288 lines
7.3 KiB
PHP
288 lines
7.3 KiB
PHP
<?php
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/**
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* Initial implementation of Sitemap support.
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* GoogleSitemap should handle requests to 'sitemap.xml'
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* the other two classes are used to render the sitemap.
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*
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* You can notify ("ping") Google about a changed sitemap
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* automatically whenever a new page is published or unpublished.
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* By default, Google is not notified, and will pick up your new
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* sitemap whenever the GoogleBot visits your website.
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*
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* Enabling notification of Google after every publish (in your _config.php):
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*
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* <example>
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* GoogleSitemap::enable_google_notificaton();
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* </example>
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*
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* @see http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=34609
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*
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* @package googlesitemaps
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*/
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class GoogleSitemap extends Controller {
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/**
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* @var boolean
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*/
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protected static $enabled = true;
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/**
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* @var DataObjectSet
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*/
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protected $Pages;
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/**
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* @var boolean
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*/
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protected static $google_notification_enabled = false;
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/**
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* @var boolean
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*/
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protected static $use_show_in_search = true;
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/**
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* List of DataObjects to show in sitemap.xml
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*
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* @var array
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*/
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public static $google_sitemap_dataobjects = array();
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/**
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* List of DataObjects change frequency
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*
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* @var array
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*/
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public static $google_sitemap_dataobjects_changefreq = array();
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/**
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* Decorates the given DataObject with {@link GoogleSitemapDecorator}
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* and pushes the class name to the registered DataObjects.
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* Note that all registered DataObjects need the method AbsoluteLink().
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*
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* @param string $className name of DataObject to register
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* @param string $changeFreq
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*
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* @return void
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*/
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public static function register_dataobject($className, $changeFreq = 'monthly') {
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if (!self::is_registered($className)) {
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Object::add_extension($className, 'GoogleSitemapDecorator');
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self::$google_sitemap_dataobjects[] = $className;
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self::$google_sitemap_dataobjects_changefreq[] = $changeFreq;
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}
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}
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/**
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* Checks whether the given class name is already registered or not.
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*
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* @param string $className Name of DataObject to check
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*
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* @return bool
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*/
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public static function is_registered($className) {
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return in_array($className, self::$google_sitemap_dataobjects);
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}
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/**
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* Adds DataObjects to the existing DataObjectSet with pages from the
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* site tree
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*
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* @param DataObjectSet $newPages
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*
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* @return DataObjectSet
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*/
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protected function addRegisteredDataObjects() {
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$output = new DataObjectSet();
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foreach(self::$google_sitemap_dataobjects as $index => $className) {
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$dataObjectSet = DataObject::get($className);
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if($dataObjectSet) {
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foreach($dataObjectSet as $dataObject) {
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if($dataObject->canView() && (!isset($dataObject->Priority) || $dataObject->Priority > 0)) {
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$dataObject->ChangeFreq = self::$google_sitemap_dataobjects_changefreq[$index];
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if(!isset($dataObject->Priority)) {
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$dataObject->Priority = 1.0;
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}
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$output->push($dataObject);
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}
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}
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}
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}
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return $output;
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}
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/**
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* Returns all the links to {@link SiteTree} pages and
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* {@link DataObject} urls on the page
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*
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* @return DataObjectSet
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*/
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public function Items() {
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$filter = '';
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$bt = defined('DB::USE_ANSI_SQL') ? "\"" : "`";
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if(self::$use_show_in_search) {
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$filter = "{$bt}ShowInSearch{$bt} = 1";
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}
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$this->Pages = Versioned::get_by_stage('SiteTree', 'Live', $filter);
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$newPages = new DataObjectSet();
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if($this->Pages) {
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foreach($this->Pages as $page) {
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// Only include pages from this host and pages which are not an
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// instance of ErrorPage. We prefix $_SERVER['HTTP_HOST'] with
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// 'http://' so that parse_url to help parse_url identify the
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// host name component; we could use another protocol (like ftp
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// as the prefix and the code would work the same.
