Move the prefile event and add a new error exception (#1111)

* Move the prefile event and add a new error exception

* Remove extra import

* Add empty handler for testing

* Fix styling

* Fix styleci

app/Exceptions/PrefileError.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Exceptions;
+
+/**
+ * Prefile Error
+ *
+ * If listening to the prefile event message, use `throw new PrefileError("message message");`
+ * to abort the prefile process and send the message up to ACARS
+ */
+class PrefileError extends AbstractHttpException
+{
+    private $error;
+
+    public function __construct(string $error)
+    {
+        $this->error = $error;
+        parent::__construct(400, $error);
+    }
+
+    /**
+     * Return the RFC 7807 error type (without the URL root)
+     */
+    public function getErrorType(): string
+    {
+        return 'prefile-error';
+    }
+
+    /**
+     * Get the detailed error string
+     */
+    public function getErrorDetails(): string
+    {
+        return $this->getMessage();
+    }
+
+    /**
+     * Return an array with the error details, merged with the RFC7807 response
+     */
+    public function getErrorMetadata(): array
+    {
+        return [];
+    }
+}