1<?php
2/**
3 * WordPress Customize Manager classes
4 *
5 * @package WordPress
6 * @subpackage Customize
7 * @since 3.4.0
8 */
9
10/**
11 * Customize Manager class.
12 *
13 * Bootstraps the Customize experience on the server-side.
14 *
15 * Sets up the theme-switching process if a theme other than the active one is
16 * being previewed and customized.
17 *
18 * Serves as a factory for Customize Controls and Settings, and
19 * instantiates default Customize Controls and Settings.
20 *
21 * @since 3.4.0
22 */
23final class WP_Customize_Manager {
24	/**
25	 * An instance of the theme being previewed.
26	 *
27	 * @since 3.4.0
28	 * @var WP_Theme
29	 */
30	protected $theme;
31
32	/**
33	 * The directory name of the previously active theme (within the theme_root).
34	 *
35	 * @since 3.4.0
36	 * @var string
37	 */
38	protected $original_stylesheet;
39
40	/**
41	 * Whether this is a Customizer pageload.
42	 *
43	 * @since 3.4.0
44	 * @var bool
45	 */
46	protected $previewing = false;
47
48	/**
49	 * Methods and properties dealing with managing widgets in the Customizer.
50	 *
51	 * @since 3.9.0
52	 * @var WP_Customize_Widgets
53	 */
54	public $widgets;
55
56	/**
57	 * Methods and properties dealing with managing nav menus in the Customizer.
58	 *
59	 * @since 4.3.0
60	 * @var WP_Customize_Nav_Menus
61	 */
62	public $nav_menus;
63
64	/**
65	 * Methods and properties dealing with selective refresh in the Customizer preview.
66	 *
67	 * @since 4.5.0
68	 * @var WP_Customize_Selective_Refresh
69	 */
70	public $selective_refresh;
71
72	/**
73	 * Registered instances of WP_Customize_Setting.
74	 *
75	 * @since 3.4.0
76	 * @var array
77	 */
78	protected $settings = array();
79
80	/**
81	 * Sorted top-level instances of WP_Customize_Panel and WP_Customize_Section.
82	 *
83	 * @since 4.0.0
84	 * @var array
85	 */
86	protected $containers = array();
87
88	/**
89	 * Registered instances of WP_Customize_Panel.
90	 *
91	 * @since 4.0.0
92	 * @var array
93	 */
94	protected $panels = array();
95
96	/**
97	 * List of core components.
98	 *
99	 * @since 4.5.0
100	 * @var array
101	 */
102	protected $components = array( 'widgets', 'nav_menus' );
103
104	/**
105	 * Registered instances of WP_Customize_Section.
106	 *
107	 * @since 3.4.0
108	 * @var array
109	 */
110	protected $sections = array();
111
112	/**
113	 * Registered instances of WP_Customize_Control.
114	 *
115	 * @since 3.4.0
116	 * @var array
117	 */
118	protected $controls = array();
119
120	/**
121	 * Panel types that may be rendered from JS templates.
122	 *
123	 * @since 4.3.0
124	 * @var array
125	 */
126	protected $registered_panel_types = array();
127
128	/**
129	 * Section types that may be rendered from JS templates.
130	 *
131	 * @since 4.3.0
132	 * @var array
133	 */
134	protected $registered_section_types = array();
135
136	/**
137	 * Control types that may be rendered from JS templates.
138	 *
139	 * @since 4.1.0
140	 * @var array
141	 */
142	protected $registered_control_types = array();
143
144	/**
145	 * Initial URL being previewed.
146	 *
147	 * @since 4.4.0
148	 * @var string
149	 */
150	protected $preview_url;
151
152	/**
153	 * URL to link the user to when closing the Customizer.
154	 *
155	 * @since 4.4.0
156	 * @var string
157	 */
158	protected $return_url;
159
160	/**
161	 * Mapping of 'panel', 'section', 'control' to the ID which should be autofocused.
162	 *
163	 * @since 4.4.0
164	 * @var array
165	 */
166	protected $autofocus = array();
167
168	/**
169	 * Messenger channel.
170	 *
171	 * @since 4.7.0
172	 * @var string
173	 */
174	protected $messenger_channel;
175
176	/**
177	 * Whether the autosave revision of the changeset should be loaded.
178	 *
179	 * @since 4.9.0
180	 * @var bool
181	 */
182	protected $autosaved = false;
183
184	/**
185	 * Whether the changeset branching is allowed.
186	 *
187	 * @since 4.9.0
188	 * @var bool
189	 */
190	protected $branching = true;
191
192	/**
193	 * Whether settings should be previewed.
194	 *
195	 * @since 4.9.0
196	 * @var bool
197	 */
198	protected $settings_previewed = true;
199
200	/**
201	 * Whether a starter content changeset was saved.
202	 *
203	 * @since 4.9.0
204	 * @var bool
205	 */
206	protected $saved_starter_content_changeset = false;
207
208	/**
209	 * Unsanitized values for Customize Settings parsed from $_POST['customized'].
210	 *
211	 * @var array
212	 */
213	private $_post_values;
214
215	/**
216	 * Changeset UUID.
217	 *
218	 * @since 4.7.0
219	 * @var string
220	 */
221	private $_changeset_uuid;
222
223	/**
224	 * Changeset post ID.
225	 *
226	 * @since 4.7.0
227	 * @var int|false
228	 */
229	private $_changeset_post_id;
230
231	/**
232	 * Changeset data loaded from a customize_changeset post.
233	 *
234	 * @since 4.7.0
235	 * @var array|null
236	 */
237	private $_changeset_data;
238
239	/**
240	 * Constructor.
241	 *
242	 * @since 3.4.0
243	 * @since 4.7.0 Added `$args` parameter.
244	 *
245	 * @param array $args {
246	 *     Args.
247	 *
248	 *     @type null|string|false $changeset_uuid     Changeset UUID, the `post_name` for the customize_changeset post containing the customized state.
249	 *                                                 Defaults to `null` resulting in a UUID to be immediately generated. If `false` is provided, then
250	 *                                                 then the changeset UUID will be determined during `after_setup_theme`: when the
251	 *                                                 `customize_changeset_branching` filter returns false, then the default UUID will be that
252	 *                                                 of the most recent `customize_changeset` post that has a status other than 'auto-draft',
253	 *                                                 'publish', or 'trash'. Otherwise, if changeset branching is enabled, then a random UUID will be used.
254	 *     @type string            $theme              Theme to be previewed (for theme switch). Defaults to customize_theme or theme query params.
255	 *     @type string            $messenger_channel  Messenger channel. Defaults to customize_messenger_channel query param.
256	 *     @type bool              $settings_previewed If settings should be previewed. Defaults to true.
257	 *     @type bool              $branching          If changeset branching is allowed; otherwise, changesets are linear. Defaults to true.
258	 *     @type bool              $autosaved          If data from a changeset's autosaved revision should be loaded if it exists. Defaults to false.
259	 * }
260	 */
261	public function __construct( $args = array() ) {
262
263		$args = array_merge(
264			array_fill_keys( array( 'changeset_uuid', 'theme', 'messenger_channel', 'settings_previewed', 'autosaved', 'branching' ), null ),
265			$args
266		);
267
268		// Note that the UUID format will be validated in the setup_theme() method.
269		if ( ! isset( $args['changeset_uuid'] ) ) {
270			$args['changeset_uuid'] = wp_generate_uuid4();
271		}
272
273		// The theme and messenger_channel should be supplied via $args,
274		// but they are also looked at in the $_REQUEST global here for back-compat.
275		if ( ! isset( $args['theme'] ) ) {
276			if ( isset( $_REQUEST['customize_theme'] ) ) {
277				$args['theme'] = wp_unslash( $_REQUEST['customize_theme'] );
278			} elseif ( isset( $_REQUEST['theme'] ) ) { // Deprecated.
279				$args['theme'] = wp_unslash( $_REQUEST['theme'] );
280			}
281		}
282		if ( ! isset( $args['messenger_channel'] ) && isset( $_REQUEST['customize_messenger_channel'] ) ) {
283			$args['messenger_channel'] = sanitize_key( wp_unslash( $_REQUEST['customize_messenger_channel'] ) );
284		}
285
286		$this->original_stylesheet = get_stylesheet();
287		$this->theme               = wp_get_theme( 0 === validate_file( $args['theme'] ) ? $args['theme'] : null );
288		$this->messenger_channel   = $args['messenger_channel'];
289		$this->_changeset_uuid     = $args['changeset_uuid'];
290
291		foreach ( array( 'settings_previewed', 'autosaved', 'branching' ) as $key ) {
292			if ( isset( $args[ $key ] ) ) {
293				$this->$key = (bool) $args[ $key ];
294			}
295		}
296
297		require_once ABSPATH . WPINC . '/class-wp-customize-setting.php';
298		require_once ABSPATH . WPINC . '/class-wp-customize-panel.php';
299		require_once ABSPATH . WPINC . '/class-wp-customize-section.php';
300		require_once ABSPATH . WPINC . '/class-wp-customize-control.php';
301
302		require_once ABSPATH . WPINC . '/customize/class-wp-customize-color-control.php';
303		require_once ABSPATH . WPINC . '/customize/class-wp-customize-media-control.php';
304		require_once ABSPATH . WPINC . '/customize/class-wp-customize-upload-control.php';
305		require_once ABSPATH . WPINC . '/customize/class-wp-customize-image-control.php';
306		require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-image-control.php';
307		require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-position-control.php';
308		require_once ABSPATH . WPINC . '/customize/class-wp-customize-cropped-image-control.php';
309		require_once ABSPATH . WPINC . '/customize/class-wp-customize-site-icon-control.php';
310		require_once ABSPATH . WPINC . '/customize/class-wp-customize-header-image-control.php';
311		require_once ABSPATH . WPINC . '/customize/class-wp-customize-theme-control.php';
312		require_once ABSPATH . WPINC . '/customize/class-wp-customize-code-editor-control.php';
313		require_once ABSPATH . WPINC . '/customize/class-wp-widget-area-customize-control.php';
314		require_once ABSPATH . WPINC . '/customize/class-wp-widget-form-customize-control.php';
315		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-control.php';
316		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-control.php';
317		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-location-control.php';
318		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-name-control.php';
319		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-locations-control.php';
320		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-auto-add-control.php';
321
322		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menus-panel.php';
323
324		require_once ABSPATH . WPINC . '/customize/class-wp-customize-themes-panel.php';
325		require_once ABSPATH . WPINC . '/customize/class-wp-customize-themes-section.php';
326		require_once ABSPATH . WPINC . '/customize/class-wp-customize-sidebar-section.php';
327		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-section.php';
328
329		require_once ABSPATH . WPINC . '/customize/class-wp-customize-custom-css-setting.php';
330		require_once ABSPATH . WPINC . '/customize/class-wp-customize-filter-setting.php';
331		require_once ABSPATH . WPINC . '/customize/class-wp-customize-header-image-setting.php';
332		require_once ABSPATH . WPINC . '/customize/class-wp-customize-background-image-setting.php';
333		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-item-setting.php';
334		require_once ABSPATH . WPINC . '/customize/class-wp-customize-nav-menu-setting.php';
335
336		/**
337		 * Filters the core Customizer components to load.
338		 *
339		 * This allows Core components to be excluded from being instantiated by
340		 * filtering them out of the array. Note that this filter generally runs
341		 * during the {@see 'plugins_loaded'} action, so it cannot be added
342		 * in a theme.
343		 *
344		 * @since 4.4.0
345		 *
346		 * @see WP_Customize_Manager::__construct()
347		 *
348		 * @param string[]             $components Array of core components to load.
349		 * @param WP_Customize_Manager $this       WP_Customize_Manager instance.
350		 */
351		$components = apply_filters( 'customize_loaded_components', $this->components, $this );
352
353		require_once ABSPATH . WPINC . '/customize/class-wp-customize-selective-refresh.php';
354		$this->selective_refresh = new WP_Customize_Selective_Refresh( $this );
355
356		if ( in_array( 'widgets', $components, true ) ) {
357			require_once ABSPATH . WPINC . '/class-wp-customize-widgets.php';
358			$this->widgets = new WP_Customize_Widgets( $this );
359		}
360
361		if ( in_array( 'nav_menus', $components, true ) ) {
362			require_once ABSPATH . WPINC . '/class-wp-customize-nav-menus.php';
363			$this->nav_menus = new WP_Customize_Nav_Menus( $this );
364		}
365
366		add_action( 'setup_theme', array( $this, 'setup_theme' ) );
367		add_action( 'wp_loaded', array( $this, 'wp_loaded' ) );
368
369		// Do not spawn cron (especially the alternate cron) while running the Customizer.
370		remove_action( 'init', 'wp_cron' );
371
372		// Do not run update checks when rendering the controls.
373		remove_action( 'admin_init', '_maybe_update_core' );
374		remove_action( 'admin_init', '_maybe_update_plugins' );
375		remove_action( 'admin_init', '_maybe_update_themes' );
376
377		add_action( 'wp_ajax_customize_save', array( $this, 'save' ) );
378		add_action( 'wp_ajax_customize_trash', array( $this, 'handle_changeset_trash_request' ) );
379		add_action( 'wp_ajax_customize_refresh_nonces', array( $this, 'refresh_nonces' ) );
380		add_action( 'wp_ajax_customize_load_themes', array( $this, 'handle_load_themes_request' ) );
381		add_filter( 'heartbeat_settings', array( $this, 'add_customize_screen_to_heartbeat_settings' ) );
382		add_filter( 'heartbeat_received', array( $this, 'check_changeset_lock_with_heartbeat' ), 10, 3 );
383		add_action( 'wp_ajax_customize_override_changeset_lock', array( $this, 'handle_override_changeset_lock_request' ) );
384		add_action( 'wp_ajax_customize_dismiss_autosave_or_lock', array( $this, 'handle_dismiss_autosave_or_lock_request' ) );
385
386		add_action( 'customize_register', array( $this, 'register_controls' ) );
387		add_action( 'customize_register', array( $this, 'register_dynamic_settings' ), 11 ); // Allow code to create settings first.
388		add_action( 'customize_controls_init', array( $this, 'prepare_controls' ) );
389		add_action( 'customize_controls_enqueue_scripts', array( $this, 'enqueue_control_scripts' ) );
390
391		// Render Common, Panel, Section, and Control templates.
392		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_panel_templates' ), 1 );
393		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_section_templates' ), 1 );
394		add_action( 'customize_controls_print_footer_scripts', array( $this, 'render_control_templates' ), 1 );
395
396		// Export header video settings with the partial response.
397		add_filter( 'customize_render_partials_response', array( $this, 'export_header_video_settings' ), 10, 3 );
398
399		// Export the settings to JS via the _wpCustomizeSettings variable.
400		add_action( 'customize_controls_print_footer_scripts', array( $this, 'customize_pane_settings' ), 1000 );
401
402		// Add theme update notices.
403		if ( current_user_can( 'install_themes' ) || current_user_can( 'update_themes' ) ) {
404			require_once ABSPATH . 'wp-admin/includes/update.php';
405			add_action( 'customize_controls_print_footer_scripts', 'wp_print_admin_notice_templates' );
406		}
407	}
408
409	/**
410	 * Return true if it's an Ajax request.
411	 *
412	 * @since 3.4.0
413	 * @since 4.2.0 Added `$action` param.
414	 *
415	 * @param string|null $action Whether the supplied Ajax action is being run.
416	 * @return bool True if it's an Ajax request, false otherwise.
417	 */
418	public function doing_ajax( $action = null ) {
419		if ( ! wp_doing_ajax() ) {
420			return false;
421		}
422
423		if ( ! $action ) {
424			return true;
425		} else {
426			/*
427			 * Note: we can't just use doing_action( "wp_ajax_{$action}" ) because we need
428			 * to check before admin-ajax.php gets to that point.
429			 */
430			return isset( $_REQUEST['action'] ) && wp_unslash( $_REQUEST['action'] ) === $action;
431		}
432	}
433
434	/**
435	 * Custom wp_die wrapper. Returns either the standard message for UI
436	 * or the Ajax message.
437	 *
438	 * @since 3.4.0
439	 *
440	 * @param string|WP_Error $ajax_message Ajax return.
441	 * @param string          $message      Optional. UI message.
442	 */
443	protected function wp_die( $ajax_message, $message = null ) {
444		if ( $this->doing_ajax() ) {
445			wp_die( $ajax_message );
446		}
447
448		if ( ! $message ) {
449			$message = __( 'Something went wrong.' );
450		}
451
452		if ( $this->messenger_channel ) {
453			ob_start();
454			wp_enqueue_scripts();
455			wp_print_scripts( array( 'customize-base' ) );
456
457			$settings = array(
458				'messengerArgs' => array(
459					'channel' => $this->messenger_channel,
460					'url'     => wp_customize_url(),
461				),
462				'error'         => $ajax_message,
463			);
464			?>
465			<script>
466			( function( api, settings ) {
467				var preview = new api.Messenger( settings.messengerArgs );
468				preview.send( 'iframe-loading-error', settings.error );
469			} )( wp.customize, <?php echo wp_json_encode( $settings ); ?> );
470			</script>
471			<?php
472			$message .= ob_get_clean();
473		}
474
475		wp_die( $message );
476	}
477
478	/**
479	 * Return the Ajax wp_die() handler if it's a customized request.
480	 *
481	 * @since 3.4.0
482	 * @deprecated 4.7.0
483	 *
484	 * @return callable Die handler.
485	 */
486	public function wp_die_handler() {
487		_deprecated_function( __METHOD__, '4.7.0' );
488
489		if ( $this->doing_ajax() || isset( $_POST['customized'] ) ) {
490			return '_ajax_wp_die_handler';
491		}
492
493		return '_default_wp_die_handler';
494	}
495
496	/**
497	 * Start preview and customize theme.
498	 *
499	 * Check if customize query variable exist. Init filters to filter the current theme.
500	 *
501	 * @since 3.4.0
502	 *
503	 * @global string $pagenow
504	 */
505	public function setup_theme() {
506		global $pagenow;
507
508		// Check permissions for customize.php access since this method is called before customize.php can run any code.
509		if ( 'customize.php' === $pagenow && ! current_user_can( 'customize' ) ) {
510			if ( ! is_user_logged_in() ) {
511				auth_redirect();
512			} else {
513				wp_die(
514					'<h1>' . __( 'You need a higher level of permission.' ) . '</h1>' .
515					'<p>' . __( 'Sorry, you are not allowed to customize this site.' ) . '</p>',
516					403
517				);
518			}
519			return;
520		}
521
522		// If a changeset was provided is invalid.
523		if ( isset( $this->_changeset_uuid ) && false !== $this->_changeset_uuid && ! wp_is_uuid( $this->_changeset_uuid ) ) {
524			$this->wp_die( -1, __( 'Invalid changeset UUID' ) );
525		}
526
527		/*
528		 * Clear incoming post data if the user lacks a CSRF token (nonce). Note that the customizer
529		 * application will inject the customize_preview_nonce query parameter into all Ajax requests.
530		 * For similar behavior elsewhere in WordPress, see rest_cookie_check_errors() which logs out
531		 * a user when a valid nonce isn't present.
532		 */
533		$has_post_data_nonce = (
534			check_ajax_referer( 'preview-customize_' . $this->get_stylesheet(), 'nonce', false )
535			||
536			check_ajax_referer( 'save-customize_' . $this->get_stylesheet(), 'nonce', false )
537			||
538			check_ajax_referer( 'preview-customize_' . $this->get_stylesheet(), 'customize_preview_nonce', false )
539		);
540		if ( ! current_user_can( 'customize' ) || ! $has_post_data_nonce ) {
541			unset( $_POST['customized'] );
542			unset( $_REQUEST['customized'] );
543		}
544
545		/*
546		 * If unauthenticated then require a valid changeset UUID to load the preview.
547		 * In this way, the UUID serves as a secret key. If the messenger channel is present,
548		 * then send unauthenticated code to prompt re-auth.
549		 */
550		if ( ! current_user_can( 'customize' ) && ! $this->changeset_post_id() ) {
551			$this->wp_die( $this->messenger_channel ? 0 : -1, __( 'Non-existent changeset UUID.' ) );
552		}
553
554		if ( ! headers_sent() ) {
555			send_origin_headers();
556		}
557
558		// Hide the admin bar if we're embedded in the customizer iframe.
559		if ( $this->messenger_channel ) {
560			show_admin_bar( false );
561		}
562
563		if ( $this->is_theme_active() ) {
564			// Once the theme is loaded, we'll validate it.
565			add_action( 'after_setup_theme', array( $this, 'after_setup_theme' ) );
566		} else {
567			// If the requested theme is not the active theme and the user doesn't have
568			// the switch_themes cap, bail.
569			if ( ! current_user_can( 'switch_themes' ) ) {
570				$this->wp_die( -1, __( 'Sorry, you are not allowed to edit theme options on this site.' ) );
571			}
572
573			// If the theme has errors while loading, bail.
574			if ( $this->theme()->errors() ) {
575				$this->wp_die( -1, $this->theme()->errors()->get_error_message() );
576			}
577
578			// If the theme isn't allowed per multisite settings, bail.
579			if ( ! $this->theme()->is_allowed() ) {
580				$this->wp_die( -1, __( 'The requested theme does not exist.' ) );
581			}
582		}
583
584		// Make sure changeset UUID is established immediately after the theme is loaded.
585		add_action( 'after_setup_theme', array( $this, 'establish_loaded_changeset' ), 5 );
586
587		/*
588		 * Import theme starter content for fresh installations when landing in the customizer.
589		 * Import starter content at after_setup_theme:100 so that any
590		 * add_theme_support( 'starter-content' ) calls will have been made.
591		 */
592		if ( get_option( 'fresh_site' ) && 'customize.php' === $pagenow ) {
593			add_action( 'after_setup_theme', array( $this, 'import_theme_starter_content' ), 100 );
594		}
595
596		$this->start_previewing_theme();
597	}
598
599	/**
600	 * Establish the loaded changeset.
601	 *
602	 * This method runs right at after_setup_theme and applies the 'customize_changeset_branching' filter to determine
603	 * whether concurrent changesets are allowed. Then if the Customizer is not initialized with a `changeset_uuid` param,
604	 * this method will determine which UUID should be used. If changeset branching is disabled, then the most saved
605	 * changeset will be loaded by default. Otherwise, if there are no existing saved changesets or if changeset branching is
606	 * enabled, then a new UUID will be generated.
607	 *
608	 * @since 4.9.0
609	 *
610	 * @global string $pagenow
611	 */
612	public function establish_loaded_changeset() {
613		global $pagenow;
614
615		if ( empty( $this->_changeset_uuid ) ) {
616			$changeset_uuid = null;
617
618			if ( ! $this->branching() && $this->is_theme_active() ) {
619				$unpublished_changeset_posts = $this->get_changeset_posts(
620					array(
621						'post_status'               => array_diff( get_post_stati(), array( 'auto-draft', 'publish', 'trash', 'inherit', 'private' ) ),
622						'exclude_restore_dismissed' => false,
623						'author'                    => 'any',
624						'posts_per_page'            => 1,
625						'order'                     => 'DESC',
626						'orderby'                   => 'date',
627					)
628				);
629				$unpublished_changeset_post  = array_shift( $unpublished_changeset_posts );
630				if ( ! empty( $unpublished_changeset_post ) && wp_is_uuid( $unpublished_changeset_post->post_name ) ) {
631					$changeset_uuid = $unpublished_changeset_post->post_name;
632				}
633			}
634
635			// If no changeset UUID has been set yet, then generate a new one.
636			if ( empty( $changeset_uuid ) ) {
637				$changeset_uuid = wp_generate_uuid4();
638			}
639
640			$this->_changeset_uuid = $changeset_uuid;
641		}
642
643		if ( is_admin() && 'customize.php' === $pagenow ) {
644			$this->set_changeset_lock( $this->changeset_post_id() );
645		}
646	}
647
648	/**
649	 * Callback to validate a theme once it is loaded
650	 *
651	 * @since 3.4.0
652	 */
653	public function after_setup_theme() {
654		$doing_ajax_or_is_customized = ( $this->doing_ajax() || isset( $_POST['customized'] ) );
655		if ( ! $doing_ajax_or_is_customized && ! validate_current_theme() ) {
656			wp_redirect( 'themes.php?broken=true' );
657			exit;
658		}
659	}
660
661	/**
662	 * If the theme to be previewed isn't the active theme, add filter callbacks
663	 * to swap it out at runtime.
664	 *
665	 * @since 3.4.0
666	 */
667	public function start_previewing_theme() {
668		// Bail if we're already previewing.
669		if ( $this->is_preview() ) {
670			return;
671		}
672
673		$this->previewing = true;
674
675		if ( ! $this->is_theme_active() ) {
676			add_filter( 'template', array( $this, 'get_template' ) );
677			add_filter( 'stylesheet', array( $this, 'get_stylesheet' ) );
678			add_filter( 'pre_option_current_theme', array( $this, 'current_theme' ) );
679
680			// @link: https://core.trac.wordpress.org/ticket/20027
681			add_filter( 'pre_option_stylesheet', array( $this, 'get_stylesheet' ) );
682			add_filter( 'pre_option_template', array( $this, 'get_template' ) );
683
684			// Handle custom theme roots.
685			add_filter( 'pre_option_stylesheet_root', array( $this, 'get_stylesheet_root' ) );
686			add_filter( 'pre_option_template_root', array( $this, 'get_template_root' ) );
687		}
688
689		/**
690		 * Fires once the Customizer theme preview has started.
691		 *
692		 * @since 3.4.0
693		 *
694		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
695		 */
696		do_action( 'start_previewing_theme', $this );
697	}
698
699	/**
700	 * Stop previewing the selected theme.
701	 *
702	 * Removes filters to change the current theme.
703	 *
704	 * @since 3.4.0
705	 */
706	public function stop_previewing_theme() {
707		if ( ! $this->is_preview() ) {
708			return;
709		}
710
711		$this->previewing = false;
712
713		if ( ! $this->is_theme_active() ) {
714			remove_filter( 'template', array( $this, 'get_template' ) );
715			remove_filter( 'stylesheet', array( $this, 'get_stylesheet' ) );
716			remove_filter( 'pre_option_current_theme', array( $this, 'current_theme' ) );
717
718			// @link: https://core.trac.wordpress.org/ticket/20027
719			remove_filter( 'pre_option_stylesheet', array( $this, 'get_stylesheet' ) );
720			remove_filter( 'pre_option_template', array( $this, 'get_template' ) );
721
722			// Handle custom theme roots.
723			remove_filter( 'pre_option_stylesheet_root', array( $this, 'get_stylesheet_root' ) );
724			remove_filter( 'pre_option_template_root', array( $this, 'get_template_root' ) );
725		}
726
727		/**
728		 * Fires once the Customizer theme preview has stopped.
729		 *
730		 * @since 3.4.0
731		 *
732		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
733		 */
734		do_action( 'stop_previewing_theme', $this );
735	}
736
737	/**
738	 * Gets whether settings are or will be previewed.
739	 *
740	 * @since 4.9.0
741	 *
742	 * @see WP_Customize_Setting::preview()
743	 *
744	 * @return bool
745	 */
746	public function settings_previewed() {
747		return $this->settings_previewed;
748	}
749
750	/**
751	 * Gets whether data from a changeset's autosaved revision should be loaded if it exists.
752	 *
753	 * @since 4.9.0
754	 *
755	 * @see WP_Customize_Manager::changeset_data()
756	 *
757	 * @return bool Is using autosaved changeset revision.
758	 */
759	public function autosaved() {
760		return $this->autosaved;
761	}
762
763	/**
764	 * Whether the changeset branching is allowed.
765	 *
766	 * @since 4.9.0
767	 *
768	 * @see WP_Customize_Manager::establish_loaded_changeset()
769	 *
770	 * @return bool Is changeset branching.
771	 */
772	public function branching() {
773
774		/**
775		 * Filters whether or not changeset branching is allowed.
776		 *
777		 * By default in core, when changeset branching is not allowed, changesets will operate
778		 * linearly in that only one saved changeset will exist at a time (with a 'draft' or
779		 * 'future' status). This makes the Customizer operate in a way that is similar to going to
780		 * "edit" to one existing post: all users will be making changes to the same post, and autosave
781		 * revisions will be made for that post.
782		 *
783		 * By contrast, when changeset branching is allowed, then the model is like users going
784		 * to "add new" for a page and each user makes changes independently of each other since
785		 * they are all operating on their own separate pages, each getting their own separate
786		 * initial auto-drafts and then once initially saved, autosave revisions on top of that
787		 * user's specific post.
788		 *
789		 * Since linear changesets are deemed to be more suitable for the majority of WordPress users,
790		 * they are the default. For WordPress sites that have heavy site management in the Customizer
791		 * by multiple users then branching changesets should be enabled by means of this filter.
792		 *
793		 * @since 4.9.0
794		 *
795		 * @param bool                 $allow_branching Whether branching is allowed. If `false`, the default,
796		 *                                              then only one saved changeset exists at a time.
797		 * @param WP_Customize_Manager $wp_customize    Manager instance.
798		 */
799		$this->branching = apply_filters( 'customize_changeset_branching', $this->branching, $this );
800
801		return $this->branching;
802	}
803
804	/**
805	 * Get the changeset UUID.
806	 *
807	 * @since 4.7.0
808	 *
809	 * @see WP_Customize_Manager::establish_loaded_changeset()
810	 *
811	 * @return string UUID.
