Refactor currency API

app/Api/V2/Controllers/Model/Currency/IndexController.php

@@ -0,0 +1,53 @@
+<?php
+declare(strict_types=1);
+
+namespace FireflyIII\Api\V2\Controllers\Model\Currency;
+
+use FireflyIII\Api\V2\Controllers\Controller;
+use FireflyIII\Repositories\UserGroups\Currency\CurrencyRepositoryInterface;
+use FireflyIII\Transformers\V2\CurrencyTransformer;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Pagination\LengthAwarePaginator;
+
+/**
+ * Class IndexController
+ */
+class IndexController extends Controller
+{
+    private CurrencyRepositoryInterface $repository;
+
+    public function __construct()
+    {
+        parent::__construct();
+        $this->middleware(
+            function ($request, $next) {
+                $this->repository = app(CurrencyRepositoryInterface::class);
+
+                return $next($request);
+            }
+        );
+    }
+
+    /**
+     * TODO This endpoint is not yet documented.
+     *
+     * Display a listing of the resource.
+     *
+     * @return JsonResponse
+     */
+    public function index(): JsonResponse
+    {
+        $bills       = $this->repository->getAll();
+        $pageSize    = $this->parameters->get('limit');
+        $count       = $bills->count();
+        $bills       = $bills->slice(($this->parameters->get('page') - 1) * $pageSize, $pageSize);
+        $paginator   = new LengthAwarePaginator($bills, $count, $pageSize, $this->parameters->get('page'));
+        $transformer = new CurrencyTransformer();
+        $transformer->setParameters($this->parameters); // give params to transformer
+
+        return response()
+            ->json($this->jsonApiList('currencies', $paginator, $transformer))
+            ->header('Content-Type', self::CONTENT_TYPE);
+    }
+
+}