infinity.php — Jetpack – WP Security, Backup, Speed, & Growth 15.8.1

jetpack / modules / infinite-scroll / infinity.php

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themes 9 months ago infinity-customizer.js 1 year ago infinity.css 3 months ago infinity.js 3 months ago infinity.php 5 months ago

infinity.php

2171 lines

1	<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
2
3	// phpcs:disable Universal.Files.SeparateFunctionsFromOO.Mixed -- TODO: Move classes to appropriately-named class files.
4
5	use Automattic\Jetpack\Assets;
6
7	if ( ! defined( 'ABSPATH' ) ) {
8	exit( 0 );
9	}
10
11	/*
12	Plugin Name: The Neverending Home Page.
13	Plugin URI: https://automattic.com/
14	Description: Adds infinite scrolling support to the front-end blog post view for themes, pulling the next set of posts automatically into view when the reader approaches the bottom of the page.
15	Version: 1.1
16	Author: Automattic
17	Author URI: https://automattic.com/
18	License: GNU General Public License v2 or later
19	License URI: https://www.gnu.org/licenses/gpl-2.0.html
20	Text Domain: jetpack
21	*/
22
23	/**
24	* Class: The_Neverending_Home_Page relies on add_theme_support, expects specific
25	* styling from each theme; including fixed footer.
26	*
27	* @phan-constructor-used-for-side-effects
28	*/
29	class The_Neverending_Home_Page {
30	/**
31	* Maximum allowed number of posts per page in $_REQUEST.
32	*/
33	const MAX_ALLOWED_POSTS_PER_PAGE_ΙΝ_REQUEST = 5000;
34
35	/**
36	* Register actions and filters, plus parse IS settings
37	*
38	* @uses add_action, add_filter, self::get_settings
39	*/
40	public function __construct() {
41	add_action( 'pre_get_posts', array( $this, 'posts_per_page_query' ) );
42	add_action( 'admin_init', array( $this, 'settings_api_init' ) );
43	add_action( 'template_redirect', array( $this, 'action_template_redirect' ) );
44	add_action( 'customize_preview_init', array( $this, 'init_customizer_assets' ) );
45	add_action( 'template_redirect', array( $this, 'ajax_response' ) );
46	add_action( 'custom_ajax_infinite_scroll', array( $this, 'query' ) );
47	add_filter( 'infinite_scroll_query_args', array( $this, 'inject_query_args' ) );
48	add_filter( 'infinite_scroll_allowed_vars', array( $this, 'allowed_query_vars' ) );
49	add_action( 'the_post', array( $this, 'preserve_more_tag' ) );
50	add_action( 'wp_footer', array( $this, 'footer' ) );
51	add_filter( 'infinite_scroll_additional_scripts', array( $this, 'add_mejs_config' ) );
52
53	// Plugin compatibility
54	add_filter( 'grunion_contact_form_redirect_url', array( $this, 'filter_grunion_redirect_url' ) );
55
56	// AMP compatibility
57	// needs to happen after parse_query so that Jetpack_AMP_Support::is_amp_request() is ready.
58	add_action( 'wp', array( $this, 'amp_load_hooks' ) );
59
60	// Parse IS settings from theme
61	self::get_settings();
62	}
63
64	/**
65	* Initialize our static variables
66	*/
67
68	/**
69	* The time.
70	*
71	* @var null - I don't think this is used?
72	*/
73	public static $the_time = null;
74
75	/**
76	* Settings.
77	*
78	* Don't access directly, instead use self::get_settings().
79	*
80	* @var array
81	*/
82	public static $settings = null;
83
84	/**
85	* The enabled option name.
86	*
87	* @var string
88	*/
89	public static $option_name_enabled = 'infinite_scroll';
90
91	/**
92	* Parse IS settings provided by theme
93	*
94	* @uses get_theme_support, infinite_scroll_has_footer_widgets, sanitize_title, add_action, get_option, wp_parse_args, is_active_sidebar
95	* @return object
96	*/
97	public static function get_settings() {
98	$defaults = array(
99	'type' => 'scroll', // scroll \| click
100	'requested_type' => 'scroll', // store the original type for use when logic overrides it
101	'footer_widgets' => false, // true \| false \| sidebar_id \| array of sidebar_ids -- last two are checked with is_active_sidebar
102	'container' => 'content', // container html id
103	'wrapper' => true, // true \| false \| html class -- the html class.
104	'render' => false, // optional function, otherwise the `content` template part will be used
105	'footer' => true, // boolean to enable or disable the infinite footer \| string to provide an html id to derive footer width from
106	'footer_callback' => false, // function to be called to render the IS footer, in place of the default
107	'posts_per_page' => false, // phpcs:ignore WordPress.WP.PostsPerPage.posts_per_page_posts_per_page -- int \| false to set based on IS type
108	'click_handle' => true, // boolean to enable or disable rendering the click handler div. If type is click and this is false, page must include its own trigger with the HTML ID `infinite-handle`.
109	);
110
111	if ( self::$settings === null ) {
112	$css_pattern = '#[^A-Z\d\-_]#i';
113
114	$settings = $defaults;
115	// Validate settings passed through add_theme_support()
116	$_settings = get_theme_support( 'infinite-scroll' );
117
118	if ( is_array( $_settings ) ) {
119	// Preferred implementation, where theme provides an array of options
120	if ( isset( $_settings[0] ) && is_array( $_settings[0] ) ) {
121	foreach ( $_settings[0] as $key => $value ) {
122	switch ( $key ) {
123	case 'type':
124	if ( in_array( $value, array( 'scroll', 'click' ), true ) ) {
125	$settings['requested_type'] = $value;
126	$settings[ $key ] = $settings['requested_type'];
127	}
128
129	break;
130
131	case 'footer_widgets':
132	if ( is_string( $value ) ) {
133	$settings[ $key ] = sanitize_title( $value );
134	} elseif ( is_array( $value ) ) {
135	$settings[ $key ] = array_map( 'sanitize_title', $value );
136	} elseif ( is_bool( $value ) ) {
137	$settings[ $key ] = $value;
138	}
139
140	break;
141
142	case 'container':
143	case 'wrapper':
144	if ( 'wrapper' === $key && is_bool( $value ) ) {
145	$settings[ $key ] = $value;
146	} else {
147	$value = preg_replace( $css_pattern, '', $value );
148
149	if ( ! empty( $value ) ) {
150	$settings[ $key ] = $value;
151	}
152	}
153
154	break;
155
156	case 'render':
157	if ( false !== $value && is_callable( $value ) ) {
158	$settings[ $key ] = $value;
159	}
160
161	break;
162
163	case 'footer':
164	if ( is_bool( $value ) ) {
165	$settings[ $key ] = $value;
166	} elseif ( is_string( $value ) ) {
167	$value = preg_replace( $css_pattern, '', $value );
168
169	if ( ! empty( $value ) ) {
170	$settings[ $key ] = $value;
171	}
172	}
173
174	break;
175
176	case 'footer_callback':
177	if ( is_callable( $value ) ) {
178	$settings[ $key ] = $value;
179	} else {
180	$settings[ $key ] = false;
181	}
182
183	break;
184
185	case 'posts_per_page':
186	if ( is_numeric( $value ) ) {
187	$settings[ $key ] = (int) $value;
188	}
189
190	break;
191
192	case 'click_handle':
193	if ( is_bool( $value ) ) {
194	$settings[ $key ] = $value;
195	}
196
197	break;
198
199	default:
200	break;
201	}
202	}
203	} elseif ( is_string( $_settings[0] ) ) {
204	// Checks below are for backwards compatibility
205
206	// Container to append new posts to
207	$settings['container'] = preg_replace( $css_pattern, '', $_settings[0] );
208
209	// Wrap IS elements?
210	if ( isset( $_settings[1] ) ) {
211	$settings['wrapper'] = (bool) $_settings[1];
212	}
213	}
214	}
215
216	// Always ensure all values are present in the final array
217	$settings = wp_parse_args( $settings, $defaults );
218
219	// Check if a legacy `infinite_scroll_has_footer_widgets()` function is defined and override the footer_widgets parameter's value.
220	// Otherwise, if a widget area ID or array of IDs was provided in the footer_widgets parameter, check if any contains any widgets.
221	// It is safe to use `is_active_sidebar()` before the sidebar is registered as this function doesn't check for a sidebar's existence when determining if it contains any widgets.
222	if ( function_exists( 'infinite_scroll_has_footer_widgets' ) ) {
223	// @phan-suppress-next-line PhanUndeclaredFunction -- Checked above. See also https://github.com/phan/phan/issues/1204.
224	$settings['footer_widgets'] = (bool) infinite_scroll_has_footer_widgets();
225	} elseif ( is_array( $settings['footer_widgets'] ) ) {
226	$sidebar_ids = $settings['footer_widgets'];
227	$settings['footer_widgets'] = false;
228
229	foreach ( $sidebar_ids as $sidebar_id ) {
230	if ( is_active_sidebar( $sidebar_id ) ) {
231	$settings['footer_widgets'] = true;
232	break;
233	}
234	}
235
236	unset( $sidebar_ids );
237	unset( $sidebar_id );
238	} elseif ( is_string( $settings['footer_widgets'] ) ) {
239	$settings['footer_widgets'] = (bool) is_active_sidebar( $settings['footer_widgets'] );
240	}
241
242	/**
243	* Filter Infinite Scroll's `footer_widgets` parameter.
244	*
245	* @module infinite-scroll
246	*
247	* @since 2.0.0
248	*
249	* @param bool $settings['footer_widgets'] Does the current theme have Footer Widgets.
250	*/
251	$settings['footer_widgets'] = apply_filters( 'infinite_scroll_has_footer_widgets', $settings['footer_widgets'] );
252
253	// Finally, after all of the sidebar checks and filtering, ensure that a boolean value is present, otherwise set to default of `false`.
254	if ( ! is_bool( $settings['footer_widgets'] ) ) {
255	$settings['footer_widgets'] = false;
256	}
257
258	// Ensure that IS is enabled and no footer widgets exist if the IS type isn't already "click".