812	 */
813	public function changeset_uuid() {
814		if ( empty( $this->_changeset_uuid ) ) {
815			$this->establish_loaded_changeset();
816		}
817		return $this->_changeset_uuid;
818	}
819
820	/**
821	 * Get the theme being customized.
822	 *
823	 * @since 3.4.0
824	 *
825	 * @return WP_Theme
826	 */
827	public function theme() {
828		if ( ! $this->theme ) {
829			$this->theme = wp_get_theme();
830		}
831		return $this->theme;
832	}
833
834	/**
835	 * Get the registered settings.
836	 *
837	 * @since 3.4.0
838	 *
839	 * @return array
840	 */
841	public function settings() {
842		return $this->settings;
843	}
844
845	/**
846	 * Get the registered controls.
847	 *
848	 * @since 3.4.0
849	 *
850	 * @return array
851	 */
852	public function controls() {
853		return $this->controls;
854	}
855
856	/**
857	 * Get the registered containers.
858	 *
859	 * @since 4.0.0
860	 *
861	 * @return array
862	 */
863	public function containers() {
864		return $this->containers;
865	}
866
867	/**
868	 * Get the registered sections.
869	 *
870	 * @since 3.4.0
871	 *
872	 * @return array
873	 */
874	public function sections() {
875		return $this->sections;
876	}
877
878	/**
879	 * Get the registered panels.
880	 *
881	 * @since 4.0.0
882	 *
883	 * @return array Panels.
884	 */
885	public function panels() {
886		return $this->panels;
887	}
888
889	/**
890	 * Checks if the current theme is active.
891	 *
892	 * @since 3.4.0
893	 *
894	 * @return bool
895	 */
896	public function is_theme_active() {
897		return $this->get_stylesheet() === $this->original_stylesheet;
898	}
899
900	/**
901	 * Register styles/scripts and initialize the preview of each setting
902	 *
903	 * @since 3.4.0
904	 */
905	public function wp_loaded() {
906
907		// Unconditionally register core types for panels, sections, and controls
908		// in case plugin unhooks all customize_register actions.
909		$this->register_panel_type( 'WP_Customize_Panel' );
910		$this->register_panel_type( 'WP_Customize_Themes_Panel' );
911		$this->register_section_type( 'WP_Customize_Section' );
912		$this->register_section_type( 'WP_Customize_Sidebar_Section' );
913		$this->register_section_type( 'WP_Customize_Themes_Section' );
914		$this->register_control_type( 'WP_Customize_Color_Control' );
915		$this->register_control_type( 'WP_Customize_Media_Control' );
916		$this->register_control_type( 'WP_Customize_Upload_Control' );
917		$this->register_control_type( 'WP_Customize_Image_Control' );
918		$this->register_control_type( 'WP_Customize_Background_Image_Control' );
919		$this->register_control_type( 'WP_Customize_Background_Position_Control' );
920		$this->register_control_type( 'WP_Customize_Cropped_Image_Control' );
921		$this->register_control_type( 'WP_Customize_Site_Icon_Control' );
922		$this->register_control_type( 'WP_Customize_Theme_Control' );
923		$this->register_control_type( 'WP_Customize_Code_Editor_Control' );
924		$this->register_control_type( 'WP_Customize_Date_Time_Control' );
925
926		/**
927		 * Fires once WordPress has loaded, allowing scripts and styles to be initialized.
928		 *
929		 * @since 3.4.0
930		 *
931		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
932		 */
933		do_action( 'customize_register', $this );
934
935		if ( $this->settings_previewed() ) {
936			foreach ( $this->settings as $setting ) {
937				$setting->preview();
938			}
939		}
940
941		if ( $this->is_preview() && ! is_admin() ) {
942			$this->customize_preview_init();
943		}
944	}
945
946	/**
947	 * Prevents Ajax requests from following redirects when previewing a theme
948	 * by issuing a 200 response instead of a 30x.
949	 *
950	 * Instead, the JS will sniff out the location header.
951	 *
952	 * @since 3.4.0
953	 * @deprecated 4.7.0
954	 *
955	 * @param int $status Status.
956	 * @return int
957	 */
958	public function wp_redirect_status( $status ) {
959		_deprecated_function( __FUNCTION__, '4.7.0' );
960
961		if ( $this->is_preview() && ! is_admin() ) {
962			return 200;
963		}
964
965		return $status;
966	}
967
968	/**
969	 * Find the changeset post ID for a given changeset UUID.
970	 *
971	 * @since 4.7.0
972	 *
973	 * @param string $uuid Changeset UUID.
974	 * @return int|null Returns post ID on success and null on failure.
975	 */
976	public function find_changeset_post_id( $uuid ) {
977		$cache_group       = 'customize_changeset_post';
978		$changeset_post_id = wp_cache_get( $uuid, $cache_group );
979		if ( $changeset_post_id && 'customize_changeset' === get_post_type( $changeset_post_id ) ) {
980			return $changeset_post_id;
981		}
982
983		$changeset_post_query = new WP_Query(
984			array(
985				'post_type'              => 'customize_changeset',
986				'post_status'            => get_post_stati(),
987				'name'                   => $uuid,
988				'posts_per_page'         => 1,
989				'no_found_rows'          => true,
990				'cache_results'          => true,
991				'update_post_meta_cache' => false,
992				'update_post_term_cache' => false,
993				'lazy_load_term_meta'    => false,
994			)
995		);
996		if ( ! empty( $changeset_post_query->posts ) ) {
997			// Note: 'fields'=>'ids' is not being used in order to cache the post object as it will be needed.
998			$changeset_post_id = $changeset_post_query->posts[0]->ID;
999			wp_cache_set( $uuid, $changeset_post_id, $cache_group );
1000			return $changeset_post_id;
1001		}
1002
1003		return null;
1004	}
1005
1006	/**
1007	 * Get changeset posts.
1008	 *
1009	 * @since 4.9.0
1010	 *
1011	 * @param array $args {
1012	 *     Args to pass into `get_posts()` to query changesets.
1013	 *
1014	 *     @type int    $posts_per_page             Number of posts to return. Defaults to -1 (all posts).
1015	 *     @type int    $author                     Post author. Defaults to current user.
1016	 *     @type string $post_status                Status of changeset. Defaults to 'auto-draft'.
1017	 *     @type bool   $exclude_restore_dismissed  Whether to exclude changeset auto-drafts that have been dismissed. Defaults to true.
1018	 * }
1019	 * @return WP_Post[] Auto-draft changesets.
1020	 */
1021	protected function get_changeset_posts( $args = array() ) {
1022		$default_args = array(
1023			'exclude_restore_dismissed' => true,
1024			'posts_per_page'            => -1,
1025			'post_type'                 => 'customize_changeset',
1026			'post_status'               => 'auto-draft',
1027			'order'                     => 'DESC',
1028			'orderby'                   => 'date',
1029			'no_found_rows'             => true,
1030			'cache_results'             => true,
1031			'update_post_meta_cache'    => false,
1032			'update_post_term_cache'    => false,
1033			'lazy_load_term_meta'       => false,
1034		);
1035		if ( get_current_user_id() ) {
1036			$default_args['author'] = get_current_user_id();
1037		}
1038		$args = array_merge( $default_args, $args );
1039
1040		if ( ! empty( $args['exclude_restore_dismissed'] ) ) {
1041			unset( $args['exclude_restore_dismissed'] );
1042			$args['meta_query'] = array(
1043				array(
1044					'key'     => '_customize_restore_dismissed',
1045					'compare' => 'NOT EXISTS',
1046				),
1047			);
1048		}
1049
1050		return get_posts( $args );
1051	}
1052
1053	/**
1054	 * Dismiss all of the current user's auto-drafts (other than the present one).
1055	 *
1056	 * @since 4.9.0
1057	 * @return int The number of auto-drafts that were dismissed.
1058	 */
1059	protected function dismiss_user_auto_draft_changesets() {
1060		$changeset_autodraft_posts = $this->get_changeset_posts(
1061			array(
1062				'post_status'               => 'auto-draft',
1063				'exclude_restore_dismissed' => true,
1064				'posts_per_page'            => -1,
1065			)
1066		);
1067		$dismissed                 = 0;
1068		foreach ( $changeset_autodraft_posts as $autosave_autodraft_post ) {
1069			if ( $autosave_autodraft_post->ID === $this->changeset_post_id() ) {
1070				continue;
1071			}
1072			if ( update_post_meta( $autosave_autodraft_post->ID, '_customize_restore_dismissed', true ) ) {
1073				$dismissed++;
1074			}
1075		}
1076		return $dismissed;
1077	}
1078
1079	/**
1080	 * Get the changeset post ID for the loaded changeset.
1081	 *
1082	 * @since 4.7.0
1083	 *
1084	 * @return int|null Post ID on success or null if there is no post yet saved.
1085	 */
1086	public function changeset_post_id() {
1087		if ( ! isset( $this->_changeset_post_id ) ) {
1088			$post_id = $this->find_changeset_post_id( $this->changeset_uuid() );
1089			if ( ! $post_id ) {
1090				$post_id = false;
1091			}
1092			$this->_changeset_post_id = $post_id;
1093		}
1094		if ( false === $this->_changeset_post_id ) {
1095			return null;
1096		}
1097		return $this->_changeset_post_id;
1098	}
1099
1100	/**
1101	 * Get the data stored in a changeset post.
1102	 *
1103	 * @since 4.7.0
1104	 *
1105	 * @param int $post_id Changeset post ID.
1106	 * @return array|WP_Error Changeset data or WP_Error on error.
1107	 */
1108	protected function get_changeset_post_data( $post_id ) {
1109		if ( ! $post_id ) {
1110			return new WP_Error( 'empty_post_id' );
1111		}
1112		$changeset_post = get_post( $post_id );
1113		if ( ! $changeset_post ) {
1114			return new WP_Error( 'missing_post' );
1115		}
1116		if ( 'revision' === $changeset_post->post_type ) {
1117			if ( 'customize_changeset' !== get_post_type( $changeset_post->post_parent ) ) {
1118				return new WP_Error( 'wrong_post_type' );
1119			}
1120		} elseif ( 'customize_changeset' !== $changeset_post->post_type ) {
1121			return new WP_Error( 'wrong_post_type' );
1122		}
1123		$changeset_data = json_decode( $changeset_post->post_content, true );
1124		$last_error     = json_last_error();
1125		if ( $last_error ) {
1126			return new WP_Error( 'json_parse_error', '', $last_error );
1127		}
1128		if ( ! is_array( $changeset_data ) ) {
1129			return new WP_Error( 'expected_array' );
1130		}
1131		return $changeset_data;
1132	}
1133
1134	/**
1135	 * Get changeset data.
1136	 *
1137	 * @since 4.7.0
1138	 * @since 4.9.0 This will return the changeset's data with a user's autosave revision merged on top, if one exists and $autosaved is true.
1139	 *
1140	 * @return array Changeset data.
1141	 */
1142	public function changeset_data() {
1143		if ( isset( $this->_changeset_data ) ) {
1144			return $this->_changeset_data;
1145		}
1146		$changeset_post_id = $this->changeset_post_id();
1147		if ( ! $changeset_post_id ) {
1148			$this->_changeset_data = array();
1149		} else {
1150			if ( $this->autosaved() && is_user_logged_in() ) {
1151				$autosave_post = wp_get_post_autosave( $changeset_post_id, get_current_user_id() );
1152				if ( $autosave_post ) {
1153					$data = $this->get_changeset_post_data( $autosave_post->ID );
1154					if ( ! is_wp_error( $data ) ) {
1155						$this->_changeset_data = $data;
1156					}
1157				}
1158			}
1159
1160			// Load data from the changeset if it was not loaded from an autosave.
1161			if ( ! isset( $this->_changeset_data ) ) {
1162				$data = $this->get_changeset_post_data( $changeset_post_id );
1163				if ( ! is_wp_error( $data ) ) {
1164					$this->_changeset_data = $data;
1165				} else {
1166					$this->_changeset_data = array();
1167				}
1168			}
1169		}
1170		return $this->_changeset_data;
1171	}
1172
1173	/**
1174	 * Starter content setting IDs.
1175	 *
1176	 * @since 4.7.0
1177	 * @var array
1178	 */
1179	protected $pending_starter_content_settings_ids = array();
1180
1181	/**
1182	 * Import theme starter content into the customized state.
1183	 *
1184	 * @since 4.7.0
1185	 *
1186	 * @param array $starter_content Starter content. Defaults to `get_theme_starter_content()`.
1187	 */
1188	function import_theme_starter_content( $starter_content = array() ) {
1189		if ( empty( $starter_content ) ) {
1190			$starter_content = get_theme_starter_content();
1191		}
1192
1193		$changeset_data = array();
1194		if ( $this->changeset_post_id() ) {
1195			/*
1196			 * Don't re-import starter content into a changeset saved persistently.
1197			 * This will need to be revisited in the future once theme switching
1198			 * is allowed with drafted/scheduled changesets, since switching to
1199			 * another theme could result in more starter content being applied.
1200			 * However, when doing an explicit save it is currently possible for
1201			 * nav menus and nav menu items specifically to lose their starter_content
1202			 * flags, thus resulting in duplicates being created since they fail
1203			 * to get re-used. See #40146.
1204			 */
1205			if ( 'auto-draft' !== get_post_status( $this->changeset_post_id() ) ) {
1206				return;
1207			}
1208
1209			$changeset_data = $this->get_changeset_post_data( $this->changeset_post_id() );
1210		}
1211
1212		$sidebars_widgets = isset( $starter_content['widgets'] ) && ! empty( $this->widgets ) ? $starter_content['widgets'] : array();
1213		$attachments      = isset( $starter_content['attachments'] ) && ! empty( $this->nav_menus ) ? $starter_content['attachments'] : array();
1214		$posts            = isset( $starter_content['posts'] ) && ! empty( $this->nav_menus ) ? $starter_content['posts'] : array();
1215		$options          = isset( $starter_content['options'] ) ? $starter_content['options'] : array();
1216		$nav_menus        = isset( $starter_content['nav_menus'] ) && ! empty( $this->nav_menus ) ? $starter_content['nav_menus'] : array();
1217		$theme_mods       = isset( $starter_content['theme_mods'] ) ? $starter_content['theme_mods'] : array();
1218
1219		// Widgets.
1220		$max_widget_numbers = array();
1221		foreach ( $sidebars_widgets as $sidebar_id => $widgets ) {
1222			$sidebar_widget_ids = array();
1223			foreach ( $widgets as $widget ) {
1224				list( $id_base, $instance ) = $widget;
1225
1226				if ( ! isset( $max_widget_numbers[ $id_base ] ) ) {
1227
1228					// When $settings is an array-like object, get an intrinsic array for use with array_keys().
1229					$settings = get_option( "widget_{$id_base}", array() );
1230					if ( $settings instanceof ArrayObject || $settings instanceof ArrayIterator ) {
1231						$settings = $settings->getArrayCopy();
1232					}
1233
1234					unset( $settings['_multiwidget'] );
1235
1236					// Find the max widget number for this type.
1237					$widget_numbers = array_keys( $settings );
1238					if ( count( $widget_numbers ) > 0 ) {
1239						$widget_numbers[]               = 1;
1240						$max_widget_numbers[ $id_base ] = max( ...$widget_numbers );
1241					} else {
1242						$max_widget_numbers[ $id_base ] = 1;
1243					}
1244				}
1245				$max_widget_numbers[ $id_base ] += 1;
1246
1247				$widget_id  = sprintf( '%s-%d', $id_base, $max_widget_numbers[ $id_base ] );
1248				$setting_id = sprintf( 'widget_%s[%d]', $id_base, $max_widget_numbers[ $id_base ] );
1249
1250				$setting_value = $this->widgets->sanitize_widget_js_instance( $instance );
1251				if ( empty( $changeset_data[ $setting_id ] ) || ! empty( $changeset_data[ $setting_id ]['starter_content'] ) ) {
1252					$this->set_post_value( $setting_id, $setting_value );
1253					$this->pending_starter_content_settings_ids[] = $setting_id;
1254				}
1255				$sidebar_widget_ids[] = $widget_id;
1256			}
1257
1258			$setting_id = sprintf( 'sidebars_widgets[%s]', $sidebar_id );
1259			if ( empty( $changeset_data[ $setting_id ] ) || ! empty( $changeset_data[ $setting_id ]['starter_content'] ) ) {
1260				$this->set_post_value( $setting_id, $sidebar_widget_ids );
1261				$this->pending_starter_content_settings_ids[] = $setting_id;
1262			}
1263		}
1264
1265		$starter_content_auto_draft_post_ids = array();
1266		if ( ! empty( $changeset_data['nav_menus_created_posts']['value'] ) ) {
1267			$starter_content_auto_draft_post_ids = array_merge( $starter_content_auto_draft_post_ids, $changeset_data['nav_menus_created_posts']['value'] );
1268		}
1269
1270		// Make an index of all the posts needed and what their slugs are.
1271		$needed_posts = array();
1272		$attachments  = $this->prepare_starter_content_attachments( $attachments );
1273		foreach ( $attachments as $attachment ) {
1274			$key                  = 'attachment:' . $attachment['post_name'];
1275			$needed_posts[ $key ] = true;
1276		}
1277		foreach ( array_keys( $posts ) as $post_symbol ) {
1278			if ( empty( $posts[ $post_symbol ]['post_name'] ) && empty( $posts[ $post_symbol ]['post_title'] ) ) {
1279				unset( $posts[ $post_symbol ] );
1280				continue;
1281			}
1282			if ( empty( $posts[ $post_symbol ]['post_name'] ) ) {
1283				$posts[ $post_symbol ]['post_name'] = sanitize_title( $posts[ $post_symbol ]['post_title'] );
1284			}
1285			if ( empty( $posts[ $post_symbol ]['post_type'] ) ) {
1286				$posts[ $post_symbol ]['post_type'] = 'post';
1287			}
1288			$needed_posts[ $posts[ $post_symbol ]['post_type'] . ':' . $posts[ $post_symbol ]['post_name'] ] = true;
1289		}
1290		$all_post_slugs = array_merge(
1291			wp_list_pluck( $attachments, 'post_name' ),
1292			wp_list_pluck( $posts, 'post_name' )
1293		);
1294
1295		/*
1296		 * Obtain all post types referenced in starter content to use in query.
1297		 * This is needed because 'any' will not account for post types not yet registered.
1298		 */
1299		$post_types = array_filter( array_merge( array( 'attachment' ), wp_list_pluck( $posts, 'post_type' ) ) );
1300
1301		// Re-use auto-draft starter content posts referenced in the current customized state.
1302		$existing_starter_content_posts = array();
1303		if ( ! empty( $starter_content_auto_draft_post_ids ) ) {
1304			$existing_posts_query = new WP_Query(
1305				array(
1306					'post__in'       => $starter_content_auto_draft_post_ids,
1307					'post_status'    => 'auto-draft',
1308					'post_type'      => $post_types,
1309					'posts_per_page' => -1,
1310				)
1311			);
1312			foreach ( $existing_posts_query->posts as $existing_post ) {
1313				$post_name = $existing_post->post_name;
1314				if ( empty( $post_name ) ) {
1315					$post_name = get_post_meta( $existing_post->ID, '_customize_draft_post_name', true );
1316				}
1317				$existing_starter_content_posts[ $existing_post->post_type . ':' . $post_name ] = $existing_post;
1318			}
1319		}
1320
1321		// Re-use non-auto-draft posts.
1322		if ( ! empty( $all_post_slugs ) ) {
1323			$existing_posts_query = new WP_Query(
1324				array(
1325					'post_name__in'  => $all_post_slugs,
1326					'post_status'    => array_diff( get_post_stati(), array( 'auto-draft' ) ),
1327					'post_type'      => 'any',
1328					'posts_per_page' => -1,
1329				)
1330			);
1331			foreach ( $existing_posts_query->posts as $existing_post ) {
1332				$key = $existing_post->post_type . ':' . $existing_post->post_name;
1333				if ( isset( $needed_posts[ $key ] ) && ! isset( $existing_starter_content_posts[ $key ] ) ) {
1334					$existing_starter_content_posts[ $key ] = $existing_post;
1335				}
1336			}
1337		}
1338
1339		// Attachments are technically posts but handled differently.
1340		if ( ! empty( $attachments ) ) {
1341
1342			$attachment_ids = array();
1343
1344			foreach ( $attachments as $symbol => $attachment ) {
1345				$file_array    = array(
1346					'name' => $attachment['file_name'],
1347				);
1348				$file_path     = $attachment['file_path'];
1349				$attachment_id = null;
1350				$attached_file = null;
1351				if ( isset( $existing_starter_content_posts[ 'attachment:' . $attachment['post_name'] ] ) ) {
1352					$attachment_post = $existing_starter_content_posts[ 'attachment:' . $attachment['post_name'] ];
1353					$attachment_id   = $attachment_post->ID;
1354					$attached_file   = get_attached_file( $attachment_id );
1355					if ( empty( $attached_file ) || ! file_exists( $attached_file ) ) {
1356						$attachment_id = null;
1357						$attached_file = null;
1358					} elseif ( $this->get_stylesheet() !== get_post_meta( $attachment_post->ID, '_starter_content_theme', true ) ) {
1359
1360						// Re-generate attachment metadata since it was previously generated for a different theme.
1361						$metadata = wp_generate_attachment_metadata( $attachment_post->ID, $attached_file );
1362						wp_update_attachment_metadata( $attachment_id, $metadata );
1363						update_post_meta( $attachment_id, '_starter_content_theme', $this->get_stylesheet() );
1364					}
1365				}
1366
1367				// Insert the attachment auto-draft because it doesn't yet exist or the attached file is gone.
1368				if ( ! $attachment_id ) {
1369
1370					// Copy file to temp location so that original file won't get deleted from theme after sideloading.
1371					$temp_file_name = wp_tempnam( wp_basename( $file_path ) );
1372					if ( $temp_file_name && copy( $file_path, $temp_file_name ) ) {
1373						$file_array['tmp_name'] = $temp_file_name;
1374					}
1375					if ( empty( $file_array['tmp_name'] ) ) {
1376						continue;
1377					}
1378
1379					$attachment_post_data = array_merge(
1380						wp_array_slice_assoc( $attachment, array( 'post_title', 'post_content', 'post_excerpt' ) ),
1381						array(
1382							'post_status' => 'auto-draft', // So attachment will be garbage collected in a week if changeset is never published.
1383						)
1384					);
1385
1386					$attachment_id = media_handle_sideload( $file_array, 0, null, $attachment_post_data );
1387					if ( is_wp_error( $attachment_id ) ) {
1388						continue;
1389					}
1390					update_post_meta( $attachment_id, '_starter_content_theme', $this->get_stylesheet() );
1391					update_post_meta( $attachment_id, '_customize_draft_post_name', $attachment['post_name'] );
1392				}
1393
1394				$attachment_ids[ $symbol ] = $attachment_id;
1395			}
1396			$starter_content_auto_draft_post_ids = array_merge( $starter_content_auto_draft_post_ids, array_values( $attachment_ids ) );
1397		}
1398
1399		// Posts & pages.
1400		if ( ! empty( $posts ) ) {
1401			foreach ( array_keys( $posts ) as $post_symbol ) {
1402				if ( empty( $posts[ $post_symbol ]['post_type'] ) || empty( $posts[ $post_symbol ]['post_name'] ) ) {
1403					continue;
1404				}
1405				$post_type = $posts[ $post_symbol ]['post_type'];
1406				if ( ! empty( $posts[ $post_symbol ]['post_name'] ) ) {
1407					$post_name = $posts[ $post_symbol ]['post_name'];
1408				} elseif ( ! empty( $posts[ $post_symbol ]['post_title'] ) ) {
1409					$post_name = sanitize_title( $posts[ $post_symbol ]['post_title'] );
1410				} else {
1411					continue;
1412				}
1413
1414				// Use existing auto-draft post if one already exists with the same type and name.
1415				if ( isset( $existing_starter_content_posts[ $post_type . ':' . $post_name ] ) ) {
1416					$posts[ $post_symbol ]['ID'] = $existing_starter_content_posts[ $post_type . ':' . $post_name ]->ID;
1417					continue;
1418				}
1419
1420				// Translate the featured image symbol.
1421				if ( ! empty( $posts[ $post_symbol ]['thumbnail'] )
1422					&& preg_match( '/^{{(?P<symbol>.+)}}$/', $posts[ $post_symbol ]['thumbnail'], $matches )
1423					&& isset( $attachment_ids[ $matches['symbol'] ] ) ) {
1424					$posts[ $post_symbol ]['meta_input']['_thumbnail_id'] = $attachment_ids[ $matches['symbol'] ];
1425				}
1426
1427				if ( ! empty( $posts[ $post_symbol ]['template'] ) ) {
1428					$posts[ $post_symbol ]['meta_input']['_wp_page_template'] = $posts[ $post_symbol ]['template'];
1429				}
1430
1431				$r = $this->nav_menus->insert_auto_draft_post( $posts[ $post_symbol ] );
1432				if ( $r instanceof WP_Post ) {
1433					$posts[ $post_symbol ]['ID'] = $r->ID;
1434				}
1435			}
1436
1437			$starter_content_auto_draft_post_ids = array_merge( $starter_content_auto_draft_post_ids, wp_list_pluck( $posts, 'ID' ) );
1438		}
1439
1440		// The nav_menus_created_posts setting is why nav_menus component is dependency for adding posts.
1441		if ( ! empty( $this->nav_menus ) && ! empty( $starter_content_auto_draft_post_ids ) ) {
1442			$setting_id = 'nav_menus_created_posts';
1443			$this->set_post_value( $setting_id, array_unique( array_values( $starter_content_auto_draft_post_ids ) ) );
1444			$this->pending_starter_content_settings_ids[] = $setting_id;
1445		}
1446
1447		// Nav menus.
1448		$placeholder_id              = -1;
1449		$reused_nav_menu_setting_ids = array();
1450		foreach ( $nav_menus as $nav_menu_location => $nav_menu ) {
1451
1452			$nav_menu_term_id    = null;
1453			$nav_menu_setting_id = null;
1454			$matches             = array();
1455
1456			// Look for an existing placeholder menu with starter content to re-use.
1457			foreach ( $changeset_data as $setting_id => $setting_params ) {
1458				$can_reuse = (
1459					! empty( $setting_params['starter_content'] )
1460					&&
1461					! in_array( $setting_id, $reused_nav_menu_setting_ids, true )
1462					&&
1463					preg_match( '#^nav_menu\[(?P<nav_menu_id>-?\d+)\]$#', $setting_id, $matches )
1464				);
1465				if ( $can_reuse ) {
1466					$nav_menu_term_id              = (int) $matches['nav_menu_id'];
1467					$nav_menu_setting_id           = $setting_id;
1468					$reused_nav_menu_setting_ids[] = $setting_id;
1469					break;
1470				}
1471			}
1472
1473			if ( ! $nav_menu_term_id ) {
1474				while ( isset( $changeset_data[ sprintf( 'nav_menu[%d]', $placeholder_id ) ] ) ) {
1475					$placeholder_id--;
1476				}
1477				$nav_menu_term_id    = $placeholder_id;
1478				$nav_menu_setting_id = sprintf( 'nav_menu[%d]', $placeholder_id );
1479			}
1480
1481			$this->set_post_value(
1482				$nav_menu_setting_id,
1483				array(
1484					'name' => isset( $nav_menu['name'] ) ? $nav_menu['name'] : $nav_menu_location,
1485				)
1486			);
1487			$this->pending_starter_content_settings_ids[] = $nav_menu_setting_id;
1488
1489			// @todo Add support for menu_item_parent.
1490			$position = 0;
1491			foreach ( $nav_menu['items'] as $nav_menu_item ) {
1492				$nav_menu_item_setting_id = sprintf( 'nav_menu_item[%d]', $placeholder_id-- );
1493				if ( ! isset( $nav_menu_item['position'] ) ) {
1494					$nav_menu_item['position'] = $position++;
1495				}
1496				$nav_menu_item['nav_menu_term_id'] = $nav_menu_term_id;
1497
1498				if ( isset( $nav_menu_item['object_id'] ) ) {
1499					if ( 'post_type' === $nav_menu_item['type'] && preg_match( '/^{{(?P<symbol>.+)}}$/', $nav_menu_item['object_id'], $matches ) && isset( $posts[ $matches['symbol'] ] ) ) {
1500						$nav_menu_item['object_id'] = $posts[ $matches['symbol'] ]['ID'];
1501						if ( empty( $nav_menu_item['title'] ) ) {
1502							$original_object        = get_post( $nav_menu_item['object_id'] );
1503							$nav_menu_item['title'] = $original_object->post_title;
1504						}
1505					} else {
1506						continue;
1507					}
1508				} else {
1509					$nav_menu_item['object_id'] = 0;
1510				}
1511
1512				if ( empty( $changeset_data[ $nav_menu_item_setting_id ] ) || ! empty( $changeset_data[ $nav_menu_item_setting_id ]['starter_content'] ) ) {
1513					$this->set_post_value( $nav_menu_item_setting_id, $nav_menu_item );
1514					$this->pending_starter_content_settings_ids[] = $nav_menu_item_setting_id;
1515				}
1516			}
1517
1518			$setting_id = sprintf( 'nav_menu_locations[%s]', $nav_menu_location );
1519			if ( empty( $changeset_data[ $setting_id ] ) || ! empty( $changeset_data[ $setting_id ]['starter_content'] ) ) {
1520				$this->set_post_value( $setting_id, $nav_menu_term_id );
1521				$this->pending_starter_content_settings_ids[] = $setting_id;
1522			}
1523		}
1524
1525		// Options.
