<?php
if ( defined( 'WPSCDISABLEDELETEBUTTON' ) ) {
	return;
}

/**
 * Adds "Delete Cache" button in WP Toolbar.
 */
function wpsc_admin_bar_render( $wp_admin_bar ) {

	if ( ! function_exists( 'current_user_can' ) || ! is_user_logged_in() ) {
		return false;
	}

	$path_to_home = rtrim( (string) parse_url( get_option( 'home' ), PHP_URL_PATH ), '/' );
	if ( ( is_singular() || is_archive() || is_front_page() || is_search() ) && current_user_can(  'delete_others_posts' ) ) {

		$site_regex = preg_quote( $path_to_home, '`' );
		$req_uri    = preg_replace( '/[ <>\'\"\r\n\t\(\)]/', '', $_SERVER[ 'REQUEST_URI' ] );
		$path       = preg_replace( '`^' . $site_regex . '`', '', $req_uri );

		$wp_admin_bar->add_menu( array(
					'parent' => '',
					'id' => 'delete-cache',
					'title' => __( 'Delete Cache', 'wp-super-cache' ),
					'meta' => array( 'title' => __( 'Delete cache of the current page', 'wp-super-cache' ) ),
					'href' => wp_nonce_url( admin_url( 'index.php?action=delcachepage&path=' . rawurlencode( $path ) ), 'delete-cache-' . $path . '_0', 'nonce' )
					) );
	}

	if ( is_admin() && ( wpsupercache_site_admin() || current_user_can( 'delete_others_posts' ) ) ) {
		$wp_admin_bar->add_menu( array(
					'parent' => '',
					'id' => 'delete-cache',
					'title' => __( 'Delete Cache', 'wp-super-cache' ),
					'meta' => array( 'title' => __( 'Delete Super Cache cached files', 'wp-super-cache' ) ),
					'href' => wp_nonce_url( admin_url( 'index.php?admin=1&action=delcachepage&path=' . rawurlencode( trailingslashit( $path_to_home ) ) ), 'delete-cache-' . trailingslashit( $path_to_home ) . '_1', 'nonce'  )
					) );
	}
}
add_action( 'admin_bar_menu', 'wpsc_admin_bar_render', 99 );

function wpsc_delete_cache_scripts() {
	if ( ! is_user_logged_in() ) {
		return;
	}

	if (
		is_plugin_active( 'amp/amp.php' ) ||
		( function_exists( 'ampforwp_is_amp_endpoint' ) && ampforwp_is_amp_endpoint() )
	) {
		wp_cache_debug( 'AMP detected. Not loading Delete Cache button JavaScript.' );
		return;
	}

	$path_to_home = rtrim( (string) parse_url( get_option( 'home' ), PHP_URL_PATH ), '/' );

	wp_enqueue_script( 'delete-cache-button', plugins_url( '/delete-cache-button.js', __FILE__ ), array('jquery'), '1.0', 1 );

	if ( ( is_singular() || is_archive() || is_front_page() || is_search() ) && current_user_can(  'delete_others_posts' ) ) {
		$site_regex   = preg_quote( $path_to_home, '`' );
		$req_uri      = preg_replace( '/[ <>\'\"\r\n\t\(\)]/', '', $_SERVER[ 'REQUEST_URI' ] );
		$path_to_home = preg_replace( '`^' . $site_regex . '`', '', $req_uri );
		$admin        = 0;
	} else {
		$admin = 1;
	}

	if ( $path_to_home === '' ) {
		$path_to_home = '/';
	}

	$nonce = wp_create_nonce( 'delete-cache-' . $path_to_home . '_' . $admin );
	wp_localize_script( 'delete-cache-button', 'wpsc_ajax', array( 'ajax_url' => admin_url( 'admin-ajax.php' ), 'path' => $path_to_home, 'admin' => $admin, 'nonce' => $nonce ) );
}
add_action( 'wp_ajax_ajax-delete-cache', 'wpsc_admin_bar_delete_cache_ajax' );
add_action( 'admin_enqueue_scripts', 'wpsc_delete_cache_scripts' );

