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<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Admin
 */

/**
 * Class WPSEO_Meta_Columns.
 */
class WPSEO_Meta_Columns {

/**
	 * Holds the SEO analysis.
	 *
	 * @var WPSEO_Metabox_Analysis_SEO
	 */
	private $analysis_seo;

/**
	 * Holds the readability analysis.
	 *
	 * @var WPSEO_Metabox_Analysis_Readability
	 */
	private $analysis_readability;

/**
	 * When page analysis is enabled, just initialize the hooks.
	 */
	public function __construct() {
		if ( apply_filters( 'wpseo_use_page_analysis', true ) === true ) {
			add_action( 'admin_init', [ $this, 'setup_hooks' ] );
		}

$this->analysis_seo         = new WPSEO_Metabox_Analysis_SEO();
		$this->analysis_readability = new WPSEO_Metabox_Analysis_Readability();
	}

/**
	 * Sets up up the hooks.
	 */
	public function setup_hooks() {
		$this->set_post_type_hooks();

if ( $this->analysis_seo->is_enabled() ) {
			add_action( 'restrict_manage_posts', [ $this, 'posts_filter_dropdown' ] );
		}

if ( $this->analysis_readability->is_enabled() ) {
			add_action( 'restrict_manage_posts', [ $this, 'posts_filter_dropdown_readability' ] );
		}

add_filter( 'request', [ $this, 'column_sort_orderby' ] );
	}

/**
	 * Adds the column headings for the SEO plugin for edit posts / pages overview.
	 *
	 * @param array $columns Already existing columns.
	 *
	 * @return array Array containing the column headings.
	 */
	public function column_heading( $columns ) {
		if ( $this->display_metabox() === false ) {
			return $columns;
		}

$added_columns = [];

if ( $this->analysis_seo->is_enabled() ) {
			$added_columns['wpseo-score'] = '<span class="yoast-tooltip yoast-tooltip-n yoast-tooltip-alt" data-label="' . esc_attr__( 'SEO score', 'wordpress-seo' ) . '"><span class="yoast-column-seo-score yoast-column-header-has-tooltip"><span class="screen-reader-text">' . __( 'SEO score', 'wordpress-seo' ) . '</span></span></span>';
		}

if ( $this->analysis_readability->is_enabled() ) {
			$added_columns['wpseo-score-readability'] = '<span class="yoast-tooltip yoast-tooltip-n yoast-tooltip-alt" data-label="' . esc_attr__( 'Readability score', 'wordpress-seo' ) . '"><span class="yoast-column-readability yoast-column-header-has-tooltip"><span class="screen-reader-text">' . __( 'Readability score', 'wordpress-seo' ) . '</span></span></span>';
		}

$added_columns['wpseo-title']    = __( 'SEO Title', 'wordpress-seo' );
		$added_columns['wpseo-metadesc'] = __( 'Meta Desc.', 'wordpress-seo' );

if ( $this->analysis_seo->is_enabled() ) {
			$added_columns['wpseo-focuskw'] = __( 'Keyphrase', 'wordpress-seo' );
		}

return array_merge( $columns, $added_columns );
	}

/**
	 * Displays the column content for the given column.
	 *
	 * @param string $column_name Column to display the content for.
	 * @param int    $post_id     Post to display the column content for.
	 */
	public function column_content( $column_name, $post_id ) {
		if ( $this->display_metabox() === false ) {
			return;
		}

switch ( $column_name ) {
			case 'wpseo-score':
				// @phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Correctly escaped in render_score_indicator() method.
				echo $this->parse_column_score( $post_id );
				return;

case 'wpseo-score-readability':
				// @phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Correctly escaped in render_score_indicator() method.
				echo $this->parse_column_score_readability( $post_id );
				return;

case 'wpseo-title':
				$post  = get_post( $post_id, ARRAY_A );
				$title = wpseo_replace_vars( $this->page_title( $post_id ), $post );
				$title = apply_filters( 'wpseo_title', $title );

echo esc_html( $title );
				return;

