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Filename : class-wpel-plugin.php
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<?php

/**
 * Class WPEL_Plugin
 *
 * @package  WPEL
 * @category WordPress Plugin
 * @version  2.3
 * @link     https://www.webfactoryltd.com/
 * @license  Dual licensed under the MIT and GPLv2+ licenses
 */
final class WPEL_Plugin extends FWP_Plugin_Base_1x0x0
{

    /**
     * Initialize plugin
     * @param string $plugin_file
     * @param string $plugin_dir
     */
    protected function init($plugin_file, $plugin_dir)
    {
        parent::init($plugin_file, $plugin_dir);
        $this->create_components();
        add_action('wp_ajax_wpel_dismiss_notice', array($this, 'ajax_dismiss_notice'));
    }

    /**
     * Dismiss notice via AJAX call
     *
     * @return null
     */
    function ajax_dismiss_notice()
    {
      check_ajax_referer('wpel_dismiss_notice');

      if (!current_user_can('administrator')) {
        wp_send_json_error('You are not allowed to run this action.');
      }

      if(!isset($_GET['notice_name'])){
        wp_send_json_error('Unknown action.');
      }

      $notice_name = sanitize_text_field(wp_unslash($_GET['notice_name']));
      $pointers = get_option('wpel-pointers', array());

      if ($notice_name != 'welcome') {
        wp_send_json_error('Unknown notice');
      } else {
        $pointers['hide_welcome_pointer'] = true;
        update_option('wpel-pointers', $pointers);
        wp_send_json_success();
      }
    } // ajax_dismiss_notice


    /**
     * Create components
     */
    protected function create_components()
    {
        WPEL_Register_Scripts::create();

        // network admin page
        $network_page = WPEL_Network_Page::create(array(
            'network-settings'          => WPEL_Network_Fields::create(),
            'network-admin-settings'    => WPEL_Network_Admin_Fields::create(),
        ));

        // admin settings page
        $settings_page = WPEL_Settings_Page::create($network_page, array(
            'external-links'    => WPEL_External_Link_Fields::create(),
            'internal-links'    => WPEL_Internal_Link_Fields::create(),
            'excluded-links'    => WPEL_Excluded_Link_Fields::create(),
            'admin'             => WPEL_Admin_Fields::create(),
            'exceptions'        => WPEL_Exceptions_Fields::create(),
            'exit-confirmation' => WPEL_Exit_Confirmation_Fields::create(),
        ));

        // front site
        if (!is_admin()) {
            WPEL_Front::create($settings_page);
        }

        // update procedures
        WPEL_Update::create();
    }

    static function wp_kses_wf($html)
    {
        if(empty($html)){
            echo '';
            return;
        }
        
        add_filter('safe_style_css', function ($styles) {
            $styles_wf = array(
                'text-align',
                'margin',
                'color',
                'float',
                'border',
                'background',
                'background-color',
                'border-bottom',
                'border-bottom-color',
                'border-bottom-style',
                'border-bottom-width',
                'border-collapse',
                'border-color',
                'border-left',
                'border-left-color',
                'border-left-style',
                'border-left-width',
                'border-right',
                'border-right-color',
                'border-right-style',
                'border-right-width',
                'border-spacing',
                'border-style',
                'border-top',
                'border-top-color',
                'border-top-style',
                'border-top-width',
                'border-width',
                'caption-side',
                'clear',
                'cursor',
                'direction',
                'font',
                'font-family',
                'font-size',
                'font-style',
                'font-variant',
                'font-weight',
                'height',
                'letter-spacing',
                'line-height',
                'margin-bottom',
                'margin-left',
                'margin-right',
                'margin-top',
                'overflow',
                'padding',
                'padding-bottom',
                'padding-left',
                'padding-right',
                'padding-top',
                'text-decoration',
                'text-indent',
                'vertical-align',
                'width',
                'display',
            );

            foreach ($styles_wf as $style_wf) {
                $styles[] = $style_wf;
            }
            return $styles;
        });

        $allowed_tags = wp_kses_allowed_html('post');
        $allowed_tags['input'] = array(
            'type' => true,
            'style' => true,
            'class' => true,
            'id' => true,
            'checked' => true,
            'disabled' => true,
            'name' => true,
            'size' => true,
            'placeholder' => true,
            'value' => true,
            'data-*' => true,
            'size' => true,
            'disabled' => true
        );

