Hugging Face MCP Server

// json-rpc-errors.ts export const JSON_RPC_ERROR_CODES = { // Standard JSON-RPC 2.0 error codes PARSE_ERROR: -32700, INVALID_REQUEST: -32600, METHOD_NOT_FOUND: -32601, INVALID_PARAMS: -32602, INTERNAL_ERROR: -32603, // Server error codes (-32000 to -32099) SERVER_ERROR: -32000, SESSION_NOT_FOUND: -32001, SERVER_SHUTTING_DOWN: -32002, SESSION_ALREADY_EXISTS: -32003, STALE_CONNECTION: -32004, AUTHENTICATION_FAILED: -32005, } as const; export type JsonRpcErrorCode = (typeof JSON_RPC_ERROR_CODES)[keyof typeof JSON_RPC_ERROR_CODES]; export interface JsonRpcError { jsonrpc: '2.0'; error: { code: JsonRpcErrorCode; message: string; data?: unknown; }; id: string | number | null; } /** * Create a JSON-RPC 2.0 error response */ export function createJsonRpcError( code: JsonRpcErrorCode, message: string, id: string | number | null = null, data?: unknown ): JsonRpcError { const error: JsonRpcError = { jsonrpc: '2.0', error: { code, message, }, id, }; if (data !== undefined) { error.error.data = data; } return error; } /** * Safely extract JSON-RPC ID from request body */ export function extractJsonRpcId(body: unknown): string | number | null { if (body && typeof body === 'object' && 'id' in body) { const id = (body as { id: unknown }).id; if (typeof id === 'string') { return id; } if (typeof id === 'number') { return id; } if (id === null) { return null; } } return null; } /** * Common error response factories */ export const JsonRpcErrors = { internalError: (id: string | number | null = null, details?: string) => createJsonRpcError(JSON_RPC_ERROR_CODES.INTERNAL_ERROR, details || 'Internal server error', id), invalidParams: (message: string, id: string | number | null = null) => createJsonRpcError(JSON_RPC_ERROR_CODES.INVALID_PARAMS, `Invalid params: ${message}`, id), sessionNotFound: (sessionId: string, id: string | number | null = null) => createJsonRpcError(JSON_RPC_ERROR_CODES.SESSION_NOT_FOUND, 'Session not found', id, { sessionId }), serverShuttingDown: (id: string | number | null = null) => createJsonRpcError(JSON_RPC_ERROR_CODES.SERVER_SHUTTING_DOWN, 'Server is shutting down', id), sessionAlreadyExists: (sessionId: string, id: string | number | null = null) => createJsonRpcError(JSON_RPC_ERROR_CODES.SESSION_ALREADY_EXISTS, 'Session already exists', id, { sessionId }), methodNotAllowed: (id: string | number | null = null, message: string = 'Method not allowed') => createJsonRpcError(JSON_RPC_ERROR_CODES.SERVER_ERROR, message, id), invalidRequest: (id: string | number | null = null, message: string = 'Invalid request') => createJsonRpcError(JSON_RPC_ERROR_CODES.INVALID_REQUEST, message, id), authenticationFailed: (id: string | number | null = null, message: string = 'Authentication failed') => createJsonRpcError(JSON_RPC_ERROR_CODES.AUTHENTICATION_FAILED, message, id), } as const;