<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * 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@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_View

 * @subpackage Helper

 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Sitemap.php 25239 2013-01-22 09:45:01Z frosch $

 */

/**

 * @see Zend_View_Helper_Navigation_HelperAbstract

 */

require_once 'Zend/View/Helper/Navigation/HelperAbstract.php';

/**

 * Helper for printing sitemaps

 *

 * @link http://www.sitemaps.org/protocol.php

 *

 * @category   Zend

 * @package    Zend_View

 * @subpackage Helper

 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_View_Helper_Navigation_Sitemap

    extends Zend_View_Helper_Navigation_HelperAbstract

{

    /**

     * Namespace for the <urlset> tag

     *

     * @var string

     */

    const SITEMAP_NS = 'http://www.sitemaps.org/schemas/sitemap/0.9';

    /**

     * Schema URL

     *

     * @var string

     */

    const SITEMAP_XSD = 'http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd';

    /**

     * Whether the XML declaration should be included in XML output

     *

     * @var bool

     */

    protected $_useXmlDeclaration = true;

    /**

     * Whether sitemap should be validated using Zend_Validate_Sitemap_*

     *

     * @var bool

     */

    protected $_useSitemapValidators = true;

    /**

     * Whether sitemap should be schema validated when generated

     *

     * @var bool

     */

    protected $_useSchemaValidation = false;

    /**

     * Server url

     *

     * @var string

     */

    protected $_serverUrl;

    /**

     * View helper entry point:

     * Retrieves helper and optionally sets container to operate on

     *

     * @param  Zend_Navigation_Container $container  [optional] container to

     *                                               operate on

     * @return Zend_View_Helper_Navigation_Sitemap   fluent interface, returns

     *                                               self

     */

    public function sitemap(Zend_Navigation_Container $container = null)

    {

        if (null !== $container) {

            $this->setContainer($container);

        }

        return $this;

    }

    // Accessors:

    /**

     * Sets whether the XML declaration should be used in output

     *

     * @param  bool $useXmlDecl                     whether XML delcaration

     *                                              should be rendered

     * @return Zend_View_Helper_Navigation_Sitemap  fluent interface, returns

     *                                              self

     */

    public function setUseXmlDeclaration($useXmlDecl)

    {

        $this->_useXmlDeclaration = (bool) $useXmlDecl;

        return $this;

    }

    /**

     * Returns whether the XML declaration should be used in output

     *

     * @return bool  whether the XML declaration should be used in output

     */

    public function getUseXmlDeclaration()

    {

        return $this->_useXmlDeclaration;

    }

    /**

     * Sets whether sitemap should be validated using Zend_Validate_Sitemap_*

     *

     * @param  bool $useSitemapValidators           whether sitemap validators

     *                                              should be used

     * @return Zend_View_Helper_Navigation_Sitemap  fluent interface, returns

     *                                              self

     */

    public function setUseSitemapValidators($useSitemapValidators)

    {

        $this->_useSitemapValidators = (bool) $useSitemapValidators;

        return $this;

    }

    /**

     * Returns whether sitemap should be validated using Zend_Validate_Sitemap_*

     *

     * @return bool  whether sitemap should be validated using validators

     */

    public function getUseSitemapValidators()

    {

        return $this->_useSitemapValidators;

    }

    /**

     * Sets whether sitemap should be schema validated when generated

     *

     * @param  bool $schemaValidation               whether sitemap should

     *                                              validated using XSD Schema

     * @return Zend_View_Helper_Navigation_Sitemap  fluent interface, returns

     *                                              self

     */

    public function setUseSchemaValidation($schemaValidation)

    {

        $this->_useSchemaValidation = (bool) $schemaValidation;

        return $this;

    }

    /**

     * Returns true if sitemap should be schema validated when generated

     *

     * @return bool

     */

    public function getUseSchemaValidation()

    {

        return $this->_useSchemaValidation;

    }

    /**

     * Sets server url (scheme and host-related stuff without request URI)

