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<?php
/**
* Class ExtraThemeAndPluginHeaders.
*
* @package AmpProject\AmpWP
*/
namespace AmpProject\AmpWP;
use AmpProject\AmpWP\Infrastructure\Registerable;
use AmpProject\AmpWP\Infrastructure\Service;
/**
* Registers the 'AMP' extra header for themes and plugins.
*
* @package AmpProject\AmpWP
* @since 2.0
* @internal
*/
final class ExtraThemeAndPluginHeaders implements Service, Registerable {
/**
* Header name.
*
* @var string
*/
const AMP_HEADER = 'AMP';
/**
* AMP header value indicating legacy template support.
*
* @var string
*/
const AMP_HEADER_LEGACY = 'legacy';
/**
* Register the service with the system.
*
* @return void
*/
public function register() {
// Filter must be added as soon as possible since once wp_get_themes() is called, the results are cached.
add_filter( 'extra_theme_headers', [ $this, 'filter_extra_headers' ] );
}
/**
* Add 'AMP' to the list of headers parsed from a theme's style.css or plugin's bootstrap file.
*
* For prior precedent here, WooCommerce adds a 'Woo' header.
*
* @see wc_enable_wc_plugin_headers()
* @see \WC_Helper::get_local_woo_themes()
*
* @param string[] $headers Headers.
* @return string[] Amended headers.
*/
public function filter_extra_headers( $headers ) {
$headers[] = self::AMP_HEADER;
return $headers;
}
}