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import { SSEClientTransport } from '@modelcontextprotocol/sdk/client/sse.js';
import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/streamableHttp.js';
import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { Logger } from '@nestjs/common';
import {
MCPClientConfigV2,
MCPClientType,
RedactionOptions,
ToolFilterMode
} from '../config/types';
import { AuditLogger } from '../redaction/audit-logger';
import { RedactionService } from '../redaction/redaction.service';
export class MCPClientWrapper {
private readonly logger = new Logger(MCPClientWrapper.name);
private client: Client | null = null;
private transport:
| StdioClientTransport
| SSEClientTransport
| StreamableHTTPClientTransport
| null = null;
private name: string;
private config: MCPClientConfigV2;
private needPing = false;
private needManualStart = false;
private pingInterval: NodeJS.Timeout | null = null;
private defaultTimeoutMs = 15000;
private cacheTtlMs = 30000;
private toolsCache: { data: any[]; expiresAt: number } | null = null;
private promptsCache: { data: any[]; expiresAt: number } | null = null;
private resourcesCache: { data: any[]; expiresAt: number } | null = null;
constructor(
name: string,
config: MCPClientConfigV2,
private redactionService: RedactionService
) {
this.name = name;
this.config = config;
}
async initialize(): Promise<void> {
const transportType =
this.config.transportType || this.inferTransportType();
this.logger.log(
`<${ this.name }> Initializing ${ transportType } transport...`
);
// Check if redaction is enabled and service can initialize
Iif (this.config.options?.redaction?.enabled) {
try {
await this.redactionService.initialize();
const keys = this.config.options.redaction.keys || [];
this.logger.log(
`<${ this.name }> Redaction enabled with ${ keys.length } keys`
);
} catch (error) {
this.logger.error(
`<${ this.name }> Redaction service unavailable: ${ error }`
);
throw new Error(
`Redaction service unavailable for client with redaction enabled: ${ error }`
);
}
}
switch (transportType) {
case 'stdio':
await this.initializeStdio();
break;
case 'sse':
await this.initializeSSE();
break;
case 'streamable-http':
await this.initializeStreamableHTTP();
break;
default:
throw new Error(`Unknown transport type: ${ transportType }`);
}
// Initialize MCP client
this.client = new Client(
{
name: 'mcp-proxy',
version: '1.0.0'
},
{
capabilities: {
experimental: {},
roots: {
listChanged: false
}
}
}
);
await this.client.connect(this.transport!);
this.logger.log(`<${ this.name }> Successfully initialized MCP client`);
Eif (this.needPing) {
this.startPingTask();
}
}
private inferTransportType(): MCPClientType {
if (this.config.command) {
return 'stdio';
}
if (this.config.url) {
return 'sse';
}
throw new Error('Cannot infer transport type');
}
private async initializeStdio(): Promise<void> {
if (!this.config.command) {
throw new Error('command is required for stdio transport');
}
const env = { ...process.env, ...this.config.env };
// Suppress verbose logging from child processes unless explicitly enabled
if (!process.env.MCP_DEBUG) {
env.NODE_ENV = env.NODE_ENV || 'production';
// Disable mcp-remote debug mode to reduce log verbosity
env.MCP_REMOTE_DEBUG = 'false';
env.DEBUG = '';
}
const stdioTransport = new StdioClientTransport({
command: this.config.command,
args: this.config.args || [],
env
});
this.transport = stdioTransport;
this.needPing = false;
this.needManualStart = false;
}
private async initializeSSE(): Promise<void> {
if (!this.config.url) {
throw new Error('url is required for SSE transport');
}
const url = new URL(this.config.url);
// For SSE, we need to handle headers differently
// The SDK doesn't directly support headers in SSE client transport
// We may need to implement a custom transport or use fetch with EventSource
// For now, create basic SSE transport
const sseTransport = new SSEClientTransport(url);
this.transport = sseTransport;
this.needPing = true;
this.needManualStart = true;
}
private async initializeStreamableHTTP(): Promise<void> {
Iif (!this.config.url) {
throw new Error('url is required for streamable-http transport');
}
const url = new URL(this.config.url);
const options: { requestInit: { headers?: Record<string, string> } } = {
requestInit: {}
};
// Add headers if provided
Eif (this.config.headers) {
options.requestInit.headers = { ...this.config.headers };
// Temporary debug to confirm upstream auth header presence
const authHeaders = options.requestInit.headers as Record<string, string>;
const authVal = (authHeaders as Record<string, string>).Authorization ||
(authHeaders as Record<string, string>).authorization;
