Sell any custom post type integrating with MarketPress. Requires MarketPress

wpmudev-cpt-mp-integration.php

<?php
/*
Plugin Name: CPT MarketPress integration
Plugin URI: https://premium.wpmudev.org/
Description: Sell any custom post type integrating with MarketPress. Requires MarketPress
Author: Panos Lyrakis @ WPMUDEV
Author URI: https://premium.wpmudev.org/
License: GPLv2 or later
*/

if( ! class_exists( 'WPMUDEV_CPT_MP_integration' ) ){
	class WPMUDEV_CPT_MP_integration
	{	
		private static $_instance = null;
		public static $post_type;

		public static function get_instance() {
	        if ( is_null( self::$_instance ) ) {
	            self::$_instance = new WPMUDEV_CPT_MP_integration();
	        }
	        return self::$_instance;
	    }
		
		private function __construct(){

			self::$post_type = apply_filters( 'WPMUDEV_CPT_MP_integration/post_type', 'book' );

			add_action( 'init', array( $this, 'create_cpt' ), 10 );
			add_action( 'add_meta_boxes_' . self::$post_type, array( $this, 'cpt_meta_boxes' ), 10 );
			
			add_action( 'save_post', array( $this, 'update_product' ), 10, 1 );
			add_filter( 'the_content', array( $this , 'add_to_cart'), 10 );

		}


		public function create_cpt(){

			$labels = apply_filters( 'WPMUDEV_CPT_MP_integration/cpt_label', array(
	                'name'               => _x( 'Books', 'Books post type general name', 'wpmudev-books' ),
	                'singular_name'      => _x( 'Book', 'Book Type post type singular name', 'wpmudev-mpi' ),
	                'add_new'            => _x( 'Add New', 'Book', 'wpmudev-mpi' ),
	                'add_new_item'       => __( 'Add New Book', 'wpmudev-mpi' ),
	                'edit_item'          => __( 'Edit Book', 'wpmudev-mpi' ),
	                'new_item'           => __( 'New Book', 'wpmudev-mpi' ),
	                'all_items'          => __( 'All Books', 'wpmudev-mpi' ),
	                'view_item'          => __( 'View Book', 'wpmudev-mpi' ),
	                'search_items'       => __( 'Search Books', 'wpmudev-mpi' ),
	                'not_found'          => __( 'No Books found', 'wpmudev-mpi' ),
	                'not_found_in_trash' => __( 'No Books found in the Trash', 'wpmudev-mpi' ),
	                'parent_item_colon'  => '',
	                'menu_name'          => __( 'Books' , 'wpmudev-mpi' )
	            ) 
            );

            $supports = apply_filters( 'WPMUDEV_CPT_MP_integration/cpt_supports', array(
	                'title', 'editor', 'thumbnail', 'excerpt'
	            )
            );

			$args = array(
                'labels'        => $labels,
                'description'   => __('Custom post type.', 'wpmudev-mpi'),
                'public'        => true,
                'menu_position' => 5,
                'supports'      => $supports,
                'has_archive'   => true,
                'hierarchical' => false,
                'taxonomies' => array('post_tag'),
                'menu_icon'=> 'dashicons-admin-page',
                'capability_type' => 'post'
            );

            register_post_type( self::$post_type, $args );

		}


		public function cpt_meta_boxes( $post ){

			add_meta_box(
		        'wpmudev-mpi-details-metabox',
		        '<div class="wpmudev-mpi-heading">' .__( 'Book Price', 'wpmudev-mpi' ).'</div>',
		        array( $this, 'cpt_price_metabox' ),
		        $post->post_type,
		        'normal',
		        'high'
			);

		}


		public function cpt_price_metabox( $post ){

			$price = (float)get_post_meta( $post->ID, 'price', true );
			wp_nonce_field( 'wpmudev_mpi_meta_box_nonce', 'mpi_meta_box_nonce' );
			?>
			<p>
				<label>Price:</label>
				<input type="number" step="0.1" name="price" value="<?php echo $price; ?>" /> $
			</p>
			<?php

