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<?php
/*
* 2007-2016 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Academic Free License (AFL 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/afl-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@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2016 PrestaShop SA
*  @license    http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

if (!defined('_PS_VERSION_')) {
    exit;
}

class PagesNotFound extends Module
{
    private $html = '';

    public function __construct()
    {
        $this->name = 'pagesnotfound';
        $this->tab = 'administration';
        $this->version = '2.0.3';
        $this->author = 'PrestaShop';
        $this->need_instance = 0;

        parent::__construct();

        $this->displayName = $this->trans('Pages not found', [], 'Modules.Pagesnotfound.Admin');
        $this->description = $this->trans('Enrich your stats, display the pages requested by your visitors that could not be found.', [], 'Modules.Pagesnotfound.Admin');
        $this->ps_versions_compliancy = ['min' => '1.7.1.0', 'max' => _PS_VERSION_];
    }

    public function install()
    {
        if (!parent::install()
            || !$this->registerHook('displayTop')
            || !$this->registerHook('displayAdminStatsModules')
        ) {
            return false;
        }

        return Db::getInstance()->execute(
            'CREATE TABLE `' . _DB_PREFIX_ . 'pagenotfound` (
			id_pagenotfound INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
			id_shop INTEGER UNSIGNED NOT NULL DEFAULT \'1\',
			id_shop_group INTEGER UNSIGNED NOT NULL DEFAULT \'1\',
			request_uri VARCHAR(256) NOT NULL,
			http_referer VARCHAR(256) NOT NULL,
			date_add DATETIME NOT NULL,
			PRIMARY KEY(id_pagenotfound),
			INDEX (`date_add`)
		) ENGINE=' . _MYSQL_ENGINE_ . ' DEFAULT CHARSET=utf8;'
        );
    }

    public function uninstall()
    {
        return parent::uninstall() && Db::getInstance()->execute('DROP TABLE `' . _DB_PREFIX_ . 'pagenotfound`');
    }

    private function getPages()
    {
        $sql = 'SELECT http_referer, request_uri, COUNT(*) as nb
				FROM `' . _DB_PREFIX_ . 'pagenotfound`
				WHERE date_add BETWEEN ' . ModuleGraph::getDateBetween()
            . Shop::addSqlRestriction() .
            'GROUP BY http_referer, request_uri';
        $result = Db::getInstance((bool) _PS_USE_SQL_SLAVE_)->executeS($sql);

        $pages = [];
        foreach ($result as $row) {
            $row['http_referer'] = parse_url($row['http_referer'], PHP_URL_HOST) . parse_url($row['http_referer'], PHP_URL_PATH);
            if (!isset($row['http_referer']) || empty($row['http_referer'])) {
                $row['http_referer'] = '--';
            }
            if (!isset($pages[$row['request_uri']])) {
                $pages[$row['request_uri']] = ['nb' => 0];
            }
            $pages[$row['request_uri']][$row['http_referer']] = $row['nb'];
            $pages[$row['request_uri']]['nb'] += $row['nb'];
        }
        uasort($pages, 'pnfSort');

        return $pages;
    }

    public function hookDisplayAdminStatsModules()
    {
        $this->context->controller->addCSS($this->_path . 'views/css/stacking_responsive.css');

        if (Tools::isSubmit('submitTruncatePNF')) {
            Db::getInstance()->execute('TRUNCATE `' . _DB_PREFIX_ . 'pagenotfound`');
            $this->html .= '<div class="alert alert-warning"> ' . $this->trans('The "pages not found" cache has been emptied.', [], 'Modules.Pagesnotfound.Admin') . '</div>';
        } elseif (Tools::isSubmit('submitDeletePNF')) {
            Db::getInstance()->execute(
                'DELETE FROM `' . _DB_PREFIX_ . 'pagenotfound`
				WHERE date_add BETWEEN ' . ModuleGraph::getDateBetween()
            );
            $this->html .= '<div class="alert alert-warning"> ' . $this->trans('The "pages not found" cache has been deleted.', [], 'Modules.Pagesnotfound.Admin') . '</div>';
        }

        $this->html .= '
			<div class="panel-heading">
				' . $this->displayName . '
			</div>
			<h4>' . $this->trans('Guide', [], 'Modules.Pagesnotfound.Admin') . '</h4>
			<div class="alert alert-warning">
				<h4>' . $this->trans('404 errors', [], 'Modules.Pagesnotfound.Admin') . '</h4>
				<p>'
            . $this->trans('A 404 error is an HTTP error code which means that the file requested by the user cannot be found. In your case it means that one of your visitors entered a wrong URL in the address bar, or that you or another website has a dead link. When possible, the referrer is shown so you can find the page/site which contains the dead link. If not, it generally means that it is a direct access, so someone may have bookmarked a link which doesn\'t exist anymore.', [], 'Modules.Pagesnotfound.Admin') . '
				</p>
				<p>&nbsp;</p>
				<h4>' . $this->trans('How to catch these errors?', [], 'Modules.Pagesnotfound.Admin') . '</h4>
				<p>'
            . sprintf($this->trans('If your webhost supports .htaccess files, you can create one in the root directory of PrestaShop and insert the following line inside: "%s".', [], 'Modules.Pagesnotfound.Admin'), 'ErrorDocument 404 ' . __PS_BASE_URI__ . '404.php') . '<br />' .
            sprintf($this->trans('A user requesting a page which doesn\'t exist will be redirected to the following page: %s. This module logs access to this page.', [], 'Modules.Pagesnotfound.Admin'), __PS_BASE_URI__ . '404.php') . '
				</p>
			</div>';
        if (!file_exists($this->_normalizeDirectory(_PS_ROOT_DIR_) . '.htaccess')) {
            $this->html .= '<div class="alert alert-warning">' . $this->trans('You must use a .htaccess file to redirect 404 errors to the "404.php" page.', [], 'Modules.Pagesnotfound.Admin') . '</div>';
        }

