silverstripe-googlesitemaps/code/extensions/GoogleSitemapExtension.php

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<?php
/**
* Decorate the page object to provide google sitemaps with
* additionally options and configuration.
*
* @package googlesitemaps
*/
class GoogleSitemapExtension extends DataExtension {
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/**
* @return boolean
*/
public function canIncludeInGoogleSitemap() {
$can = true;
if($this->owner->hasMethod('AbsoluteLink')) {
$hostHttp = parse_url(Director::protocolAndHost(), PHP_URL_HOST);
$objHttp = parse_url($this->owner->AbsoluteLink(), PHP_URL_HOST);
if($objHttp != $hostHttp) {
$can = false;
}
}
if($can) {
$can = $this->owner->canView();
}
if($can) {
$can = $this->owner->getGooglePriority();
}
$this->owner->invokeWithExtensions('alterCanIncludeInGoogleSitemap', $can);
return $can;
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}
/**
* @return void
*/
public function onAfterPublish() {
GoogleSitemap::ping();
}
/**
* @return void
*/
public function onAfterUnpublish() {
GoogleSitemap::ping();
}
/**
* The default value of the priority field depends on the depth of the page in
* the site tree, so it must be calculated dynamically.
*
* @return mixed
*/
public function getGooglePriority() {
$field = $this->owner->hasField('Priority');
if(isset($this->Priority) || ($field && $this->Priority = $this->owner->getField('Priority'))) {
return ($this->Priority < 0) ? false : $this->Priority;
}
return GoogleSitemap::get_priority_for_class($this->owner->class);
}
/**
* Returns a pages change frequency calculated by pages age and number of
* versions. Google expects always, hourly, daily, weekly, monthly, yearly
* or never as values.
*
* @see http://support.google.com/webmasters/bin/answer.py?hl=en&answer=183668&topic=8476&ctx=topic
*
* @return SS_Datetime
*/
public function getChangeFrequency() {
if($freq = GoogleSitemap::get_frequency_for_class($this->owner->class)) {
return $freq;
}
$date = date('Y-m-d H:i:s');
$created = new SS_Datetime();
$created->value = ($this->owner->Created) ? $this->owner->Created : $date;
$now = new SS_Datetime();
$now->value = $date;
$versions = ($this->owner->Version) ? $this->owner->Version : 1;
$timediff = $now->format('U') - $created->format('U');
// Check how many revisions have been made over the lifetime of the
// Page for a rough estimate of it's changing frequency.
$period = $timediff / ($versions + 1);
if ($period > 60 * 60 * 24 * 365) {
$freq = 'yearly';
} elseif ($period > 60 * 60 * 24 * 30) {
$freq = 'monthly';
} elseif ($period > 60 * 60 * 24 * 7) {
$freq = 'weekly';
} elseif ($period > 60 * 60 * 24) {
$freq = 'daily';
} elseif ($period > 60 * 60) {
$freq = 'hourly';
} else {
$freq = 'always';
}
return $freq;
}
}