Intercept uploaded file

[heitorprojects]

Hi,

I need to intercept an uploaded attachment file in the Backend article edit page, so that I can optimize it if it is a PDF, before it is saved.

Where is the best place in the code to apply this logic?

Thanks

[XzAeRo]

<?php echo $form->field($model, 'attachments')->widget(
    Upload::class,
    [
        'url' => ['/file/storage/upload'],
        'sortable' => true,
        'maxFileSize' => 10000000, // 10 MiB
        'maxNumberOfFiles' => 10,
    ]
) ?>

This is what appears in the _form.php file for the articles module. You see that the attachmets field has a configuration that send data to /file/storage/upload endpoint.

That endpoint is a controller using the yii2-starter-kit/yii2-file-kit actions.

So, in the file backend/modules/file/controllers/StorageController.php, in the upload action configuration parameters, you can add the on afterSave function signature.

This way, you can add watermarks or modify files just after they are stored in the server. For example:

public function actions(){
    return [
           'upload'=>[
               'class'=>'trntv\filekit\actions\UploadAction',
               //...
               'on afterSave' => function($event) {
                    /* @var $file \League\Flysystem\File */
                    $file = $event->file;

                    // create new Intervention Image
                    $img = Intervention\Image\ImageManager::make($file->read());

                    // insert watermark at bottom-right corner with 10px offset
                    $img->insert('public/watermark.png', 'bottom-right', 10, 10);

                    // save image
                    $file->put($img->encode());
               }
               //...
           ]
       ];
}

``

[heitorprojects]

Perfect! - Thanks for the prompt assistance.