mcp-core.php
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mcp-oauth.php
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mcp-rest.php
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wpai-gateway.php
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mcp-oauth.php
875 lines
| 1 | <?php |
| 2 | |
| 3 | if ( !defined( 'ABSPATH' ) ) { |
| 4 | exit; |
| 5 | } |
| 6 | |
| 7 | /** |
| 8 | * AI Engine MCP OAuth 2.1 module. |
| 9 | * |
| 10 | * Implements OAuth 2.1 with Dynamic Client Registration (RFC 7591), |
| 11 | * PKCE (RFC 7636, S256 only), Authorization Server Metadata (RFC 8414), |
| 12 | * Protected Resource Metadata (RFC 9728), and Token Revocation (RFC 7009), |
| 13 | * matching the MCP authorization specification. |
| 14 | * |
| 15 | * This module is additive: the legacy static bearer token continues to work |
| 16 | * for developer tooling. OAuth is the consumer-facing path used by clients |
| 17 | * like Claude Desktop that drive the user through a browser authorize flow. |
| 18 | */ |
| 19 | class Meow_MWAI_Labs_MCP_OAuth { |
| 20 | |
| 21 | const DB_VERSION = '1.0.0'; |
| 22 | const ACCESS_TOKEN_TTL = 3600; // 1 hour |
| 23 | const REFRESH_TOKEN_TTL = 2592000; // 30 days |
| 24 | const AUTH_CODE_TTL = 60; // seconds |
| 25 | const NONCE_ACTION = 'mwai_mcp_oauth_consent'; |
| 26 | |
| 27 | private $core; |
| 28 | private $mcp; |
| 29 | private $namespace = 'mcp/v1'; |
| 30 | private $logging = false; |
| 31 | private $table_clients; |
| 32 | private $table_tokens; |
| 33 | |
| 34 | public function __construct( $core, $mcp ) { |
| 35 | global $wpdb; |
| 36 | $this->core = $core; |
| 37 | $this->mcp = $mcp; |
| 38 | $this->logging = method_exists( $mcp, 'is_logging_enabled' ) ? $mcp->is_logging_enabled() : false; |
| 39 | $this->table_clients = $wpdb->prefix . 'mwai_mcp_oauth_clients'; |
| 40 | $this->table_tokens = $wpdb->prefix . 'mwai_mcp_oauth_tokens'; |
| 41 | |
| 42 | $this->maybe_upgrade_db(); |
| 43 | |
| 44 | add_action( 'rest_api_init', [ $this, 'register_routes' ] ); |
| 45 | add_filter( 'rest_post_dispatch', [ $this, 'add_www_authenticate_header' ], 10, 3 ); |
| 46 | // WP's REST cookie nonce check silently downgrades cookie-authed users to guest |
| 47 | // when no X-WP-Nonce is sent. The browser-driven authorize flow needs the user's |
| 48 | // identity from the cookie without a REST nonce, so we re-validate the auth cookie |
| 49 | // for that route. CSRF is enforced separately via our own consent nonce on POST. |
| 50 | add_filter( 'rest_authentication_errors', [ $this, 'reauth_for_authorize' ], 200 ); |
| 51 | // Serve well-known metadata at the host root too. RFC 9728/8414 specify the |
| 52 | // well-known URI is built by inserting /.well-known/<suffix> between the host |
| 53 | // and the path of the resource/issuer, so strict clients query the host root |
| 54 | // rather than the nested REST path. Run very early to short-circuit WP's 404. |
| 55 | add_action( 'parse_request', [ $this, 'handle_host_root_wellknown' ], 1 ); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Serve OAuth well-known metadata from the host root. Handles all three URL |
| 60 | * shapes that clients use in the wild: bare host-root, host-root + resource |
| 61 | * path (RFC strict), and the nested REST path is already covered by the REST |
| 62 | * route registration. |
| 63 | */ |
| 64 | public function handle_host_root_wellknown() { |
| 65 | $uri = isset( $_SERVER['REQUEST_URI'] ) ? (string) $_SERVER['REQUEST_URI'] : ''; |
| 66 | $path = strtok( $uri, '?' ); |
| 67 | if ( $path === false || strpos( $path, '/.well-known/' ) !== 0 ) { |
| 68 | return; |
| 69 | } |
| 70 | if ( strpos( $path, '/.well-known/oauth-protected-resource' ) === 0 ) { |
| 71 | if ( $this->logging ) { |
| 72 | error_log( '[AI Engine MCP OAuth] Host-root PRM hit: ' . $path ); |
| 73 | } |
| 74 | $this->emit_json( $this->protected_resource_metadata() ); |
| 75 | } |
| 76 | if ( strpos( $path, '/.well-known/oauth-authorization-server' ) === 0 ) { |
| 77 | if ( $this->logging ) { |
| 78 | error_log( '[AI Engine MCP OAuth] Host-root ASM hit: ' . $path ); |
| 79 | } |
| 80 | $this->emit_json( $this->authorization_server_metadata() ); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | private function emit_json( $payload ) { |
| 85 | status_header( 200 ); |
| 86 | nocache_headers(); |
| 87 | header( 'Content-Type: application/json; charset=utf-8' ); |
| 88 | header( 'Access-Control-Allow-Origin: *' ); |
| 89 | echo wp_json_encode( $payload ); |
| 90 | exit; |
| 91 | } |
| 92 | |
| 93 | private function protected_resource_metadata() { |
| 94 | $issuer = rest_url( $this->namespace ); |
| 95 | return [ |
| 96 | 'resource' => rest_url( $this->namespace . '/http' ), |
| 97 | 'authorization_servers' => [ $issuer ], |
| 98 | 'bearer_methods_supported' => [ 'header' ], |
| 99 | 'scopes_supported' => [ 'mcp' ], |
