laravel#39: Handle API error codes & messages

app/Http/Requests/FormRequest.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Contracts\Validation\Validator;
+use Illuminate\Foundation\Http\FormRequest as LaravelFormRequest;
+use Illuminate\Http\Exceptions\HttpResponseException;
+use Illuminate\Http\JsonResponse;
+
+abstract class FormRequest extends LaravelFormRequest
+{
+    /**
+     * @return mixed
+     */
+    abstract public function rules();
+
+    /**
+     * @param Validator $validator
+     *
+     * @return array
+     */
+    protected function formatErrors(Validator $validator)
+    {
+        $transformed = [];
+
+        $errors = $validator->errors()->getMessages();
+        $obj = $validator->failed();
+
+        foreach ($obj as $input => $rules) {
+            $i = 0;
+            $fieldErrors = [];
+
+            foreach ($rules as $rule => $ruleInfo) {
+                $fieldErrors[] = [
+                    'code' => 'errors.'.lcfirst(class_basename($rule)),
+                    'message' => $errors[$input][$i],
+                ];
+                ++$i;
+            }
+
+            $transformed[] = ["$input" => $fieldErrors];
+        }
+
+        return ['errors' => $transformed];
+    }
+
+    /**
+     * @param Validator $validator
+     */
+    protected function failedValidation(Validator $validator)
+    {
+        throw new HttpResponseException(
+            response()->json($this->formatErrors($validator),
+            JsonResponse::HTTP_UNPROCESSABLE_ENTITY)
+        );
+    }
+}