/*
Copyright 2025 Docker Hub MCP Server authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import express, { Express, Request, Response } from 'express';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js';
import { McpServer as Server } from '@modelcontextprotocol/sdk/server/mcp.js';
import {
JSONRPC_VERSION,
METHOD_NOT_FOUND,
INTERNAL_ERROR,
} from '@modelcontextprotocol/specification/schema/2025-06-18/schema';
import { ScoutAPI } from './scout';
import { Asset } from './asset';
import { Repos } from './repos';
import { Accounts } from './accounts';
import { Search } from './search';
import { logger } from './logger';
const STDIO_OPTION = 'stdio';
const STREAMABLE_HTTP_OPTION = 'http';
export class HubMCPServer {
private readonly server: Server;
private readonly assets: Asset[];
constructor(username?: string, patToken?: string) {
this.server = new Server(
{
name: 'dockerhub-mcp-server',
version: '1.0.0',
},
{
capabilities: {
tools: {},
},
}
);
this.assets = [
new Repos(this.server, {
name: 'repos',
host: 'https://hub.docker.com/v2',
auth: {
type: 'pat',
token: patToken,
username: username,
},
}),
new Accounts(this.server, {
name: 'accounts',
host: 'https://hub.docker.com/v2',
auth: {
type: 'pat',
token: patToken,
username: username,
},
}),
new Search(this.server, {
name: 'search',
host: 'https://hub.docker.com/api/search',
}),
new ScoutAPI(this.server, {
name: 'scout',
host: 'https://api.scout.docker.com',
auth: {
type: 'pat',
token: patToken,
username: username,
},
}),
];
for (const asset of this.assets) {
asset.RegisterTools();
}
}
async run(port: number, transportType: string): Promise<void> {
let transport = null;
switch (transportType) {
case STDIO_OPTION:
transport = new StdioServerTransport();
await this.server.connect(transport);
logger.info('mcp server listening over stdio');
break;
case STREAMABLE_HTTP_OPTION: {
const app = express();
app.use(express.json());
this.registerRoutes(app);
app.listen(port, () => {
logger.info(`mcp server listening on port ${port}`);
});
break;
}
}
}
private registerRoutes(app: Express) {
app.post('/mcp', async (req: Request, res: Response) => {
const sanitizedBody = JSON.stringify(req.body).replace(/\n|\r/g, '');
logger.info(`received mcp request: ${sanitizedBody}`);
try {
const transport = new StreamableHTTPServerTransport({
sessionIdGenerator: undefined,
enableJsonResponse: true,
});
await this.server.connect(transport);
await transport.handleRequest(req, res, req.body);
} catch (error) {
logger.info(`error handling mcp request: ${error}`);
if (!res.headersSent) {
res.status(500).json({
jsonrpc: JSONRPC_VERSION,
error: {
code: INTERNAL_ERROR,
message: 'Internal server error',
},
id: null,
});
}
}
});
app.get('/mcp', async (req: Request, res: Response) => {
logger.info('received get mcp request');
res.writeHead(405).end(
JSON.stringify({
jsonrpc: JSONRPC_VERSION,
error: {
code: METHOD_NOT_FOUND,
message: 'Method not allowed.',
},
id: null,
})
);
});
app.delete('/mcp', async (req: Request, res: Response) => {
logger.info('received delete mcp request');
res.writeHead(405).end(
JSON.stringify({
jsonrpc: JSONRPC_VERSION,
error: {
code: METHOD_NOT_FOUND,
message: 'Method not allowed.',
},
id: null,
})
);
});
}
public GetAssets(): Asset[] {
return this.assets;
}
}
