Add upstream
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<?php
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/**
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* WordPress.com Block Editor
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* Allow new block editor posts to be composed on WordPress.com.
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* This is auto-loaded as of Jetpack v7.4 for sites connected to WordPress.com only.
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*
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* @package Jetpack
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*/
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/**
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* WordPress.com Block editor for Jetpack
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*/
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class Jetpack_WPCOM_Block_Editor {
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/**
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* ID of the user who signed the nonce.
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*
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* @var int
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*/
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private $nonce_user_id;
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/**
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* Singleton
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*/
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public static function init() {
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static $instance = false;
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if ( ! $instance ) {
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$instance = new Jetpack_WPCOM_Block_Editor();
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}
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return $instance;
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}
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/**
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* Jetpack_WPCOM_Block_Editor constructor.
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*/
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private function __construct() {
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if ( $this->is_iframed_block_editor() ) {
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add_action( 'admin_init', array( $this, 'disable_send_frame_options_header' ), 9 );
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add_filter( 'admin_body_class', array( $this, 'add_iframed_body_class' ) );
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}
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add_action( 'login_init', array( $this, 'allow_block_editor_login' ), 1 );
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add_action( 'enqueue_block_editor_assets', array( $this, 'enqueue_scripts' ), 9 );
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add_filter( 'mce_external_plugins', array( $this, 'add_tinymce_plugins' ) );
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}
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/**
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* Checks if we are embedding the block editor in an iframe in WordPress.com.
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*
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* @return bool Whether the current request is from the iframed block editor.
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*/
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public function is_iframed_block_editor() {
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global $pagenow;
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// phpcs:ignore WordPress.Security.NonceVerification
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return ( 'post.php' === $pagenow || 'post-new.php' === $pagenow ) && ! empty( $_GET['frame-nonce'] );
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}
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/**
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* Prevents frame options header from firing if this is a whitelisted iframe request.
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*/
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public function disable_send_frame_options_header() {
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// phpcs:ignore WordPress.Security.NonceVerification
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if ( $this->framing_allowed( $_GET['frame-nonce'] ) ) {
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remove_action( 'admin_init', 'send_frame_options_header' );
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}
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}
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/**
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* Adds custom admin body class if this is a whitelisted iframe request.
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*
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* @param string $classes Admin body classes.
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* @return string
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*/
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public function add_iframed_body_class( $classes ) {
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// phpcs:ignore WordPress.Security.NonceVerification
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if ( $this->framing_allowed( $_GET['frame-nonce'] ) ) {
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$classes .= ' is-iframed ';
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}
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return $classes;
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}
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/**
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* Allows to iframe the login page if a user is logged out
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* while trying to access the block editor from wordpress.com.
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*/
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public function allow_block_editor_login() {
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// phpcs:ignore WordPress.Security.NonceVerification
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if ( empty( $_REQUEST['redirect_to'] ) ) {
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return;
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}
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// phpcs:ignore WordPress.Security.NonceVerification
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$query = wp_parse_url( urldecode( $_REQUEST['redirect_to'] ), PHP_URL_QUERY );
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$args = wp_parse_args( $query );
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// Check nonce and make sure this is a Gutenframe request.
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if ( ! empty( $args['frame-nonce'] ) && $this->framing_allowed( $args['frame-nonce'] ) ) {
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// If SSO is active, we'll let WordPress.com handle authentication...
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if ( Jetpack::is_module_active( 'sso' ) ) {
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// ...but only if it's not an Atomic site. They already do that.
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if ( ! jetpack_is_atomic_site() ) {
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add_filter( 'jetpack_sso_bypass_login_forward_wpcom', '__return_true' );
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}
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} else {
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$_REQUEST['interim-login'] = true;
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add_action( 'wp_login', array( $this, 'do_redirect' ) );
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add_action( 'login_form', array( $this, 'add_login_html' ) );
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add_filter( 'wp_login_errors', array( $this, 'add_login_message' ) );
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remove_action( 'login_init', 'send_frame_options_header' );
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wp_add_inline_style( 'login', '.interim-login #login{padding-top:8%}' );
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}
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}
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}
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/**
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* Adds a login message.
