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<?php
/**
 * X-Sendfile controller helper
 *
 * @copyright Copyright (c) 2008-2009 Pro Soft Resources USA Inc. (http://www.prosoftpeople.com) * @author    Rolando Espinoza La fuente (rho@prosoftpeople.com)
 * @license   http://www.opensource.org/licenses/bsd-license.php New BSD License
 * @version   $Id$
 */ 
 class Zend_Controller_Action_Helper_Xsendfile extends Zend_Controller_Action_Helper_Abstract
{
    /**
     * @var bool Use Nginx specific header
     */    protected $_isNginx = false;
 
    /**
     * @var bool Wheter to force download. Default true.
     */    protected $_forceDownload = true;
 
    /**
     * Send files through X-Sendfile feature
     *      * @param  string $path     File path.
     * @param  string $filename File name. Optional.
     * @return $this
     */
    public function xsendfile($path, $mime = null, $filename = null)    {
        // set filename if not given
        if (null === $filename) {
            $filename = basename($path);
        } 
        $response = $this->getResponse();
 
        // send mime info
        if (null !== $mime) {            $response->setHeader('Content-Type', $mime);
        }
 
        // send file as attachment
        if ($this->forceDownload()) {            $contentDisposition = 'attachment; filename=' . $filename;
        } else {
            $contentDisposition = 'inline; filename=' . $filename;
        }
         // if server is Nginx use different header
        if ($this->isNginx()) {
            $headerName = 'X-Accel-Redirect';
        } else {
            $headerName = 'X-Sendfile';        }
 
        // set response headers
        $response->setHeader('Content-Disposition', $contentDisposition)
                 ->setHeader($headerName, $path); 
        // Done. Webserver will send the file 
 
        return $this;
    } 
    /**
     * Force download flag
     * 
     * @param  boolean  Optional.      * @return boolean
     */
    public function forceDownload($flag = null)
    {
        if ($flag !== null) {            $this->_forceDownload = (bool) $flag;
        }
 
        return $this->_forceDownload;
    } 
    /**
     * Nginx web server flag
     *
     * TODO: Support internal paths     * 
     * @param  boolean  Optional. 
     * @return boolean
     */
    public function isNginx($flag = null)    {
        if ($flag !== null) {
            $this->_isNginx = (bool) $flag;
        }
         return $this->_isNginx;
    }
 
    /**
     * Direct pattern     * 
     * @param  string $path     File path.
     * @param  string $filename File name. Optional.
     * @return $this
    */    public function direct($path, $mime = null, $filename = null)
    {
        return $this->xsendfile($path, $mime, $filename);
    }
}