259	if ( 'click' !== $settings['type'] ) {
260	// Check the setting status
261	$disabled = '' === get_option( self::$option_name_enabled ) ? true : false;
262
263	// Footer content or Reading option check
264	if ( $settings['footer_widgets'] \|\| $disabled ) {
265	$settings['type'] = 'click';
266	}
267	}
268
269	// Force display of the click handler and attendant bits when the type isn't `click`
270	if ( 'click' !== $settings['type'] ) {
271	$settings['click_handle'] = true;
272	}
273
274	// Store final settings in a class static to avoid reparsing
275	self::$settings = $settings;
276	}
277
278	/**
279	* Filter the array of Infinite Scroll settings.
280	*
281	* @module infinite-scroll
282	*
283	* @since 2.0.0
284	*
285	* @param array $settings Array of Infinite Scroll settings.
286	*/
287	$filtered_settings = apply_filters( 'infinite_scroll_settings', self::$settings );
288
289	// Ensure all properties are still set.
290	return (object) wp_parse_args( $filtered_settings, $defaults );
291	}
292
293	/**
294	* Number of posts per page.
295	*
296	* @uses self::wp_query, self::get_settings, apply_filters
297	* @return int
298	*/
299	public static function posts_per_page() {
300	$settings = self::get_settings();
301	$posts_per_page = $settings->posts_per_page ? $settings->posts_per_page : self::wp_query()->get( 'posts_per_page' );
302	$posts_per_page_core_option = get_option( 'posts_per_page' );
303
304	// If Infinite Scroll is set to click, and if the site owner changed posts_per_page, let's use that.
305	if (
306	'click' === $settings->type
307	&& ( '10' !== $posts_per_page_core_option )
308	) {
309	$posts_per_page = $posts_per_page_core_option;
310	}
311
312	// Take JS query into consideration here.
313	$posts_per_page_in_request = isset( $_REQUEST['query_args']['posts_per_page'] ) ? (int) $_REQUEST['query_args']['posts_per_page'] : 0; // phpcs:ignore WordPress.Security.NonceVerification.Recommended
314	if ( $posts_per_page_in_request > 0 &&
315	self::MAX_ALLOWED_POSTS_PER_PAGE_ΙΝ_REQUEST >= $posts_per_page_in_request
316	) {
317	$posts_per_page = $posts_per_page_in_request;
318	}
319
320	/**
321	* Filter the number of posts per page.
322	*
323	* @module infinite-scroll
324	*
325	* @since 6.0.0
326	*
327	* @param int $posts_per_page The number of posts to display per page.
328	*/
329	return (int) apply_filters( 'infinite_scroll_posts_per_page', $posts_per_page );
330	}
331
332	/**
333	* Retrieve the query used with Infinite Scroll
334	*
335	* @global $wp_the_query
336	* @uses apply_filters
337	* @return object
338	*/
339	public static function wp_query() {
340	global $wp_the_query;
341	/**
342	* Filter the Infinite Scroll query object.
343	*
344	* @module infinite-scroll
345	*
346	* @since 2.2.1
347	*
348	* @param WP_Query $wp_the_query WP Query.
349	*/
350	return apply_filters( 'infinite_scroll_query_object', $wp_the_query );
351	}
352
353	/**
354	* Has infinite scroll been triggered?
355	*/
356	public static function got_infinity() {
357	/**
358	* Filter the parameter used to check if Infinite Scroll has been triggered.
359	*
360	* @module infinite-scroll
361	*
362	* @since 3.9.0
363	*
364	* @param bool isset( $_GET[ 'infinity' ] ) Return true if the "infinity" parameter is set.
365	*/
366	return apply_filters( 'infinite_scroll_got_infinity', isset( $_GET['infinity'] ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no changes made to the site.
367	}
368
369	/**
370	* Is this guaranteed to be the last batch of posts?
371	*/
372	public static function is_last_batch() {
373	/**
374	* Override whether or not this is the last batch for a request
375	*
376	* @module infinite-scroll
377	*
378	* @since 4.8.0
379	*
380	* @param bool\|null null Bool if value should be overridden, null to determine from query
381	* @param object self::wp_query() WP_Query object for current request
382	* @param object self::get_settings() Infinite Scroll settings
383	*/
384	$override = apply_filters( 'infinite_scroll_is_last_batch', null, self::wp_query(), self::get_settings() ); // phpcs:ignore WordPress.WP.ClassNameCase.Incorrect -- False positive.
385	if ( is_bool( $override ) ) {
386	return $override;
387	}
388
389	$entries = (int) self::wp_query()->found_posts;
390	$posts_per_page = self::posts_per_page();
391
392	// This is to cope with an issue in certain themes or setups where posts are returned but found_posts is 0.
393	if ( 0 === $entries ) {
394	return ( ! is_countable( self::wp_query()->posts ) \|\| ( count( self::wp_query()->posts ) < $posts_per_page ) );
395	}
396	$paged = max( 1, (int) self::wp_query()->get( 'paged' ) );
397
398	// Are there enough posts for more than the first page?
399	if ( $entries <= $posts_per_page ) {
400	return true;
401	}
402
403	// Calculate entries left after a certain number of pages
404	if ( $paged && $paged > 1 ) {
405	$entries -= $posts_per_page * $paged;
406	}
407
408	// Are there some entries left to display?
409	return $entries <= 0;
410	}
411
412	/**
413	* The more tag will be ignored by default if the blog page isn't our homepage.
414	* Let's force the $more global to false.
415	*
416	* @param array $array - the_post array.
417	* @return array
418	*/
419	public function preserve_more_tag( $array ) {
420	global $more;
421
422	if ( self::got_infinity() ) {
423	$more = 0; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- 0 = show content up to the more tag. Add more link.
424	}
425
426	return $array;
427	}
428
429	/**
430	* Add a checkbox field to Settings > Reading
431	* for enabling infinite scroll.
432	*
433	* Only show if the current theme supports infinity.
434	*
435	* @uses current_theme_supports, add_settings_field, __, register_setting
436	* @action admin_init
437	* @return null
438	*/
439	public function settings_api_init() {
440	if ( ! current_theme_supports( 'infinite-scroll' ) ) {
441	return;
442	}
443
444	// Add the setting field [infinite_scroll] and place it in Settings > Reading
445	add_settings_field( self::$option_name_enabled, '<span id="infinite-scroll-options">' . esc_html__( 'Infinite Scroll Behavior', 'jetpack' ) . '</span>', array( $this, 'infinite_setting_html' ), 'reading' );
446	register_setting( 'reading', self::$option_name_enabled, 'esc_attr' );
447	}
448
449	/**
450	* HTML code to display a checkbox true/false option
451	* for the infinite_scroll setting.
452	*/
453	public function infinite_setting_html() {
454	$settings = self::get_settings();
455
456	// If the blog has footer widgets, show a notice instead of the checkbox
457	if ( $settings->footer_widgets \|\| 'click' === $settings->requested_type ) {
458	echo '<label><em>' . esc_html__( 'We’ve changed this option to a click-to-scroll version for you since you have footer widgets in Appearance → Widgets, or your theme uses click-to-scroll as the default behavior.', 'jetpack' ) . '</em></label>';
459	} else {
460	echo '<label><input name="infinite_scroll" type="checkbox" value="1" ' . checked( 1, '' !== get_option( self::$option_name_enabled ), false ) . ' /> ' . esc_html__( 'Check to load posts as you scroll. Uncheck to show clickable button to load posts', 'jetpack' ) . '</label>';
461	// translators: the number of posts to show on each page load.
462	echo '<p class="description">' . esc_html( sprintf( _n( 'Shows %s post on each load.', 'Shows %s posts on each load.', self::posts_per_page(), 'jetpack' ), number_format_i18n( self::posts_per_page() ) ) ) . '</p>';
463	}
464	}
465
466	/**
467	* Does the legwork to determine whether the feature is enabled.
468	*
469	* @uses current_theme_supports, self::archive_supports_infinity, self::get_settings, add_filter, wp_enqueue_script, plugins_url, wp_enqueue_style, add_action
470	* @action template_redirect
471	* @return null
472	*/
473	public function action_template_redirect() {
474	// Check that we support infinite scroll, and are on the home page.
475	if ( ! current_theme_supports( 'infinite-scroll' ) \|\| ! self::archive_supports_infinity() ) {
476	return;
477	}
478
479	$id = self::get_settings()->container;
480
481	// Check that we have an id.
482	if ( empty( $id ) ) {
483	return;
484	}
485
486	// AMP infinite scroll functionality will start on amp_load_hooks().
487	if ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() ) {
488	return;
489	}
490
491	// Add our scripts.
492	wp_register_script(
493	'the-neverending-homepage',
494	Assets::get_file_url_for_environment(
495	'_inc/build/infinite-scroll/infinity.min.js',
496	'modules/infinite-scroll/infinity.js'
497	),
498	array(),
499	JETPACK__VERSION . '-is5.0.1', // Added for ability to cachebust on WP.com.
500	true
501	);
502
503	// Add our default styles.
504	wp_register_style( 'the-neverending-homepage', plugins_url( 'infinity.css', __FILE__ ), array(), '20140422' );
505
506	// Make sure there are enough posts for IS
507	if ( self::is_last_batch() ) {
508	return;
509	}
510
511	// Add our scripts.
512	wp_enqueue_script( 'the-neverending-homepage' );
513
514	// Add our default styles.
515	wp_enqueue_style( 'the-neverending-homepage' );
516
517	add_action( 'wp_footer', array( $this, 'action_wp_footer_settings' ), 2 );
518
519	add_action( 'wp_footer', array( $this, 'action_wp_footer' ), 21 ); // Core prints footer scripts at priority 20, so we just need to be one later than that
520
521	add_filter( 'infinite_scroll_results', array( $this, 'filter_infinite_scroll_results' ), 10, 3 );
522	}
523
524	/**
525	* Initialize the Customizer logic separately from the main JS.