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$pageHttp = parse_url($page->AbsoluteLink(), PHP_URL_HOST);
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$hostHttp = parse_url('http://' . $_SERVER['HTTP_HOST'], PHP_URL_HOST);
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if(($pageHttp == $hostHttp) && !($page instanceof ErrorPage)) {
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// If the page has been set to 0 priority, we set a flag so
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// it won't be included
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if($page->canView() && (!isset($page->Priority) || $page->Priority > 0)) {
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// The one field that isn't easy to deal with in the template is
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// Change frequency, so we set that here.
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$date = date('Y-m-d H:i:s');
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$prop = $page->toMap();
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$created = new SS_Datetime();
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$created->value = (isset($prop['Created'])) ? $prop['Created'] : $date;
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$now = new SS_Datetime();
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$now->value = $date;
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$versions = (isset($prop['Version'])) ? $prop['Version'] : 1;
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$timediff = $now->format('U') - $created->format('U');
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// Check how many revisions have been made over the lifetime of the
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// Page for a rough estimate of it's changing frequency.
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$period = $timediff / ($versions + 1);
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if($period > 60*60*24*365) {
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// > 1 year
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$page->ChangeFreq = 'yearly';
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}
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elseif($period > 60*60*24*30) {
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$page->ChangeFreq = 'monthly';
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}
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elseif($period > 60*60*24*7) {
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// > 1 week
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$page->ChangeFreq = 'weekly';
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}
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elseif($period > 60*60*24) {
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// > 1 day
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$page->ChangeFreq = 'daily';
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}
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elseif($period > 60*60) {
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// > 1 hour
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$page->ChangeFreq = 'hourly';
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} else {
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// < 1 hour
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$page->ChangeFreq = 'always';
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}
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$newPages->push($page);
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}
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}
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}
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}
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$newPages->merge($this->addRegisteredDataObjects());
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return $newPages;
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}
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/**
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* Notifies Google about changes to your sitemap.
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* Triggered automatically on every publish/unpublish of a page.
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* This behaviour is disabled by default, enable with:
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* GoogleSitemap::enable_google_notificaton();
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*
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* If the site is in "dev-mode", no ping will be sent regardless wether
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* the Google notification is enabled.
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*
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* @return string Response text
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*/
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static function ping() {
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if(!self::$enabled) return false;
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//Don't ping if the site has disabled it, or if the site is in dev mode
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if(!GoogleSitemap::$google_notification_enabled || Director::isDev())
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return;
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$location = urlencode(Controller::join_links(
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Director::absoluteBaseURL(),
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'sitemap.xml'
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));
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$response = HTTP::sendRequest(
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"www.google.com",
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"/webmasters/sitemaps/ping",
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sprintf("sitemap=%s", $location)
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);
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return $response;
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}
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/**
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* Enable pings to google.com whenever sitemap changes.
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*
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* @return void
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*/
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public static function enable_google_notification() {
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self::$google_notification_enabled = true;
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}
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/**
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* Disables pings to google when the sitemap changes.
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*
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* @return void
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*/
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public static function disable_google_notification() {
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self::$google_notification_enabled = false;
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}
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/**
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* Default controller handler for the sitemap.xml file
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*/
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function index($url) {
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if(self::$enabled) {
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SSViewer::set_source_file_comments(false);
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$this->getResponse()->addHeader('Content-Type', 'application/xml; charset="utf-8"');
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// But we want to still render.
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return array();
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} else {
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return new SS_HTTPResponse('Not allowed', 405);
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}
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}
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/**
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* Enable the sitemap.xml file
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*
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* @return void
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*/
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public static function enable() {
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self::$enabled = true;
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}
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/**
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* Disable the sitemap.xml file
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*
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* @return void
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*/
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public static function disable() {
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self::$enabled = false;
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}
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}
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