--- /dev/null
+<?php
+/**
+ * Customize API: WP_Customize_Selective_Refresh class
+ *
+ * @package WordPress
+ * @subpackage Customize
+ * @since 4.5.0
+ */
+
+/**
+ * Core Customizer class for implementing selective refresh.
+ *
+ * @since 4.5.0
+ */
+final class WP_Customize_Selective_Refresh {
+
+ /**
+ * Query var used in requests to render partials.
+ *
+ * @since 4.5.0
+ */
+ const RENDER_QUERY_VAR = 'wp_customize_render_partials';
+
+ /**
+ * Customize manager.
+ *
+ * @since 4.5.0
+ * @access public
+ * @var WP_Customize_Manager
+ */
+ public $manager;
+
+ /**
+ * Registered instances of WP_Customize_Partial.
+ *
+ * @since 4.5.0
+ * @access protected
+ * @var WP_Customize_Partial[]
+ */
+ protected $partials = array();
+
+ /**
+ * Log of errors triggered when partials are rendered.
+ *
+ * @since 4.5.0
+ * @access private
+ * @var array
+ */
+ protected $triggered_errors = array();
+
+ /**
+ * Keep track of the current partial being rendered.
+ *
+ * @since 4.5.0
+ * @access private
+ * @var string
+ */
+ protected $current_partial_id;
+
+ /**
+ * Plugin bootstrap for Partial Refresh functionality.
+ *
+ * @since 4.5.0
+ * @access public
+ *
+ * @param WP_Customize_Manager $manager Manager instance.
+ */
+ public function __construct( WP_Customize_Manager $manager ) {
+ $this->manager = $manager;
+ require_once( ABSPATH . WPINC . '/customize/class-wp-customize-partial.php' );
+
+ add_action( 'customize_preview_init', array( $this, 'init_preview' ) );
+ }
+
+ /**
+ * Retrieves the registered partials.
+ *
+ * @since 4.5.0
+ * @access public
+ *
+ * @return array Partials.
+ */
+ public function partials() {
+ return $this->partials;
+ }
+
+ /**
+ * Adds a partial.
+ *
+ * @since 4.5.0
+ * @access public
+ *
+ * @param WP_Customize_Partial|string $id Customize Partial object, or Panel ID.
+ * @param array $args Optional. Partial arguments. Default empty array.
+ * @return WP_Customize_Partial The instance of the panel that was added.
+ */
+ public function add_partial( $id, $args = array() ) {
+ if ( $id instanceof WP_Customize_Partial ) {
+ $partial = $id;
+ } else {
+ $class = 'WP_Customize_Partial';
+
+ /** This filter (will be) documented in wp-includes/class-wp-customize-manager.php */
+ $args = apply_filters( 'customize_dynamic_partial_args', $args, $id );
+
+ /** This filter (will be) documented in wp-includes/class-wp-customize-manager.php */
+ $class = apply_filters( 'customize_dynamic_partial_class', $class, $id, $args );
+
+ $partial = new $class( $this, $id, $args );
+ }
+
+ $this->partials[ $partial->id ] = $partial;
+ return $partial;
+ }
+
+ /**
+ * Retrieves a partial.
+ *
+ * @since 4.5.0
+ * @access public
+ *
+ * @param string $id Customize Partial ID.
+ * @return WP_Customize_Partial|null The partial, if set. Otherwise null.
+ */
+ public function get_partial( $id ) {
+ if ( isset( $this->partials[ $id ] ) ) {
+ return $this->partials[ $id ];
+ } else {
+ return null;
+ }
+ }
+
+ /**
+ * Removes a partial.
+ *
+ * @since 4.5.0
+ * @access public
+ *
+ * @param string $id Customize Partial ID.
+ */
+ public function remove_partial( $id ) {
+ unset( $this->partials[ $id ] );
+ }
+
+ /**
+ * Initializes the Customizer preview.
+ *
+ * @since 4.5.0
+ * @access public
+ */
+ public function init_preview() {
+ add_action( 'template_redirect', array( $this, 'handle_render_partials_request' ) );
+ add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_preview_scripts' ) );
+ }
+
+ /**
+ * Enqueues preview scripts.
+ *
+ * @since 4.5.0
+ * @access public
+ */
+ public function enqueue_preview_scripts() {
+ wp_enqueue_script( 'customize-selective-refresh' );
+ add_action( 'wp_footer', array( $this, 'export_preview_data' ), 1000 );
+ }
+
+ /**
+ * Exports data in preview after it has finished rendering so that partials can be added at runtime.
