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jetpack / modules / theme-tools / featured-content.php

featured-content.php in Jetpack – WP Security, Backup, Speed, & Growth 7.2.2, at modules/theme-tools/featured-content.php

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1 <?php
2
3 if ( ! class_exists( 'Featured_Content' ) && isset( $GLOBALS['pagenow'] ) && 'plugins.php' !== $GLOBALS['pagenow'] ) {
4
5 /**
6 * Featured Content.
7 *
8 * This module will allow users to define a subset of posts to be displayed in a
9 * theme-designated featured content area.
10 *
11 * This feature will only be activated for themes that declare that they support
12 * it. This can be done by adding code similar to the following during the
13 * "after_setup_theme" action:
14 *
15 * add_theme_support( 'featured-content', array(
16 * 'filter' => 'mytheme_get_featured_content',
17 * 'max_posts' => 20,
18 * 'post_types' => array( 'post', 'page' ),
19 * ) );
20 *
21 * For maximum compatibility with different methods of posting users will
22 * designate a featured post tag to associate posts with. Since this tag now has
23 * special meaning beyond that of a normal tags, users will have the ability to
24 * hide it from the front-end of their site.
25 */
26 class Featured_Content {
27
28 /**
29 * The maximum number of posts that a Featured Content area can contain. We
30 * define a default value here but themes can override this by defining a
31 * "max_posts" entry in the second parameter passed in the call to
32 * add_theme_support( 'featured-content' ).
33 *
34 * @see Featured_Content::init()
35 */
36 public static $max_posts = 15;
37
38 /**
39 * The registered post types supported by Featured Content. Themes can add
40 * Featured Content support for registered post types by defining a
41 * 'post_types' argument (string|array) in the call to
42 * add_theme_support( 'featured-content' ).
43 *
44 * @see Featured_Content::init()
45 */
46 public static $post_types = array( 'post' );
47
48 /**
49 * The tag that is used to mark featured content. Users can define
50 * a custom tag name that will be stored in this variable.
51 *
52 * @see Featured_Content::hide_featured_term
53 */
54 public static $tag;
55
56 /**
57 * Instantiate.
58 *
59 * All custom functionality will be hooked into the "init" action.
60 */
61 public static function setup() {
62 add_action( 'init', array( __CLASS__, 'init' ), 30 );
63 }
64
65 /**
66 * Conditionally hook into WordPress.
67 *
68 * Themes must declare that they support this module by adding
69 * add_theme_support( 'featured-content' ); during after_setup_theme.
70 *
71 * If no theme support is found there is no need to hook into WordPress. We'll
72 * just return early instead.
73 *
74 * @uses Featured_Content::$max_posts
75 */
76 public static function init() {
77 $theme_support = get_theme_support( 'featured-content' );
78
79 // Return early if theme does not support featured content.
80 if ( ! $theme_support ) {
81 return;
82 }
83
84 /*
85 * An array of named arguments must be passed as the second parameter
86 * of add_theme_support().
87 */
88 if ( ! isset( $theme_support[0] ) ) {
89 return;
90 }
91
92 if ( isset( $theme_support[0]['featured_content_filter'] ) ) {
93 $theme_support[0]['filter'] = $theme_support[0]['featured_content_filter'];
94 unset( $theme_support[0]['featured_content_filter'] );
95 }
96
97 // Return early if "filter" has not been defined.
98 if ( ! isset( $theme_support[0]['filter'] ) ) {
99 return;
100 }
101
102 // Theme can override the number of max posts.
