An attempt to integrate Landing Pages by Inbound Now with the Cornerstone Page Builder. Landing Pages stores field variation data in separate meta keys, usually in the following format: `key-name` for variation A, `key-name-1' for variation B, `key-name-2` for C, etc. Notice how A does not have an appended suffix. The challenge for these page bu…

inbound-cornerstone-builder.php

<?php
/*
Plugin Name: Inbound Extension - Cornerstone Builder
Plugin URI: http://www.inboundnow.com/
Description: Adds landing pages support to the cornerstone builder
Version: 1.0.8
Author: Inbound Now
Contributors: Hudson Atwell
Author URI: http://www.inboundnow.com/
*/


if (!class_exists('Inbound_CornerStone_Builder')) {


    class Inbound_CornerStone_Builder {

        static $map;
        static $settings;

        /**
         *  Initialize class
         */
        public function __construct() {
            self::define_constants();
            self::load_hooks();
        }


        /**
         *  Define constants
         */
        public static function define_constants() {
            define('INBOUND_CORNERSTONE_BUILDER_CURRENT_VERSION', '1.0.8');
            define('INBOUND_CORNERSTONE_BUILDER_LABEL', __('Cornerstone Builder Integration', 'inbound-pro'));
            define('INBOUND_CORNERSTONE_BUILDER_SLUG', 'inbound-cornerstone-builder');
            define('INBOUND_CORNERSTONE_BUILDER_FILE', __FILE__);
            define('INBOUND_CORNERSTONE_BUILDER_REMOTE_ITEM_NAME', 'cornerstone-page-builder-integration');
            define('INBOUND_CORNERSTONE_BUILDER_PATH', realpath(dirname(__FILE__)) . '/');
            $upload_dir = wp_upload_dir();
            $url = (!strstr(INBOUND_CORNERSTONE_BUILDER_PATH, 'plugins')) ? $upload_dir['baseurl'] . '/inbound-pro/extensions/' . plugin_basename(basename(__DIR__)) . '/' : WP_PLUGIN_URL . '/' . plugin_basename(dirname(__FILE__)) . '/';
            define('INBOUND_CORNERSTONE_BUILDER_URLPATH', $url);
            define('LANDING_PAGES_WPAUTOP', false);
        }

        /**
         * Load Hooks & Filters
         */
        public static function load_hooks() {

            add_filter( 'the_content' , array( __CLASS__ , 'readd_cornerstone_container' ) , 100 , 1  );
            add_action( 'cornerstone_after_save_content', array( __CLASS__ , 'lp_cornerstone_save_content' ), 1000 , 4 );
            add_filter( 'get_post_metadata', array( __CLASS__ , 'lp_cornerstone_load_content' ) , 100, 4 );
            add_action( 'admin_init' , array( __CLASS__ , 'lp_cornerstone_open_variation') , 1 );
            add_action( 'cornerstone_before_boot_app' , array( __CLASS__ , 'lp_cornerstone_add_variation_id_to_url' ) , 10  );
            add_action( 'cornerstone_before_load_preview' , array( __CLASS__ , 'load_correct_variation' ) , 10  );
            add_action( 'cs_before_preview_frame' , array( __CLASS__ , 'load_correct_variation' ) , 10  );

        }

        /**
         * loads the correct variation into the preview page
         */
        public static function load_correct_variation() {
            global $current_variation_id;
            $current_variation_id = $_COOKIE['cornerstone_loaded_variation'];

            //I had to pause building this feature. 
        }


        /**
         *
         */
        public static function lp_cornerstone_open_variation() {

            if (!isset($_GET['post']) ) {
                return;
            }

            $post_type = get_post_type($_GET['post']);

            if ($post_type != 'landing-page') {
                return;
            }

            $vid = (isset($_GET['lp-variation-id'])) ? $_GET['lp-variation-id'] : 0;

            setcookie('cornerstone_loaded_variation', $vid , time() + 3600, "/");

