Some refactoring to allow catching exceptions in shortcode class code, added validation helper function to shortcode class

Author: vedmant

readme.md

@@ -155,7 +155,7 @@ common data types. The $casts property should be an array where the key is the n
 being cast and the value is the type you wish to cast the column to. The supported cast types are: 
 `int`, `integer`, `real`, `float`, `double`, `boolean`, `array` (comma separated values) and `date`. 
 
-```blade
+```php
 class YourShortcode extends Shortcode
 {
     /**
@@ -173,12 +173,37 @@ Now the `show_ids` attribute will always be cast to an array when you access it.
 (array attributes are casted from comma separated string, eg. "1,2,3").
 
 
-### Option to not throw exceptions from views
+### Attribute validation
+
+There is a simple way to validate attributes.
+Error messages will be rendered on the shortcode place.
+For convenients it will return attributes.
+
+```php
+class YourShortcode extends Shortcode
+{
+    /**
+     * Render shortcode
+     *
+     * @param string $content
+     * @return string
+     */
+    public function render($content)
+    {
+        $atts = $this->validate([
+            'post_id' => 'required|numeric|exists:posts,id', 
+        ]);
+    
+        //
+    }
+}
+```
+
+### Option to not throw exceptions from shortcodes
 
-There is a useful option to aviod server (500) error for whole page when one of shortocode views has thrown an exception.
+There is a useful option to aviod server (500) error for whole page when one of shortocode has thrown an exception.
 
 To enable it set `'throw_exceptions' => false,` in the `shortcodes.php` config file. 
-It works only when `$this->view('some-view');` method is used in the shortcode class.
 
 This will render exception details in the place of a shortcode and will not crash whole page request with 500 error.
 It will still log exception to a log file and report to [Sentry](https://sentry.io/) if it's integrated.
@@ -211,8 +236,6 @@ $ vendor/bin/phpunit
 
 ## TODO
 
-1. Integrate Laravel Telescope
-1. Attributes validation
 1. Add custom widget for debugbar integration
 1. Create performance profile tests, optimize performance
 

src/Manager.php

@@ -13,17 +13,20 @@ class Manager
     use Macroable;
 
     /**
-     * @var array
+     * @var array Configuration
      */
     public $config;
+
     /**
      * @var array Shared attributes
      */
     public $shared = [];
+
     /**
      * @var Application
      */
     protected $app;
+
     /**
      * @var Renderer
      */

src/Renderer.php

@@ -4,7 +4,11 @@
 
 use Exception;
 use Illuminate\Contracts\Foundation\Application;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Traits\Macroable;
+use Illuminate\Validation\ValidationException;
+use Throwable;
 
 class Renderer
 {
@@ -121,7 +125,7 @@ private function doShortcodeTag($m)
             if (! $instance instanceof Shortcode) {
                 $content = "Class {$shortcode} is not an instance of " . Shortcode::class;
             } else {
-                $content = $m[1] . $instance->render(isset($m[5]) ? $m[5] : null) . $m[6];
+                $content = $m[1] . $this->renderShortcode($instance, isset($m[5]) ? $m[5] : null) . $m[6];
             }
         } else {
             $content = "Class {$shortcode} doesn't exists";
@@ -132,6 +136,36 @@ private function doShortcodeTag($m)
         return $content;
     }
 
+    /**
+     * Render shortcode from the class instance
+     *
+     * @param Shortcode   $shortcode
+     * @param string|null $content
+     * @return string
+     */
+    private function renderShortcode(Shortcode $shortcode, $content)
+    {
+        try {
+            return $shortcode->render($content);
+        } catch (ValidationException $e) {
+            return 'Validation error: <br>' . implode('<br>', Arr::flatten($e->errors()));
+        } catch (Throwable $e) {
+            if ($this->manager->config['throw_exceptions']) {
+                throw $e;
+            }
+
+            Log::error($e);
+            // Report to sentry if it's intergated
+            if (class_exists('Sentry')) {
+                if (app()->environment('production')) {
+                    \Sentry::captureException($e);
+                }
+            }
+
+            return "[$shortcode->tag] " . get_class($e) . ' ' . $e->getMessage();
+        }
+    }
+
     /**
      * Record rendered shortcode info.
      *

