UWfile.php

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<?php

class UWfile
{
    public $params = array('path' => 'assets');

    public function init()
    {
        return array(
            'name' => __CLASS__,
            'label' => UserModule::t('File field'),
            'fieldType' => array('VARCHAR'),
            'params' => $this->params,
            'paramsLabels' => array(
                'path' => UserModule::t('Upload path'),
            ),
            'other_validator' => array(
                'file' => array(
                    'allowEmpty' => array('','false','true'),
                    'maxFiles' => '',
                    'maxSize' => '',
                    'minSize' => '',
                    'tooLarge' => '',
                    'tooMany' => '',
                    'tooSmall' => '',
                    'types' => '',
                    'wrongType' => '',
                ),
            ),
        );
    }

    public function setAttributes($value, $model, $field_varname)
    {
        $value = CUploadedFile::getInstance($model, $field_varname);

        if ($value) {
            $old_file = $model->getAttribute($field_varname);
            $file_name = $this->params['path'].'/'.$value->name;
            if (file_exists($file_name)) {
                $file_name = str_replace('.'.$value->extensionName, '-'.time().'.'.$value->extensionName, $file_name);
            }
            if ($model->validate()) {
                if ($old_file && file_exists($old_file)) {
                    unlink($old_file);
                }
                $value->saveAs($file_name);
            }
            $value = $file_name;
        } else {
            if (isset($_POST[get_class($model)]['uwfdel'][$field_varname]) && $_POST[get_class($model)]['uwfdel'][$field_varname]) {
                $old_file = $model->getAttribute($field_varname);
                if ($old_file && file_exists($old_file)) {
                    unlink($old_file);
                }
                $value = '';
            } else {
                $value = $model->getAttribute($field_varname);
            }
        }

        return $value;
    }

    public function viewAttribute($model, $field)
    {
        $file = $model->getAttribute($field->varname);
        if ($file) {
            $file = Yii::app()->baseUrl.'/'.$file;

            return CHtml::link($file, $file);
        } else {
            return '';
        }
    }

    public function editAttribute($model, $field, $params = array())
    {
        if (!isset($params['options'])) {
            $params['options'] = array();
        }
        $options = $params['options'];
        unset($params['options']);

        return CHtml::activeFileField($model, $field->varname, $params)
        .(($model->getAttribute($field->varname)) ? '<br/>'.CHtml::activeCheckBox($model, '[uwfdel]'.$field->varname, $params)
        .' '.CHtml::activeLabelEx($model, '[uwfdel]'.$field->varname, array('label' => UserModule::t('Delete file'), 'style' => 'display:inline;')) : '')
        ;
    }
}