Don't allow cancels from certain states (#396)

* Don't allow cancels from certain states

* Unused imports

* Don't reset the state doubly

* Move SetUserActive into listener; code cleanup

* Unused imports

* Add missing files into htaccess

* Move Command contract to correct folder

app/Exceptions/PirepCancelNotAllowed.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Exceptions;
+
+use App\Models\Pirep;
+
+class PirepCancelNotAllowed extends HttpException
+{
+    private $pirep;
+
+    public function __construct(Pirep $pirep)
+    {
+        $this->pirep = $pirep;
+        parent::__construct(
+            400,
+            'This PIREP can\'t be cancelled'
+        );
+    }
+
+    /**
+     * Return the RFC 7807 error type (without the URL root)
+     */
+    public function getErrorType(): string
+    {
+        return 'pirep-cancel-not-allowed';
+    }
+
+    public function getErrorDetails(): string
+    {
+        return $this->getMessage();
+    }
+
+    public function getErrorMetadata(): array
+    {
+        return [
+            'pirep_id' => $this->pirep->id,
+            'state'    => $this->pirep->state,
+        ];
+    }
+}