Serverless AWS Cognito Component

The Cognito Serverless Component allows you to easily and quickly create an AWS Cognito User Pool which you can then reference in other components or deploy by itself.

Features

• Fast Deployments (~6 seconds on average)
• Supports Various authTemplates
• Create New Cognito User Pools & Cognito User Pool Clients
• Remove Cognito User Pools & Cognito User Pool Clients
• Update Cognito User Pools & Cognito User Pool Clients
• Create New Cognito Identity Pools
• Remove Cognito Identity Pools
• Update Cognito Identity Pools
• Supports Full AWS-SDK Options for Cognito User Pool
• Supports Full AWS-SDK Options for Cognito User Pool Client
• Supports Full AWS-SDK Options for Cognito Identity Pools

Contents

1. Install
2. Create
3. Configure
   • Basic Configuration
   • Auth Templates
   • Custom Params
4. Deploy
5. Remove

1. Install

$ npm install -g serverless

2. Create

Just create the following simple boilerplate:

$ touch serverless.yml # more info in the "Configure" section below
$ touch .env           # your AWS api keys

# .env
AWS_ACCESS_KEY_ID=XXX
AWS_SECRET_ACCESS_KEY=XXX

3. Configure

Basic Configuration

The following is a simple configuration that lets you get up and running with a Cognito User Pool and Cognito User Pool Client which is needed for simple Cognito User Pool authentication for AWS API Gateway and AWS AppSync. Just add it to the serverless.yml file:

cognitoUserPool:
  component: '@serverless/aws-cognito'
  inputs:
    region: us-east-1
    authTemplate: COGNITO_USER_POOL # Creates Cognito User Pool + Cognito User Pool Client

This simple configuration above will take the default settings which is equivalent to the following:

cognitoUserPool:
  component: '@serverless/aws-cognito'
  inputs:
    region: us-east-1
    authTemplate: CUSTOM_PARAMS # ** Required - when passing aws-sdk params **
    
    # Docs: https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_UserPoolType.html

    # *** Pass the AWS-SDK params for Cognito User Pool directly for custom use cases ***
    userPoolParams:
      PoolName: app-users-dev
      MfaConfiguration: 'OFF'  # OFF | ON | OPTIONAL
      Policies:
        PasswordPolicy:
          MinimumLength: 8  # 'NUMBER_VALUE'
          RequireLowercase: true  # true || false
          RequireNumbers: true  # true || false
          RequireSymbols: false  # true || false
          RequireUppercase: true  # true || false
      UserPoolTags:
        'Owner': 'John Smith'
        'Application': 'App'
      UsernameAttributes:
        - email
      VerificationMessageTemplate:
        DefaultEmailOption: CONFIRM_WITH_LINK  # CONFIRM_WITH_LINK | CONFIRM_WITH_CODE
        EmailMessage: 'Welcome to our app, please click the link {####}'
        EmailSubject: 'Verification Email - App'
   
    # *** Pass the AWS-SDK params for User Pool Client directly for custom use cases ***
    userPoolClientParams:
      ClientName: app-users-dev-client-name
      GenerateSecret: false

    # *** Pass the AWS-SDK params for Cognito Identity Pool directly for custom use cases ***
    # COMING SOON

For more advanced usage, keep reading!

Auth Templates

Auth Templates are a way for you to pass little to zero configuration and have entire AWS Cognito use-cases created automatically.

Auth Templates are defined inside your serverless.yml using the following syntax, authTemplate: [value]. Currently we support the following authTemplates:

• COGNITO_USER_POOL authentication
• CUSTOM_PARAMS authentication (pass AWS-SDK args directly)
• AWS_IAM authentication
• MFA with phone_number
• MFA with email

We would like to make this component even easier to work with so over time we will add additional use-cases. This will give developers even more flexibility and speed up development by specifying an authTemplate in your serverless.yml:

cognitoUserPool:
  component: '@serverless/aws-cognito'
  inputs:
    region: us-east-1
    authTemplate: COGNITO_USER_POOL  # COGNITO_USER_POOL | CUSTOM_PARAMS | AWS_IAM | MFA_EMAIL | MFA_SMS

Custom Params

As you can see in the example above, we are passing a property called authTemplate which is set to CUSTOM_PARAMS then we are able to pass userPoolParams and userPoolClientParams to create our AWS Cognito User Pool and AWS Cognito User Pool Client with our own custom settings.

Visit the AWS-SDK Documentation for AWS Cognito and you will see that every argument listed in the documentation can be passed to the component via the serverless.yml file using userPoolParams or userPoolClientParams.

Meaning you're not limited, this component supports everything the AWS-SDK supports immediately and always.

4. Deploy

To deploy, just run the following command in the directory containing your serverless.yml file:

$ serverless --debug

After few seconds (up to a minute if it's your first deployment), you should see an output like this:

  cognitoUserPool: 
    poolId:   us-east-1_uX8ixlvfF
    clientId: t1phrmu3tdnhb2h2b60606bup

  1s › cognitoUserPool › done

myApp (master)$

5. Remove

To remove, just run the following command in the directory containing your serverless.yml file:

$ serverless remove --debug

In less than a couple of seconds, you should see something like this:

  DEBUG ─ User Pool Client: t1phrmu3tdnhb2h2b60606bup has been deleted
  DEBUG ─ User Pool: us-east-1_uX8ixlvfF has been deleted

  1s › cognitoUserPool › done

myApp (master)$

 

New to Components?

Checkout the Serverless Components repo for more information.