CredentialsValidator.php

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<?php
namespace Magento\Integration\Model;

use Magento\Framework\Exception\InputException;

class CredentialsValidator
{
    public function validate($username, $password)
    {
        $exception = new InputException();
        if (!is_string($username) || strlen($username) == 0) {
            $exception->addError(__('"%fieldName" is required. Enter and try again.', ['fieldName' => 'username']));
        }
        if (!is_string($password) || strlen($password) == 0) {
            $exception->addError(__('"%fieldName" is required. Enter and try again.', ['fieldName' => 'password']));
        }
        if ($exception->wasErrorAdded()) {
            throw $exception;
        }
    }
}