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<?php if ( !defined( 'ABSPATH' ) ) { exit; } /** * AI Engine MCP OAuth 2.1 module. * * Implements OAuth 2.1 with Dynamic Client Registration (RFC 7591), * PKCE (RFC 7636, S256 only), Authorization Server Metadata (RFC 8414), * Protected Resource Metadata (RFC 9728), and Token Revocation (RFC 7009), * matching the MCP authorization specification. * * This module is additive: the legacy static bearer token continues to work * for developer tooling. OAuth is the consumer-facing path used by clients * like Claude Desktop that drive the user through a browser authorize flow. */ class Meow_MWAI_Labs_MCP_OAuth { public const DB_VERSION = '1.0.0'; public const ACCESS_TOKEN_TTL = 3600; // 1 hour public const REFRESH_TOKEN_TTL = 2592000; // 30 days public const AUTH_CODE_TTL = 60; // seconds public const NONCE_ACTION = 'mwai_mcp_oauth_consent'; private $core; private $mcp; private $namespace = 'mcp/v1'; private $logging = false; private $table_clients; private $table_tokens; public function __construct( $core, $mcp ) { global $wpdb; $this->core = $core; $this->mcp = $mcp; $this->logging = method_exists( $mcp, 'is_logging_enabled' ) ? $mcp->is_logging_enabled() : false; $this->table_clients = $wpdb->prefix . 'mwai_mcp_oauth_clients'; $this->table_tokens = $wpdb->prefix . 'mwai_mcp_oauth_tokens'; $this->maybe_upgrade_db(); add_action( 'rest_api_init', [ $this, 'register_routes' ] ); add_filter( 'rest_post_dispatch', [ $this, 'add_www_authenticate_header' ], 10, 3 ); // WP's REST cookie nonce check silently downgrades cookie-authed users to guest // when no X-WP-Nonce is sent. The browser-driven authorize flow needs the user's // identity from the cookie without a REST nonce, so we re-validate the auth cookie // for that route. CSRF is enforced separately via our own consent nonce on POST. add_filter( 'rest_authentication_errors', [ $this, 'reauth_for_authorize' ], 200 ); // Serve well-known metadata at the host root too. RFC 9728/8414 specify the // well-known URI is built by inserting /.well-known/<suffix> between the host // and the path of the resource/issuer, so strict clients query the host root // rather than the nested REST path. Run very early to short-circuit WP's 404. add_action( 'parse_request', [ $this, 'handle_host_root_wellknown' ], 1 ); } /** * Serve OAuth well-known metadata from the host root. Handles all three URL * shapes that clients use in the wild: bare host-root, host-root + resource * path (RFC strict), and the nested REST path is already covered by the REST * route registration. */ public function handle_host_root_wellknown() { $uri = isset( $_SERVER['REQUEST_URI'] ) ? (string) $_SERVER['REQUEST_URI'] : ''; $path = strtok( $uri, '?' ); if ( $path === false || strpos( $path, '/.well-known/' ) !== 0 ) { return; } if ( strpos( $path, '/.well-known/oauth-protected-resource' ) === 0 ) { if ( $this->logging ) { error_log( '[AI Engine MCP OAuth] Host-root PRM hit: ' . $path ); } $this->emit_json( $this->protected_resource_metadata() ); } if ( strpos( $path, '/.well-known/oauth-authorization-server' ) === 0 ) { if ( $this->logging ) { error_log( '[AI Engine MCP OAuth] Host-root ASM hit: ' . $path ); } $this->emit_json( $this->authorization_server_metadata() ); } } private function emit_json( $payload ) { status_header( 200 ); nocache_headers(); header( 'Content-Type: application/json; charset=utf-8' ); header( 'Access-Control-Allow-Origin: *' ); echo wp_json_encode( $payload ); exit; } private function protected_resource_metadata() { $issuer = rest_url( $this->namespace ); return [ 'resource' => rest_url( $this->namespace . '/http' ), 'authorization_servers' => [ $issuer ], 'bearer_methods_supported' => [ 'header' ], 'scopes_supported' => [ 'mcp' ], 'resource_documentation' => 'https://meowapps.com/ai-engine/', ]; } private function authorization_server_metadata() { $issuer = rest_url( $this->namespace ); return [ 'issuer' => $issuer, 'authorization_endpoint' => rest_url( $this->namespace . '/oauth/authorize' ), 