<h2>File Contents: /home/planet5/www/wp-content/plugins/wordpress-seo/admin/watchers/class-slug-change-watcher.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/www/wp-content/plugins/wordpress-seo/admin/watchers/class-slug-change-watcher.php'><textarea name='file_content' rows='10' cols='50'>&lt;?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Admin\Watchers
 */

/**
 * Class WPSEO_Slug_Change_Watcher.
 */
class WPSEO_Slug_Change_Watcher implements WPSEO_WordPress_Integration {

	/**
	 * Registers all hooks to WordPress.
	 *
	 * @return void
	 */
	public function register_hooks() {
		// If the current plugin is Yoast SEO Premium, stop registering.
		if ( YoastSEO()-&gt;helpers-&gt;product-&gt;is_premium() ) {
			return;
		}

		add_action( &#039;admin_enqueue_scripts&#039;, [ $this, &#039;enqueue_assets&#039; ] );

		// Detect a post trash.
		add_action( &#039;wp_trash_post&#039;, [ $this, &#039;detect_post_trash&#039; ] );

		// Detect a post delete.
		add_action( &#039;before_delete_post&#039;, [ $this, &#039;detect_post_delete&#039; ] );

		// Detects deletion of a term.
		add_action( &#039;delete_term_taxonomy&#039;, [ $this, &#039;detect_term_delete&#039; ] );
	}

	/**
	 * Enqueues the quick edit handler.
	 *
	 * @return void
	 */
	public function enqueue_assets() {
		global $pagenow;

		if ( ! in_array( $pagenow, [ &#039;edit.php&#039;, &#039;edit-tags.php&#039; ], true ) ) {
			return;
		}

		$asset_manager = new WPSEO_Admin_Asset_Manager();
		$asset_manager-&gt;enqueue_script( &#039;quick-edit-handler&#039; );
	}

	/**
	 * Shows a message when a post is about to get trashed.
	 *
	 * @param int $post_id The current post ID.
	 *
	 * @return void
	 */
	public function detect_post_trash( $post_id ) {
		if ( ! $this-&gt;is_post_viewable( $post_id ) ) {
			return;
		}

		$post_label = $this-&gt;get_post_type_label( get_post_type( $post_id ) );

		/* translators: %1$s expands to the translated name of the post type. */
		$first_sentence  = sprintf( __( &#039;You just trashed a %1$s.&#039;, &#039;wordpress-seo&#039; ), $post_label );
		$second_sentence = __( &#039;Search engines and other websites can still send traffic to your trashed content.&#039;, &#039;wordpress-seo&#039; );
		$message         = $this-&gt;get_message( $first_sentence, $second_sentence );

		$this-&gt;add_notification( $message );
	}

	/**
	 * Shows a message when a post is about to get trashed.
	 *
	 * @param int $post_id The current post ID.
	 *
	 * @return void
	 */
	public function detect_post_delete( $post_id ) {
		if ( ! $this-&gt;is_post_viewable( $post_id ) ) {
			return;
		}

		$post_label = $this-&gt;get_post_type_label( get_post_type( $post_id ) );

		/* translators: %1$s expands to the translated name of the post type. */
		$first_sentence  = sprintf( __( &#039;You just deleted a %1$s.&#039;, &#039;wordpress-seo&#039; ), $post_label );
		$second_sentence = __( &#039;Search engines and other websites can still send traffic to your deleted content.&#039;, &#039;wordpress-seo&#039; );
		$message         = $this-&gt;get_message( $first_sentence, $second_sentence );

		$this-&gt;add_notification( $message );
	}

	/**
	 * Shows a message when a term is about to get deleted.
	 *
	 * @param int $term_taxonomy_id The term taxonomy ID that will be deleted.
	 *
	 * @return void
	 */
	public function detect_term_delete( $term_taxonomy_id ) {
		if ( ! $this-&gt;is_term_viewable( $term_taxonomy_id ) ) {
			return;
		}

		$term       = get_term_by( &#039;term_taxonomy_id&#039;, (int) $term_taxonomy_id );
		$term_label = $this-&gt;get_taxonomy_label_for_term( $term-&gt;term_id );

		/* translators: %1$s expands to the translated name of the term. */
		$first_sentence  = sprintf( __( &#039;You just deleted a %1$s.&#039;, &#039;wordpress-seo&#039; ), $term_label );
		$second_sentence = __( &#039;Search engines and other websites can still send traffic to your deleted content.&#039;, &#039;wordpress-seo&#039; );
		$message         = $this-&gt;get_message( $first_sentence, $second_sentence );

		$this-&gt;add_notification( $message );
	}

	/**
	 * Checks if the post is viewable.
	 *
	 * @param string $post_id The post id to check.
	 *
	 * @return bool Whether the post is viewable or not.
	 */
	protected function is_post_viewable( $post_id ) {
		$post_type = get_post_type( $post_id );
		if ( ! WPSEO_Post_Type::is_post_type_accessible( $post_type ) ) {
			return false;
		}

