mcp-core.php
2 days ago
mcp-oauth.php
23 hours ago
mcp-rest.php
1 month ago
mcp.conf
1 year ago
mcp.js
9 months ago
mcp.md
9 months ago
mcp.php
23 hours ago
model-audit.php
2 days ago
workspace-mock.html
2 days ago
wpai-connectors.php
2 months ago
wpai-gateway-availability.php
3 months ago
wpai-gateway-directory.php
3 months ago
wpai-gateway-image-model.php
3 months ago
wpai-gateway-model.php
3 months ago
wpai-gateway-providers.php
3 months ago
wpai-gateway.php
3 months ago
mcp.php
1289 lines
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * AI Engine MCP Server |
| 5 | * |
| 6 | * This class implements a Model Context Protocol (MCP) server for AI Engine. |
| 7 | * |
| 8 | * Current Implementation: |
| 9 | * - Works reliably with Claude App through the mcp.js relay |
| 10 | * - Works directly with Claude.ai and ChatGPT via SSE connections |
| 11 | * - Properly handles agent cancellation signals (notifications/cancelled) to free workers immediately |
| 12 | * - Uses 30-second timeout to prevent worker exhaustion from abandoned connections |
| 13 | * - Sends heartbeat signals to detect dead connections quickly |
| 14 | * - OAuth authentication flow is currently disabled due to security concerns |
| 15 | * (only static bearer tokens are supported) |
| 16 | * |
| 17 | * Connection Management: |
| 18 | * - Agents send notifications/cancelled when done, triggering immediate SSE closure |
| 19 | * - 30-second timeout ensures workers are freed even if agents forget to disconnect |
| 20 | * - Heartbeat comments (every 10s) help proxies and connection_aborted() detect dead sockets |
| 21 | * - Both the mcp.js relay and direct agent connections work reliably |
| 22 | */ |
| 23 | |
| 24 | class Meow_MWAI_Labs_MCP { |
| 25 | private $core = null; |
| 26 | private $namespace = 'mcp/v1'; |
| 27 | private $server_version = '0.0.1'; |
| 28 | private $protocol_version = '2025-06-18'; |
| 29 | private $supported_protocol_versions = [ '2024-11-05', '2025-06-18' ]; |
| 30 | private $queue_key = 'mwai_mcp_msg'; |
| 31 | private $session_id = null; |
| 32 | private $logging = false; |
| 33 | private $last_action_time = 0; |
| 34 | private $bearer_token = null; |
| 35 | private $mcp_role = 'admin'; |
| 36 | private $tool_access_levels = []; |
| 37 | // Placeholder for OAuth integration. Currently unused and kept for |
| 38 | // future implementation once the security model is revised. |
| 39 | private $oauth = null; |
| 40 | // Resolved during auth so the MCP Logs feature can attribute tool calls |
| 41 | // to a specific connector (Claude, ChatGPT, Claude Code, …) or 'bearer'. |
| 42 | // Lives on the instance for the duration of one HTTP request. |
| 43 | private $auth_client_id = null; |
| 44 | private $auth_client_name = null; |
| 45 | private $auth_method = null; // 'oauth' | 'bearer' | null |
| 46 | |
| 47 | #region Initialize |
| 48 | public function __construct( $core ) { |
| 49 | $this->core = $core; |
| 50 | |
| 51 | // Set logging based on option |
| 52 | $this->logging = $this->core->get_option( 'mcp_debug_mode', false ); |
| 53 | |
| 54 | // OAuth 2.1 with Dynamic Client Registration. Lives alongside the bearer |
| 55 | // token: bearer is for dev tools (Claude Code, scripts), OAuth is for |
| 56 | // browser-driven clients like Claude Desktop. The new module enforces |
| 57 | // strict redirect_uri matching, PKCE S256, and refresh-token rotation. |
| 58 | require_once __DIR__ . '/mcp-oauth.php'; |
| 59 | $this->oauth = new Meow_MWAI_Labs_MCP_OAuth( $core, $this ); |
| 60 | |
| 61 | add_action( 'rest_api_init', [ $this, 'rest_api_init' ] ); |
| 62 | } |
| 63 | |
| 64 | public function is_logging_enabled() { |
| 65 | return $this->logging; |
| 66 | } |
| 67 | |
| 68 | public function rest_api_init() { |
| 69 | // Load bearer token if not already loaded |
| 70 | if ( $this->bearer_token === null ) { |
| 71 | $this->bearer_token = $this->core->get_option( 'mcp_bearer_token' ); |
| 72 | } |
| 73 | $this->mcp_role = $this->core->get_option( 'mcp_role', 'admin' ); |
| 74 | |
| 75 | // Auth filter runs for both bearer token and OAuth token paths; register |
| 76 | // unconditionally so that OAuth-only deployments (no static bearer set) work. |
| 77 | static $filter_added = false; |
| 78 | if ( !$filter_added ) { |
| 79 | add_filter( 'mwai_allow_mcp', [ $this, 'auth_via_bearer_token' ], 10, 2 ); |
| 80 | $filter_added = true; |
| 81 | } |
| 82 | |
| 83 | // Extend the CORS allow-headers list for our MCP routes. The Streamable HTTP |
| 84 | // transport sends Mcp-Protocol-Version and Mcp-Session-Id on every request; |
| 85 | // WP core's default allow-list does not include them, so the browser-side |
| 86 | // preflight from claude.ai (and similar web connectors) was rejecting the |
| 87 | // actual POST and the client reported "Couldn't reach the MCP server". |
| 88 | add_filter( 'rest_allowed_cors_headers', function ( $headers ) { |
| 89 | $uri = isset( $_SERVER['REQUEST_URI'] ) ? (string) $_SERVER['REQUEST_URI'] : ''; |
| 90 | if ( strpos( $uri, '/' . $this->namespace . '/' ) === false ) { |
| 91 | return $headers; |
| 92 | } |
| 93 | foreach ( [ 'Mcp-Protocol-Version', 'Mcp-Session-Id', 'Accept' ] as $h ) { |
| 94 | if ( !in_array( $h, $headers, true ) ) { |
| 95 | $headers[] = $h; |
| 96 | } |
| 97 | } |
| 98 | return $headers; |
| 99 | } ); |
| 100 | |
| 101 | // Streamable HTTP endpoint (modern MCP transport). Always registered when |
| 102 | // the MCP module is enabled — auth is enforced by can_access_mcp(), which |
| 103 | // accepts either a bearer token or an OAuth access token. |
| 104 | register_rest_route( $this->namespace, '/http', [ |
| 105 | 'methods' => [ 'GET', 'POST', 'DELETE' ], |
| 106 | 'callback' => [ $this, 'handle_streamable_http' ], |
| 107 | 'permission_callback' => function ( $request ) { |
| 108 | return $this->can_access_mcp( $request ); |
| 109 | }, |
| 110 | 'show_in_index' => false, |
| 111 | ] ); |
| 112 | |
| 113 | // Alternative endpoint with bearer token embedded in URL path, for clients |
| 114 | // that cannot send Authorization headers. Only registered when a bearer |
| 115 | // token is configured. The token is high-entropy (wp_generate_password), |
| 116 | // compared with hash_equals, and the route is hidden (show_in_index=false). |
| 117 | // Kept because Claude Code and other MCP connectors currently work more |
| 118 | // reliably this way when proxies strip the Authorization header. |
| 119 | // TODO: Re-evaluate after 2026-12-27. Check whether connectors still need |
| 120 | // the URL-token fallback, or if header/OAuth auth has become reliable enough |
| 121 | // to deprecate it (flagged by WP.org automated security review, Jun 2026). |