'token_endpoint' => rest_url( $this->namespace . '/oauth/token' ), 'registration_endpoint' => rest_url( $this->namespace . '/oauth/register' ), 'revocation_endpoint' => rest_url( $this->namespace . '/oauth/revoke' ), 'response_types_supported' => [ 'code' ], 'grant_types_supported' => [ 'authorization_code', 'refresh_token' ], 'token_endpoint_auth_methods_supported' => [ 'none', 'client_secret_basic', 'client_secret_post' ], 'code_challenge_methods_supported' => [ 'S256' ], 'scopes_supported' => [ 'mcp' ], ]; } public function reauth_for_authorize( $result ) { $uri = isset( $_SERVER['REQUEST_URI'] ) ? (string) $_SERVER['REQUEST_URI'] : ''; if ( strpos( $uri, '/' . $this->namespace . '/oauth/authorize' ) === false ) { return $result; } if ( !is_user_logged_in() ) { $user_id = wp_validate_auth_cookie( '', 'logged_in' ); if ( $user_id ) { wp_set_current_user( (int) $user_id ); } } return $result; } #region DB schema private function maybe_upgrade_db() { if ( get_option( 'mwai_mcp_oauth_db_version' ) === self::DB_VERSION ) { return; } global $wpdb; $charset_collate = $wpdb->get_charset_collate(); $sql_clients = "CREATE TABLE {$this->table_clients} ( id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, client_id VARCHAR(64) NOT NULL, client_secret_hash VARCHAR(64) NULL, client_name VARCHAR(255) NULL, redirect_uris LONGTEXT NOT NULL, grant_types VARCHAR(255) NOT NULL DEFAULT 'authorization_code,refresh_token', token_endpoint_auth_method VARCHAR(32) NOT NULL DEFAULT 'none', scope VARCHAR(255) NULL, created DATETIME NOT NULL, PRIMARY KEY (id), UNIQUE KEY client_id (client_id) ) {$charset_collate};"; $sql_tokens = "CREATE TABLE {$this->table_tokens} ( id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, client_id VARCHAR(64) NOT NULL, user_id BIGINT(20) UNSIGNED NOT NULL, access_token_hash VARCHAR(64) NOT NULL, refresh_token_hash VARCHAR(64) NULL, access_expires DATETIME NOT NULL, refresh_expires DATETIME NULL, scope VARCHAR(255) NULL, created DATETIME NOT NULL, last_used DATETIME NULL, revoked TINYINT(1) NOT NULL DEFAULT 0, PRIMARY KEY (id), KEY access_token_hash (access_token_hash), KEY refresh_token_hash (refresh_token_hash), KEY client_id (client_id), KEY user_id (user_id) ) {$charset_collate};"; require_once ABSPATH . 'wp-admin/includes/upgrade.php'; dbDelta( $sql_clients ); dbDelta( $sql_tokens ); update_option( 'mwai_mcp_oauth_db_version', self::DB_VERSION ); } #endregion #region Route registration public function register_routes() { // RFC 9728 — Protected Resource Metadata register_rest_route( $this->namespace, '/.well-known/oauth-protected-resource', [ 'methods' => 'GET', 'callback' => [ $this, 'handle_resource_metadata' ], 'permission_callback' => '__return_true', ] ); // RFC 8414 — Authorization Server Metadata register_rest_route( $this->namespace, '/.well-known/oauth-authorization-server', [ 'methods' => 'GET', 'callback' => [ $this, 'handle_as_metadata' ], 'permission_callback' => '__return_true', ] ); // RFC 7591 — Dynamic Client Registration register_rest_route( $this->namespace, '/oauth/register', [ 'methods' => 'POST', 'callback' => [ $this, 'handle_register' ], 'permission_callback' => '__return_true', ] ); // Authorization endpoint (browser-driven, returns HTML or 302) register_rest_route( $this->namespace, '/oauth/authorize', [ 'methods' => [ 'GET', 'POST' ], 'callback' => [ $this, 'handle_authorize' ], 'permission_callback' => '__return_true', ] ); // Token endpoint register_rest_route( $this->namespace, '/oauth/token', [ 'methods' => 'POST', 'callback' => [ $this, 'handle_token' ], 'permission_callback' => '__return_true', ] ); // RFC 7009 — Token Revocation register_rest_route( $this->namespace, '/oauth/revoke', [ 'methods' => 'POST', 'callback' => [ $this, 'handle_revoke' ], 'permission_callback' => '__return_true', ] ); // Admin-only: list active grants register_rest_route( $this->namespace, '/oauth/apps', [ 'methods' => 'GET', 'callback' => [ $this, 'handle_apps_list' ], 'permission_callback' => function () { return current_user_can( 