public function dispatch($input)
{
if (!isset($input['signature'])) {
throw new Duoshuo_Exception('Invalid signature.', Duoshuo_Exception::INVALID_SIGNATURE);
}
$signature = $input['signature'];
unset($input['signature']);
ksort($input);
$baseString = http_build_query($input, null, '&');
$expectSignature = base64_encode(Duoshuo_Abstract::hmacsha1($baseString, $this->plugin->getOption('secret')));
if ($signature !== $expectSignature) {
throw new Duoshuo_Exception('Invalid signature, expect: ' . $expectSignature . '. (' . $baseString . ')', Duoshuo_Exception::INVALID_SIGNATURE);
}
$method = $input['action'];
if (!method_exists($this, $method)) {
throw new Duoshuo_Exception('Unknown action.', Duoshuo_Exception::OPERATION_NOT_SUPPORTED);
}
$this->response = array();
$this->{$method}($input);
$this->sendResponse();
}
