233 lines
8.8 KiB
PHP
233 lines
8.8 KiB
PHP
<?php
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namespace AskTamMCP\MCP;
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defined('ABSPATH') || exit;
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/**
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* MCP Server — Streamable HTTP transport (2025-03-26 spec).
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*
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* Claude.ai uses POST /sse for all communication (not GET SSE stream).
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* Each POST carries a JSON-RPC message and gets a direct JSON response.
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* We also keep GET /sse for legacy clients that expect SSE streams.
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*
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* POST /sse — Claude.ai sends JSON-RPC, gets JSON-RPC response
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* GET /sse — legacy SSE stream for other MCP clients
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* POST /message — explicit message endpoint (also supported)
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*/
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class Server {
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private Registry $registry;
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public function __construct() {
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$this->registry = new Registry();
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}
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public function registerRoutes(): void {
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// SSE endpoint — GET for legacy stream, POST for Claude.ai streamable HTTP
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register_rest_route('asktam-mcp/v1', '/sse', [
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[
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'methods' => 'GET',
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'callback' => [$this, 'handleSseGet'],
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'permission_callback' => '__return_true',
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],
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[
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'methods' => 'POST',
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'callback' => [$this, 'handleSsePost'],
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'permission_callback' => '__return_true',
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],
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]);
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// Explicit message endpoint
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register_rest_route('asktam-mcp/v1', '/message', [
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'methods' => 'POST',
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'callback' => [$this, 'handleMessage'],
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'permission_callback' => '__return_true',
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]);
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register_rest_route('asktam-mcp/v1', '/info', [
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'methods' => 'GET',
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'callback' => [$this, 'handleInfo'],
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'permission_callback' => '__return_true',
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]);
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}
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// -------------------------------------------------------------------------
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// POST /sse — Streamable HTTP transport (Claude.ai 2025+)
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// Each request is a JSON-RPC message, response is JSON-RPC
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// -------------------------------------------------------------------------
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public function handleSsePost(\WP_REST_Request $request): \WP_REST_Response|\WP_Error {
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$auth = \AskTamMCP\Core\Auth::validate($request, \AskTamMCP\Core\Auth::SCOPE_READ);
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if (is_wp_error($auth)) {
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return $auth;
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}
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return $this->dispatchJsonRpc($request, $auth);
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}
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// -------------------------------------------------------------------------
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// GET /sse — Legacy SSE stream for non-Claude.ai clients
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// -------------------------------------------------------------------------
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public function handleSseGet(\WP_REST_Request $request): void {
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$auth = \AskTamMCP\Core\Auth::validate($request, \AskTamMCP\Core\Auth::SCOPE_READ);
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if (is_wp_error($auth)) {
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status_header($auth->get_error_data()['status'] ?? 401);
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header('Content-Type: application/json');
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echo wp_json_encode(['error' => $auth->get_error_message()]);
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exit;
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}
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@set_time_limit(0);
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@ini_set('max_execution_time', 0);
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while (ob_get_level()) ob_end_clean();
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header('Content-Type: text/event-stream; charset=UTF-8');
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header('Cache-Control: no-cache, no-store');
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header('X-Accel-Buffering: no');
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header('Connection: keep-alive');
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header('Access-Control-Allow-Origin: *');
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$messageEndpoint = rest_url('asktam-mcp/v1/message');
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$this->sseEvent('endpoint', $messageEndpoint);
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$this->sseEvent('message', wp_json_encode([
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'jsonrpc' => '2.0',
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'id' => null,
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'result' => [
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'protocolVersion' => '2024-11-05',
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'capabilities' => ['tools' => ['listChanged' => false]],
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'serverInfo' => ['name' => 'advanced-mcp-plugin', 'version' => ASKTAM_MCP_VERSION],
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],
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]));
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$start = time();
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while (!connection_aborted() && (time() - $start) < 270) {
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$this->sseEvent('ping', (string) time());
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for ($i = 0; $i < 15; $i++) {
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if (connection_aborted()) break 2;
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sleep(1);
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}
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}
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echo "retry: 1000\n\n";
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flush();
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exit;
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}
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// -------------------------------------------------------------------------