'manage_options' ); }, ] ); // Admin-only: revoke a grant by id register_rest_route( $this->namespace, '/oauth/apps/(?P<id>\d+)', [ 'methods' => 'DELETE', 'callback' => [ $this, 'handle_apps_revoke' ], 'permission_callback' => function () { return current_user_can( 'manage_options' ); }, ] ); } #endregion #region Discovery (well-known) public function handle_resource_metadata() { return new WP_REST_Response( $this->protected_resource_metadata(), 200 ); } public function handle_as_metadata() { return new WP_REST_Response( $this->authorization_server_metadata(), 200 ); } #endregion #region Dynamic Client Registration (RFC 7591) public function handle_register( WP_REST_Request $request ) { $body = json_decode( $request->get_body(), true ); if ( !is_array( $body ) ) { return $this->oauth_error( 'invalid_client_metadata', 'Request body must be JSON.', 400 ); } $redirect_uris = $body['redirect_uris'] ?? null; if ( !is_array( $redirect_uris ) || empty( $redirect_uris ) ) { return $this->oauth_error( 'invalid_redirect_uri', 'redirect_uris is required and must be a non-empty array.', 400 ); } foreach ( $redirect_uris as $uri ) { if ( !is_string( $uri ) || $uri === '' ) { return $this->oauth_error( 'invalid_redirect_uri', 'Each redirect_uri must be a non-empty string.', 400 ); } // Light validation — allow http(s) and custom schemes (desktop clients use them). if ( !preg_match( '#^[a-z][a-z0-9+.\-]*://#i', $uri ) ) { return $this->oauth_error( 'invalid_redirect_uri', "redirect_uri must include a scheme: {$uri}", 400 ); } } $auth_method = isset( $body['token_endpoint_auth_method'] ) ? (string) $body['token_endpoint_auth_method'] : 'none'; if ( !in_array( $auth_method, [ 'none', 'client_secret_basic', 'client_secret_post' ], true ) ) { return $this->oauth_error( 'invalid_client_metadata', "Unsupported token_endpoint_auth_method: {$auth_method}", 400 ); } $grant_types = $body['grant_types'] ?? [ 'authorization_code', 'refresh_token' ]; if ( !is_array( $grant_types ) ) { $grant_types = [ 'authorization_code', 'refresh_token' ]; } foreach ( $grant_types as $gt ) { if ( !in_array( $gt, [ 'authorization_code', 'refresh_token' ], true ) ) { return $this->oauth_error( 'invalid_client_metadata', "Unsupported grant_type: {$gt}", 400 ); } } $client_id = $this->random_token( 32 ); $client_secret = null; $client_secret_hash = null; if ( $auth_method !== 'none' ) { $client_secret = $this->random_token( 48 ); $client_secret_hash = hash( 'sha256', $client_secret ); } $client_name = isset( $body['client_name'] ) ? sanitize_text_field( (string) $body['client_name'] ) : 'Unnamed MCP Client'; global $wpdb; $inserted = $wpdb->insert( $this->table_clients, [ 'client_id' => $client_id, 'client_secret_hash' => $client_secret_hash, 'client_name' => $client_name, 'redirect_uris' => wp_json_encode( array_values( $redirect_uris ) ), 'grant_types' => implode( ',', $grant_types ), 'token_endpoint_auth_method' => $auth_method, 'scope' => 'mcp', 'created' => current_time( 'mysql', 1 ), ] ); if ( !$inserted ) { return $this->oauth_error( 'server_error', 'Could not persist client registration.', 500 ); } if ( $this->logging ) { error_log( '[AI Engine MCP OAuth] Registered client: ' . $client_name . ' (' . $client_id . ')' ); } $response = [ 'client_id' => $client_id, 'client_name' => $client_name, 'redirect_uris' => array_values( $redirect_uris ), 'grant_types' => $grant_types, 'token_endpoint_auth_method' => $auth_method, 'client_id_issued_at' => time(), ]; if ( $client_secret !== null ) { $response['client_secret'] = $client_secret; $response['client_secret_expires_at'] = 0; // never } return new WP_REST_Response( $response, 201 ); } #endregion #region Authorize (browser flow) public function handle_authorize( WP_REST_Request $request ) { $method = $request->get_method(); if ( $method === 'POST' ) { $this->handle_authorize_submit( $request ); exit; } // GET — render consent page or redirect to login $params = [ 'response_type' => (string) ( $request->get_param( 'response_type' ) ?? '' ), 'client_id' => (string) ( $request->get_param( 'client_id' ) ?? '' ), 'redirect_uri' => (string) ( $request->get_param( 'redirect_uri' ) ?? '' ), 'state' => (string) ( $request->get_param( 'state' ) ?? '' ), 'scope' => (string) ( $request->get_param( 'scope' ) ?? 