case 'wpseo-metadesc':
				$post         = get_post( $post_id, ARRAY_A );
				$metadesc_val = wpseo_replace_vars( WPSEO_Meta::get_value( 'metadesc', $post_id ), $post );
				$metadesc_val = apply_filters( 'wpseo_metadesc', $metadesc_val );

if ( $metadesc_val === '' ) {
					echo '<span aria-hidden="true">&#8212;</span><span class="screen-reader-text">',
						esc_html__( 'Meta description not set.', 'wordpress-seo' ),
						'</span>';
					return;
				}

echo esc_html( $metadesc_val );
				return;

case 'wpseo-focuskw':
				$focuskw_val = WPSEO_Meta::get_value( 'focuskw', $post_id );

if ( $focuskw_val === '' ) {
					echo '<span aria-hidden="true">&#8212;</span><span class="screen-reader-text">',
						esc_html__( 'Focus keyphrase not set.', 'wordpress-seo' ),
						'</span>';
					return;
				}

echo esc_html( $focuskw_val );
				return;
		}
	}

/**
	 * Indicates which of the SEO columns are sortable.
	 *
	 * @param array $columns Appended with their orderby variable.
	 *
	 * @return array Array containing the sortable columns.
	 */
	public function column_sort( $columns ) {
		if ( $this->display_metabox() === false ) {
			return $columns;
		}

$columns['wpseo-metadesc'] = 'wpseo-metadesc';

if ( $this->analysis_seo->is_enabled() ) {
			$columns['wpseo-focuskw'] = 'wpseo-focuskw';
		}

return $columns;
	}

/**
	 * Hides the SEO title, meta description and focus keyword columns if the user hasn't chosen which columns to hide.
	 *
	 * @param array|false $result The hidden columns.
	 * @param string      $option The option name used to set which columns should be hidden.
	 * @param WP_User     $user   The User.
	 *
	 * @return array      $result Array containing the columns to hide.
	 */
	public function column_hidden( $result, $option, $user ) {
		global $wpdb;

if ( $user->has_prop( $wpdb->get_blog_prefix() . $option ) || $user->has_prop( $option ) ) {
			return $result;
		}

if ( ! is_array( $result ) ) {
			$result = [];
		}

array_push( $result, 'wpseo-title', 'wpseo-metadesc' );

if ( $this->analysis_seo->is_enabled() ) {
			array_push( $result, 'wpseo-focuskw' );
		}

return $result;
	}

/**
	 * Adds a dropdown that allows filtering on the posts SEO Quality.
	 */
	public function posts_filter_dropdown() {
		if ( ! $this->can_display_filter() ) {
			return;
		}

$ranks = WPSEO_Rank::get_all_ranks();

echo '<label class="screen-reader-text" for="wpseo-filter">' . esc_html__( 'Filter by SEO Score', 'wordpress-seo' ) . '</label>';
		echo '<select name="seo_filter" id="wpseo-filter">';

echo $this->generate_option( '', __( 'All SEO Scores', 'wordpress-seo' ) );

foreach ( $ranks as $rank ) {
			$selected = selected( $this->get_current_seo_filter(), $rank->get_rank(), false );

echo $this->generate_option( $rank->get_rank(), $rank->get_drop_down_label(), $selected );
		}

echo '</select>';
	}

/**
	 * Adds a dropdown that allows filtering on the posts Readability Quality.
	 *
	 * @return void
	 */
	public function posts_filter_dropdown_readability() {
		if ( ! $this->can_display_filter() ) {
			return;
		}

$ranks = WPSEO_Rank::get_all_readability_ranks();

echo '<label class="screen-reader-text" for="wpseo-readability-filter">' . esc_html__( 'Filter by Readability Score', 'wordpress-seo' ) . '</label>';
		echo '<select name="readability_filter" id="wpseo-readability-filter">';

echo $this->generate_option( '', __( 'All Readability Scores', 'wordpress-seo' ) );

foreach ( $ranks as $rank ) {
			$selected = selected( $this->get_current_readability_filter(), $rank->get_rank(), false );

echo $this->generate_option( $rank->get_rank(), $rank->get_drop_down_readability_labels(), $selected );
		}

echo '</select>';
	}

/**
	 * Generates an <option> element.
	 *
	 * @param string $value    The option's value.
	 * @param string $label    The option's label.
	 * @param string $selected HTML selected attribute for an option.
	 *
	 * @return string The generated <option> element.
	 */
	protected function generate_option( $value, $label, $selected = '' ) {
		return '<option ' . $selected . ' value="' . esc_attr( $value ) . '">' . esc_html( $label ) . '</option>';
	}