103 if ( isset( $theme_support[0]['max_posts'] ) ) {
104 self::$max_posts = absint( $theme_support[0]['max_posts'] );
105 }
106
107 add_filter( $theme_support[0]['filter'], array( __CLASS__, 'get_featured_posts' ) );
108 add_action( 'customize_register', array( __CLASS__, 'customize_register' ), 9 );
109 add_action( 'admin_init', array( __CLASS__, 'register_setting' ) );
110 add_action( 'save_post', array( __CLASS__, 'delete_transient' ) );
111 add_action( 'delete_post_tag', array( __CLASS__, 'delete_post_tag' ) );
112 add_action( 'customize_controls_enqueue_scripts', array( __CLASS__, 'enqueue_scripts' ) );
113 add_action( 'pre_get_posts', array( __CLASS__, 'pre_get_posts' ) );
114 add_action( 'switch_theme', array( __CLASS__, 'switch_theme' ) );
115 add_action( 'switch_theme', array( __CLASS__, 'delete_transient' ) );
116 add_action( 'wp_loaded', array( __CLASS__, 'wp_loaded' ) );
117 add_action( 'update_option_featured-content', array( __CLASS__, 'flush_post_tag_cache' ), 10, 2 );
118 add_action( 'delete_option_featured-content', array( __CLASS__, 'flush_post_tag_cache' ), 10, 2 );
119 add_action( 'split_shared_term', array( __CLASS__, 'jetpack_update_featured_content_for_split_terms', 10, 4 ) );
120
121 if ( isset( $theme_support[0]['additional_post_types'] ) ) {
122 $theme_support[0]['post_types'] = array_merge( array( 'post' ), (array) $theme_support[0]['additional_post_types'] );
123 unset( $theme_support[0]['additional_post_types'] );
124 }
125
126 // Themes can allow Featured Content pages
127 if ( isset( $theme_support[0]['post_types'] ) ) {
128 self::$post_types = array_merge( self::$post_types, (array) $theme_support[0]['post_types'] );
129 self::$post_types = array_unique( self::$post_types );
130
131 // register post_tag support for each post type
132 foreach ( self::$post_types as $post_type ) {
133 register_taxonomy_for_object_type( 'post_tag', $post_type );
134 }
135 }
136 }
137
138 /**
139 * Hide "featured" tag from the front-end.
140 *
141 * Has to run on wp_loaded so that the preview filters of the customizer
142 * have a chance to alter the value.
143 */
144 public static function wp_loaded() {
145 if ( self::get_setting( 'hide-tag' ) ) {
146 $settings = self::get_setting();
147
148 // This is done before setting filters for get_terms in order to avoid an infinite filter loop
149 self::$tag = get_term_by( 'name', $settings['tag-name'], 'post_tag' );
150
151 add_filter( 'get_terms', array( __CLASS__, 'hide_featured_term' ), 10, 3 );
152 add_filter( 'get_the_terms', array( __CLASS__, 'hide_the_featured_term' ), 10, 3 );
153 }
154 }
155
156 /**
157 * Get featured posts
158 *
159 * This method is not intended to be called directly. Theme developers should
160 * place a filter directly in their theme and then pass its name as a value of
161 * the "filter" key in the array passed as the $args parameter during the call
162 * to: add_theme_support( 'featured-content', $args ).
163 *
164 * @uses Featured_Content::get_featured_post_ids()
165 *
166 * @return array
167 */
168 public static function get_featured_posts() {
169 $post_ids = self::get_featured_post_ids();
170
171 // No need to query if there is are no featured posts.
172 if ( empty( $post_ids ) ) {
173 return array();
174 }
175
176 $featured_posts = get_posts(
177 array(
178 'include' => $post_ids,
179 'posts_per_page' => count( $post_ids ),
180 'post_type' => self::$post_types,
181 'suppress_filters' => false,
182 )
183 );
184
185 return $featured_posts;
186 }
187
188 /**
189 * Get featured post IDs
190 *
191 * This function will return the an array containing the post IDs of all
192 * featured posts.
193 *
194 * Sets the "featured_content_ids" transient.
195 *
196 * @return array Array of post IDs.
197 */
198 public static function get_featured_post_ids() {
199 // Return array of cached results if they exist.
200 $featured_ids = get_transient( 'featured_content_ids' );
201 if ( ! empty( $featured_ids ) ) {
202 return array_map(
203 'absint',
204 /**
205 * Filter the list of Featured Posts IDs.
206 *
207 * @module theme-tools
208 *
209 * @since 2.7.0
210 *
211 * @param array $featured_ids Array of post IDs.
212 */
213 apply_filters( 'featured_content_post_ids', (array) $featured_ids )
214 );
215 }
216
217 $settings = self::get_setting();
218
219 // Return empty array if no tag name is set.