1526		foreach ( $options as $name => $value ) {
1527
1528			// Serialize the value to check for post symbols.
1529			$value = maybe_serialize( $value );
1530
1531			if ( is_serialized( $value ) ) {
1532				if ( preg_match( '/s:\d+:"{{(?P<symbol>.+)}}"/', $value, $matches ) ) {
1533					if ( isset( $posts[ $matches['symbol'] ] ) ) {
1534						$symbol_match = $posts[ $matches['symbol'] ]['ID'];
1535					} elseif ( isset( $attachment_ids[ $matches['symbol'] ] ) ) {
1536						$symbol_match = $attachment_ids[ $matches['symbol'] ];
1537					}
1538
1539					// If we have any symbol matches, update the values.
1540					if ( isset( $symbol_match ) ) {
1541						// Replace found string matches with post IDs.
1542						$value = str_replace( $matches[0], "i:{$symbol_match}", $value );
1543					} else {
1544						continue;
1545					}
1546				}
1547			} elseif ( preg_match( '/^{{(?P<symbol>.+)}}$/', $value, $matches ) ) {
1548				if ( isset( $posts[ $matches['symbol'] ] ) ) {
1549					$value = $posts[ $matches['symbol'] ]['ID'];
1550				} elseif ( isset( $attachment_ids[ $matches['symbol'] ] ) ) {
1551					$value = $attachment_ids[ $matches['symbol'] ];
1552				} else {
1553					continue;
1554				}
1555			}
1556
1557			// Unserialize values after checking for post symbols, so they can be properly referenced.
1558			$value = maybe_unserialize( $value );
1559
1560			if ( empty( $changeset_data[ $name ] ) || ! empty( $changeset_data[ $name ]['starter_content'] ) ) {
1561				$this->set_post_value( $name, $value );
1562				$this->pending_starter_content_settings_ids[] = $name;
1563			}
1564		}
1565
1566		// Theme mods.
1567		foreach ( $theme_mods as $name => $value ) {
1568
1569			// Serialize the value to check for post symbols.
1570			$value = maybe_serialize( $value );
1571
1572			// Check if value was serialized.
1573			if ( is_serialized( $value ) ) {
1574				if ( preg_match( '/s:\d+:"{{(?P<symbol>.+)}}"/', $value, $matches ) ) {
1575					if ( isset( $posts[ $matches['symbol'] ] ) ) {
1576						$symbol_match = $posts[ $matches['symbol'] ]['ID'];
1577					} elseif ( isset( $attachment_ids[ $matches['symbol'] ] ) ) {
1578						$symbol_match = $attachment_ids[ $matches['symbol'] ];
1579					}
1580
1581					// If we have any symbol matches, update the values.
1582					if ( isset( $symbol_match ) ) {
1583						// Replace found string matches with post IDs.
1584						$value = str_replace( $matches[0], "i:{$symbol_match}", $value );
1585					} else {
1586						continue;
1587					}
1588				}
1589			} elseif ( preg_match( '/^{{(?P<symbol>.+)}}$/', $value, $matches ) ) {
1590				if ( isset( $posts[ $matches['symbol'] ] ) ) {
1591					$value = $posts[ $matches['symbol'] ]['ID'];
1592				} elseif ( isset( $attachment_ids[ $matches['symbol'] ] ) ) {
1593					$value = $attachment_ids[ $matches['symbol'] ];
1594				} else {
1595					continue;
1596				}
1597			}
1598
1599			// Unserialize values after checking for post symbols, so they can be properly referenced.
1600			$value = maybe_unserialize( $value );
1601
1602			// Handle header image as special case since setting has a legacy format.
1603			if ( 'header_image' === $name ) {
1604				$name     = 'header_image_data';
1605				$metadata = wp_get_attachment_metadata( $value );
1606				if ( empty( $metadata ) ) {
1607					continue;
1608				}
1609				$value = array(
1610					'attachment_id' => $value,
1611					'url'           => wp_get_attachment_url( $value ),
1612					'height'        => $metadata['height'],
1613					'width'         => $metadata['width'],
1614				);
1615			} elseif ( 'background_image' === $name ) {
1616				$value = wp_get_attachment_url( $value );
1617			}
1618
1619			if ( empty( $changeset_data[ $name ] ) || ! empty( $changeset_data[ $name ]['starter_content'] ) ) {
1620				$this->set_post_value( $name, $value );
1621				$this->pending_starter_content_settings_ids[] = $name;
1622			}
1623		}
1624
1625		if ( ! empty( $this->pending_starter_content_settings_ids ) ) {
1626			if ( did_action( 'customize_register' ) ) {
1627				$this->_save_starter_content_changeset();
1628			} else {
1629				add_action( 'customize_register', array( $this, '_save_starter_content_changeset' ), 1000 );
1630			}
1631		}
1632	}
1633
1634	/**
1635	 * Prepare starter content attachments.
1636	 *
1637	 * Ensure that the attachments are valid and that they have slugs and file name/path.
1638	 *
1639	 * @since 4.7.0
1640	 *
1641	 * @param array $attachments Attachments.
1642	 * @return array Prepared attachments.
1643	 */
1644	protected function prepare_starter_content_attachments( $attachments ) {
1645		$prepared_attachments = array();
1646		if ( empty( $attachments ) ) {
1647			return $prepared_attachments;
1648		}
1649
1650		// Such is The WordPress Way.
1651		require_once ABSPATH . 'wp-admin/includes/file.php';
1652		require_once ABSPATH . 'wp-admin/includes/media.php';
1653		require_once ABSPATH . 'wp-admin/includes/image.php';
1654
1655		foreach ( $attachments as $symbol => $attachment ) {
1656
1657			// A file is required and URLs to files are not currently allowed.
1658			if ( empty( $attachment['file'] ) || preg_match( '#^https?://$#', $attachment['file'] ) ) {
1659				continue;
1660			}
1661
1662			$file_path = null;
1663			if ( file_exists( $attachment['file'] ) ) {
1664				$file_path = $attachment['file']; // Could be absolute path to file in plugin.
1665			} elseif ( is_child_theme() && file_exists( get_stylesheet_directory() . '/' . $attachment['file'] ) ) {
1666				$file_path = get_stylesheet_directory() . '/' . $attachment['file'];
1667			} elseif ( file_exists( get_template_directory() . '/' . $attachment['file'] ) ) {
1668				$file_path = get_template_directory() . '/' . $attachment['file'];
1669			} else {
1670				continue;
1671			}
1672			$file_name = wp_basename( $attachment['file'] );
1673
1674			// Skip file types that are not recognized.
1675			$checked_filetype = wp_check_filetype( $file_name );
1676			if ( empty( $checked_filetype['type'] ) ) {
1677				continue;
1678			}
1679
1680			// Ensure post_name is set since not automatically derived from post_title for new auto-draft posts.
1681			if ( empty( $attachment['post_name'] ) ) {
1682				if ( ! empty( $attachment['post_title'] ) ) {
1683					$attachment['post_name'] = sanitize_title( $attachment['post_title'] );
1684				} else {
1685					$attachment['post_name'] = sanitize_title( preg_replace( '/\.\w+$/', '', $file_name ) );
1686				}
1687			}
1688
1689			$attachment['file_name']         = $file_name;
1690			$attachment['file_path']         = $file_path;
1691			$prepared_attachments[ $symbol ] = $attachment;
1692		}
1693		return $prepared_attachments;
1694	}
1695
1696	/**
1697	 * Save starter content changeset.
1698	 *
1699	 * @since 4.7.0
1700	 */
1701	public function _save_starter_content_changeset() {
1702
1703		if ( empty( $this->pending_starter_content_settings_ids ) ) {
1704			return;
1705		}
1706
1707		$this->save_changeset_post(
1708			array(
1709				'data'            => array_fill_keys( $this->pending_starter_content_settings_ids, array( 'starter_content' => true ) ),
1710				'starter_content' => true,
1711			)
1712		);
1713		$this->saved_starter_content_changeset = true;
1714
1715		$this->pending_starter_content_settings_ids = array();
1716	}
1717
1718	/**
1719	 * Get dirty pre-sanitized setting values in the current customized state.
1720	 *
1721	 * The returned array consists of a merge of three sources:
1722	 * 1. If the theme is not currently active, then the base array is any stashed
1723	 *    theme mods that were modified previously but never published.
1724	 * 2. The values from the current changeset, if it exists.
1725	 * 3. If the user can customize, the values parsed from the incoming
1726	 *    `$_POST['customized']` JSON data.
1727	 * 4. Any programmatically-set post values via `WP_Customize_Manager::set_post_value()`.
1728	 *
1729	 * The name "unsanitized_post_values" is a carry-over from when the customized
1730	 * state was exclusively sourced from `$_POST['customized']`. Nevertheless,
1731	 * the value returned will come from the current changeset post and from the
1732	 * incoming post data.
1733	 *
1734	 * @since 4.1.1
1735	 * @since 4.7.0 Added `$args` parameter and merging with changeset values and stashed theme mods.
1736	 *
1737	 * @param array $args {
1738	 *     Args.
1739	 *
1740	 *     @type bool $exclude_changeset Whether the changeset values should also be excluded. Defaults to false.
1741	 *     @type bool $exclude_post_data Whether the post input values should also be excluded. Defaults to false when lacking the customize capability.
1742	 * }
1743	 * @return array
1744	 */
1745	public function unsanitized_post_values( $args = array() ) {
1746		$args = array_merge(
1747			array(
1748				'exclude_changeset' => false,
1749				'exclude_post_data' => ! current_user_can( 'customize' ),
1750			),
1751			$args
1752		);
1753
1754		$values = array();
1755
1756		// Let default values be from the stashed theme mods if doing a theme switch and if no changeset is present.
1757		if ( ! $this->is_theme_active() ) {
1758			$stashed_theme_mods = get_option( 'customize_stashed_theme_mods' );
1759			$stylesheet         = $this->get_stylesheet();
1760			if ( isset( $stashed_theme_mods[ $stylesheet ] ) ) {
1761				$values = array_merge( $values, wp_list_pluck( $stashed_theme_mods[ $stylesheet ], 'value' ) );
1762			}
1763		}
1764
1765		if ( ! $args['exclude_changeset'] ) {
1766			foreach ( $this->changeset_data() as $setting_id => $setting_params ) {
1767				if ( ! array_key_exists( 'value', $setting_params ) ) {
1768					continue;
1769				}
1770				if ( isset( $setting_params['type'] ) && 'theme_mod' === $setting_params['type'] ) {
1771
1772					// Ensure that theme mods values are only used if they were saved under the current theme.
1773					$namespace_pattern = '/^(?P<stylesheet>.+?)::(?P<setting_id>.+)$/';
1774					if ( preg_match( $namespace_pattern, $setting_id, $matches ) && $this->get_stylesheet() === $matches['stylesheet'] ) {
1775						$values[ $matches['setting_id'] ] = $setting_params['value'];
1776					}
1777				} else {
1778					$values[ $setting_id ] = $setting_params['value'];
1779				}
1780			}
1781		}
1782
1783		if ( ! $args['exclude_post_data'] ) {
1784			if ( ! isset( $this->_post_values ) ) {
1785				if ( isset( $_POST['customized'] ) ) {
1786					$post_values = json_decode( wp_unslash( $_POST['customized'] ), true );
1787				} else {
1788					$post_values = array();
1789				}
1790				if ( is_array( $post_values ) ) {
1791					$this->_post_values = $post_values;
1792				} else {
1793					$this->_post_values = array();
1794				}
1795			}
1796			$values = array_merge( $values, $this->_post_values );
1797		}
1798		return $values;
1799	}
1800
1801	/**
1802	 * Returns the sanitized value for a given setting from the current customized state.
1803	 *
1804	 * The name "post_value" is a carry-over from when the customized state was exclusively
1805	 * sourced from `$_POST['customized']`. Nevertheless, the value returned will come
1806	 * from the current changeset post and from the incoming post data.
1807	 *
1808	 * @since 3.4.0
1809	 * @since 4.1.1 Introduced the `$default` parameter.
1810	 * @since 4.6.0 `$default` is now returned early when the setting post value is invalid.
1811	 *
1812	 * @see WP_REST_Server::dispatch()
1813	 * @see WP_REST_Request::sanitize_params()
1814	 * @see WP_REST_Request::has_valid_params()
1815	 *
1816	 * @param WP_Customize_Setting $setting A WP_Customize_Setting derived object.
1817	 * @param mixed                $default Value returned $setting has no post value (added in 4.2.0)
1818	 *                                      or the post value is invalid (added in 4.6.0).
1819	 * @return string|mixed Sanitized value or the $default provided.
1820	 */
1821	public function post_value( $setting, $default = null ) {
1822		$post_values = $this->unsanitized_post_values();
1823		if ( ! array_key_exists( $setting->id, $post_values ) ) {
1824			return $default;
1825		}
1826		$value = $post_values[ $setting->id ];
1827		$valid = $setting->validate( $value );
1828		if ( is_wp_error( $valid ) ) {
1829			return $default;
1830		}
1831		$value = $setting->sanitize( $value );
1832		if ( is_null( $value ) || is_wp_error( $value ) ) {
1833			return $default;
1834		}
1835		return $value;
1836	}
1837
1838	/**
1839	 * Override a setting's value in the current customized state.
1840	 *
1841	 * The name "post_value" is a carry-over from when the customized state was
1842	 * exclusively sourced from `$_POST['customized']`.
1843	 *
1844	 * @since 4.2.0
1845	 *
1846	 * @param string $setting_id ID for the WP_Customize_Setting instance.
1847	 * @param mixed  $value      Post value.
1848	 */
1849	public function set_post_value( $setting_id, $value ) {
1850		$this->unsanitized_post_values(); // Populate _post_values from $_POST['customized'].
1851		$this->_post_values[ $setting_id ] = $value;
1852
1853		/**
1854		 * Announce when a specific setting's unsanitized post value has been set.
1855		 *
1856		 * Fires when the WP_Customize_Manager::set_post_value() method is called.
1857		 *
1858		 * The dynamic portion of the hook name, `$setting_id`, refers to the setting ID.
1859		 *
1860		 * @since 4.4.0
1861		 *
1862		 * @param mixed                $value Unsanitized setting post value.
1863		 * @param WP_Customize_Manager $this  WP_Customize_Manager instance.
1864		 */
1865		do_action( "customize_post_value_set_{$setting_id}", $value, $this );
1866
1867		/**
1868		 * Announce when any setting's unsanitized post value has been set.
1869		 *
1870		 * Fires when the WP_Customize_Manager::set_post_value() method is called.
1871		 *
1872		 * This is useful for `WP_Customize_Setting` instances to watch
1873		 * in order to update a cached previewed value.
1874		 *
1875		 * @since 4.4.0
1876		 *
1877		 * @param string               $setting_id Setting ID.
1878		 * @param mixed                $value      Unsanitized setting post value.
1879		 * @param WP_Customize_Manager $this       WP_Customize_Manager instance.
1880		 */
1881		do_action( 'customize_post_value_set', $setting_id, $value, $this );
1882	}
1883
1884	/**
1885	 * Print JavaScript settings.
1886	 *
1887	 * @since 3.4.0
1888	 */
1889	public function customize_preview_init() {
1890
1891		/*
1892		 * Now that Customizer previews are loaded into iframes via GET requests
1893		 * and natural URLs with transaction UUIDs added, we need to ensure that
1894		 * the responses are never cached by proxies. In practice, this will not
1895		 * be needed if the user is logged-in anyway. But if anonymous access is
1896		 * allowed then the auth cookies would not be sent and WordPress would
1897		 * not send no-cache headers by default.
1898		 */
1899		if ( ! headers_sent() ) {
1900			nocache_headers();
1901			header( 'X-Robots: noindex, nofollow, noarchive' );
1902		}
1903		add_filter( 'wp_robots', 'wp_robots_no_robots' );
1904		add_filter( 'wp_headers', array( $this, 'filter_iframe_security_headers' ) );
1905
1906		/*
1907		 * If preview is being served inside the customizer preview iframe, and
1908		 * if the user doesn't have customize capability, then it is assumed
1909		 * that the user's session has expired and they need to re-authenticate.
1910		 */
1911		if ( $this->messenger_channel && ! current_user_can( 'customize' ) ) {
1912			$this->wp_die(
1913				-1,
1914				sprintf(
1915					/* translators: %s: customize_messenger_channel */
1916					__( 'Unauthorized. You may remove the %s param to preview as frontend.' ),
1917					'<code>customize_messenger_channel<code>'
1918				)
1919			);
1920			return;
1921		}
1922
1923		$this->prepare_controls();
1924
1925		add_filter( 'wp_redirect', array( $this, 'add_state_query_params' ) );
1926
1927		wp_enqueue_script( 'customize-preview' );
1928		wp_enqueue_style( 'customize-preview' );
1929		add_action( 'wp_head', array( $this, 'customize_preview_loading_style' ) );
1930		add_action( 'wp_head', array( $this, 'remove_frameless_preview_messenger_channel' ) );
1931		add_action( 'wp_footer', array( $this, 'customize_preview_settings' ), 20 );
1932		add_filter( 'get_edit_post_link', '__return_empty_string' );
1933
1934		/**
1935		 * Fires once the Customizer preview has initialized and JavaScript
1936		 * settings have been printed.
1937		 *
1938		 * @since 3.4.0
1939		 *
1940		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
1941		 */
1942		do_action( 'customize_preview_init', $this );
1943	}
1944
1945	/**
1946	 * Filters the X-Frame-Options and Content-Security-Policy headers to ensure frontend can load in customizer.
1947	 *
1948	 * @since 4.7.0
1949	 *
1950	 * @param array $headers Headers.
1951	 * @return array Headers.
1952	 */
1953	public function filter_iframe_security_headers( $headers ) {
1954		$headers['X-Frame-Options']         = 'SAMEORIGIN';
1955		$headers['Content-Security-Policy'] = "frame-ancestors 'self'";
1956		return $headers;
1957	}
1958
1959	/**
1960	 * Add customize state query params to a given URL if preview is allowed.
1961	 *
1962	 * @since 4.7.0
1963	 *
1964	 * @see wp_redirect()
1965	 * @see WP_Customize_Manager::get_allowed_url()
1966	 *
1967	 * @param string $url URL.
1968	 * @return string URL.
1969	 */
1970	public function add_state_query_params( $url ) {
1971		$parsed_original_url = wp_parse_url( $url );
1972		$is_allowed          = false;
1973		foreach ( $this->get_allowed_urls() as $allowed_url ) {
1974			$parsed_allowed_url = wp_parse_url( $allowed_url );
1975			$is_allowed         = (
1976				$parsed_allowed_url['scheme'] === $parsed_original_url['scheme']
1977				&&
1978				$parsed_allowed_url['host'] === $parsed_original_url['host']
1979				&&
1980				0 === strpos( $parsed_original_url['path'], $parsed_allowed_url['path'] )
1981			);
1982			if ( $is_allowed ) {
1983				break;
1984			}
1985		}
1986
1987		if ( $is_allowed ) {
1988			$query_params = array(
1989				'customize_changeset_uuid' => $this->changeset_uuid(),
1990			);
1991			if ( ! $this->is_theme_active() ) {
1992				$query_params['customize_theme'] = $this->get_stylesheet();
1993			}
1994			if ( $this->messenger_channel ) {
1995				$query_params['customize_messenger_channel'] = $this->messenger_channel;
1996			}
1997			$url = add_query_arg( $query_params, $url );
1998		}
1999
2000		return $url;
2001	}
2002
2003	/**
2004	 * Prevent sending a 404 status when returning the response for the customize
2005	 * preview, since it causes the jQuery Ajax to fail. Send 200 instead.
2006	 *
2007	 * @since 4.0.0
2008	 * @deprecated 4.7.0
2009	 */
2010	public function customize_preview_override_404_status() {
2011		_deprecated_function( __METHOD__, '4.7.0' );
2012	}
2013
2014	/**
2015	 * Print base element for preview frame.
2016	 *
2017	 * @since 3.4.0
2018	 * @deprecated 4.7.0
2019	 */
2020	public function customize_preview_base() {
2021		_deprecated_function( __METHOD__, '4.7.0' );
2022	}
2023
2024	/**
2025	 * Print a workaround to handle HTML5 tags in IE < 9.
2026	 *
2027	 * @since 3.4.0
2028	 * @deprecated 4.7.0 Customizer no longer supports IE8, so all supported browsers recognize HTML5.
2029	 */
2030	public function customize_preview_html5() {
2031		_deprecated_function( __FUNCTION__, '4.7.0' );
2032	}
2033
2034	/**
2035	 * Print CSS for loading indicators for the Customizer preview.
2036	 *
2037	 * @since 4.2.0
2038	 */
2039	public function customize_preview_loading_style() {
2040		?>
2041		<style>
2042			body.wp-customizer-unloading {
2043				opacity: 0.25;
2044				cursor: progress !important;
2045				-webkit-transition: opacity 0.5s;
2046				transition: opacity 0.5s;
2047			}
2048			body.wp-customizer-unloading * {
2049				pointer-events: none !important;
2050			}
2051			form.customize-unpreviewable,
2052			form.customize-unpreviewable input,
2053			form.customize-unpreviewable select,
2054			form.customize-unpreviewable button,
2055			a.customize-unpreviewable,
2056			area.customize-unpreviewable {
2057				cursor: not-allowed !important;
2058			}
2059		</style>
2060		<?php
2061	}
2062
2063	/**
2064	 * Remove customize_messenger_channel query parameter from the preview window when it is not in an iframe.
2065	 *
2066	 * This ensures that the admin bar will be shown. It also ensures that link navigation will
2067	 * work as expected since the parent frame is not being sent the URL to navigate to.
2068	 *
2069	 * @since 4.7.0
2070	 */
2071	public function remove_frameless_preview_messenger_channel() {
2072		if ( ! $this->messenger_channel ) {
2073			return;
2074		}
2075		?>
2076		<script>
2077		( function() {
2078			var urlParser, oldQueryParams, newQueryParams, i;
2079			if ( parent !== window ) {
2080				return;
2081			}
2082			urlParser = document.createElement( 'a' );
2083			urlParser.href = location.href;
2084			oldQueryParams = urlParser.search.substr( 1 ).split( /&/ );
2085			newQueryParams = [];
2086			for ( i = 0; i < oldQueryParams.length; i += 1 ) {
2087				if ( ! /^customize_messenger_channel=/.test( oldQueryParams[ i ] ) ) {
2088					newQueryParams.push( oldQueryParams[ i ] );
2089				}
2090			}
2091			urlParser.search = newQueryParams.join( '&' );
2092			if ( urlParser.search !== location.search ) {
2093				location.replace( urlParser.href );
2094			}
2095		} )();
2096		</script>
2097		<?php
2098	}
2099
2100	/**
2101	 * Print JavaScript settings for preview frame.
2102	 *
2103	 * @since 3.4.0
2104	 */
2105	public function customize_preview_settings() {
2106		$post_values                 = $this->unsanitized_post_values( array( 'exclude_changeset' => true ) );
2107		$setting_validities          = $this->validate_setting_values( $post_values );
2108		$exported_setting_validities = array_map( array( $this, 'prepare_setting_validity_for_js' ), $setting_validities );
2109
2110		// Note that the REQUEST_URI is not passed into home_url() since this breaks subdirectory installations.
2111		$self_url           = empty( $_SERVER['REQUEST_URI'] ) ? home_url( '/' ) : esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) );
2112		$state_query_params = array(
2113			'customize_theme',
2114			'customize_changeset_uuid',
2115			'customize_messenger_channel',
2116		);
2117		$self_url           = remove_query_arg( $state_query_params, $self_url );
2118
2119		$allowed_urls  = $this->get_allowed_urls();
2120		$allowed_hosts = array();
2121		foreach ( $allowed_urls as $allowed_url ) {
2122			$parsed = wp_parse_url( $allowed_url );
2123			if ( empty( $parsed['host'] ) ) {
2124				continue;
2125			}
2126			$host = $parsed['host'];
2127			if ( ! empty( $parsed['port'] ) ) {
2128				$host .= ':' . $parsed['port'];
2129			}
2130			$allowed_hosts[] = $host;
2131		}
2132
2133		$switched_locale = switch_to_locale( get_user_locale() );
2134		$l10n            = array(
2135			'shiftClickToEdit'  => __( 'Shift-click to edit this element.' ),
2136			'linkUnpreviewable' => __( 'This link is not live-previewable.' ),
2137			'formUnpreviewable' => __( 'This form is not live-previewable.' ),
2138		);
2139		if ( $switched_locale ) {
2140			restore_previous_locale();
2141		}
2142
2143		$settings = array(
2144			'changeset'         => array(
2145				'uuid'      => $this->changeset_uuid(),
2146				'autosaved' => $this->autosaved(),
2147			),
2148			'timeouts'          => array(
2149				'selectiveRefresh' => 250,
2150				'keepAliveSend'    => 1000,
2151			),
2152			'theme'             => array(
2153				'stylesheet' => $this->get_stylesheet(),
2154				'active'     => $this->is_theme_active(),
2155			),
2156			'url'               => array(
2157				'self'          => $self_url,
2158				'allowed'       => array_map( 'esc_url_raw', $this->get_allowed_urls() ),
2159				'allowedHosts'  => array_unique( $allowed_hosts ),
2160				'isCrossDomain' => $this->is_cross_domain(),
2161			),
2162			'channel'           => $this->messenger_channel,
2163			'activePanels'      => array(),
2164			'activeSections'    => array(),
2165			'activeControls'    => array(),
2166			'settingValidities' => $exported_setting_validities,
2167			'nonce'             => current_user_can( 'customize' ) ? $this->get_nonces() : array(),
2168			'l10n'              => $l10n,
2169			'_dirty'            => array_keys( $post_values ),
2170		);
2171
2172		foreach ( $this->panels as $panel_id => $panel ) {
2173			if ( $panel->check_capabilities() ) {
2174				$settings['activePanels'][ $panel_id ] = $panel->active();
2175				foreach ( $panel->sections as $section_id => $section ) {
2176					if ( $section->check_capabilities() ) {
2177						$settings['activeSections'][ $section_id ] = $section->active();
2178					}
2179				}
2180			}
2181		}
2182		foreach ( $this->sections as $id => $section ) {
2183			if ( $section->check_capabilities() ) {
2184				$settings['activeSections'][ $id ] = $section->active();
2185			}
2186		}
2187		foreach ( $this->controls as $id => $control ) {
2188			if ( $control->check_capabilities() ) {
2189				$settings['activeControls'][ $id ] = $control->active();
2190			}
2191		}
2192
2193		?>
2194		<script type="text/javascript">
2195			var _wpCustomizeSettings = <?php echo wp_json_encode( $settings ); ?>;
2196			_wpCustomizeSettings.values = {};
2197			(function( v ) {
2198				<?php
2199				/*
2200				 * Serialize settings separately from the initial _wpCustomizeSettings
2201				 * serialization in order to avoid a peak memory usage spike.
2202				 * @todo We may not even need to export the values at all since the pane syncs them anyway.
2203				 */
2204				foreach ( $this->settings as $id => $setting ) {
2205					if ( $setting->check_capabilities() ) {
2206						printf(
2207							"v[%s] = %s;\n",
2208							wp_json_encode( $id ),
2209							wp_json_encode( $setting->js_value() )
2210						);
2211					}
2212				}
2213				?>
2214			})( _wpCustomizeSettings.values );
2215		</script>
2216		<?php
2217	}
2218
2219	/**
2220	 * Prints a signature so we can ensure the Customizer was properly executed.
2221	 *
2222	 * @since 3.4.0
2223	 * @deprecated 4.7.0
2224	 */
2225	public function customize_preview_signature() {
2226		_deprecated_function( __METHOD__, '4.7.0' );
2227	}
2228
2229	/**
2230	 * Removes the signature in case we experience a case where the Customizer was not properly executed.
2231	 *
2232	 * @since 3.4.0
2233	 * @deprecated 4.7.0
2234	 *
2235	 * @param mixed $return Value passed through for {@see 'wp_die_handler'} filter.
2236	 * @return mixed Value passed through for {@see 'wp_die_handler'} filter.
2237	 */
2238	public function remove_preview_signature( $return = null ) {
2239		_deprecated_function( __METHOD__, '4.7.0' );
2240
2241		return $return;
2242	}
2243
2244	/**
2245	 * Is it a theme preview?
2246	 *
2247	 * @since 3.4.0
2248	 *
2249	 * @return bool True if it's a preview, false if not.
2250	 */
2251	public function is_preview() {
2252		return (bool) $this->previewing;
2253	}
2254
2255	/**
2256	 * Retrieve the template name of the previewed theme.
2257	 *
2258	 * @since 3.4.0
2259	 *
2260	 * @return string Template name.
2261	 */
2262	public function get_template() {
2263		return $this->theme()->get_template();
2264	}
2265
2266	/**
2267	 * Retrieve the stylesheet name of the previewed theme.
2268	 *
2269	 * @since 3.4.0
2270	 *
2271	 * @return string Stylesheet name.
