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<?php
/**
* Elgg river 2.0.
* Functions for listening for and generating the river separately from 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 Curverider Ltd
* @copyright Curverider Ltd 2008-2009
* @link http://elgg.org/
*/
/**
* Adds an item to the river.
*
* @param string $view The view that will handle the river item (must exist)
* @param string $action_type An arbitrary one-word string to define the action (eg 'comment', 'create')
* @param int $subject_guid The GUID of the entity doing the action
* @param int $object_guid The GUID of the entity being acted upon
* @param int $access_id The access ID of the river item (default: same as the object)
* @param int $posted The UNIX epoch timestamp of the river item (default: now)
* @return true|false Depending on success
*/
function add_to_river(
$view,
$action_type,
$subject_guid,
$object_guid,
$access_id = -1,
$posted = 0
) {
// Sanitise variables
if (!elgg_view_exists($view)) return false;
if (!($subject = get_entity($subject_guid))) return false;
if (!($object = get_entity($object_guid))) return false;
if (empty($action_type)) return false;
if ($posted == 0) $posted = time();
if ($access_id == -1) $access_id = $object->access_id;
$type = $object->getType();
$subtype = $object->getSubtype();
$action_type = sanitise_string($action_type);
// Load config
global $CONFIG;
// Attempt to save river item; return success status
return insert_data("insert into {$CONFIG->dbprefix}river " .
" set type = '{$type}', " .
" subtype = '{$subtype}', " .
" action_type = '{$action_type}', " .
" access_id = {$access_id}, " .
" view = '{$view}', " .
" subject_guid = {$subject_guid}, " .
" object_guid = {$object_guid}, " .
" posted = {$posted} ");
}
/**
* Removes all items relating to a particular acting entity from the river
*
* @param int $subject_guid The GUID of the entity
* @return true|false Depending on success
*/
function remove_from_river_by_subject(
$subject_guid
) {
// Sanitise
$subject_guid = (int) $subject_guid;
// Load config
global $CONFIG;
// Remove
return delete_data("delete from {$CONFIG->dbprefix}river where subject_guid = {$subject_guid}");
}
/**
* Removes all items relating to a particular entity being acted upon from the river
*
* @param int $object_guid The GUID of the entity
* @return true|false Depending on success
*/
function remove_from_river_by_object(
$object_guid
) {
// Sanitise
$object_guid = (int) $object_guid;
// Load config
global $CONFIG;
// Remove
return delete_data("delete from {$CONFIG->dbprefix}river where object_guid = {$object_guid}");
}
/**
* Retrieves items from the river. All parameters are optional.
*
* @param int|array $subject_guid Acting entity to restrict to. Default: all
* @param int|array $object_guid Entity being acted on to restrict to. Default: all
* @param string $subject_relationship If set to a relationship type, this will use $subject_guid as the starting point and set the subjects to be all users this entity has this relationship with (eg 'friend'). Default: blank
* @param string $type The type of entity to restrict to. Default: all
* @param string $subtype The subtype of entity to restrict to. Default: all
* @param string $action_type The type of river action to restrict to. Default: all
* @param int $limit The number of items to retrieve. Default: 20
* @param int $offset The page offset. Default: 0
* @param int $posted_min The minimum time period to look at. Default: none
* @param int $posted_max The maximum time period to look at. Default: none
* @return array|false Depending on success
*/
function get_river_items(
$subject_guid = 0,
$object_guid = 0,
$subject_relationship = '',
$type = '',
$subtype = '',
$action_type = '',
$limit = 20,
$offset = 0,
$posted_min = 0,
$posted_max = 0
) {
// Sanitise variables
if (!is_array($subject_guid)) {
$subject_guid = (int) $subject_guid;
} else {
foreach($subject_guid as $key => $temp) {
$subject_guid[$key] = (int) $temp;
}
}
if (!is_array($object_guid)) {
$object_guid = (int) $object_guid;
} else {
foreach($object_guid as $key => $temp) {
$object_guid[$key] = (int) $temp;
}
}
if (!empty($type)) $action_type = sanitise_string($type);
if (!empty($subtype)) $action_type = sanitise_string($subtype);
if (!empty($action_type)) $action_type = sanitise_string($action_type);
$limit = (int) $limit;
$offset = (int) $offset;
$posted_min = (int) $posted_min;
$posted_max = (int) $posted_max;
// Construct 'where' clauses for the river
$where = array();
$where[] = get_access_sql_suffix();
if (empty($subject_relationship)) {
if (!empty($subject_guid))
if (!is_array($subject_guid)) {
$where[] = " subject_guid = {$subject_guid} ";
} else {
$where[] = " subject_guid in (" . implode(',',$subject_guid) . ") ";
}
} else {
if (!is_array($subject_guid))
if ($entities = get_entities_from_relationship($subject_relationship,$subject_guid,false,'','',0,'',9999)) {
$guids = array();
foreach($entities as $entity) $guids[] = (int) $entity->guid;
$guids[] = $subject_guid;
$where[] = " subject_guid in (" . implode(',',$guids) . ") ";
}
}
if (!empty($object_guid))
if (!is_array($object_guid)) {
$where[] = " object_guid = {$object_guid} ";
} else {
$where[] = " object_guid in (" . implode(',',$object_guid) . ") ";
}
if (!empty($type)) $where[] = " type = '{$type}' ";
if (!empty($subtype)) $where[] = " subtype = '{$subtype}' ";
if (!empty($action_type)) $where[] = " action_type = '{$action_type}' ";
if (!empty($posted_min)) $where[] = " posted > {$posted_min} ";
if (!empty($posted_max)) $where[] = " posted < {$posted_max} ";
$whereclause = implode(' and ', $where);
// Construct main SQL
$sql = "select id,type,subtype,action_type,access_id,view,subject_guid,object_guid,posted from {$CONFIG->dbprefix}river where {$whereclause} limit {$offset},{$limit}";
// Get data
return get_data($sql);
}
/**
* Returns a human-readable representation of a river item
*
* @see get_river_items
*
* @param stdClass $item A river item object as returned from get_river_items
* @return string|false Depending on success
*/
function elgg_view_river_item($item) {
if (isset($item->view)) {
if (elgg_view_exists($item->view)) {
$body = elgg_view($item->view,array(
'item' => $item
));
}
return elgg_view('river/item/wrapper',array(
'item' => $item,
'body' => $body
));
}
return false;
}
function elgg_view_river_items($subject_guid = 0,
$object_guid = 0,
$subject_relationship = '',
$type = '',
$subtype = '',
$action_type = '',
$limit = 20,
$posted_min = 0,
$posted_max = 0) {
// Get input from outside world and sanitise it
$offset = (int) get_input('offset',0);
// Get river items, if they exist
if ($riveritems = get_river_items($subject_guid,$object_guid,$subject_relationship,$type,$subtype,$action_type,$limit,$offset,$posted_min,$posted_max)) {
return elgg_view('river/item/list',array(
'limit' => $limit,
'offset' => $offset,
'items' => $riveritems,
));
}
return '';
}
?>
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