/**
	 * Determines the SEO score filter to be later used in the meta query, based on the passed SEO filter.
	 *
	 * @param string $seo_filter The SEO filter to use to determine what further filter to apply.
	 *
	 * @return array The SEO score filter.
	 */
	protected function determine_seo_filters( $seo_filter ) {
		if ( $seo_filter === WPSEO_Rank::NO_FOCUS ) {
			return $this->create_no_focus_keyword_filter();
		}

if ( $seo_filter === WPSEO_Rank::NO_INDEX ) {
			return $this->create_no_index_filter();
		}

$rank = new WPSEO_Rank( $seo_filter );

return $this->create_seo_score_filter( $rank->get_starting_score(), $rank->get_end_score() );
	}

/**
	 * Determines the Readability score filter to the meta query, based on the passed Readability filter.
	 *
	 * @param string $readability_filter The Readability filter to use to determine what further filter to apply.
	 *
	 * @return array The Readability score filter.
	 */
	protected function determine_readability_filters( $readability_filter ) {
		$rank = new WPSEO_Rank( $readability_filter );

return $this->create_readability_score_filter( $rank->get_starting_score(), $rank->get_end_score() );
	}

/**
	 * Creates a keyword filter for the meta query, based on the passed Keyword filter.
	 *
	 * @param string $keyword_filter The keyword filter to use.
	 *
	 * @return array The keyword filter.
	 */
	protected function get_keyword_filter( $keyword_filter ) {
		return [
			'post_type' => get_query_var( 'post_type', 'post' ),
			'key'       => WPSEO_Meta::$meta_prefix . 'focuskw',
			'value'     => sanitize_text_field( $keyword_filter ),
		];
	}

/**
	 * Determines whether the passed filter is considered to be valid.
	 *
	 * @param mixed $filter The filter to check against.
	 *
	 * @return bool Whether or not the filter is considered valid.
	 */
	protected function is_valid_filter( $filter ) {
		return ! empty( $filter ) && is_string( $filter );
	}

/**
	 * Collects the filters and merges them into a single array.
	 *
	 * @return array Array containing all the applicable filters.
	 */
	protected function collect_filters() {
		$active_filters = [];

$seo_filter             = $this->get_current_seo_filter();
		$readability_filter     = $this->get_current_readability_filter();
		$current_keyword_filter = $this->get_current_keyword_filter();

if ( $this->is_valid_filter( $seo_filter ) ) {
			$active_filters = array_merge(
				$active_filters,
				$this->determine_seo_filters( $seo_filter )
			);
		}

if ( $this->is_valid_filter( $readability_filter ) ) {
			$active_filters = array_merge(
				$active_filters,
				$this->determine_readability_filters( $readability_filter )
			);
		}

if ( $this->is_valid_filter( $current_keyword_filter ) ) {
			$active_filters = array_merge(
				$active_filters,
				$this->get_keyword_filter( $current_keyword_filter )
			);
		}

return $active_filters;
	}

/**
	 * Modify the query based on the filters that are being passed.
	 *
	 * @param array $vars Query variables that need to be modified based on the filters.
	 *
	 * @return array Array containing the meta query to use for filtering the posts overview.
	 */
	public function column_sort_orderby( $vars ) {
		$collected_filters = $this->collect_filters();

if ( isset( $vars['orderby'] ) ) {
			$vars = array_merge( $vars, $this->filter_order_by( $vars['orderby'] ) );
		}

return $this->build_filter_query( $vars, $collected_filters );
	}

/**
	 * Retrieves the meta robots query values to be used within the meta query.
	 *
	 * @return array Array containing the query parameters regarding meta robots.
	 */
	protected function get_meta_robots_query_values() {
		return [
			'relation' => 'OR',
			[
				'key'     => WPSEO_Meta::$meta_prefix . 'meta-robots-noindex',
				'compare' => 'NOT EXISTS',
			],
			[
				'key'     => WPSEO_Meta::$meta_prefix . 'meta-robots-noindex',
				'value'   => '1',
				'compare' => '!=',
			],
		];
	}