526	*
527	* @since 8.4.0
528	*/
529	public function init_customizer_assets() {
530	// Add our scripts.
531	wp_register_script(
532	'the-neverending-homepage-customizer',
533	Assets::get_file_url_for_environment(
534	'_inc/build/infinite-scroll/infinity-customizer.min.js',
535	'modules/infinite-scroll/infinity-customizer.js'
536	),
537	array( 'jquery', 'customize-base' ),
538	JETPACK__VERSION . '-is5.0.0', // Added for ability to cachebust on WP.com.
539	true
540	);
541
542	wp_enqueue_script( 'the-neverending-homepage-customizer' );
543	}
544
545	/**
546	* Returns classes to be added to <body>. If it's enabled, 'infinite-scroll'. If set to continuous scroll, adds 'neverending' too.
547	*
548	* @since 4.7.0 No longer added as a 'body_class' filter but passed to JS environment and added using JS.
549	*
550	* @return string
551	*/
552	public function body_class() {
553	$settings = self::get_settings();
554	$classes = '';
555	// Do not add infinity-scroll class if disabled through the Reading page
556	$disabled = '' === get_option( self::$option_name_enabled ) ? true : false;
557	if ( ! $disabled \|\| 'click' === $settings->type ) {
558	$classes = 'infinite-scroll';
559
560	if ( 'scroll' === $settings->type ) {
561	$classes .= ' neverending';
562	}
563	}
564
565	return $classes;
566	}
567
568	/**
569	* In case IS is activated on search page, we have to exclude initially loaded posts which match the keyword by title, not the content as they are displayed before content-matching ones
570	*
571	* @uses self::wp_query
572	* @uses self::get_last_post_date
573	* @uses self::has_only_title_matching_posts
574	* @return array
575	*/
576	public function get_excluded_posts() {
577
578	$excluded_posts = array();
579	// loop through posts returned by wp_query call
580	foreach ( self::wp_query()->get_posts() as $post ) {
581	if ( ! $post instanceof \WP_Post ) {
582	continue;
583	}
584
585	$orderby = isset( self::wp_query()->query_vars['orderby'] ) ? self::wp_query()->query_vars['orderby'] : '';
586	$post_date = ( ! empty( $post->post_date ) ? $post->post_date : false );
587	if ( 'modified' === $orderby \|\| false === $post_date ) {
588	$post_date = $post->post_modified;
589	}
590
591	// in case all posts initially displayed match the keyword by title we add em all to excluded posts array
592	// else, we add only posts which are older than last_post_date param as newer are natually excluded by last_post_date condition in the SQL query
593	if ( self::has_only_title_matching_posts() \|\| $post_date <= self::get_last_post_date() ) {
594	array_push( $excluded_posts, $post->ID );
595	}
596	}
597	return $excluded_posts;
598	}
599
600	/**
601	* In case IS is active on search, we have to exclude posts matched by title rather than by post_content in order to prevent dupes on next pages
602	*
603	* @uses self::wp_query
604	* @uses self::get_excluded_posts
605	* @return array
606	*/
607	public function get_query_vars() {
608
609	$query_vars = self::wp_query()->query_vars;
610	// applies to search page only
611	if ( true === self::wp_query()->is_search() ) {
612	// set post__not_in array in query_vars in case it does not exists
613	if ( false === isset( $query_vars['post__not_in'] ) ) {
614	$query_vars['post__not_in'] = array();
615	}
616	// get excluded posts
617	$excluded = self::get_excluded_posts();
618	// merge them with other post__not_in posts (eg.: sticky posts)
619	$query_vars['post__not_in'] = array_merge( $query_vars['post__not_in'], $excluded );
620	}
621	return $query_vars;
622	}
623
624	/**
625	* This function checks whether all posts returned by initial wp_query match the keyword by title
626	* The code used in this function is borrowed from WP_Query class where it is used to construct like conditions for keywords
627	*
628	* @uses self::wp_query
629	* @return bool
630	*/
631	public function has_only_title_matching_posts() {
632
633	// apply following logic for search page results only
634	if ( false === self::wp_query()->is_search() ) {
635	return false;
636	}
637
638	// grab the last posts in the stack as if the last one is title-matching the rest is title-matching as well
639	$post = end( self::wp_query()->posts );
640
641	// code inspired by WP_Query class
642	if ( preg_match_all( '/".*?("\|$)\|((?<=[\t ",+])\|^)[^\t ",+]+/', self::wp_query()->get( 's' ), $matches ) ) {
643	$search_terms = self::wp_query()->query_vars['search_terms'] ?? null;
644	// if the search string has only short terms or stopwords, or is 10+ terms long, match it as sentence
645	if ( empty( $search_terms ) \|\| ! is_countable( $search_terms ) \|\| count( $search_terms ) > 9 ) {
646	$search_terms = array( self::wp_query()->get( 's' ) );
647	}
648	} else {
649	$search_terms = array( self::wp_query()->get( 's' ) );
650	}
651
652	// actual testing. As search query combines multiple keywords with AND, it's enough to check if any of the keywords is present in the title
653	$term = current( $search_terms );
654	if ( ! empty( $term ) && str_contains( $post->post_title, $term ) ) {
655	return true;
656	}
657
658	return false;
659	}
660
661	/**
662	* Grab the timestamp for the initial query's last post.
663	*
664	* This takes into account the query's 'orderby' parameter and returns
665	* false if the posts are not ordered by date.
666	*
667	* @uses self::got_infinity
668	* @uses self::has_only_title_matching_posts
669	* @uses self::wp_query
670	* @return string 'Y-m-d H:i:s' or false
671	*/
672	public function get_last_post_date() {
673	if ( self::got_infinity() ) {
674	return;
675	}
676
677	if ( ! self::wp_query()->have_posts() ) {
678	return null;
679	}
680
681	// In case there are only title-matching posts in the initial WP_Query result, we don't want to use the last_post_date param yet
682	if ( true === self::has_only_title_matching_posts() ) {
683	return false;
684	}
685
686	$post = end( self::wp_query()->posts );
687	$orderby = isset( self::wp_query()->query_vars['orderby'] ) ?
688	self::wp_query()->query_vars['orderby'] : '';
689	$post_date = ( ! empty( $post->post_date ) ? $post->post_date : false );
690	switch ( $orderby ) {
691	case 'modified':
692	return $post->post_modified;
693	case 'date':
694	case '':
695	return $post_date;
696	default:
697	return false;
698	}
699	}
700
701	/**
702	* Returns the appropriate `wp_posts` table field for a given query's
703	* 'orderby' parameter, if applicable.
704	*
705	* @param object $query - an optional query object.
706	* @uses self::wp_query
707	* @return string or false
708	*/
709	public function get_query_sort_field( $query = null ) {
710	if ( empty( $query ) ) {
711	$query = self::wp_query();
712	}
713
714	$orderby = isset( $query->query_vars['orderby'] ) ? $query->query_vars['orderby'] : '';
715
716	switch ( $orderby ) {
717	case 'modified':
718	return 'post_modified';
719	case 'date':
720	case '':
721	return 'post_date';
722	default:
723	return false;
724	}
725	}
726
727	/**
728	* Create a where clause that will make sure post queries return posts
729	* in the correct order, without duplicates, if a new post is added
730	* and we're sorting by post date.
731	*
732	* @global $wpdb
733	* @param string $where - the where clause.
734	* @param object $query - the query.
735	* @uses apply_filters
736	* @filter posts_where
737	* @return string
738	*/
739	public function query_time_filter( $where, $query ) {
740	if ( self::got_infinity() ) {
741	global $wpdb;
742
743	$sort_field = self::get_query_sort_field( $query );
744
745	if ( 'post_date' !== $sort_field \|\|
746	! isset( $_REQUEST['query_args']['order'] ) \|\| 'DESC' !== $_REQUEST['query_args']['order'] ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no changes made to the site.
747	return $where;
748	}
749
750	$query_before = isset( $_REQUEST['query_before'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['query_before'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no changes made to the site.
751
752	if ( empty( $query_before ) ) {
753	return $where;
754	}
755
756	// Construct the date query using our timestamp
757	$clause = $wpdb->prepare( " AND {$wpdb->posts}.post_date <= %s", $query_before );
758
759	/**
760	* Filter Infinite Scroll's SQL date query making sure post queries
761	* will always return results prior to (descending sort)
762	* or before (ascending sort) the last post date.
763	*
764	* @deprecated 14.0
765	*
766	* @module infinite-scroll
767	*
768	* @param string $clause SQL Date query.
769	* @param object $query Query.
770	* @param string $operator @deprecated Query operator.
771	* @param string $last_post_date @deprecated Last Post Date timestamp.
772	*/
773	$operator = '<';
774	$last_post_date = isset( $_REQUEST['last_post_date'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['last_post_date'] ) ) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no changes to the site
775	$where .= apply_filters_deprecated( 'infinite_scroll_posts_where', array( $clause, $query, $operator, $last_post_date ), '14.0', '' );
776	}
777
778	return $where;
779	}
780
781	/**
782	* Let's overwrite the default post_per_page setting to always display a fixed amount.
783	*
784	* @param object $query - the query.
785	* @uses is_admin, self::archive_supports_infinity, self::get_settings
786	*/
787	public function posts_per_page_query( $query ) {
788	if ( ! is_admin() && self::archive_supports_infinity() && $query->is_main_query() ) {
789	$query->set( 'posts_per_page', self::posts_per_page() );
790	}
791	}
792
793	/**
794	* Check if the IS output should be wrapped in a div.
795	* Setting value can be a boolean or a string specifying the class applied to the div.
796	*
797	* @uses self::get_settings
798	* @return bool
799	*/
800	public function has_wrapper() {
801	return (bool) self::get_settings()->wrapper;
802	}
803
804	/**
805	* Returns the Ajax url
806	*
807	* @global $wp
808	* @uses home_url, add_query_arg, apply_filters
809	* @return string
810	*/
811	public function ajax_url() {
812	$base_url = set_url_scheme( home_url( '/' ) );
813
814	$ajaxurl = add_query_arg( array( 'infinity' => 'scrolling' ), $base_url );
815
816	/**
817	* Filter the Infinite Scroll Ajax URL.
