Sindbad~EG File Manager

<?php

add_action( 'wp_ajax_ninja_forms_sendwp_remote_install', 'wp_ajax_ninja_forms_sendwp_remote_install_handler' );

function wp_ajax_ninja_forms_sendwp_remote_install_handler () {
    $plugin_slug = 'sendwp';

    include_once ABSPATH . 'wp-admin/includes/plugin-install.php';
    include_once ABSPATH . 'wp-admin/includes/file.php';
    include_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
    
    /*
     * Use the WordPress Plugins API to get the plugin download link.
     */
    $api = plugins_api( 'plugin_information', array(
        'slug' => $plugin_slug,
    ) );
    if ( is_wp_error( $api ) ) {
        ob_end_clean();
        echo json_encode( array( 'error' => $api->get_error_message(), 'debug' => $api ) );
        exit;
    }
    
    /*
     * Use the AJAX Upgrader skin to quietly install the plugin.
     */
    $upgrader = new Plugin_Upgrader( new WP_Ajax_Upgrader_Skin() );
    $install = $upgrader->install( $api->download_link );
    if ( is_wp_error( $install ) ) {
        ob_end_clean();
        echo json_encode( array( 'error' => $install->get_error_message(), 'debug' => $api ) );
        exit;
    }
    
    /*
     * Activate the plugin based on the results of the upgrader.
     * @NOTE Assume this works, if the download works - otherwise there is a false positive if the plugin is already installed.
     */
    $activated = activate_plugin( $upgrader->plugin_info() );

    /*
     * Final check to see if SendWP is available.
     */
    if( ! function_exists('sendwp_get_server_url') ) {
        ob_end_clean();
        echo json_encode( array(
            'error' => __( 'Something went wrong. SendWP was not installed correctly.' ),
            'install' => $install,
            ) );
        exit;
    }
    
    echo json_encode( array(
        'partner_id' => 16,
        'register_url' => sendwp_get_server_url() . '_/signup',
        'client_name' => sendwp_get_client_name(),
        'client_secret' => sendwp_get_client_secret(),
        'client_redirect' => sendwp_get_client_redirect(),
    ) );
    exit;
}