commit 146c75b243b2673614bfbe3ecbd0f122a35b233a Author: SysAdmin Date: Sat Mar 7 16:24:05 2026 +0000 feat: initial Minecraft Bedrock AI Bridge MCP server MCP server that bridges Minecraft Bedrock Edition's WebSocket API to Claude Code CLI. Exposes 6 tools: minecraft_command, minecraft_chat, minecraft_build, minecraft_get_events, minecraft_get_status, minecraft_subscribe. Supports both SSE and Streamable HTTP MCP transports. Privacy-first: no disk persistence, no telemetry, memory-only event buffer. Co-Authored-By: Claude Opus 4.6 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..daf1dd0 --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +node_modules/ +.env +*.log +.DS_Store diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..97ff1ce --- /dev/null +++ b/Dockerfile @@ -0,0 +1,14 @@ +FROM node:22-alpine + +WORKDIR /app + +COPY package.json package-lock.json* ./ +RUN npm ci --production 2>/dev/null || npm install --production + +COPY src/ ./src/ + +EXPOSE 3001 3002 + +USER node + +CMD ["node", "src/index.js"] diff --git a/docker-compose.yml b/docker-compose.yml new file mode 100644 index 0000000..a9f3672 --- /dev/null +++ b/docker-compose.yml @@ -0,0 +1,12 @@ +services: + mc-ai-bridge: + build: . + container_name: mc-ai-bridge + ports: + - "3001:3001" # Minecraft WebSocket + - "3002:3002" # MCP SSE transport + environment: + - WS_PORT=3001 + - MCP_PORT=3002 + - NODE_ENV=production + restart: unless-stopped diff --git a/package-lock.json 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+ "description": "MCP server bridging Minecraft Bedrock Edition to Claude Code via WebSocket", + "type": "module", + "main": "src/index.js", + "scripts": { + "start": "node src/index.js", + "dev": "node --watch src/index.js" + }, + "dependencies": { + "@modelcontextprotocol/sdk": "^1.27.1", + "express": "^4.21.2", + "ws": "^8.18.0", + "zod": "^3.25.0" + }, + "engines": { + "node": ">=20.0.0" + }, + "private": true +} diff --git a/src/bedrock-ws.js b/src/bedrock-ws.js new file mode 100644 index 0000000..433e762 --- /dev/null +++ b/src/bedrock-ws.js @@ -0,0 +1,224 @@ +import { WebSocketServer } from 'ws'; +import { createSubscribeMessage, createCommandMessage, sanitize, log, logError } from './utils.js'; +import { EventStore } from './event-store.js'; +import { CommandQueue } from './command-queue.js'; + +const TAG = 'BedrockWS'; + +/** + * WebSocket server that accepts a connection from Minecraft Bedrock Edition. + * Only one Minecraft client is supported at a time. + */ +export class BedrockWebSocket { + /** + * @param {object} opts + * @param {number} opts.port - WebSocket listen port (default 3001) + */ + constructor(opts = {}) { + this.port = opts.port ?? 3001; + this.events = new EventStore(100); + this.commandQueue = new CommandQueue(); + + /** @type {import('ws').WebSocket | null} */ + this._ws = null; + this._wss = null; + this._connectedAt = null; + this._playerName = null; + this._subscriptions = new Set(); + } + + /** Start the WebSocket server */ + start() { + this._wss = new WebSocketServer({ port: this.port }); + + this._wss.on('listening', () => { + log(TAG, `WebSocket server listening on port ${this.port}`); + log(TAG, `In Minecraft, type: /connect ws://:${this.port}`); + }); + + this._wss.on('connection', (ws) => { + // Only allow one connection at a time + if (this._ws) { + log(TAG, 'Rejecting new connection - already have an active client'); + ws.close(1000, 'Only one Minecraft client supported'); + return; + } + + this._ws = ws; + this._connectedAt = new Date(); + log(TAG, 'Minecraft client connected!'); + + // Wire up command queue to send over this socket + this.commandQueue.setSendFunction((id, message) => { + if (this._ws && this._ws.readyState === 1) { + this._ws.send(message); + } else { + throw new Error('WebSocket not connected'); + } + }); + + // Auto-subscribe to key events + this._autoSubscribe(); + + ws.on('message', (raw) => { + try { + const data = JSON.parse(raw.toString()); + this._handleMessage(data); + } catch (err) { + logError(TAG, 'Failed to parse message:', err.message); + } + }); + + ws.on('close', (code, reason) => { + log(TAG, `Minecraft disconnected (code: ${code}, reason: ${reason || 'none'})`); + this._ws = null; + this._connectedAt = null; + this._playerName = null; + this._subscriptions.clear(); + this.commandQueue.setSendFunction(null); + }); + + ws.on('error', (err) => { + logError(TAG, 'WebSocket error:', err.message); + }); + }); + + this._wss.on('error', (err) => { + logError(TAG, 'Server error:', err.message); + }); + } + + /** Subscribe to default event types */ + _autoSubscribe() { + const defaultEvents = ['PlayerMessage']; + for (const eventName of defaultEvents) { + this.subscribe(eventName); + } + } + + /** + * Subscribe to a Bedrock event type. + * @param {string} eventName + */ + subscribe(eventName) { + if (!this._ws || this._ws.readyState !== 1) { + log(TAG, `Cannot subscribe to ${eventName} - not connected`); + return false; + } + + if (this._subscriptions.has(eventName)) { + log(TAG, `Already subscribed to ${eventName}`); + return true; + } + + this._ws.send(createSubscribeMessage(eventName)); + this._subscriptions.add(eventName); + log(TAG, `Subscribed to ${eventName}`); + return true; + } + + /** + * Handle an incoming WebSocket message from Bedrock. + * @param {object} data - Parsed JSON message + */ + _handleMessage(data) { + const purpose = data?.header?.messagePurpose; + + if (purpose === 'commandResponse') { + // Response to a command we sent + const requestId = data.header.requestId; + this.commandQueue.handleResponse(requestId, data.body); + return; + } + + if (purpose === 'event') { + const eventName = data.header.eventName; + const body = data.body || {}; + + // Filter bot's own messages to prevent echo loops + if (eventName === 'PlayerMessage') { + const sender = body.sender || ''; + const message = sanitize(body.message || ''); + const type = body.type || 'chat'; + + // Skip messages from external sources (commands, say, tell from server) + if (type !== 'chat' || sender === 'External' || sender === '') { + return; + } + + // Track player name from first chat message + if (!this._playerName && sender) { + this._playerName = sender; + log(TAG, `Player identified: ${this._playerName}`); + } + + this.events.push(eventName, { + sender, + message, + type, + }); + + log(TAG, `[Chat] <${sender}> ${message}`); + return; + } + + // Store all other events + this.events.push(eventName, body); + } + } + + /** + * Send a command to Minecraft. + * @param {string} commandLine - e.g. "give @p diamond 64" + * @returns {Promise} Command response + */ + async sendCommand(commandLine) { + if (!this.isConnected()) { + throw new Error('Minecraft is not connected'); + } + const { id, message } = createCommandMessage(commandLine); + return this.commandQueue.enqueue(id, message); + } + + /** + * Send a batch of commands (for building). + * @param {string[]} commandLines + * @returns {Promise} Batch result + */ + async sendBatch(commandLines) { + if (!this.isConnected()) { + throw new Error('Minecraft is not connected'); + } + const commands = commandLines.map((line) => createCommandMessage(line)); + return this.commandQueue.enqueueBatch(commands); + } + + /** @returns {boolean} Whether a Minecraft client is connected */ + isConnected() { + return this._ws !== null && this._ws.readyState === 1; + } + + /** @returns {object} Status information */ + getStatus() { + return { + connected: this.isConnected(), + playerName: this._playerName, + connectedAt: this._connectedAt?.toISOString() || null, + subscriptions: [...this._subscriptions], + eventCount: this.events.size, + ...this.commandQueue.getStatus(), + }; + } + + /** Shut down the server */ + stop() { + this.commandQueue.destroy(); + if (this._ws) { + this._ws.close(); + } + if (this._wss) { + this._wss.close(); + } + log(TAG, 'Server stopped'); + } +} diff --git a/src/command-queue.js b/src/command-queue.js new file mode 100644 index 0000000..b87a6fa --- /dev/null +++ b/src/command-queue.js @@ -0,0 +1,181 @@ +import { log, logError } from './utils.js'; + +const TAG = 'CommandQueue'; + +/** + * Rate-limited command dispatcher for Minecraft Bedrock. + * Bedrock has a hard limit of ~100 in-flight commands. + * We cap at 80 and throttle at 50ms between commands. + */ +export class CommandQueue { + /** + * @param {object} opts + * @param {number} opts.maxInFlight - Max concurrent commands (default 80) + * @param {number} opts.throttleMs - Delay between commands in ms (default 50) + * @param {number} opts.batchSize - Commands per batch for build mode (default 20) + * @param {number} opts.batchDelayMs - Delay between batches in ms (default 200) + */ + constructor(opts = {}) { + this.maxInFlight = opts.maxInFlight ?? 80; + this.throttleMs = opts.throttleMs ?? 50; + this.batchSize = opts.batchSize ?? 20; + this.batchDelayMs = opts.batchDelayMs ?? 200; + + /** @type {Map} */ + this._pending = new Map(); + this._queue = []; + this._processing = false; + this._sendFn = null; + this._totalSent = 0; + this._totalCompleted = 0; + } + + /** + * Set the function used to actually send a command over WebSocket. + * @param {(id: string, message: string) => void} fn + */ + setSendFunction(fn) { + this._sendFn = fn; + } + + /** + * Called when a command response comes back from Bedrock. + * @param {string} requestId + * @param {object} response + */ + handleResponse(requestId, response) { + const entry = this._pending.get(requestId); + if (entry) { + clearTimeout(entry.timer); + this._pending.delete(requestId); + this._totalCompleted++; + entry.resolve(response); + } + } + + /** + * Enqueue a single command for dispatch. + * @param {string} id - Request UUID + * @param {string} message - Serialized WS message + * @param {number} timeoutMs - Per-command timeout (default 10s) + * @returns {Promise} Resolves with Bedrock response + */ + enqueue(id, message, timeoutMs = 10000) { + return new Promise((resolve, reject) => { + this._queue.push({ id, message, resolve, reject, timeoutMs }); + this._processQueue(); + }); + } + + /** + * Enqueue a batch of commands (for building). + * Sends in groups of batchSize with batchDelayMs between groups. + * @param {Array<{id: string, message: string}>} commands + * @returns {Promise<{total: number, succeeded: number, failed: number, results: Array}>} + */ + async enqueueBatch(commands) { + const results = []; + let succeeded = 0; + let failed = 0; + + for (let i = 0; i < commands.length; i += this.batchSize) { + const batch = commands.slice(i, i + this.batchSize); + + const batchResults = await Promise.allSettled( + batch.map((cmd) => this.enqueue(cmd.id, cmd.message)) + ); + + for (const result of batchResults) { + if (result.status === 'fulfilled') { + succeeded++; + results.push(result.value); + } else { + failed++; + results.push({ error: result.reason?.message || 'unknown error' }); + } + } + + // Delay between batches (except after the last one) + if (i + this.batchSize < commands.length) { + await this._delay(this.batchDelayMs); + } + } + + return { total: commands.length, succeeded, failed, results }; + } + + /** Process queued commands respecting rate limits */ + async _processQueue() { + if (this._processing) return; + this._processing = true; + + while (this._queue.length > 0) { + // Wait if at capacity + if (this._pending.size >= this.maxInFlight) { + await this._delay(this.throttleMs); + continue; + } + + const item = this._queue.shift(); + if (!item) break; + + if (!this._sendFn) { + item.reject(new Error('No WebSocket connection')); + continue; + } + + // Set up timeout + const timer = setTimeout(() => { + const entry = this._pending.get(item.id); + if (entry) { + this._pending.delete(item.id); + entry.reject(new Error('Command timed out')); + } + }, item.timeoutMs); + + this._pending.set(item.id, { + resolve: item.resolve, + reject: item.reject, + timer, + }); + + try { + this._sendFn(item.id, item.message); + this._totalSent++; + } catch (err) { + clearTimeout(timer); + this._pending.delete(item.id); + item.reject(err); + } + + // Throttle between sends + await this._delay(this.throttleMs); + } + + this._processing = false; + } + + /** @returns {{queueSize: number, inFlight: number, totalSent: number, totalCompleted: number}} */ + getStatus() { + return { + queueSize: this._queue.length, + inFlight: this._pending.size, + totalSent: this._totalSent, + totalCompleted: this._totalCompleted, + }; + } + + _delay(ms) { + return new Promise((r) => setTimeout(r, ms)); + } + + /** Clean up all pending timeouts */ + destroy() { + for (const entry of this._pending.values()) { + clearTimeout(entry.timer); + entry.reject(new Error('Queue destroyed')); + } + this._pending.clear(); + this._queue = []; + } +} diff --git a/src/event-store.js b/src/event-store.js new file mode 100644 index 0000000..831faa7 --- /dev/null +++ b/src/event-store.js @@ -0,0 +1,61 @@ +/** + * In-memory ring buffer for Minecraft game events. + * Privacy-first: no disk persistence, lost on restart. + */ +export class EventStore { + /** @param {number} capacity - Maximum events to retain */ + constructor(capacity = 100) { + this._capacity = capacity; + /** @type {Array<{type: string, timestamp: string, data: object}>} */ + this._events = []; + } + + /** + * Push a new event into the ring buffer. + * @param {string} type - Event type (e.g. "PlayerMessage") + * @param {object} data - Event payload + */ + push(type, data) { + this._events.push({ + type, + timestamp: new Date().toISOString(), + data, + }); + + // Trim to capacity + if (this._events.length > this._capacity) { + this._events = this._events.slice(-this._capacity); + } + } + + /** + * Get the most recent events. + * @param {number} count - Number of events to return + * @returns {Array} + */ + getRecent(count = 20) { + return this._events.slice(-count); + } + + /** + * Get recent events filtered by type. + * @param {string} type - Event type to filter by + * @param {number} count - Max number to return + * @returns {Array} + */ + getByType(type, count = 20) { + return this._events + .filter((e) => e.type === type) + .slice(-count); + } + + /** @returns {number} Total events currently stored */ + get size() { + return this._events.length; + } + + /** Clear all events */ + clear() { + this._events = []; + } +} diff --git a/src/index.js b/src/index.js new file mode 100644 index 0000000..7ede939 --- /dev/null +++ b/src/index.js @@ -0,0 +1,36 @@ +import { BedrockWebSocket } from './bedrock-ws.js'; +import { startMcpServer } from './mcp-server.js'; +import { log } from './utils.js'; + +const TAG = 'Main'; + +const WS_PORT = parseInt(process.env.WS_PORT || '3001', 10); +const MCP_PORT = parseInt(process.env.MCP_PORT || '3002', 10); + +log(TAG, 'Minecraft Bedrock AI Bridge starting...'); + +// Start the Bedrock WebSocket server +const bedrock = new BedrockWebSocket({ port: WS_PORT }); +bedrock.start(); + +// Start the MCP server (Streamable HTTP transport) +startMcpServer(bedrock, MCP_PORT); + +log(TAG, ''); +log(TAG, '=== READY ==='); +log(TAG, `Minecraft WebSocket : ws://0.0.0.0:${WS_PORT}`); +log(TAG, `MCP HTTP endpoint : http://0.0.0.0:${MCP_PORT}/mcp`); +log(TAG, `Health check : http://0.0.0.0:${MCP_PORT}/health`); +log(TAG, ''); +log(TAG, 'In Minecraft, type: /connect ws://:' + WS_PORT); +log(TAG, ''); + +// Graceful shutdown +function shutdown(signal) { + log(TAG, `${signal} received, shutting down...