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/**
 * REST API WCCOM Site Installer Controller Class.
 *
 * @extends WC_REST_Controller
 */
class WC_REST_WCCOM_Site_Installer_Controller extends WC_REST_Controller {

/**
	 * Endpoint namespace.
	 *
	 * @var string
	 */
	protected $namespace = 'wccom-site/v1';

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

/**
	 * Register the routes for product reviews.
	 *
	 * @since 3.7.0
	 */
	public function register_routes() {
		register_rest_route(
			$this->namespace,
			'/' . $this->rest_base,
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_install_state' ),
					'permission_callback' => array( $this, 'check_permission' ),
				),
				array(
					'methods'             => WP_REST_Server::CREATABLE,
					'callback'            => array( $this, 'install' ),
					'permission_callback' => array( $this, 'check_permission' ),
					'args'                => array(
						'products' => array(
							'required' => true,
							'type'     => 'object',
						),
					),
				),
				array(
					'methods'             => WP_REST_Server::DELETABLE,
					'callback'            => array( $this, 'reset_install' ),
					'permission_callback' => array( $this, 'check_permission' ),
				),
			)
		);
	}

/**
	 * Check permissions.
	 *
	 * @since 3.7.0
	 * @param WP_REST_Request $request Full details about the request.
	 * @return bool|WP_Error
	 */
	public function check_permission( $request ) {
		$current_user = wp_get_current_user();

if ( empty( $current_user ) || ( $current_user instanceof WP_User && ! $current_user->exists() ) ) {
			return apply_filters(
				WC_WCCOM_Site::AUTH_ERROR_FILTER_NAME,
				new WP_Error(
					WC_REST_WCCOM_Site_Installer_Errors::NOT_AUTHENTICATED_CODE,
					WC_REST_WCCOM_Site_Installer_Errors::NOT_AUTHENTICATED_MESSAGE,
					array( 'status' => WC_REST_WCCOM_Site_Installer_Errors::NOT_AUTHENTICATED_HTTP_CODE )
				)
			);
		}

if ( ! user_can( $current_user, 'install_plugins' ) || ! user_can( $current_user, 'install_themes' ) ) {
			return new WP_Error(
				WC_REST_WCCOM_Site_Installer_Errors::NO_PERMISSION_CODE,
				WC_REST_WCCOM_Site_Installer_Errors::NO_PERMISSION_MESSAGE,
				array( 'status' => WC_REST_WCCOM_Site_Installer_Errors::NO_PERMISSION_HTTP_CODE )
			);
		}

return true;
	}

/**
	 * Get installation state.
	 *
	 * @since 3.7.0
	 * @param WP_REST_Request $request Full details about the request.
	 * @return bool|WP_Error
	 */
	public function get_install_state( $request ) {
		$requirements_met = WC_WCCOM_Site_Installer_Requirements_Check::met_requirements();
		if ( is_wp_error( $requirements_met ) ) {
			return $requirements_met;
		}

return rest_ensure_response( WC_WCCOM_Site_Installer::get_state() );
	}

/**
	 * Install WooCommerce.com products.
	 *
	 * @since 3.7.0
	 * @param WP_REST_Request $request Full details about the request.
	 * @return bool|WP_Error
	 */
	public function install( $request ) {
		$requirements_met = WC_WCCOM_Site_Installer_Requirements_Check::met_requirements();
		if ( is_wp_error( $requirements_met ) ) {
			return $requirements_met;
		}

if ( empty( $request['products'] ) ) {
			return new WP_Error( 'missing_products', __( 'Missing products in request body.', 'woocommerce' ), array( 'status' => 400 ) );
		}

$validation_result = $this->validate_products( $request['products'] );
		if ( is_wp_error( $validation_result ) ) {
			return $validation_result;
		}

return rest_ensure_response( WC_WCCOM_Site_Installer::schedule_install( $request['products'] ) );
	}

/**
	 * Reset installation state.
	 *
	 * @since 3.7.0
	 * @param WP_REST_Request $request Full details about the request.
	 * @return bool|WP_Error
	 */
	public function reset_install( $request ) {
		$resp = rest_ensure_response( WC_WCCOM_Site_Installer::reset_state() );
		$resp->set_status( 204 );

return $resp;
	}

/**
	 * Validate products from request body.
	 *
	 * @since 3.7.0
	 * @param array $products Array of products where key is product ID and
	 *                        element is install args.
	 * @return bool|WP_Error
	 */
	protected function validate_products( $products ) {
		$err = new WP_Error( 'invalid_products', __( 'Invalid products in request body.', 'woocommerce' ), array( 'status' => 400 ) );

if ( ! is_array( $products ) ) {
			return $err;
		}

foreach ( $products as $product_id => $install_args ) {
			if ( ! absint( $product_id ) ) {
				return $err;
			}

if ( empty( $install_args ) || ! is_array( $install_args ) ) {
				return $err;
			}
		}

return true;
	}
}

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