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<?php
/**
* Elgg actions
* Allows system modules to specify actions
*
* @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
* @link http://elgg.org/
*/
// Action setting and run *************************************************
/**
* Loads an action script, if it exists, then forwards elsewhere
*
* @param string $action The requested action
* @param string $forwarder Optionally, the location to forward to
*/
function action($action, $forwarder = "") {
global $CONFIG;
$query = parse_url($_SERVER['REQUEST_URI']);
if (isset($query['query'])) {
$query = $query['query'];
$query = rawurldecode($query);
$query = explode('&',$query);
if (sizeof($query) > 0) {
foreach($query as $queryelement) {
$vals = explode('=',$queryelement);
if (sizeof($vals) > 1) {
set_input(trim($vals[0]),trim($vals[1]));
}
}
}
}
$forwarder = str_replace($CONFIG->url, "", $forwarder);
$forwarder = str_replace("http://", "", $forwarder);
$forwarder = str_replace("@", "", $forwarder);
if (substr($forwarder,0,1) == "/") {
$forwarder = substr($forwarder,1);
}
if (isset($CONFIG->actions[$action])) {
if (
(isadminloggedin()) ||
(!$CONFIG->actions[$action]['admin'])
) {
if ($CONFIG->actions[$action]['public'] || $_SESSION['id'] != -1) {
// Trigger action event TODO: This is only called before the primary action is called. We need to rethink actions for 1.5
trigger_elgg_event('action', $action);
// Include action
if (@include($CONFIG->actions[$action]['file'])) {
} else {
register_error(sprintf(elgg_echo('actionundefined'),$action));
}
} else {
register_error(elgg_echo('actionloggedout'));
}
}
} else {
register_error(sprintf(elgg_echo('actionundefined'),$action));
}
forward($CONFIG->url . $forwarder);
}
/**
* Registers a particular action in memory
*
* @param string $action The name of the action (eg "register", "account/settings/save")
* @param boolean $public Can this action be accessed by people not logged into the system?
* @param string $filename Optionally, the filename where this action is located
* @param boolean $admin_only Whether this action is only available to admin users.
*/
function register_action($action, $public = false, $filename = "", $admin_only = false) {
global $CONFIG;
if (!isset($CONFIG->actions)) {
$CONFIG->actions = array();
}
if (empty($filename)) {
$path = "";
if (isset($CONFIG->path)) $path = $CONFIG->path;
$filename = $path . "actions/" . $action . ".php";
}
$CONFIG->actions[$action] = array('file' => $filename, 'public' => $public, 'admin' => $admin_only);
return true;
}
/**
* Actions to perform on initialisation
*
* @param string $event Events API required parameters
* @param string $object_type Events API required parameters
* @param string $object Events API required parameters
*/
function actions_init($event, $object_type, $object) {
register_action("error");
return true;
}
/**
* Action gatekeeper.
* This function verifies form input for security features (like a generated token), and forwards
* the page if they are invalid.
*
* Place at the head of actions.
*/
function action_gatekeeper()
{
$token = get_input('__elgg_token');
$ts = get_input('__elgg_ts');
$session_id = session_id();
if (($token) && ($ts) && ($session_id))
{
// generate token, check with input and forward if invalid
$generated_token = generate_action_token($ts);
// Validate token
if (strcmp($token, $generated_token)==0)
{
$hour = 60*60;
$now = time();
// Validate time to ensure its not crazy
if (($ts>$now-$hour) && ($ts<$now+$hour))
{
$returnval = true; // We have already got this far, so unless anything else says something to the contry we assume we're ok
$returnval = trigger_plugin_hook('action_gatekeeper:permissions:check', 'all', array(
'token' => $token,
'time' => $ts
), $returnval);
if ($returnval)
return true;
else
register_error(elgg_echo('actiongatekeeper:pluginprevents'));
}
else
register_error(elgg_echo('actiongatekeeper:timeerror'));
}
else
register_error(elgg_echo('actiongatekeeper:tokeninvalid'));
}
else
register_error(elgg_echo('actiongatekeeper:missingfields'));
forward();
exit;
}
/**
* Generate a token for the current user suitable for being placed in a hidden field in action forms.
*
* @param int $timestamp Unix timestamp
*/
function generate_action_token($timestamp)
{
// Get input values
$site_secret = get_site_secret();
// Current session id
$session_id = session_id();
// Get user agent
$ua = $_SERVER['HTTP_USER_AGENT'];
// Session token
$st = $_SESSION['__elgg_session'];
if (($site_secret) && ($session_id))
return md5($site_secret.$timestamp.$session_id.$ua.$st);
return false;
}
/**
* Initialise the site secret.
*
*/
function init_site_secret()
{
$secret = md5(rand().microtime());
if (datalist_set('__site_secret__', $secret))
return $secret;
return false;
}
/**
* Retrieve the site secret.
*
*/
function get_site_secret()
{
$secret = datalist_get('__site_secret__');
if (!$secret) $secret = init_site_secret();
return $secret;
}
// Register some actions ***************************************************
register_elgg_event_handler("init","system","actions_init");
?>
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