reorganize and cleanup php server code

server/app/Services/Auth/TwoFactor/Contracts/Provider.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Vanguard\Services\Auth\TwoFactor\Contracts;
+
+use Vanguard\Services\Auth\TwoFactor\Contracts\Authenticatable as TwoFactorAuthenticatable;
+
+interface Provider
+{
+    /**
+     * Determine if the given user has two-factor authentication enabled.
+     *
+     * @param Authenticatable $user
+     * @return bool
+     */
+    public function isEnabled(TwoFactorAuthenticatable $user);
+
+    /**
+     * Register the given user with the provider.
+     *
+     * @param Authenticatable $user
+     */
+    public function register(TwoFactorAuthenticatable $user);
+
+    /**
+     * Sends an SMS with a phone verification token.
+     * @param Authenticatable $user
+     * @return mixed
+     */
+    public function sendTwoFactorVerificationToken(TwoFactorAuthenticatable $user);
+
+    /**
+     * Determine if the given token is valid for the given user.
+     *
+     * @param Authenticatable $user
+     * @param  string $token
+     * @return bool
+     */
+    public function tokenIsValid(TwoFactorAuthenticatable $user, $token);
+
+    /**
+     * Delete the given user from the provider.
+     *
+     * @param Authenticatable $user
+     * @return bool
+     */
+    public function delete(TwoFactorAuthenticatable $user);
+}