initial commit

app/Services/Google/ApiAuthService.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Services\Google;
+
+use Google\Client;
+
+class ApiAuthService
+{
+    /**
+     * @throws \Google\Exception
+     */
+    public function getAccessToken(): string
+    {
+        $client = new Client();
+        $serviceAccountKeyPath = env('GOOGLE_APPLICATION_CREDENTIALS');
+        $client->setAuthConfig($serviceAccountKeyPath);
+        $client->addScope('https://www.googleapis.com/auth/cloud-platform');
+        $client->fetchAccessTokenWithAssertion();
+
+        // todo - cache, refresh, etc
+        $accessToken = $client->getAccessToken();
+
+        return $accessToken['access_token'];
+    }
+}