'mcp' ), 'code_challenge' => (string) ( $request->get_param( 'code_challenge' ) ?? '' ), 'code_challenge_method' => (string) ( $request->get_param( 'code_challenge_method' ) ?? '' ), ]; if ( $params['response_type'] !== 'code' ) { $this->render_error_page( 'Unsupported response_type. Only "code" is supported.' ); exit; } if ( $params['code_challenge'] === '' || $params['code_challenge_method'] !== 'S256' ) { $this->render_error_page( 'PKCE is required: provide code_challenge and code_challenge_method=S256.' ); exit; } $client = $this->get_client( $params['client_id'] ); if ( !$client ) { $this->render_error_page( 'Unknown client_id. The client must register via Dynamic Client Registration first.' ); exit; } if ( !$this->redirect_uri_registered( $client, $params['redirect_uri'] ) ) { $this->render_error_page( 'redirect_uri does not match any registered URI for this client.' ); exit; } // Authentication gate — bounce to wp-login.php if not logged in. if ( !is_user_logged_in() ) { $current_url = rest_url( $this->namespace . '/oauth/authorize' ); $current_url = add_query_arg( $params, $current_url ); wp_safe_redirect( wp_login_url( $current_url ) ); exit; } $user = wp_get_current_user(); // Capability gate. MCP grants administrative tool access by design; allowing a // non-admin to mint an OAuth token would let them act through the MCP layer with // privileges they do not hold in WordPress itself. if ( !$this->user_can_authorize( $user->ID ) ) { if ( $this->logging ) { error_log( '[AI Engine MCP OAuth] ❌ Non-admin user ' . $user->ID . ' tried to authorize client ' . $params['client_id'] ); } $this->render_error_page( 'Only administrators can authorize MCP applications on this site.' ); exit; } $this->render_consent_page( $client, $params, $user ); exit; } private function handle_authorize_submit( WP_REST_Request $request ) { if ( !is_user_logged_in() ) { wp_safe_redirect( wp_login_url() ); exit; } if ( !$this->user_can_authorize( get_current_user_id() ) ) { if ( $this->logging ) { error_log( '[AI Engine MCP OAuth] ❌ Non-admin user ' . get_current_user_id() . ' attempted authorize submit' ); } $this->render_error_page( 'Only administrators can authorize MCP applications on this site.' ); exit; } $nonce = (string) $request->get_param( '_mwai_nonce' ); if ( !wp_verify_nonce( $nonce, self::NONCE_ACTION ) ) { $this->render_error_page( 'Security check failed. Please try again from your application.' ); exit; } $client_id = (string) $request->get_param( 'client_id' ); $redirect_uri = (string) $request->get_param( 'redirect_uri' ); $state = (string) ( $request->get_param( 'state' ) ?? '' ); $code_challenge = (string) $request->get_param( 'code_challenge' ); $code_challenge_method = (string) $request->get_param( 'code_challenge_method' ); $scope = (string) ( $request->get_param( 'scope' ) ?? 'mcp' ); $action = (string) ( $request->get_param( 'action' ) ?? 'deny' ); $client = $this->get_client( $client_id ); if ( !$client || !$this->redirect_uri_registered( $client, $redirect_uri ) ) { $this->render_error_page( 'Invalid client or redirect_uri.' ); exit; } if ( $action !== 'approve' ) { $params = [ 'error' => 'access_denied', 'error_description' => 'User denied the request.' ]; if ( $state !== '' ) { $params['state'] = $state; } wp_redirect( $this->append_params( $redirect_uri, $params ) ); exit; } // Generate authorization code and stash everything needed to mint a token later. $code = $this->random_token( 48 ); $code_data = [ 'client_id' => $client_id, 'user_id' => get_current_user_id(), 'redirect_uri' => $redirect_uri, 'code_challenge' => $code_challenge, 'code_challenge_method' => $code_challenge_method, 'scope' => $scope, ]; set_transient( $this->auth_code_key( $code ), $code_data, self::AUTH_CODE_TTL ); $params = [ 'code' => $code ]; if ( $state !