Add support for generating a signed URL for downloading a file from the daemon

app/Repositories/Wings/DaemonBackupRepository.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Pterodactyl\Repositories\Wings;
+
+use Webmozart\Assert\Assert;
+use Pterodactyl\Models\Server;
+use Psr\Http\Message\ResponseInterface;
+use GuzzleHttp\Exception\TransferException;
+use Pterodactyl\Exceptions\Http\Connection\DaemonConnectionException;
+
+class DaemonBackupRepository extends DaemonRepository
+{
+    /**
+     * Returns a stream of a backup's contents from the Wings instance so that we
+     * do not need to send the user directly to the Daemon.
+     *
+     * @param string $backup
+     * @return \Psr\Http\Message\ResponseInterface
+     *
+     * @throws \Pterodactyl\Exceptions\Http\Connection\DaemonConnectionException
+     */
+    public function getBackup(string $backup): ResponseInterface
+    {
+        Assert::isInstanceOf($this->server, Server::class);
+
+        try {
+            return $this->getHttpClient()->get(
+                sprintf('/api/servers/%s/backup/%s', $this->server->uuid, $backup),
+                ['stream' => true]
+            );
+        } catch (TransferException $exception) {
+            throw new DaemonConnectionException($exception);
+        }
+    }
+}