<?php

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/**

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* MCP Adapter Provider class file.

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*/

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declare( strict_types=1 );

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namespace Automattic\WooCommerce\Internal\MCP;

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use Automattic\WooCommerce\Utilities\FeaturesUtil;

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use Automattic\WooCommerce\Internal\Abilities\AbilitiesRegistry;

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use Automattic\WooCommerce\Internal\MCP\Transport\WooCommerceRestTransport;

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defined( 'ABSPATH' ) || exit;

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/**

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* MCP Adapter Provider class for WooCommerce.

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*

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* Manages MCP (Model Context Protocol) adapter initialization and server configuration.

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* Abilities should be registered separately using the WordPress Abilities API.

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*/

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class MCPAdapterProvider {

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/**

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* MCP server namespace.

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*

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* @var string

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*/

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const MCP_NAMESPACE = 'woocommerce';

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/**

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* MCP server route.

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*

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* @var string

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*/

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const MCP_ROUTE = 'mcp';

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/**

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* Whether MCP adapter is initialized.

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*

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* @var bool

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*/

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private bool $initialized = false;

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/**

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* Constructor.

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*/

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public function __construct() {

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/*

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* Hook into rest_api_init with priority 10 to initialize only on REST API requests.

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* MCP adapter registers on rest_api_init with priority 20000, so we initialize earlier.

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* This prevents unnecessary MCP initialization on favicon, cron, or admin requests.

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*/

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add_action( 'rest_api_init', array( $this, 'maybe_initialize' ), 10 );

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}

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/**

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* Check feature flag and initialize MCP adapter if enabled.

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*/

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public function maybe_initialize(): void {

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// Check if MCP integration feature is enabled.

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if ( ! FeaturesUtil::feature_is_enabled( 'mcp_integration' ) ) {

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return;

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}

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// Prevent double initialization.

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if ( $this->initialized ) {

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return;

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}

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$this->initialize_mcp_adapter();

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$this->register_hooks();

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$this->initialized = true;

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}

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/**

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* Initialize the MCP adapter.

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*/

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private function initialize_mcp_adapter(): void {

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// Check if MCP adapter class exists (should be autoloaded by WooCommerce's composer).

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if ( ! class_exists( 'WP\MCP\Core\McpAdapter' ) ) {

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if ( function_exists( 'wc_get_logger' ) ) {

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wc_get_logger()->warning(

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'MCP adapter class not found. Skipping MCP initialization.',

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array( 'source' => 'woocommerce-mcp' )

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);

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}

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return;

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}

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// Initialize the MCP adapter instance - this triggers the rest_api_init hook registration.

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\WP\MCP\Core\McpAdapter::instance();

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}

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/**

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* Register WordPress hooks for MCP adapter.

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*/

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private function register_hooks(): void {

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// Initialize MCP server when MCP adapter is ready.

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add_action( 'mcp_adapter_init', array( $this, 'initialize_mcp_server' ) );

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}

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/**

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* Initialize MCP server.

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*

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* @param object $adapter MCP adapter instance.

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*/

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public function initialize_mcp_server( $adapter ): void {

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// Get filtered abilities for MCP server.

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$abilities_ids = $this->get_woocommerce_mcp_abilities();

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// Bail if no abilities are available.

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if ( empty( $abilities_ids ) ) {

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return;

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}

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/*

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* Temporarily disable MCP validation during server creation.

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* Workaround for validator bug with union types (e.g., ["integer", "null"]).

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* This will be removed once the mcp-adapter validator bug is fixed.

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*

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* @see https://github.com/WordPress/mcp-adapter/issues/47

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*/

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add_filter( 'mcp_validation_enabled', array( __CLASS__, 'disable_mcp_validation' ), 999 );

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try {

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// Create MCP server.

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$adapter->create_server(

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'woocommerce-mcp',

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self::MCP_NAMESPACE,

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self::MCP_ROUTE,

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__( 'WooCommerce MCP Server', 'woocommerce' ),

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__( 'AI-accessible WooCommerce operations via MCP', 'woocommerce' ),

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'1.0.0',

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array( WooCommerceRestTransport::class ),

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\WP\MCP\Infrastructure\ErrorHandling\ErrorLogMcpErrorHandler::class,

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\WP\MCP\Infrastructure\Observability\NullMcpObservabilityHandler::class,

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$abilities_ids,

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);

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} catch ( \Throwable $e ) {

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if ( function_exists( 'wc_get_logger' ) ) {

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wc_get_logger()->error(

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'MCP server initialization failed: ' . $e->getMessage(),

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array( 'source' => 'woocommerce-mcp' )

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);

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}

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} finally {

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// Re-enable MCP validation immediately after server creation.

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remove_filter( 'mcp_validation_enabled', array( __CLASS__, 'disable_mcp_validation' ), 999 );

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}

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}

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/**

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* Get WooCommerce abilities for MCP server.

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*

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* Filters abilities to include only those with 'woocommerce/' namespace by default,

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* with a filter to allow inclusion of abilities from other namespaces.

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*

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* @return array Array of ability IDs for MCP server.

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*/

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private function get_woocommerce_mcp_abilities(): array {

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// Get all abilities from the registry.

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$abilities_registry = wc_get_container()->get( AbilitiesRegistry::class );

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$all_abilities_ids = $abilities_registry->get_abilities_ids();

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// Filter abilities based on namespace and custom filter.

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$mcp_abilities = array_filter(

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$all_abilities_ids,

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static function ( $ability_id ) {

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// Include WooCommerce abilities by default.

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$include = str_starts_with( $ability_id, 'woocommerce/' );

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// Allow filter to override inclusion decision.

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/**

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* Filter to override MCP ability inclusion decision.

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*

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* @since 10.3.0

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*

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* @param bool $include Whether to include the ability.

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* @param string $ability_id The ability ID.

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*/

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return apply_filters( 'woocommerce_mcp_include_ability', $include, $ability_id );

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}

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);

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// Re-index array.

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return array_values( $mcp_abilities );

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}

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/**

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* Temporarily disable MCP validation.

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*

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* Used as a callback for the mcp_validation_enabled filter to work around

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* validator bugs with union types.

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*

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* @return bool Always returns false to disable validation.

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*/

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public static function disable_mcp_validation(): bool {

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return false;

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}

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/**

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* Check if MCP adapter is initialized.

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*

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* @return bool Whether MCP adapter is initialized.

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*/

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public function is_initialized(): bool {

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return $this->initialized;

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}

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/**

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* Check if the current request is for the MCP endpoint.

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*

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* @return bool True if this is an MCP endpoint request.

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*/

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public static function is_mcp_request(): bool {

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// Check if this is a REST request.

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if ( ! wp_is_serving_rest_request() ) {

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return false;

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}

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// Get the request URI.

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$request_uri = isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '';

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// Build the MCP endpoint path dynamically from constants.

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$mcp_endpoint = '/' . self::MCP_NAMESPACE . '/' . self::MCP_ROUTE;

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// Check if the request is for the MCP endpoint.

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return false !== strpos( $request_uri, $mcp_endpoint );

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}

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}

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