/**
	 * Determines the score filters to be used. If more than one is passed, it created an AND statement for the query.
	 *
	 * @param array $score_filters Array containing the score filters.
	 *
	 * @return array Array containing the score filters that need to be applied to the meta query.
	 */
	protected function determine_score_filters( $score_filters ) {
		if ( count( $score_filters ) > 1 ) {
			return array_merge( [ 'relation' => 'AND' ], $score_filters );
		}

return $score_filters;
	}

/**
	 * Retrieves the post type from the $_GET variable.
	 *
	 * @return string The current post type.
	 */
	public function get_current_post_type() {
		return filter_input( INPUT_GET, 'post_type' );
	}

/**
	 * Retrieves the SEO filter from the $_GET variable.
	 *
	 * @return string The current post type.
	 */
	public function get_current_seo_filter() {
		return filter_input( INPUT_GET, 'seo_filter' );
	}

/**
	 * Retrieves the Readability filter from the $_GET variable.
	 *
	 * @return string The current post type.
	 */
	public function get_current_readability_filter() {
		return filter_input( INPUT_GET, 'readability_filter' );
	}

/**
	 * Retrieves the keyword filter from the $_GET variable.
	 *
	 * @return string The current post type.
	 */
	public function get_current_keyword_filter() {
		return filter_input( INPUT_GET, 'seo_kw_filter' );
	}

/**
	 * Uses the vars to create a complete filter query that can later be executed to filter out posts.
	 *
	 * @param array $vars    Array containing the variables that will be used in the meta query.
	 * @param array $filters Array containing the filters that we need to apply in the meta query.
	 *
	 * @return array Array containing the complete filter query.
	 */
	protected function build_filter_query( $vars, $filters ) {
		// If no filters were applied, just return everything.
		if ( count( $filters ) === 0 ) {
			return $vars;
		}

$result               = [ 'meta_query' => [] ];
		$result['meta_query'] = array_merge( $result['meta_query'], [ $this->determine_score_filters( $filters ) ] );

$current_seo_filter = $this->get_current_seo_filter();

// This only applies for the SEO score filter because it can because the SEO score can be altered by the no-index option.
		if ( $this->is_valid_filter( $current_seo_filter ) && ! in_array( $current_seo_filter, [ WPSEO_Rank::NO_INDEX, WPSEO_Rank::NO_FOCUS ], true ) ) {
			$result['meta_query'] = array_merge( $result['meta_query'], [ $this->get_meta_robots_query_values() ] );
		}

return array_merge( $vars, $result );
	}

/**
	 * Creates a Readability score filter.
	 *
	 * @param number $low  The lower boundary of the score.
	 * @param number $high The higher boundary of the score.
	 *
	 * @return array The Readability Score filter.
	 */
	protected function create_readability_score_filter( $low, $high ) {
		return [
			[
				'key'     => WPSEO_Meta::$meta_prefix . 'content_score',
				'value'   => [ $low, $high ],
				'type'    => 'numeric',
				'compare' => 'BETWEEN',
			],
		];
	}

/**
	 * Creates an SEO score filter.
	 *
	 * @param number $low  The lower boundary of the score.
	 * @param number $high The higher boundary of the score.
	 *
	 * @return array The SEO score filter.
	 */
	protected function create_seo_score_filter( $low, $high ) {
		return [
			[
				'key'     => WPSEO_Meta::$meta_prefix . 'linkdex',
				'value'   => [ $low, $high ],
				'type'    => 'numeric',
				'compare' => 'BETWEEN',
			],
		];
	}

