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Edit File: CartAddItem.php

<?php
namespace Automattic\WooCommerce\StoreApi\Routes\V1;

use Automattic\WooCommerce\StoreApi\Exceptions\RouteException;

/**
 * CartAddItem class.
 */
class CartAddItem extends AbstractCartRoute {
	/**
	 * The route identifier.
	 *
	 * @var string
	 */
	const IDENTIFIER = 'cart-add-item';

/**
	 * Get the path of this REST route.
	 *
	 * @return string
	 */
	public function get_path() {
		return self::get_path_regex();
	}

/**
	 * Get the path of this rest route.
	 *
	 * @return string
	 */
	public static function get_path_regex() {
		return '/cart/add-item';
	}

/**
	 * Get method arguments for this REST route.
	 *
	 * @return array An array of endpoints.
	 */
	public function get_args() {
		return [
			[
				'methods'             => \WP_REST_Server::CREATABLE,
				'callback'            => [ $this, 'get_response' ],
				'permission_callback' => '__return_true',
				'args'                => [
					'id'        => [
						'description'       => __( 'The cart item product or variation ID.', 'woocommerce' ),
						'type'              => 'integer',
						'context'           => [ 'view', 'edit' ],
						'sanitize_callback' => 'absint',
					],
					'quantity'  => [
						'description' => __( 'Quantity of this item to add to the cart.', 'woocommerce' ),
						'type'        => 'number',
						'context'     => [ 'view', 'edit' ],
						'arg_options' => [
							'sanitize_callback' => 'wc_stock_amount',
						],
					],
					'variation' => [
						'description' => __( 'Chosen attributes (for variations).', 'woocommerce' ),
						'type'        => 'array',
						'context'     => [ 'view', 'edit' ],
						'items'       => [
							'type'       => 'object',
							'properties' => [
								'attribute' => [
									'description' => __( 'Variation attribute name.', 'woocommerce' ),
									'type'        => 'string',
									'context'     => [ 'view', 'edit' ],
								],
								'value'     => [
									'description' => __( 'Variation attribute value.', 'woocommerce' ),
									'type'        => 'string',
									'context'     => [ 'view', 'edit' ],
								],
							],
						],
					],
				],
			],
			'schema'      => [ $this->schema, 'get_public_item_schema' ],
			'allow_batch' => [ 'v1' => true ],
		];
	}

/**
	 * Handle the request and return a valid response for this endpoint.
	 *
	 * @throws RouteException On error.
	 * @param \WP_REST_Request $request Request object.
	 * @return \WP_REST_Response
	 */
	protected function get_route_post_response( \WP_REST_Request $request ) {
		// Do not allow key to be specified during creation.
		if ( ! empty( $request['key'] ) ) {
			throw new RouteException( 'woocommerce_rest_cart_item_exists', esc_html__( 'Cannot create an existing cart item.', 'woocommerce' ), 400 );
		}

/**
		 * Filters cart item data sent via the API before it is passed to the cart controller.
		 *
		 * This hook filters cart items. It allows the request data to be changed, for example, quantity, or
		 * supplemental cart item data, before it is passed into CartController::add_to_cart and stored to session.
		 *
		 * CartController::add_to_cart only expects the keys id, quantity, variation, and cart_item_data, so other values
		 * may be ignored. CartController::add_to_cart (and core) do already have a filter hook called
		 * woocommerce_add_cart_item, but this does not have access to the original Store API request like this hook does.
		 *
		 * @since 8.8.0
		 *
		 * @param array $add_to_cart_data An array of cart item data.
		 * @return array
		 */
		$add_to_cart_data = apply_filters(
			'woocommerce_store_api_add_to_cart_data',
			array(
				'id'             => $request['id'],
				'quantity'       => $request['quantity'],
				'variation'      => $request['variation'],
				'cart_item_data' => [],
			),
			$request
		);

$this->cart_controller->add_to_cart( $add_to_cart_data );

$response = rest_ensure_response( $this->schema->get_item_response( $this->cart_controller->get_cart_for_response() ) );
		$response->set_status( 201 );
		return $response;
	}
}

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