mcp-core.php
2 weeks ago
mcp-oauth.php
2 days ago
mcp-rest.php
2 months ago
mcp.conf
1 year ago
mcp.php
2 days ago
model-audit.php
1 week ago
workspace-mock.html
1 month ago
wpai-connectors.php
3 months ago
wpai-gateway-availability.php
4 months ago
wpai-gateway-directory.php
4 months ago
wpai-gateway-image-model.php
4 months ago
wpai-gateway-model.php
4 months ago
wpai-gateway-providers.php
4 months ago
wpai-gateway.php
4 months ago
mcp.php
1340 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 | * - Single Streamable HTTP endpoint (/mcp/v1/http), used by Claude, Claude Code and ChatGPT |
| 10 | * - Authentication via OAuth (see mcp-oauth.php) or a static bearer token |
| 11 | * - Optional URL-token endpoint (/mcp/v1/{token}) for clients that cannot send headers |
| 12 | * - Properly handles agent cancellation signals (notifications/cancelled) to free workers immediately |
| 13 | * - Caps how long an idle stream holds a PHP worker (see Connection Management below) |
| 14 | * - Sends heartbeat signals to detect dead connections quickly |
| 15 | * |
| 16 | * The legacy SSE transport (/mcp/v1/sse plus /messages, driven by a bundled mcp.js Node |
| 17 | * relay) was removed in 3.6, once the MCP spec retired it. Streamable HTTP still answers |
| 18 | * with text/event-stream framing, which is why the SSE handling below is still needed. |
| 19 | * |
| 20 | * Connection Management: |
| 21 | * - Agents send notifications/cancelled when done, triggering immediate stream closure |
| 22 | * - An idle timeout frees the worker even when agents forget to disconnect. It is |
| 23 | * 180 seconds normally, and 30 seconds when MCP debug logging is on. Size PHP |
| 24 | * workers off 180s, not 30s: an agent that opens streams and never sends DELETE |
| 25 | * holds one worker per stream for the full three minutes. Override with the |
| 26 | * mwai_mcp_stream_max_time filter (see below) if that is too long for the host. |
| 27 | * - Heartbeat comments (every 10s) help proxies and connection_aborted() detect dead sockets |
| 28 | */ |
| 29 | |
| 30 | class Meow_MWAI_Labs_MCP { |
| 31 | private $core = null; |
| 32 | private $namespace = 'mcp/v1'; |
| 33 | private $server_version = '0.0.1'; |
| 34 | private $protocol_version = '2025-06-18'; |
| 35 | private $supported_protocol_versions = [ '2024-11-05', '2025-06-18' ]; |
| 36 | private $queue_key = 'mwai_mcp_msg'; |
| 37 | private $session_id = null; |
| 38 | private $logging = false; |
| 39 | private $last_action_time = 0; |
| 40 | private $bearer_token = null; |
| 41 | private $mcp_role = 'admin'; |
| 42 | private $tool_access_levels = []; |
| 43 | // Placeholder for OAuth integration. Currently unused and kept for |
| 44 | // future implementation once the security model is revised. |
| 45 | private $oauth = null; |
| 46 | // Resolved during auth so the MCP Logs feature can attribute tool calls |
| 47 | // to a specific connector (Claude, ChatGPT, Claude Code, …) or 'bearer'. |
| 48 | // Lives on the instance for the duration of one HTTP request. |
| 49 | private $auth_client_id = null; |
| 50 | private $auth_client_name = null; |
| 51 | private $auth_method = null; // 'oauth' | 'bearer' | null |
| 52 | |
| 53 | #region Initialize |
| 54 | public function __construct( $core ) { |
| 55 | $this->core = $core; |
| 56 | |
| 57 | // Set logging based on option |
| 58 | $this->logging = $this->core->get_option( 'mcp_debug_mode', false ); |
| 59 | |
| 60 | // OAuth 2.1 with Dynamic Client Registration. Lives alongside the bearer |
| 61 | // token: bearer is for dev tools (Claude Code, scripts), OAuth is for |
| 62 | // browser-driven clients like Claude Desktop. The new module enforces |
| 63 | // strict redirect_uri matching, PKCE S256, and refresh-token rotation. |
| 64 | require_once __DIR__ . '/mcp-oauth.php'; |
| 65 | $this->oauth = new Meow_MWAI_Labs_MCP_OAuth( $core, $this ); |
| 66 | |
| 67 | add_action( 'rest_api_init', [ $this, 'rest_api_init' ] ); |
| 68 | } |
| 69 | |
| 70 | public function is_logging_enabled() { |
| 71 | return $this->logging; |
| 72 | } |
| 73 | |
| 74 | public function rest_api_init() { |
| 75 | // Load bearer token if not already loaded |
| 76 | if ( $this->bearer_token === null ) { |
| 77 | $this->bearer_token = $this->core->get_option( 'mcp_bearer_token' ); |
| 78 | } |
| 79 | $this->mcp_role = $this->core->get_option( 'mcp_role', 'admin' ); |
| 80 | |
| 81 | // Auth filter runs for both bearer token and OAuth token paths; register |
| 82 | // unconditionally so that OAuth-only deployments (no static bearer set) work. |
| 83 | static $filter_added = false; |
| 84 | if ( !$filter_added ) { |
| 85 | add_filter( 'mwai_allow_mcp', [ $this, 'auth_via_bearer_token' ], 10, 2 ); |
| 86 | $filter_added = true; |
| 87 | } |
| 88 | |
| 89 | // Extend the CORS allow-headers list for our MCP routes. The Streamable HTTP |
| 90 | // transport sends Mcp-Protocol-Version and Mcp-Session-Id on every request; |
| 91 | // WP core's default allow-list does not include them, so the browser-side |
| 92 | // preflight from claude.ai (and similar web connectors) was rejecting the |
| 93 | // actual POST and the client reported "Couldn't reach the MCP server". |
| 94 | add_filter( 'rest_allowed_cors_headers', function ( $headers ) { |
| 95 | $uri = isset( $_SERVER['REQUEST_URI'] ) ? (string) $_SERVER['REQUEST_URI'] : ''; |
| 96 | if ( strpos( $uri, '/' . $this->namespace . '/' ) === false ) { |
| 97 | return $headers; |
| 98 | } |
| 99 | foreach ( [ 'Mcp-Protocol-Version', 'Mcp-Session-Id', 'Accept' ] as $h ) { |
| 100 | if ( !in_array( $h, $headers, true ) ) { |
| 101 | $headers[] = $h; |
| 102 | } |
| 103 | } |
| 104 | return $headers; |
| 105 | } ); |
| 106 | |
| 107 | // Streamable HTTP endpoint (modern MCP transport). Always registered when |
| 108 | // the MCP module is enabled — auth is enforced by can_access_mcp(), which |
| 109 | // accepts either a bearer token or an OAuth access token. |
| 110 | register_rest_route( $this->namespace, '/http', [ |
| 111 | 'methods' => [ 'GET', 'POST', 'DELETE' ], |
| 112 | 'callback' => [ $this, 'handle_streamable_http' ], |
| 113 | 'permission_callback' => function ( $request ) { |
| 114 | return $this->can_access_mcp( $request ); |
| 115 | }, |
| 116 | 'show_in_index' => false, |
| 117 | ] ); |
| 118 | |
| 119 | // Alternative endpoint with bearer token embedded in URL path, for clients |
| 120 | // that cannot send Authorization headers. Only registered when a bearer |
| 121 | // token is configured. The token is high-entropy (wp_generate_password), |
| 122 | // compared with hash_equals, and the route is hidden (show_in_index=false). |
| 123 | // Kept because Claude Code and other MCP connectors currently work more |
| 124 | // reliably this way when proxies strip the Authorization header. |
| 125 | // TODO: Re-evaluate after 2026-12-27. Check whether connectors still need |
| 126 | // the URL-token fallback, or if header/OAuth auth has become reliable enough |
| 127 | // to deprecate it (flagged by WP.org automated security review, Jun 2026). |