        $pages = $this->getPages();
        if (count($pages)) {
            $titlePage = $this->trans('Page', [], 'Modules.Pagesnotfound.Admin');
            $titleReferer = $this->trans('Referrer', [], 'Modules.Pagesnotfound.Admin');
            $titleCounter = $this->trans('Counter', [], 'Modules.Pagesnotfound.Admin');

            $this->html .= '
            <div class="stacking__wrapper">
            <table class="table">
               	<thead>
                    <tr>
                        <th scope="row"></th>
                        <th scope="col"><span class="title_box active">' . $titlePage . '</span></th>
                        <th scope="col"><span class="title_box active">' . $titleReferer . '</span></th>
                        <th scope="col"><span class="title_box active">' . $titleCounter . '</span></th>
                    </tr>
                </thead>
                <tbody>';
            foreach ($pages as $ru => $hrs) {
                foreach ($hrs as $hr => $counter) {
                    if ($hr != 'nb') {
                        $this->html .= '
                        <tr>
                            <th scope="row"></th>
                            <td data-header="' . $titlePage . '"><a href="' . $ru . '-admin404">' . wordwrap($ru, 30, '<br />', true) . '</a></td>
                            <td data-header="' . $titleReferer . '"><a href="' . Tools::getProtocol() . $hr . '">' . wordwrap($hr, 40, '<br />', true) . '</a></td>
                            <td data-header="' . $titleCounter . '"><span>' . $counter . '</span></td>
                        </tr>';
                    }
                }
            }
            $this->html .= '
            	</tbody>
            </table>
            </div>';
        } else {
            $this->html .= '<div class="alert alert-warning"> ' . $this->trans('No "page not found" issue registered for now.', [], 'Modules.Pagesnotfound.Admin') . '</div>';
        }

        if (count($pages)) {
            $this->html .= '
				<h4>' . $this->trans('Empty database', [], 'Modules.Pagesnotfound.Admin') . '</h4>
				<form action="' . Tools::htmlEntitiesUtf8($_SERVER['REQUEST_URI']) . '" method="post">
					<button type="submit" class="btn btn-default" name="submitDeletePNF">
						<i class="icon-remove"></i> ' . $this->trans('Empty ALL "pages not found" notices for this period', [], 'Modules.Pagesnotfound.Admin') . '
					</button>
					<button type="submit" class="btn btn-default" name="submitTruncatePNF">
						<i class="icon-remove"></i> ' . $this->trans('Empty ALL "pages not found" notices', [], 'Modules.Pagesnotfound.Admin') . '
					</button>
				</form>';
        }

        return $this->html;
    }

    public function hookDisplayTop($params)
    {
        if (strstr($_SERVER['REQUEST_URI'], '404.php') && isset($_SERVER['REDIRECT_URL'])) {
            $_SERVER['REQUEST_URI'] = $_SERVER['REDIRECT_URL'];
        }
        if (!Validate::isUrl($request_uri = $_SERVER['REQUEST_URI']) || strstr($_SERVER['REQUEST_URI'], '-admin404')) {
            return;
        }

        if (get_class(Context::getContext()->controller) == 'PageNotFoundController') {
            $http_referer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '';
            if (empty($http_referer) || Validate::isAbsoluteUrl($http_referer)) {
                Db::getInstance()->execute(
                    '
		    INSERT INTO `' . _DB_PREFIX_ . 'pagenotfound` (`request_uri`, `http_referer`, `date_add`, `id_shop`, `id_shop_group`)
		    VALUES (\'' . pSQL($request_uri) . '\', \'' . pSQL($http_referer) . '\', NOW(), ' . (int) $this->context->shop->id . ', ' . (int) $this->context->shop->id_shop_group . ')
		    '
                );
            }
        }
    }

    private function _normalizeDirectory($directory)
    {
        $last = $directory[strlen($directory) - 1];

        if (in_array($last, ['/', '\\'])) {
            $directory[strlen($directory) - 1] = DIRECTORY_SEPARATOR;

            return $directory;
        }

        $directory .= DIRECTORY_SEPARATOR;

        return $directory;
    }
}

function pnfSort($a, $b)
{
    if ($a['nb'] == $b['nb']) {
        return 0;
    }

    return ($a['nb'] > $b['nb']) ? -1 : 1;
}

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