2272	 */
2273	public function get_stylesheet() {
2274		return $this->theme()->get_stylesheet();
2275	}
2276
2277	/**
2278	 * Retrieve the template root of the previewed theme.
2279	 *
2280	 * @since 3.4.0
2281	 *
2282	 * @return string Theme root.
2283	 */
2284	public function get_template_root() {
2285		return get_raw_theme_root( $this->get_template(), true );
2286	}
2287
2288	/**
2289	 * Retrieve the stylesheet root of the previewed theme.
2290	 *
2291	 * @since 3.4.0
2292	 *
2293	 * @return string Theme root.
2294	 */
2295	public function get_stylesheet_root() {
2296		return get_raw_theme_root( $this->get_stylesheet(), true );
2297	}
2298
2299	/**
2300	 * Filters the current theme and return the name of the previewed theme.
2301	 *
2302	 * @since 3.4.0
2303	 *
2304	 * @param mixed $current_theme {@internal Parameter is not used}
2305	 * @return string Theme name.
2306	 */
2307	public function current_theme( $current_theme ) {
2308		return $this->theme()->display( 'Name' );
2309	}
2310
2311	/**
2312	 * Validates setting values.
2313	 *
2314	 * Validation is skipped for unregistered settings or for values that are
2315	 * already null since they will be skipped anyway. Sanitization is applied
2316	 * to values that pass validation, and values that become null or `WP_Error`
2317	 * after sanitizing are marked invalid.
2318	 *
2319	 * @since 4.6.0
2320	 *
2321	 * @see WP_REST_Request::has_valid_params()
2322	 * @see WP_Customize_Setting::validate()
2323	 *
2324	 * @param array $setting_values Mapping of setting IDs to values to validate and sanitize.
2325	 * @param array $options {
2326	 *     Options.
2327	 *
2328	 *     @type bool $validate_existence  Whether a setting's existence will be checked.
2329	 *     @type bool $validate_capability Whether the setting capability will be checked.
2330	 * }
2331	 * @return array Mapping of setting IDs to return value of validate method calls, either `true` or `WP_Error`.
2332	 */
2333	public function validate_setting_values( $setting_values, $options = array() ) {
2334		$options = wp_parse_args(
2335			$options,
2336			array(
2337				'validate_capability' => false,
2338				'validate_existence'  => false,
2339			)
2340		);
2341
2342		$validities = array();
2343		foreach ( $setting_values as $setting_id => $unsanitized_value ) {
2344			$setting = $this->get_setting( $setting_id );
2345			if ( ! $setting ) {
2346				if ( $options['validate_existence'] ) {
2347					$validities[ $setting_id ] = new WP_Error( 'unrecognized', __( 'Setting does not exist or is unrecognized.' ) );
2348				}
2349				continue;
2350			}
2351			if ( $options['validate_capability'] && ! current_user_can( $setting->capability ) ) {
2352				$validity = new WP_Error( 'unauthorized', __( 'Unauthorized to modify setting due to capability.' ) );
2353			} else {
2354				if ( is_null( $unsanitized_value ) ) {
2355					continue;
2356				}
2357				$validity = $setting->validate( $unsanitized_value );
2358			}
2359			if ( ! is_wp_error( $validity ) ) {
2360				/** This filter is documented in wp-includes/class-wp-customize-setting.php */
2361				$late_validity = apply_filters( "customize_validate_{$setting->id}", new WP_Error(), $unsanitized_value, $setting );
2362				if ( is_wp_error( $late_validity ) && $late_validity->has_errors() ) {
2363					$validity = $late_validity;
2364				}
2365			}
2366			if ( ! is_wp_error( $validity ) ) {
2367				$value = $setting->sanitize( $unsanitized_value );
2368				if ( is_null( $value ) ) {
2369					$validity = false;
2370				} elseif ( is_wp_error( $value ) ) {
2371					$validity = $value;
2372				}
2373			}
2374			if ( false === $validity ) {
2375				$validity = new WP_Error( 'invalid_value', __( 'Invalid value.' ) );
2376			}
2377			$validities[ $setting_id ] = $validity;
2378		}
2379		return $validities;
2380	}
2381
2382	/**
2383	 * Prepares setting validity for exporting to the client (JS).
2384	 *
2385	 * Converts `WP_Error` instance into array suitable for passing into the
2386	 * `wp.customize.Notification` JS model.
2387	 *
2388	 * @since 4.6.0
2389	 *
2390	 * @param true|WP_Error $validity Setting validity.
2391	 * @return true|array If `$validity` was a WP_Error, the error codes will be array-mapped
2392	 *                    to their respective `message` and `data` to pass into the
2393	 *                    `wp.customize.Notification` JS model.
2394	 */
2395	public function prepare_setting_validity_for_js( $validity ) {
2396		if ( is_wp_error( $validity ) ) {
2397			$notification = array();
2398			foreach ( $validity->errors as $error_code => $error_messages ) {
2399				$notification[ $error_code ] = array(
2400					'message' => implode( ' ', $error_messages ),
2401					'data'    => $validity->get_error_data( $error_code ),
2402				);
2403			}
2404			return $notification;
2405		} else {
2406			return true;
2407		}
2408	}
2409
2410	/**
2411	 * Handle customize_save WP Ajax request to save/update a changeset.
2412	 *
2413	 * @since 3.4.0
2414	 * @since 4.7.0 The semantics of this method have changed to update a changeset, optionally to also change the status and other attributes.
2415	 */
2416	public function save() {
2417		if ( ! is_user_logged_in() ) {
2418			wp_send_json_error( 'unauthenticated' );
2419		}
2420
2421		if ( ! $this->is_preview() ) {
2422			wp_send_json_error( 'not_preview' );
2423		}
2424
2425		$action = 'save-customize_' . $this->get_stylesheet();
2426		if ( ! check_ajax_referer( $action, 'nonce', false ) ) {
2427			wp_send_json_error( 'invalid_nonce' );
2428		}
2429
2430		$changeset_post_id = $this->changeset_post_id();
2431		$is_new_changeset  = empty( $changeset_post_id );
2432		if ( $is_new_changeset ) {
2433			if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->create_posts ) ) {
2434				wp_send_json_error( 'cannot_create_changeset_post' );
2435			}
2436		} else {
2437			if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->edit_post, $changeset_post_id ) ) {
2438				wp_send_json_error( 'cannot_edit_changeset_post' );
2439			}
2440		}
2441
2442		if ( ! empty( $_POST['customize_changeset_data'] ) ) {
2443			$input_changeset_data = json_decode( wp_unslash( $_POST['customize_changeset_data'] ), true );
2444			if ( ! is_array( $input_changeset_data ) ) {
2445				wp_send_json_error( 'invalid_customize_changeset_data' );
2446			}
2447		} else {
2448			$input_changeset_data = array();
2449		}
2450
2451		// Validate title.
2452		$changeset_title = null;
2453		if ( isset( $_POST['customize_changeset_title'] ) ) {
2454			$changeset_title = sanitize_text_field( wp_unslash( $_POST['customize_changeset_title'] ) );
2455		}
2456
2457		// Validate changeset status param.
2458		$is_publish       = null;
2459		$changeset_status = null;
2460		if ( isset( $_POST['customize_changeset_status'] ) ) {
2461			$changeset_status = wp_unslash( $_POST['customize_changeset_status'] );
2462			if ( ! get_post_status_object( $changeset_status ) || ! in_array( $changeset_status, array( 'draft', 'pending', 'publish', 'future' ), true ) ) {
2463				wp_send_json_error( 'bad_customize_changeset_status', 400 );
2464			}
2465			$is_publish = ( 'publish' === $changeset_status || 'future' === $changeset_status );
2466			if ( $is_publish && ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->publish_posts ) ) {
2467				wp_send_json_error( 'changeset_publish_unauthorized', 403 );
2468			}
2469		}
2470
2471		/*
2472		 * Validate changeset date param. Date is assumed to be in local time for
2473		 * the WP if in MySQL format (YYYY-MM-DD HH:MM:SS). Otherwise, the date
2474		 * is parsed with strtotime() so that ISO date format may be supplied
2475		 * or a string like "+10 minutes".
2476		 */
2477		$changeset_date_gmt = null;
2478		if ( isset( $_POST['customize_changeset_date'] ) ) {
2479			$changeset_date = wp_unslash( $_POST['customize_changeset_date'] );
2480			if ( preg_match( '/^\d\d\d\d-\d\d-\d\d \d\d:\d\d:\d\d$/', $changeset_date ) ) {
2481				$mm         = substr( $changeset_date, 5, 2 );
2482				$jj         = substr( $changeset_date, 8, 2 );
2483				$aa         = substr( $changeset_date, 0, 4 );
2484				$valid_date = wp_checkdate( $mm, $jj, $aa, $changeset_date );
2485				if ( ! $valid_date ) {
2486					wp_send_json_error( 'bad_customize_changeset_date', 400 );
2487				}
2488				$changeset_date_gmt = get_gmt_from_date( $changeset_date );
2489			} else {
2490				$timestamp = strtotime( $changeset_date );
2491				if ( ! $timestamp ) {
2492					wp_send_json_error( 'bad_customize_changeset_date', 400 );
2493				}
2494				$changeset_date_gmt = gmdate( 'Y-m-d H:i:s', $timestamp );
2495			}
2496		}
2497
2498		$lock_user_id = null;
2499		$autosave     = ! empty( $_POST['customize_changeset_autosave'] );
2500		if ( ! $is_new_changeset ) {
2501			$lock_user_id = wp_check_post_lock( $this->changeset_post_id() );
2502		}
2503
2504		// Force request to autosave when changeset is locked.
2505		if ( $lock_user_id && ! $autosave ) {
2506			$autosave           = true;
2507			$changeset_status   = null;
2508			$changeset_date_gmt = null;
2509		}
2510
2511		if ( $autosave && ! defined( 'DOING_AUTOSAVE' ) ) { // Back-compat.
2512			define( 'DOING_AUTOSAVE', true );
2513		}
2514
2515		$autosaved = false;
2516		$r         = $this->save_changeset_post(
2517			array(
2518				'status'   => $changeset_status,
2519				'title'    => $changeset_title,
2520				'date_gmt' => $changeset_date_gmt,
2521				'data'     => $input_changeset_data,
2522				'autosave' => $autosave,
2523			)
2524		);
2525		if ( $autosave && ! is_wp_error( $r ) ) {
2526			$autosaved = true;
2527		}
2528
2529		// If the changeset was locked and an autosave request wasn't itself an error, then now explicitly return with a failure.
2530		if ( $lock_user_id && ! is_wp_error( $r ) ) {
2531			$r = new WP_Error(
2532				'changeset_locked',
2533				__( 'Changeset is being edited by other user.' ),
2534				array(
2535					'lock_user' => $this->get_lock_user_data( $lock_user_id ),
2536				)
2537			);
2538		}
2539
2540		if ( is_wp_error( $r ) ) {
2541			$response = array(
2542				'message' => $r->get_error_message(),
2543				'code'    => $r->get_error_code(),
2544			);
2545			if ( is_array( $r->get_error_data() ) ) {
2546				$response = array_merge( $response, $r->get_error_data() );
2547			} else {
2548				$response['data'] = $r->get_error_data();
2549			}
2550		} else {
2551			$response       = $r;
2552			$changeset_post = get_post( $this->changeset_post_id() );
2553
2554			// Dismiss all other auto-draft changeset posts for this user (they serve like autosave revisions), as there should only be one.
2555			if ( $is_new_changeset ) {
2556				$this->dismiss_user_auto_draft_changesets();
2557			}
2558
2559			// Note that if the changeset status was publish, then it will get set to Trash if revisions are not supported.
2560			$response['changeset_status'] = $changeset_post->post_status;
2561			if ( $is_publish && 'trash' === $response['changeset_status'] ) {
2562				$response['changeset_status'] = 'publish';
2563			}
2564
2565			if ( 'publish' !== $response['changeset_status'] ) {
2566				$this->set_changeset_lock( $changeset_post->ID );
2567			}
2568
2569			if ( 'future' === $response['changeset_status'] ) {
2570				$response['changeset_date'] = $changeset_post->post_date;
2571			}
2572
2573			if ( 'publish' === $response['changeset_status'] || 'trash' === $response['changeset_status'] ) {
2574				$response['next_changeset_uuid'] = wp_generate_uuid4();
2575			}
2576		}
2577
2578		if ( $autosave ) {
2579			$response['autosaved'] = $autosaved;
2580		}
2581
2582		if ( isset( $response['setting_validities'] ) ) {
2583			$response['setting_validities'] = array_map( array( $this, 'prepare_setting_validity_for_js' ), $response['setting_validities'] );
2584		}
2585
2586		/**
2587		 * Filters response data for a successful customize_save Ajax request.
2588		 *
2589		 * This filter does not apply if there was a nonce or authentication failure.
2590		 *
2591		 * @since 4.2.0
2592		 *
2593		 * @param array                $response Additional information passed back to the 'saved'
2594		 *                                       event on `wp.customize`.
2595		 * @param WP_Customize_Manager $this     WP_Customize_Manager instance.
2596		 */
2597		$response = apply_filters( 'customize_save_response', $response, $this );
2598
2599		if ( is_wp_error( $r ) ) {
2600			wp_send_json_error( $response );
2601		} else {
2602			wp_send_json_success( $response );
2603		}
2604	}
2605
2606	/**
2607	 * Save the post for the loaded changeset.
2608	 *
2609	 * @since 4.7.0
2610	 *
2611	 * @param array $args {
2612	 *     Args for changeset post.
2613	 *
2614	 *     @type array  $data            Optional additional changeset data. Values will be merged on top of any existing post values.
2615	 *     @type string $status          Post status. Optional. If supplied, the save will be transactional and a post revision will be allowed.
2616	 *     @type string $title           Post title. Optional.
2617	 *     @type string $date_gmt        Date in GMT. Optional.
2618	 *     @type int    $user_id         ID for user who is saving the changeset. Optional, defaults to the current user ID.
2619	 *     @type bool   $starter_content Whether the data is starter content. If false (default), then $starter_content will be cleared for any $data being saved.
2620	 *     @type bool   $autosave        Whether this is a request to create an autosave revision.
2621	 * }
2622	 *
2623	 * @return array|WP_Error Returns array on success and WP_Error with array data on error.
2624	 */
2625	function save_changeset_post( $args = array() ) {
2626
2627		$args = array_merge(
2628			array(
2629				'status'          => null,
2630				'title'           => null,
2631				'data'            => array(),
2632				'date_gmt'        => null,
2633				'user_id'         => get_current_user_id(),
2634				'starter_content' => false,
2635				'autosave'        => false,
2636			),
2637			$args
2638		);
2639
2640		$changeset_post_id       = $this->changeset_post_id();
2641		$existing_changeset_data = array();
2642		if ( $changeset_post_id ) {
2643			$existing_status = get_post_status( $changeset_post_id );
2644			if ( 'publish' === $existing_status || 'trash' === $existing_status ) {
2645				return new WP_Error(
2646					'changeset_already_published',
2647					__( 'The previous set of changes has already been published. Please try saving your current set of changes again.' ),
2648					array(
2649						'next_changeset_uuid' => wp_generate_uuid4(),
2650					)
2651				);
2652			}
2653
2654			$existing_changeset_data = $this->get_changeset_post_data( $changeset_post_id );
2655			if ( is_wp_error( $existing_changeset_data ) ) {
2656				return $existing_changeset_data;
2657			}
2658		}
2659
2660		// Fail if attempting to publish but publish hook is missing.
2661		if ( 'publish' === $args['status'] && false === has_action( 'transition_post_status', '_wp_customize_publish_changeset' ) ) {
2662			return new WP_Error( 'missing_publish_callback' );
2663		}
2664
2665		// Validate date.
2666		$now = gmdate( 'Y-m-d H:i:59' );
2667		if ( $args['date_gmt'] ) {
2668			$is_future_dated = ( mysql2date( 'U', $args['date_gmt'], false ) > mysql2date( 'U', $now, false ) );
2669			if ( ! $is_future_dated ) {
2670				return new WP_Error( 'not_future_date', __( 'You must supply a future date to schedule.' ) ); // Only future dates are allowed.
2671			}
2672
2673			if ( ! $this->is_theme_active() && ( 'future' === $args['status'] || $is_future_dated ) ) {
2674				return new WP_Error( 'cannot_schedule_theme_switches' ); // This should be allowed in the future, when theme is a regular setting.
2675			}
2676			$will_remain_auto_draft = ( ! $args['status'] && ( ! $changeset_post_id || 'auto-draft' === get_post_status( $changeset_post_id ) ) );
2677			if ( $will_remain_auto_draft ) {
2678				return new WP_Error( 'cannot_supply_date_for_auto_draft_changeset' );
2679			}
2680		} elseif ( $changeset_post_id && 'future' === $args['status'] ) {
2681
2682			// Fail if the new status is future but the existing post's date is not in the future.
2683			$changeset_post = get_post( $changeset_post_id );
2684			if ( mysql2date( 'U', $changeset_post->post_date_gmt, false ) <= mysql2date( 'U', $now, false ) ) {
2685				return new WP_Error( 'not_future_date', __( 'You must supply a future date to schedule.' ) );
2686			}
2687		}
2688
2689		if ( ! empty( $is_future_dated ) && 'publish' === $args['status'] ) {
2690			$args['status'] = 'future';
2691		}
2692
2693		// Validate autosave param. See _wp_post_revision_fields() for why these fields are disallowed.
2694		if ( $args['autosave'] ) {
2695			if ( $args['date_gmt'] ) {
2696				return new WP_Error( 'illegal_autosave_with_date_gmt' );
2697			} elseif ( $args['status'] ) {
2698				return new WP_Error( 'illegal_autosave_with_status' );
2699			} elseif ( $args['user_id'] && get_current_user_id() !== $args['user_id'] ) {
2700				return new WP_Error( 'illegal_autosave_with_non_current_user' );
2701			}
2702		}
2703
2704		// The request was made via wp.customize.previewer.save().
2705		$update_transactionally = (bool) $args['status'];
2706		$allow_revision         = (bool) $args['status'];
2707
2708		// Amend post values with any supplied data.
2709		foreach ( $args['data'] as $setting_id => $setting_params ) {
2710			if ( is_array( $setting_params ) && array_key_exists( 'value', $setting_params ) ) {
2711				$this->set_post_value( $setting_id, $setting_params['value'] ); // Add to post values so that they can be validated and sanitized.
2712			}
2713		}
2714
2715		// Note that in addition to post data, this will include any stashed theme mods.
2716		$post_values = $this->unsanitized_post_values(
2717			array(
2718				'exclude_changeset' => true,
2719				'exclude_post_data' => false,
2720			)
2721		);
2722		$this->add_dynamic_settings( array_keys( $post_values ) ); // Ensure settings get created even if they lack an input value.
2723
2724		/*
2725		 * Get list of IDs for settings that have values different from what is currently
2726		 * saved in the changeset. By skipping any values that are already the same, the
2727		 * subset of changed settings can be passed into validate_setting_values to prevent
2728		 * an underprivileged modifying a single setting for which they have the capability
2729		 * from being blocked from saving. This also prevents a user from touching of the
2730		 * previous saved settings and overriding the associated user_id if they made no change.
2731		 */
2732		$changed_setting_ids = array();
2733		foreach ( $post_values as $setting_id => $setting_value ) {
2734			$setting = $this->get_setting( $setting_id );
2735
2736			if ( $setting && 'theme_mod' === $setting->type ) {
2737				$prefixed_setting_id = $this->get_stylesheet() . '::' . $setting->id;
2738			} else {
2739				$prefixed_setting_id = $setting_id;
2740			}
2741
2742			$is_value_changed = (
2743				! isset( $existing_changeset_data[ $prefixed_setting_id ] )
2744				||
2745				! array_key_exists( 'value', $existing_changeset_data[ $prefixed_setting_id ] )
2746				||
2747				$existing_changeset_data[ $prefixed_setting_id ]['value'] !== $setting_value
2748			);
2749			if ( $is_value_changed ) {
2750				$changed_setting_ids[] = $setting_id;
2751			}
2752		}
2753
2754		/**
2755		 * Fires before save validation happens.
2756		 *
2757		 * Plugins can add just-in-time {@see 'customize_validate_{$this->ID}'} filters
2758		 * at this point to catch any settings registered after `customize_register`.
2759		 * The dynamic portion of the hook name, `$this->ID` refers to the setting ID.
2760		 *
2761		 * @since 4.6.0
2762		 *
2763		 * @param WP_Customize_Manager $this WP_Customize_Manager instance.
2764		 */
2765		do_action( 'customize_save_validation_before', $this );
2766
2767		// Validate settings.
2768		$validated_values      = array_merge(
2769			array_fill_keys( array_keys( $args['data'] ), null ), // Make sure existence/capability checks are done on value-less setting updates.
2770			$post_values
2771		);
2772		$setting_validities    = $this->validate_setting_values(
2773			$validated_values,
2774			array(
2775				'validate_capability' => true,
2776				'validate_existence'  => true,
2777			)
2778		);
2779		$invalid_setting_count = count( array_filter( $setting_validities, 'is_wp_error' ) );
2780
2781		/*
2782		 * Short-circuit if there are invalid settings the update is transactional.
2783		 * A changeset update is transactional when a status is supplied in the request.
2784		 */
2785		if ( $update_transactionally && $invalid_setting_count > 0 ) {
2786			$response = array(
2787				'setting_validities' => $setting_validities,
2788				/* translators: %s: Number of invalid settings. */
2789				'message'            => sprintf( _n( 'Unable to save due to %s invalid setting.', 'Unable to save due to %s invalid settings.', $invalid_setting_count ), number_format_i18n( $invalid_setting_count ) ),
2790			);
2791			return new WP_Error( 'transaction_fail', '', $response );
2792		}
2793
2794		// Obtain/merge data for changeset.
2795		$original_changeset_data = $this->get_changeset_post_data( $changeset_post_id );
2796		$data                    = $original_changeset_data;
2797		if ( is_wp_error( $data ) ) {
2798			$data = array();
2799		}
2800
2801		// Ensure that all post values are included in the changeset data.
2802		foreach ( $post_values as $setting_id => $post_value ) {
2803			if ( ! isset( $args['data'][ $setting_id ] ) ) {
2804				$args['data'][ $setting_id ] = array();
2805			}
2806			if ( ! isset( $args['data'][ $setting_id ]['value'] ) ) {
2807				$args['data'][ $setting_id ]['value'] = $post_value;
2808			}
2809		}
2810
2811		foreach ( $args['data'] as $setting_id => $setting_params ) {
2812			$setting = $this->get_setting( $setting_id );
2813			if ( ! $setting || ! $setting->check_capabilities() ) {
2814				continue;
2815			}
2816
2817			// Skip updating changeset for invalid setting values.
2818			if ( isset( $setting_validities[ $setting_id ] ) && is_wp_error( $setting_validities[ $setting_id ] ) ) {
2819				continue;
2820			}
2821
2822			$changeset_setting_id = $setting_id;
2823			if ( 'theme_mod' === $setting->type ) {
2824				$changeset_setting_id = sprintf( '%s::%s', $this->get_stylesheet(), $setting_id );
2825			}
2826
2827			if ( null === $setting_params ) {
2828				// Remove setting from changeset entirely.
2829				unset( $data[ $changeset_setting_id ] );
2830			} else {
2831
2832				if ( ! isset( $data[ $changeset_setting_id ] ) ) {
2833					$data[ $changeset_setting_id ] = array();
2834				}
2835
2836				// Merge any additional setting params that have been supplied with the existing params.
2837				$merged_setting_params = array_merge( $data[ $changeset_setting_id ], $setting_params );
2838
2839				// Skip updating setting params if unchanged (ensuring the user_id is not overwritten).
2840				if ( $data[ $changeset_setting_id ] === $merged_setting_params ) {
2841					continue;
2842				}
2843
2844				$data[ $changeset_setting_id ] = array_merge(
2845					$merged_setting_params,
2846					array(
2847						'type'              => $setting->type,
2848						'user_id'           => $args['user_id'],
2849						'date_modified_gmt' => current_time( 'mysql', true ),
2850					)
2851				);
2852
2853				// Clear starter_content flag in data if changeset is not explicitly being updated for starter content.
2854				if ( empty( $args['starter_content'] ) ) {
2855					unset( $data[ $changeset_setting_id ]['starter_content'] );
2856				}
2857			}
2858		}
2859
2860		$filter_context = array(
2861			'uuid'          => $this->changeset_uuid(),
2862			'title'         => $args['title'],
2863			'status'        => $args['status'],
2864			'date_gmt'      => $args['date_gmt'],
2865			'post_id'       => $changeset_post_id,
2866			'previous_data' => is_wp_error( $original_changeset_data ) ? array() : $original_changeset_data,
2867			'manager'       => $this,
2868		);
2869
2870		/**
2871		 * Filters the settings' data that will be persisted into the changeset.
2872		 *
2873		 * Plugins may amend additional data (such as additional meta for settings) into the changeset with this filter.
2874		 *
2875		 * @since 4.7.0
2876		 *
2877		 * @param array $data Updated changeset data, mapping setting IDs to arrays containing a $value item and optionally other metadata.
2878		 * @param array $context {
2879		 *     Filter context.
2880		 *
2881		 *     @type string               $uuid          Changeset UUID.
2882		 *     @type string               $title         Requested title for the changeset post.
2883		 *     @type string               $status        Requested status for the changeset post.
2884		 *     @type string               $date_gmt      Requested date for the changeset post in MySQL format and GMT timezone.
2885		 *     @type int|false            $post_id       Post ID for the changeset, or false if it doesn't exist yet.
2886		 *     @type array                $previous_data Previous data contained in the changeset.
2887		 *     @type WP_Customize_Manager $manager       Manager instance.
2888		 * }
2889		 */
2890		$data = apply_filters( 'customize_changeset_save_data', $data, $filter_context );
2891
2892		// Switch theme if publishing changes now.
2893		if ( 'publish' === $args['status'] && ! $this->is_theme_active() ) {
2894			// Temporarily stop previewing the theme to allow switch_themes() to operate properly.
2895			$this->stop_previewing_theme();
2896			switch_theme( $this->get_stylesheet() );
2897			update_option( 'theme_switched_via_customizer', true );
2898			$this->start_previewing_theme();
2899		}
2900
2901		// Gather the data for wp_insert_post()/wp_update_post().
2902		$post_array = array(
2903			// JSON_UNESCAPED_SLASHES is only to improve readability as slashes needn't be escaped in storage.
2904			'post_content' => wp_json_encode( $data, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT ),
2905		);
2906		if ( $args['title'] ) {
2907			$post_array['post_title'] = $args['title'];
2908		}
2909		if ( $changeset_post_id ) {
2910			$post_array['ID'] = $changeset_post_id;
2911		} else {
2912			$post_array['post_type']   = 'customize_changeset';
2913			$post_array['post_name']   = $this->changeset_uuid();
2914			$post_array['post_status'] = 'auto-draft';
2915		}
2916		if ( $args['status'] ) {
2917			$post_array['post_status'] = $args['status'];
2918		}
2919
2920		// Reset post date to now if we are publishing, otherwise pass post_date_gmt and translate for post_date.
2921		if ( 'publish' === $args['status'] ) {
2922			$post_array['post_date_gmt'] = '0000-00-00 00:00:00';
2923			$post_array['post_date']     = '0000-00-00 00:00:00';
2924		} elseif ( $args['date_gmt'] ) {
2925			$post_array['post_date_gmt'] = $args['date_gmt'];
2926			$post_array['post_date']     = get_date_from_gmt( $args['date_gmt'] );
2927		} elseif ( $changeset_post_id && 'auto-draft' === get_post_status( $changeset_post_id ) ) {
2928			/*
2929			 * Keep bumping the date for the auto-draft whenever it is modified;
2930			 * this extends its life, preserving it from garbage-collection via
2931			 * wp_delete_auto_drafts().
2932			 */
2933			$post_array['post_date']     = current_time( 'mysql' );
2934			$post_array['post_date_gmt'] = '';
2935		}
2936
2937		$this->store_changeset_revision = $allow_revision;
2938		add_filter( 'wp_save_post_revision_post_has_changed', array( $this, '_filter_revision_post_has_changed' ), 5, 3 );
2939
2940		/*
2941		 * Update the changeset post. The publish_customize_changeset action will cause the settings in the
2942		 * changeset to be saved via WP_Customize_Setting::save(). Updating a post with publish status will
2943		 * trigger WP_Customize_Manager::publish_changeset_values().
2944		 */
2945		add_filter( 'wp_insert_post_data', array( $this, 'preserve_insert_changeset_post_content' ), 5, 3 );
2946		if ( $changeset_post_id ) {
2947			if ( $args['autosave'] && 'auto-draft' !== get_post_status( $changeset_post_id ) ) {
2948				// See _wp_translate_postdata() for why this is required as it will use the edit_post meta capability.
2949				add_filter( 'map_meta_cap', array( $this, 'grant_edit_post_capability_for_changeset' ), 10, 4 );
2950
2951				$post_array['post_ID']   = $post_array['ID'];
2952				$post_array['post_type'] = 'customize_changeset';
2953
2954				$r = wp_create_post_autosave( wp_slash( $post_array ) );
2955
2956				remove_filter( 'map_meta_cap', array( $this, 'grant_edit_post_capability_for_changeset' ), 10 );
2957			} else {
2958				$post_array['edit_date'] = true; // Prevent date clearing.
