Refactor error handling internally to follow RFC7807 (#362)

* Refactor error handling internally to follow RFC7807

* style fixes

app/Exceptions/Converters/ValidationException.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Exceptions\Converters;
+
+use App\Exceptions\HttpException;
+use Illuminate\Support\Facades\Log;
+use Illuminate\Validation\ValidationException as IlluminateValidationException;
+
+class ValidationException extends HttpException
+{
+    private $validationException;
+    private $errorDetail;
+    private $errors;
+
+    public function __construct(IlluminateValidationException $validationException)
+    {
+        $this->validationException = $validationException;
+        $this->processValidationErrors();
+
+        parent::__construct(
+            400,
+            'Validation exception'
+        );
+    }
+
+    private function processValidationErrors()
+    {
+        $error_messages = [];
+        $this->errors = $this->validationException->errors();
+        foreach ($this->errors as $field => $error) {
+            $error_messages[] = implode(', ', $error);
+        }
+
+        $this->errorDetail = implode(', ', $error_messages);
+        // Log::error('Validation errors', $this->errors);
+    }
+
+    /**
+     * Return the RFC 7807 error type (without the URL root)
+     */
+    public function getErrorType(): string
+    {
+        return 'validation-exception';
+    }
+
+    /**
+     * Return an array with the error details, merged with the RFC7807 response
+     */
+    public function getErrorDetails(): string
+    {
+        return $this->errorDetail;
+    }
+
+    /**
+     * Return an array with the error details, merged with the RFC7807 response
+     */
+    public function getErrorMetadata(): array
+    {
+        return [
+            'errors' => $this->errors,
+        ];
+    }
+}