/**
	 * Creates a filter to retrieve posts that were set to no-index.
	 *
	 * @return array Array containin the no-index filter.
	 */
	protected function create_no_index_filter() {
		return [
			[
				'key'     => WPSEO_Meta::$meta_prefix . 'meta-robots-noindex',
				'value'   => '1',
				'compare' => '=',
			],
		];
	}

/**
	 * Creates a filter to retrieve posts that have no keyword set.
	 *
	 * @return array Array containing the no focus keyword filter.
	 */
	protected function create_no_focus_keyword_filter() {
		return [
			[
				'key'     => WPSEO_Meta::$meta_prefix . 'meta-robots-noindex',
				'value'   => 'needs-a-value-anyway',
				'compare' => 'NOT EXISTS',
			],
			[
				'key'     => WPSEO_Meta::$meta_prefix . 'linkdex',
				'value'   => 'needs-a-value-anyway',
				'compare' => 'NOT EXISTS',
			],
		];
	}

/**
	 * Determines whether a particular post_id is of an indexable post type.
	 *
	 * @param string $post_id The post ID to check.
	 *
	 * @return bool Whether or not it is indexable.
	 */
	protected function is_indexable( $post_id ) {
		if ( ! empty( $post_id ) && ! $this->uses_default_indexing( $post_id ) ) {
			return WPSEO_Meta::get_value( 'meta-robots-noindex', $post_id ) === '2';
		}

$post = get_post( $post_id );

if ( is_object( $post ) ) {
			// If the option is false, this means we want to index it.
			return WPSEO_Options::get( 'noindex-' . $post->post_type, false ) === false;
		}

return true;
	}

/**
	 * Determines whether the given post ID uses the default indexing settings.
	 *
	 * @param integer $post_id The post ID to check.
	 *
	 * @return bool Whether or not the default indexing is being used for the post.
	 */
	protected function uses_default_indexing( $post_id ) {
		return WPSEO_Meta::get_value( 'meta-robots-noindex', $post_id ) === '0';
	}

/**
	 * Returns filters when $order_by is matched in the if-statement.
	 *
	 * @param string $order_by The ID of the column by which to order the posts.
	 *
	 * @return array Array containing the order filters.
	 */
	private function filter_order_by( $order_by ) {
		switch ( $order_by ) {
			case 'wpseo-metadesc':
				return [
					'meta_key' => WPSEO_Meta::$meta_prefix . 'metadesc',
					'orderby'  => 'meta_value',
				];

case 'wpseo-focuskw':
				return [
					'meta_key' => WPSEO_Meta::$meta_prefix . 'focuskw',
					'orderby'  => 'meta_value',
				];
		}

return [];
	}

/**
	 * Parses the score column.
	 *
	 * @param integer $post_id The ID of the post for which to show the score.
	 *
	 * @return string The HTML for the SEO score indicator.
	 */
	private function parse_column_score( $post_id ) {
		if ( ! $this->is_indexable( $post_id ) ) {
			$rank  = new WPSEO_Rank( WPSEO_Rank::NO_INDEX );
			$title = __( 'Post is set to noindex.', 'wordpress-seo' );

WPSEO_Meta::set_value( 'linkdex', 0, $post_id );

return $this->render_score_indicator( $rank, $title );
		}

if ( WPSEO_Meta::get_value( 'focuskw', $post_id ) === '' ) {
			$rank  = new WPSEO_Rank( WPSEO_Rank::NO_FOCUS );
			$title = __( 'Focus keyphrase not set.', 'wordpress-seo' );

return $this->render_score_indicator( $rank, $title );
		}

$score = (int) WPSEO_Meta::get_value( 'linkdex', $post_id );
		$rank  = WPSEO_Rank::from_numeric_score( $score );
		$title = $rank->get_label();

return $this->render_score_indicator( $rank, $title );
	}

/**
	 * Parsing the readability score column.
	 *
	 * @param int $post_id The ID of the post for which to show the readability score.
	 *
	 * @return string The HTML for the readability score indicator.
	 */
	private function parse_column_score_readability( $post_id ) {
		$score = (int) WPSEO_Meta::get_value( 'content_score', $post_id );
		$rank  = WPSEO_Rank::from_numeric_score( $score );