818	*
819	* @module infinite-scroll
820	*
821	* @since 2.0.0
822	*
823	* @param string $ajaxurl Infinite Scroll Ajax URL.
824	*/
825	return apply_filters( 'infinite_scroll_ajax_url', $ajaxurl );
826	}
827
828	/**
829	* Our own Ajax response, avoiding calling admin-ajax
830	*/
831	public function ajax_response() {
832	// Only proceed if the url query has a key of "Infinity"
833	if ( ! self::got_infinity() ) {
834	return false;
835	}
836
837	// This should already be defined below, but make sure.
838	if ( ! defined( 'DOING_AJAX' ) ) {
839	define( 'DOING_AJAX', true );
840	}
841
842	@header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
843	send_nosniff_header();
844
845	/**
846	* Fires at the end of the Infinite Scroll Ajax response.
847	*
848	* @module infinite-scroll
849	*
850	* @since 2.0.0
851	*/
852	do_action( 'custom_ajax_infinite_scroll' );
853	die( '0' );
854	}
855
856	/**
857	* Alias for renamed class method.
858	*
859	* Previously, JS settings object was unnecessarily output in the document head.
860	* When the hook was changed, the method name no longer made sense.
861	*/
862	public function action_wp_head() {
863	$this->action_wp_footer_settings();
864	}
865
866	/**
867	* Prints the relevant infinite scroll settings in JS.
868	*
869	* @global $wp_rewrite
870	* @uses self::get_settings, esc_js, esc_url_raw, self::has_wrapper, __, apply_filters, do_action, self::get_query_vars
871	* @action wp_footer
872	*/
873	public function action_wp_footer_settings() {
874	global $wp_rewrite;
875	global $currentday;
876
877	$settings = self::get_settings();
878
879	// Default click handle text
880	$click_handle_text = __( 'Older posts', 'jetpack' );
881
882	// If a single CPT is displayed, use its plural name instead of "posts"
883	// Could be empty (posts) or an array of multiple post types.
884	// In the latter two cases cases, the default text is used, leaving the `infinite_scroll_js_settings` filter for further customization.
885	$post_type = self::wp_query()->get( 'post_type' );
886
887	// If it's a taxonomy, try to change the button text.
888	if ( is_tax() ) {
889	// Get current taxonomy slug.
890	$taxonomy_slug = self::wp_query()->get( 'taxonomy' );
891
892	// Get taxonomy settings.
893	$taxonomy = get_taxonomy( $taxonomy_slug );
894
895	// Check if the taxonomy is attached to one post type only and use its plural name.
896	// If not, use "Posts" without confusing the users.
897	if (
898	is_a( $taxonomy, 'WP_Taxonomy' )
899	&& is_countable( $taxonomy->object_type )
900	&& ! empty( $taxonomy->object_type )
901	&& count( $taxonomy->object_type ) < 2
902	) {
903	$post_type = $taxonomy->object_type[0];
904	}
905	}
906
907	if ( is_string( $post_type ) && ! empty( $post_type ) ) {
908	$post_type = get_post_type_object( $post_type );
909
910	if ( is_object( $post_type ) && ! is_wp_error( $post_type ) ) {
911	if ( isset( $post_type->labels->name ) ) {
912	$cpt_text = $post_type->labels->name;
913	} elseif ( isset( $post_type->label ) ) {
914	$cpt_text = $post_type->label;
915	}
916
917	if ( isset( $cpt_text ) ) {
918	/* translators: %s is the name of a custom post type */
919	$click_handle_text = sprintf( __( 'More %s', 'jetpack' ), $cpt_text );
920	unset( $cpt_text );
921	}
922	}
923	}
924
925	unset( $post_type );
926
927	// Base JS settings
928	$js_settings = array(
929	'id' => $settings->container,
930	'ajaxurl' => esc_url_raw( self::ajax_url() ),
931	'type' => esc_js( $settings->type ),
932	'wrapper' => self::has_wrapper(),
933	'wrapper_class' => is_string( $settings->wrapper ) ? esc_js( $settings->wrapper ) : 'infinite-wrap',
934	'footer' => is_string( $settings->footer ) ? esc_js( $settings->footer ) : $settings->footer,
935	'click_handle' => esc_js( $settings->click_handle ),
936	'text' => $click_handle_text,
937	'totop' => __( 'Scroll back to top', 'jetpack' ),
938	'currentday' => $currentday,
939	'order' => 'DESC',
940	'scripts' => array(),
941	'styles' => array(),
942	'google_analytics' => false,
943	'offset' => max( 1, self::wp_query()->get( 'paged' ) ), // Pass through the current page so we can use that to offset the first load.
944	'history' => array(
945	'host' => preg_replace( '#^http(s)?://#i', '', untrailingslashit( esc_url( get_home_url() ) ) ),
946	'path' => self::get_request_path(),
947	'use_trailing_slashes' => $wp_rewrite->use_trailing_slashes,
948	'parameters' => self::get_request_parameters(),
949	),
950	'query_args' => self::get_query_vars(),
951	'query_before' => current_time( 'mysql' ),
952	'last_post_date' => self::get_last_post_date(),
953	'body_class' => self::body_class(),
954	'loading_text' => __( 'Loading new page', 'jetpack' ),
955	);
956
957	// Optional order param
958	if ( isset( $_REQUEST['order'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no changes made to the site.
959	$order = strtoupper( sanitize_text_field( wp_unslash( $_REQUEST['order'] ) ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no changes made to the site.
960
961	if ( in_array( $order, array( 'ASC', 'DESC' ), true ) ) {
962	$js_settings['order'] = $order;
963	}
964	}
965
966	/**
967	* Filter the Infinite Scroll JS settings outputted in the head.
968	*
969	* @module infinite-scroll
970	*
971	* @since 2.0.0
972	*
973	* @param array $js_settings Infinite Scroll JS settings.
974	*/
975	$js_settings = apply_filters( 'infinite_scroll_js_settings', $js_settings );
976
977	/**
978	* Fires before Infinite Scroll outputs inline JavaScript in the head.
979	*
980	* @module infinite-scroll
981	*
982	* @since 2.0.0
983	*/
984	do_action( 'infinite_scroll_wp_head' );
985
986	?>
987	<script type="text/javascript">
988	var infiniteScroll = <?php echo wp_json_encode( array( 'settings' => $js_settings ), JSON_UNESCAPED_SLASHES \| JSON_HEX_TAG \| JSON_HEX_AMP ); ?>;
989	</script>
990	<?php
991	}
992
993	// phpcs:disable WordPress.WP.GlobalVariablesOverride.Prohibited
994
995	/**
996	* Build path data for current request.
997	* Used for Google Analytics and pushState history tracking.
998	*
999	* @global $wp_rewrite
1000	* @global $wp
1001	* @uses user_trailingslashit, sanitize_text_field, add_query_arg
1002	* @return string\|bool
1003	*/
1004	private function get_request_path() {
1005	global $wp_rewrite;
1006
1007	if ( $wp_rewrite->using_permalinks() ) {
1008	global $wp;
1009
1010	// If called too early, bail
1011	if ( ! isset( $wp->request ) ) {
1012	return false;
1013	}
1014
1015	// Determine path for paginated version of current request
1016	if ( preg_match( '#' . preg_quote( $wp_rewrite->pagination_base, '#' ) . '/\d+/?$#i', $wp->request ) ) {
1017	$path = preg_replace( '#' . preg_quote( $wp_rewrite->pagination_base, '#' ) . '/\d+$#i', $wp_rewrite->pagination_base . '/%d', $wp->request );
1018	} else {
1019	$path = $wp->request . '/' . $wp_rewrite->pagination_base . '/%d';
1020	}
1021
1022	// Slashes everywhere we need them
1023	if ( ! str_starts_with( $path, '/' ) ) {
1024	$path = '/' . $path;
1025	}
1026
1027	$path = user_trailingslashit( $path );
1028	} else {
1029	// Clean up raw $_REQUEST input
1030	$path = array_map( 'sanitize_text_field', wp_unslash( $_REQUEST ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- seems this is used for Google Analytics and browser history tracking.
1031	$path = array_filter( $path );
1032
1033	$path['paged'] = '%d';
1034
1035	$path = add_query_arg( $path, '/' );
1036	}
1037
1038	return empty( $path ) ? false : $path;
1039	}
1040
1041	/**
1042	* Return query string for current request, prefixed with '?'.
1043	*
1044	* @return string
1045	*/
1046	private function get_request_parameters() {
1047	$uri = isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '';
1048	$uri = preg_replace( '/^[^?](\?.$)/', '$1', $uri, 1, $count );
1049	if ( $count !== 1 ) {
1050	return '';
1051	}
1052	return $uri;
1053	}
1054
1055	/**
1056	* Provide IS with a list of the scripts and stylesheets already present on the page.
1057	* Since posts may contain require additional assets that haven't been loaded, this data will be used to track the additional assets.
1058	*
1059	* @global $wp_scripts, $wp_styles
1060	* @action wp_footer
1061	*/
1062	public function action_wp_footer() {
1063	global $wp_scripts, $wp_styles;
1064
1065	$scripts = is_a( $wp_scripts, 'WP_Scripts' ) ? $wp_scripts->done : array();
1066	/**
1067	* Filter the list of scripts already present on the page.
1068	*
1069	* @module infinite-scroll
1070	*
1071	* @since 2.1.2
1072	*
1073	* @param array $scripts Array of scripts present on the page.
1074	*/
1075	$scripts = apply_filters( 'infinite_scroll_existing_scripts', $scripts );
1076
1077	$styles = is_a( $wp_styles, 'WP_Styles' ) ? $wp_styles->done : array();
1078	/**
1079	* Filter the list of styles already present on the page.