        $allowed_tags['textarea'] = array(
            'type' => true,
            'style' => true,
            'class' => true,
            'id' => true,
            'checked' => true,
            'disabled' => true,
            'name' => true,
            'size' => true,
            'placeholder' => true,
            'value' => true,
            'data-*' => true,
            'cols' => true,
            'rows' => true,
            'disabled' => true,
            'autocomplete' => true
        );

        $allowed_tags['select'] = array(
            'type' => true,
            'style' => true,
            'class' => true,
            'id' => true,
            'checked' => true,
            'disabled' => true,
            'name' => true,
            'size' => true,
            'placeholder' => true,
            'value' => true,
            'data-*' => true,
            'multiple' => true,
            'disabled' => true
        );

        $allowed_tags['option'] = array(
            'type' => true,
            'style' => true,
            'class' => true,
            'id' => true,
            'checked' => true,
            'disabled' => true,
            'name' => true,
            'size' => true,
            'placeholder' => true,
            'value' => true,
            'selected' => true,
            'data-*' => true
        );
        $allowed_tags['optgroup'] = array(
            'type' => true,
            'style' => true,
            'class' => true,
            'id' => true,
            'checked' => true,
            'disabled' => true,
            'name' => true,
            'size' => true,
            'placeholder' => true,
            'value' => true,
            'selected' => true,
            'data-*' => true,
            'label' => true
        );

        $allowed_tags['a'] = array(
            'href' => true,
            'data-*' => true,
            'class' => true,
            'style' => true,
            'id' => true,
            'target' => true,
            'data-*' => true,
            'role' => true,
            'aria-controls' => true,
            'aria-selected' => true,
            'disabled' => true
        );

        $allowed_tags['div'] = array(
            'style' => true,
            'class' => true,
            'id' => true,
            'data-*' => true,
            'role' => true,
            'aria-labelledby' => true,
            'value' => true,
            'aria-modal' => true,
            'tabindex' => true
        );

        $allowed_tags['li'] = array(
            'style' => true,
            'class' => true,
            'id' => true,
            'data-*' => true,
            'role' => true,
            'aria-labelledby' => true,
            'value' => true,
            'aria-modal' => true,
            'tabindex' => true
        );

        $allowed_tags['span'] = array(
            'style' => true,
            'class' => true,
            'id' => true,
            'data-*' => true,
            'aria-hidden' => true
        );

        $allowed_tags['style'] = array(
            'class' => true,
            'id' => true,
            'type' => true
        );

        $allowed_tags['fieldset'] = array(
            'class' => true,
            'id' => true,
            'type' => true
        );

        $allowed_tags['link'] = array(
            'class' => true,
            'id' => true,
            'type' => true,
            'rel' => true,
            'href' => true,
            'media' => true
        );

        $allowed_tags['form'] = array(
            'style' => true,
            'class' => true,
            'id' => true,
            'method' => true,
            'action' => true,
            'data-*' => true
        );

        $allowed_tags['script'] = array(
            'class' => true,
            'id' => true,
            'type' => true,
            'src' => true
        );

        echo wp_kses($html, $allowed_tags);

        add_filter('safe_style_css', function ($styles) {
            $styles_wf = array(
                'text-align',
                'margin',
                'color',
                'float',
                'border',
                'background',
                'background-color',
                'border-bottom',
                'border-bottom-color',
                'border-bottom-style',
                'border-bottom-width',
                'border-collapse',
                'border-color',
                'border-left',
                'border-left-color',
                'border-left-style',
                'border-left-width',
                'border-right',
                'border-right-color',
                'border-right-style',
                'border-right-width',
                'border-spacing',
                'border-style',
                'border-top',
                'border-top-color',
                'border-top-style',
                'border-top-width',
                'border-width',
                'caption-side',
                'clear',
                'cursor',
                'direction',
                'font',
                'font-family',
                'font-size',
                'font-style',
                'font-variant',
                'font-weight',
                'height',
                'letter-spacing',
                'line-height',
                'margin-bottom',
                'margin-left',
                'margin-right',
                'margin-top',
                'overflow',
                'padding',
                'padding-bottom',
                'padding-left',
                'padding-right',
                'padding-top',
                'text-decoration',
                'text-indent',
                'vertical-align',
                'width'
            );

            foreach ($styles_wf as $style_wf) {
                if (($key = array_search($style_wf, $styles)) !== false) {
                    unset($styles[$key]);
                }
            }
            return $styles;
        });
    }
}