this.logger.log(
[
'<',
this.name,
'> Upstream headers set. Authorization present: ',
String(Boolean(authVal))
].join('')
);
}
// Add timeout if provided
Iif (this.config.timeout) {
// Note: timeout is handled differently in fetch - we'd need to use AbortController
// For now, we'll rely on the SDK's default timeout handling
}
const streamableTransport = new StreamableHTTPClientTransport(url, options);
this.transport = streamableTransport;
this.needPing = true;
this.needManualStart = true;
}
private startPingTask(): void {
// 30 seconds
const interval = 30000;
this.pingInterval = setInterval(async () => {
try {
if (this.client) {
await this.client.ping();
}
} catch (error) {
this.logger.error(`<${ this.name }> MCP Ping failed: ${ error }`);
}
}, interval);
}
async listTools(): Promise<any[]> {
Iif (!this.client) {
throw new Error('Client not initialized');
}
if (this.toolsCache && this.toolsCache.expiresAt > Date.now()) {
return this.toolsCache.data;
}
const timeoutMs = this.config.timeout || this.defaultTimeoutMs;
const response = await this.withTimeout(this.client.listTools({}), timeoutMs, 'listTools');
const tools = (response?.tools || []) as any[];
// Apply tool filtering
const filteredTools = tools.filter(
(tool) => !this.shouldFilterTool(tool.name)
);
this.toolsCache = {
data: filteredTools,
expiresAt: Date.now() + this.cacheTtlMs
};
return this.toolsCache.data;
}
async listPrompts(): Promise<any[]> {
if (!this.client) {
throw new Error('Client not initialized');
}
try {
if (this.promptsCache && this.promptsCache.expiresAt > Date.now()) {
return this.promptsCache.data;
}
const timeoutMs = this.config.timeout || this.defaultTimeoutMs;
const response = await this.withTimeout(this.client.listPrompts({}), timeoutMs, 'listPrompts');
const data = (response?.prompts || []) as any[];
this.promptsCache = { data, expiresAt: Date.now() + this.cacheTtlMs };
return data;
} catch (error: any) {
// If the server doesn't support prompts (Method not found), return empty array
if (error.code === -32601) {
this.logger.debug(`<${ this.name }> Prompts not supported (optional)`);
return [];
}
throw error;
}
}
async listResources(): Promise<any[]> {
if (!this.client) {
throw new Error('Client not initialized');
}
try {
if (this.resourcesCache && this.resourcesCache.expiresAt > Date.now()) {
return this.resourcesCache.data;
}
const timeoutMs = this.config.timeout || this.defaultTimeoutMs;
const response = await this.withTimeout(this.client.listResources({}), timeoutMs, 'listResources');
const data = (response?.resources || []) as any[];
this.resourcesCache = { data, expiresAt: Date.now() + this.cacheTtlMs };
return data;
} catch (error: any) {
// If the server doesn't support resources (Method not found), return empty array
if (error.code === -32601) {
this.logger.debug(
[ '<', this.name, '> Resources not supported (optional)' ].join('')
);
return [];
}
throw error;
}
}
async callTool(
name: string,
args: Record<string, string> | undefined,
redactionConfig?: RedactionOptions
): Promise<any> {
Iif (!this.client) {
throw new Error('Client not initialized');
}
const response = await this.client.callTool({
name,
arguments: args
});
// Apply redaction if enabled
Iif (redactionConfig?.enabled) {
const { matcher } = await this.redactionService.getService();
if (matcher) {
const auditor = redactionConfig.verboseAudit ?
new AuditLogger(this.name) :
null;
const originalResult = JSON.parse(JSON.stringify(response));
const redacted = this.redactionService.redactResponse(
response,
redactionConfig
);
if (auditor) {
auditor.logOperation(
redactionConfig,
'tool_call',
originalResult,
redacted
);
}
return redacted;
}
}
return response;
}
private async withTimeout<T>(promise: Promise<T>, ms: number, opName: string): Promise<T | undefined> {
let timeoutHandle: NodeJS.Timeout | null = null;
try {
const result = await Promise.race([
promise,
new Promise<undefined>((resolve) => {
timeoutHandle = setTimeout(() => {
this.logger.warn([
'<',
this.name,
'> ',
opName,
' timed out after ',
String(ms),
'ms'
].join(''));
resolve(undefined);
}, ms);
})
]);
return result as T | undefined;
} finally {
Eif (timeoutHandle) {
clearTimeout(timeoutHandle);
}
}
}
async getPrompt(
name: string,
args: Record<string, string> | undefined,
redactionConfig?: RedactionOptions
): Promise<any> {
if (!this.client) {
throw new Error('Client not initialized');
}
const response = await this.client.getPrompt({
name,
arguments: args
});
// Apply redaction if enabled
if (redactionConfig?.enabled) {
const { matcher } = await this.redactionService.getService();
if (matcher) {
const auditor = redactionConfig.verboseAudit ?