/**
 * Delete cache for a specific page.
 */
function wpsc_admin_bar_delete_cache_ajax() {
	// response output
	header( "Content-Type: application/json" );
	if ( ! wpsc_delete_cache_directory() ) {
		if ( defined( 'WPSCDELETEERROR' ) ) {
			return json_decode( constant( 'WPSCDELETEERROR' ) );
		} else {
			return json_decode( false );
		}
	}
}

function wpsc_admin_bar_delete_cache() {
	$referer = wp_get_referer();

	if ( ! isset( $_GET['admin'] ) ) {
		$_GET['admin'] = 0;
	}

	foreach( array( 'path', 'nonce', 'admin' ) as $part ) {
		if ( isset( $_GET[ $part ] ) ) {
			$_POST[ $part ] = $_GET[ $part ];
		}
	}
	wpsc_delete_cache_directory();

	$req_path = isset( $_POST['path'] ) ? sanitize_text_field( stripslashes( $_POST['path'] ) ) : '';
	$valid_nonce = ( $req_path && isset( $_POST['nonce'] ) ) ? wp_verify_nonce( $_POST['nonce'], 'delete-cache-' . $_POST['path'] . '_' . $_POST['admin'] ) : false;

	if (
		$valid_nonce
		&& $referer
		&& $req_path
		&& (
			false !== stripos( $referer, $req_path )
			|| 0 === stripos( $referer, wp_login_url() )
		)
	) {
		/**
		 * Hook into the cache deletion process after a successful cache deletion from the admin bar button.
		 *
		 * @since 1.9
		 *
		 * @param string $req_path Path of the page where the cache flush was requested.
		 * @param string $referer  Referer URL.
		 */
		do_action( 'wpsc_after_delete_cache_admin_bar', $req_path, $referer );

		if ( $_POST['admin'] ) {
			wp_safe_redirect( $referer );
		} else {
			wp_safe_redirect( esc_url_raw( home_url( $req_path ) ) );
		}
		exit( 0 );
	} else {
		die( "Oops. Problem with nonce. Please delete cached page from settings page." );
	}
}

if ( 'delcachepage' === filter_input( INPUT_GET, 'action' ) ) {
	add_action( 'admin_init', 'wpsc_admin_bar_delete_cache' );
}

function wpsc_delete_cache_directory() {
	if ( ! current_user_can( 'delete_others_posts' ) ) {
		return false;
	}

	$req_path    = isset( $_POST['path'] ) ? sanitize_text_field( stripslashes( $_POST['path'] ) ) : '';
	$valid_nonce = ( $req_path && isset( $_POST['nonce'] ) ) ? wp_verify_nonce( $_POST['nonce'], 'delete-cache-' . $_POST['path'] . '_' . $_POST['admin'] ) : false;

	if ( ! $valid_nonce ) {
		wp_cache_debug( 'wpsc_delete_cache_directory: nonce was not valid' );
		return false;
	}

	$path = realpath( trailingslashit( get_supercache_dir() . str_replace( '..', '', preg_replace( '/:.*$/', '', $req_path ) ) ) );

	if ( $path ) {
		if ( isset( $_POST['admin'] ) && (int) $_POST['admin'] === 1 ) {
			global $file_prefix;
			wp_cache_debug( 'Cleaning cache for this site.' );
			wp_cache_clean_cache( $file_prefix );
			return;
		}
		$path           = trailingslashit( $path );
		$supercachepath = realpath( get_supercache_dir() );

		if ( false === wp_cache_confirm_delete( $path ) || ! str_starts_with( $path, $supercachepath ) ) {
			wp_cache_debug( 'Could not delete directory: ' . $path );
			define( 'WPSCDELETEERROR', 'Could not delete directory' );
			return false;
		}

		wp_cache_debug( 'Deleting cache files in directory: ' . $path );
		wpsc_delete_files( $path );
		return;
	} else {
		wp_cache_debug( 'wpsc_delete_cache_directory: Could not delete directory. It does not exist: ' . esc_attr( $_POST['path'] ) );
	}
}

• [F] boost.php
  Delete
• [F] delete-cache-button.js
  Delete
• [F] delete-cache-button.php
  Delete
• [F] preload-notification.php
  Delete