66 lines
1.9 KiB
PHP
66 lines
1.9 KiB
PHP
<?php
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namespace Automattic\Jetpack_Boost\Lib\Critical_CSS;
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use Automattic\Jetpack_Boost\Modules\Optimizations\Critical_CSS\CSS_Proxy;
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class Generator {
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const GENERATE_QUERY_ACTION = 'jb-generate-critical-css';
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public static function init() {
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$generator = new static();
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if ( static::is_generating_critical_css() ) {
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add_action( 'wp_head', array( $generator, 'display_generate_meta' ), 0 );
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$generator->force_logged_out_render();
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}
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}
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/**
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* Force the current page to render as viewed by a logged out user. Useful when generating
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* Critical CSS.
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*/
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private function force_logged_out_render() {
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$current_user_id = get_current_user_id();
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if ( 0 !== $current_user_id ) {
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// Force current user to 0 to ensure page is rendered as a non-logged-in user.
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wp_set_current_user( 0 );
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// Turn off display of admin bar.
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add_filter( 'show_admin_bar', '__return_false', PHP_INT_MAX );
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}
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}
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/**
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* Return true if page is loaded to generate critical CSS
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*
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* phpcs:disable WordPress.Security.NonceVerification.Recommended
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*/
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public static function is_generating_critical_css() {
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return isset( $_GET[ self::GENERATE_QUERY_ACTION ] );
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}
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/**
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* Get a Critical CSS status block, adding in local generation nonces (if applicable).
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* i.e.: Call this method to supply enough Critical CSS status to kick off local generation,
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* such as in response to a request-generate API call or during page initialization.
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*/
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public function get_generation_metadata() {
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$status = array();
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// Add a user-bound nonce to use when proxying CSS for Critical CSS generation.
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$status['proxy_nonce'] = wp_create_nonce( CSS_Proxy::NONCE_ACTION );
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return $status;
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}
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/**
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* Renders a <meta> tag used to verify this is a valid page to generate Critical CSS with.
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*/
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public function display_generate_meta() {
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?>
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<meta name="<?php echo esc_attr( self::GENERATE_QUERY_ACTION ); ?>" content="true"/>
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<?php
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}
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}
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