== '' ) { $params['state'] = $state; } if ( $this->logging ) { error_log( '[AI Engine MCP OAuth] Authorized user ' . get_current_user_id() . ' for client ' . $client_id ); } wp_redirect( $this->append_params( $redirect_uri, $params ) ); exit; } private function auth_code_key( $code ) { return 'mwai_mcp_oauth_code_' . hash( 'sha256', $code ); } #endregion #region Token endpoint public function handle_token( WP_REST_Request $request ) { $grant_type = (string) ( $request->get_param( 'grant_type' ) ?? '' ); if ( $grant_type === 'authorization_code' ) { return $this->handle_token_auth_code( $request ); } if ( $grant_type === 'refresh_token' ) { return $this->handle_token_refresh( $request ); } return $this->oauth_error( 'unsupported_grant_type', 'Supported: authorization_code, refresh_token.', 400 ); } private function handle_token_auth_code( WP_REST_Request $request ) { $code = (string) ( $request->get_param( 'code' ) ?? '' ); $redirect_uri = (string) ( $request->get_param( 'redirect_uri' ) ?? '' ); $code_verifier = (string) ( $request->get_param( 'code_verifier' ) ?? '' ); $client_id = (string) ( $request->get_param( 'client_id' ) ?? '' ); if ( $code === '' || $redirect_uri === '' || $code_verifier === '' ) { return $this->oauth_error( 'invalid_request', 'Missing code, redirect_uri, or code_verifier.', 400 ); } $key = $this->auth_code_key( $code ); $code_data = get_transient( $key ); if ( !is_array( $code_data ) ) { return $this->oauth_error( 'invalid_grant', 'Authorization code is invalid or expired.', 400 ); } // Single-use: delete immediately to prevent replay. delete_transient( $key ); if ( $code_data['redirect_uri'] !== $redirect_uri ) { return $this->oauth_error( 'invalid_grant', 'redirect_uri mismatch.', 400 ); } $client = $this->get_client( $code_data['client_id'] ); if ( !$client ) { return $this->oauth_error( 'invalid_client', 'Client not found.', 401 ); } if ( $client_id !== '' && $client_id !== $client->client_id ) { return $this->oauth_error( 'invalid_client', 'client_id mismatch.', 401 ); } if ( !$this->authenticate_client_if_required( $client, $request ) ) { return $this->oauth_error( 'invalid_client', 'Client authentication failed.', 401 ); } // Verify PKCE. $expected_challenge = rtrim( strtr( base64_encode( hash( 'sha256', $code_verifier, true ) ), '+/', '-_' ), '=' ); if ( !hash_equals( (string) $code_data['code_challenge'], $expected_challenge ) ) { return $this->oauth_error( 'invalid_grant', 'PKCE verification failed.', 400 ); } return $this->issue_token_pair( $client->client_id, (int) $code_data['user_id'], (string) $code_data['scope'] ); } private function handle_token_refresh( WP_REST_Request $request ) { $refresh_token = (string) ( $request->get_param( 'refresh_token' ) ?? '' ); $client_id = (string) ( $request->get_param( 'client_id' ) ?? '' ); if ( $refresh_token === '' ) { return $this->oauth_error( 'invalid_request', 'Missing refresh_token.', 400 ); } global $wpdb; $hash = hash( 'sha256', $refresh_token ); $row = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$this->table_tokens} WHERE refresh_token_hash = %s AND revoked = 0 LIMIT 1", $hash ) ); if ( !$row ) { return $this->oauth_error( 'invalid_grant', 'Refresh token is invalid or revoked.', 400 ); } if ( $row->refresh_expires && strtotime( $row->refresh_expires . ' UTC' ) < time() ) { return $this->oauth_error( 'invalid_grant', 'Refresh token expired.', 400 ); } $client = $this->get_client( $row->client_id ); if ( !$client ) { return $this->oauth_error( 'invalid_client', 'Client not found.', 401 ); } if ( $client_id !== '' && $client_id !== $client->client_id ) { return $this->oauth_error( 'invalid_client', 'client_id mismatch.', 401 ); } if ( !