| 122 | if ( !empty( $this->bearer_token ) ) { |
| 123 | register_rest_route( $this->namespace, '/' . $this->bearer_token, [ |
| 124 | 'methods' => [ 'GET', 'POST', 'DELETE' ], |
| 125 | 'callback' => [ $this, 'handle_streamable_http' ], |
| 126 | 'permission_callback' => function ( $request ) { |
| 127 | return $this->handle_noauth_access_streamable( $request ); |
| 128 | }, |
| 129 | 'show_in_index' => false, |
| 130 | ] ); |
| 131 | } |
| 132 | |
| 133 | // File upload endpoint for wp_upload_request |
| 134 | // Uses a one-time token in the URL for authentication (no bearer header needed from curl) |
| 135 | register_rest_route( $this->namespace, '/upload/(?P<token>[a-zA-Z0-9]+)', [ |
| 136 | 'methods' => 'POST', |
| 137 | 'callback' => [ $this, 'handle_upload' ], |
| 138 | 'permission_callback' => '__return_true', |
| 139 | 'show_in_index' => false, |
| 140 | ] ); |
| 141 | } |
| 142 | #endregion |
| 143 | |
| 144 | #region Auth (Bearer token) |
| 145 | /** |
| 146 | * SECURITY: MCP provides powerful WordPress management capabilities, so access must be strictly controlled. |
| 147 | * |
| 148 | * By default, only administrators can access MCP endpoints. This prevents lower-privileged users |
| 149 | * (subscribers, contributors, etc.) from executing dangerous operations like creating admin users, |
| 150 | * deleting content, or modifying settings. |
| 151 | * |
| 152 | * When a bearer token is configured, it overrides the default admin check, but access is DENIED |
| 153 | * unless a valid token is provided. This ensures MCP is secure even with default settings. |
| 154 | */ |
| 155 | public function can_access_mcp( $request ) { |
| 156 | // Default to requiring administrator capability for security. Checked via |
| 157 | // manage_options rather than the 'administrator' role name, so that |
| 158 | // admin-equivalent accounts (custom roles, individually granted caps) are |
| 159 | // not locked out. Same reasoning as user_can_authorize() in mcp-oauth.php. |
| 160 | $is_admin = current_user_can( 'manage_options' ); |
| 161 | return apply_filters( 'mwai_allow_mcp', $is_admin, $request ); |
| 162 | } |
| 163 | |
| 164 | public function auth_via_bearer_token( $allow, $request ) { |
| 165 | // Skip if already authenticated as admin |
| 166 | if ( $allow ) { |
| 167 | return $allow; |
| 168 | } |
| 169 | |
| 170 | $hdr = $request->get_header( 'authorization' ); |
| 171 | |
| 172 | // If no authorization header but bearer token is configured, deny access |
| 173 | if ( !$hdr && !empty( $this->bearer_token ) ) { |
| 174 | if ( $this->logging ) { |
| 175 | error_log( '[AI Engine MCP] ❌ No authorization header provided. Server may be stripping headers.' ); |
| 176 | } |
| 177 | return false; |
| 178 | } |
| 179 | |
| 180 | // Check for Bearer token in header |
| 181 | if ( $hdr && preg_match( '/Bearer\s+(.+)/i', $hdr, $m ) ) { |
| 182 | $token = trim( $m[1] ); |
| 183 | $auth_result = 'none'; |
| 184 | |
| 185 | // Check if it's an OAuth token |
| 186 | if ( $this->oauth ) { |
| 187 | $token_data = $this->oauth->validate_token( $token ); |
| 188 | if ( $token_data ) { |
| 189 | // Defense in depth: even if a token was issued (or stored from before |
| 190 | // the authorize-time admin gate landed), only accept it if the linked |
| 191 | // user still holds administrator capability. Otherwise a Subscriber's |
| 192 | // OAuth token would inherit the global mcp_role and reach admin tools. |
| 193 | if ( !$this->oauth->user_can_authorize( $token_data['user_id'] ) ) { |
| 194 | if ( $this->logging ) { |
| 195 | error_log( '[AI Engine MCP] ❌ OAuth token rejected: user ' . $token_data['user_id'] . ' is not an administrator.' ); |
| 196 | } |
| 197 | return false; |
| 198 | } |
| 199 | // Set current user based on OAuth token |
| 200 | wp_set_current_user( $token_data['user_id'] ); |
| 201 | $auth_result = 'oauth'; |
| 202 | $this->auth_method = 'oauth'; |
| 203 | $this->auth_client_id = $token_data['client_id'] ?? null; |
| 204 | $this->auth_client_name = $token_data['client_name'] ?? null; |
| 205 | return true; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | // Fall back to static bearer token if configured |
| 210 | if ( !empty( $this->bearer_token ) && hash_equals( $this->bearer_token, $token ) ) { |
| 211 | if ( $admin = $this->core->get_admin_user() ) { |
| 212 | wp_set_current_user( $admin->ID, $admin->user_login ); |
| 213 | } |
| 214 | $auth_result = 'static'; |
| 215 | $this->auth_method = 'bearer'; |
| 216 | $this->auth_client_id = 'bearer'; |
| 217 | $this->auth_client_name = null; |
| 218 | if ( $this->logging ) { |
| 219 | error_log( '[AI Engine MCP] 🔐 Bearer token auth OK' ); |
| 220 | } |
| 221 | return true; |
| 222 | } |
| 223 | |
| 224 | if ( $this->logging && $auth_result === 'none' ) { |
| 225 | error_log( '[AI Engine MCP] ❌ Bearer token invalid.' ); |
| 226 | } |
| 227 | // Explicitly deny access for invalid tokens |
| 228 | return false; |
| 229 | } |
| 230 | |
| 231 | // ?token=xyz fallback (optional) - only for static bearer token |
| 232 | if ( !empty( $this->bearer_token ) ) { |
| 233 | $q = sanitize_text_field( $request->get_param( 'token' ) ); |
| 234 | if ( $q && hash_equals( $this->bearer_token, $q ) ) { |
| 235 | if ( $admin = $this->core->get_admin_user() ) { |
| 236 | wp_set_current_user( $admin->ID, $admin->user_login ); |
| 237 | } |
| 238 | $this->auth_method = 'bearer'; |
| 239 | $this->auth_client_id = 'bearer'; |
| 240 | return true; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | // If bearer token is configured but no valid auth provided, deny access |
| 245 | if ( !empty( $this->bearer_token ) ) { |
| 246 | return false; |
| 247 | } |
| 248 | |
| 249 | return $allow; |
| 250 | } |
| 251 | |
| 252 | public function handle_noauth_access_streamable( $request ) { |
| 253 | // For Streamable HTTP with token in URL path (no trailing slash) |
| 254 | $route = $request->get_route(); |
| 255 | $expected = '/' . $this->namespace . '/' . $this->bearer_token; |
| 256 | if ( $route !== $expected ) { |
| 257 | if ( $this->logging ) { |
| 258 | error_log( '[AI Engine MCP] ❌ Invalid Streamable HTTP no-auth URL access attempt.' ); |
| 259 | } |
| 260 | return false; |
| 261 | } |
| 262 | |
| 263 | // Set the current user to admin since token is valid |
| 264 | if ( $admin = $this->core->get_admin_user() ) { |
| 265 | wp_set_current_user( $admin->ID, $admin->user_login ); |
| 266 | } |
| 267 | $this->auth_method = 'bearer'; |
| 268 | $this->auth_client_id = 'bearer'; |
| 269 | return true; |
| 270 | } |
| 271 | |
| 272 | #endregion |
| 273 | |
| 274 | #region Helpers (log / JSON-RPC utils) |
