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<?php /** * Get information about the current request. * * @package automattic/jetpack-status */ namespace Automattic\Jetpack\Status; use Automattic\Jetpack\Constants; /** * Get information about the current request. */ class Request { /** * Determine whether the current request is for accessing the frontend. * Also update Vary headers to indicate that the response may vary by Accept header. * * @return bool True if it's a frontend request, false otherwise. */ public static function is_frontend() { $is_frontend = true; $is_varying_request = true; if ( is_admin() || wp_doing_ajax() || wp_is_jsonp_request() || is_feed() || Constants::is_true( 'REST_REQUEST' ) || Constants::is_true( 'REST_API_REQUEST' ) || Constants::is_true( 'WP_CLI' ) || Constants::is_true( 'WPCOM_CLI_SCRIPT' ) // Special case for CLI scripts on WP.com that aren't using WP CLI. ) { $is_frontend = false; $is_varying_request = false; } elseif ( wp_is_json_request() || wp_is_xml_request() ) { $is_frontend = false; } /* * Check existing headers for the request. * If there is no existing Vary Accept header, add one. */ if ( $is_varying_request && ! headers_sent() ) { $headers = headers_list(); $vary_header_parts = self::get_vary_headers( $headers ); header( 'Vary: ' . implode( ', ', $vary_header_parts ) ); } /** * Filter whether the current request is for accessing the frontend. * * @since jetpack-9.0.0 * * @param bool $is_frontend Whether the current request is for accessing the frontend. */ return (bool) apply_filters( 'jetpack_is_frontend', $is_frontend ); } /** * Go through headers and get a list of Vary headers to add, * including Vary on Accept and Content-Type if necessary. * * @since jetpack-12.2 * * @param array $headers The headers to be sent. * * @return array $vary_header_parts Vary Headers to be sent. */ public static function get_vary_headers( $headers = array() ) { $vary_header_parts = array( 'accept', 'content-type' ); foreach ( $headers as $header ) { // Check for a Vary header. if ( ! str_starts_with( strtolower( $header ), 'vary:' ) ) { continue; } // If the header is a wildcard, we'll return that. if ( str_contains( $header, '*' ) ) { $vary_header_parts = array( '*' ); break; } // Remove the Vary: part of the header. $header = preg_replace( '/^vary\:\s?/i', '', $header ); // Remove spaces from the header. $header = str_replace( ' ', '', $header ); // Break the header into parts. $header_parts = explode( ',', strtolower( $header ) ); // Build an array with the Accept header and what was already there. $vary_header_parts = array_values( array_unique( array_merge( $vary_header_parts, $header_parts ) ) ); } return $vary_header_parts; } }