_mod_forum_)
$classname = substr($classname,1, strlen($classname) - 1); //remove first _ (e.g. _mod_forum => mod_forum)
$coreclassname = $classname."api";
$classname .= 'ws_api';
///these three next lines can be generic => create a function
require_once($CFG->dirroot.$apipath.'wsapi.php');
$api = new $classname();
$description = $api->get_function_webservice_description($functionname); //retrieve the web service description for this function
///This following line is only REST protocol
$params = retrieve_params ($description); //retrieve the REST params
///Generic part to any protocols
if ($params === false) {
//return an error message, the REST params doesn't match with the web service description
}
require_once($CFG->dirroot.$apipath.'api.php');
$res = call_user_func_array ( $coreclassname.'::'.$functionname, $params);
///Transform result into xml in order to send the REST response
$return = mdl_conn_rest_object_to_xml ($res,$description['return'][0]);
return "$return";
}
/**
*
* @author Jerome Mouneyrac
* @param $description
* @return
*/
function retrieve_params ($description) {
$params = $description['paramorder'];
//retrieve REST param matching the description
foreach ($description['wsparams'] as $paramname => $paramtype) {
$value = optional_param($paramname,null,$paramtype);
if (!empty($value)) {
$fullstopposition = strrpos($paramname,":");
//case: param is an object/array
if (!empty($fullstopposition)) {
$params[substr($paramname,0,$fullstopposition)][substr($paramname,$fullstopposition+1, strlen($paramname) - $fullstopposition)] = $value;
} else {
$params[$paramname] = $value;
}
}
}
return $params;
}
/**
* auxiliar function for simplexml_object_to_xml
* @author Ferran Recio, David Castro Garcia
* @param $obj
* @param $tag
* @param $atts assoc array (key => value)
* @return string
*/
function mdl_conn_rest_object_to_xml ($obj, $tag,$atts=false) {
$res = '';
$tag_atts = '';
if ($atts) {
$main_atts = array();
foreach ($atts as $att=>$val) {
$main_atts[] = "$att=\"".urlencode($val)."\"";
}
if (count($main_atts)) $tag_atts = ' '.implode(' ',$main_atts);
}
//if is an object
if (is_object($obj)) {
$parts = get_object_vars($obj);
foreach ($parts as $tag2 => $val) {
$res.= mdl_conn_rest_object_to_xml ($val, $tag2);
}
return "<$tag$tag_atts>\n$res\n";
}
//if it's an array all elements will be inside te same tag but with a new atribute key
if (is_array($obj)){
if (!$atts) $atts = array();
//we came from another array
if (isset($atts['keys'])) $atts = array();
foreach ($obj as $key=>$val) {
$array_atts = $atts;
$array_atts['key'] = $key;
$res.= mdl_conn_rest_object_to_xml ($val, $tag,$array_atts);
}
return $res;
}
//any other type, just encapsule it
$obj = htmlentities($obj);
return "<$tag$tag_atts>$obj\n";
}
?>