| 275 | /** |
| 276 | * Release the PHP session lock as early as possible. Long MCP calls (e.g. content |
| 277 | * mutations on large posts) can otherwise serialize behind any other request from the |
| 278 | * same client that opened a session, since PHP holds an exclusive write lock on the |
| 279 | * session file for the lifetime of the request. The result is the ~max_execution_time |
| 280 | * hangs operators see on busy sites. Closing the session is idempotent and safe — if |
| 281 | * no session is active the call is a no-op. |
| 282 | */ |
| 283 | private function release_session_lock(): void { |
| 284 | if ( function_exists( 'session_status' ) && session_status() === PHP_SESSION_ACTIVE ) { |
| 285 | session_write_close(); |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | private function log( $msg ) { |
| 290 | // This method is for internal UI logs - keep it minimal |
| 291 | if ( $this->logging ) { |
| 292 | // Only log important messages to UI |
| 293 | if ( strpos( $msg, 'queued' ) === false && strpos( $msg, 'flush' ) === false ) { |
| 294 | Meow_MWAI_Logging::log( "[AI Engine MCP] {$msg}" ); |
| 295 | } |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | /** Wrap a JSON-RPC error object */ |
| 300 | private function rpc_error( $id, int $code, string $msg, $extra = null ): array { |
| 301 | $err = [ 'code' => $code, 'message' => $msg ]; |
| 302 | if ( $extra !== null ) { |
| 303 | $err['data'] = $extra; |
| 304 | } |
| 305 | return [ 'jsonrpc' => '2.0', 'id' => $id, 'error' => $err ]; |
| 306 | } |
| 307 | |
| 308 | /** Format tool result for MCP protocol */ |
| 309 | private function format_tool_result( $result ): array { |
| 310 | // If result is a string, wrap it in the MCP content format |
| 311 | if ( is_string( $result ) ) { |
| 312 | return [ |
| 313 | 'content' => [ |
| 314 | [ |
| 315 | 'type' => 'text', |
| 316 | 'text' => $result, |
| 317 | ], |
| 318 | ], |
| 319 | ]; |
| 320 | } |
| 321 | |
| 322 | // If result has 'content' key, assume it's already properly formatted |
| 323 | if ( is_array( $result ) && isset( $result['content'] ) ) { |
| 324 | return $result; |
| 325 | } |
| 326 | |
| 327 | // If result is an array without 'content' key, wrap it as JSON |
| 328 | if ( is_array( $result ) ) { |
| 329 | return [ |
| 330 | 'content' => [ |
| 331 | [ |
| 332 | 'type' => 'text', |
| 333 | 'text' => wp_json_encode( $result, JSON_PRETTY_PRINT ), |
| 334 | ], |
| 335 | ], |
| 336 | 'data' => $result, |
| 337 | ]; |
| 338 | } |
| 339 | |
| 340 | // For any other type, convert to string and wrap |
| 341 | return [ |
| 342 | 'content' => [ |
| 343 | [ |
| 344 | 'type' => 'text', |
| 345 | 'text' => (string) $result, |
| 346 | ], |
| 347 | ], |
| 348 | ]; |
| 349 | } |
| 350 | #endregion |
| 351 | |
| 352 | #region Handle direct JSON-RPC |
| 353 | /** |
| 354 | * Shared JSON-RPC processor: takes a decoded request body, dispatches the method, |
| 355 | * and returns an immediate WP_REST_Response. Used by the Streamable HTTP POST handler |
| 356 | * (the modern transport for Claude Desktop, Claude.ai, ChatGPT, Claude Code). |
| 357 | */ |
| 358 | private function handle_direct_jsonrpc( WP_REST_Request $request, $data ) { |
| 359 | $this->release_session_lock(); |
| 360 | $id = $data['id'] ?? null; |
| 361 | $method = $data['method'] ?? null; |
| 362 | |
| 363 | if ( json_last_error() !== JSON_ERROR_NONE ) { |
| 364 | $response = new WP_REST_Response( [ |
| 365 | 'jsonrpc' => '2.0', |
| 366 | 'id' => null, |
| 367 | 'error' => [ 'code' => -32700, 'message' => 'Parse error: invalid JSON' ] |
| 368 | ], 200 ); |
| 369 | $response->set_headers( [ 'Content-Type' => 'application/json' ] ); |
| 370 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 371 | if ( !empty( $session_header ) ) { |
| 372 | return $this->attach_session_header( $response, sanitize_text_field( $session_header ) ); |
| 373 | } |
| 374 | return $response; |
| 375 | } |
| 376 | |
| 377 | if ( !is_array( $data ) || !$method ) { |
| 378 | $response = new WP_REST_Response( [ |
| 379 | 'jsonrpc' => '2.0', |
| 380 | 'id' => $id, |
| 381 | 'error' => [ 'code' => -32600, 'message' => 'Invalid Request' ] |
| 382 | ], 200 ); |
| 383 | $response->set_headers( [ 'Content-Type' => 'application/json' ] ); |
| 384 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 385 | if ( !empty( $session_header ) ) { |
| 386 | return $this->attach_session_header( $response, sanitize_text_field( $session_header ) ); |
| 387 | } |
| 388 | return $response; |
| 389 | } |
| 390 | |
| 391 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 392 | $session_id = ''; |
| 393 | if ( !empty( $session_header ) ) { |
| 394 | $session_id = sanitize_text_field( $session_header ); |
| 395 | } |
| 396 | |
| 397 | if ( $method === 'initialize' || empty( $session_id ) ) { |
| 398 | $session_id = wp_generate_uuid4(); |
| 399 | if ( $this->logging ) { |
| 400 | error_log( '[AI Engine MCP] 🆔 Direct session initialized: ' . $session_id ); |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | try { |
| 405 | $reply = null; |
| 406 | |
| 407 | switch ( $method ) { |
| 408 | case 'initialize': |
| 409 | // Check if client requests a specific protocol version |
| 410 | $params = $data['params'] ?? []; |
| 411 | $requested_version = $params['protocolVersion'] ?? null; |
| 412 | $client_info = $params['clientInfo'] ?? null; |
| 413 | |
| 414 | if ( $this->logging && $client_info ) { |
| 415 | $client_name = $client_info['name'] ?? 'unknown'; |
| 416 | $client_version = $client_info['version'] ?? 'unknown'; |
| 417 | error_log( "[AI Engine MCP] Client: {$client_name} v{$client_version}" ); |
| 418 | } |
| 419 | |
| 420 | // Negotiate protocol version: use client's version if supported |
| 421 | $negotiated_version = $this->protocol_version; |
| 422 | if ( $requested_version && in_array( $requested_version, $this->supported_protocol_versions, true ) ) { |
| 423 | $negotiated_version = $requested_version; |
| 424 | } |
| 425 | else if ( $requested_version && $requested_version !== $this->protocol_version ) { |
| 426 | if ( $this->logging ) { |
| 427 | Meow_MWAI_Logging::warn( "[AI Engine MCP] Client requested unsupported protocol version {$requested_version}" ); |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | $reply = [ |
| 432 | 'jsonrpc' => '2.0', |
| 433 | 'id' => $id, |
| 434 | 'result' => [ |
| 435 | 'protocolVersion' => $negotiated_version, |
| 436 | 'serverInfo' => (object) [ |
| 437 | 'name' => 'AI Engine - ' . get_bloginfo( 'name' ), |
| 438 | 'version' => $this->server_version, |
| 439 | ], |
| 440 | 'capabilities' => (object) [ |
| 441 | 'tools' => new stdClass(), |
| 442 | ], |
| 443 | ], |
