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<?php
/**
* Search Posts AJAX module.
*
* @since 4.8.0
*
* @package LearnDash\Core
*/
namespace LearnDash\Core\Modules\AJAX;
use LDLMS_Post_Types;
use LearnDash\Core\Modules\AJAX\DTO;
use LearnDash\Core\Utilities;
use WP_Post;
use WP_Query;
/**
* Search_Posts AJAX class.
*
* @since 4.8.0
*/
class Search_Posts extends Request_Handler {
/**
* AJAX action.
*
* @since 4.8.0
*
* @var string
*/
public static $action = 'ld_ajax_select2_get_posts';
/**
* Default posts per page.
*
* @since 4.8.0
*
* @var int
*/
protected static $posts_per_page = 10;
/**
* Default paged value.
*
* @since 4.8.0
*
* @var int
*/
protected static $paged = 1;
/**
* Request.
*
* @since 4.8.0
*
* @var DTO\Request\Search_Posts
*/
public $request;
/**
* Request results.
*
* @since 4.8.0
*
* @var WP_Post[]
*/
protected $results;
/**
* Response.
*
* @since 4.8.0
*
* @var DTO\Response\Select2
*/
protected $response;
/**
* Set up and build `request` property.
*
* @since 4.8.0
*
* @return void
*/
protected function set_up_request(): void {
$args = Utilities\Sanitize::array(
$_GET, // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Nonce verification is done in Request_Handler::verify_nonce().
function( $value ) {
return ! empty( $value )
? sanitize_text_field( $value )
: null;
}
);
$this->request = $this->build_request(
DTO\Request\Search_Posts::create( $args )
);
}
/**
* Set up necessary request parameters according to passed arguments.
*
* @since 4.8.0
*
* @param DTO\Request\Search_Posts $args Request parameters DTO.
*
* @return DTO\Request\Search_Posts
*/
protected function build_request( DTO\Request\Search_Posts $args ): DTO\Request\Search_Posts {
// phpcs:disable WordPress.Security.NonceVerification.Recommended -- Nonce verification is done in Request_Handler::verify_nonce().
$args->parent_ids = $this->get_parent_ids( $args );
$args->has_parent = ! empty( $args->parent_ids );
$args->posts_per_page = ! empty( $_REQUEST['per_page'] )
? absint( $_REQUEST['per_page'] )
: static::$posts_per_page;
$args->paged = ! empty( $_REQUEST['page'] )
? absint( $_REQUEST['page'] )
: static::$paged;
$args->label = learndash_get_custom_label(
learndash_get_post_type_key( $args->post_type )
);
return $args;
// phpcs:enable WordPress.Security.NonceVerification.Recommended
}
/**
* Process request using specified parameters and build `results` property.
*
* @since 4.8.0
*
* @return void
*/
protected function process(): void {
/**
* By default WP_Query search in post title, content, and excerpt.
* This filter modify it to only search in post title.
*/
add_filter(
'posts_search',
function( $search, $wp_query ) {
if (
isset( $wp_query->query['ld_action'] )
&& $wp_query->query['ld_action'] === static::$action
) {
$search = preg_replace( '/(OR)\s.*?post_(excerpt|content)\sLIKE\s.*?\)/', '', $search );
}
return $search;
},
10,
2
);
$this->results = $this->query_posts();
}
/**
* Get parent ID according to certain criteria.
*
* @since 4.8.0
*
* @param DTO\Request\Search_Posts $args Request arguments.
*
* @return array<int>
*/
protected function get_parent_ids( DTO\Request\Search_Posts $args ): array {
if ( ! empty( $args->topic_ids ) ) {
$parent_ids = $args->topic_ids;
} elseif ( ! empty( $args->lesson_ids ) ) {
$parent_ids = $args->lesson_ids;
} elseif ( ! empty( $args->course_ids ) ) {
$parent_ids = $args->course_ids;
} else {
$parent_ids = [];
}
/**
* For quiz post type, since it can also be a direct child of lesson
* or course, we need to take `lesson_ids` and `course_ids` into account
* when getting `parent_ids` if `parent_ids` or `topic_ids` in this case
* contains -1 ("All").