2959
2960				$r = wp_update_post( wp_slash( $post_array ), true );
2961
2962				// Delete autosave revision for user when the changeset is updated.
2963				if ( ! empty( $args['user_id'] ) ) {
2964					$autosave_draft = wp_get_post_autosave( $changeset_post_id, $args['user_id'] );
2965					if ( $autosave_draft ) {
2966						wp_delete_post( $autosave_draft->ID, true );
2967					}
2968				}
2969			}
2970		} else {
2971			$r = wp_insert_post( wp_slash( $post_array ), true );
2972			if ( ! is_wp_error( $r ) ) {
2973				$this->_changeset_post_id = $r; // Update cached post ID for the loaded changeset.
2974			}
2975		}
2976		remove_filter( 'wp_insert_post_data', array( $this, 'preserve_insert_changeset_post_content' ), 5 );
2977
2978		$this->_changeset_data = null; // Reset so WP_Customize_Manager::changeset_data() will re-populate with updated contents.
2979
2980		remove_filter( 'wp_save_post_revision_post_has_changed', array( $this, '_filter_revision_post_has_changed' ) );
2981
2982		$response = array(
2983			'setting_validities' => $setting_validities,
2984		);
2985
2986		if ( is_wp_error( $r ) ) {
2987			$response['changeset_post_save_failure'] = $r->get_error_code();
2988			return new WP_Error( 'changeset_post_save_failure', '', $response );
2989		}
2990
2991		return $response;
2992	}
2993
2994	/**
2995	 * Preserve the initial JSON post_content passed to save into the post.
2996	 *
2997	 * This is needed to prevent KSES and other {@see 'content_save_pre'} filters
2998	 * from corrupting JSON data.
2999	 *
3000	 * Note that WP_Customize_Manager::validate_setting_values() have already
3001	 * run on the setting values being serialized as JSON into the post content
3002	 * so it is pre-sanitized.
3003	 *
3004	 * Also, the sanitization logic is re-run through the respective
3005	 * WP_Customize_Setting::sanitize() method when being read out of the
3006	 * changeset, via WP_Customize_Manager::post_value(), and this sanitized
3007	 * value will also be sent into WP_Customize_Setting::update() for
3008	 * persisting to the DB.
3009	 *
3010	 * Multiple users can collaborate on a single changeset, where one user may
3011	 * have the unfiltered_html capability but another may not. A user with
3012	 * unfiltered_html may add a script tag to some field which needs to be kept
3013	 * intact even when another user updates the changeset to modify another field
3014	 * when they do not have unfiltered_html.
3015	 *
3016	 * @since 5.4.1
3017	 *
3018	 * @param array $data                An array of slashed and processed post data.
3019	 * @param array $postarr             An array of sanitized (and slashed) but otherwise unmodified post data.
3020	 * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as originally passed to wp_insert_post().
3021	 * @return array Filtered post data.
3022	 */
3023	public function preserve_insert_changeset_post_content( $data, $postarr, $unsanitized_postarr ) {
3024		if (
3025			isset( $data['post_type'] ) &&
3026			isset( $unsanitized_postarr['post_content'] ) &&
3027			'customize_changeset' === $data['post_type'] ||
3028			(
3029				'revision' === $data['post_type'] &&
3030				! empty( $data['post_parent'] ) &&
3031				'customize_changeset' === get_post_type( $data['post_parent'] )
3032			)
3033		) {
3034			$data['post_content'] = $unsanitized_postarr['post_content'];
3035		}
3036		return $data;
3037	}
3038
3039	/**
3040	 * Trash or delete a changeset post.
3041	 *
3042	 * The following re-formulates the logic from `wp_trash_post()` as done in
3043	 * `wp_publish_post()`. The reason for bypassing `wp_trash_post()` is that it
3044	 * will mutate the the `post_content` and the `post_name` when they should be
3045	 * untouched.
3046	 *
3047	 * @since 4.9.0
3048	 *
3049	 * @see wp_trash_post()
3050	 * @global wpdb $wpdb WordPress database abstraction object.
3051	 *
3052	 * @param int|WP_Post $post The changeset post.
3053	 * @return mixed A WP_Post object for the trashed post or an empty value on failure.
3054	 */
3055	public function trash_changeset_post( $post ) {
3056		global $wpdb;
3057
3058		$post = get_post( $post );
3059
3060		if ( ! ( $post instanceof WP_Post ) ) {
3061			return $post;
3062		}
3063		$post_id = $post->ID;
3064
3065		if ( ! EMPTY_TRASH_DAYS ) {
3066			return wp_delete_post( $post_id, true );
3067		}
3068
3069		if ( 'trash' === get_post_status( $post ) ) {
3070			return false;
3071		}
3072
3073		/** This filter is documented in wp-includes/post.php */
3074		$check = apply_filters( 'pre_trash_post', null, $post );
3075		if ( null !== $check ) {
3076			return $check;
3077		}
3078
3079		/** This action is documented in wp-includes/post.php */
3080		do_action( 'wp_trash_post', $post_id );
3081
3082		add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
3083		add_post_meta( $post_id, '_wp_trash_meta_time', time() );
3084
3085		$old_status = $post->post_status;
3086		$new_status = 'trash';
3087		$wpdb->update( $wpdb->posts, array( 'post_status' => $new_status ), array( 'ID' => $post->ID ) );
3088		clean_post_cache( $post->ID );
3089
3090		$post->post_status = $new_status;
3091		wp_transition_post_status( $new_status, $old_status, $post );
3092
3093		/** This action is documented in wp-includes/post.php */
3094		do_action( "edit_post_{$post->post_type}", $post->ID, $post );
3095
3096		/** This action is documented in wp-includes/post.php */
3097		do_action( 'edit_post', $post->ID, $post );
3098
3099		/** This action is documented in wp-includes/post.php */
3100		do_action( "save_post_{$post->post_type}", $post->ID, $post, true );
3101
3102		/** This action is documented in wp-includes/post.php */
3103		do_action( 'save_post', $post->ID, $post, true );
3104
3105		/** This action is documented in wp-includes/post.php */
3106		do_action( 'wp_insert_post', $post->ID, $post, true );
3107
3108		wp_after_insert_post( get_post( $post_id ), true, $post );
3109
3110		wp_trash_post_comments( $post_id );
3111
3112		/** This action is documented in wp-includes/post.php */
3113		do_action( 'trashed_post', $post_id );
3114
3115		return $post;
3116	}
3117
3118	/**
3119	 * Handle request to trash a changeset.
3120	 *
3121	 * @since 4.9.0
3122	 */
3123	public function handle_changeset_trash_request() {
3124		if ( ! is_user_logged_in() ) {
3125			wp_send_json_error( 'unauthenticated' );
3126		}
3127
3128		if ( ! $this->is_preview() ) {
3129			wp_send_json_error( 'not_preview' );
3130		}
3131
3132		if ( ! check_ajax_referer( 'trash_customize_changeset', 'nonce', false ) ) {
3133			wp_send_json_error(
3134				array(
3135					'code'    => 'invalid_nonce',
3136					'message' => __( 'There was an authentication problem. Please reload and try again.' ),
3137				)
3138			);
3139		}
3140
3141		$changeset_post_id = $this->changeset_post_id();
3142
3143		if ( ! $changeset_post_id ) {
3144			wp_send_json_error(
3145				array(
3146					'message' => __( 'No changes saved yet, so there is nothing to trash.' ),
3147					'code'    => 'non_existent_changeset',
3148				)
3149			);
3150			return;
3151		}
3152
3153		if ( $changeset_post_id ) {
3154			if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->delete_post, $changeset_post_id ) ) {
3155				wp_send_json_error(
3156					array(
3157						'code'    => 'changeset_trash_unauthorized',
3158						'message' => __( 'Unable to trash changes.' ),
3159					)
3160				);
3161			}
3162
3163			$lock_user = (int) wp_check_post_lock( $changeset_post_id );
3164
3165			if ( $lock_user && get_current_user_id() !== $lock_user ) {
3166				wp_send_json_error(
3167					array(
3168						'code'     => 'changeset_locked',
3169						'message'  => __( 'Changeset is being edited by other user.' ),
3170						'lockUser' => $this->get_lock_user_data( $lock_user ),
3171					)
3172				);
3173			}
3174		}
3175
3176		if ( 'trash' === get_post_status( $changeset_post_id ) ) {
3177			wp_send_json_error(
3178				array(
3179					'message' => __( 'Changes have already been trashed.' ),
3180					'code'    => 'changeset_already_trashed',
3181				)
3182			);
3183			return;
3184		}
3185
3186		$r = $this->trash_changeset_post( $changeset_post_id );
3187		if ( ! ( $r instanceof WP_Post ) ) {
3188			wp_send_json_error(
3189				array(
3190					'code'    => 'changeset_trash_failure',
3191					'message' => __( 'Unable to trash changes.' ),
3192				)
3193			);
3194		}
3195
3196		wp_send_json_success(
3197			array(
3198				'message' => __( 'Changes trashed successfully.' ),
3199			)
3200		);
3201	}
3202
3203	/**
3204	 * Re-map 'edit_post' meta cap for a customize_changeset post to be the same as 'customize' maps.
3205	 *
3206	 * There is essentially a "meta meta" cap in play here, where 'edit_post' meta cap maps to
3207	 * the 'customize' meta cap which then maps to 'edit_theme_options'. This is currently
3208	 * required in core for `wp_create_post_autosave()` because it will call
3209	 * `_wp_translate_postdata()` which in turn will check if a user can 'edit_post', but the
3210	 * the caps for the customize_changeset post type are all mapping to the meta capability.
3211	 * This should be able to be removed once #40922 is addressed in core.
3212	 *
3213	 * @since 4.9.0
3214	 *
3215	 * @link https://core.trac.wordpress.org/ticket/40922
3216	 * @see WP_Customize_Manager::save_changeset_post()
3217	 * @see _wp_translate_postdata()
3218	 *
3219	 * @param string[] $caps    Array of the user's capabilities.
3220	 * @param string   $cap     Capability name.
3221	 * @param int      $user_id The user ID.
3222	 * @param array    $args    Adds the context to the cap. Typically the object ID.
3223	 * @return array Capabilities.
3224	 */
3225	public function grant_edit_post_capability_for_changeset( $caps, $cap, $user_id, $args ) {
3226		if ( 'edit_post' === $cap && ! empty( $args[0] ) && 'customize_changeset' === get_post_type( $args[0] ) ) {
3227			$post_type_obj = get_post_type_object( 'customize_changeset' );
3228			$caps          = map_meta_cap( $post_type_obj->cap->$cap, $user_id );
3229		}
3230		return $caps;
3231	}
3232
3233	/**
3234	 * Marks the changeset post as being currently edited by the current user.
3235	 *
3236	 * @since 4.9.0
3237	 *
3238	 * @param int  $changeset_post_id Changeset post ID.
3239	 * @param bool $take_over Whether to take over the changeset. Default false.
3240	 */
3241	public function set_changeset_lock( $changeset_post_id, $take_over = false ) {
3242		if ( $changeset_post_id ) {
3243			$can_override = ! (bool) get_post_meta( $changeset_post_id, '_edit_lock', true );
3244
3245			if ( $take_over ) {
3246				$can_override = true;
3247			}
3248
3249			if ( $can_override ) {
3250				$lock = sprintf( '%s:%s', time(), get_current_user_id() );
3251				update_post_meta( $changeset_post_id, '_edit_lock', $lock );
3252			} else {
3253				$this->refresh_changeset_lock( $changeset_post_id );
3254			}
3255		}
3256	}
3257
3258	/**
3259	 * Refreshes changeset lock with the current time if current user edited the changeset before.
3260	 *
3261	 * @since 4.9.0
3262	 *
3263	 * @param int $changeset_post_id Changeset post ID.
3264	 */
3265	public function refresh_changeset_lock( $changeset_post_id ) {
3266		if ( ! $changeset_post_id ) {
3267			return;
3268		}
3269		$lock = get_post_meta( $changeset_post_id, '_edit_lock', true );
3270		$lock = explode( ':', $lock );
3271
3272		if ( $lock && ! empty( $lock[1] ) ) {
3273			$user_id         = (int) $lock[1];
3274			$current_user_id = get_current_user_id();
3275			if ( $user_id === $current_user_id ) {
3276				$lock = sprintf( '%s:%s', time(), $user_id );
3277				update_post_meta( $changeset_post_id, '_edit_lock', $lock );
3278			}
3279		}
3280	}
3281
3282	/**
3283	 * Filters heartbeat settings for the Customizer.
3284	 *
3285	 * @since 4.9.0
3286	 * @param array $settings Current settings to filter.
3287	 * @return array Heartbeat settings.
3288	 */
3289	public function add_customize_screen_to_heartbeat_settings( $settings ) {
3290		global $pagenow;
3291		if ( 'customize.php' === $pagenow ) {
3292			$settings['screenId'] = 'customize';
3293		}
3294		return $settings;
3295	}
3296
3297	/**
3298	 * Get lock user data.
3299	 *
3300	 * @since 4.9.0
3301	 *
3302	 * @param int $user_id User ID.
3303	 * @return array|null User data formatted for client.
3304	 */
3305	protected function get_lock_user_data( $user_id ) {
3306		if ( ! $user_id ) {
3307			return null;
3308		}
3309		$lock_user = get_userdata( $user_id );
3310		if ( ! $lock_user ) {
3311			return null;
3312		}
3313		return array(
3314			'id'     => $lock_user->ID,
3315			'name'   => $lock_user->display_name,
3316			'avatar' => get_avatar_url( $lock_user->ID, array( 'size' => 128 ) ),
3317		);
3318	}
3319
3320	/**
3321	 * Check locked changeset with heartbeat API.
3322	 *
3323	 * @since 4.9.0
3324	 *
3325	 * @param array  $response  The Heartbeat response.
3326	 * @param array  $data      The $_POST data sent.
3327	 * @param string $screen_id The screen id.
3328	 * @return array The Heartbeat response.
3329	 */
3330	public function check_changeset_lock_with_heartbeat( $response, $data, $screen_id ) {
3331		if ( isset( $data['changeset_uuid'] ) ) {
3332			$changeset_post_id = $this->find_changeset_post_id( $data['changeset_uuid'] );
3333		} else {
3334			$changeset_post_id = $this->changeset_post_id();
3335		}
3336
3337		if (
3338			array_key_exists( 'check_changeset_lock', $data )
3339			&& 'customize' === $screen_id
3340			&& $changeset_post_id
3341			&& current_user_can( get_post_type_object( 'customize_changeset' )->cap->edit_post, $changeset_post_id )
3342		) {
3343			$lock_user_id = wp_check_post_lock( $changeset_post_id );
3344
3345			if ( $lock_user_id ) {
3346				$response['customize_changeset_lock_user'] = $this->get_lock_user_data( $lock_user_id );
3347			} else {
3348
3349				// Refreshing time will ensure that the user is sitting on customizer and has not closed the customizer tab.
3350				$this->refresh_changeset_lock( $changeset_post_id );
3351			}
3352		}
3353
3354		return $response;
3355	}
3356
3357	/**
3358	 * Removes changeset lock when take over request is sent via Ajax.
3359	 *
3360	 * @since 4.9.0
3361	 */
3362	public function handle_override_changeset_lock_request() {
3363		if ( ! $this->is_preview() ) {
3364			wp_send_json_error( 'not_preview', 400 );
3365		}
3366
3367		if ( ! check_ajax_referer( 'customize_override_changeset_lock', 'nonce', false ) ) {
3368			wp_send_json_error(
3369				array(
3370					'code'    => 'invalid_nonce',
3371					'message' => __( 'Security check failed.' ),
3372				)
3373			);
3374		}
3375
3376		$changeset_post_id = $this->changeset_post_id();
3377
3378		if ( empty( $changeset_post_id ) ) {
3379			wp_send_json_error(
3380				array(
3381					'code'    => 'no_changeset_found_to_take_over',
3382					'message' => __( 'No changeset found to take over' ),
3383				)
3384			);
3385		}
3386
3387		if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->edit_post, $changeset_post_id ) ) {
3388			wp_send_json_error(
3389				array(
3390					'code'    => 'cannot_remove_changeset_lock',
3391					'message' => __( 'Sorry, you are not allowed to take over.' ),
3392				)
3393			);
3394		}
3395
3396		$this->set_changeset_lock( $changeset_post_id, true );
3397
3398		wp_send_json_success( 'changeset_taken_over' );
3399	}
3400
3401	/**
3402	 * Whether a changeset revision should be made.
3403	 *
3404	 * @since 4.7.0
3405	 * @var bool
3406	 */
3407	protected $store_changeset_revision;
3408
3409	/**
3410	 * Filters whether a changeset has changed to create a new revision.
3411	 *
3412	 * Note that this will not be called while a changeset post remains in auto-draft status.
3413	 *
3414	 * @since 4.7.0
3415	 *
3416	 * @param bool    $post_has_changed Whether the post has changed.
3417	 * @param WP_Post $last_revision    The last revision post object.
3418	 * @param WP_Post $post             The post object.
3419	 * @return bool Whether a revision should be made.
3420	 */
3421	public function _filter_revision_post_has_changed( $post_has_changed, $last_revision, $post ) {
3422		unset( $last_revision );
3423		if ( 'customize_changeset' === $post->post_type ) {
3424			$post_has_changed = $this->store_changeset_revision;
3425		}
3426		return $post_has_changed;
3427	}
3428
3429	/**
3430	 * Publish changeset values.
3431	 *
3432	 * This will the values contained in a changeset, even changesets that do not
3433	 * correspond to current manager instance. This is called by
3434	 * `_wp_customize_publish_changeset()` when a customize_changeset post is
3435	 * transitioned to the `publish` status. As such, this method should not be
3436	 * called directly and instead `wp_publish_post()` should be used.
3437	 *
3438	 * Please note that if the settings in the changeset are for a non-activated
3439	 * theme, the theme must first be switched to (via `switch_theme()`) before
3440	 * invoking this method.
3441	 *
3442	 * @since 4.7.0
3443	 *
3444	 * @see _wp_customize_publish_changeset()
3445	 * @global wpdb $wpdb WordPress database abstraction object.
3446	 *
3447	 * @param int $changeset_post_id ID for customize_changeset post. Defaults to the changeset for the current manager instance.
3448	 * @return true|WP_Error True or error info.
3449	 */
3450	public function _publish_changeset_values( $changeset_post_id ) {
3451		global $wpdb;
3452
3453		$publishing_changeset_data = $this->get_changeset_post_data( $changeset_post_id );
3454		if ( is_wp_error( $publishing_changeset_data ) ) {
3455			return $publishing_changeset_data;
3456		}
3457
3458		$changeset_post = get_post( $changeset_post_id );
3459
3460		/*
3461		 * Temporarily override the changeset context so that it will be read
3462		 * in calls to unsanitized_post_values() and so that it will be available
3463		 * on the $wp_customize object passed to hooks during the save logic.
3464		 */
3465		$previous_changeset_post_id = $this->_changeset_post_id;
3466		$this->_changeset_post_id   = $changeset_post_id;
3467		$previous_changeset_uuid    = $this->_changeset_uuid;
3468		$this->_changeset_uuid      = $changeset_post->post_name;
3469		$previous_changeset_data    = $this->_changeset_data;
3470		$this->_changeset_data      = $publishing_changeset_data;
3471
3472		// Parse changeset data to identify theme mod settings and user IDs associated with settings to be saved.
3473		$setting_user_ids   = array();
3474		$theme_mod_settings = array();
3475		$namespace_pattern  = '/^(?P<stylesheet>.+?)::(?P<setting_id>.+)$/';
3476		$matches            = array();
3477		foreach ( $this->_changeset_data as $raw_setting_id => $setting_params ) {
3478			$actual_setting_id    = null;
3479			$is_theme_mod_setting = (
3480				isset( $setting_params['value'] )
3481				&&
3482				isset( $setting_params['type'] )
3483				&&
3484				'theme_mod' === $setting_params['type']
3485				&&
3486				preg_match( $namespace_pattern, $raw_setting_id, $matches )
3487			);
3488			if ( $is_theme_mod_setting ) {
3489				if ( ! isset( $theme_mod_settings[ $matches['stylesheet'] ] ) ) {
3490					$theme_mod_settings[ $matches['stylesheet'] ] = array();
3491				}
3492				$theme_mod_settings[ $matches['stylesheet'] ][ $matches['setting_id'] ] = $setting_params;
3493
3494				if ( $this->get_stylesheet() === $matches['stylesheet'] ) {
3495					$actual_setting_id = $matches['setting_id'];
3496				}
3497			} else {
3498				$actual_setting_id = $raw_setting_id;
3499			}
3500
3501			// Keep track of the user IDs for settings actually for this theme.
3502			if ( $actual_setting_id && isset( $setting_params['user_id'] ) ) {
3503				$setting_user_ids[ $actual_setting_id ] = $setting_params['user_id'];
3504			}
3505		}
3506
3507		$changeset_setting_values = $this->unsanitized_post_values(
3508			array(
3509				'exclude_post_data' => true,
3510				'exclude_changeset' => false,
3511			)
3512		);
3513		$changeset_setting_ids    = array_keys( $changeset_setting_values );
3514		$this->add_dynamic_settings( $changeset_setting_ids );
3515
3516		/**
3517		 * Fires once the theme has switched in the Customizer, but before settings
3518		 * have been saved.
3519		 *
3520		 * @since 3.4.0
3521		 *
3522		 * @param WP_Customize_Manager $manager WP_Customize_Manager instance.
3523		 */
3524		do_action( 'customize_save', $this );
3525
3526		/*
3527		 * Ensure that all settings will allow themselves to be saved. Note that
3528		 * this is safe because the setting would have checked the capability
3529		 * when the setting value was written into the changeset. So this is why
3530		 * an additional capability check is not required here.
3531		 */
3532		$original_setting_capabilities = array();
3533		foreach ( $changeset_setting_ids as $setting_id ) {
3534			$setting = $this->get_setting( $setting_id );
3535			if ( $setting && ! isset( $setting_user_ids[ $setting_id ] ) ) {
3536				$original_setting_capabilities[ $setting->id ] = $setting->capability;
3537				$setting->capability                           = 'exist';
3538			}
3539		}
3540
3541		$original_user_id = get_current_user_id();
3542		foreach ( $changeset_setting_ids as $setting_id ) {
3543			$setting = $this->get_setting( $setting_id );
3544			if ( $setting ) {
3545				/*
3546				 * Set the current user to match the user who saved the value into
3547				 * the changeset so that any filters that apply during the save
3548				 * process will respect the original user's capabilities. This
3549				 * will ensure, for example, that KSES won't strip unsafe HTML
3550				 * when a scheduled changeset publishes via WP Cron.
3551				 */
3552				if ( isset( $setting_user_ids[ $setting_id ] ) ) {
3553					wp_set_current_user( $setting_user_ids[ $setting_id ] );
3554				} else {
3555					wp_set_current_user( $original_user_id );
3556				}
3557
3558				$setting->save();
3559			}
3560		}
3561		wp_set_current_user( $original_user_id );
3562
3563		// Update the stashed theme mod settings, removing the active theme's stashed settings, if activated.
3564		if ( did_action( 'switch_theme' ) ) {
3565			$other_theme_mod_settings = $theme_mod_settings;
3566			unset( $other_theme_mod_settings[ $this->get_stylesheet() ] );
3567			$this->update_stashed_theme_mod_settings( $other_theme_mod_settings );
3568		}
3569
3570		/**
3571		 * Fires after Customize settings have been saved.
3572		 *
3573		 * @since 3.6.0
3574		 *
3575		 * @param WP_Customize_Manager $manager WP_Customize_Manager instance.
3576		 */
3577		do_action( 'customize_save_after', $this );
3578
3579		// Restore original capabilities.
3580		foreach ( $original_setting_capabilities as $setting_id => $capability ) {
3581			$setting = $this->get_setting( $setting_id );
3582			if ( $setting ) {
3583				$setting->capability = $capability;
3584			}
3585		}
3586
3587		// Restore original changeset data.
3588		$this->_changeset_data    = $previous_changeset_data;
3589		$this->_changeset_post_id = $previous_changeset_post_id;
3590		$this->_changeset_uuid    = $previous_changeset_uuid;
3591
3592		/*
3593		 * Convert all autosave revisions into their own auto-drafts so that users can be prompted to
3594		 * restore them when a changeset is published, but they had been locked out from including
3595		 * their changes in the changeset.
3596		 */
3597		$revisions = wp_get_post_revisions( $changeset_post_id, array( 'check_enabled' => false ) );
3598		foreach ( $revisions as $revision ) {
3599			if ( false !== strpos( $revision->post_name, "{$changeset_post_id}-autosave" ) ) {
3600				$wpdb->update(
3601					$wpdb->posts,
3602					array(
3603						'post_status' => 'auto-draft',
3604						'post_type'   => 'customize_changeset',
3605						'post_name'   => wp_generate_uuid4(),
3606						'post_parent' => 0,
3607					),
3608					array(
3609						'ID' => $revision->ID,
3610					)
3611				);
3612				clean_post_cache( $revision->ID );
3613			}
3614		}
3615
3616		return true;
3617	}
3618
3619	/**
3620	 * Update stashed theme mod settings.
3621	 *
3622	 * @since 4.7.0
3623	 *
3624	 * @param array $inactive_theme_mod_settings Mapping of stylesheet to arrays of theme mod settings.
3625	 * @return array|false Returns array of updated stashed theme mods or false if the update failed or there were no changes.
3626	 */
3627	protected function update_stashed_theme_mod_settings( $inactive_theme_mod_settings ) {
3628		$stashed_theme_mod_settings = get_option( 'customize_stashed_theme_mods' );
3629		if ( empty( $stashed_theme_mod_settings ) ) {
3630			$stashed_theme_mod_settings = array();
3631		}
3632
3633		// Delete any stashed theme mods for the active theme since they would have been loaded and saved upon activation.
3634		unset( $stashed_theme_mod_settings[ $this->get_stylesheet() ] );
3635
3636		// Merge inactive theme mods with the stashed theme mod settings.
3637		foreach ( $inactive_theme_mod_settings as $stylesheet => $theme_mod_settings ) {
3638			if ( ! isset( $stashed_theme_mod_settings[ $stylesheet ] ) ) {
3639				$stashed_theme_mod_settings[ $stylesheet ] = array();
3640			}
3641
3642			$stashed_theme_mod_settings[ $stylesheet ] = array_merge(
3643				$stashed_theme_mod_settings[ $stylesheet ],
3644				$theme_mod_settings
3645			);
3646		}
3647
3648		$autoload = false;
3649		$result   = update_option( 'customize_stashed_theme_mods', $stashed_theme_mod_settings, $autoload );
3650		if ( ! $result ) {
3651			return false;
3652		}
3653		return $stashed_theme_mod_settings;
3654	}
3655
3656	/**
3657	 * Refresh nonces for the current preview.
3658	 *
3659	 * @since 4.2.0
3660	 */
3661	public function refresh_nonces() {
3662		if ( ! $this->is_preview() ) {
3663			wp_send_json_error( 'not_preview' );
3664		}
3665
3666		wp_send_json_success( $this->get_nonces() );
3667	}
3668
3669	/**
3670	 * Delete a given auto-draft changeset or the autosave revision for a given changeset or delete changeset lock.
3671	 *
3672	 * @since 4.9.0
3673	 */
3674	public function handle_dismiss_autosave_or_lock_request() {
3675		// Calls to dismiss_user_auto_draft_changesets() and wp_get_post_autosave() require non-zero get_current_user_id().
3676		if ( ! is_user_logged_in() ) {
3677			wp_send_json_error( 'unauthenticated', 401 );
3678		}
3679
3680		if ( ! $this->is_preview() ) {
3681			wp_send_json_error( 'not_preview', 400 );
3682		}
3683
3684		if ( ! check_ajax_referer( 'customize_dismiss_autosave_or_lock', 'nonce', false ) ) {
3685			wp_send_json_error( 'invalid_nonce', 403 );
3686		}
3687
3688		$changeset_post_id = $this->changeset_post_id();
3689		$dismiss_lock      = ! empty( $_POST['dismiss_lock'] );
3690		$dismiss_autosave  = ! empty( $_POST['dismiss_autosave'] );
3691
3692		if ( $dismiss_lock ) {
3693			if ( empty( $changeset_post_id ) && ! $dismiss_autosave ) {
3694				wp_send_json_error( 'no_changeset_to_dismiss_lock', 404 );
3695			}
3696			if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->edit_post, $changeset_post_id ) && ! $dismiss_autosave ) {
3697				wp_send_json_error( 'cannot_remove_changeset_lock', 403 );
3698			}
3699
3700			delete_post_meta( $changeset_post_id, '_edit_lock' );
3701
3702			if ( ! $dismiss_autosave ) {
3703				wp_send_json_success( 'changeset_lock_dismissed' );
3704			}
3705		}
3706
3707		if ( $dismiss_autosave ) {
3708			if ( empty( $changeset_post_id ) || 'auto-draft' === get_post_status( $changeset_post_id ) ) {
3709				$dismissed = $this->dismiss_user_auto_draft_changesets();
3710				if ( $dismissed > 0 ) {
3711					wp_send_json_success( 'auto_draft_dismissed' );
3712				} else {
3713					wp_send_json_error( 'no_auto_draft_to_delete', 404 );
3714				}
3715			} else {
3716				$revision = wp_get_post_autosave( $changeset_post_id, get_current_user_id() );
3717
3718				if ( $revision ) {
3719					if ( ! current_user_can( get_post_type_object( 'customize_changeset' )->cap->delete_post, $changeset_post_id ) ) {
3720						wp_send_json_error( 'cannot_delete_autosave_revision', 403 );
3721					}
3722
3723					if ( ! wp_delete_post( $revision->ID, true ) ) {
3724						wp_send_json_error( 'autosave_revision_deletion_failure', 500 );
3725					} else {
3726						wp_send_json_success( 'autosave_revision_deleted' );
3727					}
3728				} else {
3729					wp_send_json_error( 'no_autosave_revision_to_delete', 404 );
3730				}
3731			}
3732		}
3733
3734		wp_send_json_error( 'unknown_error', 500 );
3735	}
3736
3737	/**
3738	 * Add a customize setting.