+ *
+ * @since 4.5.0
+ * @access public
+ */
+ public function export_preview_data() {
+ $partials = array();
+
+ foreach ( $this->partials() as $partial ) {
+ if ( $partial->check_capabilities() ) {
+ $partials[ $partial->id ] = $partial->json();
+ }
+ }
+
+ $exports = array(
+ 'partials' => $partials,
+ 'renderQueryVar' => self::RENDER_QUERY_VAR,
+ 'l10n' => array(
+ 'shiftClickToEdit' => __( 'Shift-click to edit this element.' ),
+ /* translators: %s: document.write() */
+ 'badDocumentWrite' => sprintf( __( '%s is forbidden' ), 'document.write()' ),
+ ),
+ );
+
+ // Export data to JS.
+ echo sprintf( '<script>var _customizePartialRefreshExports = %s;</script>', wp_json_encode( $exports ) );
+ }
+
+ /**
+ * Registers dynamically-created partials.
+ *
+ * @since 4.5.0
+ * @access public
+ *
+ * @see WP_Customize_Manager::add_dynamic_settings()
+ *
+ * @param array $partial_ids The partial ID to add.
+ * @return array Added WP_Customize_Partial instances.
+ */
+ public function add_dynamic_partials( $partial_ids ) {
+ $new_partials = array();
+
+ foreach ( $partial_ids as $partial_id ) {
+
+ // Skip partials already created.
+ $partial = $this->get_partial( $partial_id );
+ if ( $partial ) {
+ continue;
+ }
+
+ $partial_args = false;
+ $partial_class = 'WP_Customize_Partial';
+
+ /**
+ * Filters a dynamic partial's constructor arguments.
+ *
+ * For a dynamic partial to be registered, this filter must be employed
+ * to override the default false value with an array of args to pass to
+ * the WP_Customize_Partial constructor.
+ *
+ * @since 4.5.0
+ *
+ * @param false|array $partial_args The arguments to the WP_Customize_Partial constructor.
+ * @param string $partial_id ID for dynamic partial.
+ */
+ $partial_args = apply_filters( 'customize_dynamic_partial_args', $partial_args, $partial_id );
+ if ( false === $partial_args ) {
+ continue;
+ }
+
+ /**
+ * Filters the class used to construct partials.
+ *
+ * Allow non-statically created partials to be constructed with custom WP_Customize_Partial subclass.
+ *
+ * @since 4.5.0
+ *
+ * @param string $partial_class WP_Customize_Partial or a subclass.
+ * @param string $partial_id ID for dynamic partial.
+ * @param array $partial_args The arguments to the WP_Customize_Partial constructor.
+ */
+ $partial_class = apply_filters( 'customize_dynamic_partial_class', $partial_class, $partial_id, $partial_args );
+
+ $partial = new $partial_class( $this, $partial_id, $partial_args );
+
+ $this->add_partial( $partial );
+ $new_partials[] = $partial;
+ }
+ return $new_partials;
+ }
+
+ /**
+ * Checks whether the request is for rendering partials.
+ *
+ * Note that this will not consider whether the request is authorized or valid,
+ * just that essentially the route is a match.
+ *
+ * @since 4.5.0
+ * @access public
+ *
+ * @return bool Whether the request is for rendering partials.
+ */
+ public function is_render_partials_request() {
+ return ! empty( $_POST[ self::RENDER_QUERY_VAR ] );
+ }
+
+ /**
+ * Handles PHP errors triggered during rendering the partials.
+ *
+ * These errors will be relayed back to the client in the Ajax response.
+ *
+ * @since 4.5.0
+ * @access private
+ *
+ * @param int $errno Error number.
+ * @param string $errstr Error string.
+ * @param string $errfile Error file.
+ * @param string $errline Error line.
+ * @return true Always true.
+ */
+ public function handle_error( $errno, $errstr, $errfile = null, $errline = null ) {
+ $this->triggered_errors[] = array(
+ 'partial' => $this->current_partial_id,
+ 'error_number' => $errno,
+ 'error_string' => $errstr,
+ 'error_file' => $errfile,
+ 'error_line' => $errline,
+ );
+ return true;
+ }
+
+ /**
+ * Handles the Ajax request to return the rendered partials for the requested placements.
+ *
+ * @since 4.5.0
+ * @access public
+ */
+ public function handle_render_partials_request() {
+ if ( ! $this->is_render_partials_request() ) {
+ return;
+ }
+
+ $this->manager->remove_preview_signature();
+
+ /*
+ * Note that is_customize_preview() returning true will entail that the
+ * user passed the 'customize' capability check and the nonce check, since
+ * WP_Customize_Manager::setup_theme() is where the previewing flag is set.
