import { tools } from '../../src/tools.js';
/**
* Stateless JSON-RPC handler for serverless environments
*/
async function handleJsonRpcRequest(request) {
const { method, params, id } = request;
try {
let result;
if (method === 'initialize') {
result = {
protocolVersion: '2024-11-05',
capabilities: { tools: {} },
serverInfo: { name: 'wcag-mcp', version: '2.0.0' }
};
} else if (method === 'tools/list') {
result = {
tools: tools.map(tool => ({
name: tool.name,
description: tool.description,
inputSchema: tool.inputSchema
}))
};
} else if (method === 'tools/call') {
const tool = tools.find(t => t.name === params.name);
if (!tool) throw new Error(`Unknown tool: ${params.name}`);
result = await tool.handler(params.arguments || {});
} else if (method === 'notifications/initialized') {
return null; // Notifications don't get responses
} else if (method === 'ping') {
result = {};
} else {
throw new Error(`Unknown method: ${method}`);
}
return { jsonrpc: '2.0', id, result };
} catch (error) {
return { jsonrpc: '2.0', id, error: { code: -32603, message: error.message } };
}
}
/**
* Netlify Function handler
*/
export const handler = async (event, context) => {
const corsHeaders = {
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, OPTIONS',
'Access-Control-Allow-Headers': 'Content-Type, Accept, Mcp-Session-Id',
};
// CORS preflight
if (event.httpMethod === 'OPTIONS') {
return { statusCode: 204, headers: corsHeaders, body: '' };
}
// MCP JSON-RPC requests
if (event.httpMethod === 'POST') {
try {
const request = JSON.parse(event.body);
// Handle batch requests
if (Array.isArray(request)) {
const responses = [];
for (const req of request) {
const response = await handleJsonRpcRequest(req);
if (response !== null) responses.push(response);
}
return {
statusCode: 200,
headers: { ...corsHeaders, 'Content-Type': 'application/json' },
body: JSON.stringify(responses.length === 1 ? responses[0] : responses)
};
}
// Single request
const response = await handleJsonRpcRequest(request);
if (response === null) {
return { statusCode: 202, headers: corsHeaders, body: '' };
}
return {
statusCode: 200,
headers: { ...corsHeaders, 'Content-Type': 'application/json' },
body: JSON.stringify(response)
};
} catch (error) {
return {
statusCode: 400,
headers: { ...corsHeaders, 'Content-Type': 'application/json' },
body: JSON.stringify({
jsonrpc: '2.0', id: null,
error: { code: -32700, message: 'Parse error: ' + error.message }
})
};
}
}
// Health check (GET)
return {
statusCode: 200,
headers: { ...corsHeaders, 'Content-Type': 'application/json' },
body: JSON.stringify({
name: 'wcag-mcp',
version: '2.0.0',
status: 'healthy',
protocol: 'MCP JSON-RPC 2.0',
tools: tools.length
})
};
};