| 128 | if ( !empty( $this->bearer_token ) ) { |
| 129 | register_rest_route( $this->namespace, '/' . $this->bearer_token, [ |
| 130 | 'methods' => [ 'GET', 'POST', 'DELETE' ], |
| 131 | 'callback' => [ $this, 'handle_streamable_http' ], |
| 132 | 'permission_callback' => function ( $request ) { |
| 133 | return $this->handle_noauth_access_streamable( $request ); |
| 134 | }, |
| 135 | 'show_in_index' => false, |
| 136 | ] ); |
| 137 | } |
| 138 | |
| 139 | // File upload endpoint for wp_upload_request |
| 140 | // Uses a one-time token in the URL for authentication (no bearer header needed from curl) |
| 141 | register_rest_route( $this->namespace, '/upload/(?P<token>[a-zA-Z0-9]+)', [ |
| 142 | 'methods' => 'POST', |
| 143 | 'callback' => [ $this, 'handle_upload' ], |
| 144 | 'permission_callback' => '__return_true', |
| 145 | 'show_in_index' => false, |
| 146 | ] ); |
| 147 | } |
| 148 | #endregion |
| 149 | |
| 150 | #region Auth (Bearer token) |
| 151 | /** |
| 152 | * SECURITY: MCP provides powerful WordPress management capabilities, so access must be strictly controlled. |
| 153 | * |
| 154 | * By default, only administrators can access MCP endpoints. This prevents lower-privileged users |
| 155 | * (subscribers, contributors, etc.) from executing dangerous operations like creating admin users, |
| 156 | * deleting content, or modifying settings. |
| 157 | * |
| 158 | * When a bearer token is configured, it overrides the default admin check, but access is DENIED |
| 159 | * unless a valid token is provided. This ensures MCP is secure even with default settings. |
| 160 | */ |
| 161 | public function can_access_mcp( $request ) { |
| 162 | // Default to requiring administrator capability for security. Checked via |
| 163 | // manage_options rather than the 'administrator' role name, so that |
| 164 | // admin-equivalent accounts (custom roles, individually granted caps) are |
| 165 | // not locked out. Same reasoning as user_can_authorize() in mcp-oauth.php. |
| 166 | $is_admin = current_user_can( 'manage_options' ); |
| 167 | return apply_filters( 'mwai_allow_mcp', $is_admin, $request ); |
| 168 | } |
| 169 | |
| 170 | public function auth_via_bearer_token( $allow, $request ) { |
| 171 | // Skip if already authenticated as admin |
| 172 | if ( $allow ) { |
| 173 | return $allow; |
| 174 | } |
| 175 | |
| 176 | $hdr = $request->get_header( 'authorization' ); |
| 177 | |
| 178 | // If no authorization header but bearer token is configured, deny access |
| 179 | if ( !$hdr && !empty( $this->bearer_token ) ) { |
| 180 | if ( $this->logging ) { |
| 181 | error_log( '[AI Engine MCP] ❌ No authorization header provided. Server may be stripping headers.' ); |
| 182 | } |
| 183 | return false; |
| 184 | } |
| 185 | |
| 186 | // Check for Bearer token in header |
| 187 | if ( $hdr && preg_match( '/Bearer\s+(.+)/i', $hdr, $m ) ) { |
| 188 | $token = trim( $m[1] ); |
| 189 | $auth_result = 'none'; |
| 190 | |
| 191 | // Check if it's an OAuth token |
| 192 | if ( $this->oauth ) { |
| 193 | $token_data = $this->oauth->validate_token( $token ); |
| 194 | if ( $token_data ) { |
| 195 | // Defense in depth: even if a token was issued (or stored from before |
| 196 | // the authorize-time admin gate landed), only accept it if the linked |
| 197 | // user still holds administrator capability. Otherwise a Subscriber's |
| 198 | // OAuth token would inherit the global mcp_role and reach admin tools. |
| 199 | if ( !$this->oauth->user_can_authorize( $token_data['user_id'] ) ) { |
| 200 | if ( $this->logging ) { |
| 201 | error_log( '[AI Engine MCP] ❌ OAuth token rejected: user ' . $token_data['user_id'] . ' is not an administrator.' ); |
| 202 | } |
| 203 | return false; |
| 204 | } |
| 205 | // Set current user based on OAuth token |
| 206 | wp_set_current_user( $token_data['user_id'] ); |
| 207 | $auth_result = 'oauth'; |
| 208 | $this->auth_method = 'oauth'; |
| 209 | $this->auth_client_id = $token_data['client_id'] ?? null; |
| 210 | $this->auth_client_name = $token_data['client_name'] ?? null; |
| 211 | return true; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | // Fall back to static bearer token if configured |
| 216 | if ( !empty( $this->bearer_token ) && hash_equals( $this->bearer_token, $token ) ) { |
| 217 | if ( $admin = $this->core->get_admin_user() ) { |
| 218 | wp_set_current_user( $admin->ID, $admin->user_login ); |
| 219 | } |
| 220 | $auth_result = 'static'; |
| 221 | $this->auth_method = 'bearer'; |
| 222 | $this->auth_client_id = 'bearer'; |
| 223 | $this->auth_client_name = null; |
| 224 | if ( $this->logging ) { |
| 225 | error_log( '[AI Engine MCP] 🔐 Bearer token auth OK' ); |
| 226 | } |
| 227 | return true; |
| 228 | } |
| 229 | |
| 230 | if ( $this->logging && $auth_result === 'none' ) { |
| 231 | error_log( '[AI Engine MCP] ❌ Bearer token invalid.' ); |
| 232 | } |
| 233 | // Explicitly deny access for invalid tokens |
| 234 | return false; |
| 235 | } |
| 236 | |
| 237 | // ?token=xyz fallback (optional) - only for static bearer token |
| 238 | if ( !empty( $this->bearer_token ) ) { |
| 239 | $q = sanitize_text_field( $request->get_param( 'token' ) ); |
| 240 | if ( $q && hash_equals( $this->bearer_token, $q ) ) { |
| 241 | if ( $admin = $this->core->get_admin_user() ) { |
| 242 | wp_set_current_user( $admin->ID, $admin->user_login ); |
| 243 | } |
| 244 | $this->auth_method = 'bearer'; |
| 245 | $this->auth_client_id = 'bearer'; |
| 246 | return true; |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | // If bearer token is configured but no valid auth provided, deny access |
| 251 | if ( !empty( $this->bearer_token ) ) { |
| 252 | return false; |
| 253 | } |
| 254 | |
| 255 | return $allow; |
| 256 | } |
| 257 | |
| 258 | public function handle_noauth_access_streamable( $request ) { |
| 259 | // For Streamable HTTP with token in URL path (no trailing slash) |
| 260 | $route = $request->get_route(); |
| 261 | $expected = '/' . $this->namespace . '/' . $this->bearer_token; |
| 262 | if ( $route !== $expected ) { |
| 263 | if ( $this->logging ) { |
| 264 | error_log( '[AI Engine MCP] ❌ Invalid Streamable HTTP no-auth URL access attempt.' ); |
| 265 | } |
| 266 | return false; |
| 267 | } |
| 268 | |
| 269 | // Set the current user to admin since token is valid |
| 270 | if ( $admin = $this->core->get_admin_user() ) { |
| 271 | wp_set_current_user( $admin->ID, $admin->user_login ); |
| 272 | } |
| 273 | $this->auth_method = 'bearer'; |
| 274 | $this->auth_client_id = 'bearer'; |
| 275 | return true; |
| 276 | } |
| 277 | |
| 278 | #endregion |
| 279 | |
| 280 | #region Helpers (log / JSON-RPC utils) |
| 281 | /** |
| 282 | * Release the PHP session lock as early as possible. Long MCP calls (e.g. content |
| 283 | * mutations on large posts) can otherwise serialize behind any other request from the |
| 284 | * same client that opened a session, since PHP holds an exclusive write lock on the |