| 100 | 'resource_documentation' => 'https://meowapps.com/ai-engine/', |
| 101 | ]; |
| 102 | } |
| 103 | |
| 104 | private function authorization_server_metadata() { |
| 105 | $issuer = rest_url( $this->namespace ); |
| 106 | return [ |
| 107 | 'issuer' => $issuer, |
| 108 | 'authorization_endpoint' => rest_url( $this->namespace . '/oauth/authorize' ), |
| 109 | 'token_endpoint' => rest_url( $this->namespace . '/oauth/token' ), |
| 110 | 'registration_endpoint' => rest_url( $this->namespace . '/oauth/register' ), |
| 111 | 'revocation_endpoint' => rest_url( $this->namespace . '/oauth/revoke' ), |
| 112 | 'response_types_supported' => [ 'code' ], |
| 113 | 'grant_types_supported' => [ 'authorization_code', 'refresh_token' ], |
| 114 | 'token_endpoint_auth_methods_supported' => [ 'none', 'client_secret_basic', 'client_secret_post' ], |
| 115 | 'code_challenge_methods_supported' => [ 'S256' ], |
| 116 | 'scopes_supported' => [ 'mcp' ], |
| 117 | ]; |
| 118 | } |
| 119 | |
| 120 | public function reauth_for_authorize( $result ) { |
| 121 | $uri = isset( $_SERVER['REQUEST_URI'] ) ? (string) $_SERVER['REQUEST_URI'] : ''; |
| 122 | if ( strpos( $uri, '/' . $this->namespace . '/oauth/authorize' ) === false ) { |
| 123 | return $result; |
| 124 | } |
| 125 | if ( !is_user_logged_in() ) { |
| 126 | $user_id = wp_validate_auth_cookie( '', 'logged_in' ); |
| 127 | if ( $user_id ) { |
| 128 | wp_set_current_user( (int) $user_id ); |
| 129 | } |
| 130 | } |
| 131 | return $result; |
| 132 | } |
| 133 | |
| 134 | #region DB schema |
| 135 | private function maybe_upgrade_db() { |
| 136 | if ( get_option( 'mwai_mcp_oauth_db_version' ) === self::DB_VERSION ) { |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | global $wpdb; |
| 141 | $charset_collate = $wpdb->get_charset_collate(); |
| 142 | |
| 143 | $sql_clients = "CREATE TABLE {$this->table_clients} ( |
| 144 | id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, |
| 145 | client_id VARCHAR(64) NOT NULL, |
| 146 | client_secret_hash VARCHAR(64) NULL, |
| 147 | client_name VARCHAR(255) NULL, |
| 148 | redirect_uris LONGTEXT NOT NULL, |
| 149 | grant_types VARCHAR(255) NOT NULL DEFAULT 'authorization_code,refresh_token', |
| 150 | token_endpoint_auth_method VARCHAR(32) NOT NULL DEFAULT 'none', |
| 151 | scope VARCHAR(255) NULL, |
| 152 | created DATETIME NOT NULL, |
| 153 | PRIMARY KEY (id), |
| 154 | UNIQUE KEY client_id (client_id) |
| 155 | ) {$charset_collate};"; |
| 156 | |
| 157 | $sql_tokens = "CREATE TABLE {$this->table_tokens} ( |
| 158 | id BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, |
| 159 | client_id VARCHAR(64) NOT NULL, |
| 160 | user_id BIGINT(20) UNSIGNED NOT NULL, |
| 161 | access_token_hash VARCHAR(64) NOT NULL, |
| 162 | refresh_token_hash VARCHAR(64) NULL, |
| 163 | access_expires DATETIME NOT NULL, |
| 164 | refresh_expires DATETIME NULL, |
| 165 | scope VARCHAR(255) NULL, |
| 166 | created DATETIME NOT NULL, |
| 167 | last_used DATETIME NULL, |
| 168 | revoked TINYINT(1) NOT NULL DEFAULT 0, |
| 169 | PRIMARY KEY (id), |
| 170 | KEY access_token_hash (access_token_hash), |
| 171 | KEY refresh_token_hash (refresh_token_hash), |
| 172 | KEY client_id (client_id), |
| 173 | KEY user_id (user_id) |
| 174 | ) {$charset_collate};"; |
| 175 | |
| 176 | require_once ABSPATH . 'wp-admin/includes/upgrade.php'; |
| 177 | dbDelta( $sql_clients ); |
| 178 | dbDelta( $sql_tokens ); |
| 179 | |
| 180 | update_option( 'mwai_mcp_oauth_db_version', self::DB_VERSION ); |
| 181 | } |
| 182 | #endregion |
| 183 | |
| 184 | #region Route registration |
| 185 | public function register_routes() { |
| 186 | // RFC 9728 — Protected Resource Metadata |
| 187 | register_rest_route( $this->namespace, '/.well-known/oauth-protected-resource', [ |
| 188 | 'methods' => 'GET', |
| 189 | 'callback' => [ $this, 'handle_resource_metadata' ], |
| 190 | 'permission_callback' => '__return_true', |
| 191 | ] ); |
| 192 | |
| 193 | // RFC 8414 — Authorization Server Metadata |
| 194 | register_rest_route( $this->namespace, '/.well-known/oauth-authorization-server', [ |
| 195 | 'methods' => 'GET', |
| 196 | 'callback' => [ $this, 'handle_as_metadata' ], |
| 197 | 'permission_callback' => '__return_true', |
| 198 | ] ); |
| 199 | |
| 200 | // RFC 7591 — Dynamic Client Registration |
| 201 | register_rest_route( $this->namespace, '/oauth/register', [ |
| 202 | 'methods' => 'POST', |
| 203 | 'callback' => [ $this, 'handle_register' ], |
| 204 | 'permission_callback' => '__return_true', |
| 205 | ] ); |
| 206 | |
| 207 | // Authorization endpoint (browser-driven, returns HTML or 302) |
| 208 | register_rest_route( $this->namespace, '/oauth/authorize', [ |
| 209 | 'methods' => [ 'GET', 'POST' ], |
| 210 | 'callback' => [ $this, 'handle_authorize' ], |
| 211 | 'permission_callback' => '__return_true', |
| 212 | ] ); |
| 213 | |