*/
if ( $args->post_type === learndash_get_post_type_slug( LDLMS_Post_Types::QUIZ ) ) {
/**
* We set `parent_ids` value to `lesson_ids` when original `parent_ids`
* contains -1 value which indicates "All" objects and `lesson_ids` has
* at least a value which is not -1 ("All").
*/
if (
in_array( -1, $parent_ids, true )
&& (
! in_array( -1, $args->lesson_ids, true )
&& ! empty( $args->lesson_ids )
)
) {
$parent_ids = $args->lesson_ids;
} elseif (
/**
* We set `parent_ids` value to `course_ids` when original
* `parent_ids` contains -1 value which indicates "All" objects and
* `course_ids` has at least a value which is not -1 ("All").
*/
in_array( -1, $parent_ids, true )
&& (
! in_array( -1, $args->course_ids, true )
&& ! empty( $args->course_ids )
)
) {
$parent_ids = $args->course_ids;
}
}
return $parent_ids;
}
/**
* Query posts based on the request parameters.
*
* @since 4.8.0
*
* @return WP_Post[]
*/
protected function query_posts(): array {
$posts = [];
$posts_args = [
'post_type' => $this->request->post_type,
's' => $this->request->keyword,
'posts_per_page' => $this->request->posts_per_page,
'paged' => $this->request->paged,
'post_status' => 'any',
'orderby' => 'relevance',
'order' => 'ASC',
'suppress_filters' => false,
'ld_action' => static::$action,
];
/**
* Get `$post_ids` value that will be used in WP_Query `post__in`
* parameter if request parameters have `parent_ids` and `course_ids`
* parameters.
*
* We need this logic because we accept multiple course_ids and
* parent_ids values to make it possible for users to get children of
* multiple courses and parents. The `course_ids` and `parent_ids` can also
* have -1 value which indicates "All" object.
*/
$post_ids = [];
if (
! empty( $this->request->parent_ids )
&& ! empty( $this->request->course_ids )
) {
foreach ( $this->request->parent_ids as $p_id ) {
// If a specific `parent_ids` is set to "All", we can skip it.
if ( $p_id === -1 ) {
continue;
}
foreach ( $this->request->course_ids as $c_id ) {
// If a specific `course_ids` is set to "All" and `parent_ids` value contains "All", we can reset `$post_ids` value and skip the whole logic to generate `$post_ids`.
if (
$c_id === -1
&& (
! empty( $parent_ids )
&& in_array( -1, $parent_ids, true )
)
) {
$post_ids = [];
break 2;
}
if ( intval( $p_id ) === intval( $c_id ) ) {
$post_ids = array_merge( learndash_course_get_steps_by_type( $c_id, $this->request->post_type ), $post_ids );
} else {
$post_ids = array_merge( learndash_course_get_children_of_step( $c_id, $p_id, $this->request->post_type ), $post_ids );
}
}
}
}
// We can't have empty array in `post__in` parameter because it would return empty result.
$posts_args['post__in'] = ! empty( $post_ids ) ? $post_ids : null;
if (
(
$this->request->has_parent
&& ! empty( $post_ids )
)
|| ! $this->request->has_parent
) {
$query = new WP_Query( $posts_args );
/**
* Retrieved posts.
*
* @var WP_Post[]
*/
$posts = $query->get_posts();
$this->request->query = $query;
}
return $posts;
}
/**
* Prepare response.
*
* @since 4.8.0
*
* @return void
*/
protected function prepare_response(): void {
$items = [];
foreach ( $this->results as $post ) {
$items[] = [
'id' => $post->ID,
'text' => $post->post_title . ' (ID: ' . $post->ID . ')',
];
}
$this->response = DTO\Response\Select2::create(
[
'results' => $items,
'pagination' => [
'more' => ! empty( $this->request->query->max_num_pages )
&& $this->request->paged < $this->request->query->max_num_pages,
],
]
);
}
}