app/code/core/Mage/Customer/Block/Form/Login.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) 2008 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 login form block
 *
 * @category   Mage
 * @package    Mage_Customer
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Customer_Block_Form_Login extends Mage_Core_Block_Template
{
    private $_username = -1;

    protected function _prepareLayout()
    {
        $this->getLayout()->getBlock('head')->setTitle(Mage::helper('customer')->__('Customer Login'));
        return parent::_prepareLayout();
    }

    /**
     * Retrieve form posting url
     *
     * @return string
     */
    public function getPostActionUrl()
    {
        return $this->helper('customer')->getLoginPostUrl();
    }

    /**
     * Retrieve create new account url
     *
     * @return string
     */
    public function getCreateAccountUrl()
    {
        $url = $this->getData('create_account_url');
        if (is_null($url)) {
            $url = $this->helper('customer')->getRegisterUrl();
        }
        return $url;
    }

    /**
     * Retrieve password forgotten url
     *
     * @return string
     */
    public function getForgotPasswordUrl()
    {
        return $this->helper('customer')->getForgotPasswordUrl();
    }

    /**
     * Retrieve username for form field
     *
     * @return string
     */
    public function getUsername()
    {
        if (-1 === $this->_username) {
            $this->_username = Mage::getSingleton('customer/session')->getUsername(true);
        }
        return $this->_username;
    }
}

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