new AuditLogger(this.name) :
null;
const originalResult = JSON.parse(JSON.stringify(response));
const redacted = this.redactionService.redactResponse(
response,
redactionConfig
);
if (auditor) {
auditor.logOperation(
redactionConfig,
'prompt_call',
originalResult,
redacted
);
}
return redacted;
}
}
return response;
}
async readResource(
uri: string,
redactionConfig?: RedactionOptions
): Promise<any> {
if (!this.client) {
throw new Error('Client not initialized');
}
const response = await this.client.readResource({
uri
});
// Apply redaction if enabled
if (redactionConfig?.enabled) {
const { matcher } = await this.redactionService.getService();
if (matcher) {
const auditor = redactionConfig.verboseAudit ?
new AuditLogger(this.name) :
null;
const originalResult = JSON.parse(JSON.stringify(response));
const redacted = this.redactionService.redactResponse(
response,
redactionConfig
);
if (auditor) {
auditor.logOperation(
redactionConfig,
'resource_call',
originalResult,
redacted
);
}
return redacted;
}
}
return response;
}
shouldFilterTool(toolName: string): boolean {
const toolFilter = this.config.options?.toolFilter;
if (!toolFilter || !toolFilter.list || toolFilter.list.length === 0) {
return false;
}
const filterSet = new Set(toolFilter.list);
const mode = (toolFilter.mode || 'block').toLowerCase() as ToolFilterMode;
switch (mode) {
case 'allow':
if (!filterSet.has(toolName)) {
this.logger.log(
[
'<',
this.name,
'> Ignoring tool ',
toolName,
' as it is not in allow list'
].join('')
);
return true;
}
return false;
case 'block':
if (filterSet.has(toolName)) {
this.logger.log(
[
'<',
this.name,
'> Ignoring tool ',
toolName,
' as it is in block list'
].join('')
);
return true;
}
return false;
default:
this.logger.warn(
[ '<', this.name, '> Unknown tool filter mode: ', mode ].join('')
);
return false;
}
}
async getServer(fresh = false): Promise<Server> {
Iif (!this.client) {
throw new Error('Client not initialized');
}
// Import schemas
const {
CallToolRequestSchema,
GetPromptRequestSchema,
ListToolsRequestSchema,
ListPromptsRequestSchema,
ListResourcesRequestSchema,
ReadResourceRequestSchema
} = await import('@modelcontextprotocol/sdk/types.js');
// Create a fresh server that proxies to this client
// Each server instance can only connect to one transport
const server = new Server(
{
name: this.name,
version: '1.0.0'
},
{
capabilities: {
tools: {},
prompts: {},
resources: {}
}
}
);
// Register tools from client lazily to avoid slow startup
server.setRequestHandler(ListToolsRequestSchema, async () => {
const tools = await this.listTools();
return { tools } as any;
});
// Single dispatching handler for tool calls
server.setRequestHandler(CallToolRequestSchema, async (request) => {
const requestedName = request.params.name;
const tools = await this.listTools();
const tool = tools.find((t) => t.name === requestedName);
Iif (!tool) {
throw new Error(`Tool ${ requestedName } not found`);
}
const stringArgs = (request.params.arguments || {}) as Record<string, string>;
return await this.callTool(
requestedName,
stringArgs,
this.config.options?.redaction
);
});
// Register prompts from client lazily
server.setRequestHandler(ListPromptsRequestSchema, async () => {
const prompts = await this.listPrompts();
return { prompts } as any;
});
// Single dispatching handler for prompt calls
server.setRequestHandler(GetPromptRequestSchema, async (request) => {
const requestedName = request.params.name;
const prompts = await this.listPrompts();
const prompt = prompts.find((p) => p.name === requestedName);
if (!prompt) {
throw new Error(`Prompt ${ requestedName } not found`);
}
const stringArgs = (request.params.arguments || {}) as Record<string, string>;
return await this.getPrompt(
requestedName,
stringArgs,
this.config.options?.redaction
);
});
// Register resources from client lazily
server.setRequestHandler(ListResourcesRequestSchema, async () => {
const resources = await this.listResources();
return { resources };
});
server.setRequestHandler(ReadResourceRequestSchema, async (request) => {
return await this.readResource(
request.params.uri,
this.config.options?.redaction
);
});
return server;
}
async close(): Promise<void> {
Eif (this.pingInterval) {
clearInterval(this.pingInterval);
this.pingInterval = null;
}
// Close the MCP client first to tear down any ongoing requests/timeouts
Eif (this.client) {
try {
await this.client.close();
} catch {}
this.client = null;
}
Eif (this.transport) {
await this.transport.close();
this.transport = null;
}
}
}
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