Add basic auditing for filesystem actions

Specifically skipping read actions since there isn't much to say there, and it generally wouldn't be very helpful (plus, likely to generate lots of logs).

app/Models/Server.php

@@ -2,6 +2,7 @@
 
 namespace Pterodactyl\Models;
 
+use Closure;
 use Illuminate\Notifications\Notifiable;
 use Illuminate\Database\Query\JoinClause;
 use Znck\Eloquent\Traits\BelongsToThrough;
@@ -335,7 +336,7 @@ class Server extends Model
      * @param array $metadata
      * @return \Pterodactyl\Models\AuditLog
      */
-    public function audit(string $action, array $metadata): AuditLog
+    public function newAuditEvent(string $action, array $metadata): AuditLog
     {
         $model = AuditLog::factory($action, $metadata)->fill([
             'server_id' => $this->id,
@@ -345,6 +346,32 @@ class Server extends Model
         return $model;
     }
 
+    /**
+     * Stores a new audit event for a server by using a transaction. If the transaction
+     * fails for any reason everything executed within will be rolled back. The callback
+     * passed in will receive the AuditLog model before it is saved and the second argument
+     * will be the current server instance. The callback should modify the audit entry as
+     * needed before finishing, any changes will be persisted.
+     *
+     * The response from the callback is returned to the caller.
+     *
+     * @param string $action
+     * @param \Closure $callback
+     * @return mixed
+     * @throws \Throwable
+     */
+    public function audit(string $action, Closure $callback)
+    {
+        $model = $this->newAuditEvent($action, []);
+
+        return $this->getConnection()->transaction(function () use ($callback, &$model) {
+            $response = $callback($model, $this);
+            $model->save();
+
+            return $response;
+        });
+    }
+
     /**
      * @return \Illuminate\Database\Eloquent\Relations\HasMany
      */