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*
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* Intended to soften the expectation mismatch of ending up with a login screen rather than the editor.
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*
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* @param WP_Error $errors WP Error object.
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* @return \WP_Error
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*/
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public function add_login_message( $errors ) {
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$errors->remove( 'expired' );
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$errors->add( 'info', __( 'Before we continue, please log in to your Jetpack site.', 'jetpack' ), 'message' );
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return $errors;
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}
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/**
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* Maintains the `redirect_to` parameter in login form links.
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* Adds visual feedback of login in progress.
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*/
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public function add_login_html() {
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?>
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<input type="hidden" name="redirect_to" value="<?php echo esc_url( $_REQUEST['redirect_to'] ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended ?>" />
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<script type="application/javascript">
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document.getElementById( 'loginform' ).addEventListener( 'submit' , function() {
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document.getElementById( 'wp-submit' ).setAttribute( 'disabled', 'disabled' );
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document.getElementById( 'wp-submit' ).value = '<?php echo esc_js( __( 'Logging In...', 'jetpack' ) ); ?>';
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} );
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</script>
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<?php
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}
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/**
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* Does the redirect to the block editor.
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*/
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public function do_redirect() {
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wp_safe_redirect( $GLOBALS['redirect_to'] );
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exit;
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}
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/**
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* Checks whether this is a whitelisted iframe request.
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*
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* @param string $nonce Nonce to verify.
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* @return bool
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*/
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public function framing_allowed( $nonce ) {
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$verified = $this->verify_frame_nonce( $nonce, 'frame-' . Jetpack_Options::get_option( 'id' ) );
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if ( is_wp_error( $verified ) ) {
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wp_die( $verified ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
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}
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if ( $verified && ! defined( 'IFRAME_REQUEST' ) ) {
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define( 'IFRAME_REQUEST', true );
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}
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return (bool) $verified;
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}
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/**
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* Verify that correct nonce was used with time limit.
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*
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* The user is given an amount of time to use the token, so therefore, since the
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* UID and $action remain the same, the independent variable is the time.
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*
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* @param string $nonce Nonce that was used in the form to verify.
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* @param string $action Should give context to what is taking place and be the same when nonce was created.
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* @return boolean|WP_Error Whether the nonce is valid.
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*/
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public function verify_frame_nonce( $nonce, $action ) {
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if ( empty( $nonce ) ) {
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return false;
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}
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list( $expiration, $user_id, $hash ) = explode( ':', $nonce, 3 );
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$this->nonce_user_id = (int) $user_id;
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if ( ! $this->nonce_user_id ) {
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return false;
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}
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$token = Jetpack_Data::get_access_token( $this->nonce_user_id );
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if ( ! $token ) {
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return false;
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}
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/*
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* Failures must return `false` (blocking the iframe) prior to the
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* signature verification.
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*/
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add_filter( 'salt', array( $this, 'filter_salt' ), 10, 2 );
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$expected_hash = wp_hash( "$expiration|$action|{$this->nonce_user_id}", 'jetpack_frame_nonce' );
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remove_filter( 'salt', array( $this, 'filter_salt' ) );
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if ( ! hash_equals( $hash, $expected_hash ) ) {
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return false;
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}
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/*
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* Failures may return `WP_Error` (showing an error in the iframe) after the
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* signature verification passes.
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*/
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if ( time() > $expiration ) {
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return new WP_Error( 'nonce_invalid_expired', 'Expired nonce.', array( 'status' => 401 ) );
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}
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// Check if it matches the current user, unless they're trying to log in.