| 214 | // Token endpoint |
| 215 | register_rest_route( $this->namespace, '/oauth/token', [ |
| 216 | 'methods' => 'POST', |
| 217 | 'callback' => [ $this, 'handle_token' ], |
| 218 | 'permission_callback' => '__return_true', |
| 219 | ] ); |
| 220 | |
| 221 | // RFC 7009 — Token Revocation |
| 222 | register_rest_route( $this->namespace, '/oauth/revoke', [ |
| 223 | 'methods' => 'POST', |
| 224 | 'callback' => [ $this, 'handle_revoke' ], |
| 225 | 'permission_callback' => '__return_true', |
| 226 | ] ); |
| 227 | |
| 228 | // Admin-only: list active grants |
| 229 | register_rest_route( $this->namespace, '/oauth/apps', [ |
| 230 | 'methods' => 'GET', |
| 231 | 'callback' => [ $this, 'handle_apps_list' ], |
| 232 | 'permission_callback' => function () { |
| 233 | return current_user_can( 'manage_options' ); |
| 234 | }, |
| 235 | ] ); |
| 236 | |
| 237 | // Admin-only: revoke a grant by id |
| 238 | register_rest_route( $this->namespace, '/oauth/apps/(?P<id>\d+)', [ |
| 239 | 'methods' => 'DELETE', |
| 240 | 'callback' => [ $this, 'handle_apps_revoke' ], |
| 241 | 'permission_callback' => function () { |
| 242 | return current_user_can( 'manage_options' ); |
| 243 | }, |
| 244 | ] ); |
| 245 | } |
| 246 | #endregion |
| 247 | |
| 248 | #region Discovery (well-known) |
| 249 | public function handle_resource_metadata() { |
| 250 | return new WP_REST_Response( $this->protected_resource_metadata(), 200 ); |
| 251 | } |
| 252 | |
| 253 | public function handle_as_metadata() { |
| 254 | return new WP_REST_Response( $this->authorization_server_metadata(), 200 ); |
| 255 | } |
| 256 | #endregion |
| 257 | |
| 258 | #region Dynamic Client Registration (RFC 7591) |
| 259 | public function handle_register( WP_REST_Request $request ) { |
| 260 | $body = json_decode( $request->get_body(), true ); |
| 261 | if ( !is_array( $body ) ) { |
| 262 | return $this->oauth_error( 'invalid_client_metadata', 'Request body must be JSON.', 400 ); |
| 263 | } |
| 264 | |
| 265 | $redirect_uris = $body['redirect_uris'] ?? null; |
| 266 | if ( !is_array( $redirect_uris ) || empty( $redirect_uris ) ) { |
| 267 | return $this->oauth_error( 'invalid_redirect_uri', 'redirect_uris is required and must be a non-empty array.', 400 ); |
| 268 | } |
| 269 | foreach ( $redirect_uris as $uri ) { |
| 270 | if ( !is_string( $uri ) || $uri === '' ) { |
| 271 | return $this->oauth_error( 'invalid_redirect_uri', 'Each redirect_uri must be a non-empty string.', 400 ); |
| 272 | } |
| 273 | // Light validation — allow http(s) and custom schemes (desktop clients use them). |
| 274 | if ( !preg_match( '#^[a-z][a-z0-9+.\-]*://#i', $uri ) ) { |
| 275 | return $this->oauth_error( 'invalid_redirect_uri', "redirect_uri must include a scheme: {$uri}", 400 ); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | $auth_method = isset( $body['token_endpoint_auth_method'] ) ? (string) $body['token_endpoint_auth_method'] : 'none'; |
| 280 | if ( !in_array( $auth_method, [ 'none', 'client_secret_basic', 'client_secret_post' ], true ) ) { |
| 281 | return $this->oauth_error( 'invalid_client_metadata', "Unsupported token_endpoint_auth_method: {$auth_method}", 400 ); |
| 282 | } |
| 283 | |
| 284 | $grant_types = $body['grant_types'] ?? [ 'authorization_code', 'refresh_token' ]; |
| 285 | if ( !is_array( $grant_types ) ) { |
| 286 | $grant_types = [ 'authorization_code', 'refresh_token' ]; |
| 287 | } |
| 288 | foreach ( $grant_types as $gt ) { |
| 289 | if ( !in_array( $gt, [ 'authorization_code', 'refresh_token' ], true ) ) { |
| 290 | return $this->oauth_error( 'invalid_client_metadata', "Unsupported grant_type: {$gt}", 400 ); |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | $client_id = $this->random_token( 32 ); |
| 295 | $client_secret = null; |
| 296 | $client_secret_hash = null; |
| 297 | if ( $auth_method !== 'none' ) { |
| 298 | $client_secret = $this->random_token( 48 ); |
| 299 | $client_secret_hash = hash( 'sha256', $client_secret ); |
| 300 | } |
| 301 | |
| 302 | $client_name = isset( $body['client_name'] ) ? sanitize_text_field( (string) $body['client_name'] ) : 'Unnamed MCP Client'; |
| 303 | |
| 304 | global $wpdb; |
| 305 | $inserted = $wpdb->insert( $this->table_clients, [ |
| 306 | 'client_id' => $client_id, |
| 307 | 'client_secret_hash' => $client_secret_hash, |
| 308 | 'client_name' => $client_name, |
| 309 | 'redirect_uris' => wp_json_encode( array_values( $redirect_uris ) ), |
| 310 | 'grant_types' => implode( ',', $grant_types ), |
| 311 | 'token_endpoint_auth_method' => $auth_method, |
| 312 | 'scope' => 'mcp', |
| 313 | 'created' => current_time( 'mysql', 1 ), |
| 314 | ] ); |
| 315 | if ( !$inserted ) { |
| 316 | return $this->oauth_error( 'server_error', 'Could not persist client registration.', 500 ); |
| 317 | } |
| 318 | |
| 319 | if ( $this->logging ) { |
