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* Security Middleware for Coherent.js API Framework
* @fileoverview Provides authentication, authorization, and security utilities
*/
import { createHmac, randomBytes, pbkdf2Sync } from 'crypto';
import { Buffer } from 'buffer';
/**
* Base64 URL encode
* @param {string} str - String to encode
* @returns {string} Base64 URL encoded string
*/
function base64UrlEncode(str) {
return Buffer.from(str)
.toString('base64')
.replace(/\+/g, '-')
.replace(/\//g, '_')
.replace(/=/g, '');
}
/**
* Base64 URL decode
* @param {string} str - Base64 URL encoded string
* @returns {string} Decoded string
*/
function base64UrlDecode(str) {
// Add padding if needed
str += '='.repeat((4 - str.length % 4) % 4);
return Buffer.from(str.replace(/-/g, '+').replace(/_/g, '/'), 'base64').toString();
}
/**
* Create HMAC signature for JWT
* @param {string} data - Data to sign
* @param {string} secret - Secret key
* @returns {string} HMAC signature
*/
function createSignature(data, secret) {
return createHmac('sha256', secret).update(data).digest('base64')
.replace(/\+/g, '-')
.replace(/\//g, '_')
.replace(/=/g, '');
}
/**
* Generate JWT token
* @param {Object} payload - Token payload
* @param {string} expiresIn - Expiration time (e.g., '1h', '30m', '7d')
* @param {string} secret - Secret key
* @returns {string} JWT token
*/
export function generateJWT(payload, expiresIn = '1h', secret = 'your-secret-key') {
const header = {
alg: 'HS256',
typ: 'JWT'
};
// Calculate expiration time
const now = Math.floor(Date.now() / 1000);
let exp = now;
if (expiresIn.endsWith('h')) {
exp += parseInt(expiresIn) * 3600;
} else if (expiresIn.endsWith('m')) {
exp += parseInt(expiresIn) * 60;
} else if (expiresIn.endsWith('d')) {
exp += parseInt(expiresIn) * 86400;
} else {
exp += 3600; // Default 1 hour
}
const tokenPayload = {
...payload,
iat: now,
exp: exp
};
const encodedHeader = base64UrlEncode(JSON.stringify(header));
const encodedPayload = base64UrlEncode(JSON.stringify(tokenPayload));
const data = `${encodedHeader}.${encodedPayload}`;
const signature = createSignature(data, secret);
return `${data}.${signature}`;
}
/**
* JWT token verification
* @param {string} token - Bearer token or JWT token
* @param {string} secret - Secret key
* @returns {Object|null} Decoded payload or null if invalid
*/
export function verifyToken(token, secret = 'your-secret-key') {
try {
let jwtToken = token;
// Handle Bearer token format
if (token && token.startsWith('Bearer ')) {
jwtToken = token.slice(7);
}
if (!jwtToken) {
return null;
}
// Split JWT into parts
const parts = jwtToken.split('.');
if (parts.length !== 3) {
return null;
}
const [encodedHeader, encodedPayload, signature] = parts;
// Verify signature
const data = `${encodedHeader}.${encodedPayload}`;
const expectedSignature = createSignature(data, secret);
if (signature !== expectedSignature) {
return null;
}
// Decode and parse payload
const payload = JSON.parse(base64UrlDecode(encodedPayload));
// Check expiration
const now = Math.floor(Date.now() / 1000);
if (payload.exp && payload.exp < now) {
return null; // Token expired
}
return payload;
} catch {
return null;
}
}
/**
* Authentication middleware
* @param {Object} options - Auth options
* @returns {Function} Middleware function
*/
export function withAuth(options = {}) {
const { secret, required = true } = options;
return (req, res) => {
const authHeader = req.headers.authorization;
const user = verifyToken(authHeader, secret);
if (required && !user) {
res.writeHead(401, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ error: 'Unauthorized' }));
return;
}
req.user = user;
return null; // Continue to next middleware
};
}
/**
* Authorization middleware
* @param {string|Array} roles - Required roles
* @returns {Function} Middleware function
*/
export function withRole(roles) {
const requiredRoles = Array.isArray(roles) ? roles : [roles];
return (req, res) => {
if (!req.user) {
res.writeHead(401, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ error: 'Unauthorized' }));
return;
}
if (!requiredRoles.includes(req.user.role)) {
res.writeHead(403, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ error: 'Forbidden' }));
return;
}
return null; // Continue to next middleware
};
}
/**
* Password hashing utility
* @param {string} password - Plain text password
* @returns {string} Hashed password
*/
export function hashPassword(password) {
const salt = randomBytes(16).toString('hex');
const hash = pbkdf2Sync(password, salt, 10000, 64, 'sha512').toString('hex');
return `${salt}:${hash}`;
}
/**
* Password verification utility
* @param {string} password - Plain text password
* @param {string} hashedPassword - Hashed password from database
* @returns {boolean} True if password matches
*/
export function verifyPassword(password, hashedPassword) {
try {
const [salt, hash] = hashedPassword.split(':');
const verifyHash = pbkdf2Sync(password, salt, 10000, 64, 'sha512').toString('hex');
return hash === verifyHash;
} catch {
return false;
}
}
/**
* Generate secure random token (for non-JWT use cases)
* @param {number} length - Token length
* @returns {string} Random token
*/
export function generateToken(length = 32) {
return randomBytes(length).toString('hex');
}
/**
* Input validation middleware
* @param {Object} rules - Validation rules
* @returns {Function} Middleware function
*/
export function withInputValidation(rules) {
return (req, res) => {
const errors = [];
for (const [field, rule] of Object.entries(rules)) {
const value = req.body[field];
if (rule.required && (value === undefined || value === null || value === '')) {
errors.push(`${field} is required`);
continue;
}
if (value !== undefined && rule.type && typeof value !== rule.type) {
errors.push(`${field} must be of type ${rule.type}`);
}
if (value && rule.minLength && value.length < rule.minLength) {
errors.push(`${field} must be at least ${rule.minLength} characters`);
}
if (value && rule.maxLength && value.length > rule.maxLength) {
errors.push(`${field} must be at most ${rule.maxLength} characters`);
}
if (value && rule.pattern && !rule.pattern.test(value)) {
errors.push(`${field} format is invalid`);
}
}
if (errors.length > 0) {
res.writeHead(400, { 'Content-Type': 'application/json' });
res.end(JSON.stringify({ error: 'Validation failed', details: errors }));
return;
}
return null; // Continue to next middleware
};
}
export default {
verifyToken,
generateJWT,
withAuth,
withRole,
hashPassword,
verifyPassword,
generateToken,
withInputValidation
};
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