Introduce an API endpoint to obtain public keys, that can be used to verify access tokens on other services

api/controllers/PublicKeysController.php

@@ -0,0 +1,35 @@
+<?php
+declare(strict_types=1);
+
+namespace api\controllers;
+
+use api\filters\NginxCache;
+use Yii;
+use yii\helpers\ArrayHelper;
+use yii\web\Controller as BaseController;
+
+final class PublicKeysController extends BaseController {
+
+    public function behaviors(): array {
+        return ArrayHelper::merge(parent::behaviors(), [
+            'nginxCache' => [
+                'class' => NginxCache::class,
+                'rules' => [
+                    'index' => 3600, // 1h
+                ],
+            ],
+        ]);
+    }
+
+    public function actionIndex(): array {
+        return [
+            'keys' => [
+                [
+                    'alg' => 'ES256', // Hardcoded for awhile since right now there is no way to find used algo
+                    'pem' => Yii::$app->tokens->getPublicKey(),
+                ],
+            ],
+        ];
+    }
+
+}