How do I implement AWS Cognito User Pools and Identity Federation?

Introduction

In this guide, we’ll walk through the steps to implement AWS Cognito user pools and configure identity federation. We’ll create the user pool, add a user pool client, and then set up identity federation to allow users to authenticate using an external identity provider like Google.

Description

The program below demonstrates how to define an AWS Cognito User Pool and configure a user pool client. It also includes the setup for identity federation using an external identity provider. Let’s break down what each part does and why it is needed.

Key Points

AWS Cognito User Pool: Creating a user pool to manage and store user profiles.
User Pool Client: Configuring an application that will interact with the Cognito user pool.
Identity Provider: Setting up an external identity provider (like Google) for federated authentication.

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Create a Cognito User Pool
const userPool = new aws.cognito.UserPool("user_pool", {
    name: "example_user_pool",
    passwordPolicy: {
        minimumLength: 8,
        requireLowercase: true,
        requireUppercase: true,
        requireNumbers: true,
        requireSymbols: true,
    },
    schemas: [{
        name: "email",
        required: true,
        attributeDataType: "String",
        mutable: false,
    }],
    autoVerifiedAttributes: ["email"],
});
// Create a User Pool Client
const userPoolClient = new aws.cognito.UserPoolClient("user_pool_client", {
    name: "example_user_pool_client",
    userPoolId: userPool.id,
    generateSecret: false,
    allowedOauthFlows: ["code"],
    allowedOauthScopes: [
        "phone",
        "email",
        "openid",
        "profile",
    ],
    supportedIdentityProviders: [
        "COGNITO",
        "Google",
    ],
});
// Define an Identity Provider for Federated Login (e.g., Google)
const google = new aws.cognito.IdentityProvider("google", {
    userPoolId: userPool.id,
    providerName: "Google",
    providerType: "Google",
    providerDetails: {
        client_id: "YOUR_GOOGLE_CLIENT_ID",
        client_secret: "YOUR_GOOGLE_CLIENT_SECRET",
        authorize_scopes: "openid email profile",
    },
    attributeMapping: {
        email: "email",
        given_name: "given_name",
        family_name: "family_name",
        profile: "profile",
    },
});
export const userPoolId = userPool.id;
export const userPoolClientId = userPoolClient.id;

Key Points

Defined an AWS Cognito user pool with a password policy and email verification.
Created a user pool client for the application to interact with the user pool.
Configured an external identity provider (Google) for identity federation.

Conclusion

In this guide, you learned how to set up an AWS Cognito User Pool along with a User Pool Client and configure identity federation with an external provider like Google. This provides your application with a robust, scalable authentication system using AWS Cognito.

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