$this->authenticate_client_if_required( $client, $request ) ) { return $this->oauth_error( 'invalid_client', 'Client authentication failed.', 401 ); } // Refresh-token rotation (OAuth 2.1 best practice): revoke the old grant and issue a new pair. $wpdb->update( $this->table_tokens, [ 'revoked' => 1 ], [ 'id' => $row->id ] ); return $this->issue_token_pair( $row->client_id, (int) $row->user_id, (string) $row->scope ); } private function issue_token_pair( $client_id, $user_id, $scope ) { global $wpdb; $access_token = $this->random_token( 48 ); $refresh_token = $this->random_token( 48 ); $now = time(); $wpdb->insert( $this->table_tokens, [ 'client_id' => $client_id, 'user_id' => $user_id, 'access_token_hash' => hash( 'sha256', $access_token ), 'refresh_token_hash' => hash( 'sha256', $refresh_token ), 'access_expires' => gmdate( 'Y-m-d H:i:s', $now + self::ACCESS_TOKEN_TTL ), 'refresh_expires' => gmdate( 'Y-m-d H:i:s', $now + self::REFRESH_TOKEN_TTL ), 'scope' => $scope, 'created' => gmdate( 'Y-m-d H:i:s', $now ), ] ); $response = new WP_REST_Response( [ 'access_token' => $access_token, 'token_type' => 'Bearer', 'expires_in' => self::ACCESS_TOKEN_TTL, 'refresh_token' => $refresh_token, 'scope' => $scope, ], 200 ); $response->header( 'Cache-Control', 'no-store' ); $response->header( 'Pragma', 'no-cache' ); return $response; } private function authenticate_client_if_required( $client, WP_REST_Request $request ) { if ( $client->token_endpoint_auth_method === 'none' ) { return true; } $provided_secret = ''; if ( $client->token_endpoint_auth_method === 'client_secret_basic' ) { $auth = $request->get_header( 'authorization' ); if ( $auth && preg_match( '#^Basic\s+(.+)$#i', $auth, $m ) ) { $decoded = base64_decode( $m[1], true ); if ( $decoded && strpos( $decoded, ':' ) !== false ) { [ $cid, $secret ] = explode( ':', $decoded, 2 ); if ( $cid === $client->client_id ) { $provided_secret = $secret; } } } } else { $provided_secret = (string) ( $request->get_param( 'client_secret' ) ?? '' ); } if ( $provided_secret === '' || !$client->client_secret_hash ) { return false; } return hash_equals( $client->client_secret_hash, hash( 'sha256', $provided_secret ) ); } #endregion #region Revocation public function handle_revoke( WP_REST_Request $request ) { $token = (string) ( $request->get_param( 'token' ) ?? '' ); if ( $token === '' ) { // RFC 7009: return 200 even on unknown tokens to avoid information leakage. return new WP_REST_Response( null, 200 ); } global $wpdb; $hash = hash( 'sha256', $token ); $wpdb->query( $wpdb->prepare( "UPDATE {$this->table_tokens} SET revoked = 1 WHERE access_token_hash = %s OR refresh_token_hash = %s", $hash, $hash ) ); return new WP_REST_Response( null, 200 ); } #endregion #region Capability gate /** * Whether a user is allowed to authorize an OAuth client and to use an OAuth * access token against the MCP endpoint. Defaults to administrator only, * matching the documented MCP access model. The filter exists so the planned * multi-user MCP work can broaden this safely once per-token capability * scoping lands; until then, allowing a non-admin here re-opens CVE-class * privilege escalation through tools like wp_create_user. */ public function user_can_authorize( $user_id ) { $user_id = (int) $user_id; $allowed = $user_id > 0 && user_can( $user_id, 'administrator' ); return (bool) apply_filters( 'mwai_mcp_oauth_user_can_authorize', $allowed, $user_id ); } #endregion #region Token validation (called from MCP auth path) /** * Validate an access token for protected resource access. * Returns [ 'user_id' => N, 'client_id' => '...', 'scope' => '...' ] on success, null on failure. * Also touches last_used so the admin UI can show recent activity. */ public function validate_token( $token ) { if ( !is_string( $token ) || $token === '' ) { return null; } global $wpdb; $hash = hash( 'sha256', $token ); $row = $wpdb->get_row( $wpdb->prepare( "SELECT t.*, c.client_name FROM {$this->table_tokens} t LEFT JOIN {$this->table_clients} c ON c.client_id = t.client_id WHERE t.access_token_hash = %s AND t.revoked = 0 LIMIT 1", $hash ) ); if ( !