1080	*
1081	* @module infinite-scroll
1082	*
1083	* @since 2.1.2
1084	*
1085	* @param array $styles Array of styles present on the page.
1086	*/
1087	$styles = apply_filters( 'infinite_scroll_existing_stylesheets', $styles );
1088
1089	?>
1090	<script type="text/javascript">
1091	(function() {
1092	var extend = function(out) {
1093	out = out \|\| {};
1094
1095	for (var i = 1; i < arguments.length; i++) {
1096	if (!arguments[i])
1097	continue;
1098
1099	for (var key in arguments[i]) {
1100	if (arguments[i].hasOwnProperty(key))
1101	out[key] = arguments[i][key];
1102	}
1103	}
1104
1105	return out;
1106	};
1107	extend( window.infiniteScroll.settings.scripts, <?php echo wp_json_encode( $scripts, JSON_UNESCAPED_SLASHES \| JSON_HEX_TAG \| JSON_HEX_AMP ); ?> );
1108	extend( window.infiniteScroll.settings.styles, <?php echo wp_json_encode( $styles, JSON_UNESCAPED_SLASHES \| JSON_HEX_TAG \| JSON_HEX_AMP ); ?> );
1109	})();
1110	</script>
1111	<?php
1112	$aria_live = 'assertive';
1113	if ( 'scroll' === self::get_settings()->type ) {
1114	$aria_live = 'polite';
1115	}
1116	?>
1117	<span id="infinite-aria" aria-live="<?php echo esc_attr( $aria_live ); ?>"></span>
1118	<?php
1119	}
1120
1121	/**
1122	* Identify additional scripts required by the latest set of IS posts and provide the necessary data to the IS response handler.
1123	*
1124	* @param array $results - the results.
1125	* @param array $query_args - Array of Query arguments.
1126	* @param array $wp_query - the WP query.
1127	* @global $wp_scripts
1128	* @uses sanitize_text_field, add_query_arg
1129	* @filter infinite_scroll_results
1130	* @return array
1131	*/
1132	public function filter_infinite_scroll_results( $results, $query_args, $wp_query ) {
1133	// Don't bother unless there are posts to display
1134	if ( 'success' !== $results['type'] ) {
1135	return $results;
1136	}
1137
1138	// Parse and sanitize the script handles already output
1139	$initial_scripts = isset( $_REQUEST['scripts'] ) && is_array( $_REQUEST['scripts'] ) ? array_map( 'sanitize_text_field', wp_unslash( $_REQUEST['scripts'] ) ) : false; // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no site changes made.
1140
1141	if ( is_array( $initial_scripts ) ) {
1142	global $wp_scripts;
1143
1144	// Identify new scripts needed by the latest set of IS posts
1145	$new_scripts = array_filter(
1146	$wp_scripts->done,
1147	function ( $script_name ) use ( $initial_scripts ) {
1148	// Jetpack block scripts should always be sent, even if they've been
1149	// sent before. These scripts only run once on when loaded, they don't
1150	// watch for new blocks being added.
1151	if ( str_starts_with( $script_name, 'jetpack-block-' ) ) {
1152	return true;
1153	}
1154
1155	return ! in_array( $script_name, $initial_scripts, true );
1156	}
1157	);
1158
1159	// If new scripts are needed, extract relevant data from $wp_scripts
1160	if ( ! empty( $new_scripts ) ) {
1161	$results['scripts'] = array();
1162
1163	foreach ( $new_scripts as $handle ) {
1164	// Abort if somehow the handle doesn't correspond to a registered script
1165	// or if the script doesn't have `src` set.
1166	$script_not_registered = ! isset( $wp_scripts->registered[ $handle ] );
1167	$empty_src = empty( $wp_scripts->registered[ $handle ]->src );
1168	if ( $script_not_registered \|\| $empty_src ) {
1169	continue;
1170	}
1171
1172	$before_handle = $wp_scripts->get_inline_script_data( $handle, 'before' );
1173	$after_handle = $wp_scripts->get_inline_script_data( $handle, 'after' );
1174
1175	// Provide basic script data
1176	$script_data = array(
1177	'handle' => $handle,
1178	'footer' => ( is_array( $wp_scripts->in_footer ) && in_array( $handle, $wp_scripts->in_footer, true ) ),
1179	'extra_data' => $wp_scripts->print_extra_script( $handle, false ),
1180	'before_handle' => $before_handle,
1181	'after_handle' => $after_handle,
1182	);
1183
1184	// Base source
1185	$src = $wp_scripts->registered[ $handle ]->src;
1186
1187	// Take base_url into account
1188	if ( strpos( $src, 'http' ) !== 0 ) {
1189	$src = $wp_scripts->base_url . $src;
1190	}
1191
1192	// Version and additional arguments
1193	if ( null === $wp_scripts->registered[ $handle ]->ver ) {
1194	$ver = '';
1195	} else {
1196	$ver = $wp_scripts->registered[ $handle ]->ver ? $wp_scripts->registered[ $handle ]->ver : $wp_scripts->default_version;
1197	}
1198
1199	if ( isset( $wp_scripts->args[ $handle ] ) ) {
1200	$ver = $ver ? $ver . '&' . $wp_scripts->args[ $handle ] : $wp_scripts->args[ $handle ];
1201	}
1202
1203	// Full script source with version info
1204	$script_data['src'] = add_query_arg( 'ver', $ver, $src );
1205
1206	// Add script to data that will be returned to IS JS
1207	array_push( $results['scripts'], $script_data );
1208	}
1209	}
1210	}
1211
1212	// Expose additional script data to filters, but only include in final `$results` array if needed.
1213	if ( ! isset( $results['scripts'] ) ) {
1214	$results['scripts'] = array();
1215	}
1216
1217	/**
1218	* Filter the additional scripts required by the latest set of IS posts.
1219	*
1220	* @module infinite-scroll
1221	*
1222	* @since 2.1.2
1223	*
1224	* @param array $results['scripts'] Additional scripts required by the latest set of IS posts.
1225	* @param array\|bool $initial_scripts Set of scripts loaded on each page.
1226	* @param array $results Array of Infinite Scroll results.
1227	* @param array $query_args Array of Query arguments.
1228	* @param WP_Query $wp_query WP Query.
1229	*/
1230	$results['scripts'] = apply_filters(
1231	'infinite_scroll_additional_scripts',
1232	$results['scripts'],
1233	$initial_scripts,
1234	$results,
1235	$query_args,
1236	$wp_query
1237	);
1238
1239	if ( empty( $results['scripts'] ) ) {
1240	unset( $results['scripts'] );
1241	}
1242
1243	// Parse and sanitize the style handles already output
1244	$initial_styles = isset( $_REQUEST['styles'] ) && is_array( $_REQUEST['styles'] ) ? array_map( 'sanitize_text_field', wp_unslash( $_REQUEST['styles'] ) ) : false; // phpcs:ignore WordPress.Security.NonceVerification.Recommended
1245
1246	if ( is_array( $initial_styles ) ) {
1247	global $wp_styles;
1248
1249	// Identify new styles needed by the latest set of IS posts
1250	$new_styles = array_diff( $wp_styles->done, $initial_styles );
1251
1252	// If new styles are needed, extract relevant data from $wp_styles
1253	if ( ! empty( $new_styles ) ) {
1254	$results['styles'] = array();
1255
1256	foreach ( $new_styles as $handle ) {
1257	// Abort if somehow the handle doesn't correspond to a registered stylesheet
1258	if ( ! isset( $wp_styles->registered[ $handle ] ) ) {
1259	continue;
1260	}
1261
1262	// Provide basic style data
1263	$style_data = array(
1264	'handle' => $handle,
1265	'media' => 'all',
1266	);
1267
1268	// Base source
1269	$src = $wp_styles->registered[ $handle ]->src;
1270
1271	// Take base_url into account
1272	if ( strpos( $src, 'http' ) !== 0 ) {
1273	$src = $wp_styles->base_url . $src;
1274	}
1275
1276	// Version and additional arguments
1277	if ( null === $wp_styles->registered[ $handle ]->ver ) {
1278	$ver = '';
1279	} else {
1280	$ver = $wp_styles->registered[ $handle ]->ver ? $wp_styles->registered[ $handle ]->ver : $wp_styles->default_version;
1281	}
1282
1283	if ( isset( $wp_styles->args[ $handle ] ) ) {
1284	$ver = $ver ? $ver . '&' . $wp_styles->args[ $handle ] : $wp_styles->args[ $handle ];
1285	}
1286
1287	// Full stylesheet source with version info
1288	$style_data['src'] = add_query_arg( 'ver', $ver, $src );
1289
1290	// Parse stylesheet's conditional comments if present, converting to logic executable in JS
1291	if ( isset( $wp_styles->registered[ $handle ]->extra['conditional'] ) && $wp_styles->registered[ $handle ]->extra['conditional'] ) {
1292	// First, convert conditional comment operators to standard logical operators. %ver is replaced in JS with the IE version
1293	$style_data['conditional'] = str_replace(
1294	array(
1295	'lte',
1296	'lt',
1297	'gte',
1298	'gt',
1299	),
1300	array(
1301	'%ver <=',
1302	'%ver <',
1303	'%ver >=',
1304	'%ver >',
1305	),
1306	$wp_styles->registered[ $handle ]->extra['conditional']
1307	);
1308
1309	// Next, replace any !IE checks. These shouldn't be present since WP's conditional stylesheet implementation doesn't support them, but someone could be _doing_it_wrong().
1310	$style_data['conditional'] = preg_replace( '#!\sIE(\s\d+){0}#i', '1==2', $style_data['conditional'] );
1311
1312	// Lastly, remove the IE strings
1313	$style_data['conditional'] = str_replace( 'IE', '', $style_data['conditional'] );
1314	}
1315
1316	// Parse requested media context for stylesheet
1317	if ( isset( $wp_styles->registered[ $handle ]->args ) ) {
1318	$style_data['media'] = esc_attr( $wp_styles->registered[ $handle ]->args );
1319	}
1320
1321	// Add stylesheet to data that will be returned to IS JS
1322	array_push( $results['styles'], $style_data );
1323	}
1324	}
1325	}
1326
1327	// Expose additional stylesheet data to filters, but only include in final `$results` array if needed.