        }

        /**
         * @param $meta_value
         * @param $post_id
         * @param $meta_key
         * @param $single
         * @return mixed
         */
        public function lp_cornerstone_load_content($meta_value, $post_id, $meta_key, $single){


            if ( '_cornerstone_data' != $meta_key  ) {
                return $meta_value;
            }

            $post = get_post($post_id);

            if ($post->post_type!='landing-page') {
                return $meta_value;
            }

            remove_filter( 'get_post_metadata', array( __CLASS__ , 'lp_cornerstone_load_content') , 100 , 4);

            if (isset($_REQUEST['cs_preview_state'])) {
                $variation_id = ( isset($_COOKIE['cornerstone_loaded_variation']) && $_COOKIE['cornerstone_loaded_variation'] ) ? $_COOKIE['cornerstone_loaded_variation'] : 0;
            } else {
                $variation_id = Landing_Pages_Variations::get_current_variation_id();
            }

            $meta_value = get_post_meta( $post_id, '_cornerstone_data' , TRUE );

            $cornerstone_variation_data = get_post_meta( $post_id, '_cornerstone_data-'.$variation_id , TRUE );

            if ($cornerstone_variation_data) {
                //return $meta_value;
                return $cornerstone_variation_data;
            } else {
                return $meta_value;
            }
        }


        function lp_cornerstone_save_content( $post_id ) {

            $post = get_post($post_id);

            if ( $post->post_type !='landing-page' || wp_is_post_revision( $post_id ) ) {
                return;
            }

            if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE  ) {
                return;
            }

            $variation_id = ( isset($_COOKIE['cornerstone_loaded_variation']) && $_COOKIE['cornerstone_loaded_variation'] ) ? $_COOKIE['cornerstone_loaded_variation'] : 0;
            $post_content = $post->post_content;
            $cornerstone_data = get_post_meta( $post_id , '_cornerstone_data' ,true);

            if ( $variation_id > 0 ) {
                $content_key = 'content' . '-' . $variation_id;
            } else {
                $content_key = 'content';
            }


            update_post_meta( $post_id  , $content_key , $post_content );
            update_post_meta( $post_id  , '_cornerstone_data-' .$variation_id , addslashes($cornerstone_data) );

        }

        /**
         *
         */
        public static function lp_cornerstone_add_variation_id_to_url() {
            global $current_variation_id;

            $variation_id = (INT) $_COOKIE['cornerstone_loaded_variation'];

            $current_variation_id = $variation_id;
            return;
            ?>
            <script>
                var current_url = window.location.href.replace('/lp-variation-id=(.?*)/' , '');
                if (window.location.href.indexOf('/vid-<?php echo $current_variation_id; ?>') === -1 ) {
                    var split = window.location.href.split('#');
                    var pageUrl = split[0] + 'vid-<?php echo $current_variation_id; ?>/#' + split[1];
                    setTimeout(function() {
                        window.history.pushState('', '', pageUrl);
                    } , 400);
                }
            </script>
            <?php
        }

        /**
         * Add containers to content to support preview mode
         * @param $content
         * @return string
         */
        public static function readd_cornerstone_container($content) {
            global $post;

            if ($post->post_type != 'landing-page') {
                return $content;
            }

            if (!isset($_REQUEST['cs_preview_state'])) {
                return $content;
            }

            $variation_id = (INT) $_COOKIE['cornerstone_loaded_variation'];
            $notice = '<blockquote class="notice">You are editing landing page variation '.$variation_id.'</i>'.'<br>'.' <a href="'.get_edit_post_link($post->ID).'">Return to landing page edit screen</a></blockquote>';
            $content = '<div id="cs-content" class="cs-content"><div data-cs-zone="cs_content"></div></div>';

            return $content .  $notice;
        }
    }


    new Inbound_CornerStone_Builder();

}