<?php
/**
 * Content component: FileDownload
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage content
 */

/**
 * Load base class
 */
WBClass::load('WBContent'
            ,'WBCache');

/**
 * Content component: FileDownload
 *
 * @version 0.1.2
 * @package WB
 * @subpackage content
 */
class WBContent_FileDownload extends WBContent
{
   /**
    * my parameter list
    * @var array
    */
    protected $config = array(
            'tmpl'      =>  'list',
            'dir'       =>  'download',
            'ttl'       =>  600
        );

   /**
    * run
    *
    * run component
    *
    * @return array parameter list
    */
    public function run()
    {
        $path   =   WBParam::get('wb/dir/base') . '/' . $this->config['dir'];
        $cache  =   __CLASS__ . ':path:' . $path;
        $files  =    WBCache::get($cache);
        if (!$files) {
            $files  =   $this->scanDir($path);
            WBCache::set($cache, $files, array('ttl' => $this->config['ttl']));
        }
        
        // download file
        $file   =   $this->req->get('file');
        if (!empty($file)) {
            foreach ($files as $f) {
                if ($file == $f['name']) {
                    $this->download($f);
                    break;
                }
            }
        }
        
        $this->loadTemplates($this->config['tmpl']);
        $this->tmpl->addRows('list_entry', $files);
        return $this->config;
    }

   /**
    * receive output
    *
    * fetch output of this content component
    *
    * @return string
    */
    public function getString()
    {
        return $this->tmpl->getParsedTemplate('snippet');
    }
    
    /**
     * find all files in download folder
     * 
     * 
     * @param string $path
     * @return array $files 
     */
    protected function scanDir($path)
    {
        $files  =   array();
        $dir    =   new DirectoryIterator($path);        
        foreach ($dir as $entry) {
            if (!$entry->isFile()) {
                continue;
            }
            
            $files[]    =   array(
                                'name'      =>  $entry->getFilename(),
                                'path'      =>  $entry->getPathname(),
                                'size'      =>  $entry->getSize(),
                                'changed'   =>  $entry->getMTime(),
                                'md5'       =>  md5_file($entry->getPathname()),  
                            );                    
        }
        
        usort($files, array($this, 'compareFile'));
        return $files;
    }
    
    /**
     * compare file names
     * 
     * Callback function for usort
     * 
     * @see usort()
     * @param array $a
     * @param array $b
     * @return int 
     */
    protected function compareFile($a, $b)
    {
        if ($a['name'] == $b['name']) {
            return 0;
        }
        if ($a['name'] < $b['name']) {
            return -1;
        }
        return 1;
    }
    
    /**
     * Download file
     * 
     * CAUTION: This method usually does not return! 
     * If file exists, it will send file to browser and exit programme!
     * 
     * @param array $file
     */
    protected function download($file)
    {
        if (!file_exists($file['path'])) {
            return;
        }

        // switch off compression - otherwise complete download files are loaded to RAM
        WBParam::set('wb/response/compress', 0);
        
        $res  =   WBClass::create('WBResponse');
        /** @var $res WBResponse */
        $res->addStream(fopen($file['path'], 'r'), $file['md5']);
        
        $res->addHeader('Content-Type', 'application/octest-stream');
        $res->addHeader('Content-Disposition', 'filename="' .  $file['name']. '"');
        $res->send($this->req);
        exit(0);
    }
}
?>