| 285 | * session file for the lifetime of the request. The result is the ~max_execution_time |
| 286 | * hangs operators see on busy sites. Closing the session is idempotent and safe — if |
| 287 | * no session is active the call is a no-op. |
| 288 | */ |
| 289 | private function release_session_lock(): void { |
| 290 | if ( function_exists( 'session_status' ) && session_status() === PHP_SESSION_ACTIVE ) { |
| 291 | session_write_close(); |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | private function log( $msg ) { |
| 296 | // This method is for internal UI logs - keep it minimal |
| 297 | if ( $this->logging ) { |
| 298 | // Only log important messages to UI |
| 299 | if ( strpos( $msg, 'queued' ) === false && strpos( $msg, 'flush' ) === false ) { |
| 300 | Meow_MWAI_Logging::log( "[AI Engine MCP] {$msg}" ); |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /** Wrap a JSON-RPC error object */ |
| 306 | private function rpc_error( $id, int $code, string $msg, $extra = null ): array { |
| 307 | $err = [ 'code' => $code, 'message' => $msg ]; |
| 308 | if ( $extra !== null ) { |
| 309 | $err['data'] = $extra; |
| 310 | } |
| 311 | return [ 'jsonrpc' => '2.0', 'id' => $id, 'error' => $err ]; |
| 312 | } |
| 313 | |
| 314 | /** Format tool result for MCP protocol */ |
| 315 | private function format_tool_result( $result ): array { |
| 316 | // If result is a string, wrap it in the MCP content format |
| 317 | if ( is_string( $result ) ) { |
| 318 | return [ |
| 319 | 'content' => [ |
| 320 | [ |
| 321 | 'type' => 'text', |
| 322 | 'text' => $result, |
| 323 | ], |
| 324 | ], |
| 325 | ]; |
| 326 | } |
| 327 | |
| 328 | // If result has 'content' key, assume it's already properly formatted |
| 329 | if ( is_array( $result ) && isset( $result['content'] ) ) { |
| 330 | return $result; |
| 331 | } |
| 332 | |
| 333 | // If result is an array without 'content' key, wrap it as JSON |
| 334 | if ( is_array( $result ) ) { |
| 335 | return [ |
| 336 | 'content' => [ |
| 337 | [ |
| 338 | 'type' => 'text', |
| 339 | 'text' => wp_json_encode( $result, JSON_PRETTY_PRINT ), |
| 340 | ], |
| 341 | ], |
| 342 | 'data' => $result, |
| 343 | ]; |
| 344 | } |
| 345 | |
| 346 | // For any other type, convert to string and wrap |
| 347 | return [ |
| 348 | 'content' => [ |
| 349 | [ |
| 350 | 'type' => 'text', |
| 351 | 'text' => (string) $result, |
| 352 | ], |
| 353 | ], |
| 354 | ]; |
| 355 | } |
| 356 | #endregion |
| 357 | |
| 358 | #region Handle direct JSON-RPC |
| 359 | /** |
| 360 | * Shared JSON-RPC processor: takes a decoded request body, dispatches the method, |
| 361 | * and returns an immediate WP_REST_Response. Used by the Streamable HTTP POST handler |
| 362 | * (the modern transport for Claude Desktop, Claude.ai, ChatGPT, Claude Code). |
| 363 | */ |
| 364 | private function handle_direct_jsonrpc( WP_REST_Request $request, $data ) { |
| 365 | $this->release_session_lock(); |
| 366 | $id = $data['id'] ?? null; |
| 367 | $method = $data['method'] ?? null; |
| 368 | |
| 369 | if ( json_last_error() !== JSON_ERROR_NONE ) { |
| 370 | $response = new WP_REST_Response( [ |
| 371 | 'jsonrpc' => '2.0', |
| 372 | 'id' => null, |
| 373 | 'error' => [ 'code' => -32700, 'message' => 'Parse error: invalid JSON' ] |
| 374 | ], 200 ); |
| 375 | $response->set_headers( [ 'Content-Type' => 'application/json' ] ); |
| 376 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 377 | if ( !empty( $session_header ) ) { |
| 378 | return $this->attach_session_header( $response, sanitize_text_field( $session_header ) ); |
| 379 | } |
| 380 | return $response; |
| 381 | } |
| 382 | |
| 383 | if ( !is_array( $data ) || !$method ) { |
| 384 | $response = new WP_REST_Response( [ |
| 385 | 'jsonrpc' => '2.0', |
| 386 | 'id' => $id, |
| 387 | 'error' => [ 'code' => -32600, 'message' => 'Invalid Request' ] |
| 388 | ], 200 ); |
| 389 | $response->set_headers( [ 'Content-Type' => 'application/json' ] ); |
| 390 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 391 | if ( !empty( $session_header ) ) { |
| 392 | return $this->attach_session_header( $response, sanitize_text_field( $session_header ) ); |
| 393 | } |
| 394 | return $response; |
| 395 | } |
| 396 | |
| 397 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 398 | $session_id = ''; |
| 399 | if ( !empty( $session_header ) ) { |
| 400 | $session_id = sanitize_text_field( $session_header ); |
| 401 | } |
| 402 | |
| 403 | if ( $method === 'initialize' || empty( $session_id ) ) { |
| 404 | $session_id = wp_generate_uuid4(); |
| 405 | if ( $this->logging ) { |
| 406 | error_log( '[AI Engine MCP] 🆔 Direct session initialized: ' . $session_id ); |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | try { |
| 411 | $reply = null; |
| 412 | |
| 413 | switch ( $method ) { |
| 414 | case 'initialize': |
| 415 | // Check if client requests a specific protocol version |
| 416 | $params = $data['params'] ?? []; |
| 417 | $requested_version = $params['protocolVersion'] ?? null; |
| 418 | $client_info = $params['clientInfo'] ?? null; |
| 419 | |
| 420 | if ( $this->logging && $client_info ) { |
| 421 | $client_name = $client_info['name'] ?? 'unknown'; |
| 422 | $client_version = $client_info['version'] ?? 'unknown'; |
| 423 | error_log( "[AI Engine MCP] Client: {$client_name} v{$client_version}" ); |
| 424 | } |
| 425 | |
| 426 | // Negotiate protocol version: use client's version if supported |
| 427 | $negotiated_version = $this->protocol_version; |
| 428 | if ( $requested_version && in_array( $requested_version, $this->supported_protocol_versions, true ) ) { |
| 429 | $negotiated_version = $requested_version; |
| 430 | } |
| 431 | else if ( $requested_version && $requested_version !== $this->protocol_version ) { |
| 432 | if ( $this->logging ) { |
| 433 | Meow_MWAI_Logging::warn( "[AI Engine MCP] Client requested unsupported protocol version {$requested_version}" ); |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | $reply = [ |
| 438 | 'jsonrpc' => '2.0', |
| 439 | 'id' => $id, |
| 440 | 'result' => [ |
| 441 | 'protocolVersion' => $negotiated_version, |
| 442 | 'serverInfo' => (object) [ |
| 443 | 'name' => 'AI Engine - ' . get_bloginfo( 'name' ), |
| 444 | 'version' => $this->server_version, |
| 445 | ], |
| 446 | 'capabilities' => (object) [ |
| 447 | 'tools' => new stdClass(), |
| 448 | ], |
| 449 | ], |
| 450 | ]; |
| 451 | break; |
| 452 | |
| 453 | case 'tools/list': |
| 454 | $tools = $this->get_tools_list(); |
| 455 | |
| 456 | // Debug logging for tools/list |
| 457 | if ( $this->logging ) { |
| 458 | $user_agent = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : 'unknown'; |
| 459 | error_log( '[AI Engine MCP Direct] 📋 tools/list requested by: ' . $user_agent ); |
| 460 | error_log( '[AI Engine MCP Direct] 📊 Returning ' . count( $tools ) . ' tools' ); |
| 461 | if ( count( $tools ) > 0 ) { |
| 462 | $tool_names = array_column( $tools, 'name' ); |
| 463 | error_log( '[AI Engine MCP Direct] 🛠️ Tool names: ' . implode( ', ', $tool_names ) ); |
| 464 | } |
| 465 | else { |