     *

     * E.g. http://www.example.com

     *

     * @param  string $serverUrl                    server URL to set (only

     *                                              scheme and host)

     * @throws Zend_Uri_Exception                   if invalid server URL

     * @return Zend_View_Helper_Navigation_Sitemap  fluent interface, returns

     *                                              self

     */

    public function setServerUrl($serverUrl)

    {

        require_once 'Zend/Uri.php';

        $uri = Zend_Uri::factory($serverUrl);

        $uri->setFragment('');

        $uri->setPath('');

        $uri->setQuery('');

        if ($uri->valid()) {

            $this->_serverUrl = $uri->getUri();

        } else {

            require_once 'Zend/Uri/Exception.php';

            $e = new Zend_Uri_Exception(sprintf(

                    'Invalid server URL: "%s"',

                    $serverUrl));

            $e->setView($this->view);

            throw $e;

        }

        return $this;

    }

    /**

     * Returns server URL

     *

     * @return string  server URL

     */

    public function getServerUrl()

    {

        if (!isset($this->_serverUrl)) {

            $this->_serverUrl = $this->view->serverUrl();

        }

        return $this->_serverUrl;

    }

    // Helper methods:

    /**

     * Escapes string for XML usage

     *

     * @param  string $string  string to escape

     * @return string          escaped string

     */

    protected function _xmlEscape($string)

    {

        $enc = 'UTF-8';

        if ($this->view instanceof Zend_View_Interface

            && method_exists($this->view, 'getEncoding')

        ) {

            $enc = $this->view->getEncoding();

        }

        // do not encode existing HTML entities

        return htmlspecialchars($string, ENT_QUOTES, $enc, false);

    }

    // Public methods:

    /**

     * Returns an escaped absolute URL for the given page

     *

     * @param  Zend_Navigation_Page $page  page to get URL from

     * @return string

     */

    public function url(Zend_Navigation_Page $page)

    {

        $href = $page->getHref();

        if (!isset($href{0})) {

            // no href

            return '';

        } elseif ($href{0} == '/') {

            // href is relative to root; use serverUrl helper

            $url = $this->getServerUrl() . $href;

        } elseif (preg_match('/^[a-z]+:/im', (string) $href)) {

            // scheme is given in href; assume absolute URL already

            $url = (string) $href;

        } else {

            // href is relative to current document; use url helpers

            $url = $this->getServerUrl()

                 . rtrim($this->view->url(), '/') . '/'

                 . $href;

        }

        return $this->_xmlEscape($url);

    }

    /**

     * Returns a DOMDocument containing the Sitemap XML for the given container

     *

     * @param  Zend_Navigation_Container $container  [optional] container to get

     *                                               breadcrumbs from, defaults

     *                                               to what is registered in the

     *                                               helper

     * @return DOMDocument                           DOM representation of the

     *                                               container

     * @throws Zend_View_Exception                   if schema validation is on

     *                                               and the sitemap is invalid

     *                                               according to the sitemap

     *                                               schema, or if sitemap

     *                                               validators are used and the

     *                                               loc element fails validation

     */

    public function getDomSitemap(Zend_Navigation_Container $container = null)

    {

        if (null === $container) {

            $container = $this->getContainer();

        }

        // check if we should validate using our own validators

        if ($this->getUseSitemapValidators()) {

            require_once 'Zend/Validate/Sitemap/Changefreq.php';

            require_once 'Zend/Validate/Sitemap/Lastmod.php';

            require_once 'Zend/Validate/Sitemap/Loc.php';

            require_once 'Zend/Validate/Sitemap/Priority.php';

            // create validators

            $locValidator        = new Zend_Validate_Sitemap_Loc();

            $lastmodValidator    = new Zend_Validate_Sitemap_Lastmod();

            $changefreqValidator = new Zend_Validate_Sitemap_Changefreq();

            $priorityValidator   = new Zend_Validate_Sitemap_Priority();

        }

        // create document

        $dom = new DOMDocument('1.0', 'UTF-8');

        $dom->formatOutput = $this->getFormatOutput();