| 444 | ]; |
| 445 | break; |
| 446 | |
| 447 | case 'tools/list': |
| 448 | $tools = $this->get_tools_list(); |
| 449 | |
| 450 | // Debug logging for tools/list |
| 451 | if ( $this->logging ) { |
| 452 | $user_agent = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : 'unknown'; |
| 453 | error_log( '[AI Engine MCP Direct] 📋 tools/list requested by: ' . $user_agent ); |
| 454 | error_log( '[AI Engine MCP Direct] 📊 Returning ' . count( $tools ) . ' tools' ); |
| 455 | if ( count( $tools ) > 0 ) { |
| 456 | $tool_names = array_column( $tools, 'name' ); |
| 457 | error_log( '[AI Engine MCP Direct] 🛠️ Tool names: ' . implode( ', ', $tool_names ) ); |
| 458 | } |
| 459 | else { |
| 460 | error_log( '[AI Engine MCP Direct] ⚠️ WARNING: No tools returned!' ); |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | $reply = [ |
| 465 | 'jsonrpc' => '2.0', |
| 466 | 'id' => $id, |
| 467 | 'result' => [ 'tools' => $tools ], |
| 468 | ]; |
| 469 | break; |
| 470 | |
| 471 | case 'tools/call': |
| 472 | $params = $data['params'] ?? []; |
| 473 | $tool = $params['name'] ?? ''; |
| 474 | $arguments = $params['arguments'] ?? []; |
| 475 | |
| 476 | if ( $this->logging ) { |
| 477 | error_log( '[AI Engine MCP Direct] 🔧 tools/call - Tool: ' . $tool ); |
| 478 | error_log( '[AI Engine MCP Direct] 🔧 tools/call - Arguments: ' . wp_json_encode( $arguments ) ); |
| 479 | } |
| 480 | |
| 481 | try { |
| 482 | $reply = $this->execute_tool( $tool, $arguments, $id ); |
| 483 | if ( $this->logging ) { |
| 484 | error_log( '[AI Engine MCP Direct] � |
| 485 | tools/call - Success for tool: ' . $tool ); |
| 486 | } |
| 487 | } |
| 488 | catch ( Exception $e ) { |
| 489 | if ( $this->logging ) { |
| 490 | error_log( '[AI Engine MCP Direct] ❌ tools/call - Error: ' . $e->getMessage() ); |
| 491 | } |
| 492 | throw $e; |
| 493 | } |
| 494 | break; |
| 495 | |
| 496 | case 'notifications/initialized': |
| 497 | // This is a notification from the client indicating it has initialized |
| 498 | // No response needed for notifications |
| 499 | // Client initialized - no need to log |
| 500 | return $this->attach_session_header( new WP_REST_Response( null, 204 ), $session_id ); |
| 501 | break; |
| 502 | |
| 503 | default: |
| 504 | // Check if it's a notification (no id) |
| 505 | if ( $id === null && strpos( $method, 'notifications/' ) === 0 ) { |
| 506 | if ( $this->logging ) { |
| 507 | error_log( '[AI Engine MCP] 📨 Notification received: ' . $method ); |
| 508 | } |
| 509 | return $this->attach_session_header( new WP_REST_Response( null, 204 ), $session_id ); |
| 510 | } |
| 511 | |
| 512 | $reply = [ |
| 513 | 'jsonrpc' => '2.0', |
| 514 | 'id' => $id, |
| 515 | 'error' => [ 'code' => -32601, 'message' => "Method not found: {$method}" ] |
| 516 | ]; |
| 517 | } |
| 518 | |
| 519 | // Ensure proper JSON-RPC response |
| 520 | $response = new WP_REST_Response( $reply, 200 ); |
| 521 | $response->set_headers( [ 'Content-Type' => 'application/json' ] ); |
| 522 | return $this->attach_session_header( $response, $session_id ); |
| 523 | |
| 524 | } |
| 525 | catch ( Throwable $e ) { |
| 526 | if ( $this->logging ) { |
| 527 | error_log( '[AI Engine MCP] ❌ Exception in handle_direct_jsonrpc: ' . $e->getMessage() ); |
| 528 | } |
| 529 | |
| 530 | $error_response = new WP_REST_Response( [ |
| 531 | 'jsonrpc' => '2.0', |
| 532 | 'id' => $id, |
| 533 | 'error' => [ 'code' => -32603, 'message' => 'Internal error', 'data' => $e->getMessage() ] |
| 534 | ], 200 ); |
| 535 | $error_response->set_headers( [ 'Content-Type' => 'application/json' ] ); |
| 536 | return $this->attach_session_header( $error_response, $session_id ); |
| 537 | } |
| 538 | } |
| 539 | #endregion |
| 540 | |
| 541 | #region Session helpers |
| 542 | private function attach_session_header( WP_REST_Response $response, string $session_id ) { |
| 543 | if ( empty( $session_id ) ) { |
| 544 | return $response; |
| 545 | } |
| 546 | |
| 547 | $response->header( 'Mcp-Session-Id', $session_id ); |
| 548 | |
| 549 | if ( $this->logging ) { |
| 550 | error_log( '[AI Engine MCP] 🪪 Response session header: ' . $session_id ); |
| 551 | } |
| 552 | |
| 553 | return $response; |
| 554 | } |
| 555 | #endregion |
| 556 | |
| 557 | #region Handle Streamable HTTP (Modern MCP transport) |
| 558 | /** |
| 559 | * Handle Streamable HTTP requests per MCP specification. |
| 560 | * This is the modern transport used by Claude Code and other MCP clients. |
| 561 | * |
| 562 | * - POST: Send JSON-RPC request, receive JSON response (or SSE for streaming) |
| 563 | * - GET: Open SSE stream for server-initiated messages |
| 564 | * - DELETE: Terminate the session |
| 565 | * |
| 566 | * @see https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#streamable-http |
| 567 | */ |
| 568 | public function handle_streamable_http( WP_REST_Request $request ) { |
| 569 | $method = $request->get_method(); |
| 570 | |
| 571 | switch ( $method ) { |
| 572 | case 'POST': |
| 573 | return $this->handle_streamable_http_post( $request ); |
| 574 | |
| 575 | case 'GET': |
| 576 | return $this->handle_streamable_http_get( $request ); |
| 577 | |
| 578 | case 'DELETE': |
| 579 | return $this->handle_streamable_http_delete( $request ); |
| 580 | |
| 581 | default: |
| 582 | return new WP_REST_Response( [ |
| 583 | 'error' => 'Method not allowed' |
| 584 | ], 405 ); |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | /** |
| 589 | * Handle POST requests for Streamable HTTP. |
| 590 | * This processes JSON-RPC requests and returns JSON responses. |
| 591 | */ |
| 592 | private function handle_streamable_http_post( WP_REST_Request $request ) { |
| 593 | $this->release_session_lock(); |
| 594 | $raw_body = $request->get_body(); |
| 595 | |
| 596 | if ( empty( $raw_body ) ) { |
| 597 | return new WP_REST_Response( [ |
| 598 | 'jsonrpc' => '2.0', |
| 599 | 'id' => null, |
| 600 | 'error' => [ 'code' => -32700, 'message' => 'Parse error: empty body' ] |
| 601 | ], 400 ); |
| 602 | } |
| 603 | |
| 604 | $data = json_decode( $raw_body, true ); |
| 605 | |
| 606 | if ( json_last_error() !== JSON_ERROR_NONE ) { |
| 607 | return new WP_REST_Response( [ |
| 608 | 'jsonrpc' => '2.0', |
| 609 | 'id' => null, |
| 610 | 'error' => [ 'code' => -32700, 'message' => 'Parse error: invalid JSON' ] |
| 611 | ], 400 ); |
| 612 | } |
| 613 | |
| 614 | // Log the request if debugging is enabled |
| 615 | if ( $this->logging && isset( $data['method'] ) ) { |
| 616 | error_log( '[AI Engine MCP HTTP] ↓ ' . $data['method'] ); |
| 617 | } |
| 618 | |
| 619 | // Reuse the existing direct JSON-RPC handler |
| 620 | return $this->handle_direct_jsonrpc( $request, $data ); |
| 621 | } |