| 466 | error_log( '[AI Engine MCP Direct] ⚠️ WARNING: No tools returned!' ); |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | $reply = [ |
| 471 | 'jsonrpc' => '2.0', |
| 472 | 'id' => $id, |
| 473 | 'result' => [ 'tools' => $tools ], |
| 474 | ]; |
| 475 | break; |
| 476 | |
| 477 | case 'tools/call': |
| 478 | $params = $data['params'] ?? []; |
| 479 | $tool = $params['name'] ?? ''; |
| 480 | $arguments = $params['arguments'] ?? []; |
| 481 | |
| 482 | if ( $this->logging ) { |
| 483 | error_log( '[AI Engine MCP Direct] 🔧 tools/call - Tool: ' . $tool ); |
| 484 | error_log( '[AI Engine MCP Direct] 🔧 tools/call - Arguments: ' . wp_json_encode( $arguments ) ); |
| 485 | } |
| 486 | |
| 487 | try { |
| 488 | $reply = $this->execute_tool( $tool, $arguments, $id ); |
| 489 | if ( $this->logging ) { |
| 490 | error_log( '[AI Engine MCP Direct] � |
| 491 | tools/call - Success for tool: ' . $tool ); |
| 492 | } |
| 493 | } |
| 494 | catch ( Exception $e ) { |
| 495 | if ( $this->logging ) { |
| 496 | error_log( '[AI Engine MCP Direct] ❌ tools/call - Error: ' . $e->getMessage() ); |
| 497 | } |
| 498 | throw $e; |
| 499 | } |
| 500 | break; |
| 501 | |
| 502 | case 'notifications/initialized': |
| 503 | // This is a notification from the client indicating it has initialized |
| 504 | // No response needed for notifications |
| 505 | // Client initialized - no need to log |
| 506 | return $this->attach_session_header( new WP_REST_Response( null, 204 ), $session_id ); |
| 507 | break; |
| 508 | |
| 509 | default: |
| 510 | // Check if it's a notification (no id) |
| 511 | if ( $id === null && strpos( $method, 'notifications/' ) === 0 ) { |
| 512 | if ( $this->logging ) { |
| 513 | error_log( '[AI Engine MCP] 📨 Notification received: ' . $method ); |
| 514 | } |
| 515 | return $this->attach_session_header( new WP_REST_Response( null, 204 ), $session_id ); |
| 516 | } |
| 517 | |
| 518 | $reply = [ |
| 519 | 'jsonrpc' => '2.0', |
| 520 | 'id' => $id, |
| 521 | 'error' => [ 'code' => -32601, 'message' => "Method not found: {$method}" ] |
| 522 | ]; |
| 523 | } |
| 524 | |
| 525 | // Ensure proper JSON-RPC response |
| 526 | $response = new WP_REST_Response( $reply, 200 ); |
| 527 | $response->set_headers( [ 'Content-Type' => 'application/json' ] ); |
| 528 | return $this->attach_session_header( $response, $session_id ); |
| 529 | |
| 530 | } |
| 531 | catch ( Throwable $e ) { |
| 532 | if ( $this->logging ) { |
| 533 | error_log( '[AI Engine MCP] ❌ Exception in handle_direct_jsonrpc: ' . $e->getMessage() ); |
| 534 | } |
| 535 | |
| 536 | $error_response = new WP_REST_Response( [ |
| 537 | 'jsonrpc' => '2.0', |
| 538 | 'id' => $id, |
| 539 | 'error' => [ 'code' => -32603, 'message' => 'Internal error', 'data' => $e->getMessage() ] |
| 540 | ], 200 ); |
| 541 | $error_response->set_headers( [ 'Content-Type' => 'application/json' ] ); |
| 542 | return $this->attach_session_header( $error_response, $session_id ); |
| 543 | } |
| 544 | } |
| 545 | #endregion |
| 546 | |
| 547 | #region Session helpers |
| 548 | private function attach_session_header( WP_REST_Response $response, string $session_id ) { |
| 549 | if ( empty( $session_id ) ) { |
| 550 | return $response; |
| 551 | } |
| 552 | |
| 553 | $response->header( 'Mcp-Session-Id', $session_id ); |
| 554 | |
| 555 | if ( $this->logging ) { |
| 556 | error_log( '[AI Engine MCP] 🪪 Response session header: ' . $session_id ); |
| 557 | } |
| 558 | |
| 559 | return $response; |
| 560 | } |
| 561 | #endregion |
| 562 | |
| 563 | #region Handle Streamable HTTP (Modern MCP transport) |
| 564 | /** |
| 565 | * Handle Streamable HTTP requests per MCP specification. |
| 566 | * This is the modern transport used by Claude Code and other MCP clients. |
| 567 | * |
| 568 | * - POST: Send JSON-RPC request, receive JSON response (or SSE for streaming) |
| 569 | * - GET: Open SSE stream for server-initiated messages |
| 570 | * - DELETE: Terminate the session |
| 571 | * |
| 572 | * @see https://modelcontextprotocol.io/specification/2025-03-26/basic/transports#streamable-http |
| 573 | */ |
| 574 | public function handle_streamable_http( WP_REST_Request $request ) { |
| 575 | $method = $request->get_method(); |
| 576 | |
| 577 | switch ( $method ) { |
| 578 | case 'POST': |
| 579 | return $this->handle_streamable_http_post( $request ); |
| 580 | |
| 581 | case 'GET': |
| 582 | return $this->handle_streamable_http_get( $request ); |
| 583 | |
| 584 | case 'DELETE': |
| 585 | return $this->handle_streamable_http_delete( $request ); |
| 586 | |
| 587 | default: |
| 588 | return new WP_REST_Response( [ |
| 589 | 'error' => 'Method not allowed' |
| 590 | ], 405 ); |
| 591 | } |
| 592 | } |
| 593 | |
| 594 | /** |
| 595 | * Handle POST requests for Streamable HTTP. |
| 596 | * This processes JSON-RPC requests and returns JSON responses. |
| 597 | */ |
| 598 | private function handle_streamable_http_post( WP_REST_Request $request ) { |
| 599 | $this->release_session_lock(); |
| 600 | $raw_body = $request->get_body(); |
| 601 | |
| 602 | if ( empty( $raw_body ) ) { |
| 603 | return new WP_REST_Response( [ |
| 604 | 'jsonrpc' => '2.0', |
| 605 | 'id' => null, |
| 606 | 'error' => [ 'code' => -32700, 'message' => 'Parse error: empty body' ] |
| 607 | ], 400 ); |
| 608 | } |
| 609 | |
| 610 | $data = json_decode( $raw_body, true ); |
| 611 | |
| 612 | if ( json_last_error() !== JSON_ERROR_NONE ) { |
| 613 | return new WP_REST_Response( [ |
| 614 | 'jsonrpc' => '2.0', |
| 615 | 'id' => null, |
| 616 | 'error' => [ 'code' => -32700, 'message' => 'Parse error: invalid JSON' ] |
| 617 | ], 400 ); |
| 618 | } |
| 619 | |
| 620 | // Log the request if debugging is enabled |
| 621 | if ( $this->logging && isset( $data['method'] ) ) { |
| 622 | error_log( '[AI Engine MCP HTTP] ↓ ' . $data['method'] ); |
| 623 | } |
| 624 | |
| 625 | // Reuse the existing direct JSON-RPC handler |
| 626 | return $this->handle_direct_jsonrpc( $request, $data ); |
| 627 | } |
| 628 | |
| 629 | /** |
| 630 | * Handle GET requests for Streamable HTTP. |
| 631 | * This opens an SSE stream for server-to-client messages. |
| 632 | * Used when the server needs to send notifications or progress updates. |
| 633 | */ |
| 634 | private function handle_streamable_http_get( WP_REST_Request $request ) { |
| 635 | // Check Accept header - must accept text/event-stream |
| 636 | $accept = $request->get_header( 'accept' ); |
| 637 | if ( strpos( $accept, 'text/event-stream' ) === false ) { |
| 638 | return new WP_REST_Response( [ |
| 639 | 'error' => 'Accept header must include text/event-stream' |
| 640 | ], 406 ); |
| 641 | } |
| 642 | |
| 643 | // Get or create session ID |
| 644 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 645 | $session_id = !empty( $session_header ) ? sanitize_text_field( $session_header ) : wp_generate_uuid4(); |
| 646 | |
| 647 | if ( $this->logging ) { |
| 648 | error_log( '[AI Engine MCP HTTP] 📡 SSE stream opened for session: ' . substr( $session_id, 0, 8 ) . '...' ); |
| 649 | } |
| 650 | |
