<?php

/**

 * Extends the 'kFileTransferMgr' class & implements a file transfer manager using the FTP protocol.

 * For additional comments please look at the 'kFileTransferMgr' class.

 * 

 * @package infra

 * @subpackage Storage

 */

class httpMgr extends kFileTransferMgr

{

	const HTTP_USER_AGENT = "\"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.6) Gecko/2009011913 Firefox/3.0.6\"";

	

	/**

	 * @var resource

	 */

	protected $ch;

	

	/**

	 * @var string

	 */

	protected $server;



	// instances of this class should be created usign the 'getInstance' of the 'kFileTransferMgr' class

	protected function __construct()

	{

		// do nothing

	}



	

	/**

	 * @param string $url

	 * @return string

	 */

	public static function encodeUrl($url)

	{

		return str_replace(array(' ', '[', ']'), array('%20', '%5B', '%5D'), $url);

	}



	/**********************************************************************/

	/* Implementation of abstract functions from class 'kFileTransferMgr' */

	/**********************************************************************/



	// ftp connect to server:port

	protected function doConnect($http_server, &$http_port)

	{

		// try connecting to server

		if (!$http_port || $http_port == 0)

			$http_port = 80;

			

		$http_server .= $http_server . ':' . $http_port;

		try

		{

			$url_parts = parse_url($http_server);

			if(isset($url_parts["scheme"]))

			{

				if($url_parts["scheme"] != "http" && $url_parts["scheme"] != "https" )

				{

					KalturaLog::err("URL [$http_server] is not http");

					return false;

				}

			}

			else

			{

				$http_server = 'http://' . $http_server;

			}

		}

		catch ( Exception $exception )

		{

			$http_server = 'http://' . $http_server;

		}

			

		$this->server = $http_server;



		$this->ch = curl_init();



		curl_setopt($this->ch, CURLOPT_USERAGENT, self::HTTP_USER_AGENT);

		curl_setopt($this->ch, CURLOPT_FOLLOWLOCATION, true);

		

		curl_setopt($this->ch, CURLOPT_NOSIGNAL, true);

		curl_setopt($this->ch, CURLOPT_FORBID_REUSE, true); 

		curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, true);

		

		curl_setopt($this->ch, CURLOPT_HEADER, false);

		curl_setopt($this->ch, CURLOPT_SSL_VERIFYPEER, false); 

		

		return $this->ch;

	}





	// login to an existing connection with given user/pass

	protected function doLogin($http_user, $http_pass, $ftp_passive_mode = true)

	{

		if(is_null($http_user) && is_null($http_pass))

			return true;

			

		curl_setopt($this->ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);

		curl_setopt($this->ch, CURLOPT_USERPWD, "{$http_user}:{$http_pass}");

		

		return true;

	}





	// login using a public key - not supported in FTP

	protected function doLoginPubKey($user, $pubKeyFile, $privKeyFile, $passphrase = null)

	{

		return false; // NOT SUPPORTED

	}





	// upload a file to the server (ftp_mode is irrelevant

	protected function doPutFile ($remote_file,  $local_file, $ftp_mode, $http_field_name = null, $http_file_name = null)

	{		

		$url = $this->server . '/' . $remote_file;

		$url = self::encodeUrl($url);

		

		curl_setopt($this->ch, CURLOPT_URL, $url);

		curl_setopt($this->ch, CURLOPT_POST, true);

		curl_setopt($this->ch, CURLOPT_RANGE, false);

		curl_setopt($this->ch, CURLOPT_HEADER, false);

		

		$params = null;

		if($http_field_name)

		{

			$params = array($http_field_name => file_get_contents($local_file));

		}

		elseif($http_file_name)

		{

			$params = array($http_file_name => '@' . $local_file);

		}

		else

		{

			$params = file_get_contents($local_file);

		}

		curl_setopt($this->ch, CURLOPT_POSTFIELDS, $params);

		

		$results = curl_exec($this->ch);

		if(!$results)

		{

			$errNumber = curl_errno($this->ch);

			$errDescription = curl_error($this->ch);

		

			if(!$results)

				throw new kFileTransferMgrException($errDescription, $errNumber);

		}

		

		return $results;

	}





	// download a file from the server (ftp_mode is irrelevant)

	protected function doGetFile ($remote_file, $local_file, $ftp_mode)

	{

		$url = $this->server . '/' . $remote_file;

		$url = self::encodeUrl($url);

		

		curl_setopt($this->ch, CURLOPT_URL, $url);

		curl_setopt($this->ch, CURLOPT_POST, false);

		curl_setopt($this->ch, CURLOPT_RANGE, false);

		curl_setopt($this->ch, CURLOPT_HEADER, false);

		

		$results = curl_exec($this->ch);

		if(!$results)

		{

			$errNumber = curl_errno($this->ch);

			$errDescription = curl_error($this->ch);

			throw new kFileTransferMgrException($errDescription, $errNumber);

		}

		

		if($local_file)

			file_put_contents($local_file, $results);

			

		return $results;

	}





	// create a new directory on the server

	protected function doMkDir ($remote_path)

	{

		return false;

	}





	// chmod to the given remote file

	protected function doChmod ($remote_file, $chmod_code)

	{

		return false;

	}





	// check if the given file/dir exists on the server

	protected function doFileExists($remote_file)

	{

		$url = $this->server . '/' . $remote_file;

		$url = self::encodeUrl($url);

		

		curl_setopt($this->ch, CURLOPT_URL, $url);

		curl_setopt($this->ch, CURLOPT_POST, false);

		curl_setopt($this->ch, CURLOPT_RANGE, '0-0');

		curl_setopt($this->ch, CURLOPT_HEADER, true);

		

		$results = curl_exec($this->ch);

		if(!$results)

		{

			curl_setopt($this->ch, CURLOPT_RANGE, false);

			curl_setopt($this->ch, CURLOPT_NOBODY, true);

			

			$results = curl_exec($this->ch);

		}



		if(!$results)

			return false;

			

		return true;

	}



	// return the current working directory

	protected function doPwd()

	{

		return '/';

	}



	// delete a file and return true/false according to success

	protected function doDelFile ($remote_file)

	{

		return false;

	}



	// delete a directory and return true/false according to success

	protected function doDelDir ($remote_path)

	{

		return false;

	}



	protected function doList ($remoteDir)

	{

		return false;

	}	



	/*******************/

	/* Other functions */

	/*******************/



	// closes the FTP connection.

	public function __destruct( )

	{

		// close the connection

		if ($this->ch)

			curl_close($this->ch);

	}



}