feat/swagger (#24)

Reviewed-on: #24
Co-authored-by: Ron Rise <ron@siteworxpro.com>
Co-committed-by: Ron Rise <ron@siteworxpro.com>

src/Controllers/OpenApiController.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Siteworxpro\App\Controllers;
+
+use Nyholm\Psr7\Response;
+use Nyholm\Psr7\ServerRequest;
+use OpenApi\Generator;
+use Psr\Http\Message\ResponseInterface;
+
+class OpenApiController extends Controller
+{
+    /**
+     * Handles the GET request to generate and return the OpenAPI specification.
+     *
+     * @param ServerRequest $request
+     * @return ResponseInterface
+     */
+    public function get(ServerRequest $request): ResponseInterface
+    {
+        $openapi = new Generator()->generate([
+            __DIR__ . '/../Controllers',
+            __DIR__ . '/../Models',
+            __DIR__ . '/../Http/Responses',
+        ]);
+
+        $response = new Response();
+
+        if (
+            $request->getHeaderLine('Accept') === 'application/json' ||
+            str_contains($request->getUri()->getPath(), '.json')
+        ) {
+            $response->getBody()->write($openapi->toJson());
+            return $response->withHeader('Content-Type', 'application/json');
+        }
+
+        $response->getBody()->write($openapi->toYaml());
+        return $response->withHeader('Content-Type', 'application/x-yaml');
+    }
+}