| 651 | // Set up SSE output |
| 652 | @ini_set( 'zlib.output_compression', '0' ); |
| 653 | @ini_set( 'output_buffering', '0' ); |
| 654 | @ini_set( 'implicit_flush', '1' ); |
| 655 | if ( function_exists( 'ob_implicit_flush' ) ) { |
| 656 | ob_implicit_flush( true ); |
| 657 | } |
| 658 | |
| 659 | header( 'Content-Type: text/event-stream' ); |
| 660 | header( 'Cache-Control: no-cache' ); |
| 661 | header( 'X-Accel-Buffering: no' ); |
| 662 | header( 'Connection: keep-alive' ); |
| 663 | header( 'Mcp-Session-Id: ' . $session_id ); |
| 664 | |
| 665 | while ( ob_get_level() ) { |
| 666 | ob_end_flush(); |
| 667 | } |
| 668 | |
| 669 | $this->session_id = $session_id; |
| 670 | $this->last_action_time = time(); |
| 671 | |
| 672 | // Send initial connection event |
| 673 | echo "event: open\n"; |
| 674 | echo 'data: {"session":"' . esc_js( $session_id ) . "\"}\n\n"; |
| 675 | flush(); |
| 676 | |
| 677 | $max_time = $this->logging ? 30 : 60 * 3; |
| 678 | /** |
| 679 | * How long an idle SSE stream may hold a PHP worker, in seconds. |
| 680 | * |
| 681 | * Each open stream occupies one worker until this elapses, so a client that opens |
| 682 | * streams without ever sending DELETE can pin the whole pool on a small host. |
| 683 | * Lower this when that happens; the client simply reconnects. |
| 684 | * |
| 685 | * Resolved once per stream, not inside the loop below, which spins five times a second. |
| 686 | * |
| 687 | * @param int $max_time Seconds. 180 normally, 30 when MCP logging is enabled. |
| 688 | * @param string $session_id The session this stream belongs to. |
| 689 | */ |
| 690 | $max_time = (int) apply_filters( 'mwai_mcp_stream_max_time', $max_time, $session_id ); |
| 691 | if ( $max_time < 5 ) { |
| 692 | $max_time = 5; |
| 693 | } |
| 694 | |
| 695 | // Main SSE loop - listen for server-initiated messages |
| 696 | while ( true ) { |
| 697 | $idle = ( time() - $this->last_action_time ) >= $max_time; |
| 698 | |
| 699 | if ( connection_aborted() || $idle ) { |
| 700 | if ( $this->logging ) { |
| 701 | error_log( '[AI Engine MCP HTTP] 🔚 SSE closed (' . ( $idle ? 'idle' : 'abort' ) . ')' ); |
| 702 | } |
| 703 | break; |
| 704 | } |
| 705 | |
| 706 | // Check for queued messages |
| 707 | foreach ( $this->fetch_messages( $session_id ) as $msg ) { |
| 708 | if ( isset( $msg['method'] ) && $msg['method'] === 'mwai/kill' ) { |
| 709 | echo "event: close\ndata: {}\n\n"; |
| 710 | flush(); |
| 711 | exit; |
| 712 | } |
| 713 | |
| 714 | echo "event: message\n"; |
| 715 | echo 'data: ' . wp_json_encode( $msg, JSON_UNESCAPED_UNICODE ) . "\n\n"; |
| 716 | flush(); |
| 717 | $this->last_action_time = time(); |
| 718 | } |
| 719 | |
| 720 | // Heartbeat every 10 seconds |
| 721 | $time_since_last = time() - $this->last_action_time; |
| 722 | if ( $time_since_last >= 10 && $time_since_last % 10 === 0 ) { |
| 723 | echo ": heartbeat\n\n"; |
| 724 | flush(); |
| 725 | } |
| 726 | |
| 727 | usleep( 200000 ); // 200ms |
| 728 | } |
| 729 | |
| 730 | exit; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * Handle DELETE requests for Streamable HTTP. |
| 735 | * This terminates the session and cleans up any resources. |
| 736 | */ |
| 737 | private function handle_streamable_http_delete( WP_REST_Request $request ) { |
| 738 | $session_header = $request->get_header( 'mcp-session-id' ); |
| 739 | |
| 740 | if ( empty( $session_header ) ) { |
| 741 | return new WP_REST_Response( [ |
| 742 | 'error' => 'Mcp-Session-Id header required' |
| 743 | ], 400 ); |
| 744 | } |
| 745 | |
| 746 | $session_id = sanitize_text_field( $session_header ); |
| 747 | |
| 748 | if ( $this->logging ) { |
| 749 | error_log( '[AI Engine MCP HTTP] 🗑️ Session terminated: ' . substr( $session_id, 0, 8 ) . '...' ); |
| 750 | } |
| 751 | |
| 752 | // Queue kill signal for any active SSE streams |
| 753 | $this->store_message( $session_id, [ |
| 754 | 'jsonrpc' => '2.0', |
| 755 | 'method' => 'mwai/kill' |
| 756 | ] ); |
| 757 | |
| 758 | // Clean up any remaining transients for this session |
| 759 | global $wpdb; |
| 760 | $like = $wpdb->esc_like( '_transient_' . "{$this->queue_key}_{$session_id}_" ) . '%'; |
| 761 | $wpdb->query( |
| 762 | $wpdb->prepare( |
| 763 | "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s", |
| 764 | $like |
| 765 | ) |
| 766 | ); |
| 767 | |
| 768 | // Return 204 No Content on successful termination |
| 769 | return new WP_REST_Response( null, 204 ); |
| 770 | } |
| 771 | #endregion |
| 772 | |
| 773 | #region Access Control |
| 774 | /** |
| 775 | * Whether the Access Level setting narrows this request. |
| 776 | * |
| 777 | * It governs the shared bearer token, which is what its description has always |
| 778 | * said: one secret handed to a script, so the owner decides how far it reaches. |
| 779 | * An OAuth connection is the opposite case. It belongs to one person who signed |
| 780 | * in as themselves, and the authorize step already refuses anyone without |
| 781 | * manage_options, so narrowing them again by a global role meant an |
| 782 | * administrator on Claude Desktop silently lost every admin-level tool, with no |
| 783 | * reason given and no setting on screen to explain it (the selector only appears |
| 784 | * when a bearer token is configured). |
| 785 | * |
| 786 | * Both the listing and the execution gate call this. They used to decide it |
| 787 | * separately, which is how they drifted apart in the first place. |
| 788 | */ |
| 789 | private function role_filter_applies(): bool { |
| 790 | return $this->auth_method !== 'oauth' && $this->mcp_role !== 'admin'; |
| 791 | } |
| 792 | |
| 793 | private function role_has_access( string $toolLevel ): bool { |
| 794 | if ( $this->mcp_role === 'admin' ) { |
| 795 | return true; |
| 796 | } |
| 797 | if ( $this->mcp_role === 'readwrite' ) { |
| 798 | return in_array( $toolLevel, [ 'read', 'write' ] ); |
| 799 | } |
| 800 | if ( $this->mcp_role === 'readonly' ) { |
| 801 | return $toolLevel === 'read'; |
| 802 | } |
| 803 | return false; |
| 804 | } |
| 805 | #endregion |
| 806 | |
| 807 | #region Tools Definitions |
| 808 | private function get_tools_list() { |
| 809 | $base_tools = [ |
| 810 | [ |
| 811 | 'name' => 'mcp_ping', |
| 812 | '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.', |
| 813 | 'inputSchema' => [ |
| 814 | 'type' => 'object', |
| 815 | 'properties' => (object) [], |
| 816 | 'required' => [] |
| 817 | ], |
| 818 | 'annotations' => [ |
| 819 | 'readOnlyHint' => true, |
| 820 | 'destructiveHint' => false, |
| 821 | 'openWorldHint' => false, |
| 822 | ], |
| 823 | 'accessLevel' => 'read', |
| 824 | ], |
| 825 | ]; |
| 826 | |
| 827 | if ( $this->logging ) { |
| 828 | error_log( '[AI Engine MCP] 🔧 get_tools_list() - Starting with ' . count( $base_tools ) . ' base tools' ); |
| 829 | } |
| 830 | |
| 831 | $filtered_tools = apply_filters( 'mwai_mcp_tools', $base_tools ); |
| 832 | |
| 833 | if ( $this->logging ) { |
| 834 | error_log( '[AI Engine MCP] 🔧 get_tools_list() - After filters: ' . count( $filtered_tools ) . ' tools' ); |