| 622 | |
| 623 | /** |
| 624 | * Handle GET requests for Streamable HTTP. |
| 625 | * This opens an SSE stream for server-to-client messages. |
| 626 | * Used when the server needs to send notifications or progress updates. |
| 627 | */ |
| 628 | private function handle_streamable_http_get( WP_REST_Request $request ) { |
| 629 | // Check Accept header - must accept text/event-stream |
| 630 | $accept = $request->get_header( 'accept' ); |
| 631 | if ( strpos( $accept, 'text/event-stream' ) === false ) { |
| 632 | return new WP_REST_Response( [ |
| 633 | 'error' => 'Accept header must include text/event-stream' |
| 634 | ], 406 ); |
| 635 | } |
| 636 | |
| 637 | // Get or create session ID |
| 638 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 639 | $session_id = !empty( $session_header ) ? sanitize_text_field( $session_header ) : wp_generate_uuid4(); |
| 640 | |
| 641 | if ( $this->logging ) { |
| 642 | error_log( '[AI Engine MCP HTTP] 📡 SSE stream opened for session: ' . substr( $session_id, 0, 8 ) . '...' ); |
| 643 | } |
| 644 | |
| 645 | // Set up SSE output |
| 646 | @ini_set( 'zlib.output_compression', '0' ); |
| 647 | @ini_set( 'output_buffering', '0' ); |
| 648 | @ini_set( 'implicit_flush', '1' ); |
| 649 | if ( function_exists( 'ob_implicit_flush' ) ) { |
| 650 | ob_implicit_flush( true ); |
| 651 | } |
| 652 | |
| 653 | header( 'Content-Type: text/event-stream' ); |
| 654 | header( 'Cache-Control: no-cache' ); |
| 655 | header( 'X-Accel-Buffering: no' ); |
| 656 | header( 'Connection: keep-alive' ); |
| 657 | header( 'Mcp-Session-Id: ' . $session_id ); |
| 658 | |
| 659 | while ( ob_get_level() ) { |
| 660 | ob_end_flush(); |
| 661 | } |
| 662 | |
| 663 | $this->session_id = $session_id; |
| 664 | $this->last_action_time = time(); |
| 665 | |
| 666 | // Send initial connection event |
| 667 | echo "event: open\n"; |
| 668 | echo 'data: {"session":"' . esc_js( $session_id ) . "\"}\n\n"; |
| 669 | flush(); |
| 670 | |
| 671 | // Main SSE loop - listen for server-initiated messages |
| 672 | while ( true ) { |
| 673 | $max_time = $this->logging ? 30 : 60 * 3; |
| 674 | $idle = ( time() - $this->last_action_time ) >= $max_time; |
| 675 | |
| 676 | if ( connection_aborted() || $idle ) { |
| 677 | if ( $this->logging ) { |
| 678 | error_log( '[AI Engine MCP HTTP] 🔚 SSE closed (' . ( $idle ? 'idle' : 'abort' ) . ')' ); |
| 679 | } |
| 680 | break; |
| 681 | } |
| 682 | |
| 683 | // Check for queued messages |
| 684 | foreach ( $this->fetch_messages( $session_id ) as $msg ) { |
| 685 | if ( isset( $msg['method'] ) && $msg['method'] === 'mwai/kill' ) { |
| 686 | echo "event: close\ndata: {}\n\n"; |
| 687 | flush(); |
| 688 | exit; |
| 689 | } |
| 690 | |
| 691 | echo "event: message\n"; |
| 692 | echo 'data: ' . wp_json_encode( $msg, JSON_UNESCAPED_UNICODE ) . "\n\n"; |
| 693 | flush(); |
| 694 | $this->last_action_time = time(); |
| 695 | } |
| 696 | |
| 697 | // Heartbeat every 10 seconds |
| 698 | $time_since_last = time() - $this->last_action_time; |
| 699 | if ( $time_since_last >= 10 && $time_since_last % 10 === 0 ) { |
| 700 | echo ": heartbeat\n\n"; |
| 701 | flush(); |
| 702 | } |
| 703 | |
| 704 | usleep( 200000 ); // 200ms |
| 705 | } |
| 706 | |
| 707 | exit; |
| 708 | } |
| 709 | |
| 710 | /** |
| 711 | * Handle DELETE requests for Streamable HTTP. |
| 712 | * This terminates the session and cleans up any resources. |
| 713 | */ |
| 714 | private function handle_streamable_http_delete( WP_REST_Request $request ) { |
| 715 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 716 | |
| 717 | if ( empty( $session_header ) ) { |
| 718 | return new WP_REST_Response( [ |
| 719 | 'error' => 'Mcp-Session-Id header required' |
| 720 | ], 400 ); |
| 721 | } |
| 722 | |
| 723 | $session_id = sanitize_text_field( $session_header ); |
| 724 | |
| 725 | if ( $this->logging ) { |
| 726 | error_log( '[AI Engine MCP HTTP] 🗑️ Session terminated: ' . substr( $session_id, 0, 8 ) . '...' ); |
| 727 | } |
| 728 | |
| 729 | // Queue kill signal for any active SSE streams |
| 730 | $this->store_message( $session_id, [ |
| 731 | 'jsonrpc' => '2.0', |
| 732 | 'method' => 'mwai/kill' |
| 733 | ] ); |
| 734 | |
| 735 | // Clean up any remaining transients for this session |
| 736 | global $wpdb; |
| 737 | $like = $wpdb->esc_like( '_transient_' . "{$this->queue_key}_{$session_id}_" ) . '%'; |
| 738 | $wpdb->query( |
| 739 | $wpdb->prepare( |
| 740 | "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s", |
| 741 | $like |
| 742 | ) |
| 743 | ); |
| 744 | |
| 745 | // Return 204 No Content on successful termination |
| 746 | return new WP_REST_Response( null, 204 ); |
| 747 | } |
| 748 | #endregion |
| 749 | |
| 750 | #region Access Control |
| 751 | private function role_has_access( string $toolLevel ): bool { |
| 752 | if ( $this->mcp_role === 'admin' ) { |
| 753 | return true; |
| 754 | } |
| 755 | if ( $this->mcp_role === 'readwrite' ) { |
| 756 | return in_array( $toolLevel, [ 'read', 'write' ] ); |
| 757 | } |
| 758 | if ( $this->mcp_role === 'readonly' ) { |
| 759 | return $toolLevel === 'read'; |
| 760 | } |
| 761 | return false; |
| 762 | } |
| 763 | #endregion |
| 764 | |
| 765 | #region Tools Definitions |
| 766 | private function get_tools_list() { |
| 767 | $base_tools = [ |
| 768 | [ |
| 769 | 'name' => 'mcp_ping', |
| 770 | 'description' => 'Simple connectivity check. Returns the current GMT time and the WordPress site name. Whenever a tool call fails (error or timeout), immediately invoke mcp_ping to verify the server; if mcp_ping itself does not respond, assume the server is temporarily unreachable and pause additional tool calls.', |
| 771 | 'inputSchema' => [ |
| 772 | 'type' => 'object', |
| 773 | 'properties' => (object) [], |
| 774 | 'required' => [] |
| 775 | ], |
| 776 | 'annotations' => [ |
| 777 | 'readOnlyHint' => true, |
| 778 | 'destructiveHint' => false, |
| 779 | 'openWorldHint' => false, |
| 780 | ], |
| 781 | 'accessLevel' => 'read', |
| 782 | ], |
| 783 | ]; |
| 784 | |
| 785 | if ( $this->logging ) { |
| 786 | error_log( '[AI Engine MCP] 🔧 get_tools_list() - Starting with ' . count( $base_tools ) . ' base tools' ); |
| 787 | } |
| 788 | |
| 789 | $filtered_tools = apply_filters( 'mwai_mcp_tools', $base_tools ); |
| 790 | |
| 791 | if ( $this->logging ) { |
| 792 | error_log( '[AI Engine MCP] 🔧 get_tools_list() - After filters: ' . count( $filtered_tools ) . ' tools' ); |
| 793 | } |
| 794 | |
| 795 | // Build access level map for defense-in-depth checks in execute_tool() |
| 796 | foreach ( $filtered_tools as $tool ) { |
| 797 | if ( isset( $tool['name'] ) ) { |
| 798 | $this->tool_access_levels[ $tool['name'] ] = $tool['accessLevel'] ?? 'admin'; |