		}


		public function update_product( $post_id ){

			if ( wp_is_post_revision( $post_id ) ){
				return;
			}

			$post = get_post( $post_id );

			if( empty( $post ) || $post->post_type != self::$post_type ){
				return;				
			}

			if( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
	        if( !isset( $_POST['mpi_meta_box_nonce'] ) || !wp_verify_nonce( $_POST['mpi_meta_box_nonce'], 'wpmudev_mpi_meta_box_nonce' ) ) return;
	        if( !current_user_can( 'edit_post', $post_id ) ) return;

	        global $wpdb;

			$price = (float)$_POST['price'];
			update_post_meta( $post_id, 'price', $price );

			if( ! class_exists( 'MP_Product' ) ){
				return;
			}

			$product_id = get_post_meta( $post_id, 'product_id', true );

			$product = array(
				'post_title' => $post->post_title,
				'post_content' => $post->post_content,
				'post_excerpt' => $post->post_excerpt,
				'post_type' => MP_Product::get_post_type(),
				'ping_status' => 'closed',
				'comment_status' => 'closed',
				'post_parent' => $post->ID,
				'post_status' => $post->post_status,
			);

			$formats = array( '%s', '%s', '%s', '%s', '%s', '%s', '%d', '%s', );

			if( empty( $product_id ) ){
				$product_id = wp_insert_post( $product );
				//Assign product id to book
				update_post_meta( $post_id, 'product_id', $product_id );

			}
			else{
				$product['ID'] = $product_id;
				wp_update_post( $product );

			}
			
			update_post_meta( $product_id, 'regular_price', $price );
			self::update_product_thumbnail( $product_id, $post->ID );

		}


		public static function update_product_thumbnail( $product_id, $book_id = 0 ) {
			$thumbnail_id = get_post_thumbnail_id( $product_id );
			if ( ! empty( $thumbnail_id ) ) {
				return;
			}
			/**
			 * Check is set cpt?
			 */
			if ( empty( $book_id ) ) {
				$book_id = wp_get_post_parent_id( $product_id );
			}
			if ( empty( $book_id ) ) {
				return;
			}

			/**
			 *  Only works if the cpt actually has a thumbnail.
			 */
			$thumbnail_url = get_post_meta( $book_id, 'cp_listing_image', true );
			if ( empty( $thumbnail_url ) ) {
				return;
			}
			/**
			 * Get thumbnail id from thumbnail_url, if it is custom image, do not
			 * set thumbnail for product.
			 */
			global $wpdb;
			$thumbnail_id = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE guid='%s';", $thumbnail_url ) );
			if ( empty( $thumbnail_id ) ) {
				return;
			}
			/**
			 * Finally ... set product thumbnail.
			 */
			set_post_thumbnail( $product_id, $thumbnail_id );
			$mp_product_images = explode( ',', get_post_meta( $product_id, 'mp_product_images', true ) );
			array_unshift( $mp_product_images, $thumbnail_id );
			$mp_product_images = implode( ',', array_filter( array_unique( $mp_product_images ) ) );
			update_post_meta( $product_id, 'mp_product_images', $mp_product_images );
		}


		public function add_to_cart( $content ){

			global $post;

			if( ! isset( $post->post_type ) || $post->post_type != self::$post_type ){
				return $content;
			}

			$product_id = get_post_meta( $post->ID, 'product_id', true );

			if( empty( $product_id ) ){
				return $content;
			}

			$shortcode = sprintf( '[mp_buy_button product_id="%s"]', $product_id );

			return $content . '<div class="wpmudev-mpi add_to_cart">' . do_shortcode( $shortcode ) . '</div>';

		}


	}

	add_action( 'plugins_loaded', function(){
		$GLOBALS['WPMUDEV_CPT_MP_integration'] = WPMUDEV_CPT_MP_integration::get_instance();
	}, 10 );

}