New in Symfony 2.8: Guard authentication component

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interface GuardAuthenticatorInterface
{
    /**
     * Get the authentication credentials from the request. If you return null,
     * authentication will be skipped.
     *
     * For example, for a form login, you might:
     *
     *      return array(
     *          'username' => $request->request->get('_username'),
     *          'password' => $request->request->get('_password'),
     *      );
     *
     * Or for an API token that's on a header, you might use:
     *
     *      return array('api_key' => $request->headers->get('X-API-TOKEN'));
     */
    public function getCredentials(Request $request);

    /**
     * Return a UserInterface object based on the credentials returned by getCredentials()
     */
    public function getUser($credentials, UserProviderInterface $userProvider);

    /**
     * Throw an AuthenticationException if the credentials returned by
     * getCredentials() are invalid.
     */
    public function checkCredentials($credentials, UserInterface $user);

    /**
     * Create an authenticated token for the given user. You can skip this
     * method by extending the AbstractGuardAuthenticator class from your
     * authenticator.
     */
    public function createAuthenticatedToken(UserInterface $user, $providerKey);

    /**
     * Called when authentication executed, but failed (e.g. wrong username password).
     */
    public function onAuthenticationFailure(Request $request, AuthenticationException $exception);

    /**
     * Called when authentication executed and was successful (for example a
     * RedirectResponse to the last page they visited)
     */
    public function onAuthenticationSuccess(Request $request, TokenInterface $token, $providerKey);

    /**
     * Does this method support remember me cookies?
     */
    public function supportsRememberMe();
}