220 $term = get_term_by( 'name', $settings['tag-name'], 'post_tag' );
221 if ( ! $term ) {
222 $term = get_term_by( 'id', $settings['tag-id'], 'post_tag' );
223 }
224 if ( $term ) {
225 $tag = $term->term_id;
226 } else {
227 /** This action is documented in modules/theme-tools/featured-content.php */
228 return apply_filters( 'featured_content_post_ids', array() );
229 }
230
231 // Back compat for installs that have the quantity option still set.
232 $quantity = isset( $settings['quantity'] ) ? $settings['quantity'] : self::$max_posts;
233
234 // Query for featured posts.
235 $featured = get_posts(
236 array(
237 'numberposts' => $quantity,
238 'post_type' => self::$post_types,
239 'suppress_filters' => false,
240 'tax_query' => array(
241 array(
242 'field' => 'term_id',
243 'taxonomy' => 'post_tag',
244 'terms' => $tag,
245 ),
246 ),
247 )
248 );
249
250 // Return empty array if no featured content exists.
251 if ( ! $featured ) {
252 /** This action is documented in modules/theme-tools/featured-content.php */
253 return apply_filters( 'featured_content_post_ids', array() );
254 }
255
256 // Ensure correct format before save/return.
257 $featured_ids = wp_list_pluck( (array) $featured, 'ID' );
258 $featured_ids = array_map( 'absint', $featured_ids );
259
260 set_transient( 'featured_content_ids', $featured_ids );
261
262 /** This action is documented in modules/theme-tools/featured-content.php */
263 return apply_filters( 'featured_content_post_ids', $featured_ids );
264 }
265
266 /**
267 * Delete Transient.
268 *
269 * Hooks in the "save_post" action.
270 *
271 * @see Featured_Content::validate_settings().
272 */
273 public static function delete_transient() {
274 delete_transient( 'featured_content_ids' );
275 }
276
277 /**
278 * Flush the Post Tag relationships cache.
279 *
280 * Hooks in the "update_option_featured-content" action.
281 */
282 public static function flush_post_tag_cache( $prev, $opts ) {
283 if ( ! empty( $opts ) && ! empty( $opts['tag-id'] ) ) {
284 $query = new WP_Query(
285 array(
286 'tag_id' => (int) $opts['tag-id'],
287 'posts_per_page' => -1,
288 )
289 );
290 foreach ( $query->posts as $post ) {
291 wp_cache_delete( $post->ID, 'post_tag_relationships' );
292 }
293 }
294 }
295
296 /**
297 * Exclude featured posts from the blog query when the blog is the front-page,
298 * and user has not checked the "Also display tagged posts outside the Featured Content area" checkbox.
299 *
300 * Filter the home page posts, and remove any featured post ID's from it.
301 * Hooked onto the 'pre_get_posts' action, this changes the parameters of the
302 * query before it gets any posts.
303 *
304 * @uses Featured_Content::get_featured_post_ids();
305 * @uses Featured_Content::get_setting();
306 * @param WP_Query $query
307 * @return WP_Query Possibly modified WP_Query
308 */
309 public static function pre_get_posts( $query ) {
310
311 // Bail if not home or not main query.
312 if ( ! $query->is_home() || ! $query->is_main_query() ) {
313 return;
314 }
315
316 // Bail if the blog page is not the front page.
317 if ( 'posts' !== get_option( 'show_on_front' ) ) {
318 return;
319 }
320
321 $featured = self::get_featured_post_ids();
322
323 // Bail if no featured posts.
324 if ( ! $featured ) {
325 return;
326 }
327
328 $settings = self::get_setting();
329
330 // Bail if the user wants featured posts always displayed.
331 if ( true == $settings['show-all'] ) {
332 return;
333 }
334
335 // We need to respect post ids already in the blacklist.
336 $post__not_in = $query->get( 'post__not_in' );
337
338 if ( ! empty( $post__not_in ) ) {
339 $featured = array_merge( (array) $post__not_in, $featured );
340 $featured = array_unique( $featured );
341 }
342
343 $query->set( 'post__not_in', $featured );
344 }
345
346 /**
347 * Reset tag option when the saved tag is deleted.
