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* Token Utilities for OAuth
*
* Provides JWT creation/verification and PKCE utilities for OAuth 2.1 compliance.
* Uses Node.js crypto module for all cryptographic operations.
*/
import * as crypto from "crypto";
import { MCPTokenPayload } from "./types";
// ============================================================
// JWT Functions
// ============================================================
/**
* Create a JWT token
*
* Creates a signed JWT using HMAC-SHA256.
*
* @param payload - Token payload (will have iat and exp added)
* @param secret - Secret key for signing
* @param expiresIn - Token lifetime in seconds
* @returns Signed JWT string
*/
export function createJWT(
payload: Record<string, unknown>,
secret: string,
expiresIn: number
): string {
const header = { alg: "HS256", typ: "JWT" };
const now = Math.floor(Date.now() / 1000);
const fullPayload = {
...payload,
iat: now,
exp: now + expiresIn,
};
const headerB64 = base64UrlEncode(JSON.stringify(header));
const payloadB64 = base64UrlEncode(JSON.stringify(fullPayload));
const signature = crypto
.createHmac("sha256", secret)
.update(`${headerB64}.${payloadB64}`)
.digest("base64url");
return `${headerB64}.${payloadB64}.${signature}`;
}
/**
* Verify and decode a JWT token
*
* Verifies the signature and checks expiration.
*
* @param token - JWT token to verify
* @param secret - Secret key used for signing
* @returns Decoded payload if valid, null if invalid or expired
*/
export function verifyJWT(token: string, secret: string): Record<string, unknown> | null {
try {
const parts = token.split(".");
if (parts.length !== 3) {
return null;
}
const [headerB64, payloadB64, signature] = parts;
// Verify signature
const expectedSig = crypto
.createHmac("sha256", secret)
.update(`${headerB64}.${payloadB64}`)
.digest("base64url");
if (signature !== expectedSig) {
return null;
}
// Decode payload
const payload = JSON.parse(base64UrlDecode(payloadB64)) as Record<string, unknown>;
// Check expiration
const exp = payload.exp as number | undefined;
if (exp && exp < Math.floor(Date.now() / 1000)) {
return null;
}
return payload;
} catch {
return null;
}
}
/**
* Verify JWT and return typed MCP token payload
*
* @param token - JWT token to verify
* @param secret - Secret key used for signing
* @returns MCPTokenPayload if valid, null if invalid
*/
export function verifyMCPToken(token: string, secret: string): MCPTokenPayload | null {
const payload = verifyJWT(token, secret);
if (!payload) {
return null;
}
// Validate required fields
if (
typeof payload.iss !== "string" ||
typeof payload.sub !== "string" ||
typeof payload.aud !== "string" ||
typeof payload.sid !== "string" ||
typeof payload.scope !== "string" ||
typeof payload.gitlab_user !== "string" ||
typeof payload.iat !== "number" ||
typeof payload.exp !== "number"
) {
return null;
}
return payload as unknown as MCPTokenPayload;
}
// ============================================================
// PKCE Functions (for OAuth 2.1 compliance)
// ============================================================
/**
* Generate a cryptographically random code verifier for PKCE
*
* @returns Base64URL-encoded random string (43-128 characters)
*/
export function generateCodeVerifier(): string {
return crypto.randomBytes(32).toString("base64url");
}
/**
* Generate a code challenge from a code verifier using S256 method
*
* @param verifier - The code verifier
* @returns Base64URL-encoded SHA256 hash of the verifier
*/
export function generateCodeChallenge(verifier: string): string {
return crypto.createHash("sha256").update(verifier).digest("base64url");
}
/**
* Verify a code challenge against a code verifier
*
* @param verifier - The code verifier from the token request
* @param challenge - The code challenge from the authorization request
* @param method - The challenge method (only S256 is supported)
* @returns true if the verifier matches the challenge
*/
export function verifyCodeChallenge(verifier: string, challenge: string, method: string): boolean {
if (method !== "S256") {
// Only S256 is supported per OAuth 2.1
return false;
}
return generateCodeChallenge(verifier) === challenge;
}
// ============================================================
// Random String Generation
// ============================================================
/**
* Generate a cryptographically secure random string
*
* @param length - Desired length of the string (default: 32)
* @returns Base64URL-encoded random string
*/
export function generateRandomString(length: number = 32): string {
// Generate enough bytes to produce the desired length after base64url encoding
const byteLength = Math.ceil((length * 3) / 4);
return crypto.randomBytes(byteLength).toString("base64url").slice(0, length);
}
/**
* Generate a UUID v4
*
* @returns UUID string in standard format (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx)
*/
export function generateUUID(): string {
return crypto.randomUUID();
}
/**
* Generate an authorization code
*
* @returns 32-character random authorization code
*/
export function generateAuthorizationCode(): string {
return generateRandomString(32);
}
/**
* Generate a session ID
*
* @returns UUID for session identification
*/
export function generateSessionId(): string {
return generateUUID();
}
/**
* Generate an MCP refresh token
*
* @returns 64-character random refresh token
*/
export function generateRefreshToken(): string {
return generateRandomString(64);
}
// ============================================================
// Base64URL Encoding/Decoding
// ============================================================
/**
* Encode a string to Base64URL format
*/
function base64UrlEncode(str: string): string {
return Buffer.from(str, "utf-8").toString("base64url");
}
/**
* Decode a Base64URL string
*/
function base64UrlDecode(str: string): string {
return Buffer.from(str, "base64url").toString("utf-8");
}
// ============================================================
// Token Timing Utilities
// ============================================================
/**
* Check if a token is about to expire
*
* @param expiryMs - Token expiry timestamp in milliseconds
* @param bufferMs - Buffer time before expiry (default: 5 minutes)
* @returns true if the token will expire within the buffer time
*/
export function isTokenExpiringSoon(expiryMs: number, bufferMs: number = 5 * 60 * 1000): boolean {
return Date.now() + bufferMs >= expiryMs;
}
/**
* Calculate token expiry timestamp
*
* @param expiresIn - Token lifetime in seconds
* @returns Expiry timestamp in milliseconds
*/
export function calculateTokenExpiry(expiresIn: number): number {
return Date.now() + expiresIn * 1000;
}
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