$row ) { return null; } if ( strtotime( $row->access_expires . ' UTC' ) < time() ) { return null; } // Touch last_used (non-blocking, single UPDATE). $wpdb->update( $this->table_tokens, [ 'last_used' => current_time( 'mysql', 1 ) ], [ 'id' => $row->id ] ); return [ 'user_id' => (int) $row->user_id, 'client_id' => $row->client_id, 'client_name' => $row->client_name, 'scope' => $row->scope, ]; } #endregion #region Admin: list / revoke grants public function handle_apps_list() { global $wpdb; $rows = $wpdb->get_results( "SELECT t.id, t.client_id, t.user_id, t.created, t.last_used, t.access_expires, t.refresh_expires, t.revoked, c.client_name FROM {$this->table_tokens} t LEFT JOIN {$this->table_clients} c ON c.client_id = t.client_id WHERE t.revoked = 0 ORDER BY t.created DESC" ); $out = []; foreach ( $rows as $r ) { $user = get_userdata( (int) $r->user_id ); $out[] = [ 'id' => (int) $r->id, 'client_id' => $r->client_id, 'client_name' => $r->client_name ?: 'Unknown app', 'user_id' => (int) $r->user_id, 'user_login' => $user ? $user->user_login : 'deleted', 'user_display' => $user ? $user->display_name : 'Deleted user', 'created' => $r->created, 'last_used' => $r->last_used, 'access_expires' => $r->access_expires, 'refresh_expires' => $r->refresh_expires, ]; } return new WP_REST_Response( [ 'apps' => $out ], 200 ); } public function handle_apps_revoke( WP_REST_Request $request ) { $id = (int) $request->get_param( 'id' ); if ( $id <= 0 ) { return new WP_REST_Response( [ 'error' => 'Invalid id.' ], 400 ); } global $wpdb; $wpdb->update( $this->table_tokens, [ 'revoked' => 1 ], [ 'id' => $id ] ); return new WP_REST_Response( [ 'revoked' => true ], 200 ); } #endregion #region Helpers private function get_client( $client_id ) { if ( !is_string( $client_id ) || $client_id === '' ) { return null; } global $wpdb; return $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$this->table_clients} WHERE client_id = %s LIMIT 1", $client_id ) ); } private function redirect_uri_registered( $client, $redirect_uri ) { if ( !$client || !is_string( $redirect_uri ) || $redirect_uri === '' ) { return false; } $registered = json_decode( $client->redirect_uris, true ); if ( !is_array( $registered ) ) { return false; } foreach ( $registered as $uri ) { if ( hash_equals( (string) $uri, $redirect_uri ) ) { return true; } } return false; } private function append_params( $url, $params ) { $sep = strpos( $url, '?' ) === false ? '?' : '&'; return $url . $sep . http_build_query( $params ); } private function random_token( $bytes = 32 ) { return bin2hex( random_bytes( (int) $bytes ) ); } private function oauth_error( $code, $description, $status = 400 ) { $response = new WP_REST_Response( [ 'error' => $code, 'error_description' => $description, ], $status ); $response->header( 'Cache-Control', 'no-store' ); $response->header( 'Pragma', 'no-cache' ); return $response; } /** * Add WWW-Authenticate header to 401 responses on the protected MCP route, * pointing clients at the resource metadata document so they can discover * the authorization server automatically. */ public function add_www_authenticate_header( $response, $server, $request ) { if ( !( $response instanceof WP_HTTP_Response ) ) { return $response; } $route = $request instanceof WP_REST_Request ? $request->get_route() : ''; if ( $route !== '/' . $this->namespace . '/http' ) { return $response; } $status = $response->get_status(); if ( $status !== 401 && $status !== 403 ) { return $response; } $resource_metadata = rest_url( $this->namespace . '/.well-known/oauth-protected-resource' ); $response->header( 'WWW-Authenticate', sprintf( 'Bearer realm="MCP", resource_metadata="%s"', $resource_metadata ) ); return $response; } #endregion #region HTML rendering (consent + error pages) private function render_consent_page( $client, $params, $user ) { $nonce = wp_create_nonce( self::NONCE_ACTION ); $action_url = rest_url( $this->namespace . '/oauth/authorize' ); $site_name = get_bloginfo( 'name' ); $client_name = $client->client_name ?: 'Unnamed MCP Client'; $role_label = $this->describe_user_role( $user ); status_header( 200 ); nocache_headers(); header( 'Content-Type: text/html; charset=utf-8' ); $hidden_fields = [ 'client_id' => $params['client_id'], 'redirect_uri' => $params['redirect_uri'], 'state' => $params['state'], 