public static function validateRelation($reltypeid, $subjectguid, $targetguid, $userid = null, $parentid = null, $reverse = false)
{
if ($reverse === true) {
$tmp = $subjectguid;
$subjectguid = $targetguid;
$targetguid = $tmp;
}
$relationtype = EntityRelations::getRelationTypeByID($reltypeid);
if ($relationtype === null) {
return "No relation type found";
}
$subtype = EntityTypes::getTypeByGuid($subjectguid);
$tartype = EntityTypes::getTypeByGuid($targetguid);
if ($subtype !== $relationtype->subjectType || $tartype !== $relationtype->targetType) {
return "Invalid relation identifiers";
}
$subobj = EntityTypes::getEntity($subtype, $subjectguid);
if ($subobj === null) {
return "Subject " . $subtype . " not found";
}
$tarobj = EntityTypes::getEntity($tartype, $targetguid);
if ($tarobj === null) {
return "Target " . $tartype . " not found";
}
$user = null;
if (is_numeric($userid) && $userid > 0 || !is_numeric($userid) && trim($userid) !== "") {
$user = EntityTypes::getPerson($userid);
if ($user === null) {
return "User not found";
}
$obj = $subobj;
if ($reverse === true) {
$obj = $tarobj;
}
$res = self::canRelateSubject($relationtype, $user, $obj);
if ($res === false) {
return "No user permissions to relate " . $relationtype->subjectType . " with " . $relationtype->targetType;
}
}
if ($parentid !== null && EntityRelations::getRelationByID($parentid) === null) {
return "Parent relation not found";
}
return true;
}
