woocommerce/includes/abstracts/abstract-wc-rest-posts-controller.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Abstract Rest Posts Controler Class
 *
 * @author   WooThemes
 * @category API
 * @package  WooCommerce/Abstracts
 * @version  2.6.0
 */
abstract class WC_REST_Posts_Controller extends WP_REST_Controller {

	/**
	 * Route base.
	 *
	 * @var string
	 */
	protected $rest_base = '';

	/**
	 * Post type.
	 *
	 * @var string
	 */
	protected $post_type = '';

	/**
	 * Controls visibility on frontend.
	 *
	 * @var string
	 */
	protected $public = false;

	/**
	 * Check if a given request has access to read a item.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return WP_Error|boolean
	 */
	public function get_item_permissions_check( $request ) {
		$post = get_post( (int) $request['id'] );

		if ( $post ) {
			$post_type = get_post_type_object( $this->post_type );
			return 'revision' !== $post->post_type && current_user_can( $post_type->cap->read_private_posts, $post->ID );
		}

		return true;
	}

	/**
	 * Check if a given request has access to read items.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return WP_Error|boolean
	 */
	public function get_items_permissions_check( $request ) {
		$post_type = get_post_type_object( $this->post_type );

		return current_user_can( $post_type->cap->read_private_posts );
	}

	/**
	 * Get a single item.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_Error|WP_REST_Response
	 */
	public function get_item( $request ) {
		$id   = (int) $request['id'];
		$post = get_post( $id );

		if ( empty( $id ) || empty( $post->ID ) || $this->post_type !== $post->post_type ) {
			return new WP_Error( sprintf( 'woocommerce_rest_api_invalid_%s_id', $this->post_type ), __( 'Invalid id.', 'woocommerce' ), array( 'status' => 404 ) );
		}

		$data = $this->prepare_item_for_response( $post, $request );
		$response = rest_ensure_response( $data );

		if ( $this->public ) {
			$response->link_header( 'alternate', get_permalink( $id ), array( 'type' => 'text/html' ) );
		}

		return $response;
	}

	/**
	 * Check the post_date_gmt or modified_gmt and prepare any post or
	 * modified date for single post output.
	 *
	 * @param string       $date_gmt
	 * @param string|null  $date
	 * @return string|null ISO8601/RFC3339 formatted datetime.
	 */
	protected function prepare_date_response( $date_gmt, $date = null ) {
		// Use the date if passed.
		if ( isset( $date ) ) {
			return mysql_to_rfc3339( $date );
		}
		// Return null if $date_gmt is empty/zeros.
		if ( '0000-00-00 00:00:00' === $date_gmt ) {
			return null;
		}
		// Return the formatted datetime.
		return mysql_to_rfc3339( $date_gmt );
	}
}