348 *
349 * It's important to mention that the transient needs to be deleted, too.
350 * While it may not be obvious by looking at the function alone, the transient
351 * is deleted by Featured_Content::validate_settings().
352 *
353 * Hooks in the "delete_post_tag" action.
354 *
355 * @see Featured_Content::validate_settings().
356 *
357 * @param int $tag_id The term_id of the tag that has been deleted.
358 * @return void
359 */
360 public static function delete_post_tag( $tag_id ) {
361 $settings = self::get_setting();
362
363 if ( empty( $settings['tag-id'] ) || $tag_id != $settings['tag-id'] ) {
364 return;
365 }
366
367 $settings['tag-id'] = 0;
368 $settings = self::validate_settings( $settings );
369 update_option( 'featured-content', $settings );
370 }
371
372 /**
373 * Hide featured tag from displaying when global terms are queried from
374 * the front-end.
375 *
376 * Hooks into the "get_terms" filter.
377 *
378 * @uses Featured_Content::get_setting()
379 *
380 * @param array $terms A list of term objects. This is the return value of get_terms().
381 * @param array $taxonomies An array of taxonomy slugs.
382 * @return array $terms
383 */
384 public static function hide_featured_term( $terms, $taxonomies, $args ) {
385
386 // This filter is only appropriate on the front-end.
387 if ( is_admin() || ( defined( 'REST_REQUEST' ) && REST_REQUEST ) || ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) ) {
388 return $terms;
389 }
390
391 // We only want to hide the featured tag.
392 if ( ! in_array( 'post_tag', $taxonomies ) ) {
393 return $terms;
394 }
395
396 // Bail if no terms were returned.
397 if ( empty( $terms ) ) {
398 return $terms;
399 }
400
401 // Bail if term objects are unavailable.
402 if ( 'all' != $args['fields'] ) {
403 return $terms;
404 }
405
406 $settings = self::get_setting();
407
408 if ( false !== self::$tag ) {
409 foreach ( $terms as $order => $term ) {
410 if (
411 is_object( $term )
412 && (
413 $settings['tag-id'] === $term->term_id
414 || $settings['tag-name'] === $term->name
415 )
416 ) {
417 unset( $terms[ $order ] );
418 }
419 }
420 }
421
422 return $terms;
423 }
424
425 /**
426 * Hide featured tag from displaying when terms associated with a post object
427 * are queried from the front-end.
428 *
429 * Hooks into the "get_the_terms" filter.
430 *
431 * @uses Featured_Content::get_setting()
432 *
433 * @param array $terms A list of term objects. This is the return value of get_the_terms().
434 * @param int $id The ID field for the post object that terms are associated with.
435 * @param array $taxonomy An array of taxonomy slugs.
436 * @return array $terms
437 */
438 public static function hide_the_featured_term( $terms, $id, $taxonomy ) {
439
440 // This filter is only appropriate on the front-end.
441 if ( is_admin() ) {
442 return $terms;
443 }
444
445 // Make sure we are in the correct taxonomy.
446 if ( 'post_tag' != $taxonomy ) {
447 return $terms;
448 }
449
450 // No terms? Return early!
451 if ( empty( $terms ) ) {
452 return $terms;
453 }
454
455 $settings = self::get_setting();
456 $tag = get_term_by( 'name', $settings['tag-name'], 'post_tag' );
457
458 if ( false !== $tag ) {
459 foreach ( $terms as $order => $term ) {
460 if ( $settings['tag-id'] === $term->term_id || $settings['tag-name'] === $term->name ) {
461 unset( $terms[ $order ] );
462 }
463 }
464 }
465
466 return $terms;
467 }
468
469 /**
470 * Register custom setting on the Settings -> Reading screen.
471 *
472 * @uses Featured_Content::render_form()
473 * @uses Featured_Content::validate_settings()
474 *
475 * @return void
476 */
477 public static function register_setting() {
478 add_settings_field( 'featured-content', __( 'Featured Content', 'jetpack' ), array( __class__, 'render_form' ), 'reading' );
479
480 // Register sanitization callback for the Customizer.
481 register_setting( 'featured-content', 'featured-content', array( __class__, 'validate_settings' ) );
482 }
483
484 /**
485 * Add settings to the Customizer.
