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✏️ Editing: WPDeveloper_Core_Installer.php

<?php
namespace Essential_Addons_Elementor\Classes;

if (!defined('ABSPATH')) {
    exit;
} // Exit if accessed directly.

/**
 * WPDeveloper Core Install
 */
class WPDeveloper_Core_Installer {
    /**
     * Plugin Base Name
     *
     * @var string
     */
    private $plugin_basename;
    /**
     * Instantiate the class
     *
     * @param string $affiliate
     */
    function __construct( $plugin_basename = '' ) {
        $this->plugin_basename = $plugin_basename;
        add_action( 'init', array( $this, 'init_hooks' ) );
    }
    /**
     * Initialize the hooks
     *
     * @return void
     */
    public function init_hooks() {
        if ( ! current_user_can( 'manage_options' ) ) {
            return;
        }
        add_action( 'wp_ajax_wpdeveloper_upsale_core_install_' . $this->plugin_basename, array( $this, 'core_install' ) );
    }
    /**
     * Fail if plugin installtion/activation fails
     *
     * @param  Object $thing
     *
     * @return void
     */
    public function fail_on_error( $thing ) {
        if ( is_wp_error( $thing ) ) {
            wp_send_json_error( $thing->get_error_message() );
        }
    }

/**
     * Install Upsale Plugin
     *
     * @return void
     */
    public function core_install() {
        check_ajax_referer( 'wpdeveloper_upsale_core_install_' . $this->plugin_basename );

if ( ! current_user_can( 'manage_options' ) ) {
            wp_send_json_error( __( 'You don\'t have permission to install the plugins', 'essential-addons-for-elementor-lite' ) );
        }

$plugin_slug = ( isset( $_POST['slug'] ) ) ? sanitize_text_field( wp_unslash( $_POST['slug'] ) ) : '';
        $plugin_file = ( isset( $_POST['file'] ) ) ? sanitize_text_field( wp_unslash( $_POST['file'] ) ) : '';

if( empty( $plugin_file ) || empty( $plugin_slug ) ) {
            wp_send_json_error( __( 'You don\'t have set any slug and file name to install the plugins', 'essential-addons-for-elementor-lite' ) );
        }

$plugin_status = $this->install_plugin( $plugin_slug, $plugin_file );
        $this->fail_on_error( $plugin_status );

wp_send_json_success();
    }
    /**
     * Install and activate a plugin
     *
     * @param  string $slug
     * @param  string $file
     *
     * @return WP_Error|null
     */
    public function install_plugin( $slug, $file ) {
        include_once ABSPATH . 'wp-admin/includes/plugin-install.php';
        include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';

$plugin_basename = $slug . '/' . $file;

// if exists and not activated
        if ( file_exists( WP_PLUGIN_DIR . '/' . $plugin_basename ) ) {
            return activate_plugin( $plugin_basename );
        }

// seems like the plugin doesn't exists. Download and activate it
        $upgrader = new \Plugin_Upgrader( new \WP_Ajax_Upgrader_Skin() );

$api      = plugins_api( 'plugin_information', array( 'slug' => $slug, 'fields' => array( 'sections' => false ) ) );
        $result   = $upgrader->install( $api->download_link );

if ( is_wp_error( $result ) ) {
            return $result;
        }

return activate_plugin( $plugin_basename );
    }
}