        // ...and urlset (root) element

        $urlSet = $dom->createElementNS(self::SITEMAP_NS, 'urlset');

        $dom->appendChild($urlSet);

        // create iterator

        $iterator = new RecursiveIteratorIterator($container,

            RecursiveIteratorIterator::SELF_FIRST);

        $maxDepth = $this->getMaxDepth();

        if (is_int($maxDepth)) {

            $iterator->setMaxDepth($maxDepth);

        }

        $minDepth = $this->getMinDepth();

        if (!is_int($minDepth) || $minDepth < 0) {

            $minDepth = 0;

        }

        // iterate container

        foreach ($iterator as $page) {

            if ($iterator->getDepth() < $minDepth || !$this->accept($page)) {

                // page should not be included

                continue;

            }

            // get absolute url from page

            if (!$url = $this->url($page)) {

                // skip page if it has no url (rare case)

                continue;

            }

            // create url node for this page

            $urlNode = $dom->createElementNS(self::SITEMAP_NS, 'url');

            $urlSet->appendChild($urlNode);

            if ($this->getUseSitemapValidators() &&

                !$locValidator->isValid($url)) {

                require_once 'Zend/View/Exception.php';

                $e = new Zend_View_Exception(sprintf(

                        'Encountered an invalid URL for Sitemap XML: "%s"',

                        $url));

                $e->setView($this->view);

                throw $e;

            }

            // put url in 'loc' element

            $urlNode->appendChild($dom->createElementNS(self::SITEMAP_NS,

                                                        'loc', $url));

            // add 'lastmod' element if a valid lastmod is set in page

            if (isset($page->lastmod)) {

                $lastmod = strtotime((string) $page->lastmod);

                // prevent 1970-01-01...

                if ($lastmod !== false) {

                    $lastmod = date('c', $lastmod);

                }

                if (!$this->getUseSitemapValidators() ||

                    $lastmodValidator->isValid($lastmod)) {

                    $urlNode->appendChild(

                        $dom->createElementNS(self::SITEMAP_NS, 'lastmod',

                                              $lastmod)

                    );

                }

            }

            // add 'changefreq' element if a valid changefreq is set in page

            if (isset($page->changefreq)) {

                $changefreq = $page->changefreq;

                if (!$this->getUseSitemapValidators() ||

                    $changefreqValidator->isValid($changefreq)) {

                    $urlNode->appendChild(

                        $dom->createElementNS(self::SITEMAP_NS, 'changefreq',

                                              $changefreq)

                    );

                }

            }

            // add 'priority' element if a valid priority is set in page

            if (isset($page->priority)) {

                $priority = $page->priority;

                if (!$this->getUseSitemapValidators() ||

                    $priorityValidator->isValid($priority)) {

                    $urlNode->appendChild(

                        $dom->createElementNS(self::SITEMAP_NS, 'priority',

                                              $priority)

                    );

                }

            }

        }

        // validate using schema if specified

        if ($this->getUseSchemaValidation()) {

            if (!@$dom->schemaValidate(self::SITEMAP_XSD)) {

                require_once 'Zend/View/Exception.php';

                $e = new Zend_View_Exception(sprintf(

                        'Sitemap is invalid according to XML Schema at "%s"',

                        self::SITEMAP_XSD));

                $e->setView($this->view);

                throw $e;

            }

        }

        return $dom;

    }

    // Zend_View_Helper_Navigation_Helper:

    /**

     * Renders helper

     *

     * Implements {@link Zend_View_Helper_Navigation_Helper::render()}.

     *

     * @param  Zend_Navigation_Container $container  [optional] container to

     *                                               render. Default is to

     *                                               render the container

     *                                               registered in the helper.

     * @return string                                helper output

     */

    public function render(Zend_Navigation_Container $container = null)

    {

        $dom = $this->getDomSitemap($container);

        $xml = $this->getUseXmlDeclaration() ?

               $dom->saveXML() :

               $dom->saveXML($dom->documentElement);

        return rtrim($xml, self::EOL);

    }

}