Support for Database Auth Variable Override

Author: tomykho

config/firebase.php

@@ -86,6 +86,17 @@
                  * https://my-project-id.firebaseio.com
                  */
                 'url' => env('FIREBASE_DATABASE_URL'),
+
+                /*
+                 * As a best practice, a service should have access to only the resources it needs. 
+                 * To get more fine-grained control over the resources a Firebase app instance can access, 
+                 * use a unique identifier in your Security Rules to represent your service.
+                 *
+                 * https://firebase.google.com/docs/database/admin/start#authenticate-with-limited-privileges
+                 */
+                // 'auth_variable_override' => [
+                //     'uid' => 'my-service-worker'
+                // ],
             ],
 
             'dynamic_links' => [

src/FirebaseProjectManager.php

@@ -80,6 +80,10 @@ protected function configure(string $name): FirebaseProject
             $factory = $factory->withDatabaseUri($databaseUrl);
         }
 
+        if ($authVariableOverride = $config['database']['auth_variable_override'] ?? null) {
+            $factory = $factory->withDatabaseAuthVariableOverride($authVariableOverride);
+        }
+
         if ($defaultStorageBucket = $config['storage']['default_bucket'] ?? null) {
             $factory = $factory->withDefaultStorageBucket($defaultStorageBucket);
         }

tests/FirebaseProjectManagerTest.php

@@ -221,6 +221,7 @@ public function the_realtime_database_url_can_be_configured(): void
     {
         $projectName = $this->app->config->get('firebase.default');
         $this->app->config->set('firebase.projects.'.$projectName.'.database.url', $url = 'https://domain.tld');
+        $this->app->config->set('firebase.projects.'.$projectName.'.database.auth_variable_override', ['uid' => 'some-uid']);
 
         $database = $this->app->make(Firebase\Database::class);