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// POST /message — explicit endpoint (same as POST /sse)
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// -------------------------------------------------------------------------
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public function handleMessage(\WP_REST_Request $request): \WP_REST_Response|\WP_Error {
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$auth = \AskTamMCP\Core\Auth::validate($request, \AskTamMCP\Core\Auth::SCOPE_READ);
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if (is_wp_error($auth)) {
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return $auth;
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}
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return $this->dispatchJsonRpc($request, $auth);
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}
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public function handleInfo(): \WP_REST_Response {
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return new \WP_REST_Response([
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'name' => 'Advanced MCP Plugin by AskTam',
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'version' => ASKTAM_MCP_VERSION,
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'endpoint' => rest_url('asktam-mcp/v1/sse'),
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'transport' => 'streamable-http',
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'mcp_version' => '2025-03-26',
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]);
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}
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// -------------------------------------------------------------------------
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// Shared JSON-RPC dispatcher
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// -------------------------------------------------------------------------
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private function dispatchJsonRpc(\WP_REST_Request $request, array $auth): \WP_REST_Response {
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$body = $request->get_json_params();
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if (empty($body)) {
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// Claude.ai sometimes sends empty POST to initialize connection
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// Return capabilities immediately
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return $this->rpcResult(null, [
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'protocolVersion' => '2024-11-05',
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'capabilities' => ['tools' => ['listChanged' => false]],
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'serverInfo' => ['name' => 'advanced-mcp-plugin', 'version' => ASKTAM_MCP_VERSION],
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]);
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}
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if (empty($body['method'])) {
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return $this->rpcError(null, -32600, 'Invalid Request: missing method');
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}
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$id = $body['id'] ?? null;
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$method = $body['method'];
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$params = $body['params'] ?? [];
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switch ($method) {
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case 'initialize':
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return $this->rpcResult($id, [
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'protocolVersion' => '2024-11-05',
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'capabilities' => ['tools' => ['listChanged' => false]],
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'serverInfo' => ['name' => 'advanced-mcp-plugin', 'version' => ASKTAM_MCP_VERSION],
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]);
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case 'tools/list':
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return $this->rpcResult($id, ['tools' => $this->registry->getToolDefinitions()]);
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case 'tools/call':
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return $this->handleToolCall($id, $params, $auth);
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case 'notifications/initialized':
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case 'notifications/cancelled':
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return new \WP_REST_Response(null, 204);
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default:
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return $this->rpcError($id, -32601, "Method not found: {$method}");
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}
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}
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private function handleToolCall(mixed $id, array $params, array $authRow): \WP_REST_Response {
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$toolName = $params['name'] ?? '';
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$arguments = $params['arguments'] ?? [];
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if (empty($toolName)) {
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return $this->rpcError($id, -32602, 'Missing tool name');
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}
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$handler = $this->registry->getHandler($toolName);
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if (!$handler) {
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return $this->rpcError($id, -32601, "Unknown tool: {$toolName}");
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}
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$tool = $this->registry->getTool($toolName);
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$required = $tool['scope'] ?? 'read';
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if ($required !== 'read') {
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$keyScopes = array_map('trim', explode(',', $authRow['scopes']));
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if (!in_array($required, $keyScopes, true) && !in_array('admin', $keyScopes, true)) {
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return $this->rpcError($id, -32000, "Insufficient scope. Required: {$required}");
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}
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}
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try {
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$result = $handler($arguments);
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return $this->rpcResult($id, [
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'content' => [
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['type' => 'text', 'text' => is_string($result) ? $result : wp_json_encode($result)],
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],
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]);
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} catch (\Throwable $e) {
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return $this->rpcError($id, -32000, $e->getMessage());
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}
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}
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private function rpcResult(mixed $id, mixed $result): \WP_REST_Response {
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return new \WP_REST_Response(['jsonrpc' => '2.0', 'id' => $id, 'result' => $result]);
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}
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private function rpcError(mixed $id, int $code, string $message): \WP_REST_Response {
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return new \WP_REST_Response(['jsonrpc' => '2.0', 'id' => $id, 'error' => ['code' => $code, 'message' => $message]], 200);
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}
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private function sseEvent(string $event, string $data): void {
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echo "event: {$event}\ndata: {$data}\n\n";
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flush();
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}
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}
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