`); + bedrock.stop(); + process.exit(0); +} + +process.on('SIGINT', () => shutdown('SIGINT')); +process.on('SIGTERM', () => shutdown('SIGTERM')); diff --git a/src/mcp-server.js b/src/mcp-server.js new file mode 100644 index 0000000..06dca9e --- /dev/null +++ b/src/mcp-server.js @@ -0,0 +1,409 @@ +import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'; +import { StreamableHTTPServerTransport } from '@modelcontextprotocol/sdk/server/streamableHttp.js'; +import { SSEServerTransport } from '@modelcontextprotocol/sdk/server/sse.js'; +import { randomUUID } from 'node:crypto'; +import express from 'express'; +import { z } from 'zod'; +import { log, logError } from './utils.js'; + +const TAG = 'MCP'; + +// Available Bedrock event types for subscription +const BEDROCK_EVENTS = [ + 'PlayerMessage', + 'BlockChanged', + 'PlayerTransform', + 'ItemUsed', + 'ItemAcquired', + 'ItemCrafted', + 'MobKilled', + 'MobInteracted', + 'PlayerTravelled', + 'PlayerDied', + 'BossKilled', +]; + +/** + * Create and configure the MCP server with all Minecraft tools. + * @param {import('./bedrock-ws.js').BedrockWebSocket} bedrock - The Bedrock WS bridge + * @param {number} port - HTTP port for MCP transport (default 3002) + */ +export function startMcpServer(bedrock, port = 3002) { + const app = express(); + app.use(express.json()); + + // Track active transports by session + const transports = {}; + + // Create a fresh McpServer for each session, wired to the same bedrock instance + function createServer() { + const server = new McpServer( + { + name: 'minecraft-bridge', + version: '1.0.0', + }, + { + capabilities: { logging: {} }, + } + ); + + // ── Tool: minecraft_command ────────────────────────────────────────── + server.registerTool( + 'minecraft_command', + { + title: 'Minecraft Command', + description: + 'Execute any slash command in Minecraft Bedrock. Examples: "give @p diamond 64", "tp @p 100 64 200", "time set night", "weather thunder". Do NOT include the leading slash.', + inputSchema: z.object({ + command: z + .string() + .describe( + 'The command to execute (without leading slash). E.g. "give @p diamond 64"' + ), + }), + }, + async ({ command }) => { + try { + const response = await bedrock.sendCommand(command); + const statusMessage = response?.statusMessage || 'Command executed'; + const statusCode = response?.statusCode ?? -1; + return { + content: [ + { + type: 'text', + text: `[${statusCode === 0 ? 'OK' : 'ERROR'}] ${statusMessage}`, + }, + ], + }; + } catch (err) { + return { + content: [{ type: 'text', text: `Error: ${err.message}` }], + isError: true, + }; + } + } + ); + + // ── Tool: minecraft_chat ──────────────────────────────────────────── + server.registerTool( + 'minecraft_chat', + { + title: 'Minecraft Chat', + description: + 'Send a chat message visible in Minecraft. Uses /say for broadcast or /tell for a specific player.', + inputSchema: z.object({ + message: z.string().describe('The message to send'), + player: z + .string() + .optional() + .describe( + 'Target player name for /tell. Omit to broadcast with /say.' + ), + }), + }, + async ({ message, player }) => { + try { + const cmd = player + ? `tell ${player} ${message}` + : `say ${message}`; + const response = await bedrock.sendCommand(cmd); + return { + content: [ + { + type: 'text', + text: `Message sent${player ? ` to ${player}` : ''}: "${message}"`, + }, + ], + }; + } catch (err) { + return { + content: [{ type: 'text', text: `Error: ${err.message}` }], + isError: true, + }; + } + } + ); + + // ── Tool: minecraft_build ─────────────────────────────────────────── + server.registerTool( + 'minecraft_build', + { + title: 'Minecraft Build', + description: + 'Execute a batch of build commands (setblock, fill, clone) with rate limiting. Max 200 commands per call. Commands should NOT have a leading slash.', + inputSchema: z.object({ + commands: z + .array(z.string()) + .max(200) + .describe( + 'Array of build commands. E.g. ["setblock 10 64 10 stone", "fill 10 64 10 20 64 20 glass"]' + ), + }), + }, + async ({ commands }) => { + // Validate: only allow build commands + const allowed = ['setblock', 'fill', 'clone', 'structure']; + const invalid = commands.filter((cmd) => { + const base = cmd.replace(/^\//, '').split(' ')[0].toLowerCase(); + return !allowed.includes(base); + }); + + if (invalid.length > 0) { + return { + content: [ + { + type: 'text', + text: `Error: Only setblock/fill/clone/structure commands allowed. Invalid: ${invalid.slice(0, 3).join(', ')}`, + }, + ], + isError: true, + }; + } + + try { + const result = await bedrock.sendBatch(commands); + return { + content: [ + { + type: 'text', + text: `Build complete: ${result.succeeded}/${result.total} commands succeeded, ${result.failed} failed`, + }, + ], + }; + } catch (err) { + return { + content: [{ type: 'text', text: `Error: ${err.message}` }], + isError: true, + }; + } + } + ); + + // ── Tool: minecraft_get_events ────────────────────────────────────── + server.registerTool( + 'minecraft_get_events', + { + title: 'Minecraft Get Events', + description: + 'Get recent game events (chat messages, block changes, etc.) from the in-memory event buffer.', + inputSchema: z.object({ + count: z + .number() + .int() + .min(1) + .max(100) + .optional() + .describe('Number of events to return (default 20, max 100)'), + type: z + .string() + .optional() + .describe( + 'Filter by event type. E.g. "PlayerMessage", "BlockChanged"' + ), + }), + }, + async ({ count, type }) => { + const n = count ?? 20; + const events = type + ? bedrock.events.getByType(type, n) + : bedrock.events.getRecent(n); + + if (events.length === 0) { + return { + content: [ + { + type: 'text', + text: 'No events recorded yet. Make sure Minecraft is connected and events are subscribed.', + }, + ], + }; + } + + const formatted = events + .map( + (e) => + `[${e.timestamp}] ${e.type}: ${JSON.stringify(e.data)}` + ) + .join('\n'); + + return { + content: [ + { + type: 'text', + text: `${events.length} event(s):\n${formatted}`, + }, + ], + }; + } + ); + + // ── Tool: minecraft_get_status ────────────────────────────────────── + server.registerTool( + 'minecraft_get_status', + { + title: 'Minecraft Status', + description: + 'Check if Minecraft is connected and get status info (player name, uptime, queue, event count).', + inputSchema: z.object({}), + }, + async () => { + const status = bedrock.getStatus(); + const lines = [ + `Connected: ${status.connected ? 'YES' : 'NO'}`, + `Player: ${status.playerName || 'unknown'}`, + `Connected since: ${status.connectedAt || 'N/A'}`, + `Subscriptions: ${status.subscriptions.join(', ') || 'none'}`, + `Events stored: ${status.eventCount}`, + `Commands sent: ${status.totalSent}`, + `Commands completed: ${status.totalCompleted}`, + `Queue size: ${status.queueSize}`, + `In-flight: ${status.inFlight}`, + ]; + + return { + content: [{ type: 'text', text: lines.join('\n') }], + }; + } + ); + + // ── Tool: minecraft_subscribe ─────────────────────────────────────── + server.registerTool( + 'minecraft_subscribe', + { + title: 'Minecraft Subscribe', + description: `Subscribe to additional Bedrock event types. Available: ${BEDROCK_EVENTS.join(', ')}`, + inputSchema: z.object({ + event: z + .string() + .describe( + `Event type to subscribe to. One of: ${BEDROCK_EVENTS.join(', ')}` + ), + }), + }, + async ({ event }) => { + if (!BEDROCK_EVENTS.includes(event)) { + return { + content: [ + { + type: 'text', + text: `Unknown event "${event}". Available: ${BEDROCK_EVENTS.join(', ')}`, + }, + ], + isError: true, + }; + } + + const ok = bedrock.subscribe(event); + if (ok) { + return { + content: [ + { type: 'text', text: `Subscribed to ${event} events` }, + ], + }; + } else { + return { + content: [ + { + type: 'text', + text: `Failed to subscribe to ${event}. Is Minecraft connected?`, + }, + ], + isError: true, + }; + } + } + ); + + return server; + } + + // ── SSE Transport endpoint ────────────────────────────────────────── + // SSE is the most widely supported MCP transport for Claude Code + app.get('/sse', async (req, res) => { + log(TAG, 'SSE client connected'); + const transport = new SSEServerTransport('/messages', res); + const sessionId = transport.sessionId; + transports[sessionId] = transport; + + transport.onclose = () => { + delete transports[sessionId]; + log(TAG, `SSE session closed: ${sessionId}`); + }; + + const server = createServer(); + await server.connect(transport); + log(TAG, `SSE session started: ${sessionId}`); + }); + + app.post('/messages', async (req, res) => { + const sessionId = req.query.sessionId; + const transport = transports[sessionId]; + if (transport) { + await transport.handlePostMessage(req, res, req.body); + } else { + res.status(400).send('Invalid or missing session'); + } + }); + + // ── Streamable HTTP Transport (modern alternative) ───────────────── + app.post('/mcp', async (req, res) => { + const sessionId = req.headers['mcp-session-id']; + + if (sessionId && transports[sessionId]) { + await transports[sessionId].handleRequest(req, res, req.body); + return; + } + + // New session + const transport = new StreamableHTTPServerTransport({ + sessionIdGenerator: () => randomUUID(), + onsessioninitialized: (id) => { + transports[id] = transport; + log(TAG, `Streamable HTTP session created: ${id}`); + }, + }); + + transport.onclose = () => { + if (transport.sessionId) { + delete transports[transport.sessionId]; + log(TAG, `Streamable HTTP session closed: ${transport.sessionId}`); + } + }; + + const server = createServer(); + await server.connect(transport); + await transport.handleRequest(req, res, req.body); + }); + + app.get('/mcp', async (req, res) => { + const sessionId = req.headers['mcp-session-id']; + if (sessionId && transports[sessionId]) { + await transports[sessionId].handleRequest(req, res); + } else { + res.status(400).send('Invalid or missing session'); + } + }); + + app.delete('/mcp', async (req, res) => { + const sessionId = req.headers['mcp-session-id']; + if (sessionId && transports[sessionId]) { + await transports[sessionId].handleRequest(req, res); + } else { + res.status(400).send('Invalid or missing session'); + } + }); + + // Health check endpoint + app.get('/health', (_req, res) => { + res.json({ + status: 'ok', + minecraft: bedrock.isConnected(), + uptime: process.uptime(), + }); + }); + + app.listen(port, '0.0.0.0', () => { + log(TAG, `MCP SSE endpoint : http://0.0.0.0:${port}/sse`); + log(TAG, `MCP HTTP endpoint : http://0.0.0.0:${port}/mcp`); + }); +} diff --git a/src/utils.js b/src/utils.js new file mode 100644 index 0000000..93f6581 --- /dev/null +++ b/src/utils.js @@ -0,0 +1,80 @@ +import { randomUUID } from 'node:crypto'; + +/** + * Create a Bedrock WebSocket subscribe message envelope. + * @param {string} eventName - e.g. "PlayerMessage", "BlockChanged" + * @returns {string} JSON string ready to send over WS + */ +export function createSubscribeMessage(eventName) { + return JSON.stringify({ + header: { + version: 1, + requestId: randomUUID(), + messageType: 'commandRequest', + messagePurpose: 'subscribe', + }, + body: { + eventName, + }, + }); +} + +/** + * Create a Bedrock WebSocket command message envelope. + * @param {string} commandLine - e.g. "give @p diamond 64" (no leading slash) + * @returns {{ id: string, message: string }} request ID and JSON string + */ +export function createCommandMessage(commandLine) { + // Strip leading slash if present + const cmd = commandLine.startsWith('/') ? commandLine.slice(1) : commandLine; + const requestId = randomUUID(); + + const message = JSON.stringify({ + header: { + version: 1, + requestId, + messageType: 'commandRequest', + messagePurpose: 'commandRequest', + }, + body: { + version: 1, + commandLine: cmd, + origin: { + type: 'player', + }, + }, + }); + + return { id: requestId, message }; +} + +/** + * Strip Minecraft formatting codes (section sign + character). + * @param {string} text + * @returns {string} + */ +export function sanitize(text) { + if (!text) return ''; + // Remove section sign formatting codes like §a, §l, §r etc. + return text.replace(/\u00A7[0-9a-fk-or]/gi, ''); +} + +/** + * Timestamped log helper. + * @param {string} tag - Module tag + * @param {...any} args - Log arguments + */ +export function log(tag, ...args) { + const ts = new Date().toISOString(); + console.log(`[${ts}] [${tag}]`, ...args); +} + +/** + * Timestamped error log helper. + * @param {string} tag - Module tag + * @param {...any} args - Log arguments + */ +export function logError(tag, ...args) { + const ts = new Date().toISOString(); + console.error(`[${ts}] [${tag}]`, ...args); +}