Add support of web validation errors

If this package is used in an application that uses api AND common web parts together, package should support native Laravel form validation flow like `response()->withErrors([])`. 

This change will handle this behaviour. You can just throw validation exception, and everything will work.

src/ExceptionHandlerTrait.php

@@ -36,9 +36,9 @@ public function render($request, Exception $e)
     {
         $e = $this->resolveException($e);
 
-        $response = $request->expectsJson() || !function_exists('view')
-            ? $this->renderForApi($e)
-            : $this->renderHtmlPage($e);
+        $response = $request->expectsJson() || ! function_exists('view')
+            ? $this->renderForApi($e, $request)
+            : $this->renderForHtml($e, $request);
 
         return $response->withException($e);
     }
@@ -47,9 +47,10 @@ public function render($request, Exception $e)
      * Render exceptions for json API.
      *
      * @param  ApiException $e
+     * @param  \Illuminate\Http\Request $request
      * @return \Illuminate\Http\JsonResponse
      */
-    protected function renderForApi(ApiException $e)
+    protected function renderForApi(ApiException $e, $request)
     {
         return response()->json($e, $e->getCode(), $e->getHeaders());
     }
@@ -58,17 +59,32 @@ protected function renderForApi(ApiException $e)
      * Render exception for common html request.
      *
      * @param  ApiException $e
+     * @param  \Illuminate\Http\Request  $request
      * @return \Illuminate\Http\JsonResponse|\Illuminate\Http\Response
      */
-    protected function renderHtmlPage(ApiException $e)
+    protected function renderForHtml(ApiException $e, $request)
     {
         $status = $e->getCode();
 
-        return view()->exists("errors.{$status}")
-            ? response(view("errors.{$status}", ['exception' => $e]), $status, $e->getHeaders())
-            : (view()->exists("laravel-api-exceptions::errors.{$status}")
-                ? response(view("laravel-api-exceptions::errors.{$status}", ['exception' => $e]), $status, $e->getHeaders())
-                : $this->renderForApi($e));
+        return $e instanceof ValidationFailedApiException
+            ? $this->convertValidationApiExceptionToResponse($e, $request)
+            : (view()->exists("errors.{$status}")
+                ? response(view("errors.{$status}", ['exception' => $e]), $status, $e->getHeaders())
+                : (view()->exists("laravel-api-exceptions::errors.{$status}")
+                    ? response(view("laravel-api-exceptions::errors.{$status}", ['exception' => $e]), $status, $e->getHeaders())
+                    : $this->renderForApi($e, $request)));
+    }
+
+    /**
+     * Create a response object from the given validation exception.
+     *
+     * @param  ValidationFailedApiException  $e
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Symfony\Component\HttpFoundation\Response
+     */
+    protected function convertValidationApiExceptionToResponse(ValidationFailedApiException $e, $request)
+    {
+        return redirect()->back()->withInput($request->input())->withErrors($e->getNativeErrors());
     }
 
     /**