Model_File.php

<?php

class Model_File extends LF_Model {

    public $table = 'file';
    public $storage = null;

    public $local_copy = null;

    function init(){
        parent::init();

        $this->addField('location');     // e.g. s3://bucket/file or http://host/file, or file://path/to/file
        $this->addField('url');          // public access URL if file is available
        $this->addField('storage');      // storage controller used

        $this->addField('status')->enum(['draft','uploaded','verified']);

        $this->containsOne(['file_metadata', 'json'=>true], [$this, 'initFileMetadata']);

        $this->addHook('beforeDelete,afterUnload', $this);
    }

    function initFileMetadata($m){
        $m->addField('extension');
        $m->addField('size');
        $m->addField('md5');
        $m->addField('original_filename');

        $m->addField('is_image')->type('boolean');
        $m->addField('mime');
        $m->addField('width');
        $m->addField('height');
    }

    /**
     * Call to associate with a file storage service (such as Amazon S3)
     */
    function setStorage($controller){
        $controller = $this->api->normalizeClassName($controller, 'Storage');
        $this->storage = $this->setController($controller);
        return $this;
    }

    function import($source){
        if(!$this->storage)throw $this->exception('Set Storage Controller first');

        $this->unload();
        $this['satus']='draft';
        $this->save();

        $m = $this->ref('file_metadata');
        $m['original_filename'] = basename($source);
        $m['size'] = filesize($source);
        $m['extension'] = pathinfo($source, PATHINFO_EXTENSION);

        // TODO: that's only for images
        $is = getimagesize($source);
        if($m['is_image'] = (boolean)$is){
            $m['mime'] = $is['mime'];
            $m['width'] = $is[0];
            $m['height'] = $is[1];
            $m['md5'] = md5_file($source);
            //$m['extension'] = $is['mime'];
        }

        $m->save();

        $this->storage->put($this, $source);
        $this['status']='uploaded';
        //$this->local_copy = $source;
        $m->save();
    }

    /**
     * Verify that the file is uploaded correctly
     * @param  [type] $source [description]
     * @return [type]         [description]
     */
    function verify($source = null){
        // make sure, that public URL is accessible
        if(md5_file($this['url']) == $this->ref('file_metadata')['md5']){
            $this['status'] = 'verified';
            $this->save();
            return true;
        }
        return false;
    }

    /**
     * Retrieve file and store in local file
     */
    function getFile(){
        if($this->local_copy)return $this->local_copy;
        return $this->local_copy = $this->storage->get($this);
    }

    function beforeDelete(){
        if($this->loaded()){
            $this->storage->delete($this);
        }
    }

    function __destruct(){
        if($this->local_copy)@unlink($this->local_copy);
    }

    function afterUnload(){
        if($this->local_copy)@unlink($this->local_copy);
        $this->local_copy=null;
    }
}
/*
class Model_File extends filestore\Model_File {
    public $table = 'filestore_file';
    public $title_field = 's3_url';
    function init()
    {
        parent::init();

        //$this->addField('original_filename');
        //$this->addField('filesize');


        $this->addField('s3_url');
        $this->addField('s3_thumb_url');
    }
    function getURLExpr($m,$q){
        $e = parent::getURLExpr($m,$q);
        return $q->expr('coalesce([0],[1])', [$this->getElement('s3_url'), $e]);
    }
}
*/