API key UI changes and backend storage of the keys

app/Http/Middleware/API/AuthenticateKey.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace Pterodactyl\Http\Middleware\API;
+
+use Closure;
+use Illuminate\Http\Request;
+use Pterodactyl\Contracts\Repository\ApiKeyRepositoryInterface;
+
+class AuthenticateKey
+{
+    /**
+     * @var \Pterodactyl\Contracts\Repository\ApiKeyRepositoryInterface
+     */
+    private $repository;
+
+    /**
+     * AuthenticateKey constructor.
+     *
+     * @param \Pterodactyl\Contracts\Repository\ApiKeyRepositoryInterface $repository
+     */
+    public function __construct(ApiKeyRepositoryInterface $repository)
+    {
+        $this->repository = $repository;
+    }
+
+    /**
+     * Handle an API request by verifying that the provided API key
+     * is in a valid format, and the route being accessed is allowed
+     * for the given key.
+     *
+     * @param \Illuminate\Http\Request $request
+     * @param \Closure                 $next
+     */
+    public function handle(Request $request, Closure $next)
+    {
+        $this->repository->findFirstWhere([
+            '',
+        ]);
+    }
+}