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$iIBlockID = 8;
$iUserID = 1238;

$arDocumentStates = CBPDocument::GetDocumentStates(
                array('iblock', 'CIBlockDocument', 'iblock_' . $iIBlockId),
                array('iblock', 'CIBlockDocument', $ID)
            );

$arGroups = \CUser::GetUserGroup($iUserID);
arOpertions = CBPDocument::GetAllowableOperations($iUserID, $arGroups, $arDocumentStates, true);
var_dump($arOpertions);

array(2) {
  [0]=>
  string(4) "read"
  [1]=>
  string(5) "write"
}