return $this->render_score_indicator( $rank );
	}

/**
	 * Sets up the hooks for the post_types.
	 */
	private function set_post_type_hooks() {
		$post_types = WPSEO_Post_Type::get_accessible_post_types();

if ( ! is_array( $post_types ) || $post_types === [] ) {
			return;
		}

foreach ( $post_types as $post_type ) {
			if ( $this->display_metabox( $post_type ) === false ) {
				continue;
			}

add_filter( 'manage_' . $post_type . '_posts_columns', [ $this, 'column_heading' ], 10, 1 );
			add_action( 'manage_' . $post_type . '_posts_custom_column', [ $this, 'column_content' ], 10, 2 );
			add_action( 'manage_edit-' . $post_type . '_sortable_columns', [ $this, 'column_sort' ], 10, 2 );

/*
			 * Use the `get_user_option_{$option}` filter to change the output of the get_user_option
			 * function for the `manage{$screen}columnshidden` option, which is based on the current
			 * admin screen. The admin screen we want to target is the `edit-{$post_type}` screen.
			 */
			$filter = sprintf( 'get_user_option_%s', sprintf( 'manage%scolumnshidden', 'edit-' . $post_type ) );

add_filter( $filter, [ $this, 'column_hidden' ], 10, 3 );
		}

unset( $post_type );
	}

/**
	 * Wraps the WPSEO_Metabox check to determine whether the metabox should be displayed either by
	 * choice of the admin or because the post type is not a public post type.
	 *
	 * @since 7.0
	 *
	 * @param string $post_type Optional. The post type to test, defaults to the current post post_type.
	 *
	 * @return bool Whether or not the meta box (and associated columns etc) should be hidden.
	 */
	private function display_metabox( $post_type = null ) {
		$current_post_type = sanitize_text_field( $this->get_current_post_type() );

if ( ! isset( $post_type ) && ! empty( $current_post_type ) ) {
			$post_type = $current_post_type;
		}

return WPSEO_Utils::is_metabox_active( $post_type, 'post_type' );
	}

/**
	 * Retrieve the page title.
	 *
	 * @param int $post_id Post to retrieve the title for.
	 *
	 * @return string
	 */
	private function page_title( $post_id ) {
		$fixed_title = WPSEO_Meta::get_value( 'title', $post_id );
		if ( $fixed_title !== '' ) {
			return $fixed_title;
		}

$post = get_post( $post_id );

if ( is_object( $post ) && WPSEO_Options::get( 'title-' . $post->post_type, '' ) !== '' ) {
			$title_template = WPSEO_Options::get( 'title-' . $post->post_type );
			$title_template = str_replace( ' %%page%% ', ' ', $title_template );

return wpseo_replace_vars( $title_template, $post );
		}

return wpseo_replace_vars( '%%title%%', $post );
	}

/**
	 * Renders the score indicator.
	 *
	 * @param WPSEO_Rank $rank  The rank this indicator should have.
	 * @param string     $title Optional. The title for this rank, defaults to the title of the rank.
	 *
	 * @return string The HTML for a score indicator.
	 */
	private function render_score_indicator( $rank, $title = '' ) {
		if ( empty( $title ) ) {
			$title = $rank->get_label();
		}

return '<div aria-hidden="true" title="' . esc_attr( $title ) . '" class="' . esc_attr( 'wpseo-score-icon ' . $rank->get_css_class() ) . '"></div><span class="screen-reader-text wpseo-score-text">' . esc_html( $title ) . '</span>';
	}

/**
	 * Determines whether or not filter dropdowns should be displayed.
	 *
	 * @return bool Whether or the current page can display the filter drop downs.
	 */
	public function can_display_filter() {
		if ( $GLOBALS['pagenow'] === 'upload.php' ) {
			return false;
		}

if ( $this->display_metabox() === false ) {
			return false;
		}

$screen = get_current_screen();
		if ( $screen === null ) {
			return false;
		}

return WPSEO_Post_Type::is_post_type_accessible( $screen->post_type );
	}
}

Editing: class-meta-columns.php

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