Get Token Authentication For Customer Logged With Facebook & Twitter : Magento 2

gistfile1.txt

/**
 * {@inheritdoc}
 */
public function createCustomerAccessToken($username, $password)
{
    $this->validatorHelper->validate($username, $password);
    $this->getRequestThrottler()->throttle($username, RequestThrottler::USER_TYPE_CUSTOMER);
    try {
        $customerDataObject = $this->accountManagement->authenticate($username, $password);
    } catch (\Exception $e) {
        $this->getRequestThrottler()->logAuthenticationFailure($username, RequestThrottler::USER_TYPE_CUSTOMER);
        throw new AuthenticationException(
            __('You did not sign in correctly or your account is temporarily disabled.')
        );
    }
    $this->getRequestThrottler()->resetAuthenticationFailuresCount($username, RequestThrottler::USER_TYPE_CUSTOMER);
    return $this->tokenModelFactory->create()->createCustomerToken($customerDataObject->getId())->getToken();
}