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Edit File: autoptimizeToolbar.php

<?php
/**
 * Handles toolbar-related stuff.
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

class autoptimizeToolbar
{
    public function __construct()
    {
        // If Cache is not available we don't add the toolbar.
        if ( ! autoptimizeCache::cacheavail() ) {
            return;
        }

// Load admin toolbar feature once WordPress, all plugins, and the theme are fully loaded and instantiated.
        if ( is_admin() ) {
            add_action( 'wp_loaded', array( $this, 'load_toolbar' ) );
        } else {
            // to avoid AMP complaining about the AMP conditional being checked too early.
            add_action( 'wp', array( $this, 'load_toolbar' ) );
        }
    }

public function load_toolbar()
    {
        // Check permissions and that toolbar is not hidden via filter.
        if ( current_user_can( 'manage_options' ) && apply_filters( 'autoptimize_filter_toolbar_show', true ) && ! autoptimizeMain::is_amp_markup( '' ) ) {

// Create a handler for the AJAX toolbar requests.
            add_action( 'wp_ajax_autoptimize_delete_cache', array( $this, 'delete_cache' ) );

// Load custom styles, scripts and menu only when needed.
            if ( is_admin_bar_showing() ) {
                if ( is_admin() ) {
                    add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
                } else {
                    add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
                }

// Add the Autoptimize Toolbar to the Admin bar.
                add_action( 'admin_bar_menu', array( $this, 'add_toolbar' ), 100 );
            }
        }
    }

public function add_toolbar()
    {
        global $wp_admin_bar;

// Retrieve the Autoptimize Cache Stats information.
        $stats = autoptimizeCache::stats();

// Set the Max Size recommended for cache files.
        $max_size = apply_filters( 'autoptimize_filter_cachecheck_maxsize', 512 * 1024 * 1024 );

// Retrieve the current Total Files in cache.
        $files = $stats[0];
        // Retrieve the current Total Size of the cache.
        $bytes = $stats[1];
        $size  = $this->format_filesize( $bytes );

// Calculate the percentage of cache used.
        $percentage = ceil( $bytes / $max_size * 100 );
        if ( $percentage > 100 ) {
            $percentage = 100;
        }

/**
         * We define the type of color indicator for the current state of cache size:
         * - "green" if the size is less than 80% of the total recommended.
         * - "orange" if over 80%.
         * - "red" if over 100%.
         */
        $color = ( 100 == $percentage ) ? 'red' : ( ( $percentage > 80 ) ? 'orange' : 'green' );

// Create or add new items into the Admin Toolbar.
        // Main "Autoptimize" node.
        $_my_name = apply_filters( 'autoptimize_filter_settings_is_pro', false ) ? __( 'Autoptimize Pro', 'autoptimize' ) : __( 'Autoptimize', 'autoptimize' );
        $wp_admin_bar->add_node(
            array(
                'id'    => 'autoptimize',
                'title' => '<span class="ab-icon"></span><span class="ab-label">' . $_my_name . '</span>',
                'href'  => admin_url( 'options-general.php?page=autoptimize' ),
                'meta'  => array( 'class' => 'bullet-' . $color ),
            )
        );

// "Cache Info" node.
        $wp_admin_bar->add_node(
            array(
                'id'     => 'autoptimize-cache-info',
                'title'  => '<p>' . __( 'CSS/ JS Cache Info', 'autoptimize' ) . '</p>' .
                            '<div class="autoptimize-radial-bar" percentage="' . $percentage . '">' .
                            '<div class="autoptimize-circle">' .
                            '<div class="mask full"><div class="fill bg-' . $color . '"></div></div>' .
                            '<div class="mask half"><div class="fill bg-' . $color . '"></div></div>' .
                            '<div class="shadow"></div>' .
                            '</div>' .
                            '<div class="inset"><div class="percentage"><div class="numbers ' . $color . '">' . $percentage . '%</div></div></div>' .
                            '</div>' .
                            '<table>' .
                            '<tr><td>' . __( 'Size', 'autoptimize' ) . ':</td><td class="size ' . $color . '">' . $size . '</td></tr>' .
                            '<tr><td>' . __( 'Files', 'autoptimize' ) . ':</td><td class="files white">' . $files . '</td></tr>' .
                            '</table>',
                'parent' => 'autoptimize',
            )
        );

// "Delete Cache" node.
        $wp_admin_bar->add_node(
            array(
                'id'     => 'autoptimize-delete-cache',
                'title'  => __( 'Clear CSS/ JS Cache', 'autoptimize' ),
                'parent' => 'autoptimize',
            )
        );
    }

public function delete_cache()
    {
        check_ajax_referer( 'ao_delcache_nonce', 'nonce' );

$result = false;
        if ( current_user_can( 'manage_options' ) ) {
            // We call the function for cleaning the Autoptimize cache.
            $result = autoptimizeCache::clearall();
        }

wp_send_json( $result );
    }

public function enqueue_scripts()
    {
        // Autoptimize Toolbar Styles.
        wp_enqueue_style( 'autoptimize-toolbar', plugins_url( '/static/toolbar.min.css', __FILE__ ), array(), AUTOPTIMIZE_PLUGIN_VERSION, 'all' );

// Autoptimize Toolbar Javascript.
        wp_enqueue_script( 'autoptimize-toolbar', plugins_url( '/static/toolbar.min.js', __FILE__ ), array( 'jquery' ), AUTOPTIMIZE_PLUGIN_VERSION, true );

// Localizes a registered script with data for a JavaScript variable.
        // Needed for the AJAX to work properly on the frontend.
        wp_localize_script(
            'autoptimize-toolbar',
            'autoptimize_ajax_object',
            array(
                'ajaxurl'     => admin_url( 'admin-ajax.php' ),
                // translators: links to the Autoptimize settings page.
                'error_msg'   => sprintf( __( 'Your Autoptimize cache might not have been purged successfully, please check on the <a href=%s>Autoptimize settings page</a>.', 'autoptimize' ), admin_url( 'options-general.php?page=autoptimize' ) . ' style="white-space:nowrap;"' ),
                'dismiss_msg' => __( 'Dismiss this notice.' ),
                'nonce'       => wp_create_nonce( 'ao_delcache_nonce' ),
            )
        );
    }

public function format_filesize( $bytes, $decimals = 2 )
    {
        $units = array( 'B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB' );

for ( $i = 0; ( $bytes / 1024) > 0.9; $i++, $bytes /= 1024 ) {} // @codingStandardsIgnoreLine

return sprintf( "%1.{$decimals}f %s", round( $bytes, $decimals ), $units[ $i ] );
    }
}

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