+ */
+ if ( ! is_customize_preview() ) {
+ status_header( 403 );
+ wp_send_json_error( 'expected_customize_preview' );
+ } else if ( ! isset( $_POST['partials'] ) ) {
+ status_header( 400 );
+ wp_send_json_error( 'missing_partials' );
+ }
+
+ $partials = json_decode( wp_unslash( $_POST['partials'] ), true );
+
+ if ( ! is_array( $partials ) ) {
+ wp_send_json_error( 'malformed_partials' );
+ }
+
+ $this->add_dynamic_partials( array_keys( $partials ) );
+
+ /**
+ * Fires immediately before partials are rendered.
+ *
+ * Plugins may do things like call wp_enqueue_scripts() and gather a list of the scripts
+ * and styles which may get enqueued in the response.
+ *
+ * @since 4.5.0
+ *
+ * @param WP_Customize_Selective_Refresh $this Selective refresh component.
+ * @param array $partials Placements' context data for the partials rendered in the request.
+ * The array is keyed by partial ID, with each item being an array of
+ * the placements' context data.
+ */
+ do_action( 'customize_render_partials_before', $this, $partials );
+
+ set_error_handler( array( $this, 'handle_error' ), error_reporting() );
+
+ $contents = array();
+
+ foreach ( $partials as $partial_id => $container_contexts ) {
+ $this->current_partial_id = $partial_id;
+
+ if ( ! is_array( $container_contexts ) ) {
+ wp_send_json_error( 'malformed_container_contexts' );
+ }
+
+ $partial = $this->get_partial( $partial_id );
+
+ if ( ! $partial || ! $partial->check_capabilities() ) {
+ $contents[ $partial_id ] = null;
+ continue;
+ }
+
+ $contents[ $partial_id ] = array();
+
+ // @todo The array should include not only the contents, but also whether the container is included?
+ if ( empty( $container_contexts ) ) {
+ // Since there are no container contexts, render just once.
+ $contents[ $partial_id ][] = $partial->render( null );
+ } else {
+ foreach ( $container_contexts as $container_context ) {
+ $contents[ $partial_id ][] = $partial->render( $container_context );
+ }
+ }
+ }
+ $this->current_partial_id = null;
+
+ restore_error_handler();
+
+ /**
+ * Fires immediately after partials are rendered.
+ *
+ * Plugins may do things like call wp_footer() to scrape scripts output and return them
+ * via the {@see 'customize_render_partials_response'} filter.
+ *
+ * @since 4.5.0
+ *
+ * @param WP_Customize_Selective_Refresh $this Selective refresh component.
+ * @param array $partials Placements' context data for the partials rendered in the request.
+ * The array is keyed by partial ID, with each item being an array of
+ * the placements' context data.
+ */
+ do_action( 'customize_render_partials_after', $this, $partials );
+
+ $response = array(
+ 'contents' => $contents,
+ );
+
+ if ( defined( 'WP_DEBUG_DISPLAY' ) && WP_DEBUG_DISPLAY ) {
+ $response['errors'] = $this->triggered_errors;
+ }
+
+ /**
+ * Filters the response from rendering the partials.
+ *
+ * Plugins may use this filter to inject `$scripts` and `$styles`, which are dependencies
+ * for the partials being rendered. The response data will be available to the client via
+ * the `render-partials-response` JS event, so the client can then inject the scripts and
+ * styles into the DOM if they have not already been enqueued there.
+ *
+ * If plugins do this, they'll need to take care for any scripts that do `document.write()`
+ * and make sure that these are not injected, or else to override the function to no-op,
+ * or else the page will be destroyed.
+ *
+ * Plugins should be aware that `$scripts` and `$styles` may eventually be included by
+ * default in the response.
+ *
+ * @since 4.5.0
+ *
+ * @param array $response {
+ * Response.
+ *
+ * @type array $contents Associative array mapping a partial ID its corresponding array of contents
+ * for the containers requested.
+ * @type array $errors List of errors triggered during rendering of partials, if `WP_DEBUG_DISPLAY`
+ * is enabled.
+ * }
+ * @param WP_Customize_Selective_Refresh $this Selective refresh component.
+ * @param array $partials Placements' context data for the partials rendered in the request.
+ * The array is keyed by partial ID, with each item being an array of
+ * the placements' context data.
+ */
+ $response = apply_filters( 'customize_render_partials_response', $response, $this, $partials );
+
+ wp_send_json_success( $response );
+ }
+}
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