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Editing: Pages.php

<?php

if (!defined('ABSPATH')) {
    die('No direct access.');
}

/**
 * Entry point for building the wordpress admin pages.
 * Temporarily extends the MetaSlider Class until more refactoring can be done.
 */
class MetaSlider_Admin_Pages extends MetaSliderPlugin
{

/**
     * The MetaSlider plugin class
     *
     * @var object $plugin
     */
    private $plugin;

/**
     * The current admin page
     *
     * @var string $current_page
     */
    private $current_page;

/**
     * Sets up the notices, security and loads assets for the admin page
     *
     * @param array $plugin Plugin details
     */
    public function __construct($plugin)
    {
        $this->plugin = $plugin;
        $this->notices = new MetaSlider_Notices($plugin);
        add_action('admin_enqueue_scripts', array($this, 'load_upgrade_page_assets'));
    }

/**
     * Loads in the overlay assets
     */
    public function load_overlay()
    {
        wp_enqueue_style('metaslider-colorbox-styles', METASLIDER_ADMIN_URL . 'assets/vendor/colorbox/colorbox.css', false, METASLIDER_ASSETS_VERSION);
        wp_enqueue_script('metaslider-colorbox', METASLIDER_ADMIN_URL . 'assets/vendor/colorbox/jquery.colorbox-min.js', array('jquery'), METASLIDER_ASSETS_VERSION, true);
    }

/**
     * Loads in tooltips
     */
    public function load_tooltips()
    {
        wp_enqueue_style('metaslider-tipsy-styles', METASLIDER_ADMIN_URL . 'assets/vendor/tipsy/tipsy.css', false, METASLIDER_ASSETS_VERSION);
        wp_enqueue_script('metaslider-tipsy', METASLIDER_ADMIN_URL . 'assets/vendor/tipsy/jquery.tipsy.js', array('jquery'), METASLIDER_ASSETS_VERSION, true);
    }

/**
     * Loads in custom javascript
     */
    public function load_javascript()
    {
        wp_enqueue_media();
        wp_enqueue_script('jquery-ui-core');
        wp_enqueue_script('jquery-ui-sortable');

wp_register_script('metaslider-admin-script', METASLIDER_ADMIN_URL . 'assets/dist/js/admin.js', array('jquery'), METASLIDER_ASSETS_VERSION, true);
        wp_localize_script('metaslider-admin-script', 'metaslider', array(
            'url' => __("URL", "ml-slider"),
            'caption' => __("Caption", "ml-slider"),
            'new_window' => __("New Window", "ml-slider"),
            'confirm' => __("Please confirm that you would like to delete this slideshow.", "ml-slider"),
            'restore_language' => __("Undo", "ml-slider"),
            'restored_language' => __("Slide restored", "ml-slider"),
            'deleted_language' => __("Slide deleted", "ml-slider"),
            'success_language' => __("Success", "ml-slider"),
            'copied_language' => __("Item was copied to your clipboard", "ml-slider"),
            'click_to_undo_language' => __("Press to undo", "ml-slider"),
            'ajaxurl' => admin_url('admin-ajax.php'),
            'update_image' => __("Select replacement image", "ml-slider"),
            'resize_nonce' => wp_create_nonce('metaslider_resize'),
            'create_slide_nonce' => wp_create_nonce('metaslider_create_slide'),
            'delete_slide_nonce' => wp_create_nonce('metaslider_delete_slide'),
            'undelete_slide_nonce' => wp_create_nonce('metaslider_undelete_slide'),
            'update_slide_image_nonce' => wp_create_nonce('metaslider_update_slide_image'),
            'useWithCaution' => __("Caution: This setting is for advanced developers only. If you're unsure, leave it checked.", "ml-slider")
        ));
        wp_enqueue_script('metaslider-admin-script');
        do_action('metaslider_register_admin_scripts');