| 799 | } |
| 800 | } |
| 801 | |
| 802 | // Filter tools by access level based on the MCP role |
| 803 | if ( $this->mcp_role !== 'admin' ) { |
| 804 | $filtered_tools = array_filter( $filtered_tools, function ( $tool ) { |
| 805 | $level = $tool['accessLevel'] ?? 'admin'; |
| 806 | return $this->role_has_access( $level ); |
| 807 | } ); |
| 808 | } |
| 809 | |
| 810 | $normalized_tools = []; |
| 811 | foreach ( $filtered_tools as $tool_index => $tool_definition ) { |
| 812 | $normalized = $this->normalize_tool_definition( $tool_definition, $tool_index ); |
| 813 | if ( $normalized ) { |
| 814 | $normalized_tools[] = $normalized; |
| 815 | } |
| 816 | } |
| 817 | |
| 818 | if ( $this->logging ) { |
| 819 | error_log( '[AI Engine MCP] 🔧 get_tools_list() - Normalized tools: ' . count( $normalized_tools ) ); |
| 820 | } |
| 821 | |
| 822 | return $normalized_tools; |
| 823 | } |
| 824 | #endregion |
| 825 | |
| 826 | #region Resources Definitions |
| 827 | private function get_resources_list() { |
| 828 | return []; |
| 829 | } |
| 830 | #endregion |
| 831 | |
| 832 | #region Prompts Definitions |
| 833 | private function get_prompts_list() { |
| 834 | return []; |
| 835 | } |
| 836 | #endregion |
| 837 | |
| 838 | #region Tool Normalization Helpers |
| 839 | private function normalize_tool_definition( $tool, $index ) { |
| 840 | // NOTE: tool-registration warnings below are always emitted (no $this->logging |
| 841 | // gate). Each fires only when a tool is silently auto-fixed or auto-skipped at |
| 842 | // registration — exactly the case where the author needs to know. They're rare |
| 843 | // in normal operation and the only reliable diagnostic when something is off. |
| 844 | if ( !is_array( $tool ) ) { |
| 845 | error_log( '[AI Engine MCP] ⚠️ Tool definition at index ' . $index . ' skipped (expected array).' ); |
| 846 | return null; |
| 847 | } |
| 848 | |
| 849 | $name = isset( $tool['name'] ) ? trim( (string) $tool['name'] ) : ''; |
| 850 | if ( $name === '' ) { |
| 851 | error_log( '[AI Engine MCP] ⚠️ Tool skipped due to missing name at index ' . $index ); |
| 852 | return null; |
| 853 | } |
| 854 | |
| 855 | $normalized_schema = $this->normalize_input_schema( $tool['inputSchema'] ?? null, $name ); |
| 856 | if ( !$normalized_schema ) { |
| 857 | error_log( '[AI Engine MCP] ⚠️ Tool "' . $name . '" skipped due to invalid input schema.' ); |
| 858 | return null; |
| 859 | } |
| 860 | |
| 861 | $normalized = [ |
| 862 | 'name' => $name, |
| 863 | 'inputSchema' => $normalized_schema, |
| 864 | ]; |
| 865 | |
| 866 | if ( isset( $tool['description'] ) && $tool['description'] !== '' ) { |
| 867 | $normalized['description'] = wp_strip_all_tags( (string) $tool['description'] ); |
| 868 | } |
| 869 | |
| 870 | if ( isset( $tool['annotations'] ) && is_array( $tool['annotations'] ) ) { |
| 871 | $annotations = $this->normalize_annotations( $tool['annotations'], $name ); |
| 872 | if ( !empty( $annotations ) ) { |
| 873 | $normalized['annotations'] = $annotations; |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | return $normalized; |
| 878 | } |
| 879 | |
| 880 | private function normalize_input_schema( $schema, string $tool_name ) { |
| 881 | if ( !is_array( $schema ) ) { |
| 882 | return null; |
| 883 | } |
| 884 | |
| 885 | $type = isset( $schema['type'] ) ? (string) $schema['type'] : 'object'; |
| 886 | if ( $type !== 'object' ) { |
| 887 | error_log( '[AI Engine MCP] ⚠️ Tool "' . $tool_name . '" has unsupported schema type: ' . $type ); |
| 888 | return null; |
| 889 | } |
| 890 | |
| 891 | $properties = []; |
| 892 | if ( isset( $schema['properties'] ) && ( is_array( $schema['properties'] ) || is_object( $schema['properties'] ) ) ) { |
| 893 | foreach ( (array) $schema['properties'] as $prop_name => $definition ) { |
| 894 | if ( !is_array( $definition ) ) { |
| 895 | $definition = []; |
| 896 | } |
| 897 | |
| 898 | if ( isset( $definition['type'] ) ) { |
| 899 | // Validate type definition |
| 900 | if ( is_array( $definition['type'] ) ) { |
| 901 | // Array of types (union types) - validate they're compatible with MCP clients |
| 902 | $type_array = array_map( 'strval', $definition['type'] ); |
| 903 | |
| 904 | // Check for complex types that need additional schema details |
| 905 | $complex_types = array_intersect( $type_array, [ 'object', 'array' ] ); |
| 906 | if ( !empty( $complex_types ) ) { |
| 907 | error_log( |
| 908 | '[AI Engine MCP] ⚠️ Tool "' . $tool_name . '" property "' . $prop_name . |
| 909 | '" has problematic union type with complex types: [' . implode( ', ', $type_array ) . |
| 910 | ']. This breaks ChatGPT. Auto-fixing by removing type constraint.' |
| 911 | ); |
| 912 | // Auto-fix: Remove the type constraint to accept any value |
| 913 | unset( $definition['type'] ); |
| 914 | // Keep description if present, or add one |
| 915 | if ( !isset( $definition['description'] ) ) { |
| 916 | $definition['description'] = 'Value can be of any type'; |
| 917 | } |
| 918 | } |
| 919 | else { |
| 920 | $definition['type'] = $type_array; |
| 921 | } |
| 922 | } |
| 923 | else { |
| 924 | $definition['type'] = (string) $definition['type']; |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | $properties[ $prop_name ] = $definition; |
| 929 | } |
| 930 | } |
| 931 | |
| 932 | $required = []; |
| 933 | if ( isset( $schema['required'] ) && is_array( $schema['required'] ) ) { |
| 934 | foreach ( $schema['required'] as $field ) { |
| 935 | $field_name = trim( (string) $field ); |
| 936 | if ( $field_name !== '' ) { |
| 937 | $required[] = $field_name; |
| 938 | } |
| 939 | } |
| 940 | $required = array_values( array_unique( $required ) ); |
| 941 | } |
| 942 | |
| 943 | $normalized = [ |
| 944 | 'type' => 'object', |
| 945 | 'properties' => empty( $properties ) ? new stdClass() : $properties, |
| 946 | ]; |
| 947 | |
| 948 | if ( !empty( $required ) ) { |
| 949 | $normalized['required'] = $required; |
| 950 | } |
| 951 | |
| 952 | if ( array_key_exists( 'additionalProperties', $schema ) ) { |
| 953 | $normalized['additionalProperties'] = (bool) $schema['additionalProperties']; |
| 954 | } |
| 955 | |
| 956 | return $normalized; |
| 957 | } |
| 958 | |
| 959 | private function normalize_annotations( array $annotations, string $tool_name ): array { |
| 960 | $allowed_keys = [ 'title', 'readOnlyHint', 'destructiveHint', 'idempotentHint', 'openWorldHint' ]; |
| 961 | $normalized = []; |
| 962 | |
| 963 | foreach ( $annotations as $key => $value ) { |
| 964 | if ( !in_array( $key, $allowed_keys, true ) ) { |
| 965 | continue; |
| 966 | } |
| 967 | |
