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Created: Sat, Feb 1, 6:28 AM

subscription_manager.php
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	<?php
	/**
	* @version $Id: subscription_manager.php 15287 2012-04-11 08:50:20Z alex $
	* @package In-Portal
	* @copyright Copyright (C) 1997 - 2012 Intechnic. All rights reserved.
	* @license GNU/GPL
	* In-Portal is Open Source software.
	* This means that this software may have been modified pursuant
	* the GNU General Public License, and as distributed it includes
	* or is derivative of works licensed under the GNU General Public License
	* or other free or open source software licenses.
	* See http://www.in-portal.org/license for copyright notices and details.
	*/

	defined('FULL_PATH') or die('restricted access!');

	class kSubscriptionManager extends kBase {

	/**
	* List of subscriptions (instances of kSubcriptionItem objects)
	*
	* @var Array
	* @access protected
	*/
	protected $subscriptions = Array ();

	/**
	* Adds set of fields, that uniquely identifies subscription
	*
	* @param Array $fields
	* @return void
	*/
	public function add($fields)
	{
	$this->subscriptions[] = new kSubscriptionItem($fields);
	}

	/**
	* Detects if current user is subscribed to new posts in given topic
	*
	* @return bool
	* @access public
	*/
	public function subscribed()
	{
	foreach ($this->subscriptions as $subscription) {
	if ( !$subscription->getSubscription()->isLoaded() ) {
	/* @var $subscription kSubscriptionItem */

	return false;
	}
	}

	return true;
	}

	/**
	* Subscribes current user to new posts in a given topic
	*
	* @return bool
	* @access public
	*/
	public function subscribe()
	{
	foreach ($this->subscriptions as $subscription) {
	if ( !$subscription->subscribe() ) {
	/* @var $subscription kSubscriptionItem */

	return false;
	}
	}

	return true;
	}

	/**
	* Unsubscribes current user from reciving e-mails about new posts in a gvein topic
	*
	* @return bool
	* @access public
	*/
	public function unsubscribe()
	{
	foreach ($this->subscriptions as $subscription) {
	if ( !$subscription->unsubscribe() ) {
	/* @var $subscription kSubscriptionItem */

	return false;
	}
	}

	return true;
	}

	/**
	* Returns e-mail event id or throws an exception, when such event not found
	*
	* @param string $email_event_name
	* @param int $type
	* @return string
	* @throws Exception
	* @access public
	*/
	public function getEmailEventId($email_event_name, $type = EmailEvent::EVENT_TYPE_FRONTEND)
	{
	$sql = 'SELECT EventId
	FROM ' . TABLE_PREFIX . 'EmailEvents
	WHERE Event = ' . $this->Conn->qstr($email_event_name) . ' AND Type = ' . $type;
	$id = $this->Conn->GetOne($sql);

	if ( !$id ) {
	throw new Exception('E-mail event "' . $email_event_name . '" not found');
	}

	return $id;
	}
	}


	class kSubscriptionItem extends kBase {

	/**
	* Fields set, that uniquely identifies subscription
	*
	* @var Array
	* @access protected
	*/
	protected $fields = Array ();

	/**
	* Creates new subscription item
	*
	* @param Array $fields
	* @access public
	*/
	public function __construct($fields)
	{
	parent::__construct();

	$this->fields = $fields;
	}

	/**
	* Returns user subscription
	*
	* @param bool $reload
	* @return kBase\|kDBItem
	* @access public
	*/
	public function getSubscription($reload = false)
	{
	$special = kUtil::crc32(serialize($this->fields));

	$subscription = $this->Application->recallObject('system-event-subscription.' . $special, null, Array ('skip_autoload' => true));
	/* @var $subscription kDBItem */

	if ( !$subscription->isLoaded() \|\| $reload ) {
	$subscription->Load($this->fields);
	}

	return $subscription;
	}

	/**
	* Subscribes user
	*
	* @return bool
	* @access public
	*/
	public function subscribe()
	{
	$subscription = $this->getSubscription();

	if ( $subscription->isLoaded() ) {
	return true;
	}

	$subscription->SetDBFieldsFromHash($this->fields);

	return $subscription->Create();
	}

	/**
	* Unsubscribes user
	*
	* @return bool
	* @access public
	*/
	public function unsubscribe()
	{
	$subscription = $this->getSubscription();

	if ( !$subscription->isLoaded() ) {
	return true;
	}

	$temp_handler = $this->Application->recallObject($subscription->getPrefixSpecial() . '_TempHandler', 'kTempTablesHandler');
	/* @var $temp_handler kTempTablesHandler */

	$temp_handler->DeleteItems($subscription->Prefix, $subscription->Special, Array ($subscription->GetID()));

	return true;
	}
	}

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