| 320 | error_log( '[AI Engine MCP OAuth] Registered client: ' . $client_name . ' (' . $client_id . ')' ); |
| 321 | } |
| 322 | |
| 323 | $response = [ |
| 324 | 'client_id' => $client_id, |
| 325 | 'client_name' => $client_name, |
| 326 | 'redirect_uris' => array_values( $redirect_uris ), |
| 327 | 'grant_types' => $grant_types, |
| 328 | 'token_endpoint_auth_method' => $auth_method, |
| 329 | 'client_id_issued_at' => time(), |
| 330 | ]; |
| 331 | if ( $client_secret !== null ) { |
| 332 | $response['client_secret'] = $client_secret; |
| 333 | $response['client_secret_expires_at'] = 0; // never |
| 334 | } |
| 335 | return new WP_REST_Response( $response, 201 ); |
| 336 | } |
| 337 | #endregion |
| 338 | |
| 339 | #region Authorize (browser flow) |
| 340 | public function handle_authorize( WP_REST_Request $request ) { |
| 341 | $method = $request->get_method(); |
| 342 | |
| 343 | if ( $method === 'POST' ) { |
| 344 | $this->handle_authorize_submit( $request ); |
| 345 | exit; |
| 346 | } |
| 347 | |
| 348 | // GET — render consent page or redirect to login |
| 349 | $params = [ |
| 350 | 'response_type' => (string) ( $request->get_param( 'response_type' ) ?? '' ), |
| 351 | 'client_id' => (string) ( $request->get_param( 'client_id' ) ?? '' ), |
| 352 | 'redirect_uri' => (string) ( $request->get_param( 'redirect_uri' ) ?? '' ), |
| 353 | 'state' => (string) ( $request->get_param( 'state' ) ?? '' ), |
| 354 | 'scope' => (string) ( $request->get_param( 'scope' ) ?? 'mcp' ), |
| 355 | 'code_challenge' => (string) ( $request->get_param( 'code_challenge' ) ?? '' ), |
| 356 | 'code_challenge_method' => (string) ( $request->get_param( 'code_challenge_method' ) ?? '' ), |
| 357 | ]; |
| 358 | |
| 359 | if ( $params['response_type'] !== 'code' ) { |
| 360 | $this->render_error_page( 'Unsupported response_type. Only "code" is supported.' ); |
| 361 | exit; |
| 362 | } |
| 363 | if ( $params['code_challenge'] === '' || $params['code_challenge_method'] !== 'S256' ) { |
| 364 | $this->render_error_page( 'PKCE is required: provide code_challenge and code_challenge_method=S256.' ); |
| 365 | exit; |
| 366 | } |
| 367 | |
| 368 | $client = $this->get_client( $params['client_id'] ); |
| 369 | if ( !$client ) { |
| 370 | $this->render_error_page( 'Unknown client_id. The client must register via Dynamic Client Registration first.' ); |
| 371 | exit; |
| 372 | } |
| 373 | if ( !$this->redirect_uri_registered( $client, $params['redirect_uri'] ) ) { |
| 374 | $this->render_error_page( 'redirect_uri does not match any registered URI for this client.' ); |
| 375 | exit; |
| 376 | } |
| 377 | |
| 378 | // Authentication gate — bounce to wp-login.php if not logged in. |
| 379 | if ( !is_user_logged_in() ) { |
| 380 | $current_url = rest_url( $this->namespace . '/oauth/authorize' ); |
| 381 | $current_url = add_query_arg( $params, $current_url ); |
| 382 | wp_safe_redirect( wp_login_url( $current_url ) ); |
| 383 | exit; |
| 384 | } |
| 385 | |
| 386 | $user = wp_get_current_user(); |
| 387 | $this->render_consent_page( $client, $params, $user ); |
| 388 | exit; |
| 389 | } |
| 390 | |
| 391 | private function handle_authorize_submit( WP_REST_Request $request ) { |
| 392 | if ( !is_user_logged_in() ) { |
| 393 | wp_safe_redirect( wp_login_url() ); |
| 394 | exit; |
| 395 | } |
| 396 | |
| 397 | $nonce = (string) $request->get_param( '_mwai_nonce' ); |
| 398 | if ( !wp_verify_nonce( $nonce, self::NONCE_ACTION ) ) { |
| 399 | $this->render_error_page( 'Security check failed. Please try again from your application.' ); |
| 400 | exit; |
| 401 | } |
| 402 | |
| 403 | $client_id = (string) $request->get_param( 'client_id' ); |
| 404 | $redirect_uri = (string) $request->get_param( 'redirect_uri' ); |
| 405 | $state = (string) ( $request->get_param( 'state' ) ?? '' ); |
| 406 | $code_challenge = (string) $request->get_param( 'code_challenge' ); |
| 407 | $code_challenge_method = (string) $request->get_param( 'code_challenge_method' ); |
| 408 | $scope = (string) ( $request->get_param( 'scope' ) ?? 'mcp' ); |
| 409 | $action = (string) ( $request->get_param( 'action' ) ?? 'deny' ); |
| 410 | |
| 411 | $client = $this->get_client( $client_id ); |
| 412 | if ( !$client || !$this->redirect_uri_registered( $client, $redirect_uri ) ) { |
| 413 | $this->render_error_page( 'Invalid client or redirect_uri.' ); |
| 414 | exit; |
| 415 | } |
| 416 | |
| 417 | if ( $action !== 'approve' ) { |
| 418 | $params = [ 'error' => 'access_denied', 'error_description' => 'User denied the request.' ]; |
| 419 | if ( $state !== '' ) { |
| 420 | $params['state'] = $state; |
| 421 | } |
| 422 | wp_redirect( $this->append_params( $redirect_uri, $params ) ); |
| 423 | exit; |
| 424 | } |
| 425 | |
| 426 | // Generate authorization code and stash everything needed to mint a token later. |
| 427 | $code = $this->random_token( 48 ); |
| 428 | $code_data = [ |
| 429 | 'client_id' => $client_id, |
