This kit is designed to automate routine processes of uploading files, their saving and storage. It includes:

• File upload widget (based on Blueimp File Upload)
• Component for storing files (built on top of flysystem)
• Actions to download, delete, and view (download) files
• Behavior for saving files in the model and delete files when you delete a model

Demo

Since file kit is a part of yii2-starter-kit it's demo can be found in starter kit demo here.

File Storage

To work with the File Kit you need to configure FileStorage first. This component is a layer of abstraction over the filesystem

• Its main task to take on the generation of a unique name for each file and trigger corresponding events.

'fileStorage'=>[
    'class' => 'trntv\filekit\Storage',
    'baseUrl' => '@web/uploads'
    'filesystem'=> ...
        // OR
    'filesystemComponent' => ...    
],

There are several ways to configure Storage to work with flysystem.

1. Create a builder class that implements trntv\filekit\filesystem\FilesystemBuilderInterface and implement method build which returns filesystem object Example:

namespace app\components;

use League\Flysystem\Adapter\Local;
use League\Flysystem\Filesystem;
use League\Flysystem\Adapter\Local as Adapter;
use trntv\filekit\filesystem\FilesystemBuilderInterface;

class LocalFlysystemBuilder implements FilesystemBuilderInterface
{
    public $path;

    public function build()
    {
        $adapter = new Local(\Yii::getAlias($this->path));
        return new Filesystem($adapter);
    }
}

Configuration:

'fileStorage'=>[
    ...
    'filesystem'=> [
        'class' => 'app\components\FilesystemBuilder',
        'path' => '@webroot/uploads'
        ...
    ]
]

Read more about flysystem at http://flysystem.thephpleague.com/

Then you can use it like this:

$file = UploadedFile::getInstanceByName('file');
Yii::$app->fileStorage->save($file); // method will return new path inside filesystem
$files = UploadedFile::getInstancesByName('files');
Yii::$app->fileStorage->saveAll($files);

2. Use third-party extensions, creocoder/yii2-flysystem for example, and provide a name of the filesystem component in filesystemComponent Configuration:

'fs' => [
    'class' => 'creocoder\flysystem\LocalFilesystem',
    'path' => '@webroot/files'
    ...
],
'fileStorage'=>[
    ...
    'filesystemComponent'=> 'fs'
],

Actions

File Kit contains several Actions to work with uploads.

Upload Action

Designed to save the file uploaded by the widget

public function actions(){
    return [
           'upload'=>[
               'class'=>'trntv\filekit\actions\UploadAction',
               'validationRules' => [
                    ...
               ],
               'on afterSave' => function($event) {
                    /* @var $file \League\Flysystem\File */
                    $file = $event->file
                    // do something (resize, add watermark etc)
               }
           ]
       ];
}

See additional settings in the corresponding class

Delete Action

public function actions(){
    return [
       'delete'=>[
           'class'=>'trntv\filekit\actions\DeleteAction',
       ]
    ];
}

See additional settings in the corresponding class

View (Download) Action

public function actions(){
    return [
       'view'=>[
           'class'=>'trntv\filekit\actions\ViewAction',
       ]
    ];
}

See additional settings in the corresponding class

Upload Widget

Standalone usage

echo \trntv\filekit\widget\Upload::widget([
    'model'=>$model,
    'attribute'=>'files',
    'url'=>['upload'],
    'sortable'=>true,
    'maxFileSize'=>10 * 1024 * 1024, 
    'maxNumberOfFiles'=>3 // default 1
]);

With ActiveForm

echo $form->field($model, 'files')->widget(
    '\trntv\filekit\widget\Upload',
    [
        'url'=>['upload'],
        'sortable'=>true,
        'maxFileSize'=>10 * 1024 * 1024, // 10 MiB
        'maxNumberOfFiles'=>3 // default 1
    ]
);

UploadBehavior

This behavior is designed to save uploaded files in the corresponding relation.

Somewhere in model:

For multiple files

 public function behaviors()
 {
    return [
        'file' => [
            'class' => 'trntv\filekit\behaviors\UploadBehavior',
            'multiple' => true,
            'attribute' => 'files',
            'filesRelation' => 'uploadedFiles',
            'pathAttribute' => 'path',
            'baseUrlAttribute' => 'base_url',
            'typeAttribute' => 'type',
            'sizeAttribute' => 'size',
            'nameAttribute' => 'name',
            'orderAttribute' => 'order'
        ],
    ];
 }

For single file upload

 public function behaviors()
 {
     return [
          'file' => [
              'class' => 'trntv\filekit\behaviors\UploadBehavior',
              'attribute' => 'file',
              'pathAttribute' => 'path',
              'baseUrlAttribute' => 'base_url',
               ...
          ],
      ];
 }

See additional settings in the corresponding class.

Validation

There are two ways you can perform validation over uploads. On the client side validation is performed by Blueimp File Upload. Here is documentation about available options.

On the server side validation is performed by [[yii\web\UploadAction]], where you can configure validation rules for [[yii\base\DynamicModel]] that will be used in validation process