out of the system log.
*
* @package Elgg
* @subpackage Core
* @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/
*/
/**
* Extract a list of river events from the current system log.
* This function retrieves the objects from the system log and will attempt to render
* the view "river/CLASSNAME/EVENT" where CLASSNAME is the class of the object the system event is referring to,
* and EVENT is the event (create, update, delete etc).
*
* This view will be passed the log entry (as 'log_entry') and the object (as 'object') which will be accessable
* through the $vars[] array.
*
* It returns an array of the result of each of these views.
*
* \TODO: Limit to just one user or just one user's friends
* \TODO: Make this more efficient / reduce DB queries.
*
* @param int $by_user The user who initiated the event.
* @param string $relationship Limit return results to only those users who $by_user has $relationship with.
* @param int $limit Maximum number of events to show
* @param int $offset An offset
* @return array of river entities rendered with the appropriate view.
*/
function get_river_entries($by_user = "", $relationship = "", $limit = 10, $offset = 0)
{
// set start limit and offset
$cnt = $limit; // Didn' cast to int here deliberately
$off = $offset; // here too
if (is_array($by_user) && sizeof($by_user) > 0) {
foreach($by_user as $key => $val) {
$by_user[$key] = (int) $val;
}
} else {
$by_user = (int)$by_user;
}
$exit = false;
// River objects
$river = array();
do
{
$log_events = get_system_log($by_user, "","", $cnt, $off);
if (!$log_events)
$exit = true;
else
{
foreach ($log_events as $log)
{
// See if we have access to the object we're talking about
$event = $log->event;
$class = $log->object_class;
$tmp = new $class();
$object = $tmp->getObjectFromID($log->object_id);
// Exists and we have access to it
// if (is_a($object, $class))
if ($object instanceof $class)
{
// If no relationship defined or it matches $relationship
if (
(!$relationship) ||
(
($relationship) &&
(check_entity_relationship($by_user, $relationship, $tmp->getObjectOwnerGUID()))
)
)
{
// See if anything can handle it
$tam = "";
// test if view exist and if so
//if (isset($by_user_obj) && $by_user_obj instanceof ElggUser) {
//} else {
$by_user_obj = get_entity($log->performed_by_guid);
//}
if ($object instanceof ElggEntity) {
$subtype = $object->getSubtype();
} else {
$subtype = "";
}
if ($subtype == "widget") {
$subtype = "widget/" . $object->handler;
}
if (!empty($subtype) && elgg_view_exists("river/{$subtype}/{$event}")) {
$tam = elgg_view("river/{$subtype}/$event", array(
'performed_by' => $by_user_obj,
'log_entry' => $log,
'entity' => $object
));
} else {
$tam = elgg_view("river/$class/$event", array(
'performed_by' => $by_user_obj,
'log_entry' => $log,
'entity' => $object
));
}
if (!empty($tam)) {
$tam = elgg_view("river/wrapper",array(
'entry' => $tam,
'log' => $log,
'entity' => $object));
}
if ($tam)
{
$river[] = $tam;
$cnt--;
}
}
}
// Increase offset
$off++;
}
}
} while (
($cnt > 0) &&
(!$exit)
);
return $river;
}
/**
* Extract entities from the system log and produce them as an OpenDD stream.
* This stream can be subscribed to and reconstructed on another system as an activity stream.
*
* @param int $by_user The user who initiated the event.
* @param string $relationship Limit return results to only those users who $by_user has $relationship with.
* @param int $limit Maximum number of events to show
* @param int $offset An offset
* @return ODDDocument
*/
function get_river_entries_as_opendd($by_user = "", $relationship = "", $limit = 10, $offset = 0)
{
// set start limit and offset
$cnt = $limit; // Didn' cast to int here deliberately
$off = $offset; // here too
if (is_array($by_user) && sizeof($by_user) > 0) {
foreach($by_user as $key => $val) {
$by_user[$key] = (int) $val;
}
} else {
$by_user = (int)$by_user;
}
$exit = false;
// River objects
$river = new ODDDocument();
do
{
$log_events = get_system_log($by_user, "","", $cnt, $off);
if (!$log_events)
$exit = true;
else
{
foreach ($log_events as $log)
{
// See if we have access to the object we're talking about
$event = $log->event;
$class = $log->object_class;
$tmp = new $class();
$object = $tmp->getObjectFromID($log->object_id);
// Exists and we have access to it
// if (is_a($object, $class))
if ($object instanceof $class)
{
// If no relationship defined or it matches $relationship
if (
(!$relationship) ||
(
($relationship) &&
(check_entity_relationship($by_user, $relationship, $tmp->getObjectOwnerGUID()))
)
)
{
$relationship_obj = NULL;
// Handle updates of entities
if ($object instanceof ElggEntity)
{
$relationship_obj = new ODDRelationship(
guid_to_uuid($log->performed_by_guid),
$log->event,
guid_to_uuid($log->object_id)
);
}
// Handle updates of metadata
if ($object instanceof ElggExtender)
{
$odd = $object->export();
$relationship_obj = new ODDRelationship(
guid_to_uuid($log->performed_by_guid),
$log->event,
$odd->getAttribute('uuid')
);
}
// Handle updates of relationships
if ($object instanceof ElggRelationship)
{
$relationship_obj = $object->export(); // I figure this is what you're actually interested in in this instance.
}
// If we have handled it then add it to the document
if ($relationship_obj) {
$relationship_obj->setPublished($log->time_created);
$river->addElement($relationship_obj);
}
}
}
// Increase offset
$off++;
}
}
} while (
($cnt > 0) &&
(!$exit)
);
return $river;
}
/**
* Extract a list of river events from the current system log, from a given user's friends.
*
* @seeget_river_entries
* @param int $by_user The user whose friends we're checking for.
* @param int $limit Maximum number of events to show
* @param int $offset An offset
* @return array of river entities rendered with the appropriate view.
*/
function get_river_entries_friends($by_user, $limit = 10, $offset = 0) {
if ($friends = get_user_friends($by_user)) {
$friendsarray = array();
foreach($friends as $friend) {
$friendsarray[] = $friend->getGUID();
}
}
return get_river_entries($friendsarray,"",$limit,$offset);
}
/**
* Simplify drawing a river for a given user.
*
* @param int $guid The user
* @param unknown_type $limit Limit
* @param unknown_type $offset Offset
* @param string $view Optional view to use to display the river (dashboard is assumed)
*/
function elgg_view_river($guid, $limit = 10, $offset = 0, $view = 'river/dashboard')
{
return elgg_view($view, array('river' => get_river_entries($guid,"", $limit, $offset)));
}
/**
* Simplify drawing a river for a given user, showing their friend's activity
*
* @param int $guid The user
* @param unknown_type $limit Limit
* @param unknown_type $offset Offset
* @param string $view Optional view to use to display the river (dashboard is assumed)
*/
function elgg_view_friend_river($guid, $limit = 10, $offset = 0, $view = 'river/dashboard')
{
return elgg_view($view, array('river' => get_river_entries_friends($guid, $limit, $offset)));
}
?>
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