Finish building out schedule management functionality

app/Http/Requests/Api/Client/Servers/Schedules/ViewScheduleRequest.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Pterodactyl\Http\Requests\Api\Client\Servers\Schedules;
+
+use Pterodactyl\Models\Task;
+use Pterodactyl\Models\Server;
+use Pterodactyl\Models\Schedule;
+use Pterodactyl\Models\Permission;
+use Pterodactyl\Http\Requests\Api\Client\ClientApiRequest;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+class ViewScheduleRequest extends ClientApiRequest
+{
+    /**
+     * Determine if this resource can be viewed.
+     *
+     * @return bool
+     */
+    public function authorize(): bool
+    {
+        if (! parent::authorize()) {
+            return false;
+        }
+
+        $server = $this->route()->parameter('server');
+        $schedule = $this->route()->parameter('schedule');
+
+        // If the schedule does not belong to this server throw a 404 error. Also throw an
+        // error if the task being requested does not belong to the associated schedule.
+        if ($server instanceof Server && $schedule instanceof Schedule) {
+            $task = $this->route()->parameter('task');
+
+            if ($schedule->server_id !== $server->id || ($task instanceof Task && $task->schedule_id !== $schedule->id)) {
+                throw new NotFoundHttpException(
+                    'The requested resource does not exist on the system.'
+                );
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * @return string
+     */
+    public function permission(): string
+    {
+        return Permission::ACTION_SCHEDULE_READ;
+    }
+}