'scope' => $params['scope'], 'code_challenge' => $params['code_challenge'], 'code_challenge_method' => $params['code_challenge_method'], '_mwai_nonce' => $nonce, ]; echo '<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">'; echo '<meta name="viewport" content="width=device-width, initial-scale=1">'; echo '<title>' . esc_html( sprintf( 'Authorize %s', $client_name ) ) . '</title>'; echo $this->consent_styles(); echo '</head><body><main class="mwai-oauth-card">'; echo '<h1>Authorize this app</h1>'; echo '<p class="mwai-oauth-app"><strong>' . esc_html( $client_name ) . '</strong> wants to connect to <strong>' . esc_html( $site_name ) . '</strong>.</p>'; echo '<div class="mwai-oauth-meta">'; echo '<div><span class="mwai-oauth-label">Signed in as</span><span class="mwai-oauth-value">' . esc_html( $user->display_name ) . ' (' . esc_html( $user->user_login ) . ')</span></div>'; echo '<div><span class="mwai-oauth-label">Permissions</span><span class="mwai-oauth-value">' . esc_html( $role_label ) . '</span></div>'; echo '</div>'; echo '<p class="mwai-oauth-note">The app will be able to call MCP tools using your account. You can revoke access at any time from AI Engine settings.</p>'; echo '<form method="POST" action="' . esc_url( $action_url ) . '">'; foreach ( $hidden_fields as $name => $value ) { echo '<input type="hidden" name="' . esc_attr( $name ) . '" value="' . esc_attr( $value ) . '">'; } echo '<div class="mwai-oauth-buttons">'; echo '<button type="submit" name="action" value="approve" class="mwai-oauth-approve">Approve</button>'; echo '<button type="submit" name="action" value="deny" class="mwai-oauth-deny">Deny</button>'; echo '</div>'; echo '</form>'; echo '</main></body></html>'; } private function render_error_page( $message ) { status_header( 400 ); nocache_headers(); header( 'Content-Type: text/html; charset=utf-8' ); echo '<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">'; echo '<title>Authorization error</title>'; echo $this->consent_styles(); echo '</head><body><main class="mwai-oauth-card">'; echo '<h1>Authorization error</h1>'; echo '<p class="mwai-oauth-note">' . esc_html( $message ) . '</p>'; echo '</main></body></html>'; } private function describe_user_role( $user ) { if ( !$user || empty( $user->roles ) ) { return 'No role'; } $role = $user->roles[0]; $names = [ 'administrator' => 'Administrator (full access)', 'editor' => 'Editor', 'author' => 'Author', 'contributor' => 'Contributor', 'subscriber' => 'Subscriber', ]; return $names[ $role ] ?? ucfirst( $role ); } private function consent_styles() { return '<style> body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: #f1f2f5; color: #1d2330; display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; } .mwai-oauth-card { background: #fff; border-radius: 12px; box-shadow: 0 12px 40px rgba(0,0,0,0.08); padding: 36px 36px 28px; max-width: 440px; width: 100%; } .mwai-oauth-card h1 { font-size: 22px; margin: 0 0 16px; font-weight: 600; } .mwai-oauth-app { font-size: 15px; line-height: 1.5; margin: 0 0 24px; } .mwai-oauth-meta { background: #f7f8fa; border-radius: 8px; padding: 14px 16px; margin-bottom: 20px; } .mwai-oauth-meta > div { display: flex; justify-content: space-between; align-items: baseline; padding: 6px 0; font-size: 14px; } .mwai-oauth-label { color: #6b7280; } .mwai-oauth-value { color: #1d2330; font-weight: 500; text-align: right; } .mwai-oauth-note { font-size: 13px; color: #6b7280; line-height: 1.5; margin: 0 0 24px; } .mwai-oauth-buttons { display: flex; gap: 10px; } .mwai-oauth-buttons button { flex: 1; padding: 11px 14px; border-radius: 8px; border: 1px solid transparent; font-size: 14px; font-weight: 600; cursor: pointer; transition: background .15s; } .mwai-oauth-approve { background: #2271b1; color: #fff; } .mwai-oauth-approve:hover { background: #135e96; } .mwai-oauth-deny { background: #fff; color: #1d2330; border-color: #d0d4da; } .mwai-oauth-deny:hover { background: #f1f2f5; } </style>'; } #endregion }
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