src/Shortcode.php

@@ -6,9 +6,7 @@
 use Illuminate\Contracts\Foundation\Application;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
-use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Traits\Macroable;
-use Throwable;
 
 abstract class Shortcode implements ShortcodeContract
 {
@@ -29,6 +27,11 @@ abstract class Shortcode implements ShortcodeContract
      */
     public $attributes = [];
 
+    /**
+     * @var string Rendered tag name
+     */
+    public $tag;
+
     /**
      * @var Manager
      */
@@ -46,11 +49,6 @@ abstract class Shortcode implements ShortcodeContract
      */
     protected $casts = [];
 
-    /**
-     * @var string Rendered tag name
-     */
-    protected $tag;
-
     /**
      * AbstractShortcode constructor.
      *
@@ -77,6 +75,21 @@ public function atts(): array
         return $this->applyDefaultAtts($this->attributes(), $this->atts);
     }
 
+    /**
+     * Validate and return attributes
+     *
+     * @param array $rules
+     * @return array
+     */
+    public function validate(array $rules)
+    {
+        $atts = $this->atts();
+
+        $this->app->make('validator')->validate($this->atts(), $rules);
+
+        return $atts;
+    }
+
     /**
      * Combine user attributes with known attributes and fill in defaults when needed.
      *
@@ -134,24 +147,7 @@ public function shared($key = null, $defatul = null)
      */
     protected function view($name, $data = [])
     {
-        if ($this->manager->config['throw_exceptions']) {
-            return $this->app['view']->make($name, $data)->render();
-        }
-
-        // Render view without throwing exceptions
-        try {
-            return $this->app['view']->make($name, $data)->renderSimple();
-        } catch (Throwable $e) {
-            Log::error($e);
-            // Report to sentry if it's intergated
-            if (class_exists('Sentry')) {
-                if (app()->environment('production')) {
-                    \Sentry::captureException($e);
-                }
-            }
-
-            return "[$this->tag] ".get_class($e).' '.$e->getMessage();
-        }
+        return $this->app['view']->make($name, $data)->render();
     }
 
     /**

tests/Resources/ExceptionShortcode.php

@@ -30,6 +30,6 @@ class ExceptionShortcode extends Shortcode
      */
     public function render($content)
     {
-        return $this->view('shortcode-exception');
+        return $someUnknownVar;
     }
 }

tests/Resources/ExceptionViewShortcode.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace Vedmant\LaravelShortcodes\Tests\Resources;
+
+use Vedmant\LaravelShortcodes\Shortcode;
+
+class ExceptionViewShortcode extends Shortcode
+{
+    /**
+     * @var string Shortcode description
+     */
+    public $description = 'Exception shortcode for test';
+
+    /**
+     * @var array Shortcode attributes with default values
+     */
+    public $attributes = [
+        'class' => [
+            'default'     => '',
+            'description' => 'Class name',
+            'sample'      => 'some-class',
+        ],
+    ];
+
+    /**
+     * Render shortcode.
+     *
+     * @param string $content
+     * @return string
+     */
+    public function render($content)
+    {
+        return $this->view('shortcode-exception');
+    }
+}

tests/Resources/ValidationShortcode.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Vedmant\LaravelShortcodes\Tests\Resources;
+
+use Vedmant\LaravelShortcodes\Shortcode;
+
+class ValidationShortcode extends Shortcode
+{
+    /**
+     * @var string Shortcode description
+     */
+    public $description = 'Test shortcode with validation';
+
+    /**
+     * @var array Shortcode attributes with default values
+     */
+    public $attributes = [
+        'required' => [
+            'default' => '',
+        ],
+        'string' => [
+            'default' => '',
+        ],
+        'numeric' => [
+            'default' => '',
+        ],
+    ];
+
+    /**
+     * Render shortcode.
+     *
+     * @param string $content
+     * @return string
+     */
+    public function render($content)
+    {
+        $this->validate([
+            'required' => 'required',
+            'string'   => 'required|string',
+            'numeric'  => 'required|numeric',
+        ]);
+
+        return 'Success';
+    }
+}