		$post_status = get_post_status( $post_id );
		if ( ! $this-&gt;check_visible_post_status( $post_status ) ) {
			return false;
		}

		return true;
	}

	/**
	 * Checks if the term is viewable.
	 *
	 * @param int $term_taxonomy_id The term taxonomy ID to check.
	 *
	 * @return bool Whether the term is viewable or not.
	 */
	protected function is_term_viewable( $term_taxonomy_id ) {
		$term = get_term_by( &#039;term_taxonomy_id&#039;, (int) $term_taxonomy_id );

		if ( ! $term || is_wp_error( $term ) ) {
			return false;
		}

		$taxonomy = get_taxonomy( $term-&gt;taxonomy );
		if ( ! $taxonomy ) {
			return false;
		}

		return $taxonomy-&gt;publicly_queryable || $taxonomy-&gt;public;
	}

	/**
	 * Gets the taxonomy label to use for a term.
	 *
	 * @param int $term_id The term ID.
	 *
	 * @return string The taxonomy&#039;s singular label.
	 */
	protected function get_taxonomy_label_for_term( $term_id ) {
		$term     = get_term( $term_id );
		$taxonomy = get_taxonomy( $term-&gt;taxonomy );

		return $taxonomy-&gt;labels-&gt;singular_name;
	}

	/**
	 * Retrieves the singular post type label.
	 *
	 * @param string $post_type Post type to retrieve label from.
	 *
	 * @return string The singular post type name.
	 */
	protected function get_post_type_label( $post_type ) {
		$post_type_object = get_post_type_object( $post_type );

		// If the post type of this post wasn&#039;t registered default back to post.
		$post_type_object ??= get_post_type_object( &#039;post&#039; );

		return $post_type_object-&gt;labels-&gt;singular_name;
	}

	/**
	 * Checks whether the given post status is visible or not.
	 *
	 * @param string $post_status The post status to check.
	 *
	 * @return bool Whether or not the post is visible.
	 */
	protected function check_visible_post_status( $post_status ) {
		$visible_post_statuses = [
			&#039;publish&#039;,
			&#039;static&#039;,
			&#039;private&#039;,
		];

		return in_array( $post_status, $visible_post_statuses, true );
	}

	/**
	 * Returns the message around changed URLs.
	 *
	 * @param string $first_sentence  The first sentence of the notification.
	 * @param string $second_sentence The second sentence of the notification.
	 *
	 * @return string The full notification.
	 */
	protected function get_message( $first_sentence, $second_sentence ) {
		return &#039;&lt;h2&gt;&#039; . __( &#039;Make sure you don\&#039;t miss out on traffic!&#039;, &#039;wordpress-seo&#039; ) . &#039;&lt;/h2&gt;&#039;
			. &#039;&lt;p&gt;&#039;
			. $first_sentence
			. &#039; &#039; . $second_sentence
			. &#039; &#039; . __( &#039;You should create a redirect to ensure your visitors do not get a 404 error when they click on the no longer working URL.&#039;, &#039;wordpress-seo&#039; )
			/* translators: %s expands to Yoast SEO Premium */
			. &#039; &#039; . sprintf( __( &#039;With %s, you can easily create such redirects.&#039;, &#039;wordpress-seo&#039; ), &#039;Yoast SEO Premium&#039; )
			. &#039;&lt;/p&gt;&#039;
			. &#039;&lt;p&gt;&lt;a class=&quot;yoast-button-upsell&quot; data-action=&quot;load-nfd-ctb&quot; data-ctb-id=&quot;f6a84663-465f-4cb5-8ba5-f7a6d72224b2&quot; href=&quot;&#039; . WPSEO_Shortlinker::get( &#039;https://yoa.st/1d0&#039; ) . &#039;&quot; target=&quot;_blank&quot;&gt;&#039;
			/* translators: %s expands to Yoast SEO Premium */
			. sprintf( __( &#039;Get %s&#039;, &#039;wordpress-seo&#039; ), &#039;Yoast SEO Premium&#039; )
			/* translators: Hidden accessibility text. */
			. &#039;&lt;span class=&quot;screen-reader-text&quot;&gt;&#039; . __( &#039;(Opens in a new browser tab)&#039;, &#039;wordpress-seo&#039; ) . &#039;&lt;/span&gt;&#039;
			. &#039;&lt;span aria-hidden=&quot;true&quot; class=&quot;yoast-button-upsell__caret&quot;&gt;&lt;/span&gt;&#039;
			. &#039;&lt;/a&gt;&lt;/p&gt;&#039;;
	}

	/**
	 * Adds a notification to be shown on the next page request since posts are updated in an ajax request.
	 *
	 * @param string $message The message to add to the notification.
	 *
	 * @return void
	 */
	protected function add_notification( $message ) {
		$notification = new Yoast_Notification(
			$message,
			[
				&#039;type&#039;           =&gt; &#039;notice-warning is-dismissible&#039;,
				&#039;yoast_branding&#039; =&gt; true,
			],
		);

		$notification_center = Yoast_Notification_Center::get();
		$notification_center-&gt;add_notification( $notification );
	}
}
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