app/code/core/Mage/Customer/Helper/Data.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * 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@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Customer
 * @copyright  Copyright (c) 2009 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Customer Data Helper
 *
 * @category   Mage
 * @package    Mage_Customer
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Customer_Helper_Data extends Mage_Core_Helper_Abstract
{
    /**
     * Customer groups collection
     *
     * @var Mage_Customer_Model_Entity_Group_Collection
     */
    protected $_groups;

    /**
     * Check customer is logged in
     *
     * @return bool
     */
    public function isLoggedIn()
    {
        return Mage::getSingleton('customer/session')->isLoggedIn();
    }

    /**
     * Retrieve logged in customer
     *
     * @return Mage_Customer_Model_Customer
     */
    public function getCustomer()
    {
        if (empty($this->_customer)) {
            $this->_customer = Mage::getSingleton('customer/session')->getCustomer();
        }
        return $this->_customer;
    }

    /**
     * Retrieve customer groups collection
     *
     * @return Mage_Customer_Model_Entity_Group_Collection
     */
    public function getGroups()
    {
        if (empty($this->_groups)) {
            $this->_groups = Mage::getModel('customer/group')->getResourceCollection()
                ->setRealGroupsFilter()
                ->load();
        }
        return $this->_groups;
    }

    /**
     * Retrieve current (loggined) customer object
     *
     * @return Mage_Customer_Model_Customer
     */
    public function getCurrentCustomer()
    {
        return $this->getCustomer();
    }

    /**
     * Retrieve current customer name
     *
     * @return string
     */
    public function getCustomerName()
    {
        return $this->getCustomer()->getName();
    }

    /**
     * Check customer has address
     *
     * @return bool
     */
    public function customerHasAddresses()
    {
        return count($this->getCustomer()->getAddresses()) > 0;
    }

    /**************************************************************************
     * Customer urls
     */

    /**
     * Retrieve customer login url
     *
     * @return string
     */
    public function getLoginUrl()
    {
        return $this->_getUrl('customer/account/login');
    }

    /**
     * Retrieve customer login POST URL
     *
     * @return string
     */
    public function getLoginPostUrl()
    {
        return $this->_getUrl('customer/account/loginPost');
    }

    /**
     * Retrieve customer logout url
     *
     * @return string
     */
    public function getLogoutUrl()
    {
        return $this->_getUrl('customer/account/logout');
    }

    /**
     * Retrieve customer dashboard url
     *
     * @return string
     */
    public function getDashboardUrl()
    {
        return $this->_getUrl('customer/account');
    }

    /**
     * Retrieve customer account page url
     *
     * @return string
     */
    public function getAccountUrl()
    {
        return $this->_getUrl('customer/account');
    }

    /**
     * Retrieve customer register form url
     *
     * @return string
     */
    public function getRegisterUrl()
    {
        return $this->_getUrl('customer/account/create');
    }

    /**
     * Retrieve customer register form post url
     *
     * @return string
     */
    public function getRegisterPostUrl()
    {
        return $this->_getUrl('customer/account/createpost');
    }

    /**
     * Retrieve customer account edit form url
     *
     * @return string
     */
    public function getEditUrl()
    {
        return $this->_getUrl('customer/account/edit');
    }

    /**
     * Retrieve customer edit POST URL
     *
     * @return string
     */
    public function getEditPostUrl()
    {
        return $this->_getUrl('customer/account/editpost');
    }

    /**
     * Retrieve url of forgot password page
     *
     * @return string
     */
    public function getForgotPasswordUrl()
    {
        return $this->_getUrl('customer/account/forgotpassword');
    }

    /**
     * Check is confirmation required
     *
     * @return bool
     */
    public function isConfirmationRequired()
    {
        return $this->getCustomer()->isConfirmationRequired();
    }

    /**
     * Retrieve confirmation URL for Email
     *
     * @param string $email
     * @return string
     */
    public function getEmailConfirmationUrl($email = null)
    {
        return $this->_getUrl('customer/account/confirmation', array('email' => $email));
    }

    /**
     * Check whether customers registration is allowed
     *
     * @return bool
     */
    public function isRegistrationAllowed()
    {
        $result = new Varien_Object(array('is_allowed' => true));
        Mage::dispatchEvent('customer_registration_is_allowed', array('result' => $result));
        return $result->getIsAllowed();
    }
}

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