| 968 | if ( in_array( $key, [ 'readOnlyHint', 'destructiveHint', 'idempotentHint', 'openWorldHint' ], true ) ) { |
| 969 | $normalized[ $key ] = (bool) $value; |
| 970 | } |
| 971 | elseif ( $key === 'title' ) { |
| 972 | $normalized['title'] = wp_strip_all_tags( (string) $value ); |
| 973 | } |
| 974 | } |
| 975 | |
| 976 | if ( empty( $normalized ) && $this->logging && !empty( $annotations ) ) { |
| 977 | error_log( '[AI Engine MCP] 🔎 Tool "' . $tool_name . '" included unsupported annotation keys.' ); |
| 978 | } |
| 979 | |
| 980 | return $normalized; |
| 981 | } |
| 982 | #endregion |
| 983 | |
| 984 | #region Tools Call (execute_tool) |
| 985 | |
| 986 | // Armed while a tool runs, so the shutdown net below can answer for it. |
| 987 | private static $currentToolCall = null; |
| 988 | private static $shutdownNetRegistered = false; |
| 989 | // Emergency memory reserve, released by the net so it can run even after an |
| 990 | // out-of-memory fatal on hosts where ini_set is disabled. |
| 991 | private static $memoryReserve = null; |
| 992 | |
| 993 | /** |
| 994 | * A tool callback that dies hard (out of memory, fatal error) would end the |
| 995 | * request as a raw 500 with an empty body, and MCP clients then treat the |
| 996 | * WHOLE server as unreachable (Anthropic aborts the conversation with |
| 997 | * "Connection error while communicating with MCP server"). This shutdown |
| 998 | * net answers with a valid JSON-RPC tool error instead, so only the tool |
| 999 | * fails and the client/model can react to it. |
| 1000 | */ |
| 1001 | private function arm_fatal_net( $tool, $id ) { |
| 1002 | self::$currentToolCall = [ 'tool' => $tool, 'id' => $id ]; |
| 1003 | if ( self::$memoryReserve === null ) { |
| 1004 | self::$memoryReserve = str_repeat( 'x', 2 * 1024 * 1024 ); |
| 1005 | } |
| 1006 | if ( self::$shutdownNetRegistered ) { |
| 1007 | return; |
| 1008 | } |
| 1009 | self::$shutdownNetRegistered = true; |
| 1010 | // WordPress's own fatal handler runs first (registered at bootstrap) and |
| 1011 | // exits after printing its "critical error" 500, which would keep our net |
| 1012 | // from ever running. WP_SANDBOX_SCRAPING is core's shutdown-time escape |
| 1013 | // hatch for "the request handles fatals itself" (the enabled filter is |
| 1014 | // only consulted at bootstrap, so it cannot be used here). |
| 1015 | if ( !defined( 'WP_SANDBOX_SCRAPING' ) ) { |
| 1016 | define( 'WP_SANDBOX_SCRAPING', true ); |
| 1017 | } |
| 1018 | register_shutdown_function( function () { |
| 1019 | $ctx = self::$currentToolCall; |
| 1020 | if ( empty( $ctx ) ) { |
| 1021 | return; |
| 1022 | } |
| 1023 | $err = error_get_last(); |
| 1024 | if ( !$err || !in_array( $err['type'], [ E_ERROR, E_PARSE, E_CORE_ERROR, E_COMPILE_ERROR ], true ) ) { |
| 1025 | return; |
| 1026 | } |
| 1027 | // An OOM can leave ZERO headroom, killing this emitter itself. Free the |
| 1028 | // reserve first (works everywhere), then lift the limit where allowed |
| 1029 | // (the request is over anyway). |
| 1030 | self::$memoryReserve = null; |
| 1031 | @ini_set( 'memory_limit', '-1' ); |
| 1032 | // Discard any partial/buffered output so the JSON is the only body. |
| 1033 | while ( ob_get_level() > 0 ) { |
| 1034 | @ob_end_clean(); |
| 1035 | } |
| 1036 | if ( !headers_sent() ) { |
| 1037 | http_response_code( 200 ); |
| 1038 | header( 'Content-Type: application/json' ); |
| 1039 | } |
| 1040 | $msg = 'The tool "' . $ctx['tool'] . '" crashed on this site (' . |
| 1041 | substr( $err['message'], 0, 300 ) . '). The other tools should still work.'; |
| 1042 | echo '{"jsonrpc":"2.0","id":' . json_encode( $ctx['id'] ) . |
| 1043 | ',"result":{"content":[{"type":"text","text":' . json_encode( $msg ) . '}],"isError":true}}'; |
| 1044 | } ); |
| 1045 | } |
| 1046 | |
| 1047 | private function execute_tool( $tool, $args, $id ) { |
| 1048 | $start = microtime( true ); |
| 1049 | $response = null; |
| 1050 | $status = 'error'; |
| 1051 | $error_msg = null; |
| 1052 | $this->arm_fatal_net( $tool, $id ); |
| 1053 | try { |
| 1054 | // Ensure tool access levels are populated (each HTTP request starts fresh) |
| 1055 | if ( empty( $this->tool_access_levels ) ) { |
| 1056 | $this->get_tools_list(); |
| 1057 | } |
| 1058 | |
| 1059 | // Defense in depth: verify tool access even if it wasn't filtered from the listing |
| 1060 | $tool_level = $this->tool_access_levels[ $tool ] ?? 'admin'; |
| 1061 | if ( !$this->role_has_access( $tool_level ) ) { |
| 1062 | $error_msg = "Access denied: tool '{$tool}' requires '{$tool_level}' access."; |
| 1063 | $response = $this->rpc_error( $id, -32600, $error_msg ); |
| 1064 | return $response; |
| 1065 | } |
| 1066 | |
| 1067 | // Handle built-in tools first |
| 1068 | if ( $tool === 'mcp_ping' ) { |
| 1069 | if ( $this->logging ) { |
| 1070 | $this->log( '🛠️ Tool: mcp_ping' ); |
| 1071 | } |
| 1072 | $ping_data = [ |
| 1073 | 'time' => gmdate( 'Y-m-d H:i:s' ), |
| 1074 | 'name' => get_bloginfo( 'name' ), |
| 1075 | ]; |
| 1076 | $response = [ |
| 1077 | 'jsonrpc' => '2.0', |
| 1078 | 'id' => $id, |
| 1079 | 'result' => [ |
| 1080 | 'content' => [ |
| 1081 | [ |
| 1082 | 'type' => 'text', |
| 1083 | 'text' => 'Ping successful: ' . wp_json_encode( $ping_data, JSON_PRETTY_PRINT ), |
| 1084 | ], |
| 1085 | ], |
| 1086 | 'data' => $ping_data, |
| 1087 | ], |
| 1088 | ]; |
| 1089 | $status = 'success'; |
| 1090 | return $response; |
| 1091 | } |
| 1092 | |
| 1093 | // Let other modules handle their tools |
| 1094 | if ( $this->logging ) { |
| 1095 | // Log tool calls with more context |
| 1096 | $args_preview = ''; |
| 1097 | if ( !empty( $args ) ) { |
| 1098 | // Show key args for common tools |
| 1099 | if ( isset( $args['ID'] ) ) { |
| 1100 | $args_preview = ' (ID: ' . $args['ID'] . ')'; |
| 1101 | } |
| 1102 | elseif ( isset( $args['query'] ) ) { |
| 1103 | $args_preview = ' (query: "' . substr( $args['query'], 0, 30 ) . '...")'; |
| 1104 | } |
| 1105 | elseif ( isset( $args['message'] ) ) { |
| 1106 | $args_preview = ' (message: "' . substr( $args['message'], 0, 30 ) . '...")'; |
| 1107 | } |
| 1108 | } |
| 1109 | // Log to both error log and UI |
| 1110 | error_log( '[AI Engine MCP] 🛠️ ' . $tool . $args_preview ); |
| 1111 | $this->log( '🛠️ Tool: ' . $tool . $args_preview ); |
| 1112 | } |
| 1113 | $filtered = apply_filters( 'mwai_mcp_callback', null, $tool, $args, $id, $this ); |
| 1114 | |
| 1115 | if ( $filtered !== null ) { |
| 1116 | // Check if it's already a full JSON-RPC response (backward compatibility) |
| 1117 | if ( is_array( $filtered ) && isset( $filtered['jsonrpc'] ) && isset( $filtered['id'] ) ) { |
| 1118 | $response = $filtered; |
| 1119 | $status = isset( $filtered['error'] ) ? 'error' : 'success'; |
