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<?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 / #[AllowDynamicProperties] 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 * @var WP_Customize_Manager / public $manager; /* * Registered instances of WP_Customize_Partial. * * @since 4.5.0 * @var WP_Customize_Partial[] / protected $partials = array(); /* * Log of errors triggered when partials are rendered. * * @since 4.5.0 * @var array / protected $triggered_errors = array(); /* * Keep track of the current partial being rendered. * * @since 4.5.0 * @var string\|null / protected $current_partial_id; /* * Plugin bootstrap for Partial Refresh functionality. * * @since 4.5.0 * * @param WP_Customize_Manager $manager Customizer bootstrap 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 * * @return array Partials. / public function partials() { return $this->partials; } /* * Adds a partial. * * @since 4.5.0 * * @see WP_Customize_Partial::__construct() * * @param WP_Customize_Partial\|string $id Customize Partial object, or Partial ID. * @param array $args Optional. Array of properties for the new Partials object. * See WP_Customize_Partial::__construct() for information * on accepted arguments. Default empty array. * @return WP_Customize_Partial The instance of the partial 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 is documented in wp-includes/customize/class-wp-customize-selective-refresh.php / $args = apply_filters( 'customize_dynamic_partial_args', $args, $id ); /* This filter is documented in wp-includes/customize/class-wp-customize-selective-refresh.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 * * @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 * * @param string $id Customize Partial ID. / public function remove_partial( $id ) { unset( $this->partials[ $id ] ); } /* * Initializes the Customizer preview. * * @since 4.5.0 / 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 / 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 / public function export_preview_data() { $partials = array(); foreach ( $this->partials() as $partial ) { if ( $partial->check_capabilities() ) { $partials[ $partial->id ] = $partial->json(); } } $switched_locale = switch_to_user_locale( get_current_user_id() ); $l10n = array( 'shiftClickToEdit' => __( 'Shift-click to edit this element.' ), 'clickEditMenu' => __( 'Click to edit this menu.' ), 'clickEditWidget' => __( 'Click to edit this widget.' ), 'clickEditTitle' => __( 'Click to edit the site title.' ), 'clickEditMisc' => __( 'Click to edit this element.' ), / translators: %s: document.write() / 'badDocumentWrite' => sprintf( __( '%s is forbidden' ), 'document.write()' ), ); if ( $switched_locale ) { restore_previous_locale(); } $exports = array( 'partials' => $partials, 'renderQueryVar' => self::RENDER_QUERY_VAR, 'l10n' => $l10n, ); // Export data to JS. wp_print_inline_script_tag( sprintf( 'var _customizePartialRefreshExports = %s;', wp_json_encode( $exports ) ) ); } /* * Registers dynamically-created partials. * * @since 4.5.0 * * @see WP_Customize_Manager::add_dynamic_settings() * * @param string[] $partial_ids Array of the partial IDs to add. * @return WP_Customize_Partial[] Array of 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 * * @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 * * @param int $errno Error number. * @param string $errstr Error string. * @param string $errfile Error file. * @param int $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 / public function handle_render_partials_request() { if ( ! $this->is_render_partials_request() ) { return; } / * 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() ) { wp_send_json_error( 'expected_customize_preview', 403 ); } elseif ( ! isset( $_POST['partials'] ) ) { wp_send_json_error( 'missing_partials', 400 ); } // Ensure that doing selective refresh on 404 template doesn't result in fallback rendering behavior (full refreshes). status_header( 200 ); $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 $refresh 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 $refresh 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; } $setting_validities = $this->manager->validate_setting_values( $this->manager->unsanitized_post_values() ); $exported_setting_validities = array_map( array( $this->manager, 'prepare_setting_validity_for_js' ), $setting_validities ); $response['setting_validities'] = $exported_setting_validities; /* * Filters the response from rendering the partials. * * Plugins may use this filter to inject `$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 $refresh 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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