3739	 *
3740	 * @since 3.4.0
3741	 * @since 4.5.0 Return added WP_Customize_Setting instance.
3742	 *
3743	 * @see WP_Customize_Setting::__construct()
3744	 * @link https://developer.wordpress.org/themes/customize-api
3745	 *
3746	 * @param WP_Customize_Setting|string $id   Customize Setting object, or ID.
3747	 * @param array                       $args Optional. Array of properties for the new Setting object.
3748	 *                                          See WP_Customize_Setting::__construct() for information
3749	 *                                          on accepted arguments. Default empty array.
3750	 * @return WP_Customize_Setting The instance of the setting that was added.
3751	 */
3752	public function add_setting( $id, $args = array() ) {
3753		if ( $id instanceof WP_Customize_Setting ) {
3754			$setting = $id;
3755		} else {
3756			$class = 'WP_Customize_Setting';
3757
3758			/** This filter is documented in wp-includes/class-wp-customize-manager.php */
3759			$args = apply_filters( 'customize_dynamic_setting_args', $args, $id );
3760
3761			/** This filter is documented in wp-includes/class-wp-customize-manager.php */
3762			$class = apply_filters( 'customize_dynamic_setting_class', $class, $id, $args );
3763
3764			$setting = new $class( $this, $id, $args );
3765		}
3766
3767		$this->settings[ $setting->id ] = $setting;
3768		return $setting;
3769	}
3770
3771	/**
3772	 * Register any dynamically-created settings, such as those from $_POST['customized']
3773	 * that have no corresponding setting created.
3774	 *
3775	 * This is a mechanism to "wake up" settings that have been dynamically created
3776	 * on the front end and have been sent to WordPress in `$_POST['customized']`. When WP
3777	 * loads, the dynamically-created settings then will get created and previewed
3778	 * even though they are not directly created statically with code.
3779	 *
3780	 * @since 4.2.0
3781	 *
3782	 * @param array $setting_ids The setting IDs to add.
3783	 * @return array The WP_Customize_Setting objects added.
3784	 */
3785	public function add_dynamic_settings( $setting_ids ) {
3786		$new_settings = array();
3787		foreach ( $setting_ids as $setting_id ) {
3788			// Skip settings already created.
3789			if ( $this->get_setting( $setting_id ) ) {
3790				continue;
3791			}
3792
3793			$setting_args  = false;
3794			$setting_class = 'WP_Customize_Setting';
3795
3796			/**
3797			 * Filters a dynamic setting's constructor args.
3798			 *
3799			 * For a dynamic setting to be registered, this filter must be employed
3800			 * to override the default false value with an array of args to pass to
3801			 * the WP_Customize_Setting constructor.
3802			 *
3803			 * @since 4.2.0
3804			 *
3805			 * @param false|array $setting_args The arguments to the WP_Customize_Setting constructor.
3806			 * @param string      $setting_id   ID for dynamic setting, usually coming from `$_POST['customized']`.
3807			 */
3808			$setting_args = apply_filters( 'customize_dynamic_setting_args', $setting_args, $setting_id );
3809			if ( false === $setting_args ) {
3810				continue;
3811			}
3812
3813			/**
3814			 * Allow non-statically created settings to be constructed with custom WP_Customize_Setting subclass.
3815			 *
3816			 * @since 4.2.0
3817			 *
3818			 * @param string $setting_class WP_Customize_Setting or a subclass.
3819			 * @param string $setting_id    ID for dynamic setting, usually coming from `$_POST['customized']`.
3820			 * @param array  $setting_args  WP_Customize_Setting or a subclass.
3821			 */
3822			$setting_class = apply_filters( 'customize_dynamic_setting_class', $setting_class, $setting_id, $setting_args );
3823
3824			$setting = new $setting_class( $this, $setting_id, $setting_args );
3825
3826			$this->add_setting( $setting );
3827			$new_settings[] = $setting;
3828		}
3829		return $new_settings;
3830	}
3831
3832	/**
3833	 * Retrieve a customize setting.
3834	 *
3835	 * @since 3.4.0
3836	 *
3837	 * @param string $id Customize Setting ID.
3838	 * @return WP_Customize_Setting|void The setting, if set.
3839	 */
3840	public function get_setting( $id ) {
3841		if ( isset( $this->settings[ $id ] ) ) {
3842			return $this->settings[ $id ];
3843		}
3844	}
3845
3846	/**
3847	 * Remove a customize setting.
3848	 *
3849	 * Note that removing the setting doesn't destroy the WP_Customize_Setting instance or remove its filters.
3850	 *
3851	 * @since 3.4.0
3852	 *
3853	 * @param string $id Customize Setting ID.
3854	 */
3855	public function remove_setting( $id ) {
3856		unset( $this->settings[ $id ] );
3857	}
3858
3859	/**
3860	 * Add a customize panel.
3861	 *
3862	 * @since 4.0.0
3863	 * @since 4.5.0 Return added WP_Customize_Panel instance.
3864	 *
3865	 * @see WP_Customize_Panel::__construct()
3866	 *
3867	 * @param WP_Customize_Panel|string $id   Customize Panel object, or ID.
3868	 * @param array                     $args Optional. Array of properties for the new Panel object.
3869	 *                                        See WP_Customize_Panel::__construct() for information
3870	 *                                        on accepted arguments. Default empty array.
3871	 * @return WP_Customize_Panel The instance of the panel that was added.
3872	 */
3873	public function add_panel( $id, $args = array() ) {
3874		if ( $id instanceof WP_Customize_Panel ) {
3875			$panel = $id;
3876		} else {
3877			$panel = new WP_Customize_Panel( $this, $id, $args );
3878		}
3879
3880		$this->panels[ $panel->id ] = $panel;
3881		return $panel;
3882	}
3883
3884	/**
3885	 * Retrieve a customize panel.
3886	 *
3887	 * @since 4.0.0
3888	 *
3889	 * @param string $id Panel ID to get.
3890	 * @return WP_Customize_Panel|void Requested panel instance, if set.
3891	 */
3892	public function get_panel( $id ) {
3893		if ( isset( $this->panels[ $id ] ) ) {
3894			return $this->panels[ $id ];
3895		}
3896	}
3897
3898	/**
3899	 * Remove a customize panel.
3900	 *
3901	 * Note that removing the panel doesn't destroy the WP_Customize_Panel instance or remove its filters.
3902	 *
3903	 * @since 4.0.0
3904	 *
3905	 * @param string $id Panel ID to remove.
3906	 */
3907	public function remove_panel( $id ) {
3908		// Removing core components this way is _doing_it_wrong().
3909		if ( in_array( $id, $this->components, true ) ) {
3910			_doing_it_wrong(
3911				__METHOD__,
3912				sprintf(
3913					/* translators: 1: Panel ID, 2: Link to 'customize_loaded_components' filter reference. */
3914					__( 'Removing %1$s manually will cause PHP warnings. Use the %2$s filter instead.' ),
3915					$id,
3916					sprintf(
3917						'<a href="%1$s">%2$s</a>',
3918						esc_url( 'https://developer.wordpress.org/reference/hooks/customize_loaded_components/' ),
3919						'<code>customize_loaded_components</code>'
3920					)
3921				),
3922				'4.5.0'
3923			);
3924		}
3925		unset( $this->panels[ $id ] );
3926	}
3927
3928	/**
3929	 * Register a customize panel type.
3930	 *
3931	 * Registered types are eligible to be rendered via JS and created dynamically.
3932	 *
3933	 * @since 4.3.0
3934	 *
3935	 * @see WP_Customize_Panel
3936	 *
3937	 * @param string $panel Name of a custom panel which is a subclass of WP_Customize_Panel.
3938	 */
3939	public function register_panel_type( $panel ) {
3940		$this->registered_panel_types[] = $panel;
3941	}
3942
3943	/**
3944	 * Render JS templates for all registered panel types.
3945	 *
3946	 * @since 4.3.0
3947	 */
3948	public function render_panel_templates() {
3949		foreach ( $this->registered_panel_types as $panel_type ) {
3950			$panel = new $panel_type( $this, 'temp', array() );
3951			$panel->print_template();
3952		}
3953	}
3954
3955	/**
3956	 * Add a customize section.
3957	 *
3958	 * @since 3.4.0
3959	 * @since 4.5.0 Return added WP_Customize_Section instance.
3960	 *
3961	 * @see WP_Customize_Section::__construct()
3962	 *
3963	 * @param WP_Customize_Section|string $id   Customize Section object, or ID.
3964	 * @param array                       $args Optional. Array of properties for the new Section object.
3965	 *                                          See WP_Customize_Section::__construct() for information
3966	 *                                          on accepted arguments. Default empty array.
3967	 * @return WP_Customize_Section The instance of the section that was added.
3968	 */
3969	public function add_section( $id, $args = array() ) {
3970		if ( $id instanceof WP_Customize_Section ) {
3971			$section = $id;
3972		} else {
3973			$section = new WP_Customize_Section( $this, $id, $args );
3974		}
3975
3976		$this->sections[ $section->id ] = $section;
3977		return $section;
3978	}
3979
3980	/**
3981	 * Retrieve a customize section.
3982	 *
3983	 * @since 3.4.0
3984	 *
3985	 * @param string $id Section ID.
3986	 * @return WP_Customize_Section|void The section, if set.
3987	 */
3988	public function get_section( $id ) {
3989		if ( isset( $this->sections[ $id ] ) ) {
3990			return $this->sections[ $id ];
3991		}
3992	}
3993
3994	/**
3995	 * Remove a customize section.
3996	 *
3997	 * Note that removing the section doesn't destroy the WP_Customize_Section instance or remove its filters.
3998	 *
3999	 * @since 3.4.0
4000	 *
4001	 * @param string $id Section ID.
4002	 */
4003	public function remove_section( $id ) {
4004		unset( $this->sections[ $id ] );
4005	}
4006
4007	/**
4008	 * Register a customize section type.
4009	 *
4010	 * Registered types are eligible to be rendered via JS and created dynamically.
4011	 *
4012	 * @since 4.3.0
4013	 *
4014	 * @see WP_Customize_Section
4015	 *
4016	 * @param string $section Name of a custom section which is a subclass of WP_Customize_Section.
4017	 */
4018	public function register_section_type( $section ) {
4019		$this->registered_section_types[] = $section;
4020	}
4021
4022	/**
4023	 * Render JS templates for all registered section types.
4024	 *
4025	 * @since 4.3.0
4026	 */
4027	public function render_section_templates() {
4028		foreach ( $this->registered_section_types as $section_type ) {
4029			$section = new $section_type( $this, 'temp', array() );
4030			$section->print_template();
4031		}
4032	}
4033
4034	/**
4035	 * Add a customize control.
4036	 *
4037	 * @since 3.4.0
4038	 * @since 4.5.0 Return added WP_Customize_Control instance.
4039	 *
4040	 * @see WP_Customize_Control::__construct()
4041	 *
4042	 * @param WP_Customize_Control|string $id   Customize Control object, or ID.
4043	 * @param array                       $args Optional. Array of properties for the new Control object.
4044	 *                                          See WP_Customize_Control::__construct() for information
4045	 *                                          on accepted arguments. Default empty array.
4046	 * @return WP_Customize_Control The instance of the control that was added.
4047	 */
4048	public function add_control( $id, $args = array() ) {
4049		if ( $id instanceof WP_Customize_Control ) {
4050			$control = $id;
4051		} else {
4052			$control = new WP_Customize_Control( $this, $id, $args );
4053		}
4054
4055		$this->controls[ $control->id ] = $control;
4056		return $control;
4057	}
4058
4059	/**
4060	 * Retrieve a customize control.
4061	 *
4062	 * @since 3.4.0
4063	 *
4064	 * @param string $id ID of the control.
4065	 * @return WP_Customize_Control|void The control object, if set.
4066	 */
4067	public function get_control( $id ) {
4068		if ( isset( $this->controls[ $id ] ) ) {
4069			return $this->controls[ $id ];
4070		}
4071	}
4072
4073	/**
4074	 * Remove a customize control.
4075	 *
4076	 * Note that removing the control doesn't destroy the WP_Customize_Control instance or remove its filters.
4077	 *
4078	 * @since 3.4.0
4079	 *
4080	 * @param string $id ID of the control.
4081	 */
4082	public function remove_control( $id ) {
4083		unset( $this->controls[ $id ] );
4084	}
4085
4086	/**
4087	 * Register a customize control type.
4088	 *
4089	 * Registered types are eligible to be rendered via JS and created dynamically.
4090	 *
4091	 * @since 4.1.0
4092	 *
4093	 * @param string $control Name of a custom control which is a subclass of
4094	 *                        WP_Customize_Control.
4095	 */
4096	public function register_control_type( $control ) {
4097		$this->registered_control_types[] = $control;
4098	}
4099
4100	/**
4101	 * Render JS templates for all registered control types.
4102	 *
4103	 * @since 4.1.0
4104	 */
4105	public function render_control_templates() {
4106		if ( $this->branching() ) {
4107			$l10n = array(
4108				/* translators: %s: User who is customizing the changeset in customizer. */
4109				'locked'                => __( '%s is already customizing this changeset. Please wait until they are done to try customizing. Your latest changes have been autosaved.' ),
4110				/* translators: %s: User who is customizing the changeset in customizer. */
4111				'locked_allow_override' => __( '%s is already customizing this changeset. Do you want to take over?' ),
4112			);
4113		} else {
4114			$l10n = array(
4115				/* translators: %s: User who is customizing the changeset in customizer. */
4116				'locked'                => __( '%s is already customizing this site. Please wait until they are done to try customizing. Your latest changes have been autosaved.' ),
4117				/* translators: %s: User who is customizing the changeset in customizer. */
4118				'locked_allow_override' => __( '%s is already customizing this site. Do you want to take over?' ),
4119			);
4120		}
4121
4122		foreach ( $this->registered_control_types as $control_type ) {
4123			$control = new $control_type(
4124				$this,
4125				'temp',
4126				array(
4127					'settings' => array(),
4128				)
4129			);
4130			$control->print_template();
4131		}
4132		?>
4133
4134		<script type="text/html" id="tmpl-customize-control-default-content">
4135			<#
4136			var inputId = _.uniqueId( 'customize-control-default-input-' );
4137			var descriptionId = _.uniqueId( 'customize-control-default-description-' );
4138			var describedByAttr = data.description ? ' aria-describedby="' + descriptionId + '" ' : '';
4139			#>
4140			<# switch ( data.type ) {
4141				case 'checkbox': #>
4142					<span class="customize-inside-control-row">
4143						<input
4144							id="{{ inputId }}"
4145							{{{ describedByAttr }}}
4146							type="checkbox"
4147							value="{{ data.value }}"
4148							data-customize-setting-key-link="default"
4149						>
4150						<label for="{{ inputId }}">
4151							{{ data.label }}
4152						</label>
4153						<# if ( data.description ) { #>
4154							<span id="{{ descriptionId }}" class="description customize-control-description">{{{ data.description }}}</span>
4155						<# } #>
4156					</span>
4157					<#
4158					break;
4159				case 'radio':
4160					if ( ! data.choices ) {
4161						return;
4162					}
4163					#>
4164					<# if ( data.label ) { #>
4165						<label for="{{ inputId }}" class="customize-control-title">
4166							{{ data.label }}
4167						</label>
4168					<# } #>
4169					<# if ( data.description ) { #>
4170						<span id="{{ descriptionId }}" class="description customize-control-description">{{{ data.description }}}</span>
4171					<# } #>
4172					<# _.each( data.choices, function( val, key ) { #>
4173						<span class="customize-inside-control-row">
4174							<#
4175							var value, text;
4176							if ( _.isObject( val ) ) {
4177								value = val.value;
4178								text = val.text;
4179							} else {
4180								value = key;
4181								text = val;
4182							}
4183							#>
4184							<input
4185								id="{{ inputId + '-' + value }}"
4186								type="radio"
4187								value="{{ value }}"
4188								name="{{ inputId }}"
4189								data-customize-setting-key-link="default"
4190								{{{ describedByAttr }}}
4191							>
4192							<label for="{{ inputId + '-' + value }}">{{ text }}</label>
4193						</span>
4194					<# } ); #>
4195					<#
4196					break;
4197				default:
4198					#>
4199					<# if ( data.label ) { #>
4200						<label for="{{ inputId }}" class="customize-control-title">
4201							{{ data.label }}
4202						</label>
4203					<# } #>
4204					<# if ( data.description ) { #>
4205						<span id="{{ descriptionId }}" class="description customize-control-description">{{{ data.description }}}</span>
4206					<# } #>
4207
4208					<#
4209					var inputAttrs = {
4210						id: inputId,
4211						'data-customize-setting-key-link': 'default'
4212					};
4213					if ( 'textarea' === data.type ) {
4214						inputAttrs.rows = '5';
4215					} else if ( 'button' === data.type ) {
4216						inputAttrs['class'] = 'button button-secondary';
4217						inputAttrs.type = 'button';
4218					} else {
4219						inputAttrs.type = data.type;
4220					}
4221					if ( data.description ) {
4222						inputAttrs['aria-describedby'] = descriptionId;
4223					}
4224					_.extend( inputAttrs, data.input_attrs );
4225					#>
4226
4227					<# if ( 'button' === data.type ) { #>
4228						<button
4229							<# _.each( _.extend( inputAttrs ), function( value, key ) { #>
4230								{{{ key }}}="{{ value }}"
4231							<# } ); #>
4232						>{{ inputAttrs.value }}</button>
4233					<# } else if ( 'textarea' === data.type ) { #>
4234						<textarea
4235							<# _.each( _.extend( inputAttrs ), function( value, key ) { #>
4236								{{{ key }}}="{{ value }}"
4237							<# }); #>
4238						>{{ inputAttrs.value }}</textarea>
4239					<# } else if ( 'select' === data.type ) { #>
4240						<# delete inputAttrs.type; #>
4241						<select
4242							<# _.each( _.extend( inputAttrs ), function( value, key ) { #>
4243								{{{ key }}}="{{ value }}"
4244							<# }); #>
4245							>
4246							<# _.each( data.choices, function( val, key ) { #>
4247								<#
4248								var value, text;
4249								if ( _.isObject( val ) ) {
4250									value = val.value;
4251									text = val.text;
4252								} else {
4253									value = key;
4254									text = val;
4255								}
4256								#>
4257								<option value="{{ value }}">{{ text }}</option>
4258							<# } ); #>
4259						</select>
4260					<# } else { #>
4261						<input
4262							<# _.each( _.extend( inputAttrs ), function( value, key ) { #>
4263								{{{ key }}}="{{ value }}"
4264							<# }); #>
4265							>
4266					<# } #>
4267			<# } #>
4268		</script>
4269
4270		<script type="text/html" id="tmpl-customize-notification">
4271			<li class="notice notice-{{ data.type || 'info' }} {{ data.alt ? 'notice-alt' : '' }} {{ data.dismissible ? 'is-dismissible' : '' }} {{ data.containerClasses || '' }}" data-code="{{ data.code }}" data-type="{{ data.type }}">
4272				<div class="notification-message">{{{ data.message || data.code }}}</div>
4273				<# if ( data.dismissible ) { #>
4274					<button type="button" class="notice-dismiss"><span class="screen-reader-text"><?php _e( 'Dismiss' ); ?></span></button>
4275				<# } #>
4276			</li>
4277		</script>
4278
4279		<script type="text/html" id="tmpl-customize-changeset-locked-notification">
4280			<li class="notice notice-{{ data.type || 'info' }} {{ data.containerClasses || '' }}" data-code="{{ data.code }}" data-type="{{ data.type }}">
4281				<div class="notification-message customize-changeset-locked-message">
4282					<img class="customize-changeset-locked-avatar" src="{{ data.lockUser.avatar }}" alt="{{ data.lockUser.name }}" />
4283					<p class="currently-editing">
4284						<# if ( data.message ) { #>
4285							{{{ data.message }}}
4286						<# } else if ( data.allowOverride ) { #>
4287							<?php
4288							echo esc_html( sprintf( $l10n['locked_allow_override'], '{{ data.lockUser.name }}' ) );
4289							?>
4290						<# } else { #>
4291							<?php
4292							echo esc_html( sprintf( $l10n['locked'], '{{ data.lockUser.name }}' ) );
4293							?>
4294						<# } #>
4295					</p>
4296					<p class="notice notice-error notice-alt" hidden></p>
4297					<p class="action-buttons">
4298						<# if ( data.returnUrl !== data.previewUrl ) { #>
4299							<a class="button customize-notice-go-back-button" href="{{ data.returnUrl }}"><?php _e( 'Go back' ); ?></a>
4300						<# } #>
4301						<a class="button customize-notice-preview-button" href="{{ data.frontendPreviewUrl }}"><?php _e( 'Preview' ); ?></a>
4302						<# if ( data.allowOverride ) { #>
4303							<button class="button button-primary wp-tab-last customize-notice-take-over-button"><?php _e( 'Take over' ); ?></button>
4304						<# } #>
4305					</p>
4306				</div>
4307			</li>
4308		</script>
4309
4310		<script type="text/html" id="tmpl-customize-code-editor-lint-error-notification">
4311			<li class="notice notice-{{ data.type || 'info' }} {{ data.alt ? 'notice-alt' : '' }} {{ data.dismissible ? 'is-dismissible' : '' }} {{ data.containerClasses || '' }}" data-code="{{ data.code }}" data-type="{{ data.type }}">
4312				<div class="notification-message">{{{ data.message || data.code }}}</div>
4313
4314				<p>
4315					<# var elementId = 'el-' + String( Math.random() ); #>
4316					<input id="{{ elementId }}" type="checkbox">
4317					<label for="{{ elementId }}"><?php _e( 'Update anyway, even though it might break your site?' ); ?></label>
4318				</p>
4319			</li>
4320		</script>
4321
4322		<?php
4323		/* The following template is obsolete in core but retained for plugins. */
4324		?>
4325		<script type="text/html" id="tmpl-customize-control-notifications">
4326			<ul>
4327				<# _.each( data.notifications, function( notification ) { #>
4328					<li class="notice notice-{{ notification.type || 'info' }} {{ data.altNotice ? 'notice-alt' : '' }}" data-code="{{ notification.code }}" data-type="{{ notification.type }}">{{{ notification.message || notification.code }}}</li>
4329				<# } ); #>
4330			</ul>
4331		</script>
4332
4333		<script type="text/html" id="tmpl-customize-preview-link-control" >
4334			<# var elementPrefix = _.uniqueId( 'el' ) + '-' #>
4335			<p class="customize-control-title">
4336				<?php esc_html_e( 'Share Preview Link' ); ?>
4337			</p>
4338			<p class="description customize-control-description"><?php esc_html_e( 'See how changes would look live on your website, and share the preview with people who can\'t access the Customizer.' ); ?></p>
4339			<div class="customize-control-notifications-container"></div>
4340			<div class="preview-link-wrapper">
4341				<label for="{{ elementPrefix }}customize-preview-link-input" class="screen-reader-text"><?php esc_html_e( 'Preview Link' ); ?></label>
4342				<a href="" target="">
4343					<span class="preview-control-element" data-component="url"></span>
4344					<span class="screen-reader-text"><?php _e( '(opens in a new tab)' ); ?></span>
4345				</a>
4346				<input id="{{ elementPrefix }}customize-preview-link-input" readonly tabindex="-1" class="preview-control-element" data-component="input">
4347				<button class="customize-copy-preview-link preview-control-element button button-secondary" data-component="button" data-copy-text="<?php esc_attr_e( 'Copy' ); ?>" data-copied-text="<?php esc_attr_e( 'Copied' ); ?>" ><?php esc_html_e( 'Copy' ); ?></button>
4348			</div>
4349		</script>
4350		<script type="text/html" id="tmpl-customize-selected-changeset-status-control">
4351			<# var inputId = _.uniqueId( 'customize-selected-changeset-status-control-input-' ); #>
4352			<# var descriptionId = _.uniqueId( 'customize-selected-changeset-status-control-description-' ); #>
4353			<# if ( data.label ) { #>
4354				<label for="{{ inputId }}" class="customize-control-title">{{ data.label }}</label>
4355			<# } #>
4356			<# if ( data.description ) { #>
4357				<span id="{{ descriptionId }}" class="description customize-control-description">{{{ data.description }}}</span>
4358			<# } #>
4359			<# _.each( data.choices, function( choice ) { #>
4360				<# var choiceId = inputId + '-' + choice.status; #>
4361				<span class="customize-inside-control-row">
4362					<input id="{{ choiceId }}" type="radio" value="{{ choice.status }}" name="{{ inputId }}" data-customize-setting-key-link="default">
4363					<label for="{{ choiceId }}">{{ choice.label }}</label>
4364				</span>
4365			<# } ); #>
4366		</script>
4367		<?php
4368	}
4369
4370	/**
4371	 * Helper function to compare two objects by priority, ensuring sort stability via instance_number.
4372	 *
4373	 * @since 3.4.0
4374	 * @deprecated 4.7.0 Use wp_list_sort()
4375	 *
4376	 * @param WP_Customize_Panel|WP_Customize_Section|WP_Customize_Control $a Object A.
4377	 * @param WP_Customize_Panel|WP_Customize_Section|WP_Customize_Control $b Object B.
4378	 * @return int
4379	 */
4380	protected function _cmp_priority( $a, $b ) {
4381		_deprecated_function( __METHOD__, '4.7.0', 'wp_list_sort' );
4382
4383		if ( $a->priority === $b->priority ) {
4384			return $a->instance_number - $b->instance_number;
4385		} else {
4386			return $a->priority - $b->priority;
4387		}
4388	}
4389
4390	/**
4391	 * Prepare panels, sections, and controls.
4392	 *
4393	 * For each, check if required related components exist,
4394	 * whether the user has the necessary capabilities,
4395	 * and sort by priority.
4396	 *
4397	 * @since 3.4.0
4398	 */
4399	public function prepare_controls() {
4400
4401		$controls       = array();
4402		$this->controls = wp_list_sort(
4403			$this->controls,
4404			array(
4405				'priority'        => 'ASC',
4406				'instance_number' => 'ASC',
4407			),
4408			'ASC',
4409			true
4410		);
4411
4412		foreach ( $this->controls as $id => $control ) {
4413			if ( ! isset( $this->sections[ $control->section ] ) || ! $control->check_capabilities() ) {
4414				continue;
4415			}
4416
4417			$this->sections[ $control->section ]->controls[] = $control;
4418			$controls[ $id ]                                 = $control;
4419		}
4420		$this->controls = $controls;
4421
4422		// Prepare sections.
4423		$this->sections = wp_list_sort(
4424			$this->sections,
4425			array(
4426				'priority'        => 'ASC',
4427				'instance_number' => 'ASC',
4428			),
4429			'ASC',
4430			true
4431		);
4432		$sections       = array();
4433
4434		foreach ( $this->sections as $section ) {
4435			if ( ! $section->check_capabilities() ) {
4436				continue;
4437			}
4438
4439			$section->controls = wp_list_sort(
4440				$section->controls,
4441				array(
4442					'priority'        => 'ASC',
4443					'instance_number' => 'ASC',
4444				)
4445			);
4446
4447			if ( ! $section->panel ) {
4448				// Top-level section.
4449				$sections[ $section->id ] = $section;
4450			} else {
4451				// This section belongs to a panel.
4452				if ( isset( $this->panels [ $section->panel ] ) ) {
4453					$this->panels[ $section->panel ]->sections[ $section->id ] = $section;
4454				}
4455			}
4456		}
4457		$this->sections = $sections;
4458
4459		// Prepare panels.
4460		$this->panels = wp_list_sort(
4461			$this->panels,
4462			array(
4463				'priority'        => 'ASC',
4464				'instance_number' => 'ASC',
4465			),
4466			'ASC',
4467			true
4468		);
4469		$panels       = array();
4470
4471		foreach ( $this->panels as $panel ) {
4472			if ( ! $panel->check_capabilities() ) {
4473				continue;
4474			}
4475
4476			$panel->sections      = wp_list_sort(
4477				$panel->sections,
4478				array(
4479					'priority'        => 'ASC',
4480					'instance_number' => 'ASC',
4481				),
4482				'ASC',
4483				true
4484			);
4485			$panels[ $panel->id ] = $panel;
4486		}
4487		$this->panels = $panels;
4488
4489		// Sort panels and top-level sections together.
