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<?php
/**
* Speculation Rules implementation for cornerstone pages
*
* @package Boost
* @since 3.13.0
*/
namespace Automattic\Jetpack_Boost\Modules\Optimizations\Speculation_Rules;
use Automattic\Jetpack_Boost\Contracts\Changes_Output_On_Activation;
use Automattic\Jetpack_Boost\Contracts\Feature;
use Automattic\Jetpack_Boost\Contracts\Optimization;
use Automattic\Jetpack_Boost\Lib\Cornerstone\Cornerstone_Utils;
/**
* Class to handle speculation rules for cornerstone pages
*/
class Speculation_Rules implements Feature, Changes_Output_On_Activation, Optimization {
/**
* Get the slug for this module.
*
* @return string
*/
public static function get_slug() {
return 'speculation_rules';
}
/**
* Check if the feature is available
*
* @return bool
*/
public static function is_available() {
global $wp_version;
return version_compare( $wp_version, '6.8-beta3', '>=' );
}
/**
* Initialize the speculation rules
*
* @since 3.13.0
* @return void
*/
public function setup() {
// Use WP core action to add speculation rules
add_action( 'wp_load_speculation_rules', array( $this, 'add_cornerstone_rules' ) );
}
/**
* Add speculation rules for cornerstone pages
*
* @param \WP_Speculation_Rules $speculation_rules The speculation rules instance.
* @since 3.13.0
* @return void
*/
public function add_cornerstone_rules( $speculation_rules ) {
$cornerstone_urls = $this->get_cornerstone_urls();
if ( empty( $cornerstone_urls ) ) {
return;
}
// remove the protocol and domain from the list of cornerstone urls
$home_url = wp_parse_url( home_url() );
$domain = $home_url['host'];
$protocol = $home_url['scheme'];
$cornerstone_urls = array_map(
function ( $url ) use ( $protocol, $domain ) {
return trailingslashit( str_replace( $protocol . '://' . $domain, '', $url ) );
},
$cornerstone_urls
);
// Add prerender rule for cornerstone pages with moderate eagerness
$speculation_rules->add_rule(
'prerender',
'cornerstone-pages-prerender',
array(
'source' => 'document',
'where' => array(
'href_matches' => $cornerstone_urls,
),
'eagerness' => 'moderate',
)
);
}
/**
* Get the list of cornerstone page URLs
*
* @since 3.13.0
* @return array Array of cornerstone page URLs
*/
private function get_cornerstone_urls() {
$cornerstone_urls = Cornerstone_Utils::get_list();
if ( empty( $cornerstone_urls ) ) {
return array();
}
return $cornerstone_urls;
}
}