1328	if ( ! isset( $results['styles'] ) ) {
1329	$results['styles'] = array();
1330	}
1331
1332	/**
1333	* Filter the additional styles required by the latest set of IS posts.
1334	*
1335	* @module infinite-scroll
1336	*
1337	* @since 2.1.2
1338	*
1339	* @param array $results['styles'] Additional styles required by the latest set of IS posts.
1340	* @param array\|bool $initial_styles Set of styles loaded on each page.
1341	* @param array $results Array of Infinite Scroll results.
1342	* @param array $query_args Array of Query arguments.
1343	* @param WP_Query $wp_query WP Query.
1344	*/
1345	$results['styles'] = apply_filters(
1346	'infinite_scroll_additional_stylesheets',
1347	$results['styles'],
1348	$initial_styles,
1349	$results,
1350	$query_args,
1351	$wp_query
1352	);
1353
1354	if ( empty( $results['styles'] ) ) {
1355	unset( $results['styles'] );
1356	}
1357
1358	// Lastly, return the IS results array
1359	return $results;
1360	}
1361
1362	/**
1363	* Runs the query and returns the results via JSON.
1364	* Triggered by an AJAX request.
1365	*
1366	* @global $wp_query
1367	* @global $wp_the_query
1368	* @uses current_theme_supports, get_option, self::wp_query, current_user_can, apply_filters, self::get_settings, add_filter, WP_Query, remove_filter, have_posts, wp_head, do_action, add_action, this::render, this::has_wrapper, esc_attr, wp_footer, sharing_register_post_for_share_counts, get_the_id
1369	*/
1370	public function query() {
1371	if ( ! isset( $_REQUEST['page'] ) \|\| ! current_theme_supports( 'infinite-scroll' ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no changes to the site.
1372	die( 0 );
1373	}
1374
1375	// @todo see if we should validate this nonce since we use it to form a query.
1376	$page = (int) $_REQUEST['page']; // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- we're casting this to an int and not making changes to the site.
1377
1378	// Sanitize and set $previousday. Expected format: dd.mm.yy
1379	if ( isset( $_REQUEST['currentday'] ) && is_string( $_REQUEST['currentday'] ) && preg_match( '/^\d{2}\.\d{2}\.\d{2}$/', $_REQUEST['currentday'] ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput, WordPress.Security.NonceVerification.Recommended -- manually validating, no changes to site
1380	global $previousday;
1381	$previousday = $_REQUEST['currentday']; // phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput
1382	}
1383
1384	$post_status = array( 'publish' );
1385	if ( current_user_can( 'read_private_posts' ) ) {
1386	array_push( $post_status, 'private' );
1387	}
1388
1389	$order = isset( $_REQUEST['order'] ) && in_array( $_REQUEST['order'], array( 'ASC', 'DESC' ), true ) ? sanitize_text_field( wp_unslash( $_REQUEST['order'] ) ) : 'DESC'; // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no changes made to the site.
1390
1391	$query_args = array_merge(
1392	self::wp_query()->query_vars,
1393	array(
1394	'paged' => $page,
1395	'post_status' => $post_status,
1396	'posts_per_page' => self::posts_per_page(), // phpcs:ignore WordPress.WP.PostsPerPage.posts_per_page_posts_per_page
1397	'order' => $order,
1398	)
1399	);
1400
1401	// 4.0 ?s= compatibility, see https://core.trac.wordpress.org/ticket/11330#comment:50
1402	if ( empty( $query_args['s'] ) && ! isset( self::wp_query()->query['s'] ) ) {
1403	unset( $query_args['s'] );
1404	}
1405
1406	// By default, don't query for a specific page of a paged post object.
1407	// This argument can come from merging self::wp_query() into $query_args above.
1408	// Since IS is only used on archives, we should always display the first page of any paged content.
1409	unset( $query_args['page'] );
1410
1411	/**
1412	* Filter the array of main query arguments.
1413	*
1414	* @module infinite-scroll
1415	*
1416	* @since 2.0.1
1417	*
1418	* @param array $query_args Array of Query arguments.
1419	*/
1420	$query_args = apply_filters( 'infinite_scroll_query_args', $query_args );
1421
1422	add_filter( 'posts_where', array( $this, 'query_time_filter' ), 10, 2 );
1423
1424	$infinite_scroll_query = new WP_Query();
1425	$GLOBALS['wp_the_query'] = $infinite_scroll_query;
1426	$GLOBALS['wp_query'] = $infinite_scroll_query;
1427
1428	$infinite_scroll_query->query( $query_args );
1429
1430	remove_filter( 'posts_where', array( $this, 'query_time_filter' ), 10 );
1431
1432	$results = array();
1433
1434	if ( have_posts() ) {
1435	// Fire wp_head to ensure that all necessary scripts are enqueued. Output isn't used, but scripts are extracted in self::action_wp_footer.
1436	ob_start();
1437	wp_head();
1438	while ( ob_get_length() ) {
1439	ob_end_clean();
1440	}
1441
1442	$results['type'] = 'success';
1443
1444	/**
1445	* Fires when rendering Infinite Scroll posts.
1446	*
1447	* @module infinite-scroll
1448	*
1449	* @since 2.0.0
1450	*/
1451	do_action( 'infinite_scroll_render' );
1452	$results['html'] = ob_get_clean();
1453	if ( empty( $results['html'] ) ) {
1454	/**
1455	* Gather renderer callbacks. These will be called in order and allow multiple callbacks to be queued. Once content is found, no futher callbacks will run.
1456	*
1457	* @module infinite-scroll
1458	*
1459	* @since 6.0.0
1460	*/
1461	$callbacks = apply_filters(
1462	'infinite_scroll_render_callbacks',
1463	array( self::get_settings()->render ) // This is the setting callback e.g. from add theme support.
1464	);
1465
1466	// Append fallback callback. That rhymes.
1467	$callbacks[] = array( $this, 'render' );
1468
1469	foreach ( $callbacks as $callback ) {
1470	if ( false !== $callback && is_callable( $callback ) ) {
1471	rewind_posts();
1472	ob_start();
1473
1474	add_action( 'infinite_scroll_render', $callback );
1475
1476	/**
1477	* This action is already documented above.
1478	* See https://github.com/Automattic/jetpack/pull/16317/
1479	* for more details as to why it was introduced.
1480	*/
1481	do_action( 'infinite_scroll_render' );
1482
1483	// Fire wp_head to ensure that all necessary scripts are enqueued. Output isn't used, but scripts are extracted in self::action_wp_footer.
1484	wp_head();
1485
1486	$results['html'] = ob_get_clean();
1487	remove_action( 'infinite_scroll_render', $callback );
1488	}
1489	if ( ! empty( $results['html'] ) ) {
1490	break;
1491	}
1492	}
1493	}
1494
1495	// If primary and fallback rendering methods fail, prevent further IS rendering attempts. Otherwise, wrap the output if requested.
1496	if ( empty( $results['html'] ) ) {
1497	unset( $results['html'] );
1498	/**
1499	* Fires when Infinite Scoll doesn't render any posts.
1500	*
1501	* @module infinite-scroll
1502	*
1503	* @since 2.0.0
1504	*/
1505	do_action( 'infinite_scroll_empty' );
1506	$results['type'] = 'empty';
1507	} elseif ( $this->has_wrapper() ) {
1508	$wrapper_classes = is_string( self::get_settings()->wrapper ) ? self::get_settings()->wrapper : 'infinite-wrap';
1509	$wrapper_classes .= ' infinite-view-' . $page;
1510	$wrapper_classes = trim( $wrapper_classes );
1511	$aria_label = sprintf(
1512	/* translators: %1$s is the page count */
1513	__( 'Page: %1$d.', 'jetpack' ),
1514	$page
1515	);
1516
1517	$results['html'] = '<div class="' . esc_attr( $wrapper_classes ) . '" id="infinite-view-' . $page . '" data-page-num="' . $page . '" role="region" aria-label="' . esc_attr( $aria_label ) . '">' . $results['html'] . '</div>';
1518	}
1519
1520	// Fire wp_footer to ensure that all necessary scripts are enqueued. Output isn't used, but scripts are extracted in self::action_wp_footer.
1521	ob_start();
1522	wp_footer();
1523	while ( ob_get_length() ) {
1524	ob_end_clean();
1525	}
1526
1527	if ( 'success' === $results['type'] ) {
1528	global $currentday;
1529	$results['lastbatch'] = self::is_last_batch();
1530	$results['currentday'] = $currentday;
1531	}
1532
1533	// Loop through posts to capture sharing data for new posts loaded via Infinite Scroll
1534	if ( 'success' === $results['type'] && function_exists( 'sharing_register_post_for_share_counts' ) ) {
1535	global $jetpack_sharing_counts;
1536
1537	while ( have_posts() ) {
1538	the_post();
1539
1540	sharing_register_post_for_share_counts( get_the_ID() );
1541	}
1542
1543	// If sharing counts are not initialized for any reason, we initialize them here.
1544	if ( ! is_array( $jetpack_sharing_counts ) ) {
1545	$jetpack_sharing_counts = array();
1546	} else {
1547	// Filter out non-string and non-integer values to avoid warnings with array_flip.
1548	$flippable_jetpack_sharing_counts = array_filter(
1549	$jetpack_sharing_counts,
1550	function ( $value ) {
1551	return is_string( $value ) \|\| is_int( $value );
1552	}
1553	);
1554	}
1555
1556	$results['postflair'] = array_flip( $flippable_jetpack_sharing_counts ?? array() );
1557	}
1558	} else {
1559	/** This action is already documented in modules/infinite-scroll/infinity.php */
1560	do_action( 'infinite_scroll_empty' );
1561	$results['type'] = 'empty';
1562	}
1563
1564	wp_send_json(
1565	/**
1566	* Filter the Infinite Scroll results.