| 835 | } |
| 836 | |
| 837 | // Build access level map for defense-in-depth checks in execute_tool() |
| 838 | foreach ( $filtered_tools as $tool ) { |
| 839 | if ( isset( $tool['name'] ) ) { |
| 840 | $this->tool_access_levels[ $tool['name'] ] = $tool['accessLevel'] ?? 'admin'; |
| 841 | } |
| 842 | } |
| 843 | |
| 844 | // Filter tools by access level based on the MCP role. |
| 845 | // |
| 846 | // This applies to the shared bearer token only, which is what the setting has |
| 847 | // always described: one secret handed to a script, so the site owner decides |
| 848 | // how far it reaches. An OAuth connection is the opposite case. It belongs to |
| 849 | // one person, they signed in as themselves, and authorize_token() already |
| 850 | // refuses anyone without manage_options, so filtering them again by a global |
| 851 | // role meant an administrator on Claude Desktop silently lost every |
| 852 | // admin-level tool with no visible reason and no setting on screen to explain |
| 853 | // it (the selector only appears when a bearer token is configured). |
| 854 | if ( $this->role_filter_applies() ) { |
| 855 | $filtered_tools = array_filter( $filtered_tools, function ( $tool ) { |
| 856 | $level = $tool['accessLevel'] ?? 'admin'; |
| 857 | return $this->role_has_access( $level ); |
| 858 | } ); |
| 859 | } |
| 860 | |
| 861 | $normalized_tools = []; |
| 862 | foreach ( $filtered_tools as $tool_index => $tool_definition ) { |
| 863 | $normalized = $this->normalize_tool_definition( $tool_definition, $tool_index ); |
| 864 | if ( $normalized ) { |
| 865 | $normalized_tools[] = $normalized; |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | if ( $this->logging ) { |
| 870 | error_log( '[AI Engine MCP] 🔧 get_tools_list() - Normalized tools: ' . count( $normalized_tools ) ); |
| 871 | } |
| 872 | |
| 873 | return $normalized_tools; |
| 874 | } |
| 875 | #endregion |
| 876 | |
| 877 | #region Resources Definitions |
| 878 | private function get_resources_list() { |
| 879 | return []; |
| 880 | } |
| 881 | #endregion |
| 882 | |
| 883 | #region Prompts Definitions |
| 884 | private function get_prompts_list() { |
| 885 | return []; |
| 886 | } |
| 887 | #endregion |
| 888 | |
| 889 | #region Tool Normalization Helpers |
| 890 | private function normalize_tool_definition( $tool, $index ) { |
| 891 | // NOTE: tool-registration warnings below are always emitted (no $this->logging |
| 892 | // gate). Each fires only when a tool is silently auto-fixed or auto-skipped at |
| 893 | // registration — exactly the case where the author needs to know. They're rare |
| 894 | // in normal operation and the only reliable diagnostic when something is off. |
| 895 | if ( !is_array( $tool ) ) { |
| 896 | error_log( '[AI Engine MCP] ⚠️ Tool definition at index ' . $index . ' skipped (expected array).' ); |
| 897 | return null; |
| 898 | } |
| 899 | |
| 900 | $name = isset( $tool['name'] ) ? trim( (string) $tool['name'] ) : ''; |
| 901 | if ( $name === '' ) { |
| 902 | error_log( '[AI Engine MCP] ⚠️ Tool skipped due to missing name at index ' . $index ); |
| 903 | return null; |
| 904 | } |
| 905 | |
| 906 | $normalized_schema = $this->normalize_input_schema( $tool['inputSchema'] ?? null, $name ); |
| 907 | if ( !$normalized_schema ) { |
| 908 | error_log( '[AI Engine MCP] ⚠️ Tool "' . $name . '" skipped due to invalid input schema.' ); |
| 909 | return null; |
| 910 | } |
| 911 | |
| 912 | $normalized = [ |
| 913 | 'name' => $name, |
| 914 | 'inputSchema' => $normalized_schema, |
| 915 | ]; |
| 916 | |
| 917 | if ( isset( $tool['description'] ) && $tool['description'] !== '' ) { |
| 918 | $normalized['description'] = wp_strip_all_tags( (string) $tool['description'] ); |
| 919 | } |
| 920 | |
| 921 | if ( isset( $tool['annotations'] ) && is_array( $tool['annotations'] ) ) { |
| 922 | $annotations = $this->normalize_annotations( $tool['annotations'], $name ); |
| 923 | if ( !empty( $annotations ) ) { |
| 924 | $normalized['annotations'] = $annotations; |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | return $normalized; |
| 929 | } |
| 930 | |
| 931 | private function normalize_input_schema( $schema, string $tool_name ) { |
| 932 | if ( !is_array( $schema ) ) { |
| 933 | return null; |
| 934 | } |
| 935 | |
| 936 | $type = isset( $schema['type'] ) ? (string) $schema['type'] : 'object'; |
| 937 | if ( $type !== 'object' ) { |
| 938 | error_log( '[AI Engine MCP] ⚠️ Tool "' . $tool_name . '" has unsupported schema type: ' . $type ); |
| 939 | return null; |
| 940 | } |
| 941 | |
| 942 | $properties = []; |
| 943 | if ( isset( $schema['properties'] ) && ( is_array( $schema['properties'] ) || is_object( $schema['properties'] ) ) ) { |
| 944 | foreach ( (array) $schema['properties'] as $prop_name => $definition ) { |
| 945 | if ( !is_array( $definition ) ) { |
| 946 | $definition = []; |
| 947 | } |
| 948 | |
| 949 | if ( isset( $definition['type'] ) ) { |
| 950 | // Validate type definition |
| 951 | if ( is_array( $definition['type'] ) ) { |
| 952 | // Array of types (union types) - validate they're compatible with MCP clients |
| 953 | $type_array = array_map( 'strval', $definition['type'] ); |
| 954 | |
| 955 | // Check for complex types that need additional schema details |
| 956 | $complex_types = array_intersect( $type_array, [ 'object', 'array' ] ); |
| 957 | if ( !empty( $complex_types ) ) { |
| 958 | error_log( |
| 959 | '[AI Engine MCP] ⚠️ Tool "' . $tool_name . '" property "' . $prop_name . |
| 960 | '" has problematic union type with complex types: [' . implode( ', ', $type_array ) . |
| 961 | ']. This breaks ChatGPT. Auto-fixing by removing type constraint.' |
| 962 | ); |
| 963 | // Auto-fix: Remove the type constraint to accept any value |
| 964 | unset( $definition['type'] ); |
| 965 | // Keep description if present, or add one |
| 966 | if ( !isset( $definition['description'] ) ) { |
| 967 | $definition['description'] = 'Value can be of any type'; |
| 968 | } |
| 969 | } |
| 970 | else { |
| 971 | $definition['type'] = $type_array; |
| 972 | } |
| 973 | } |
| 974 | else { |
| 975 | $definition['type'] = (string) $definition['type']; |
| 976 | } |
| 977 | } |
| 978 | |
| 979 | $properties[ $prop_name ] = $definition; |
| 980 | } |
| 981 | } |
| 982 | |
| 983 | $required = []; |
| 984 | if ( isset( $schema['required'] ) && is_array( $schema['required'] ) ) { |
| 985 | foreach ( $schema['required'] as $field ) { |
| 986 | $field_name = trim( (string) $field ); |
| 987 | if ( $field_name !== '' ) { |
| 988 | $required[] = $field_name; |
| 989 | } |
| 990 | } |
| 991 | $required = array_values( array_unique( $required ) ); |
| 992 | } |
| 993 | |
| 994 | $normalized = [ |
| 995 | 'type' => 'object', |
| 996 | 'properties' => empty( $properties ) ? new stdClass() : $properties, |
| 997 | ]; |
| 998 | |
| 999 | if ( !empty( $required ) ) { |
| 1000 | $normalized['required'] = $required; |
| 1001 | } |
| 1002 | |
| 1003 | if ( array_key_exists( 'additionalProperties', $schema ) ) { |