tests/Unit/ShortcodeTest.php

@@ -3,7 +3,9 @@
 namespace Vedmant\LaravelShortcodes\Tests\Unit;
 
 use Carbon\Carbon;
+use Illuminate\Validation\ValidationException;
 use Vedmant\LaravelShortcodes\Tests\Resources\CastsShortcode;
+use Vedmant\LaravelShortcodes\Tests\Resources\ValidationShortcode;
 use Vedmant\LaravelShortcodes\Tests\TestCase;
 
 class ShortcodeTest extends TestCase
@@ -38,4 +40,16 @@ public function testCasts()
         $this->assertIsArray($atts['json']);
         $this->assertInstanceOf(Carbon::class, $atts['date']);
     }
+
+    public function testValidation()
+    {
+        $shortcode = new ValidationShortcode($this->app, $this->manager, [], 'validation');
+
+        try {
+            $shortcode->render(null);
+            $this->fail('Expected ValidationException not thrown');
+        } catch(ValidationException $e) {
+            $this->assertCount(3, $e->errors());
+        }
+    }
 }

tests/Unit/ViewTest.php

@@ -3,6 +3,8 @@
 namespace Vedmant\LaravelShortcodes\Tests\Unit;
 
 use Vedmant\LaravelShortcodes\Tests\Resources\ExceptionShortcode;
+use Vedmant\LaravelShortcodes\Tests\Resources\ExceptionViewShortcode;
+use Vedmant\LaravelShortcodes\Tests\Resources\ValidationShortcode;
 use Vedmant\LaravelShortcodes\Tests\TestCase;
 
 class ViewTest extends TestCase
@@ -73,6 +75,17 @@ public function testRenderWithoutThrowing()
 
         $rendered = $this->app['view']->make('exception')->render();
 
+        $this->assertStringStartsWith('[exception] ErrorException Undefined variable: someUnknownVar', (string) $rendered);
+    }
+
+    public function testRenderWithoutThrowingInView()
+    {
+        $this->manager->config['throw_exceptions'] = false;
+        $this->addViewsPath();
+        $this->manager->add('exception', ExceptionViewShortcode::class);
+
+        $rendered = $this->app['view']->make('exception')->render();
+
         $this->assertStringStartsWith('[exception] ErrorException Undefined variable: notExisting ', (string) $rendered);
     }
 
@@ -82,11 +95,32 @@ public function testRenderWithThrowing()
         $this->addViewsPath();
         $this->manager->add('exception', ExceptionShortcode::class);
 
+        $this->expectExceptionMessage('Undefined variable: someUnknownVar');
+
+        $rendered = $this->app['view']->make('exception')->render();
+    }
+
+    public function testRenderWithThrowingInView()
+    {
+        $this->manager->config['throw_exceptions'] = true;
+        $this->addViewsPath();
+        $this->manager->add('exception', ExceptionViewShortcode::class);
+
         $this->expectExceptionMessage('Undefined variable: notExisting');
 
         $rendered = $this->app['view']->make('exception')->render();
     }
 
+    public function testRenderWithValidation()
+    {
+        $this->addViewsPath();
+
+        $this->manager->add('validation', ValidationShortcode::class);
+
+        $rendered = $this->manager->render('[validation]');
+        $this->assertEquals('Validation error: <br>The required field is required.<br>The string field is required.<br>The numeric field is required.', (string) $rendered);
+    }
+
     private function addViewsPath()
     {
         app('view')->addLocation(__DIR__.'/../views');