From 0c66bd6872576089713701ace677cec79d3d4d05 Mon Sep 17 00:00:00 2001
From: Franz Liedke <franz@develophp.org>
Date: Sat, 20 Jun 2015 19:45:32 +0200
Subject: [PATCH] Implement middleware for handling errors according to JSON
 API spec

---
 .../core/src/Api/Middleware/JsonApiErrors.php | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 framework/core/src/Api/Middleware/JsonApiErrors.php

diff --git a/framework/core/src/Api/Middleware/JsonApiErrors.php b/framework/core/src/Api/Middleware/JsonApiErrors.php
new file mode 100644
index 000000000..8345b878e
--- /dev/null
+++ b/framework/core/src/Api/Middleware/JsonApiErrors.php
@@ -0,0 +1,36 @@
+<?php namespace Flarum\Api\Middleware;
+
+use Psr\Http\Message\ResponseInterface as Response;
+use Psr\Http\Message\ServerRequestInterface as Request;
+use Zend\Diactoros\Response\StringResponse;
+use Zend\Stratigility\ErrorMiddlewareInterface;
+
+class JsonApiErrors implements ErrorMiddlewareInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function __invoke($error, Request $request, Response $response, callable $out = null)
+    {
+        $errorObject = [
+            'title' => $error->getMessage(),
+        ];
+
+        $status = 500;
+
+        // If it seems to be a valid HTTP status code, we pass on the
+        // exception's status.
+        $errorCode = $error->getCode();
+        if (is_int($errorCode) && $errorCode >= 400 && $errorCode < 600) {
+            $status = $errorCode;
+        }
+
+        // JSON API errors must be collected in an array under the
+        // "errors" key in the top level of the document
+        $data = [
+            'errors' => [$errorObject]
+        ];
+
+        return StringResponse::json($data, $status);
+    }
+}