1567	*
1568	* @module infinite-scroll
1569	*
1570	* @since 2.0.0
1571	*
1572	* @param array $results Array of Infinite Scroll results.
1573	* @param array $query_args Array of main query arguments.
1574	* @param WP_Query $wp_query WP Query.
1575	*/
1576	apply_filters( 'infinite_scroll_results', $results, $query_args, self::wp_query() ),
1577	null, // @phan-suppress-current-line PhanTypeMismatchArgumentProbablyReal -- It takes null, but its phpdoc only says int.
1578	JSON_UNESCAPED_SLASHES
1579	);
1580	}
1581
1582	/**
1583	* Update the $allowed_vars array with the standard WP public and private
1584	* query vars, as well as taxonomy vars
1585	*
1586	* @global $wp
1587	* @param array $allowed_vars - the allowed variables array.
1588	* @filter infinite_scroll_allowed_vars
1589	* @return array
1590	*/
1591	public function allowed_query_vars( $allowed_vars ) {
1592	global $wp;
1593
1594	$allowed_vars += $wp->public_query_vars;
1595	$allowed_vars += $wp->private_query_vars;
1596	$allowed_vars += $this->get_taxonomy_vars();
1597
1598	foreach ( array_keys( $allowed_vars, 'paged', true ) as $key ) {
1599	unset( $allowed_vars[ $key ] );
1600	}
1601
1602	return array_unique( $allowed_vars );
1603	}
1604
1605	/**
1606	* Returns an array of stock and custom taxonomy query vars
1607	*
1608	* @global $wp_taxonomies
1609	* @return array
1610	*/
1611	public function get_taxonomy_vars() {
1612	global $wp_taxonomies;
1613
1614	$taxonomy_vars = array();
1615	foreach ( $wp_taxonomies as $t ) {
1616	if ( $t->query_var ) {
1617	$taxonomy_vars[] = $t->query_var;
1618	}
1619	}
1620
1621	// still needed?
1622	$taxonomy_vars[] = 'tag_id';
1623
1624	return $taxonomy_vars;
1625	}
1626
1627	/**
1628	* Update the $query_args array with the parameters provided via AJAX/GET.
1629	*
1630	* @param array $query_args - the query args.
1631	* @filter infinite_scroll_query_args
1632	* @return array
1633	*/
1634	public function inject_query_args( $query_args ) {
1635	/**
1636	* Filter the array of allowed Infinite Scroll query arguments.
1637	*
1638	* @module infinite-scroll
1639	*
1640	* @since 2.6.0
1641	*
1642	* @param array $args Array of allowed Infinite Scroll query arguments.
1643	* @param array $query_args Array of query arguments.
1644	*/
1645	$allowed_vars = apply_filters( 'infinite_scroll_allowed_vars', array(), $query_args );
1646
1647	$query_args = array_merge(
1648	$query_args,
1649	array(
1650	'suppress_filters' => false,
1651	)
1652	);
1653
1654	if ( isset( $_REQUEST['query_args'] ) && is_array( $_REQUEST['query_args'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- no site changes.
1655	foreach ( wp_unslash( $_REQUEST['query_args'] ) as $var => $value ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- no site changes, sanitized below.
1656	if ( in_array( $var, $allowed_vars, true ) && ! empty( $value ) ) {
1657	$query_args[ $var ] = filter_var( $value );
1658	}
1659	}
1660	}
1661
1662	return $query_args;
1663	}
1664
1665	/**
1666	* Rendering fallback used when themes don't specify their own handler.
1667	*
1668	* @uses have_posts, the_post, get_template_part, get_post_format
1669	* @action infinite_scroll_render
1670	*/
1671	public function render() {
1672	while ( have_posts() ) {
1673	the_post();
1674
1675	get_template_part( 'content', get_post_format() );
1676	}
1677	}
1678
1679	/**
1680	* Allow plugins to filter what archives Infinite Scroll supports
1681	*
1682	* @uses current_theme_supports, is_home, is_archive, apply_filters, self::get_settings
1683	* @return bool
1684	*/
1685	public static function archive_supports_infinity() {
1686	$supported = current_theme_supports( 'infinite-scroll' ) && ( is_home() \|\| is_archive() \|\| is_search() );
1687
1688	// Disable when previewing a non-active theme in the customizer
1689	if ( is_customize_preview() && ! $GLOBALS['wp_customize']->is_theme_active() ) {
1690	return false;
1691	}
1692
1693	/**
1694	* Allow plugins to filter what archives Infinite Scroll supports.
1695	*
1696	* @module infinite-scroll
1697	*
1698	* @since 2.0.0
1699	*
1700	* @param bool $supported Does the Archive page support Infinite Scroll.
1701	* @param object self::get_settings() IS settings provided by theme.
1702	*/
1703	return (bool) apply_filters( 'infinite_scroll_archive_supported', $supported, self::get_settings() );
1704	}
1705
1706	/**
1707	* The Infinite Blog Footer
1708	*
1709	* @uses self::get_settings, self::archive_supports_infinity, self::default_footer
1710	* @return string or null
1711	*/
1712	public function footer() {
1713	if ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() ) {
1714	return;
1715	}
1716
1717	$settings = self::get_settings();
1718
1719	// Bail if theme requested footer not show
1720	if ( false === $settings->footer ) {
1721	return;
1722	}
1723
1724	// We only need the new footer for the 'scroll' type
1725	if ( 'scroll' !== $settings->type \|\| ! self::archive_supports_infinity() ) {
1726	return;
1727	}
1728
1729	if ( self::is_last_batch() ) {
1730	return;
1731	}
1732
1733	// Display a footer, either user-specified or a default
1734	if ( false !== $settings->footer_callback && is_callable( $settings->footer_callback ) ) {
1735	call_user_func( $settings->footer_callback, $settings );
1736	} else {
1737	self::default_footer();
1738	}
1739	}
1740
1741	/**
1742	* Render default IS footer
1743	*
1744	* @uses __, wp_get_theme, apply_filters, home_url, esc_attr, get_bloginfo, bloginfo
1745	*/
1746	private function default_footer() {
1747	if ( '' !== get_privacy_policy_url() ) {
1748	$credits = get_the_privacy_policy_link() . '<span role="separator" aria-hidden="true"> / </span>';
1749	} else {
1750	$credits = '';
1751	}
1752	$credits .= sprintf(
1753	'<a href="https://wordpress.org/" rel="noopener noreferrer" target="_blank" rel="generator">%1$s</a> ',
1754	__( 'Proudly powered by WordPress', 'jetpack' )
1755	);
1756	$credits .= sprintf(
1757	/* translators: %1$s is the name of a theme */
1758	__( 'Theme: %1$s.', 'jetpack' ),
1759	wp_get_theme()->Name
1760	);
1761	/**
1762	* Filter Infinite Scroll's credit text.
1763	*
1764	* @module infinite-scroll
1765	*
1766	* @since 2.0.0
1767	*
1768	* @param string $credits Infinite Scroll credits.
1769	*/
1770	$credits = apply_filters( 'infinite_scroll_credit', $credits );
1771
1772	?>
1773	<div id="infinite-footer">
1774	<div class="container">
1775	<div class="blog-info">
1776	<a id="infinity-blog-title" href="<?php echo esc_url( home_url( '/' ) ); ?>" rel="home">
1777	<?php bloginfo( 'name' ); ?>
1778	</a>
1779	</div>
1780	<div class="blog-credits">
1781	<?php echo $credits; //phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
1782	</div>
1783	</div>
1784	</div><!-- #infinite-footer -->
1785	<?php
1786	}
1787
1788	/**
1789	* Ensure that IS doesn't interfere with Grunion by stripping IS query arguments from the Grunion redirect URL.
1790	* When arguments are present, Grunion redirects to the IS AJAX endpoint.
1791	*
1792	* @param string $url - the Grunion redirect URL.
1793	* @uses remove_query_arg
1794	* @filter grunion_contact_form_redirect_url
1795	* @return string
1796	*/
1797	public function filter_grunion_redirect_url( $url ) {
1798	// Remove IS query args, if present
1799	if ( str_contains( $url, 'infinity=scrolling' ) ) {
1800	$url = remove_query_arg(
1801	array(
1802	'infinity',
1803	'action',
1804	'page',
1805	'order',
1806	'scripts',
1807	'styles',
1808	),
1809	$url
1810	);
1811	}
1812
1813	return $url;
1814	}
1815
1816	/**
1817	* When the MediaElement is loaded in dynamically, we need to enforce that
1818	* its settings are added to the page as well.
1819	*
1820	* @param array $scripts_data New scripts exposed to the infinite scroll.
1821	*
1822	* @since 8.4.0
1823	*/
1824	public function add_mejs_config( $scripts_data ) {
1825	foreach ( $scripts_data as $key => $data ) {
1826	if ( 'mediaelement-core' === $data['handle'] ) {
1827	$mejs_settings = array(
1828	'pluginPath' => includes_url( 'js/mediaelement/', 'relative' ),
1829	'classPrefix' => 'mejs-',
1830	'stretching' => 'responsive',
1831	);
1832
1833	$scripts_data[ $key ]['extra_data'] = sprintf(
1834	'window.%s = %s',
1835	'_wpmejsSettings',
1836	wp_json_encode( apply_filters( 'mejs_settings', $mejs_settings ), JSON_UNESCAPED_SLASHES \| JSON_HEX_TAG \| JSON_HEX_AMP )
1837	);
1838	}
1839	}
1840	return $scripts_data;
1841	}
1842
1843	/**
1844	* Determines whether the legacy AMP Reader post templates are being used.
1845	*
1846	* @return bool
1847	*/
1848	private function is_exempted_amp_page() {
1849	if ( is_singular( 'web-story' ) ) {
1850	// Ensure that <amp-next-page> is not injected after <amp-story> as generated by the Web Stories plugin.
1851	return true;
1852	}
1853	if ( function_exists( 'amp_is_legacy' ) ) {
1854	// Available since AMP v2.0, this will return false if a theme like Twenty Twenty is selected as the Reader theme.