| 430 | 'user_id' => get_current_user_id(), |
| 431 | 'redirect_uri' => $redirect_uri, |
| 432 | 'code_challenge' => $code_challenge, |
| 433 | 'code_challenge_method' => $code_challenge_method, |
| 434 | 'scope' => $scope, |
| 435 | ]; |
| 436 | set_transient( $this->auth_code_key( $code ), $code_data, self::AUTH_CODE_TTL ); |
| 437 | |
| 438 | $params = [ 'code' => $code ]; |
| 439 | if ( $state !== '' ) { |
| 440 | $params['state'] = $state; |
| 441 | } |
| 442 | |
| 443 | if ( $this->logging ) { |
| 444 | error_log( '[AI Engine MCP OAuth] Authorized user ' . get_current_user_id() . ' for client ' . $client_id ); |
| 445 | } |
| 446 | |
| 447 | wp_redirect( $this->append_params( $redirect_uri, $params ) ); |
| 448 | exit; |
| 449 | } |
| 450 | |
| 451 | private function auth_code_key( $code ) { |
| 452 | return 'mwai_mcp_oauth_code_' . hash( 'sha256', $code ); |
| 453 | } |
| 454 | #endregion |
| 455 | |
| 456 | #region Token endpoint |
| 457 | public function handle_token( WP_REST_Request $request ) { |
| 458 | $grant_type = (string) ( $request->get_param( 'grant_type' ) ?? '' ); |
| 459 | |
| 460 | if ( $grant_type === 'authorization_code' ) { |
| 461 | return $this->handle_token_auth_code( $request ); |
| 462 | } |
| 463 | if ( $grant_type === 'refresh_token' ) { |
| 464 | return $this->handle_token_refresh( $request ); |
| 465 | } |
| 466 | return $this->oauth_error( 'unsupported_grant_type', 'Supported: authorization_code, refresh_token.', 400 ); |
| 467 | } |
| 468 | |
| 469 | private function handle_token_auth_code( WP_REST_Request $request ) { |
| 470 | $code = (string) ( $request->get_param( 'code' ) ?? '' ); |
| 471 | $redirect_uri = (string) ( $request->get_param( 'redirect_uri' ) ?? '' ); |
| 472 | $code_verifier = (string) ( $request->get_param( 'code_verifier' ) ?? '' ); |
| 473 | $client_id = (string) ( $request->get_param( 'client_id' ) ?? '' ); |
| 474 | |
| 475 | if ( $code === '' || $redirect_uri === '' || $code_verifier === '' ) { |
| 476 | return $this->oauth_error( 'invalid_request', 'Missing code, redirect_uri, or code_verifier.', 400 ); |
| 477 | } |
| 478 | |
| 479 | $key = $this->auth_code_key( $code ); |
| 480 | $code_data = get_transient( $key ); |
| 481 | if ( !is_array( $code_data ) ) { |
| 482 | return $this->oauth_error( 'invalid_grant', 'Authorization code is invalid or expired.', 400 ); |
| 483 | } |
| 484 | // Single-use: delete immediately to prevent replay. |
| 485 | delete_transient( $key ); |
| 486 | |
| 487 | if ( $code_data['redirect_uri'] !== $redirect_uri ) { |
| 488 | return $this->oauth_error( 'invalid_grant', 'redirect_uri mismatch.', 400 ); |
| 489 | } |
| 490 | |
| 491 | $client = $this->get_client( $code_data['client_id'] ); |
| 492 | if ( !$client ) { |
| 493 | return $this->oauth_error( 'invalid_client', 'Client not found.', 401 ); |
| 494 | } |
| 495 | if ( $client_id !== '' && $client_id !== $client->client_id ) { |
| 496 | return $this->oauth_error( 'invalid_client', 'client_id mismatch.', 401 ); |
| 497 | } |
| 498 | if ( !$this->authenticate_client_if_required( $client, $request ) ) { |
| 499 | return $this->oauth_error( 'invalid_client', 'Client authentication failed.', 401 ); |
| 500 | } |
| 501 | |
| 502 | // Verify PKCE. |
| 503 | $expected_challenge = rtrim( strtr( base64_encode( hash( 'sha256', $code_verifier, true ) ), '+/', '-_' ), '=' ); |
| 504 | if ( !hash_equals( (string) $code_data['code_challenge'], $expected_challenge ) ) { |
| 505 | return $this->oauth_error( 'invalid_grant', 'PKCE verification failed.', 400 ); |
| 506 | } |
| 507 | |
| 508 | return $this->issue_token_pair( $client->client_id, (int) $code_data['user_id'], (string) $code_data['scope'] ); |
| 509 | } |
| 510 | |
| 511 | private function handle_token_refresh( WP_REST_Request $request ) { |
| 512 | $refresh_token = (string) ( $request->get_param( 'refresh_token' ) ?? '' ); |
| 513 | $client_id = (string) ( $request->get_param( 'client_id' ) ?? '' ); |
| 514 | if ( $refresh_token === '' ) { |
| 515 | return $this->oauth_error( 'invalid_request', 'Missing refresh_token.', 400 ); |
| 516 | } |
| 517 | |
| 518 | global $wpdb; |
| 519 | $hash = hash( 'sha256', $refresh_token ); |
| 520 | $row = $wpdb->get_row( |
| 521 | $wpdb->prepare( |
| 522 | "SELECT * FROM {$this->table_tokens} WHERE refresh_token_hash = %s AND revoked = 0 LIMIT 1", |
| 523 | $hash |
| 524 | ) |
| 525 | ); |
| 526 | if ( !$row ) { |
| 527 | return $this->oauth_error( 'invalid_grant', 'Refresh token is invalid or revoked.', 400 ); |
| 528 | } |
| 529 | if ( $row->refresh_expires && strtotime( $row->refresh_expires . ' UTC' ) < time() ) { |
| 530 | return $this->oauth_error( 'invalid_grant', 'Refresh token expired.', 400 ); |
| 531 | } |
| 532 | |
| 533 | $client = $this->get_client( $row->client_id ); |
| 534 | if ( !$client ) { |
| 535 | return $this->oauth_error( 'invalid_client', 'Client not found.', 401 ); |