// Register components and add support for the REST API / Admin AJAX
        do_action('metaslider_register_admin_components');
        $dev = defined('SCRIPT_DEBUG') && SCRIPT_DEBUG;
        wp_register_script('metaslider-admin-components', METASLIDER_ADMIN_URL . 'assets/dist/js/app' . ($dev ? '' : '.min') . '.js', array(), METASLIDER_ASSETS_VERSION, true);

// Check if rest is available
        $is_rest_enabled = $this->is_rest_enabled();

$extendify_path = defined('EXTENDIFY_PATH') ? basename(EXTENDIFY_PATH) . '/extendify.php' : 'extendify/extendify.php';

wp_localize_script('metaslider-admin-components', 'metaslider_api', array(
            'root' => $is_rest_enabled ? esc_url_raw(rest_url("metaslider/v1/")) : false,
            'nonce' => wp_create_nonce('wp_rest'),
            'ajaxurl' => admin_url('admin-ajax.php'),
            'proUser' => metaslider_pro_is_active(),
            'hoplink' => metaslider_get_upgrade_link(),
            'privacy_link' => metaslider_get_privacy_link(),
            'metaslider_admin_assets' => METASLIDER_ADMIN_ASSETS_URL,
            'metaslider_page' => admin_url('admin.php?page=metaslider'),
            'theme_editor_link' => admin_url('admin.php?page=metaslider-theme-editor'),
            'site_id' => get_current_blog_id(),
            'supports_rest' => $is_rest_enabled,
            'locale' => $this->gutenberg_get_jed_locale_data('ml-slider'),
            'default_locale' => $this->gutenberg_get_jed_locale_data('default'),
            'current_server_time' => current_time('mysql'),
            'extendify_plugin_active' => is_plugin_active($extendify_path),
            'deactivate_extendify_url' => wp_nonce_url('plugins.php?s=extendify&amp;plugin_status=all'),
        ));
        wp_enqueue_script('metaslider-admin-components');
    }

/**
     * Loads in custom styling for upgrade page
     */
    public function load_upgrade_page_assets()
    {
        if ('upgrade-metaslider' == $this->current_page) {
            wp_enqueue_style('metaslider-upgrade-styles', METASLIDER_ADMIN_URL . 'assets/css/upgrade.css', false, METASLIDER_ASSETS_VERSION);
        }
    }

/**
     * Loads in custom styling
     */
    public function load_styles()
    {
        wp_enqueue_style('metaslider-shepherd-css', METASLIDER_ADMIN_URL . 'assets/tether-shepherd/dist/css/shepherd-theme-arrows.css', false, METASLIDER_ASSETS_VERSION);
        wp_enqueue_style('metaslider-admin-styles', METASLIDER_ADMIN_URL . 'assets/dist/css/admin.css', false, METASLIDER_ASSETS_VERSION);

// Hook to load more styles and scripts (from pro)
        do_action('metaslider_register_admin_styles');
    }

/**
     * Area used to handle any third-party plugin conflicts
     */
    public function fix_conflicts()
    {
        // WP Posts Filter Fix (Advanced Settings not toggling)
        wp_dequeue_script('link');

// All In One Events Calendar Fix (Advanced Settings not toggling)
        wp_dequeue_script('ai1ec_requirejs');
    }

/**
     * Method to add pages
     *
     * @param string $title  - The title of the page
     * @param string $slug   - The slug used for the page
     * @param string $parent - Setting a parent will make this page a submenu item
     */
    public function add_page($title, $slug = '', $parent = '')
    {
        $slug = ('' == $slug) ? sanitize_title($title) : $slug;
        $method = 'render_'.str_replace("-", "_", $slug).'_page';
        if (!method_exists($this, $method)) {
            return false;
        }
        $this->current_page = $slug;
        $capability = apply_filters('metaslider_capability', 'edit_others_posts');

$dashboard_icon = 'data:image/svg+xml;base64,' . base64_encode(file_get_contents(dirname(__FILE__) . '/assets/metaslider.svg'));

$page = ('' == $parent) ? add_menu_page($title, $title, $capability, $slug, array($this, $method), $dashboard_icon) : add_submenu_page($parent, $title, $title, $capability, $slug, array($this, $method));

