Installing and managing modules from admin panel (#847)

app/Exceptions/ModuleExistsException.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Exceptions;
+
+class ModuleExistsException extends AbstractHttpException
+{
+    private $module_name;
+
+    public function __construct($module_name)
+    {
+        $this->module_name = $module_name;
+        parent::__construct(
+            409,
+            'Module '.$module_name.' Already Exists!'
+        );
+    }
+
+    /**
+     * Return the RFC 7807 error type (without the URL root)
+     */
+    public function getErrorType(): string
+    {
+        return 'module-already-exists';
+    }
+
+    /**
+     * 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 [];
+    }
+}