141 lines
3.7 KiB
PHP
141 lines
3.7 KiB
PHP
<?php
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namespace Wilr\GoogleSitemaps\Extensions;
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use SilverStripe\Control\Director;
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use SilverStripe\ORM\DataExtension;
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use SilverStripe\ORM\FieldType\DBDatetime;
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use Wilr\GoogleSitemaps\GoogleSitemap;
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/**
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* Decorate the page object to provide google sitemaps with additional options
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* and configuration.
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*/
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class GoogleSitemapExtension extends DataExtension
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{
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/**
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* @return boolean
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*/
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public function canIncludeInGoogleSitemap()
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{
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$can = true;
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if ($this->owner->hasMethod('AbsoluteLink')) {
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$hostHttp = parse_url(Director::protocolAndHost(), PHP_URL_HOST);
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$objHttp = parse_url($this->owner->AbsoluteLink(), PHP_URL_HOST);
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if ($objHttp != $hostHttp) {
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$can = false;
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}
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}
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if ($can) {
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$can = $this->owner->canView();
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}
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if ($can) {
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$can = ($this->owner->getGooglePriority() !== false);
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}
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if ($can === false) {
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return false;
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}
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// Allow override. In this case, since this can return multiple results, we'll use an "and" based policy.
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// That is if any value is false then the current value will be false. Only only if all are true will we
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// then return true.
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$override = $this->owner->invokeWithExtensions('alterCanIncludeInGoogleSitemap', $can);
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if ($override) {
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$can = min($override, $can);
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}
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return $can;
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}
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/**
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* @return void
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*/
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public function onAfterPublish()
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{
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GoogleSitemap::ping();
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}
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/**
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* @return void
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*/
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public function onAfterUnpublish()
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{
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GoogleSitemap::ping();
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}
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/**
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* The default value of the priority field depends on the depth of the page in
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* the site tree, so it must be calculated dynamically.
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*
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* @return mixed
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*/
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public function getGooglePriority()
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{
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$field = $this->owner->hasField('Priority');
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if ($field) {
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$priority = $this->owner->getField('Priority');
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return ($priority < 0) ? false : $priority;
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}
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return GoogleSitemap::get_priority_for_class($this->owner->class);
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}
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/**
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* Returns a pages change frequency calculated by pages age and number of
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* versions. Google expects always, hourly, daily, weekly, monthly, yearly
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* or never as values.
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*
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* @see http://support.google.com/webmasters/bin/answer.py?hl=en&answer=183668&topic=8476&ctx=topic
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*
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* @return DBDatetime
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*/
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public function getChangeFrequency()
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{
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if ($freq = GoogleSitemap::get_frequency_for_class($this->owner->class)) {
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return $freq;
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}
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$date = date('Y-m-d H:i:s');
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$created = new DBDatetime();
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$created->value = ($this->owner->Created) ? $this->owner->Created : $date;
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$now = new DBDatetime();
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$now->value = $date;
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$versions = ($this->owner->Version) ? $this->owner->Version : 1;
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$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 ($period > 60 * 60 * 24 * 365) {
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$freq = 'yearly';
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} elseif ($period > 60 * 60 * 24 * 30) {
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$freq = 'monthly';
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} elseif ($period > 60 * 60 * 24 * 7) {
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$freq = 'weekly';
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} elseif ($period > 60 * 60 * 24) {
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$freq = 'daily';
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} elseif ($period > 60 * 60) {
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$freq = 'hourly';
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} else {
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$freq = 'always';
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}
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return $freq;
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}
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}
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