// Load assets on all pages
        add_action('load-' . $page, array($this, 'fix_conflicts'));
        add_action('load-' . $page, array($this, 'load_overlay'));
        add_action('load-' . $page, array($this, 'load_tooltips'));
        add_action('load-' . $page, array($this, 'load_javascript'));
        add_action('load-' . $page, array($this, 'load_styles'));
    }

/**
     * Sets up any logic needed for the main page
     * TODO continue refactoring from here
     */
    public function render_metaslider_page()
    {
        parent::render_admin_page();
    }

/**
     * Sets up any logic needed for the main page
     * TODO continue refactoring from here
     */
    public function render_metaslider_settings_page()
    {
        include METASLIDER_PATH."admin/views/pages/settings.php";
    }

/**
     * Sets up any logic needed for the upgrade page
     */
    public function render_upgrade_metaslider_page()
    {
        include METASLIDER_PATH."admin/views/pages/upgrade.php";
    }

/**
     * Backup function for Gutenberg's gutenberg_get_jed_locale_data
     *
     * @param string $domain - The text domain for the strings
     */
    private function gutenberg_get_jed_locale_data($domain)
    {
        if (function_exists('gutenberg_get_jed_locale_data')) {
            return gutenberg_get_jed_locale_data($domain);
        }

$translations = get_translations_for_domain($domain);
        $locale = array(
            '' => array(
                'domain' => $domain,
                'lang' => is_admin() && function_exists('get_user_locale') ? get_user_locale() : get_locale(),
            ),
        );

if (!empty($translations->headers['Plural-Forms'])) {
            $locale['']['plural_forms'] = $translations->headers['Plural-Forms'];
        }

foreach ($translations->entries as $msgid => $entry) {
            $locale[$msgid] = $entry->translations;
        }
        return $locale;
    }

/**
     * The main purpose of this is to try to detect that REST is *disabled*. That can be done in many ways, so the results will not be 100% successful in catching all possibilities.
     *
     * @return Boolean
     */
    private function is_rest_enabled()
    {

// Let users override
        if (defined('METASLIDER_FORCE_ADMIN_AJAX') && METASLIDER_FORCE_ADMIN_AJAX) {
            return false;
        }

// < WP 4.4
        if (!class_exists('WP_REST_Controller')) {
            return false;
        }

// A pre-WP 4.7 filter (deprecated in 4.7)
        if (!(bool) apply_filters('rest_enabled', true)) {
            return false;
        }

// Some plugins remove this
        if (!has_action('init', 'rest_api_init')) {
            return false;
        }

// Disable via blanking the URL
        if (function_exists('get_rest_url') && class_exists('WP_Rewrite')) {
            global $wp_rewrite;
            if (empty($wp_rewrite)) {
                $wp_rewrite = new WP_Rewrite();
            }
            if ('' == get_rest_url()) {
                return false;
            }
        }

// Disable via removing from the <head> output, and non-default permalinks which mean that a default guess will not work
        if (false === has_action('wp_head', 'rest_output_link_wp_head')) {
            $permalink_structure = get_option('permalink_structure');
            if (!$permalink_structure || false !== strpos($permalink_structure, 'index.php')) {
                return false;
            }
        }

// Plugins which, when active, disable REST. Do not add a plugin which merely has an *option* to disable REST. (For that, we will need further logic, to detect the option setting).
        $plugins = array(
            'disable-permanently-rest-api' => 'Disable Permanently REST API',
        );

$slugs = array_keys($plugins);

$active_plugins = get_option('active_plugins');
        if (!is_array($active_plugins)) {
            $active_plugins = array();
        }
        if (is_multisite()) {
            $active_plugins = array_merge($active_plugins, array_keys(get_site_option('active_sitewide_plugins', array())));
        }

// Loops around each plugin available.
        foreach ($active_plugins as $value) {
            if (!preg_match('#^([^/]+)/#', $value, $matches)) {
                continue;
            }
            if (in_array($matches[1], $slugs)) {
                return false;
            }
        }

return true;
    }
}

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