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