Add support for storing SSH keys on user accounts

app/Http/Controllers/Api/Client/SSHKeyController.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Pterodactyl\Http\Controllers\Api\Client;
+
+use Illuminate\Http\JsonResponse;
+use Pterodactyl\Http\Requests\Api\Client\ClientApiRequest;
+use Pterodactyl\Transformers\Api\Client\SSHKeyTransformer;
+use Pterodactyl\Http\Requests\Api\Client\Account\StoreSSHKeyRequest;
+
+class SSHKeyController extends ClientApiController
+{
+    /**
+     * Returns all of the SSH keys that have been configured for the logged in
+     * user account.
+     */
+    public function index(ClientApiRequest $request): array
+    {
+        return $this->fractal->collection($request->user()->sshKeys)
+            ->transformWith($this->getTransformer(SSHKeyTransformer::class))
+            ->toArray();
+    }
+
+    /**
+     * Stores a new SSH key for the authenticated user's account.
+     */
+    public function store(StoreSSHKeyRequest $request): array
+    {
+        $model = $request->user()->sshKeys()->create([
+            'name' => $request->input('name'),
+            'public_key' => $request->input('public_key'),
+            'fingerprint' => $request->getKeyFingerprint(),
+        ]);
+
+        return $this->fractal->item($model)
+            ->transformWith($this->getTransformer(SSHKeyTransformer::class))
+            ->toArray();
+    }
+
+    /**
+     * Deletes an SSH key from the user's account.
+     */
+    public function delete(ClientApiRequest $request, string $identifier): JsonResponse
+    {
+        $request->user()->sshKeys()->where('fingerprint', $identifier)->delete();
+
+        return new JsonResponse([], JsonResponse::HTTP_NO_CONTENT);
+    }
+}