| 1004 | $normalized['additionalProperties'] = (bool) $schema['additionalProperties']; |
| 1005 | } |
| 1006 | |
| 1007 | return $normalized; |
| 1008 | } |
| 1009 | |
| 1010 | private function normalize_annotations( array $annotations, string $tool_name ): array { |
| 1011 | $allowed_keys = [ 'title', 'readOnlyHint', 'destructiveHint', 'idempotentHint', 'openWorldHint' ]; |
| 1012 | $normalized = []; |
| 1013 | |
| 1014 | foreach ( $annotations as $key => $value ) { |
| 1015 | if ( !in_array( $key, $allowed_keys, true ) ) { |
| 1016 | continue; |
| 1017 | } |
| 1018 | |
| 1019 | if ( in_array( $key, [ 'readOnlyHint', 'destructiveHint', 'idempotentHint', 'openWorldHint' ], true ) ) { |
| 1020 | $normalized[ $key ] = (bool) $value; |
| 1021 | } |
| 1022 | elseif ( $key === 'title' ) { |
| 1023 | $normalized['title'] = wp_strip_all_tags( (string) $value ); |
| 1024 | } |
| 1025 | } |
| 1026 | |
| 1027 | if ( empty( $normalized ) && $this->logging && !empty( $annotations ) ) { |
| 1028 | error_log( '[AI Engine MCP] 🔎 Tool "' . $tool_name . '" included unsupported annotation keys.' ); |
| 1029 | } |
| 1030 | |
| 1031 | return $normalized; |
| 1032 | } |
| 1033 | #endregion |
| 1034 | |
| 1035 | #region Tools Call (execute_tool) |
| 1036 | |
| 1037 | // Armed while a tool runs, so the shutdown net below can answer for it. |
| 1038 | private static $currentToolCall = null; |
| 1039 | private static $shutdownNetRegistered = false; |
| 1040 | // Emergency memory reserve, released by the net so it can run even after an |
| 1041 | // out-of-memory fatal on hosts where ini_set is disabled. |
| 1042 | private static $memoryReserve = null; |
| 1043 | |
| 1044 | /** |
| 1045 | * A tool callback that dies hard (out of memory, fatal error) would end the |
| 1046 | * request as a raw 500 with an empty body, and MCP clients then treat the |
| 1047 | * WHOLE server as unreachable (Anthropic aborts the conversation with |
| 1048 | * "Connection error while communicating with MCP server"). This shutdown |
| 1049 | * net answers with a valid JSON-RPC tool error instead, so only the tool |
| 1050 | * fails and the client/model can react to it. |
| 1051 | */ |
| 1052 | private function arm_fatal_net( $tool, $id ) { |
| 1053 | self::$currentToolCall = [ 'tool' => $tool, 'id' => $id ]; |
| 1054 | if ( self::$memoryReserve === null ) { |
| 1055 | self::$memoryReserve = str_repeat( 'x', 2 * 1024 * 1024 ); |
| 1056 | } |
| 1057 | if ( self::$shutdownNetRegistered ) { |
| 1058 | return; |
| 1059 | } |
| 1060 | self::$shutdownNetRegistered = true; |
| 1061 | // WordPress's own fatal handler runs first (registered at bootstrap) and |
| 1062 | // exits after printing its "critical error" 500, which would keep our net |
| 1063 | // from ever running. WP_SANDBOX_SCRAPING is core's shutdown-time escape |
| 1064 | // hatch for "the request handles fatals itself" (the enabled filter is |
| 1065 | // only consulted at bootstrap, so it cannot be used here). |
| 1066 | if ( !defined( 'WP_SANDBOX_SCRAPING' ) ) { |
| 1067 | define( 'WP_SANDBOX_SCRAPING', true ); |
| 1068 | } |
| 1069 | register_shutdown_function( function () { |
| 1070 | $ctx = self::$currentToolCall; |
| 1071 | if ( empty( $ctx ) ) { |
| 1072 | return; |
| 1073 | } |
| 1074 | $err = error_get_last(); |
| 1075 | if ( !$err || !in_array( $err['type'], [ E_ERROR, E_PARSE, E_CORE_ERROR, E_COMPILE_ERROR ], true ) ) { |
| 1076 | return; |
| 1077 | } |
| 1078 | // An OOM can leave ZERO headroom, killing this emitter itself. Free the |
| 1079 | // reserve first (works everywhere), then lift the limit where allowed |
| 1080 | // (the request is over anyway). |
| 1081 | self::$memoryReserve = null; |
| 1082 | @ini_set( 'memory_limit', '-1' ); |
| 1083 | // Discard any partial/buffered output so the JSON is the only body. |
| 1084 | while ( ob_get_level() > 0 ) { |
| 1085 | @ob_end_clean(); |
| 1086 | } |
| 1087 | if ( !headers_sent() ) { |
| 1088 | http_response_code( 200 ); |
| 1089 | header( 'Content-Type: application/json' ); |
| 1090 | } |
| 1091 | $msg = 'The tool "' . $ctx['tool'] . '" crashed on this site (' . |
| 1092 | substr( $err['message'], 0, 300 ) . '). The other tools should still work.'; |
| 1093 | echo '{"jsonrpc":"2.0","id":' . json_encode( $ctx['id'] ) . |
| 1094 | ',"result":{"content":[{"type":"text","text":' . json_encode( $msg ) . '}],"isError":true}}'; |
| 1095 | } ); |
| 1096 | } |
| 1097 | |
| 1098 | private function execute_tool( $tool, $args, $id ) { |
| 1099 | $start = microtime( true ); |
| 1100 | $response = null; |
| 1101 | $status = 'error'; |
| 1102 | $error_msg = null; |
| 1103 | $this->arm_fatal_net( $tool, $id ); |
| 1104 | try { |
| 1105 | // Ensure tool access levels are populated (each HTTP request starts fresh) |
| 1106 | if ( empty( $this->tool_access_levels ) ) { |
| 1107 | $this->get_tools_list(); |
| 1108 | } |
| 1109 | |
| 1110 | // Defense in depth: verify tool access even if it wasn't filtered from the listing |
| 1111 | $tool_level = $this->tool_access_levels[ $tool ] ?? 'admin'; |
| 1112 | if ( $this->role_filter_applies() && !$this->role_has_access( $tool_level ) ) { |
| 1113 | $error_msg = "Access denied: tool '{$tool}' requires '{$tool_level}' access."; |
| 1114 | $response = $this->rpc_error( $id, -32600, $error_msg ); |
| 1115 | return $response; |
| 1116 | } |
| 1117 | |
| 1118 | // Handle built-in tools first |
| 1119 | if ( $tool === 'mcp_ping' ) { |
| 1120 | if ( $this->logging ) { |
| 1121 | $this->log( '🛠️ Tool: mcp_ping' ); |
| 1122 | } |
| 1123 | $ping_data = [ |
| 1124 | 'time' => gmdate( 'Y-m-d H:i:s' ), |
| 1125 | 'name' => get_bloginfo( 'name' ), |
| 1126 | ]; |
| 1127 | $response = [ |
| 1128 | 'jsonrpc' => '2.0', |
| 1129 | 'id' => $id, |
| 1130 | 'result' => [ |
| 1131 | 'content' => [ |
| 1132 | [ |
| 1133 | 'type' => 'text', |
| 1134 | 'text' => 'Ping successful: ' . wp_json_encode( $ping_data, JSON_PRETTY_PRINT ), |
| 1135 | ], |
| 1136 | ], |
| 1137 | 'data' => $ping_data, |
| 1138 | ], |
| 1139 | ]; |
| 1140 | $status = 'success'; |
| 1141 | return $response; |
| 1142 | } |
| 1143 | |
| 1144 | // Let other modules handle their tools |
| 1145 | if ( $this->logging ) { |
| 1146 | // Log tool calls with more context |
| 1147 | $args_preview = ''; |
| 1148 | if ( !empty( $args ) ) { |
| 1149 | // Show key args for common tools |
| 1150 | if ( isset( $args['ID'] ) ) { |
| 1151 | $args_preview = ' (ID: ' . $args['ID'] . ')'; |
| 1152 | } |
| 1153 | elseif ( isset( $args['query'] ) ) { |
| 1154 | $args_preview = ' (query: "' . substr( $args['query'], 0, 30 ) . '...")'; |
| 1155 | } |
| 1156 | elseif ( isset( $args['message'] ) ) { |
| 1157 | $args_preview = ' (message: "' . substr( $args['message'], 0, 30 ) . '...")'; |
| 1158 | } |
| 1159 | } |
| 1160 | // Log to both error log and UI |
| 1161 | error_log( '[AI Engine MCP] 🛠️ ' . $tool . $args_preview ); |
| 1162 | $this->log( '🛠️ Tool: ' . $tool . $args_preview ); |
| 1163 | } |
| 1164 | $filtered = apply_filters( 'mwai_mcp_callback', null, $tool, $args, $id, $this ); |
