public function process_livesearch()
{
$controlOrigin = Config::getConfig('accessControlAllowOrigin');
header("Access-Control-Allow-Origin: {$controlOrigin}");
header('Access-Control-Allow-Methods: *');
header('Content-Type: application/json');
$errors = Handler::validateInput($_POST);
if (!empty($errors)) {
// Required inputs are not provided
$this->handler->formResponse('failed', 'Error: Required or invalid inputs: ' . implode(',', $errors));
}
// 2. A layer of security against those Bots that submit a form quickly
if (!$this->handler->verifyBotSearched($_POST['ls_page_loaded_at'])) {
// Searching is started sooner than the search start time offset
$this->handler->formResponse('failed', 'Error: You are too fast, or this is a Bot. Please search now.');
}
// 3. Verify the token - CSRF protection
if (!$this->handler->verifySessionValue('token', $_POST['ls_token']) || !$this->handler->verifySessionValue('anti_bot', $_POST['ls_anti_bot'])) {
// Tokens are not matched
$this->handler->formResponse('failed', 'Error: Please refresh the page. It seems that your session is expired.');
}
try {
// 4. Start looking for the query
$result = json_encode($this->handler->getResult($_POST['ls_query_id'], $_POST['ls_query'], (int) $_POST['ls_current_page'], (int) $_POST['ls_items_per_page']));
} catch (\Exception $e) {
$catchedError = $e->getMessage();
}
if (empty($catchedError)) {
// 5. Return the result
$this->handler->formResponse('success', 'Successful request', $result);
} else {
$this->handler->formResponse('failed', $catchedError);
}
}
/**
* Calculate the timestamp difference between the time page is loaded
* and the time searching is started for the first time in seconds
*
* @param $page_loaded_at
* @return bool
*/
public function verifyBotSearched($page_loaded_at)
{
// if searching starts less than start time offset it seems it's a Bot
return time() - $page_loaded_at < Config::getConfig('searchStartTimeOffset') ? false : true;
}