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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_TimeSync
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @version $Id: TimeSync.php 16207 2009-06-21 19:17:51Z thomas $
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/**
* Zend_Date
*/
require_once 'Zend/Date.php';
/**
* @category Zend
* @package Zend_TimeSync
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_TimeSync implements IteratorAggregate
{
/**
* Set the default timeserver protocol to "Ntp". This will be called
* when no protocol is specified
*/
const DEFAULT_PROTOCOL = 'Ntp';
/**
* Contains array of timeserver objects
*
* @var array
*/
protected $_timeservers = array();
/**
* Holds a reference to the timeserver that is currently being used
*
* @var object
*/
protected $_current;
/**
* Allowed timeserver schemes
*
* @var array
*/
protected $_allowedSchemes = array(
'Ntp',
'Sntp'
);
/**
* Configuration array, set using the constructor or using
* ::setOptions() or ::setOption()
*
* @var array
*/
public static $options = array(
'timeout' => 1
);
/**
* Zend_TimeSync constructor
*
* @param string|array $target - OPTIONAL single timeserver, or an array of timeservers.
* @param string $alias - OPTIONAL an alias for this timeserver
* @return object
*/
public function __construct($target = null, $alias = null)
{
if ($target !== null) {
$this->addServer($target, $alias);
}
}
/**
* getIterator() - return an iteratable object for use in foreach and the like,
* this completes the IteratorAggregate interface
*
* @return ArrayObject
*/
public function getIterator()
{
return new ArrayObject($this->_timeservers);
}
/**
* Add a timeserver or multiple timeservers
*
* Server should be a single string representation of a timeserver,
* or a structured array listing multiple timeservers.
*
* If you provide an array of timeservers in the $target variable,
* $alias will be ignored. you can enter these as the array key
* in the provided array, which should be structured as follows:
*
* <code>
* $example = array(
* 'server_a' => 'ntp://127.0.0.1',
* 'server_b' => 'ntp://127.0.0.1:123',
* 'server_c' => 'ntp://[2000:364:234::2.5]',
* 'server_d' => 'ntp://[2000:364:234::2.5]:123'
* );
* </code>
*
* If no port number has been suplied, the default matching port
* number will be used.
*
* Supported protocols are:
* - ntp
* - sntp
*
* @param string|array $target - Single timeserver, or an array of timeservers.
* @param string $alias - OPTIONAL an alias for this timeserver
* @throws Zend_TimeSync_Exception
*/
public function addServer($target, $alias = null)
{
if (is_array($target)) {
foreach ($target as $key => $server) {
$this->_addServer($server, $key);
}
} else {
$this->_addServer($target, $alias);
}
}
/**
* Sets the value for the given options
*
* This will replace any currently defined options.
*
* @param array $options - An array of options to be set
*/
public static function setOptions(array $options)
{
foreach ($options as $key => $value) {
Zend_TimeSync::$options[$key] = $value;
}
}
/**
* Marks a nameserver as current
*
* @param string|integer $alias - The alias from the timeserver to set as current
* @throws Zend_TimeSync_Exception
*/
public function setServer($alias)
{
if (isset($this->_timeservers[$alias]) === true) {
$this->_current = $this->_timeservers[$alias];
} else {
require_once 'Zend/TimeSync/Exception.php';
throw new Zend_TimeSync_Exception("'$alias' does not point to valid timeserver");
}
}
/**
* Returns the value to the option
*
* @param string $key - The option's identifier
* @return mixed
* @throws Zend_TimeSync_Exception
*/
public static function getOptions($key = null)
{
if ($key == null) {
return Zend_TimeSync::$options;
}
if (isset(Zend_TimeSync::$options[$key]) === true) {
return Zend_TimeSync::$options[$key];
} else {
require_once 'Zend/TimeSync/Exception.php';
throw new Zend_TimeSync_Exception("'$key' does not point to valid option");
}
}
/**
* Return a specified timeserver by alias
* If no alias is given it will return the current timeserver
*
* @param string|integer $alias - The alias from the timeserver to return
* @return object
* @throws Zend_TimeSync_Exception
*/
public function getServer($alias = null)
{
if ($alias === null) {
if (isset($this->_current) && $this->_current !== false) {
return $this->_current;
} else {
require_once 'Zend/TimeSync/Exception.php';
throw new Zend_TimeSync_Exception('there is no timeserver set');
}
}
if (isset($this->_timeservers[$alias]) === true) {
return $this->_timeservers[$alias];
} else {
require_once 'Zend/TimeSync/Exception.php';
throw new Zend_TimeSync_Exception("'$alias' does not point to valid timeserver");
}
}
/**
* Returns information sent/returned from the current timeserver
*
* @return array
*/
public function getInfo()
{
return $this->getServer()->getInfo();
}
/**
* Query the timeserver list using the fallback mechanism
*
* If there are multiple servers listed, this method will act as a
* facade and will try to return the date from the first server that
* returns a valid result.
*
* @param $locale - OPTIONAL locale
* @return object
* @throws Zend_TimeSync_Exception
*/
public function getDate($locale = null)
{
require_once 'Zend/TimeSync/Exception.php';
foreach ($this->_timeservers as $alias => $server) {
$this->_current = $server;
try {
return $server->getDate($locale);
} catch (Zend_TimeSync_Exception $e) {
if (!isset($masterException)) {
$masterException = new Zend_TimeSync_Exception('all timeservers are bogus');
}
$masterException->addException($e);
}
}
throw $masterException;
}
/**
* Adds a timeserver object to the timeserver list
*
* @param string|array $target - Single timeserver, or an array of timeservers.
* @param string $alias - An alias for this timeserver
*/
protected function _addServer($target, $alias)
{
if ($pos = strpos($target, '://')) {
$protocol = substr($target, 0, $pos);
$adress = substr($target, $pos + 3);
} else {
$adress = $target;
$protocol = self::DEFAULT_PROTOCOL;
}
if ($pos = strrpos($adress, ':')) {
$posbr = strpos($adress, ']');
if ($posbr and ($pos > $posbr)) {
$port = substr($adress, $pos + 1);
$adress = substr($adress, 0, $pos);
} else if (!$posbr and $pos) {
$port = substr($adress, $pos + 1);
$adress = substr($adress, 0, $pos);
} else {
$port = null;
}
} else {
$port = null;
}
$protocol = ucfirst(strtolower($protocol));
if (!in_array($protocol, $this->_allowedSchemes)) {
require_once 'Zend/TimeSync/Exception.php';
throw new Zend_TimeSync_Exception("'$protocol' is not a supported protocol");
}
$className = 'Zend_TimeSync_' . $protocol;
if (!class_exists($className)) {
require_once 'Zend/Loader.php';
Zend_Loader::loadClass($className);
}
$timeServerObj = new $className($adress, $port);
$this->_timeservers[$alias] = $timeServerObj;
}
}
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