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"devDependencies": { "@types/bun": "latest", + "@types/express": "^5.0.0", "@types/node": "^22.0.0", "conventional-changelog-cli": "^5.0.0" }, @@ -40,6 +41,7 @@ }, "dependencies": { "@modelcontextprotocol/sdk": "^1.22.0", + "express": "^4.21.2", "viem": "^2.39.3", "zod": "^3.24.3" }, diff --git a/src/core/services/wallet.ts b/src/core/services/wallet.ts index 061fa66..799bc10 100644 --- a/src/core/services/wallet.ts +++ b/src/core/services/wallet.ts @@ -1,18 +1,26 @@ import { type Address, type Hex } from 'viem'; -import { privateKeyToAccount, mnemonicToAccount } from 'viem/accounts'; +import { privateKeyToAccount, mnemonicToAccount, type HDAccount, type PrivateKeyAccount } from 'viem/accounts'; /** * Get the configured account from environment (private key or mnemonic) - * + * * Configuration options: * - EVM_PRIVATE_KEY: Hex private key (with or without 0x prefix) * - EVM_MNEMONIC: BIP-39 mnemonic phrase (12 or 24 words) * - EVM_ACCOUNT_INDEX: Optional account index for HD wallet derivation (default: 0) */ -export const getConfiguredAccount = () => { +export const getConfiguredAccount = (): HDAccount | PrivateKeyAccount => { const privateKey = process.env.EVM_PRIVATE_KEY; const mnemonic = process.env.EVM_MNEMONIC; - const accountIndex = parseInt(process.env.EVM_ACCOUNT_INDEX || '0'); + const accountIndexStr = process.env.EVM_ACCOUNT_INDEX || '0'; + const accountIndex = parseInt(accountIndexStr, 10); + + // Validate account index + if (isNaN(accountIndex) || accountIndex < 0 || !Number.isInteger(accountIndex)) { + throw new Error( + `Invalid EVM_ACCOUNT_INDEX: "${accountIndexStr}". Must be a non-negative integer.` + ); + } if (privateKey) { // Use private key if provided @@ -34,16 +42,33 @@ export const getConfiguredAccount = () => { /** * Helper to get the configured private key (for services that need it) + * + * For HDAccount (from mnemonic): extracts private key from HD key + * For PrivateKeyAccount: returns the original private key */ export const getConfiguredPrivateKey = (): Hex => { const account = getConfiguredAccount(); - // For mnemonic-based accounts, we need to extract the private key - // Viem accounts have a privateKey property but it's not always in the type definition - const accountWithKey = account as any; - if (!accountWithKey.privateKey) { - throw new Error("Unable to extract private key from account"); + + // Check if this is an HDAccount (has getHdKey method) + if ('getHdKey' in account && typeof account.getHdKey === 'function') { + const hdKey = account.getHdKey(); + if (!hdKey.privateKey) { + throw new Error("Unable to derive private key from HD account - no private key in HD key"); + } + // Convert Uint8Array to hex string + const privateKeyHex = Buffer.from(hdKey.privateKey).toString('hex'); + return `0x${privateKeyHex}` as Hex; + } + + // For PrivateKeyAccount, re-read from environment since we created from it + if ('source' in account && account.source === 'privateKey') { + const privateKey = process.env.EVM_PRIVATE_KEY; + if (privateKey) { + return (privateKey.startsWith('0x') ? privateKey : `0x${privateKey}`) as Hex; + } } - return accountWithKey.privateKey; + + throw new Error("Unable to extract private key from account"); }; /** diff --git a/src/server/http-server.ts b/src/server/http-server.ts index 5774fc9..cb20194 100644 --- a/src/server/http-server.ts +++ b/src/server/http-server.ts @@ -12,10 +12,30 @@ console.error(`Configured to listen on ${HOST}:${PORT}`); // Setup Express const app = express(); -app.use(express.json()); +app.use(express.json({ limit: '10mb' })); // Prevent DoS attacks with huge payloads -// Track active transports by session ID +// Track active transports by session ID with cleanup const transports = new Map(); +const sessionTimestamps = new Map(); +const SESSION_TIMEOUT_MS = 30 * 60 * 1000; // 30 minutes + +// Cleanup stale sessions periodically +setInterval(() => { + const now = Date.now(); + for (const [sessionId, timestamp] of sessionTimestamps.entries()) { + if (now - timestamp > SESSION_TIMEOUT_MS) { + console.error(`Cleaning up stale session: ${sessionId}`); + const transport = transports.get(sessionId); + if (transport) { + transport.close().catch(err => + console.error(`Error closing stale session ${sessionId}:`, err) + ); + } + transports.delete(sessionId); + sessionTimestamps.delete(sessionId); + } + } +}, 5 * 60 * 1000); // Check every 5 minutes // Initialize the MCP server let server: McpServer | null = null; @@ -44,6 +64,7 @@ app.post("/mcp", async (req: Request, res: Response) => { if (sessionId && transports.has(sessionId)) { // Reuse existing transport for this session transport = transports.get(sessionId)!; + sessionTimestamps.set(sessionId, Date.now()); // Update last activity console.error(`Reusing transport for session: ${sessionId}`); } else if (!sessionId) { // New session - create transport with session ID generator @@ -52,10 +73,12 @@ app.post("/mcp", async (req: Request, res: Response) => { onsessioninitialized: (newSessionId) => { console.error(`Session initialized: ${newSessionId}`); transports.set(newSessionId, transport); + sessionTimestamps.set(newSessionId, Date.now()); }, onsessionclosed: (closedSessionId) => { console.error(`Session closed: ${closedSessionId}`); transports.delete(closedSessionId); + sessionTimestamps.delete(closedSessionId); } }); @@ -191,3 +214,7 @@ const httpServer = app.listen(PORT, HOST, () => { console.error(`Server error: ${err}`); process.exit(1); }); + +// Set server timeout to prevent hanging connections +httpServer.timeout = 120000; // 2 minutes +httpServer.keepAliveTimeout = 65000; // 65 seconds