source: filebird/trunk/includes/Classes/Review.php

<?php
namespace FileBird\Classes;

defined( 'ABSPATH' ) || exit;

class Review {
        public function __construct() {
                add_action( 'wp_ajax_fbv_save_review', array( $this, 'fbv_save_review' ) );

                $option = get_option( 'fbv_review', false );
                if ( time() >= intval( $option ) && '0' !== $option ) {
                        add_action( 'admin_notices', array( $this, 'give_review' ) );
                }
        }

        public function enqueue_scripts() {
                wp_enqueue_script( 'fbv-review', NJFB_PLUGIN_URL . 'assets/js/review.js', array( 'jquery' ), NJFB_VERSION, false );
        }

        public function checkNonce( $nonce ) {
                if ( ! wp_verify_nonce( $nonce, 'fbv_nonce' ) ) {
                        wp_send_json_error( array( 'status' => 'Wrong nonce validate!' ) );
                        exit();
                }
        }

        public function hasField( $field, $request ) {
                return isset( $request[ $field ] ) ? sanitize_text_field( $request[ $field ] ) : null;
        }

        public function fbv_save_review() {
                if ( ! current_user_can( 'manage_options' ) ) {
                        wp_send_json_error(
                                array( 'mess' => __( 'You do not have permission to perform this action.', 'filebird' ) ),
                                403
                        );
                }
                
                if ( count( $_REQUEST ) ) {
                        $nonce = $this->hasField( 'nonce', $_REQUEST );
                        $field = $this->hasField( 'field', $_REQUEST );

                        $this->checkNonce( $nonce );

                        if ( 'later' == $field ) {
                                update_option( 'fbv_review', time() + 5 * 60 * 60 * 24 ); //After 3 days show
                        } elseif ( 'alreadyDid' == $field || 'rateNow' == $field ) {
                                update_option( 'fbv_review', 0 );
                        }
                        wp_send_json_success();
                }
                wp_send_json_error( array( 'message' => 'Update fail!' ) );
        }

        public static function update_time_display() {
                $option = get_option( 'fbv_review', false );
                if ( '0' !== $option ) {
                        update_option( 'fbv_review', time() + 3 * 60 * 60 * 24 ); //After 3 days show
                }
        }

        public function give_review() {
                if ( function_exists( 'get_current_screen' ) ) {
                        if ( get_current_screen()->id == 'upload' || get_current_screen()->id == 'plugins' ) {
                                $this->enqueue_scripts();
                                ?>
<div class="notice notice-success is-dismissible filebird-notice" id="njt-FileBird-review">
    <h3><?php esc_html_e( 'Give FileBird a review', 'filebird' ); ?></h3>
    <p>
        <?php esc_html_e( 'Thank you for choosing FileBird. We hope you love it. Could you take a couple of seconds posting a nice review to share your happy experience?', 'filebird' ); ?>
    </p>
    <p>
        <?php esc_html_e( 'We will be forever grateful. Thank you in advance ;)', 'filebird' ); ?>
    </p>
    <p>
        <a href="javascript:;" data="rateNow"
            class="button button-primary"><?php esc_html_e( 'Rate now', 'filebird' ); ?></a>
        <a href="javascript:;" data="later" class="button"><?php esc_html_e( 'Later', 'filebird' ); ?></a>
        <a href="javascript:;" data="alreadyDid" class="button"><?php esc_html_e( 'No, thanks', 'filebird' ); ?></a>
    </p>
</div>
<?php
                        }
                }
        }
}