4490		$this->containers = array_merge( $this->panels, $this->sections );
4491		$this->containers = wp_list_sort(
4492			$this->containers,
4493			array(
4494				'priority'        => 'ASC',
4495				'instance_number' => 'ASC',
4496			),
4497			'ASC',
4498			true
4499		);
4500	}
4501
4502	/**
4503	 * Enqueue scripts for customize controls.
4504	 *
4505	 * @since 3.4.0
4506	 */
4507	public function enqueue_control_scripts() {
4508		foreach ( $this->controls as $control ) {
4509			$control->enqueue();
4510		}
4511
4512		if ( ! is_multisite() && ( current_user_can( 'install_themes' ) || current_user_can( 'update_themes' ) || current_user_can( 'delete_themes' ) ) ) {
4513			wp_enqueue_script( 'updates' );
4514			wp_localize_script(
4515				'updates',
4516				'_wpUpdatesItemCounts',
4517				array(
4518					'totals' => wp_get_update_data(),
4519				)
4520			);
4521		}
4522	}
4523
4524	/**
4525	 * Determine whether the user agent is iOS.
4526	 *
4527	 * @since 4.4.0
4528	 *
4529	 * @return bool Whether the user agent is iOS.
4530	 */
4531	public function is_ios() {
4532		return wp_is_mobile() && preg_match( '/iPad|iPod|iPhone/', $_SERVER['HTTP_USER_AGENT'] );
4533	}
4534
4535	/**
4536	 * Get the template string for the Customizer pane document title.
4537	 *
4538	 * @since 4.4.0
4539	 *
4540	 * @return string The template string for the document title.
4541	 */
4542	public function get_document_title_template() {
4543		if ( $this->is_theme_active() ) {
4544			/* translators: %s: Document title from the preview. */
4545			$document_title_tmpl = __( 'Customize: %s' );
4546		} else {
4547			/* translators: %s: Document title from the preview. */
4548			$document_title_tmpl = __( 'Live Preview: %s' );
4549		}
4550		$document_title_tmpl = html_entity_decode( $document_title_tmpl, ENT_QUOTES, 'UTF-8' ); // Because exported to JS and assigned to document.title.
4551		return $document_title_tmpl;
4552	}
4553
4554	/**
4555	 * Set the initial URL to be previewed.
4556	 *
4557	 * URL is validated.
4558	 *
4559	 * @since 4.4.0
4560	 *
4561	 * @param string $preview_url URL to be previewed.
4562	 */
4563	public function set_preview_url( $preview_url ) {
4564		$preview_url       = esc_url_raw( $preview_url );
4565		$this->preview_url = wp_validate_redirect( $preview_url, home_url( '/' ) );
4566	}
4567
4568	/**
4569	 * Get the initial URL to be previewed.
4570	 *
4571	 * @since 4.4.0
4572	 *
4573	 * @return string URL being previewed.
4574	 */
4575	public function get_preview_url() {
4576		if ( empty( $this->preview_url ) ) {
4577			$preview_url = home_url( '/' );
4578		} else {
4579			$preview_url = $this->preview_url;
4580		}
4581		return $preview_url;
4582	}
4583
4584	/**
4585	 * Determines whether the admin and the frontend are on different domains.
4586	 *
4587	 * @since 4.7.0
4588	 *
4589	 * @return bool Whether cross-domain.
4590	 */
4591	public function is_cross_domain() {
4592		$admin_origin = wp_parse_url( admin_url() );
4593		$home_origin  = wp_parse_url( home_url() );
4594		$cross_domain = ( strtolower( $admin_origin['host'] ) !== strtolower( $home_origin['host'] ) );
4595		return $cross_domain;
4596	}
4597
4598	/**
4599	 * Get URLs allowed to be previewed.
4600	 *
4601	 * If the front end and the admin are served from the same domain, load the
4602	 * preview over ssl if the Customizer is being loaded over ssl. This avoids
4603	 * insecure content warnings. This is not attempted if the admin and front end
4604	 * are on different domains to avoid the case where the front end doesn't have
4605	 * ssl certs. Domain mapping plugins can allow other urls in these conditions
4606	 * using the customize_allowed_urls filter.
4607	 *
4608	 * @since 4.7.0
4609	 *
4610	 * @return array Allowed URLs.
4611	 */
4612	public function get_allowed_urls() {
4613		$allowed_urls = array( home_url( '/' ) );
4614
4615		if ( is_ssl() && ! $this->is_cross_domain() ) {
4616			$allowed_urls[] = home_url( '/', 'https' );
4617		}
4618
4619		/**
4620		 * Filters the list of URLs allowed to be clicked and followed in the Customizer preview.
4621		 *
4622		 * @since 3.4.0
4623		 *
4624		 * @param string[] $allowed_urls An array of allowed URLs.
4625		 */
4626		$allowed_urls = array_unique( apply_filters( 'customize_allowed_urls', $allowed_urls ) );
4627
4628		return $allowed_urls;
4629	}
4630
4631	/**
4632	 * Get messenger channel.
4633	 *
4634	 * @since 4.7.0
4635	 *
4636	 * @return string Messenger channel.
4637	 */
4638	public function get_messenger_channel() {
4639		return $this->messenger_channel;
4640	}
4641
4642	/**
4643	 * Set URL to link the user to when closing the Customizer.
4644	 *
4645	 * URL is validated.
4646	 *
4647	 * @since 4.4.0
4648	 *
4649	 * @param string $return_url URL for return link.
4650	 */
4651	public function set_return_url( $return_url ) {
4652		$return_url       = esc_url_raw( $return_url );
4653		$return_url       = remove_query_arg( wp_removable_query_args(), $return_url );
4654		$return_url       = wp_validate_redirect( $return_url );
4655		$this->return_url = $return_url;
4656	}
4657
4658	/**
4659	 * Get URL to link the user to when closing the Customizer.
4660	 *
4661	 * @since 4.4.0
4662	 *
4663	 * @global array $_registered_pages
4664	 *
4665	 * @return string URL for link to close Customizer.
4666	 */
4667	public function get_return_url() {
4668		global $_registered_pages;
4669
4670		$referer                    = wp_get_referer();
4671		$excluded_referer_basenames = array( 'customize.php', 'wp-login.php' );
4672
4673		if ( $this->return_url ) {
4674			$return_url = $this->return_url;
4675		} elseif ( $referer && ! in_array( wp_basename( parse_url( $referer, PHP_URL_PATH ) ), $excluded_referer_basenames, true ) ) {
4676			$return_url = $referer;
4677		} elseif ( $this->preview_url ) {
4678			$return_url = $this->preview_url;
4679		} else {
4680			$return_url = home_url( '/' );
4681		}
4682
4683		$return_url_basename = wp_basename( parse_url( $this->return_url, PHP_URL_PATH ) );
4684		$return_url_query    = parse_url( $this->return_url, PHP_URL_QUERY );
4685
4686		if ( 'themes.php' === $return_url_basename && $return_url_query ) {
4687			parse_str( $return_url_query, $query_vars );
4688
4689			/*
4690			 * If the return URL is a page added by a theme to the Appearance menu via add_submenu_page(),
4691			 * verify that belongs to the active theme, otherwise fall back to the Themes screen.
4692			 */
4693			if ( isset( $query_vars['page'] ) && ! isset( $_registered_pages[ "appearance_page_{$query_vars['page']}" ] ) ) {
4694				$return_url = admin_url( 'themes.php' );
4695			}
4696		}
4697
4698		return $return_url;
4699	}
4700
4701	/**
4702	 * Set the autofocused constructs.
4703	 *
4704	 * @since 4.4.0
4705	 *
4706	 * @param array $autofocus {
4707	 *     Mapping of 'panel', 'section', 'control' to the ID which should be autofocused.
4708	 *
4709	 *     @type string $control ID for control to be autofocused.
4710	 *     @type string $section ID for section to be autofocused.
4711	 *     @type string $panel   ID for panel to be autofocused.
4712	 * }
4713	 */
4714	public function set_autofocus( $autofocus ) {
4715		$this->autofocus = array_filter( wp_array_slice_assoc( $autofocus, array( 'panel', 'section', 'control' ) ), 'is_string' );
4716	}
4717
4718	/**
4719	 * Get the autofocused constructs.
4720	 *
4721	 * @since 4.4.0
4722	 *
4723	 * @return array {
4724	 *     Mapping of 'panel', 'section', 'control' to the ID which should be autofocused.
4725	 *
4726	 *     @type string $control ID for control to be autofocused.
4727	 *     @type string $section ID for section to be autofocused.
4728	 *     @type string $panel   ID for panel to be autofocused.
4729	 * }
4730	 */
4731	public function get_autofocus() {
4732		return $this->autofocus;
4733	}
4734
4735	/**
4736	 * Get nonces for the Customizer.
4737	 *
4738	 * @since 4.5.0
4739	 *
4740	 * @return array Nonces.
4741	 */
4742	public function get_nonces() {
4743		$nonces = array(
4744			'save'                     => wp_create_nonce( 'save-customize_' . $this->get_stylesheet() ),
4745			'preview'                  => wp_create_nonce( 'preview-customize_' . $this->get_stylesheet() ),
4746			'switch_themes'            => wp_create_nonce( 'switch_themes' ),
4747			'dismiss_autosave_or_lock' => wp_create_nonce( 'customize_dismiss_autosave_or_lock' ),
4748			'override_lock'            => wp_create_nonce( 'customize_override_changeset_lock' ),
4749			'trash'                    => wp_create_nonce( 'trash_customize_changeset' ),
4750		);
4751
4752		/**
4753		 * Filters nonces for Customizer.
4754		 *
4755		 * @since 4.2.0
4756		 *
4757		 * @param string[]             $nonces Array of refreshed nonces for save and
4758		 *                                     preview actions.
4759		 * @param WP_Customize_Manager $this   WP_Customize_Manager instance.
4760		 */
4761		$nonces = apply_filters( 'customize_refresh_nonces', $nonces, $this );
4762
4763		return $nonces;
4764	}
4765
4766	/**
4767	 * Print JavaScript settings for parent window.
4768	 *
4769	 * @since 4.4.0
4770	 */
4771	public function customize_pane_settings() {
4772
4773		$login_url = add_query_arg(
4774			array(
4775				'interim-login'   => 1,
4776				'customize-login' => 1,
4777			),
4778			wp_login_url()
4779		);
4780
4781		// Ensure dirty flags are set for modified settings.
4782		foreach ( array_keys( $this->unsanitized_post_values() ) as $setting_id ) {
4783			$setting = $this->get_setting( $setting_id );
4784			if ( $setting ) {
4785				$setting->dirty = true;
4786			}
4787		}
4788
4789		$autosave_revision_post  = null;
4790		$autosave_autodraft_post = null;
4791		$changeset_post_id       = $this->changeset_post_id();
4792		if ( ! $this->saved_starter_content_changeset && ! $this->autosaved() ) {
4793			if ( $changeset_post_id ) {
4794				if ( is_user_logged_in() ) {
4795					$autosave_revision_post = wp_get_post_autosave( $changeset_post_id, get_current_user_id() );
4796				}
4797			} else {
4798				$autosave_autodraft_posts = $this->get_changeset_posts(
4799					array(
4800						'posts_per_page'            => 1,
4801						'post_status'               => 'auto-draft',
4802						'exclude_restore_dismissed' => true,
4803					)
4804				);
4805				if ( ! empty( $autosave_autodraft_posts ) ) {
4806					$autosave_autodraft_post = array_shift( $autosave_autodraft_posts );
4807				}
4808			}
4809		}
4810
4811		$current_user_can_publish = current_user_can( get_post_type_object( 'customize_changeset' )->cap->publish_posts );
4812
4813		// @todo Include all of the status labels here from script-loader.php, and then allow it to be filtered.
4814		$status_choices = array();
4815		if ( $current_user_can_publish ) {
4816			$status_choices[] = array(
4817				'status' => 'publish',
4818				'label'  => __( 'Publish' ),
4819			);
4820		}
4821		$status_choices[] = array(
4822			'status' => 'draft',
4823			'label'  => __( 'Save Draft' ),
4824		);
4825		if ( $current_user_can_publish ) {
4826			$status_choices[] = array(
4827				'status' => 'future',
4828				'label'  => _x( 'Schedule', 'customizer changeset action/button label' ),
4829			);
4830		}
4831
4832		// Prepare Customizer settings to pass to JavaScript.
4833		$changeset_post = null;
4834		if ( $changeset_post_id ) {
4835			$changeset_post = get_post( $changeset_post_id );
4836		}
4837
4838		// Determine initial date to be at present or future, not past.
4839		$current_time = current_time( 'mysql', false );
4840		$initial_date = $current_time;
4841		if ( $changeset_post ) {
4842			$initial_date = get_the_time( 'Y-m-d H:i:s', $changeset_post->ID );
4843			if ( $initial_date < $current_time ) {
4844				$initial_date = $current_time;
4845			}
4846		}
4847
4848		$lock_user_id = false;
4849		if ( $this->changeset_post_id() ) {
4850			$lock_user_id = wp_check_post_lock( $this->changeset_post_id() );
4851		}
4852
4853		$settings = array(
4854			'changeset'              => array(
4855				'uuid'                  => $this->changeset_uuid(),
4856				'branching'             => $this->branching(),
4857				'autosaved'             => $this->autosaved(),
4858				'hasAutosaveRevision'   => ! empty( $autosave_revision_post ),
4859				'latestAutoDraftUuid'   => $autosave_autodraft_post ? $autosave_autodraft_post->post_name : null,
4860				'status'                => $changeset_post ? $changeset_post->post_status : '',
4861				'currentUserCanPublish' => $current_user_can_publish,
4862				'publishDate'           => $initial_date,
4863				'statusChoices'         => $status_choices,
4864				'lockUser'              => $lock_user_id ? $this->get_lock_user_data( $lock_user_id ) : null,
4865			),
4866			'initialServerDate'      => $current_time,
4867			'dateFormat'             => get_option( 'date_format' ),
4868			'timeFormat'             => get_option( 'time_format' ),
4869			'initialServerTimestamp' => floor( microtime( true ) * 1000 ),
4870			'initialClientTimestamp' => -1, // To be set with JS below.
4871			'timeouts'               => array(
4872				'windowRefresh'           => 250,
4873				'changesetAutoSave'       => AUTOSAVE_INTERVAL * 1000,
4874				'keepAliveCheck'          => 2500,
4875				'reflowPaneContents'      => 100,
4876				'previewFrameSensitivity' => 2000,
4877			),
4878			'theme'                  => array(
4879				'stylesheet'  => $this->get_stylesheet(),
4880				'active'      => $this->is_theme_active(),
4881				'_canInstall' => current_user_can( 'install_themes' ),
4882			),
4883			'url'                    => array(
4884				'preview'       => esc_url_raw( $this->get_preview_url() ),
4885				'return'        => esc_url_raw( $this->get_return_url() ),
4886				'parent'        => esc_url_raw( admin_url() ),
4887				'activated'     => esc_url_raw( home_url( '/' ) ),
4888				'ajax'          => esc_url_raw( admin_url( 'admin-ajax.php', 'relative' ) ),
4889				'allowed'       => array_map( 'esc_url_raw', $this->get_allowed_urls() ),
4890				'isCrossDomain' => $this->is_cross_domain(),
4891				'home'          => esc_url_raw( home_url( '/' ) ),
4892				'login'         => esc_url_raw( $login_url ),
4893			),
4894			'browser'                => array(
4895				'mobile' => wp_is_mobile(),
4896				'ios'    => $this->is_ios(),
4897			),
4898			'panels'                 => array(),
4899			'sections'               => array(),
4900			'nonce'                  => $this->get_nonces(),
4901			'autofocus'              => $this->get_autofocus(),
4902			'documentTitleTmpl'      => $this->get_document_title_template(),
4903			'previewableDevices'     => $this->get_previewable_devices(),
4904			'l10n'                   => array(
4905				'confirmDeleteTheme'   => __( 'Are you sure you want to delete this theme?' ),
4906				/* translators: %d: Number of theme search results, which cannot currently consider singular vs. plural forms. */
4907				'themeSearchResults'   => __( '%d themes found' ),
4908				/* translators: %d: Number of themes being displayed, which cannot currently consider singular vs. plural forms. */
4909				'announceThemeCount'   => __( 'Displaying %d themes' ),
4910				/* translators: %s: Theme name. */
4911				'announceThemeDetails' => __( 'Showing details for theme: %s' ),
4912			),
4913		);
4914
4915		// Temporarily disable installation in Customizer. See #42184.
4916		$filesystem_method = get_filesystem_method();
4917		ob_start();
4918		$filesystem_credentials_are_stored = request_filesystem_credentials( self_admin_url() );
4919		ob_end_clean();
4920		if ( 'direct' !== $filesystem_method && ! $filesystem_credentials_are_stored ) {
4921			$settings['theme']['_filesystemCredentialsNeeded'] = true;
4922		}
4923
4924		// Prepare Customize Section objects to pass to JavaScript.
4925		foreach ( $this->sections() as $id => $section ) {
4926			if ( $section->check_capabilities() ) {
4927				$settings['sections'][ $id ] = $section->json();
4928			}
4929		}
4930
4931		// Prepare Customize Panel objects to pass to JavaScript.
4932		foreach ( $this->panels() as $panel_id => $panel ) {
4933			if ( $panel->check_capabilities() ) {
4934				$settings['panels'][ $panel_id ] = $panel->json();
4935				foreach ( $panel->sections as $section_id => $section ) {
4936					if ( $section->check_capabilities() ) {
4937						$settings['sections'][ $section_id ] = $section->json();
4938					}
4939				}
4940			}
4941		}
4942
4943		?>
4944		<script type="text/javascript">
4945			var _wpCustomizeSettings = <?php echo wp_json_encode( $settings ); ?>;
4946			_wpCustomizeSettings.initialClientTimestamp = _.now();
4947			_wpCustomizeSettings.controls = {};
4948			_wpCustomizeSettings.settings = {};
4949			<?php
4950
4951			// Serialize settings one by one to improve memory usage.
4952			echo "(function ( s ){\n";
4953			foreach ( $this->settings() as $setting ) {
4954				if ( $setting->check_capabilities() ) {
4955					printf(
4956						"s[%s] = %s;\n",
4957						wp_json_encode( $setting->id ),
4958						wp_json_encode( $setting->json() )
4959					);
4960				}
4961			}
4962			echo "})( _wpCustomizeSettings.settings );\n";
4963
4964			// Serialize controls one by one to improve memory usage.
4965			echo "(function ( c ){\n";
4966			foreach ( $this->controls() as $control ) {
4967				if ( $control->check_capabilities() ) {
4968					printf(
4969						"c[%s] = %s;\n",
4970						wp_json_encode( $control->id ),
4971						wp_json_encode( $control->json() )
4972					);
4973				}
4974			}
4975			echo "})( _wpCustomizeSettings.controls );\n";
4976			?>
4977		</script>
4978		<?php
4979	}
4980
4981	/**
4982	 * Returns a list of devices to allow previewing.
4983	 *
4984	 * @since 4.5.0
4985	 *
4986	 * @return array List of devices with labels and default setting.
4987	 */
4988	public function get_previewable_devices() {
4989		$devices = array(
4990			'desktop' => array(
4991				'label'   => __( 'Enter desktop preview mode' ),
4992				'default' => true,
4993			),
4994			'tablet'  => array(
4995				'label' => __( 'Enter tablet preview mode' ),
4996			),
4997			'mobile'  => array(
4998				'label' => __( 'Enter mobile preview mode' ),
4999			),
5000		);
5001
5002		/**
5003		 * Filters the available devices to allow previewing in the Customizer.
5004		 *
5005		 * @since 4.5.0
5006		 *
5007		 * @see WP_Customize_Manager::get_previewable_devices()
5008		 *
5009		 * @param array $devices List of devices with labels and default setting.
5010		 */
5011		$devices = apply_filters( 'customize_previewable_devices', $devices );
5012
5013		return $devices;
5014	}
5015
5016	/**
5017	 * Register some default controls.
5018	 *
5019	 * @since 3.4.0
5020	 */
5021	public function register_controls() {
5022
5023		/* Themes (controls are loaded via ajax) */
5024
5025		$this->add_panel(
5026			new WP_Customize_Themes_Panel(
5027				$this,
5028				'themes',
5029				array(
5030					'title'       => $this->theme()->display( 'Name' ),
5031					'description' => (
5032					'<p>' . __( 'Looking for a theme? You can search or browse the WordPress.org theme directory, install and preview themes, then activate them right here.' ) . '</p>' .
5033					'<p>' . __( 'While previewing a new theme, you can continue to tailor things like widgets and menus, and explore theme-specific options.' ) . '</p>'
5034					),
5035					'capability'  => 'switch_themes',
5036					'priority'    => 0,
5037				)
5038			)
5039		);
5040
5041		$this->add_section(
5042			new WP_Customize_Themes_Section(
5043				$this,
5044				'installed_themes',
5045				array(
5046					'title'      => __( 'Installed themes' ),
5047					'action'     => 'installed',
5048					'capability' => 'switch_themes',
5049					'panel'      => 'themes',
5050					'priority'   => 0,
5051				)
5052			)
5053		);
5054
5055		if ( ! is_multisite() ) {
5056			$this->add_section(
5057				new WP_Customize_Themes_Section(
5058					$this,
5059					'wporg_themes',
5060					array(
5061						'title'       => __( 'WordPress.org themes' ),
5062						'action'      => 'wporg',
5063						'filter_type' => 'remote',
5064						'capability'  => 'install_themes',
5065						'panel'       => 'themes',
5066						'priority'    => 5,
5067					)
5068				)
5069			);
5070		}
5071
5072		// Themes Setting (unused - the theme is considerably more fundamental to the Customizer experience).
5073		$this->add_setting(
5074			new WP_Customize_Filter_Setting(
5075				$this,
5076				'active_theme',
5077				array(
5078					'capability' => 'switch_themes',
5079				)
5080			)
5081		);
5082
5083		/* Site Identity */
5084
5085		$this->add_section(
5086			'title_tagline',
5087			array(
5088				'title'    => __( 'Site Identity' ),
5089				'priority' => 20,
5090			)
5091		);
5092
5093		$this->add_setting(
5094			'blogname',
5095			array(
5096				'default'    => get_option( 'blogname' ),
5097				'type'       => 'option',
5098				'capability' => 'manage_options',
5099			)
5100		);
5101
5102		$this->add_control(
5103			'blogname',
5104			array(
5105				'label'   => __( 'Site Title' ),
5106				'section' => 'title_tagline',
5107			)
5108		);
5109
5110		$this->add_setting(
5111			'blogdescription',
5112			array(
5113				'default'    => get_option( 'blogdescription' ),
5114				'type'       => 'option',
5115				'capability' => 'manage_options',
5116			)
5117		);
5118
5119		$this->add_control(
5120			'blogdescription',
5121			array(
5122				'label'   => __( 'Tagline' ),
5123				'section' => 'title_tagline',
5124			)
5125		);
5126
5127		// Add a setting to hide header text if the theme doesn't support custom headers.
5128		if ( ! current_theme_supports( 'custom-header', 'header-text' ) ) {
5129			$this->add_setting(
5130				'header_text',
5131				array(
5132					'theme_supports'    => array( 'custom-logo', 'header-text' ),
5133					'default'           => 1,
5134					'sanitize_callback' => 'absint',
5135				)
5136			);
5137
5138			$this->add_control(
5139				'header_text',
5140				array(
5141					'label'    => __( 'Display Site Title and Tagline' ),
5142					'section'  => 'title_tagline',
5143					'settings' => 'header_text',
5144					'type'     => 'checkbox',
5145				)
5146			);
5147		}
5148
5149		$this->add_setting(
5150			'site_icon',
5151			array(
5152				'type'       => 'option',
5153				'capability' => 'manage_options',
5154				'transport'  => 'postMessage', // Previewed with JS in the Customizer controls window.
5155			)
5156		);
5157
5158		$this->add_control(
5159			new WP_Customize_Site_Icon_Control(
5160				$this,
5161				'site_icon',
5162				array(
5163					'label'       => __( 'Site Icon' ),
5164					'description' => sprintf(
5165						'<p>' . __( 'Site Icons are what you see in browser tabs, bookmark bars, and within the WordPress mobile apps. Upload one here!' ) . '</p>' .
5166						/* translators: %s: Site icon size in pixels. */
5167						'<p>' . __( 'Site Icons should be square and at least %s pixels.' ) . '</p>',
5168						'<strong>512 &times; 512</strong>'
5169					),
5170					'section'     => 'title_tagline',
5171					'priority'    => 60,
5172					'height'      => 512,
5173					'width'       => 512,
5174				)
5175			)
5176		);
5177
5178		$this->add_setting(
5179			'custom_logo',
5180			array(
5181				'theme_supports' => array( 'custom-logo' ),
5182				'transport'      => 'postMessage',
5183			)
5184		);
5185
5186		$custom_logo_args = get_theme_support( 'custom-logo' );
5187		$this->add_control(
5188			new WP_Customize_Cropped_Image_Control(
5189				$this,
5190				'custom_logo',
5191				array(
5192					'label'         => __( 'Logo' ),
5193					'section'       => 'title_tagline',
5194					'priority'      => 8,
5195					'height'        => isset( $custom_logo_args[0]['height'] ) ? $custom_logo_args[0]['height'] : null,
5196					'width'         => isset( $custom_logo_args[0]['width'] ) ? $custom_logo_args[0]['width'] : null,
5197					'flex_height'   => isset( $custom_logo_args[0]['flex-height'] ) ? $custom_logo_args[0]['flex-height'] : null,
5198					'flex_width'    => isset( $custom_logo_args[0]['flex-width'] ) ? $custom_logo_args[0]['flex-width'] : null,
5199					'button_labels' => array(
5200						'select'       => __( 'Select logo' ),
5201						'change'       => __( 'Change logo' ),
5202						'remove'       => __( 'Remove' ),
5203						'default'      => __( 'Default' ),
5204						'placeholder'  => __( 'No logo selected' ),
5205						'frame_title'  => __( 'Select logo' ),
5206						'frame_button' => __( 'Choose logo' ),
5207					),
5208				)
5209			)
5210		);
5211
5212		$this->selective_refresh->add_partial(
5213			'custom_logo',
5214			array(
5215				'settings'            => array( 'custom_logo' ),
5216				'selector'            => '.custom-logo-link',
5217				'render_callback'     => array( $this, '_render_custom_logo_partial' ),
5218				'container_inclusive' => true,
5219			)
5220		);
5221
5222		/* Colors */
5223
5224		$this->add_section(
5225			'colors',
5226			array(
5227				'title'    => __( 'Colors' ),
5228				'priority' => 40,
5229			)
5230		);
5231
5232		$this->add_setting(
5233			'header_textcolor',
5234			array(
5235				'theme_supports'       => array( 'custom-header', 'header-text' ),
5236				'default'              => get_theme_support( 'custom-header', 'default-text-color' ),
5237
5238				'sanitize_callback'    => array( $this, '_sanitize_header_textcolor' ),
5239				'sanitize_js_callback' => 'maybe_hash_hex_color',
5240			)
5241		);
5242
5243		// Input type: checkbox.
5244		// With custom value.
5245		$this->add_control(
5246			'display_header_text',
5247			array(
5248				'settings' => 'header_textcolor',
5249				'label'    => __( 'Display Site Title and Tagline' ),
5250				'section'  => 'title_tagline',
5251				'type'     => 'checkbox',
5252				'priority' => 40,
5253			)
5254		);
5255
5256		$this->add_control(
5257			new WP_Customize_Color_Control(
5258				$this,
5259				'header_textcolor',
5260				array(
5261					'label'   => __( 'Header Text Color' ),
5262					'section' => 'colors',
5263				)
5264			)
5265		);
5266
5267		// Input type: color.
5268		// With sanitize_callback.
