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* Authentication Helper
* Supports both JWT (Cognito) and API Key authentication
*/
const { DynamoDBClient } = require('@aws-sdk/client-dynamodb')
const { DynamoDBDocumentClient, GetCommand } = require('@aws-sdk/lib-dynamodb')
const crypto = require('crypto')
const client = new DynamoDBClient({})
const docClient = DynamoDBDocumentClient.from(client)
// --- JWT verification via Cognito JWKs (for NONE-authorizer endpoints) ---
let jwksCache = null
let jwksCacheTime = 0
const JWKS_CACHE_TTL = 3600 * 1000 // 1 hour
async function getCognitoJwks() {
const now = Date.now()
if (jwksCache && now - jwksCacheTime < JWKS_CACHE_TTL) {
return jwksCache
}
const userPoolId = process.env.COGNITO_USER_POOL_ID
if (!userPoolId) return null
const region = process.env.AWS_REGION || 'eu-central-1'
const url = `https://cognito-idp.${region}.amazonaws.com/${userPoolId}/.well-known/jwks.json`
const response = await fetch(url)
if (!response.ok) return null
jwksCache = await response.json()
jwksCacheTime = now
return jwksCache
}
/**
* Verify a Cognito JWT from the Authorization header using JWKs signature verification.
* Returns the decoded payload or null if invalid.
*/
async function verifyJwtFromHeader(event) {
try {
const authHeader = event.headers?.Authorization || event.headers?.authorization
Eif (!authHeader?.startsWith('Bearer ')) return null
const token = authHeader.slice(7)
const parts = token.split('.')
if (parts.length !== 3) return null
const [headerB64, payloadB64, signatureB64] = parts
const header = JSON.parse(Buffer.from(headerB64, 'base64url').toString('utf8'))
const payload = JSON.parse(Buffer.from(payloadB64, 'base64url').toString('utf8'))
// Check token expiry
if (payload.exp && payload.exp < Date.now() / 1000) return null
// Get JWKs and find matching key by kid
const jwks = await getCognitoJwks()
if (!jwks?.keys) return null
const jwk = jwks.keys.find((k) => k.kid === header.kid)
if (!jwk) return null
// Import JWK and verify signature using Node.js crypto.subtle (Node 18+)
const key = await crypto.subtle.importKey(
'jwk',
jwk,
{ name: 'RSASSA-PKCS1-v1_5', hash: 'SHA-256' },
false,
['verify']
)
const data = Buffer.from(`${headerB64}.${payloadB64}`)
const signature = Buffer.from(signatureB64, 'base64url')
const valid = await crypto.subtle.verify('RSASSA-PKCS1-v1_5', key, signature, data)
if (!valid) return null
return payload
} catch {
return null
}
}
const API_KEYS_TABLE = process.env.API_KEYS_TABLE
/**
* Validate and extract authentication details from event
* Supports both Cognito JWT and API Keys
*
* @param {Object} event - Lambda event
* @returns {Promise<Object>} { type: 'jwt'|'apikey', tenantId, userId, permissions } or { error: string }
*/
async function authenticateRequest(event) {
try {
// 1. Check for JWT token (Cognito authorizer)
const tenantId = event.requestContext?.authorizer?.claims?.['custom:tenantId']
const userId = event.requestContext?.authorizer?.claims?.sub
if (tenantId && userId) {
// JWT authentication successful
// Note: JWT users' permissions are checked via RBAC system (not here)
return {
authenticated: true,
type: 'jwt',
tenantId,
userId,
source: 'cognito'
}
}
// 1b. Fallback: verify JWT from Authorization header when no Cognito authorizer
// (endpoints with authorizationType: NONE that also support API key auth)
const jwtPayload = await verifyJwtFromHeader(event)
Iif (jwtPayload) {
const jwtTenantId = jwtPayload['custom:tenantId']
const jwtUserId = jwtPayload.sub
if (jwtTenantId && jwtUserId) {
return {
authenticated: true,
type: 'jwt',
tenantId: jwtTenantId,
userId: jwtUserId,
source: 'cognito'
}
}
}
// 2. Check for API Key in headers
const apiKey = event.headers?.['x-api-key'] || event.headers?.['X-API-Key']
if (apiKey) {
// Validate API key
return await validateApiKey(apiKey)
}
// 3. No authentication provided
return { error: 'No valid authentication provided' }
} catch (error) {
// Convert thrown errors to error response
const errorMessage = error.message?.replace('UNAUTHORIZED: ', '') || 'Authentication failed'
return { error: errorMessage }
}
}
/**
* Validate API key and return auth details
* @param {string} apiKey - API key from request
* @returns {Promise<Object>} Auth details
* @throws {Error} If API key is invalid
*/
async function validateApiKey(apiKey) {
