Middy secrets-manager middleware

This middleware fetches secrets from AWS Secrets Manager.

Secrets to fetch can be defined by by name. See AWS docs here.

Secrets are assigned to the function handler's context object.

The Middleware makes a single API request for each secret as Secrets Manager does not support batch get.

For each secret, you also provide the name under which its value should be added to context.

Install

To install this middleware you can use NPM:

npm install --save @middy/secrets-manager

Options

• cache (boolean) (optional): Defaults to false. Set it to true to skip further calls to AWS Secrets Manager
• cacheExpiryInMillis (int) (optional): Defaults to undefined. Use this option to invalidate cached secrets from Secrets Manager
• secrets (object) : Map of secrets to fetch from Secrets Manager, where the key is the destination, and value is secret name or secret ARN in Secrets Manager. Example: {secrets: {RDS_LOGIN: 'dev/rds_login'}}
• awsSdkOptions (object) (optional): Options to pass to AWS.SecretsManager class constructor.
• throwOnFailedCall (boolean) (optional): Defaults to false. Set it to true if you want your lambda to fail in case call to AWS Secrets Manager fails (secrets don't exist or internal error). It will only print error if secrets are not already cached.
• setEnvironment (boolean) (optional): Defaults to false. Set it to true if you want to set the secrets as environment variables in addition to the context parameter. Praticularly useful for string secrets.

NOTES:

• Lambda is required to have IAM permission for secretsmanager:GetSecretValue action
• aws-sdk version of 2.176.0 or greater is required. If your project doesn't currently use aws-sdk, you may need to install it as a devDependency in order to run tests

Sample usage

const middy = require('@middy/core')
const secretsManager = require('@middy/secrets-manager')

const handler = middy((event, context, cb) => {
  cb(null, {})
})

 handler.use(secretsManager({
  cache: true,
  secrets: {
    RDS_LOGIN: 'dev/rds_login'
  }
}))

// Before running the function handler, the middleware will fetch from Secrets Manager
handler(event, context, (_, response) => {
  // assuming the dev/rds_login has two keys, 'Username' and 'Password'
  expect(context.RDS_LOGIN.Username).toEqual('username')
  expect(context.RDS_LOGIN.Password).toEqual('password')
})

Middy documentation and examples

For more documentation and examples, refers to the main Middy monorepo on GitHub or Middy official website.

Contributing

Everyone is very welcome to contribute to this repository. Feel free to raise issues or to submit Pull Requests.

License

Licensed under MIT License. Copyright (c) 2017-2018 Luciano Mammino and the Middy team.