| 1165 | |
| 1166 | if ( $filtered !== null ) { |
| 1167 | // Check if it's already a full JSON-RPC response (backward compatibility) |
| 1168 | if ( is_array( $filtered ) && isset( $filtered['jsonrpc'] ) && isset( $filtered['id'] ) ) { |
| 1169 | $response = $filtered; |
| 1170 | $status = isset( $filtered['error'] ) ? 'error' : 'success'; |
| 1171 | if ( $status === 'error' ) { |
| 1172 | $error_msg = $filtered['error']['message'] ?? null; |
| 1173 | } |
| 1174 | return $response; |
| 1175 | } |
| 1176 | |
| 1177 | // Otherwise, wrap the result in proper JSON-RPC format |
| 1178 | $response = [ |
| 1179 | 'jsonrpc' => '2.0', |
| 1180 | 'id' => $id, |
| 1181 | 'result' => $this->format_tool_result( $filtered ), |
| 1182 | ]; |
| 1183 | $status = 'success'; |
| 1184 | return $response; |
| 1185 | } |
| 1186 | |
| 1187 | throw new Exception( "Unknown tool: {$tool}" ); |
| 1188 | } |
| 1189 | catch ( Throwable $e ) { |
| 1190 | // A failing tool is reported as a tool-level error (isError result), |
| 1191 | // NOT a JSON-RPC protocol error: clients treat protocol errors as a |
| 1192 | // broken server, while an isError result lets the model read the |
| 1193 | // message and adapt. Throwable also catches TypeError & friends. |
| 1194 | $error_msg = $e->getMessage(); |
| 1195 | $response = [ |
| 1196 | 'jsonrpc' => '2.0', |
| 1197 | 'id' => $id, |
| 1198 | 'result' => [ |
| 1199 | 'content' => [ |
| 1200 | [ |
| 1201 | 'type' => 'text', |
| 1202 | 'text' => 'The tool "' . $tool . '" failed: ' . $error_msg, |
| 1203 | ], |
| 1204 | ], |
| 1205 | 'isError' => true, |
| 1206 | ], |
| 1207 | ]; |
| 1208 | return $response; |
| 1209 | } |
| 1210 | finally { |
| 1211 | self::$currentToolCall = null; |
| 1212 | $duration_ms = (int) round( ( microtime( true ) - $start ) * 1000 ); |
| 1213 | // Fire the action even on access denials and errors so admins can see |
| 1214 | // attempted-but-blocked tool calls in MCP Logs. |
| 1215 | do_action( 'mwai_mcp_tool_called', [ |
| 1216 | 'tool' => $tool, |
| 1217 | 'args' => $args, |
| 1218 | 'result' => $response, |
| 1219 | 'status' => $status, |
| 1220 | 'error_msg' => $error_msg, |
| 1221 | 'duration_ms' => $duration_ms, |
| 1222 | 'client_id' => $this->auth_client_id, |
| 1223 | 'client_name' => $this->auth_client_name, |
| 1224 | 'auth_method' => $this->auth_method, |
| 1225 | 'request_id' => $id, |
| 1226 | 'user_id' => get_current_user_id(), |
| 1227 | ] ); |
| 1228 | } |
| 1229 | } |
| 1230 | #endregion |
| 1231 | |
| 1232 | #region Handle /upload (one-time file upload via token) |
| 1233 | public function handle_upload( WP_REST_Request $request ) { |
| 1234 | $token = $request->get_param( 'token' ); |
| 1235 | if ( empty( $token ) ) { |
| 1236 | return new WP_REST_Response( [ 'success' => false, 'message' => 'Missing token.' ], 400 ); |
| 1237 | } |
| 1238 | |
| 1239 | $transient_key = 'mwai_mcp_upload_' . $token; |
| 1240 | $data = get_transient( $transient_key ); |
| 1241 | if ( empty( $data ) ) { |
| 1242 | return new WP_REST_Response( [ 'success' => false, 'message' => 'Invalid or expired upload token.' ], 403 ); |
| 1243 | } |
| 1244 | |
| 1245 | // Immediately delete the transient so the token can only be used once |
| 1246 | delete_transient( $transient_key ); |
| 1247 | |
| 1248 | $files = $request->get_file_params(); |
| 1249 | if ( empty( $files['file'] ) ) { |
| 1250 | return new WP_REST_Response( [ 'success' => false, 'message' => 'No file provided. Use: curl -X POST -F "file=@/path/to/file" "<url>"' ], 400 ); |
| 1251 | } |
| 1252 | |
| 1253 | $uploaded = $files['file']; |
| 1254 | if ( $uploaded['error'] !== UPLOAD_ERR_OK ) { |
| 1255 | return new WP_REST_Response( [ 'success' => false, 'message' => 'Upload error code: ' . $uploaded['error'] ], 400 ); |
| 1256 | } |
| 1257 | |
| 1258 | // Set admin context for media handling |
| 1259 | if ( !current_user_can( 'administrator' ) ) { |
| 1260 | wp_set_current_user( 1 ); |
| 1261 | } |
| 1262 | |
| 1263 | require_once ABSPATH . 'wp-admin/includes/file.php'; |
| 1264 | require_once ABSPATH . 'wp-admin/includes/media.php'; |
| 1265 | require_once ABSPATH . 'wp-admin/includes/image.php'; |
| 1266 | |
| 1267 | // Use the filename from the transient (sanitized at creation time) |
| 1268 | $file = [ |
| 1269 | 'name' => $data['filename'], |
| 1270 | 'tmp_name' => $uploaded['tmp_name'], |
| 1271 | ]; |
| 1272 | |
| 1273 | $attachment_id = media_handle_sideload( $file, 0, $data['description'] ); |
| 1274 | if ( is_wp_error( $attachment_id ) ) { |
| 1275 | return new WP_REST_Response( [ 'success' => false, 'message' => $attachment_id->get_error_message() ], 500 ); |
| 1276 | } |
| 1277 | |
| 1278 | if ( !empty( $data['title'] ) ) { |
| 1279 | wp_update_post( [ 'ID' => $attachment_id, 'post_title' => sanitize_text_field( $data['title'] ) ] ); |
| 1280 | } |
| 1281 | if ( !empty( $data['alt'] ) ) { |
| 1282 | update_post_meta( $attachment_id, '_wp_attachment_image_alt', sanitize_text_field( $data['alt'] ) ); |
| 1283 | } |
| 1284 | |
| 1285 | return new WP_REST_Response( [ |
| 1286 | 'success' => true, |
| 1287 | 'attachment_id' => $attachment_id, |
| 1288 | 'url' => wp_get_attachment_url( $attachment_id ), |
| 1289 | ], 200 ); |
| 1290 | } |
| 1291 | #endregion |
| 1292 | |
| 1293 | #region Message Queue (per-message transient) |
| 1294 | private function transient_key( $sess, $id ) { |
| 1295 | return "{$this->queue_key}_{$sess}_{$id}"; |
| 1296 | } |
| 1297 | |
| 1298 | private function store_message( $sess, $payload ) { |
| 1299 | if ( !$sess ) { |
| 1300 | return; |
| 1301 | } |
| 1302 | $idKey = array_key_exists( 'id', $payload ) ? ( $payload['id'] ?? 'NULL' ) : 'N/A'; |
| 1303 | set_transient( $this->transient_key( $sess, $idKey ), $payload, 30 ); |
| 1304 | $this->log( "queued #{$idKey}" ); |
| 1305 | } |
| 1306 | |
| 1307 | private function fetch_messages( $sess ) { |
| 1308 | global $wpdb; |
| 1309 | $like = $wpdb->esc_like( '_transient_' . "{$this->queue_key}_{$sess}_" ) . '%'; |
| 1310 | |
| 1311 | $rows = $wpdb->get_results( |
| 1312 | $wpdb->prepare( |
| 1313 | "SELECT option_name, option_value FROM {$wpdb->options} WHERE option_name LIKE %s", |
| 1314 | $like |
| 1315 | ), |
| 1316 | ARRAY_A |
| 1317 | ); |
| 1318 | |
| 1319 | $msgs = []; |
| 1320 | foreach ( $rows as $r ) { |
| 1321 | $msgs[] = maybe_unserialize( $r['option_value'] ); |
| 1322 | delete_option( $r['option_name'] ); |
| 1323 | } |
| 1324 | usort( $msgs, fn ( $a, $b ) => ( $a['id'] ?? 0 ) <=> ( $b['id'] ?? 0 ) ); |
| 1325 | if ( $msgs ) { |
| 1326 | $this->log( 'flush ' . count( $msgs ) . ' msg(s)' ); |
| 1327 | } |
| 1328 | return $msgs; |
| 1329 | } |
| 1330 | #endregion |
| 1331 | |
| 1332 | #region Resources (note) |
| 1333 | /*--------------------------------------------------*/ |
| 1334 | /** |
| 1335 | * MCP also supports “resources” – static or dynamic data a client can |
| 1336 | * retrieve by URL (e.g. `mcp://resource/posts/123`). |
| 1337 | */ |
| 1338 | #endregion |
| 1339 | } |
| 1340 |