I have recently created a small library for managing user accounts through AWS Cognito service.

Cognitex

The following functionality is covered;

• User registration

• Confirm registration (with the confirmation code received from AWS, by email)

• User authentication

• Fetch user data by an access token

• Fetch user data by username

• Change user password

• Update user attributes

• Reset a forgotten password

Installation

To use cognitex with your projects, edit your mix.exs file to add it as a dependency:

def deps do
[
  {:cognitex, "~> 0.1.0"}
]
end

Configuration

An example config might look like this:

config :aws,
  key: "<AWS_ACCESS_KEY_ID>",
  secret: "<AWS_SECRET_ACCESS_KEY>",
  region: "<AWS_REGION>",
  client_id: "<AWS_CLIENT_ID>",
  user_pool_id: "<AWS_USER_POOL_ID>"

Set up AWS Cognito with the correct configuration

First, we will set up a new AWS Cognito user pool with the correct configuration.

1. Visit your AWS console and go to the AWS Cognito service. Click on “Manage your User Pools” and click “Create a User Pool”.

2. Specify a name for your pool and click “Review Defaults”.

3. Optional: edit the password policy to remove some of the requirements. If you are just testing, using simple passwords will make it easier.

4. Click the “edit client” link. Specify a name for your app and be sure to disable the client secret and enable the ADMIN_NO_SRP_AUTH option.

5. Click “Create pool”. Take note of the Pool Id at the top of the page and click on the apps page. Here, take note of the App client id.

Usage

iex> Cognitex.sign_up("john.smith@example.com", "Test123", name: "John", family_name: "Smith")
{:ok,
  %{
    "CodeDeliveryDetails" => %{
      "AttributeName" => "email",
      "DeliveryMedium" => "EMAIL",
      "Destination" => "j***@e***.co"
      },
      "UserConfirmed" => false,
      "UserSub" => "uuid"
      }
   }

iex> Cognitex.sign_up("john.smith@example.com", "Test123", name: "John", family_name: "Smith")

{:error,
  %{
    message: "An account with the given email already exists.",
    status: "UsernameExistsException"
  }
}

Full documentation is available here.

Thanks!