| 536 | } |
| 537 | if ( $client_id !== '' && $client_id !== $client->client_id ) { |
| 538 | return $this->oauth_error( 'invalid_client', 'client_id mismatch.', 401 ); |
| 539 | } |
| 540 | if ( !$this->authenticate_client_if_required( $client, $request ) ) { |
| 541 | return $this->oauth_error( 'invalid_client', 'Client authentication failed.', 401 ); |
| 542 | } |
| 543 | |
| 544 | // Refresh-token rotation (OAuth 2.1 best practice): revoke the old grant and issue a new pair. |
| 545 | $wpdb->update( $this->table_tokens, [ 'revoked' => 1 ], [ 'id' => $row->id ] ); |
| 546 | |
| 547 | return $this->issue_token_pair( $row->client_id, (int) $row->user_id, (string) $row->scope ); |
| 548 | } |
| 549 | |
| 550 | private function issue_token_pair( $client_id, $user_id, $scope ) { |
| 551 | global $wpdb; |
| 552 | $access_token = $this->random_token( 48 ); |
| 553 | $refresh_token = $this->random_token( 48 ); |
| 554 | $now = time(); |
| 555 | |
| 556 | $wpdb->insert( $this->table_tokens, [ |
| 557 | 'client_id' => $client_id, |
| 558 | 'user_id' => $user_id, |
| 559 | 'access_token_hash' => hash( 'sha256', $access_token ), |
| 560 | 'refresh_token_hash' => hash( 'sha256', $refresh_token ), |
| 561 | 'access_expires' => gmdate( 'Y-m-d H:i:s', $now + self::ACCESS_TOKEN_TTL ), |
| 562 | 'refresh_expires' => gmdate( 'Y-m-d H:i:s', $now + self::REFRESH_TOKEN_TTL ), |
| 563 | 'scope' => $scope, |
| 564 | 'created' => gmdate( 'Y-m-d H:i:s', $now ), |
| 565 | ] ); |
| 566 | |
| 567 | $response = new WP_REST_Response( [ |
| 568 | 'access_token' => $access_token, |
| 569 | 'token_type' => 'Bearer', |
| 570 | 'expires_in' => self::ACCESS_TOKEN_TTL, |
| 571 | 'refresh_token' => $refresh_token, |
| 572 | 'scope' => $scope, |
| 573 | ], 200 ); |
| 574 | $response->header( 'Cache-Control', 'no-store' ); |
| 575 | $response->header( 'Pragma', 'no-cache' ); |
| 576 | return $response; |
| 577 | } |
| 578 | |
| 579 | private function authenticate_client_if_required( $client, WP_REST_Request $request ) { |
| 580 | if ( $client->token_endpoint_auth_method === 'none' ) { |
| 581 | return true; |
| 582 | } |
| 583 | $provided_secret = ''; |
| 584 | if ( $client->token_endpoint_auth_method === 'client_secret_basic' ) { |
| 585 | $auth = $request->get_header( 'authorization' ); |
| 586 | if ( $auth && preg_match( '#^Basic\s+(.+)$#i', $auth, $m ) ) { |
| 587 | $decoded = base64_decode( $m[1], true ); |
| 588 | if ( $decoded && strpos( $decoded, ':' ) !== false ) { |
| 589 | [ $cid, $secret ] = explode( ':', $decoded, 2 ); |
| 590 | if ( $cid === $client->client_id ) { |
| 591 | $provided_secret = $secret; |
| 592 | } |
| 593 | } |
| 594 | } |
| 595 | } |
| 596 | else { |
| 597 | $provided_secret = (string) ( $request->get_param( 'client_secret' ) ?? '' ); |
| 598 | } |
| 599 | if ( $provided_secret === '' || !$client->client_secret_hash ) { |
| 600 | return false; |
| 601 | } |
| 602 | return hash_equals( $client->client_secret_hash, hash( 'sha256', $provided_secret ) ); |
| 603 | } |
| 604 | #endregion |
| 605 | |
| 606 | #region Revocation |
| 607 | public function handle_revoke( WP_REST_Request $request ) { |
| 608 | $token = (string) ( $request->get_param( 'token' ) ?? '' ); |
| 609 | if ( $token === '' ) { |
| 610 | // RFC 7009: return 200 even on unknown tokens to avoid information leakage. |
| 611 | return new WP_REST_Response( null, 200 ); |
| 612 | } |
| 613 | global $wpdb; |
| 614 | $hash = hash( 'sha256', $token ); |
| 615 | $wpdb->query( $wpdb->prepare( |
| 616 | "UPDATE {$this->table_tokens} SET revoked = 1 WHERE access_token_hash = %s OR refresh_token_hash = %s", |
| 617 | $hash, $hash |
| 618 | ) ); |
| 619 | return new WP_REST_Response( null, 200 ); |
| 620 | } |
| 621 | #endregion |
| 622 | |
| 623 | #region Token validation (called from MCP auth path) |
| 624 | /** |
| 625 | * Validate an access token for protected resource access. |
| 626 | * Returns [ 'user_id' => N, 'client_id' => '...', 'scope' => '...' ] on success, null on failure. |
| 627 | * Also touches last_used so the admin UI can show recent activity. |
| 628 | */ |
| 629 | public function validate_token( $token ) { |
| 630 | if ( !is_string( $token ) || $token === '' ) { |
| 631 | return null; |
| 632 | } |
| 633 | global $wpdb; |
| 634 | $hash = hash( 'sha256', $token ); |
| 635 | $row = $wpdb->get_row( |
| 636 | $wpdb->prepare( |
| 637 | "SELECT * FROM {$this->table_tokens} WHERE access_token_hash = %s AND revoked = 0 LIMIT 1", |
| 638 | $hash |
| 639 | ) |
| 640 | ); |
| 641 | if ( !$row ) { |
| 642 | return null; |
| 643 | } |
| 644 | if ( strtotime( $row->access_expires . ' UTC' ) < time() ) { |
| 645 | return null; |
| 646 | } |
| 647 | // Touch last_used (non-blocking, single UPDATE). |
| 648 | $wpdb->update( |
| 649 | $this->table_tokens, |
| 650 | [ 'last_used' => current_time( 'mysql', 1 ) ], |