5269		$this->add_setting(
5270			'background_color',
5271			array(
5272				'default'              => get_theme_support( 'custom-background', 'default-color' ),
5273				'theme_supports'       => 'custom-background',
5274
5275				'sanitize_callback'    => 'sanitize_hex_color_no_hash',
5276				'sanitize_js_callback' => 'maybe_hash_hex_color',
5277			)
5278		);
5279
5280		$this->add_control(
5281			new WP_Customize_Color_Control(
5282				$this,
5283				'background_color',
5284				array(
5285					'label'   => __( 'Background Color' ),
5286					'section' => 'colors',
5287				)
5288			)
5289		);
5290
5291		/* Custom Header */
5292
5293		if ( current_theme_supports( 'custom-header', 'video' ) ) {
5294			$title       = __( 'Header Media' );
5295			$description = '<p>' . __( 'If you add a video, the image will be used as a fallback while the video loads.' ) . '</p>';
5296
5297			$width  = absint( get_theme_support( 'custom-header', 'width' ) );
5298			$height = absint( get_theme_support( 'custom-header', 'height' ) );
5299			if ( $width && $height ) {
5300				$control_description = sprintf(
5301					/* translators: 1: .mp4, 2: Header size in pixels. */
5302					__( 'Upload your video in %1$s format and minimize its file size for best results. Your theme recommends dimensions of %2$s pixels.' ),
5303					'<code>.mp4</code>',
5304					sprintf( '<strong>%s &times; %s</strong>', $width, $height )
5305				);
5306			} elseif ( $width ) {
5307				$control_description = sprintf(
5308					/* translators: 1: .mp4, 2: Header width in pixels. */
5309					__( 'Upload your video in %1$s format and minimize its file size for best results. Your theme recommends a width of %2$s pixels.' ),
5310					'<code>.mp4</code>',
5311					sprintf( '<strong>%s</strong>', $width )
5312				);
5313			} else {
5314				$control_description = sprintf(
5315					/* translators: 1: .mp4, 2: Header height in pixels. */
5316					__( 'Upload your video in %1$s format and minimize its file size for best results. Your theme recommends a height of %2$s pixels.' ),
5317					'<code>.mp4</code>',
5318					sprintf( '<strong>%s</strong>', $height )
5319				);
5320			}
5321		} else {
5322			$title               = __( 'Header Image' );
5323			$description         = '';
5324			$control_description = '';
5325		}
5326
5327		$this->add_section(
5328			'header_image',
5329			array(
5330				'title'          => $title,
5331				'description'    => $description,
5332				'theme_supports' => 'custom-header',
5333				'priority'       => 60,
5334			)
5335		);
5336
5337		$this->add_setting(
5338			'header_video',
5339			array(
5340				'theme_supports'    => array( 'custom-header', 'video' ),
5341				'transport'         => 'postMessage',
5342				'sanitize_callback' => 'absint',
5343				'validate_callback' => array( $this, '_validate_header_video' ),
5344			)
5345		);
5346
5347		$this->add_setting(
5348			'external_header_video',
5349			array(
5350				'theme_supports'    => array( 'custom-header', 'video' ),
5351				'transport'         => 'postMessage',
5352				'sanitize_callback' => array( $this, '_sanitize_external_header_video' ),
5353				'validate_callback' => array( $this, '_validate_external_header_video' ),
5354			)
5355		);
5356
5357		$this->add_setting(
5358			new WP_Customize_Filter_Setting(
5359				$this,
5360				'header_image',
5361				array(
5362					'default'        => sprintf( get_theme_support( 'custom-header', 'default-image' ), get_template_directory_uri(), get_stylesheet_directory_uri() ),
5363					'theme_supports' => 'custom-header',
5364				)
5365			)
5366		);
5367
5368		$this->add_setting(
5369			new WP_Customize_Header_Image_Setting(
5370				$this,
5371				'header_image_data',
5372				array(
5373					'theme_supports' => 'custom-header',
5374				)
5375			)
5376		);
5377
5378		/*
5379		 * Switch image settings to postMessage when video support is enabled since
5380		 * it entails that the_custom_header_markup() will be used, and thus selective
5381		 * refresh can be utilized.
5382		 */
5383		if ( current_theme_supports( 'custom-header', 'video' ) ) {
5384			$this->get_setting( 'header_image' )->transport      = 'postMessage';
5385			$this->get_setting( 'header_image_data' )->transport = 'postMessage';
5386		}
5387
5388		$this->add_control(
5389			new WP_Customize_Media_Control(
5390				$this,
5391				'header_video',
5392				array(
5393					'theme_supports'  => array( 'custom-header', 'video' ),
5394					'label'           => __( 'Header Video' ),
5395					'description'     => $control_description,
5396					'section'         => 'header_image',
5397					'mime_type'       => 'video',
5398					'active_callback' => 'is_header_video_active',
5399				)
5400			)
5401		);
5402
5403		$this->add_control(
5404			'external_header_video',
5405			array(
5406				'theme_supports'  => array( 'custom-header', 'video' ),
5407				'type'            => 'url',
5408				'description'     => __( 'Or, enter a YouTube URL:' ),
5409				'section'         => 'header_image',
5410				'active_callback' => 'is_header_video_active',
5411			)
5412		);
5413
5414		$this->add_control( new WP_Customize_Header_Image_Control( $this ) );
5415
5416		$this->selective_refresh->add_partial(
5417			'custom_header',
5418			array(
5419				'selector'            => '#wp-custom-header',
5420				'render_callback'     => 'the_custom_header_markup',
5421				'settings'            => array( 'header_video', 'external_header_video', 'header_image' ), // The image is used as a video fallback here.
5422				'container_inclusive' => true,
5423			)
5424		);
5425
5426		/* Custom Background */
5427
5428		$this->add_section(
5429			'background_image',
5430			array(
5431				'title'          => __( 'Background Image' ),
5432				'theme_supports' => 'custom-background',
5433				'priority'       => 80,
5434			)
5435		);
5436
5437		$this->add_setting(
5438			'background_image',
5439			array(
5440				'default'           => get_theme_support( 'custom-background', 'default-image' ),
5441				'theme_supports'    => 'custom-background',
5442				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
5443			)
5444		);
5445
5446		$this->add_setting(
5447			new WP_Customize_Background_Image_Setting(
5448				$this,
5449				'background_image_thumb',
5450				array(
5451					'theme_supports'    => 'custom-background',
5452					'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
5453				)
5454			)
5455		);
5456
5457		$this->add_control( new WP_Customize_Background_Image_Control( $this ) );
5458
5459		$this->add_setting(
5460			'background_preset',
5461			array(
5462				'default'           => get_theme_support( 'custom-background', 'default-preset' ),
5463				'theme_supports'    => 'custom-background',
5464				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
5465			)
5466		);
5467
5468		$this->add_control(
5469			'background_preset',
5470			array(
5471				'label'   => _x( 'Preset', 'Background Preset' ),
5472				'section' => 'background_image',
5473				'type'    => 'select',
5474				'choices' => array(
5475					'default' => _x( 'Default', 'Default Preset' ),
5476					'fill'    => __( 'Fill Screen' ),
5477					'fit'     => __( 'Fit to Screen' ),
5478					'repeat'  => _x( 'Repeat', 'Repeat Image' ),
5479					'custom'  => _x( 'Custom', 'Custom Preset' ),
5480				),
5481			)
5482		);
5483
5484		$this->add_setting(
5485			'background_position_x',
5486			array(
5487				'default'           => get_theme_support( 'custom-background', 'default-position-x' ),
5488				'theme_supports'    => 'custom-background',
5489				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
5490			)
5491		);
5492
5493		$this->add_setting(
5494			'background_position_y',
5495			array(
5496				'default'           => get_theme_support( 'custom-background', 'default-position-y' ),
5497				'theme_supports'    => 'custom-background',
5498				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
5499			)
5500		);
5501
5502		$this->add_control(
5503			new WP_Customize_Background_Position_Control(
5504				$this,
5505				'background_position',
5506				array(
5507					'label'    => __( 'Image Position' ),
5508					'section'  => 'background_image',
5509					'settings' => array(
5510						'x' => 'background_position_x',
5511						'y' => 'background_position_y',
5512					),
5513				)
5514			)
5515		);
5516
5517		$this->add_setting(
5518			'background_size',
5519			array(
5520				'default'           => get_theme_support( 'custom-background', 'default-size' ),
5521				'theme_supports'    => 'custom-background',
5522				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
5523			)
5524		);
5525
5526		$this->add_control(
5527			'background_size',
5528			array(
5529				'label'   => __( 'Image Size' ),
5530				'section' => 'background_image',
5531				'type'    => 'select',
5532				'choices' => array(
5533					'auto'    => _x( 'Original', 'Original Size' ),
5534					'contain' => __( 'Fit to Screen' ),
5535					'cover'   => __( 'Fill Screen' ),
5536				),
5537			)
5538		);
5539
5540		$this->add_setting(
5541			'background_repeat',
5542			array(
5543				'default'           => get_theme_support( 'custom-background', 'default-repeat' ),
5544				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
5545				'theme_supports'    => 'custom-background',
5546			)
5547		);
5548
5549		$this->add_control(
5550			'background_repeat',
5551			array(
5552				'label'   => __( 'Repeat Background Image' ),
5553				'section' => 'background_image',
5554				'type'    => 'checkbox',
5555			)
5556		);
5557
5558		$this->add_setting(
5559			'background_attachment',
5560			array(
5561				'default'           => get_theme_support( 'custom-background', 'default-attachment' ),
5562				'sanitize_callback' => array( $this, '_sanitize_background_setting' ),
5563				'theme_supports'    => 'custom-background',
5564			)
5565		);
5566
5567		$this->add_control(
5568			'background_attachment',
5569			array(
5570				'label'   => __( 'Scroll with Page' ),
5571				'section' => 'background_image',
5572				'type'    => 'checkbox',
5573			)
5574		);
5575
5576		// If the theme is using the default background callback, we can update
5577		// the background CSS using postMessage.
5578		if ( get_theme_support( 'custom-background', 'wp-head-callback' ) === '_custom_background_cb' ) {
5579			foreach ( array( 'color', 'image', 'preset', 'position_x', 'position_y', 'size', 'repeat', 'attachment' ) as $prop ) {
5580				$this->get_setting( 'background_' . $prop )->transport = 'postMessage';
5581			}
5582		}
5583
5584		/*
5585		 * Static Front Page
5586		 * See also https://core.trac.wordpress.org/ticket/19627 which introduces the static-front-page theme_support.
5587		 * The following replicates behavior from options-reading.php.
5588		 */
5589
5590		$this->add_section(
5591			'static_front_page',
5592			array(
5593				'title'           => __( 'Homepage Settings' ),
5594				'priority'        => 120,
5595				'description'     => __( 'You can choose what&#8217;s displayed on the homepage of your site. It can be posts in reverse chronological order (classic blog), or a fixed/static page. To set a static homepage, you first need to create two Pages. One will become the homepage, and the other will be where your posts are displayed.' ),
5596				'active_callback' => array( $this, 'has_published_pages' ),
5597			)
5598		);
5599
5600		$this->add_setting(
5601			'show_on_front',
5602			array(
5603				'default'    => get_option( 'show_on_front' ),
5604				'capability' => 'manage_options',
5605				'type'       => 'option',
5606			)
5607		);
5608
5609		$this->add_control(
5610			'show_on_front',
5611			array(
5612				'label'   => __( 'Your homepage displays' ),
5613				'section' => 'static_front_page',
5614				'type'    => 'radio',
5615				'choices' => array(
5616					'posts' => __( 'Your latest posts' ),
5617					'page'  => __( 'A static page' ),
5618				),
5619			)
5620		);
5621
5622		$this->add_setting(
5623			'page_on_front',
5624			array(
5625				'type'       => 'option',
5626				'capability' => 'manage_options',
5627			)
5628		);
5629
5630		$this->add_control(
5631			'page_on_front',
5632			array(
5633				'label'          => __( 'Homepage' ),
5634				'section'        => 'static_front_page',
5635				'type'           => 'dropdown-pages',
5636				'allow_addition' => true,
5637			)
5638		);
5639
5640		$this->add_setting(
5641			'page_for_posts',
5642			array(
5643				'type'       => 'option',
5644				'capability' => 'manage_options',
5645			)
5646		);
5647
5648		$this->add_control(
5649			'page_for_posts',
5650			array(
5651				'label'          => __( 'Posts page' ),
5652				'section'        => 'static_front_page',
5653				'type'           => 'dropdown-pages',
5654				'allow_addition' => true,
5655			)
5656		);
5657
5658		/* Custom CSS */
5659		$section_description  = '<p>';
5660		$section_description .= __( 'Add your own CSS code here to customize the appearance and layout of your site.' );
5661		$section_description .= sprintf(
5662			' <a href="%1$s" class="external-link" target="_blank">%2$s<span class="screen-reader-text"> %3$s</span></a>',
5663			esc_url( __( 'https://codex.wordpress.org/CSS' ) ),
5664			__( 'Learn more about CSS' ),
5665			/* translators: Accessibility text. */
5666			__( '(opens in a new tab)' )
5667		);
5668		$section_description .= '</p>';
5669
5670		$section_description .= '<p id="editor-keyboard-trap-help-1">' . __( 'When using a keyboard to navigate:' ) . '</p>';
5671		$section_description .= '<ul>';
5672		$section_description .= '<li id="editor-keyboard-trap-help-2">' . __( 'In the editing area, the Tab key enters a tab character.' ) . '</li>';
5673		$section_description .= '<li id="editor-keyboard-trap-help-3">' . __( 'To move away from this area, press the Esc key followed by the Tab key.' ) . '</li>';
5674		$section_description .= '<li id="editor-keyboard-trap-help-4">' . __( 'Screen reader users: when in forms mode, you may need to press the Esc key twice.' ) . '</li>';
5675		$section_description .= '</ul>';
5676
5677		if ( 'false' !== wp_get_current_user()->syntax_highlighting ) {
5678			$section_description .= '<p>';
5679			$section_description .= sprintf(
5680				/* translators: 1: Link to user profile, 2: Additional link attributes, 3: Accessibility text. */
5681				__( 'The edit field automatically highlights code syntax. You can disable this in your <a href="%1$s" %2$s>user profile%3$s</a> to work in plain text mode.' ),
5682				esc_url( get_edit_profile_url() ),
5683				'class="external-link" target="_blank"',
5684				sprintf(
5685					'<span class="screen-reader-text"> %s</span>',
5686					/* translators: Accessibility text. */
5687					__( '(opens in a new tab)' )
5688				)
5689			);
5690			$section_description .= '</p>';
5691		}
5692
5693		$section_description .= '<p class="section-description-buttons">';
5694		$section_description .= '<button type="button" class="button-link section-description-close">' . __( 'Close' ) . '</button>';
5695		$section_description .= '</p>';
5696
5697		$this->add_section(
5698			'custom_css',
5699			array(
5700				'title'              => __( 'Additional CSS' ),
5701				'priority'           => 200,
5702				'description_hidden' => true,
5703				'description'        => $section_description,
5704			)
5705		);
5706
5707		$custom_css_setting = new WP_Customize_Custom_CSS_Setting(
5708			$this,
5709			sprintf( 'custom_css[%s]', get_stylesheet() ),
5710			array(
5711				'capability' => 'edit_css',
5712				'default'    => '',
5713			)
5714		);
5715		$this->add_setting( $custom_css_setting );
5716
5717		$this->add_control(
5718			new WP_Customize_Code_Editor_Control(
5719				$this,
5720				'custom_css',
5721				array(
5722					'label'       => __( 'CSS code' ),
5723					'section'     => 'custom_css',
5724					'settings'    => array( 'default' => $custom_css_setting->id ),
5725					'code_type'   => 'text/css',
5726					'input_attrs' => array(
5727						'aria-describedby' => 'editor-keyboard-trap-help-1 editor-keyboard-trap-help-2 editor-keyboard-trap-help-3 editor-keyboard-trap-help-4',
5728					),
5729				)
5730			)
5731		);
5732	}
5733
5734	/**
5735	 * Return whether there are published pages.
5736	 *
5737	 * Used as active callback for static front page section and controls.
5738	 *
5739	 * @since 4.7.0
5740	 *
5741	 * @return bool Whether there are published (or to be published) pages.
5742	 */
5743	public function has_published_pages() {
5744
5745		$setting = $this->get_setting( 'nav_menus_created_posts' );
5746		if ( $setting ) {
5747			foreach ( $setting->value() as $post_id ) {
5748				if ( 'page' === get_post_type( $post_id ) ) {
5749					return true;
5750				}
5751			}
5752		}
5753		return 0 !== count( get_pages() );
5754	}
5755
5756	/**
5757	 * Add settings from the POST data that were not added with code, e.g. dynamically-created settings for Widgets
5758	 *
5759	 * @since 4.2.0
5760	 *
5761	 * @see add_dynamic_settings()
5762	 */
5763	public function register_dynamic_settings() {
5764		$setting_ids = array_keys( $this->unsanitized_post_values() );
5765		$this->add_dynamic_settings( $setting_ids );
5766	}
5767
5768	/**
5769	 * Load themes into the theme browsing/installation UI.
5770	 *
5771	 * @since 4.9.0
5772	 */
5773	public function handle_load_themes_request() {
5774		check_ajax_referer( 'switch_themes', 'nonce' );
5775
5776		if ( ! current_user_can( 'switch_themes' ) ) {
5777			wp_die( -1 );
5778		}
5779
5780		if ( empty( $_POST['theme_action'] ) ) {
5781			wp_send_json_error( 'missing_theme_action' );
5782		}
5783		$theme_action = sanitize_key( $_POST['theme_action'] );
5784		$themes       = array();
5785		$args         = array();
5786
5787		// Define query filters based on user input.
5788		if ( ! array_key_exists( 'search', $_POST ) ) {
5789			$args['search'] = '';
5790		} else {
5791			$args['search'] = sanitize_text_field( wp_unslash( $_POST['search'] ) );
5792		}
5793
5794		if ( ! array_key_exists( 'tags', $_POST ) ) {
5795			$args['tag'] = '';
5796		} else {
5797			$args['tag'] = array_map( 'sanitize_text_field', wp_unslash( (array) $_POST['tags'] ) );
5798		}
5799
5800		if ( ! array_key_exists( 'page', $_POST ) ) {
5801			$args['page'] = 1;
5802		} else {
5803			$args['page'] = absint( $_POST['page'] );
5804		}
5805
5806		require_once ABSPATH . 'wp-admin/includes/theme.php';
5807
5808		if ( 'installed' === $theme_action ) {
5809
5810			// Load all installed themes from wp_prepare_themes_for_js().
5811			$themes = array( 'themes' => wp_prepare_themes_for_js() );
5812			foreach ( $themes['themes'] as &$theme ) {
5813				$theme['type']   = 'installed';
5814				$theme['active'] = ( isset( $_POST['customized_theme'] ) && $_POST['customized_theme'] === $theme['id'] );
5815			}
5816		} elseif ( 'wporg' === $theme_action ) {
5817
5818			// Load WordPress.org themes from the .org API and normalize data to match installed theme objects.
5819			if ( ! current_user_can( 'install_themes' ) ) {
5820				wp_die( -1 );
5821			}
5822
5823			// Arguments for all queries.
5824			$wporg_args = array(
5825				'per_page' => 100,
5826				'fields'   => array(
5827					'reviews_url' => true, // Explicitly request the reviews URL to be linked from the customizer.
5828				),
5829			);
5830
5831			$args = array_merge( $wporg_args, $args );
5832
5833			if ( '' === $args['search'] && '' === $args['tag'] ) {
5834				$args['browse'] = 'new'; // Sort by latest themes by default.
5835			}
5836
5837			// Load themes from the .org API.
5838			$themes = themes_api( 'query_themes', $args );
5839			if ( is_wp_error( $themes ) ) {
5840				wp_send_json_error();
5841			}
5842
5843			// This list matches the allowed tags in wp-admin/includes/theme-install.php.
5844			$themes_allowedtags                     = array_fill_keys(
5845				array( 'a', 'abbr', 'acronym', 'code', 'pre', 'em', 'strong', 'div', 'p', 'ul', 'ol', 'li', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'img' ),
5846				array()
5847			);
5848			$themes_allowedtags['a']                = array_fill_keys( array( 'href', 'title', 'target' ), true );
5849			$themes_allowedtags['acronym']['title'] = true;
5850			$themes_allowedtags['abbr']['title']    = true;
5851			$themes_allowedtags['img']              = array_fill_keys( array( 'src', 'class', 'alt' ), true );
5852
5853			// Prepare a list of installed themes to check against before the loop.
5854			$installed_themes = array();
5855			$wp_themes        = wp_get_themes();
5856			foreach ( $wp_themes as $theme ) {
5857				$installed_themes[] = $theme->get_stylesheet();
5858			}
5859			$update_php = network_admin_url( 'update.php?action=install-theme' );
5860
5861			// Set up properties for themes available on WordPress.org.
5862			foreach ( $themes->themes as &$theme ) {
5863				$theme->install_url = add_query_arg(
5864					array(
5865						'theme'    => $theme->slug,
5866						'_wpnonce' => wp_create_nonce( 'install-theme_' . $theme->slug ),
5867					),
5868					$update_php
5869				);
5870
5871				$theme->name        = wp_kses( $theme->name, $themes_allowedtags );
5872				$theme->version     = wp_kses( $theme->version, $themes_allowedtags );
5873				$theme->description = wp_kses( $theme->description, $themes_allowedtags );
5874				$theme->stars       = wp_star_rating(
5875					array(
5876						'rating' => $theme->rating,
5877						'type'   => 'percent',
5878						'number' => $theme->num_ratings,
5879						'echo'   => false,
5880					)
5881				);
5882				$theme->num_ratings = number_format_i18n( $theme->num_ratings );
5883				$theme->preview_url = set_url_scheme( $theme->preview_url );
5884
5885				// Handle themes that are already installed as installed themes.
5886				if ( in_array( $theme->slug, $installed_themes, true ) ) {
5887					$theme->type = 'installed';
5888				} else {
5889					$theme->type = $theme_action;
5890				}
5891
5892				// Set active based on customized theme.
5893				$theme->active = ( isset( $_POST['customized_theme'] ) && $_POST['customized_theme'] === $theme->slug );
5894
5895				// Map available theme properties to installed theme properties.
5896				$theme->id            = $theme->slug;
5897				$theme->screenshot    = array( $theme->screenshot_url );
5898				$theme->authorAndUri  = wp_kses( $theme->author['display_name'], $themes_allowedtags );
5899				$theme->compatibleWP  = is_wp_version_compatible( $theme->requires ); // phpcs:ignore WordPress.NamingConventions.ValidVariableName
5900				$theme->compatiblePHP = is_php_version_compatible( $theme->requires_php ); // phpcs:ignore WordPress.NamingConventions.ValidVariableName
5901
5902				if ( isset( $theme->parent ) ) {
5903					$theme->parent = $theme->parent['slug'];
5904				} else {
5905					$theme->parent = false;
5906				}
5907				unset( $theme->slug );
5908				unset( $theme->screenshot_url );
5909				unset( $theme->author );
5910			} // End foreach().
5911		} // End if().
5912
5913		/**
5914		 * Filters the theme data loaded in the customizer.
5915		 *
5916		 * This allows theme data to be loading from an external source,
5917		 * or modification of data loaded from `wp_prepare_themes_for_js()`
5918		 * or WordPress.org via `themes_api()`.
5919		 *
5920		 * @since 4.9.0
5921		 *
5922		 * @see wp_prepare_themes_for_js()
5923		 * @see themes_api()
5924		 * @see WP_Customize_Manager::__construct()
5925		 *
5926		 * @param array                $themes  Nested array of theme data.
5927		 * @param array                $args    List of arguments, such as page, search term, and tags to query for.
5928		 * @param WP_Customize_Manager $manager Instance of Customize manager.
5929		 */
5930		$themes = apply_filters( 'customize_load_themes', $themes, $args, $this );
5931
5932		wp_send_json_success( $themes );
5933	}
5934
5935
5936	/**
5937	 * Callback for validating the header_textcolor value.
5938	 *
5939	 * Accepts 'blank', and otherwise uses sanitize_hex_color_no_hash().
5940	 * Returns default text color if hex color is empty.
5941	 *
5942	 * @since 3.4.0
5943	 *
5944	 * @param string $color
5945	 * @return mixed
5946	 */
5947	public function _sanitize_header_textcolor( $color ) {
5948		if ( 'blank' === $color ) {
5949			return 'blank';
5950		}
5951
5952		$color = sanitize_hex_color_no_hash( $color );
5953		if ( empty( $color ) ) {
5954			$color = get_theme_support( 'custom-header', 'default-text-color' );
5955		}
5956
5957		return $color;
5958	}
5959
5960	/**
5961	 * Callback for validating a background setting value.
5962	 *
5963	 * @since 4.7.0
5964	 *
5965	 * @param string               $value   Repeat value.
5966	 * @param WP_Customize_Setting $setting Setting.
5967	 * @return string|WP_Error Background value or validation error.
5968	 */
5969	public function _sanitize_background_setting( $value, $setting ) {
5970		if ( 'background_repeat' === $setting->id ) {
5971			if ( ! in_array( $value, array( 'repeat-x', 'repeat-y', 'repeat', 'no-repeat' ), true ) ) {
5972				return new WP_Error( 'invalid_value', __( 'Invalid value for background repeat.' ) );
5973			}
5974		} elseif ( 'background_attachment' === $setting->id ) {
5975			if ( ! in_array( $value, array( 'fixed', 'scroll' ), true ) ) {
5976				return new WP_Error( 'invalid_value', __( 'Invalid value for background attachment.' ) );
5977			}
5978		} elseif ( 'background_position_x' === $setting->id ) {
5979			if ( ! in_array( $value, array( 'left', 'center', 'right' ), true ) ) {
5980				return new WP_Error( 'invalid_value', __( 'Invalid value for background position X.' ) );
5981			}
5982		} elseif ( 'background_position_y' === $setting->id ) {
5983			if ( ! in_array( $value, array( 'top', 'center', 'bottom' ), true ) ) {
5984				return new WP_Error( 'invalid_value', __( 'Invalid value for background position Y.' ) );
5985			}
5986		} elseif ( 'background_size' === $setting->id ) {
5987			if ( ! in_array( $value, array( 'auto', 'contain', 'cover' ), true ) ) {
5988				return new WP_Error( 'invalid_value', __( 'Invalid value for background size.' ) );
5989			}
5990		} elseif ( 'background_preset' === $setting->id ) {
5991			if ( ! in_array( $value, array( 'default', 'fill', 'fit', 'repeat', 'custom' ), true ) ) {
5992				return new WP_Error( 'invalid_value', __( 'Invalid value for background size.' ) );
5993			}
5994		} elseif ( 'background_image' === $setting->id || 'background_image_thumb' === $setting->id ) {
5995			$value = empty( $value ) ? '' : esc_url_raw( $value );
5996		} else {
5997			return new WP_Error( 'unrecognized_setting', __( 'Unrecognized background setting.' ) );
5998		}
5999		return $value;
6000	}
6001
6002	/**
6003	 * Export header video settings to facilitate selective refresh.
6004	 *
6005	 * @since 4.7.0
6006	 *
6007	 * @param array                          $response          Response.
6008	 * @param WP_Customize_Selective_Refresh $selective_refresh Selective refresh component.
6009	 * @param array                          $partials          Array of partials.
6010	 * @return array
6011	 */
6012	public function export_header_video_settings( $response, $selective_refresh, $partials ) {
6013		if ( isset( $partials['custom_header'] ) ) {
6014			$response['custom_header_settings'] = get_header_video_settings();
6015		}
6016
6017		return $response;
6018	}
6019
6020	/**
6021	 * Callback for validating the header_video value.
6022	 *
6023	 * Ensures that the selected video is less than 8MB and provides an error message.
6024	 *
6025	 * @since 4.7.0
6026	 *
6027	 * @param WP_Error $validity
6028	 * @param mixed    $value
6029	 * @return mixed
6030	 */
6031	public function _validate_header_video( $validity, $value ) {
6032		$video = get_attached_file( absint( $value ) );
6033		if ( $video ) {
6034			$size = filesize( $video );
6035			if ( $size > 8 * MB_IN_BYTES ) {
6036				$validity->add(
6037					'size_too_large',
6038					__( 'This video file is too large to use as a header video. Try a shorter video or optimize the compression settings and re-upload a file that is less than 8MB. Or, upload your video to YouTube and link it with the option below.' )
6039				);
6040			}
6041			if ( '.mp4' !== substr( $video, -4 ) && '.mov' !== substr( $video, -4 ) ) { // Check for .mp4 or .mov format, which (assuming h.264 encoding) are the only cross-browser-supported formats.
6042				$validity->add(
6043					'invalid_file_type',
6044					sprintf(
6045						/* translators: 1: .mp4, 2: .mov */
6046						__( 'Only %1$s or %2$s files may be used for header video. Please convert your video file and try again, or, upload your video to YouTube and link it with the option below.' ),
6047						'<code>.mp4</code>',
6048						'<code>.mov</code>'
6049					)
6050				);
6051			}
6052		}
6053		return $validity;
6054	}
6055
6056	/**
6057	 * Callback for validating the external_header_video value.
6058	 *
6059	 * Ensures that the provided URL is supported.
6060	 *
6061	 * @since 4.7.0
6062	 *
6063	 * @param WP_Error $validity
6064	 * @param mixed    $value
6065	 * @return mixed
6066	 */
6067	public function _validate_external_header_video( $validity, $value ) {
6068		$video = esc_url_raw( $value );
6069		if ( $video ) {
6070			if ( ! preg_match( '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#', $video ) ) {
6071				$validity->add( 'invalid_url', __( 'Please enter a valid YouTube URL.' ) );
6072			}
6073		}
6074		return $validity;
6075	}
6076
6077	/**
6078	 * Callback for sanitizing the external_header_video value.
6079	 *
6080	 * @since 4.7.1
6081	 *
6082	 * @param string $value URL.
6083	 * @return string Sanitized URL.
6084	 */
6085	public function _sanitize_external_header_video( $value ) {
6086		return esc_url_raw( trim( $value ) );
6087	}
6088
6089	/**
6090	 * Callback for rendering the custom logo, used in the custom_logo partial.
6091	 *
6092	 * This method exists because the partial object and context data are passed
6093	 * into a partial's render_callback so we cannot use get_custom_logo() as
6094	 * the render_callback directly since it expects a blog ID as the first
6095	 * argument. When WP no longer supports PHP 5.3, this method can be removed
6096	 * in favor of an anonymous function.
6097	 *
6098	 * @see WP_Customize_Manager::register_controls()
6099	 *
6100	 * @since 4.5.0
6101	 *
6102	 * @return string Custom logo.
6103	 */
6104	public function _render_custom_logo_partial() {
6105		return get_custom_logo();
6106	}
6107}
6108