1855	return amp_is_legacy();
1856	}
1857	if ( method_exists( 'AMP_Options_Manager', 'get_option' ) ) {
1858	// In versions prior to v2.0, checking the template mode as being 'reader' is sufficient.
1859	return 'reader' === AMP_Options_Manager::get_option( 'theme_support' );
1860	}
1861	return false;
1862	}
1863
1864	/**
1865	* Load AMP specific hooks.
1866	*
1867	* @return void
1868	*/
1869	public function amp_load_hooks() {
1870	if ( $this->is_exempted_amp_page() ) {
1871	return;
1872	}
1873
1874	if ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() ) {
1875	$template = self::get_settings()->render;
1876
1877	add_filter( 'jetpack_infinite_scroll_load_scripts_and_styles', '__return_false' );
1878
1879	add_action( 'template_redirect', array( $this, 'amp_start_output_buffering' ), 0 );
1880	add_action( 'shutdown', array( $this, 'amp_output_buffer' ), 1 );
1881
1882	if ( is_string( $template ) && strpos( $template, '::' ) === false && is_callable( "amp_{$template}_hooks" ) ) {
1883	call_user_func( "amp_{$template}_hooks" );
1884	}
1885
1886	// Warms up the amp next page markup.
1887	// This should be done outside the output buffering callback started in the template_redirect.
1888	$this->amp_get_footer_template();
1889	}
1890	}
1891
1892	/**
1893	* Start the AMP output buffering.
1894	*
1895	* @return void
1896	*/
1897	public function amp_start_output_buffering() {
1898	ob_start( array( $this, 'amp_finish_output_buffering' ) );
1899	}
1900
1901	/**
1902	* Flush the AMP output buffer.
1903	*
1904	* @return void
1905	*/
1906	public function amp_output_buffer() {
1907	if ( ob_get_contents() ) {
1908	ob_end_flush();
1909	}
1910	}
1911
1912	/**
1913	* Filter the AMP output buffer contents.
1914	*
1915	* @param string $buffer Contents of the output buffer.
1916	*
1917	* @return string\|false
1918	*/
1919	public function amp_finish_output_buffering( $buffer ) {
1920	// Hide WordPress admin bar on next page load.
1921	$buffer = preg_replace(
1922	'/id="wpadminbar"/',
1923	'$0 next-page-hide',
1924	$buffer
1925	);
1926
1927	/**
1928	* Get the theme footers.
1929	*
1930	* @module infinite-scroll
1931	*
1932	* @since 9.0.0
1933	*
1934	* @param array array() An array to store multiple markup entries to be added to the footer.
1935	* @param string $buffer The contents of the output buffer.
1936	*/
1937	$footers = apply_filters( 'jetpack_amp_infinite_footers', array(), $buffer );
1938
1939	/**
1940	* Filter the output buffer.
1941	* Themes can leverage this hook to add custom markup on next page load.
1942	*
1943	* @module infinite-scroll
1944	*
1945	* @since 9.0.0
1946	*
1947	* @param string $buffer The contents of the output buffer.
1948	*/
1949	$buffer = apply_filters( 'jetpack_amp_infinite_output', $buffer );
1950
1951	// Add the amp next page markup.
1952	$buffer = preg_replace(
1953	'~</body>~',
1954	$this->amp_get_footer_template( $footers ) . '$0',
1955	$buffer
1956	);
1957
1958	return $buffer;
1959	}
1960
1961	/**
1962	* Get AMP next page markup with the custom footers.
1963	*
1964	* @param string[] $footers The theme footers.
1965	*
1966	* @return string
1967	*/
1968	protected function amp_get_footer_template( $footers = array() ) {
1969	static $template = null;
1970
1971	if ( null === $template ) {
1972	$template = $this->amp_footer_template();
1973	}
1974
1975	if ( empty( $footers ) ) {
1976	return $template;
1977	}
1978
1979	return preg_replace(
1980	'/%%footer%%/',
1981	implode( '', $footers ),
1982	$template
1983	);
1984	}
1985
1986	/**
1987	* AMP Next Page markup.
1988	*
1989	* @return string
1990	*/
1991	protected function amp_footer_template() {
1992	ob_start();
1993	?>
1994	<amp-next-page max-pages="<?php echo esc_attr( static::amp_get_max_pages() ); ?>">
1995	<script type="application/json">
1996	[
1997	<?php echo wp_json_encode( $this->amp_next_page(), JSON_UNESCAPED_SLASHES \| JSON_HEX_TAG \| JSON_HEX_AMP ); ?>
1998	]
1999	</script>
2000	<div separator>
2001	<?php
2002	echo wp_kses_post(
2003	/**
2004	* AMP infinite scroll separator.
2005	*
2006	* @module infinite-scroll
2007	*
2008	* @since 9.0.0
2009	*
2010	* @param string '' The markup for the next page separator.
2011	*/
2012	apply_filters( 'jetpack_amp_infinite_separator', '' )
2013	);
2014	?>
2015	</div>
2016	<div recommendation-box class="recommendation-box">
2017	<template type="amp-mustache">
2018	{{#pages}}
2019	<?php
2020	echo wp_kses_post(
2021	/**
2022	* AMP infinite scroll older posts markup.
2023	*
2024	* @module infinite-scroll
2025	*
2026	* @since 9.0.0
2027	*
2028	* @param string '' The markup for the older posts/next page.
2029	*/
2030	apply_filters( 'jetpack_amp_infinite_older_posts', '' )
2031	);
2032	?>
2033	{{/pages}}
2034	</template>
2035	</div>
2036	<div footer>
2037	%%footer%%
2038	</div>
2039	</amp-next-page>
2040	<?php
2041	return ob_get_clean();
2042	}
2043
2044	/**
2045	* Get the AMP next page information.
2046	*
2047	* @return array
2048	*/
2049	protected function amp_next_page() {
2050	$title = '';
2051	$url = '';
2052	$image = '';
2053
2054	if ( ! static::amp_is_last_page() ) {
2055	$title = sprintf(
2056	'%s - %s %d - %s',
2057	wp_title( '', false ),
2058	__( 'Page', 'jetpack' ),
2059	max( get_query_var( 'paged', 1 ), 1 ) + 1,
2060	get_bloginfo( 'name' )
2061	);
2062	$url = get_next_posts_page_link();
2063	}
2064
2065	$next_page = array(
2066	'title' => $title,
2067	'url' => $url,
2068	'image' => $image,
2069	);
2070
2071	/**
2072	* The next page settings.
2073	* An array containing:
2074	* - title => The title to be featured on the browser tab.
2075	* - url => The URL of next page.
2076	* - image => The image URL. A required AMP setting, not in use currently. Themes are welcome to leverage.
2077	*
2078	* @module infinite-scroll
2079	*
2080	* @since 9.0.0
2081	*
2082	* @param array $next_page The contents of the output buffer.
2083	*/
2084	return apply_filters( 'jetpack_amp_infinite_next_page_data', $next_page );
2085	}
2086
2087	/**
2088	* Get the number of pages left.
2089	*
2090	* @return int
2091	*/
2092	protected static function amp_get_max_pages() {
2093	global $wp_query;
2094
2095	return (int) $wp_query->max_num_pages - (int) $wp_query->query_vars['paged'];
2096	}
2097
2098	/**
2099	* Is the last page.
2100	*
2101	* @return bool
2102	*/
2103	protected static function amp_is_last_page() {
2104	return 0 === static::amp_get_max_pages();
2105	}
2106	}
2107
2108	/**
2109	* Initialize The_Neverending_Home_Page
2110	*/
2111	function the_neverending_home_page_init() {
2112	if ( ! current_theme_supports( 'infinite-scroll' ) ) {
2113	return;
2114	}
2115
2116	new The_Neverending_Home_Page();
2117	}
2118	add_action( 'init', 'the_neverending_home_page_init', 20 );
2119
2120	/**
2121	* Check whether the current theme is infinite-scroll aware.
2122	* If so, include the files which add theme support.
2123	*/
2124	function the_neverending_home_page_theme_support() {
2125	if (
2126	defined( 'IS_WPCOM' ) && IS_WPCOM &&
2127	defined( 'REST_API_REQUEST' ) && REST_API_REQUEST &&
2128	! doing_action( 'restapi_theme_after_setup_theme' )
2129	) {
2130	// Don't source theme compat files until we're in the site's context
2131	return;
2132	}
2133	$theme_name = get_stylesheet();
2134
2135	/**
2136	* Filter the path to the Infinite Scroll compatibility file.
2137	*
2138	* @module infinite-scroll
2139	*
2140	* @since 2.0.0
2141	*
2142	* @param string $str IS compatibility file path.
2143	* @param string $theme_name Theme name.
2144	*/
2145	$customization_file = apply_filters( 'infinite_scroll_customization_file', __DIR__ . "/themes/{$theme_name}.php", $theme_name );
2146
2147	if ( is_readable( $customization_file ) ) {
2148	require_once $customization_file;
2149	}
2150	}
2151	add_action( 'after_setup_theme', 'the_neverending_home_page_theme_support', 5 );
2152
2153	/**
2154	* Early accommodation of the Infinite Scroll AJAX request
2155	*/
2156	if ( The_Neverending_Home_Page::got_infinity() ) {
2157	/**
2158	* If we're sure this is an AJAX request (i.e. the HTTP_X_REQUESTED_WITH header says so),
2159	* indicate it as early as possible for actions like init
2160	*/
2161	if ( ! defined( 'DOING_AJAX' ) &&
2162	isset( $_SERVER['HTTP_X_REQUESTED_WITH'] ) &&
2163	strtoupper( sanitize_text_field( wp_unslash( $_SERVER['HTTP_X_REQUESTED_WITH'] ) ) ) === 'XMLHTTPREQUEST'
2164	) {
2165	define( 'DOING_AJAX', true );
2166	}
2167
2168	// Don't load the admin bar when doing the AJAX response.
2169	show_admin_bar( false );
2170	}
2171