| 651 | [ 'id' => $row->id ] |
| 652 | ); |
| 653 | return [ |
| 654 | 'user_id' => (int) $row->user_id, |
| 655 | 'client_id' => $row->client_id, |
| 656 | 'scope' => $row->scope, |
| 657 | ]; |
| 658 | } |
| 659 | #endregion |
| 660 | |
| 661 | #region Admin: list / revoke grants |
| 662 | public function handle_apps_list() { |
| 663 | global $wpdb; |
| 664 | $rows = $wpdb->get_results( |
| 665 | "SELECT t.id, t.client_id, t.user_id, t.created, t.last_used, t.access_expires, t.refresh_expires, t.revoked, |
| 666 | c.client_name |
| 667 | FROM {$this->table_tokens} t |
| 668 | LEFT JOIN {$this->table_clients} c ON c.client_id = t.client_id |
| 669 | WHERE t.revoked = 0 |
| 670 | ORDER BY t.created DESC" |
| 671 | ); |
| 672 | $out = []; |
| 673 | foreach ( $rows as $r ) { |
| 674 | $user = get_userdata( (int) $r->user_id ); |
| 675 | $out[] = [ |
| 676 | 'id' => (int) $r->id, |
| 677 | 'client_id' => $r->client_id, |
| 678 | 'client_name' => $r->client_name ?: 'Unknown app', |
| 679 | 'user_id' => (int) $r->user_id, |
| 680 | 'user_login' => $user ? $user->user_login : 'deleted', |
| 681 | 'user_display' => $user ? $user->display_name : 'Deleted user', |
| 682 | 'created' => $r->created, |
| 683 | 'last_used' => $r->last_used, |
| 684 | 'access_expires' => $r->access_expires, |
| 685 | 'refresh_expires' => $r->refresh_expires, |
| 686 | ]; |
| 687 | } |
| 688 | return new WP_REST_Response( [ 'apps' => $out ], 200 ); |
| 689 | } |
| 690 | |
| 691 | public function handle_apps_revoke( WP_REST_Request $request ) { |
| 692 | $id = (int) $request->get_param( 'id' ); |
| 693 | if ( $id <= 0 ) { |
| 694 | return new WP_REST_Response( [ 'error' => 'Invalid id.' ], 400 ); |
| 695 | } |
| 696 | global $wpdb; |
| 697 | $wpdb->update( $this->table_tokens, [ 'revoked' => 1 ], [ 'id' => $id ] ); |
| 698 | return new WP_REST_Response( [ 'revoked' => true ], 200 ); |
| 699 | } |
| 700 | #endregion |
| 701 | |
| 702 | #region Helpers |
| 703 | private function get_client( $client_id ) { |
| 704 | if ( !is_string( $client_id ) || $client_id === '' ) { |
| 705 | return null; |
| 706 | } |
| 707 | global $wpdb; |
| 708 | return $wpdb->get_row( $wpdb->prepare( |
| 709 | "SELECT * FROM {$this->table_clients} WHERE client_id = %s LIMIT 1", |
| 710 | $client_id |
| 711 | ) ); |
| 712 | } |
| 713 | |
| 714 | private function redirect_uri_registered( $client, $redirect_uri ) { |
| 715 | if ( !$client || !is_string( $redirect_uri ) || $redirect_uri === '' ) { |
| 716 | return false; |
| 717 | } |
| 718 | $registered = json_decode( $client->redirect_uris, true ); |
| 719 | if ( !is_array( $registered ) ) { |
| 720 | return false; |
| 721 | } |
| 722 | foreach ( $registered as $uri ) { |
| 723 | if ( hash_equals( (string) $uri, $redirect_uri ) ) { |
| 724 | return true; |
| 725 | } |
| 726 | } |
| 727 | return false; |
| 728 | } |
| 729 | |
| 730 | private function append_params( $url, $params ) { |
| 731 | $sep = strpos( $url, '?' ) === false ? '?' : '&'; |
| 732 | return $url . $sep . http_build_query( $params ); |
| 733 | } |
| 734 | |
| 735 | private function random_token( $bytes = 32 ) { |
| 736 | return bin2hex( random_bytes( (int) $bytes ) ); |
| 737 | } |
| 738 | |
| 739 | private function oauth_error( $code, $description, $status = 400 ) { |
| 740 | $response = new WP_REST_Response( [ |
| 741 | 'error' => $code, |
| 742 | 'error_description' => $description, |
| 743 | ], $status ); |
| 744 | $response->header( 'Cache-Control', 'no-store' ); |
| 745 | $response->header( 'Pragma', 'no-cache' ); |
| 746 | return $response; |
| 747 | } |
| 748 | |
| 749 | /** |
| 750 | * Add WWW-Authenticate header to 401 responses on the protected MCP route, |
| 751 | * pointing clients at the resource metadata document so they can discover |
| 752 | * the authorization server automatically. |
| 753 | */ |
| 754 | public function add_www_authenticate_header( $response, $server, $request ) { |
| 755 | if ( !( $response instanceof WP_HTTP_Response ) ) { |
| 756 | return $response; |
| 757 | } |
| 758 | $route = $request instanceof WP_REST_Request ? $request->get_route() : ''; |
| 759 | if ( $route !== '/' . $this->namespace . '/http' ) { |
| 760 | return $response; |
| 761 | } |
| 762 | $status = $response->get_status(); |
| 763 | if ( $status !== 401 && $status !== 403 ) { |
| 764 | return $response; |
| 765 | } |
| 766 | $resource_metadata = rest_url( $this->namespace . '/.well-known/oauth-protected-resource' ); |
| 767 | $response->header( |
| 768 | 'WWW-Authenticate', |
| 769 | sprintf( 'Bearer realm="MCP", resource_metadata="%s"', $resource_metadata ) |
| 770 | ); |
| 771 | return $response; |
| 772 | } |
| 773 | #endregion |
| 774 | |
| 775 | #region HTML rendering (consent + error pages) |
| 776 | private function render_consent_page( $client, $params, $user ) { |
| 777 | $nonce = wp_create_nonce( self::NONCE_ACTION ); |
