import { randomUUID } from 'node:crypto'; import { createServer, type IncomingMessage, type ServerResponse } from 'node:http'; import { buildAgentCard, resolveTemplateAgentConfig, TEMPLATE_AGENT_ID, TEMPLATE_AGENT_NAME } from './metadata.js'; import { executeTemplateAgentAction, type TemplateAgentAction } from './runtime.js'; type RpcRequest = { jsonrpc?: string; id?: string | number | null; method?: string; params?: Record }; export function createTemplateAgentHttpServer() { const config = resolveTemplateAgentConfig(); const server = createServer((request, response) => void handleRequest(request, response, config.publicBaseUrl)); return { server, async start() { await new Promise((resolve, reject) => { server.once('error', reject); server.listen(config.port, config.host, () => resolve()); }); }, async stop() { await new Promise((resolve, reject) => server.close((error) => (error ? reject(error) : resolve()))); }, }; } async function handleRequest(request: IncomingMessage, response: ServerResponse, baseUrl: string) { if (request.method === 'GET' && request.url === '/health') return sendJson(response, 200, { ok: true, agent: TEMPLATE_AGENT_ID }); if (request.method === 'GET' && request.url === '/') return sendHtml(response, 200, `

${TEMPLATE_AGENT_NAME}

`); if (request.method === 'GET' && (request.url === '/.well-known/agent-card.json' || request.url === '/.well-known/agent.json')) { return sendJson(response, 200, buildAgentCard(baseUrl)); } if (request.method === 'POST' && request.url === '/a2a/v1') { const rpc = ((await readJson(request)) || {}) as RpcRequest; if (rpc.method === 'agent/getCard') return sendJson(response, 200, { jsonrpc: '2.0', id: rpc.id ?? null, result: buildAgentCard(baseUrl) }); if (rpc.method === 'message/send') { const action = parseAction((rpc.params?.message as { parts?: Array<{ text?: string }> } | undefined)?.parts?.map((part) => part.text || '').join(' ').trim() || ''); const result = await executeTemplateAgentAction(action); return sendJson(response, 200, { jsonrpc: '2.0', id: rpc.id ?? null, result: { id: randomUUID(), kind: 'task', status: { state: 'completed', timestamp: new Date().toISOString(), message: { role: 'agent', parts: [{ type: 'text', text: 'done' }] } }, artifacts: [{ id: randomUUID(), name: action.action, description: action.action, parts: [{ type: 'data', data: result }] }], metadata: { action: action.action }, }, }); } } sendJson(response, 404, { error: 'not_found' }); } function parseAction(text: string): TemplateAgentAction { const value = text.toLowerCase(); if (value === 'sin.code.datascience health') return { action: 'sin.code.datascience.health' }; if (value === 'sin.code.datascience onboarding status') return { action: 'sin.code.datascience.onboarding.status' }; return { action: 'agent.help' }; } async function readJson(request: IncomingMessage) { const chunks: Buffer[] = []; for await (const chunk of request) chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk)); const raw = Buffer.concat(chunks).toString('utf8').trim(); return raw ? JSON.parse(raw) : null; } function sendJson(response: ServerResponse, statusCode: number, payload: unknown) { response.statusCode = statusCode; response.setHeader('content-type', 'application/json; charset=utf-8'); response.end(JSON.stringify(payload, null, 2)); } function sendHtml(response: ServerResponse, statusCode: number, payload: string) { response.statusCode = statusCode; response.setHeader('content-type', 'text/html; charset=utf-8'); response.end(payload); }