| 1120 | if ( $status === 'error' ) { |
| 1121 | $error_msg = $filtered['error']['message'] ?? null; |
| 1122 | } |
| 1123 | return $response; |
| 1124 | } |
| 1125 | |
| 1126 | // Otherwise, wrap the result in proper JSON-RPC format |
| 1127 | $response = [ |
| 1128 | 'jsonrpc' => '2.0', |
| 1129 | 'id' => $id, |
| 1130 | 'result' => $this->format_tool_result( $filtered ), |
| 1131 | ]; |
| 1132 | $status = 'success'; |
| 1133 | return $response; |
| 1134 | } |
| 1135 | |
| 1136 | throw new Exception( "Unknown tool: {$tool}" ); |
| 1137 | } |
| 1138 | catch ( Throwable $e ) { |
| 1139 | // A failing tool is reported as a tool-level error (isError result), |
| 1140 | // NOT a JSON-RPC protocol error: clients treat protocol errors as a |
| 1141 | // broken server, while an isError result lets the model read the |
| 1142 | // message and adapt. Throwable also catches TypeError & friends. |
| 1143 | $error_msg = $e->getMessage(); |
| 1144 | $response = [ |
| 1145 | 'jsonrpc' => '2.0', |
| 1146 | 'id' => $id, |
| 1147 | 'result' => [ |
| 1148 | 'content' => [ |
| 1149 | [ |
| 1150 | 'type' => 'text', |
| 1151 | 'text' => 'The tool "' . $tool . '" failed: ' . $error_msg, |
| 1152 | ], |
| 1153 | ], |
| 1154 | 'isError' => true, |
| 1155 | ], |
| 1156 | ]; |
| 1157 | return $response; |
| 1158 | } |
| 1159 | finally { |
| 1160 | self::$currentToolCall = null; |
| 1161 | $duration_ms = (int) round( ( microtime( true ) - $start ) * 1000 ); |
| 1162 | // Fire the action even on access denials and errors so admins can see |
| 1163 | // attempted-but-blocked tool calls in MCP Logs. |
| 1164 | do_action( 'mwai_mcp_tool_called', [ |
| 1165 | 'tool' => $tool, |
| 1166 | 'args' => $args, |
| 1167 | 'result' => $response, |
| 1168 | 'status' => $status, |
| 1169 | 'error_msg' => $error_msg, |
| 1170 | 'duration_ms' => $duration_ms, |
| 1171 | 'client_id' => $this->auth_client_id, |
| 1172 | 'client_name' => $this->auth_client_name, |
| 1173 | 'auth_method' => $this->auth_method, |
| 1174 | 'request_id' => $id, |
| 1175 | 'user_id' => get_current_user_id(), |
| 1176 | ] ); |
| 1177 | } |
| 1178 | } |
| 1179 | #endregion |
| 1180 | |
| 1181 | #region Handle /upload (one-time file upload via token) |
| 1182 | public function handle_upload( WP_REST_Request $request ) { |
| 1183 | $token = $request->get_param( 'token' ); |
| 1184 | if ( empty( $token ) ) { |
| 1185 | return new WP_REST_Response( [ 'success' => false, 'message' => 'Missing token.' ], 400 ); |
| 1186 | } |
| 1187 | |
| 1188 | $transient_key = 'mwai_mcp_upload_' . $token; |
| 1189 | $data = get_transient( $transient_key ); |
| 1190 | if ( empty( $data ) ) { |
| 1191 | return new WP_REST_Response( [ 'success' => false, 'message' => 'Invalid or expired upload token.' ], 403 ); |
| 1192 | } |
| 1193 | |
| 1194 | // Immediately delete the transient so the token can only be used once |
| 1195 | delete_transient( $transient_key ); |
| 1196 | |
| 1197 | $files = $request->get_file_params(); |
| 1198 | if ( empty( $files['file'] ) ) { |
| 1199 | return new WP_REST_Response( [ 'success' => false, 'message' => 'No file provided. Use: curl -X POST -F "file=@/path/to/file" "<url>"' ], 400 ); |
| 1200 | } |
| 1201 | |
| 1202 | $uploaded = $files['file']; |
| 1203 | if ( $uploaded['error'] !== UPLOAD_ERR_OK ) { |
| 1204 | return new WP_REST_Response( [ 'success' => false, 'message' => 'Upload error code: ' . $uploaded['error'] ], 400 ); |
| 1205 | } |
| 1206 | |
| 1207 | // Set admin context for media handling |
| 1208 | if ( !current_user_can( 'administrator' ) ) { |
| 1209 | wp_set_current_user( 1 ); |
| 1210 | } |
| 1211 | |
| 1212 | require_once ABSPATH . 'wp-admin/includes/file.php'; |
| 1213 | require_once ABSPATH . 'wp-admin/includes/media.php'; |
| 1214 | require_once ABSPATH . 'wp-admin/includes/image.php'; |
| 1215 | |
| 1216 | // Use the filename from the transient (sanitized at creation time) |
| 1217 | $file = [ |
| 1218 | 'name' => $data['filename'], |
| 1219 | 'tmp_name' => $uploaded['tmp_name'], |
| 1220 | ]; |
| 1221 | |
| 1222 | $attachment_id = media_handle_sideload( $file, 0, $data['description'] ); |
| 1223 | if ( is_wp_error( $attachment_id ) ) { |
| 1224 | return new WP_REST_Response( [ 'success' => false, 'message' => $attachment_id->get_error_message() ], 500 ); |
| 1225 | } |
| 1226 | |
| 1227 | if ( !empty( $data['title'] ) ) { |
| 1228 | wp_update_post( [ 'ID' => $attachment_id, 'post_title' => sanitize_text_field( $data['title'] ) ] ); |
| 1229 | } |
| 1230 | if ( !empty( $data['alt'] ) ) { |
| 1231 | update_post_meta( $attachment_id, '_wp_attachment_image_alt', sanitize_text_field( $data['alt'] ) ); |
| 1232 | } |
| 1233 | |
| 1234 | return new WP_REST_Response( [ |
| 1235 | 'success' => true, |
| 1236 | 'attachment_id' => $attachment_id, |
| 1237 | 'url' => wp_get_attachment_url( $attachment_id ), |
| 1238 | ], 200 ); |
| 1239 | } |
| 1240 | #endregion |
| 1241 | |
| 1242 | #region Message Queue (per-message transient) |
| 1243 | private function transient_key( $sess, $id ) { |
| 1244 | return "{$this->queue_key}_{$sess}_{$id}"; |
| 1245 | } |
| 1246 | |
| 1247 | private function store_message( $sess, $payload ) { |
| 1248 | if ( !$sess ) { |
| 1249 | return; |
| 1250 | } |
| 1251 | $idKey = array_key_exists( 'id', $payload ) ? ( $payload['id'] ?? 'NULL' ) : 'N/A'; |
| 1252 | set_transient( $this->transient_key( $sess, $idKey ), $payload, 30 ); |
| 1253 | $this->log( "queued #{$idKey}" ); |
| 1254 | } |
| 1255 | |
| 1256 | private function fetch_messages( $sess ) { |
| 1257 | global $wpdb; |
| 1258 | $like = $wpdb->esc_like( '_transient_' . "{$this->queue_key}_{$sess}_" ) . '%'; |
| 1259 | |
| 1260 | $rows = $wpdb->get_results( |
| 1261 | $wpdb->prepare( |
| 1262 | "SELECT option_name, option_value FROM {$wpdb->options} WHERE option_name LIKE %s", |
| 1263 | $like |
| 1264 | ), |
| 1265 | ARRAY_A |
| 1266 | ); |
| 1267 | |
| 1268 | $msgs = []; |
| 1269 | foreach ( $rows as $r ) { |
| 1270 | $msgs[] = maybe_unserialize( $r['option_value'] ); |
| 1271 | delete_option( $r['option_name'] ); |
| 1272 | } |
| 1273 | usort( $msgs, fn ( $a, $b ) => ( $a['id'] ?? 0 ) <=> ( $b['id'] ?? 0 ) ); |
| 1274 | if ( $msgs ) { |
| 1275 | $this->log( 'flush ' . count( $msgs ) . ' msg(s)' ); |
| 1276 | } |
| 1277 | return $msgs; |
| 1278 | } |
| 1279 | #endregion |
| 1280 | |
| 1281 | #region Resources (note) |
| 1282 | /*--------------------------------------------------*/ |
| 1283 | /** |
| 1284 | * MCP also supports “resources” – static or dynamic data a client can |
| 1285 | * retrieve by URL (e.g. `mcp://resource/posts/123`). |
| 1286 | */ |
| 1287 | #endregion |
| 1288 | } |
| 1289 |