if (!apiKey || !apiKey.startsWith('apikey_')) {
throw new Error('UNAUTHORIZED: Invalid API key format')
}
// Hash the API key (we store hashes in DB for security)
const keyHash = hashApiKey(apiKey)
// Look up API key in database (we can't query by hash, so we need a pattern)
// For now, extract the ID from the key format: apikey_{id}_{secret}
const parts = apiKey.split('_')
if (parts.length < 3) {
throw new Error('UNAUTHORIZED: Invalid API key format')
}
const keyId = parts[1]
try {
const result = await docClient.send(
new GetCommand({
TableName: API_KEYS_TABLE,
Key: { id: keyId }
})
)
const keyRecord = result.Item
if (!keyRecord) {
throw new Error('UNAUTHORIZED: API key not found')
}
// Verify key hash matches
if (keyRecord.keyHash !== keyHash) {
throw new Error('UNAUTHORIZED: Invalid API key')
}
// Check if key is active
if (keyRecord.status !== 'active') {
throw new Error('UNAUTHORIZED: API key is revoked or inactive')
}
// Check expiration
if (keyRecord.expiresAt) {
const expiresAt = new Date(keyRecord.expiresAt)
if (expiresAt < new Date()) {
throw new Error('UNAUTHORIZED: API key has expired')
}
}
// Update last used timestamp (fire and forget)
updateLastUsed(keyId).catch((err) => {
console.error('Failed to update lastUsedAt:', err)
})
// Return auth details
return {
authenticated: true,
type: 'apikey',
keyId: keyRecord.id,
keyName: keyRecord.name,
tenantId: keyRecord.tenantId || null, // API keys can be tenant-specific or global
userId: null, // API keys are not user-specific
permissions: keyRecord.permissions || [],
allowedEntityIds: keyRecord.allowedEntityIds || [],
source: 'apikey'
}
} catch (error) {
if (error.message.startsWith('UNAUTHORIZED:')) {
throw error
}
console.error('Error validating API key:', error)
throw new Error('UNAUTHORIZED: Failed to validate API key')
}
}
/**
* Hash an API key for storage/comparison
* @param {string} apiKey - Plain text API key
* @returns {string} SHA-256 hash
*/
function hashApiKey(apiKey) {
return crypto.createHash('sha256').update(apiKey).digest('hex')
}
/**
* Update lastUsedAt timestamp for an API key
* @param {string} keyId - API key ID
*/
async function updateLastUsed(keyId) {
const { UpdateCommand } = require('@aws-sdk/lib-dynamodb')
await docClient.send(
new UpdateCommand({
TableName: API_KEYS_TABLE,
Key: { id: keyId },
UpdateExpression: 'SET lastUsedAt = :now',
ExpressionAttributeValues: {
':now': new Date().toISOString()
}
})
)
}
/**
* Check if auth has a specific permission
* @param {Object} auth - Auth object from authenticateRequest
* @param {string} permission - Permission to check (e.g., 'entities:read')
* @returns {boolean}
*/
function hasPermission(auth, permission) {
if (auth.type === 'jwt') {
return true // JWT users have all permissions
}
if (auth.type === 'apikey') {
return auth.permissions.includes('*') || auth.permissions.includes(permission)
}
return false
}
/**
* Check if auth can access a specific entity
* @param {Object} auth - Auth object from authenticateRequest
* @param {Object} entity - Entity object with tenantId and isPublic properties
* @returns {boolean}
*/
function canAccessEntity(auth, entity) {
// Entity is public - anyone can access (handle both string 'true' and boolean true)
if (entity.isPublic === 'true' || entity.isPublic === true) {
return true
}
// JWT users can access entities in their own tenant
if (auth.type === 'jwt') {
return entity.tenantId === auth.tenantId
}
// API key users: check allowedEntityIds and tenant access
if (auth.type === 'apikey') {
const allowed = auth.allowedEntityIds || []
console.error(
`[canAccessEntity] apikey=${auth.keyId} allowed=${JSON.stringify(allowed)} entity.id=${entity.id} entity.tenantId=${entity.tenantId} entity.isPublic=${entity.isPublic}`
)
const entityAllowed = allowed.includes('*') || allowed.includes(entity.id)
if (!entityAllowed) return false
// Wildcard: admin explicitly granted full access, skip tenant check
if (allowed.includes('*')) return true
// Explicit entity ID: also verify same tenant or public
return (
entity.tenantId === auth.tenantId || entity.isPublic === 'true' || entity.isPublic === true
)
}
return false
}
module.exports = {
authenticateRequest,
validateApiKey,
hashApiKey,
hasPermission,
canAccessEntity
}
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