Joomla-Sermon-Distributor/site/controllers/download.php

<?php
/*-------------------------------------------------------------------------------------------------------------|  www.vdm.io  |------/
 ____                                                  ____                 __               __               __
/\  _`\                                               /\  _`\   __         /\ \__         __/\ \             /\ \__
\ \,\L\_\     __   _ __    ___ ___     ___     ___    \ \ \/\ \/\_\    ____\ \ ,_\  _ __ /\_\ \ \____  __  __\ \ ,_\   ___   _ __
 \/_\__ \   /'__`\/\`'__\/' __` __`\  / __`\ /' _ `\   \ \ \ \ \/\ \  /',__\\ \ \/ /\`'__\/\ \ \ '__`\/\ \/\ \\ \ \/  / __`\/\`'__\
   /\ \L\ \/\  __/\ \ \/ /\ \/\ \/\ \/\ \L\ \/\ \/\ \   \ \ \_\ \ \ \/\__, `\\ \ \_\ \ \/ \ \ \ \ \L\ \ \ \_\ \\ \ \_/\ \L\ \ \ \/
   \ `\____\ \____\\ \_\ \ \_\ \_\ \_\ \____/\ \_\ \_\   \ \____/\ \_\/\____/ \ \__\\ \_\  \ \_\ \_,__/\ \____/ \ \__\ \____/\ \_\
    \/_____/\/____/ \/_/  \/_/\/_/\/_/\/___/  \/_/\/_/    \/___/  \/_/\/___/   \/__/ \/_/   \/_/\/___/  \/___/   \/__/\/___/  \/_/

/------------------------------------------------------------------------------------------------------------------------------------/

	@version		2.1.x
	@created		22nd October, 2015
	@package		Sermon Distributor
	@subpackage		download.php
	@author			Llewellyn van der Merwe <https://www.vdm.io/>	
	@copyright		Copyright (C) 2015. All Rights Reserved
	@license		GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html 

	A sermon distributor that links to Dropbox. 

/----------------------------------------------------------------------------------------------------------------------------------*/

// No direct access to this file
defined('_JEXEC') or die('Restricted access');

// import Joomla controllerform library
jimport('joomla.application.component.controller');

/**
 * Sermondistributor Download Controller
 */
class SermondistributorControllerDownload extends JControllerLegacy
{
	
	public function __construct($config)
	{
		parent::__construct($config);
		// load the tasks 
		$this->registerTask('file', 'download');
	}
	
	public function download()
	{
		$jinput 	= JFactory::getApplication()->input;
		// Check Token!
		$token 		= JSession::getFormToken();
		$call_token	= $jinput->get('token', 0, 'ALNUM');
		if($token == $call_token)
		{
			$task = $this->getTask();
			switch($task)
			{
				case 'file':
					$keys = SermondistributorHelper::base64_urldecode($jinput->get('key', NULL, 'STRING'));
					$enUrl = SermondistributorHelper::base64_urldecode($jinput->get('link', NULL, 'STRING'));
					$infoKey = SermondistributorHelper::base64_urldecode($jinput->get('info', NULL, 'STRING'));
					$filename = $jinput->get('filename', NULL, 'CMD');
					if((base64_encode(base64_decode($enUrl, true)) === $enUrl) && (base64_encode(base64_decode($keys, true)) === $keys) && $filename)
					{
						// we must first count this download
						if (SermondistributorHelper::countDownload($keys,$filename))
						{
							// $model = SermondistributorHelper::getModel('preachers', JPATH_COMPONENT_ADMINISTRATOR);
							// if (($result = $model->getSomeStuff($filename)) !== false)
							// {
								// on success do some thing more (code  here)
							// }
							// get Site name
							$config = JFactory::getConfig();
							$vendor = $config->get('sitename');
							$name = SermondistributorHelper::safeString($filename, 'Ww');
							// Get local key
							$localkey = SermondistributorHelper::getLocalKey();
							$opener = new FOFEncryptAes($localkey, 128);
							$link = rtrim($opener->decryptString($enUrl), "\0");
							// check if we have local listing info
							if (!$info = SermondistributorHelper::getFileInfo($infoKey))
							{
								$info = $this->getContentInfo($link);
							}
							// set headers
							$app = JFactory::getApplication();
							$app->setHeader('Accept-ranges', 'bytes', true);
							$app->setHeader('Connection', 'keep-alive', true);
							$app->setHeader('Content-Encoding', 'none', true);
							$app->setHeader('Content-disposition', 'attachment; filename="'.$filename.'";', true);
							if (isset($info['type']) && $info['type'])
							{
								$app->setHeader('Content-Type', $info['type'], true);
							}
							elseif (strpos($filename, '.mp3') !== false)
							{
								$app->setHeader('Content-Type', 'audio/mpeg', true);
							}
							else
							{
								$app->setHeader('Content-Type', 'application/octet-stream', true);
							}
							// important to have the file size.
							if (isset($info['filesize']) && $info['filesize'])
							{
								$app->setHeader('Content-Length', (int) $info['filesize'], true);
								$app->setHeader('Content-Size', (int) $info['filesize'], true);	
							}
							$app->setHeader('Content-security-policy', 'referrer no-referrer', true);
							$app->setHeader('Content-Name', '"'.$name.'"', true);
							$app->setHeader('Content-Version', '1.0', true);
							$app->setHeader('Content-Vendor', '"'.$vendor.'"', true);
							$app->setHeader('Content-URL', '"'.JUri::getInstance().'"', true);
							$app->setHeader('etag', md5($enUrl), true);
							$app->setHeader('Pragma', 'public', true);
							$app->setHeader('cache-control', 'must-revalidate, post-check=0, pre-check=0', true);
							$app->setHeader('x-robots-tag', 'noindex, nofollow, noimageindex', true);
							$app->setHeader('x-content-security-policy', 'referrer no-referrer', true);
							$app->setHeader('x-webkit-csp', 'referrer no-referrer', true);
							$app->setHeader('x-content-security-policy', 'referrer no-referrer', true);
							// get the file
							readfile($link);
							$app->sendHeaders();
							$app->close();
							jexit();
						}
					}
				break;
			}
		}
		die('Restricted access');
	}
	
	protected function getContentInfo($url)
	{
		if ($this->_isCurl())
		{
			$ch = curl_init($url);
			curl_setopt($ch, CURLOPT_NOBODY, true);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			curl_setopt($ch, CURLOPT_HEADER, true);
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

			$data = curl_exec($ch);
			curl_close($ch);
		}
		else
		{
			// then we try getheaders (this is slower)
			stream_context_set_default( array('http' => array('method' => 'HEAD')));
			$headers = get_headers($url);
			if (SermondistributorHelper::checkArray($headers))
			{
				$data = implode("\n", $headers);
			}
		}
		// get the Content Length
		if (preg_match('/Content-Length: (\d+)/', $data, $matches))
		{
			// Contains file size in bytes
			$found['filesize'] = (int) $matches[1];

		}
		// get the Content Type
		if (preg_match_all('/Content-Type: (.+)/', $data, $matches))
		{
			foreach ($matches[1] as $match)
			{
				// not the html
				if (strpos( $match, 'text/html') === false)
				{
					$found['type'] =  $match;
					break;
				}
			}

		}
		// return found values
		if (isset($found) && SermondistributorHelper::checkArray($found))
		{
			return $found;
		}
		return false;
	}
	
	protected function _isCurl()
	{
		return function_exists('curl_version');
	}
}