| 778 | $action_url = rest_url( $this->namespace . '/oauth/authorize' ); |
| 779 | $site_name = get_bloginfo( 'name' ); |
| 780 | $client_name = $client->client_name ?: 'Unnamed MCP Client'; |
| 781 | $role_label = $this->describe_user_role( $user ); |
| 782 | |
| 783 | status_header( 200 ); |
| 784 | nocache_headers(); |
| 785 | header( 'Content-Type: text/html; charset=utf-8' ); |
| 786 | |
| 787 | $hidden_fields = [ |
| 788 | 'client_id' => $params['client_id'], |
| 789 | 'redirect_uri' => $params['redirect_uri'], |
| 790 | 'state' => $params['state'], |
| 791 | 'scope' => $params['scope'], |
| 792 | 'code_challenge' => $params['code_challenge'], |
| 793 | 'code_challenge_method' => $params['code_challenge_method'], |
| 794 | '_mwai_nonce' => $nonce, |
| 795 | ]; |
| 796 | |
| 797 | echo '<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">'; |
| 798 | echo '<meta name="viewport" content="width=device-width, initial-scale=1">'; |
| 799 | echo '<title>' . esc_html( sprintf( 'Authorize %s', $client_name ) ) . '</title>'; |
| 800 | echo $this->consent_styles(); |
| 801 | echo '</head><body><main class="mwai-oauth-card">'; |
| 802 | |
| 803 | echo '<h1>Authorize this app</h1>'; |
| 804 | echo '<p class="mwai-oauth-app"><strong>' . esc_html( $client_name ) . '</strong> wants to connect to <strong>' . esc_html( $site_name ) . '</strong>.</p>'; |
| 805 | |
| 806 | echo '<div class="mwai-oauth-meta">'; |
| 807 | 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>'; |
| 808 | echo '<div><span class="mwai-oauth-label">Permissions</span><span class="mwai-oauth-value">' . esc_html( $role_label ) . '</span></div>'; |
| 809 | echo '</div>'; |
| 810 | |
| 811 | 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>'; |
| 812 | |
| 813 | echo '<form method="POST" action="' . esc_url( $action_url ) . '">'; |
| 814 | foreach ( $hidden_fields as $name => $value ) { |
| 815 | echo '<input type="hidden" name="' . esc_attr( $name ) . '" value="' . esc_attr( $value ) . '">'; |
| 816 | } |
| 817 | echo '<div class="mwai-oauth-buttons">'; |
| 818 | echo '<button type="submit" name="action" value="approve" class="mwai-oauth-approve">Approve</button>'; |
| 819 | echo '<button type="submit" name="action" value="deny" class="mwai-oauth-deny">Deny</button>'; |
| 820 | echo '</div>'; |
| 821 | echo '</form>'; |
| 822 | |
| 823 | echo '</main></body></html>'; |
| 824 | } |
| 825 | |
| 826 | private function render_error_page( $message ) { |
| 827 | status_header( 400 ); |
| 828 | nocache_headers(); |
| 829 | header( 'Content-Type: text/html; charset=utf-8' ); |
| 830 | echo '<!DOCTYPE html><html lang="en"><head><meta charset="utf-8">'; |
| 831 | echo '<title>Authorization error</title>'; |
| 832 | echo $this->consent_styles(); |
| 833 | echo '</head><body><main class="mwai-oauth-card">'; |
| 834 | echo '<h1>Authorization error</h1>'; |
| 835 | echo '<p class="mwai-oauth-note">' . esc_html( $message ) . '</p>'; |
| 836 | echo '</main></body></html>'; |
| 837 | } |
| 838 | |
| 839 | private function describe_user_role( $user ) { |
| 840 | if ( !$user || empty( $user->roles ) ) { |
| 841 | return 'No role'; |
| 842 | } |
| 843 | $role = $user->roles[0]; |
| 844 | $names = [ |
| 845 | 'administrator' => 'Administrator (full access)', |
| 846 | 'editor' => 'Editor', |
| 847 | 'author' => 'Author', |
| 848 | 'contributor' => 'Contributor', |
| 849 | 'subscriber' => 'Subscriber', |
| 850 | ]; |
| 851 | return $names[ $role ] ?? ucfirst( $role ); |
| 852 | } |
| 853 | |
| 854 | private function consent_styles() { |
| 855 | return '<style> |
| 856 | 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; } |
| 857 | .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%; } |
| 858 | .mwai-oauth-card h1 { font-size: 22px; margin: 0 0 16px; font-weight: 600; } |
| 859 | .mwai-oauth-app { font-size: 15px; line-height: 1.5; margin: 0 0 24px; } |
| 860 | .mwai-oauth-meta { background: #f7f8fa; border-radius: 8px; padding: 14px 16px; margin-bottom: 20px; } |
| 861 | .mwai-oauth-meta > div { display: flex; justify-content: space-between; align-items: baseline; padding: 6px 0; font-size: 14px; } |
| 862 | .mwai-oauth-label { color: #6b7280; } |
| 863 | .mwai-oauth-value { color: #1d2330; font-weight: 500; text-align: right; } |
| 864 | .mwai-oauth-note { font-size: 13px; color: #6b7280; line-height: 1.5; margin: 0 0 24px; } |
| 865 | .mwai-oauth-buttons { display: flex; gap: 10px; } |
| 866 | .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; } |
| 867 | .mwai-oauth-approve { background: #2271b1; color: #fff; } |
| 868 | .mwai-oauth-approve:hover { background: #135e96; } |
| 869 | .mwai-oauth-deny { background: #fff; color: #1d2330; border-color: #d0d4da; } |
| 870 | .mwai-oauth-deny:hover { background: #f1f2f5; } |
| 871 | </style>'; |
| 872 | } |
| 873 | #endregion |
| 874 | } |
| 875 |