486 *
487 * @param WP_Customize_Manager $wp_customize Theme Customizer object.
488 */
489 public static function customize_register( $wp_customize ) {
490 $wp_customize->add_section(
491 'featured_content',
492 array(
493 'title' => esc_html__( 'Featured Content', 'jetpack' ),
494 'description' => sprintf( __( 'Easily feature all posts with the <a href="%1$s">"featured" tag</a> or a tag of your choice. Your theme supports up to %2$s posts in its featured content area.', 'jetpack' ), admin_url( '/edit.php?tag=featured' ), absint( self::$max_posts ) ),
495 'priority' => 130,
496 'theme_supports' => 'featured-content',
497 )
498 );
499
500 /*
501 Add Featured Content settings.
502 *
503 * Sanitization callback registered in Featured_Content::validate_settings().
504 * See http://themeshaper.com/2013/04/29/validation-sanitization-in-customizer/comment-page-1/#comment-12374
505 */
506 $wp_customize->add_setting(
507 'featured-content[tag-name]',
508 array(
509 'type' => 'option',
510 'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ),
511 )
512 );
513 $wp_customize->add_setting(
514 'featured-content[hide-tag]',
515 array(
516 'default' => true,
517 'type' => 'option',
518 'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ),
519 )
520 );
521 $wp_customize->add_setting(
522 'featured-content[show-all]',
523 array(
524 'default' => false,
525 'type' => 'option',
526 'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ),
527 )
528 );
529
530 // Add Featured Content controls.
531 $wp_customize->add_control(
532 'featured-content[tag-name]',
533 array(
534 'label' => esc_html__( 'Tag name', 'jetpack' ),
535 'section' => 'featured_content',
536 'theme_supports' => 'featured-content',
537 'priority' => 20,
538 )
539 );
540 $wp_customize->add_control(
541 'featured-content[hide-tag]',
542 array(
543 'label' => esc_html__( 'Do not display tag in post details and tag clouds.', 'jetpack' ),
544 'section' => 'featured_content',
545 'theme_supports' => 'featured-content',
546 'type' => 'checkbox',
547 'priority' => 30,
548 )
549 );
550 $wp_customize->add_control(
551 'featured-content[show-all]',
552 array(
553 'label' => esc_html__( 'Also display tagged posts outside the Featured Content area.', 'jetpack' ),
554 'section' => 'featured_content',
555 'theme_supports' => 'featured-content',
556 'type' => 'checkbox',
557 'priority' => 40,
558 )
559 );
560 }
561
562 /**
563 * Enqueue the tag suggestion script.
564 */
565 public static function enqueue_scripts() {
566 wp_enqueue_script( 'featured-content-suggest', plugins_url( 'js/suggest.js', __FILE__ ), array( 'suggest' ), '20131022', true );
567 }
568
569 /**
570 * Renders all form fields on the Settings -> Reading screen.
571 */
572 public static function render_form() {
573 printf( __( 'The settings for Featured Content have <a href="%s">moved to Appearance &rarr; Customize</a>.', 'jetpack' ), admin_url( 'customize.php?#accordion-section-featured_content' ) );
574 }
575
576 /**
577 * Get settings
578 *
579 * Get all settings recognized by this module. This function will return all
580 * settings whether or not they have been stored in the database yet. This
581 * ensures that all keys are available at all times.
582 *
583 * In the event that you only require one setting, you may pass its name as the
584 * first parameter to the function and only that value will be returned.
585 *
586 * @param string $key The key of a recognized setting.
587 * @return mixed Array of all settings by default. A single value if passed as first parameter.
588 */
589 public static function get_setting( $key = 'all' ) {
590 $saved = (array) get_option( 'featured-content' );
591
592 /**
593 * Filter Featured Content's default settings.
594 *
595 * @module theme-tools
596 *
597 * @since 2.7.0
598 *
599 * @param array $args {
600 * Array of Featured Content Settings
601 *
602 * @type int hide-tag Default is 1.
603 * @type int tag-id Default is 0.
604 * @type string tag-name Default is empty.
605 * @type int show-all Default is 0.