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if ( get_current_user_id() !== $this->nonce_user_id && ! doing_action( 'login_init' ) ) {
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return new WP_Error( 'nonce_invalid_user_mismatch', 'User ID mismatch.', array( 'status' => 401 ) );
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}
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return true;
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}
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/**
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* Filters the WordPress salt.
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*
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* @param string $salt Salt for the given scheme.
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* @param string $scheme Authentication scheme.
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* @return string
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*/
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public function filter_salt( $salt, $scheme ) {
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if ( 'jetpack_frame_nonce' === $scheme ) {
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$token = Jetpack_Data::get_access_token( $this->nonce_user_id );
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if ( $token ) {
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$salt = $token->secret;
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}
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}
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return $salt;
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}
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/**
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* Enqueue the scripts for the WordPress.com block editor integration.
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*/
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public function enqueue_scripts() {
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$debug = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG;
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$version = gmdate( 'Ymd' );
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$src_common = $debug
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? '//widgets.wp.com/wpcom-block-editor/common.js?minify=false'
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: '//widgets.wp.com/wpcom-block-editor/common.min.js';
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wp_enqueue_script(
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'wpcom-block-editor-common',
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$src_common,
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array(
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'jquery',
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'lodash',
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'wp-blocks',
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'wp-compose',
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'wp-data',
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'wp-dom-ready',
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'wp-editor',
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'wp-nux',
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'wp-plugins',
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'wp-polyfill',
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'wp-rich-text',
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),
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$version,
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true
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);
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wp_localize_script(
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'wpcom-block-editor-common',
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'wpcomGutenberg',
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array(
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'switchToClassic' => array(
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'isVisible' => $this->is_iframed_block_editor(),
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'label' => __( 'Switch to Classic Editor', 'jetpack' ),
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'url' => Jetpack_Calypsoify::getInstance()->get_switch_to_classic_editor_url(),
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),
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'richTextToolbar' => array(
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'justify' => __( 'Justify', 'jetpack' ),
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'underline' => __( 'Underline', 'jetpack' ),
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),
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)
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);
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$src_styles = $debug
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? '//widgets.wp.com/wpcom-block-editor/common.css?minify=false'
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: '//widgets.wp.com/wpcom-block-editor/common.min.css';
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wp_enqueue_style(
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'wpcom-block-editor-styles',
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$src_styles,
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array(),
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$version
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);
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if ( $this->is_iframed_block_editor() ) {
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$src_calypso_iframe_bridge = $debug
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? '//widgets.wp.com/wpcom-block-editor/calypso-iframe-bridge-server.js?minify=false'
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: '//widgets.wp.com/wpcom-block-editor/calypso-iframe-bridge-server.min.js';
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wp_enqueue_script(
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'wpcom-block-editor-calypso-iframe-bridge',
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$src_calypso_iframe_bridge,
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array(
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'calypsoify_wpadminmods_js',
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'jquery',
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'lodash',
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'react',
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'wp-blocks',
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'wp-data',
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'wp-hooks',
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'wp-polyfill',
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'wp-tinymce',
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'wp-url',
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),
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$version,
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true
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);
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}
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}
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/**
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* Register the Tiny MCE plugins for the WordPress.com block editor integration.
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*
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* @param array $plugin_array An array of external Tiny MCE plugins.
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* @return array External TinyMCE plugins.
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*/
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public function add_tinymce_plugins( $plugin_array ) {
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if ( $this->is_iframed_block_editor() ) {
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$debug = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG;
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$src_calypso_tinymce = $debug
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? '//widgets.wp.com/wpcom-block-editor/calypso-tinymce.js?minify=false'
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: '//widgets.wp.com/wpcom-block-editor/calypso-tinymce.min.js';
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$plugin_array['gutenberg-wpcom-iframe-media-modal'] = add_query_arg(
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'v',
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gmdate( 'YW' ),
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$src_calypso_tinymce
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);
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}
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return $plugin_array;
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}
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}
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Jetpack_WPCOM_Block_Editor::init();
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