606 * }
607 */
608 $defaults = apply_filters(
609 'featured_content_default_settings',
610 array(
611 'hide-tag' => 1,
612 'tag-id' => 0,
613 'tag-name' => '',
614 'show-all' => 0,
615 )
616 );
617
618 $options = wp_parse_args( $saved, $defaults );
619 $options = array_intersect_key( $options, $defaults );
620
621 if ( 'all' != $key ) {
622 return isset( $options[ $key ] ) ? $options[ $key ] : false;
623 }
624
625 return $options;
626 }
627
628 /**
629 * Validate settings
630 *
631 * Make sure that all user supplied content is in an expected format before
632 * saving to the database. This function will also delete the transient set in
633 * Featured_Content::get_featured_content().
634 *
635 * @uses Featured_Content::delete_transient()
636 *
637 * @param array $input
638 * @return array $output
639 */
640 public static function validate_settings( $input ) {
641 $output = array();
642
643 if ( empty( $input['tag-name'] ) ) {
644 $output['tag-id'] = 0;
645 } else {
646 $term = get_term_by( 'name', $input['tag-name'], 'post_tag' );
647
648 if ( $term ) {
649 $output['tag-id'] = $term->term_id;
650 } else {
651 $new_tag = wp_create_tag( $input['tag-name'] );
652
653 if ( ! is_wp_error( $new_tag ) && isset( $new_tag['term_id'] ) ) {
654 $output['tag-id'] = $new_tag['term_id'];
655 }
656 }
657
658 $output['tag-name'] = $input['tag-name'];
659 }
660
661 $output['hide-tag'] = isset( $input['hide-tag'] ) && $input['hide-tag'] ? 1 : 0;
662
663 $output['show-all'] = isset( $input['show-all'] ) && $input['show-all'] ? 1 : 0;
664
665 self::delete_transient();
666
667 return $output;
668 }
669
670 /**
671 * Removes the quantity setting from the options array.
672 *
673 * @return void
674 */
675 public static function switch_theme() {
676 $option = (array) get_option( 'featured-content' );
677
678 if ( isset( $option['quantity'] ) ) {
679 unset( $option['quantity'] );
680 update_option( 'featured-content', $option );
681 }
682 }
683
684 public static function jetpack_update_featured_content_for_split_terms( $old_term_id, $new_term_id, $term_taxonomy_id, $taxonomy ) {
685 $featured_content_settings = get_option( 'featured-content', array() );
686
687 // Check to see whether the stored tag ID is the one that's just been split.
688 if ( isset( $featured_content_settings['tag-id'] ) && $old_term_id == $featured_content_settings['tag-id'] && 'post_tag' == $taxonomy ) {
689 // We have a match, so we swap out the old tag ID for the new one and resave the option.
690 $featured_content_settings['tag-id'] = $new_term_id;
691 update_option( 'featured-content', $featured_content_settings );
692 }
693 }
694 }
695
696 /**
697 * Adds the featured content plugin to the set of files for which action
698 * handlers should be copied when the theme context is loaded by the REST API.
699 *
700 * @param array $copy_dirs Copy paths with actions to be copied
701 * @return array Copy paths with featured content plugin
702 */
703 function wpcom_rest_api_featured_content_copy_plugin_actions( $copy_dirs ) {
704 $copy_dirs[] = __FILE__;
705 return $copy_dirs;
706 }
707 add_action( 'restapi_theme_action_copy_dirs', 'wpcom_rest_api_featured_content_copy_plugin_actions' );
708
709 /**
710 * Delayed initialization for API Requests.
711 */
712 function wpcom_rest_request_before_callbacks( $request ) {
713 Featured_Content::init();
714 return $request;
715 }
716
717 if ( Jetpack_Constants::is_true( 'IS_WPCOM' ) && Jetpack_Constants::is_true( 'REST_API_REQUEST' ) ) {
718 add_filter( 'rest_request_before_callbacks', 'wpcom_rest_request_before_callbacks');
719 }
720
721 Featured_Content::setup();
722 } // end if ( ! class_exists( 'Featured_Content' ) && isset( $GLOBALS['pagenow'] ) && 'plugins.php' !== $GLOBALS['pagenow'] ) {
723