Set up Amplify Auth

Install the necessary dependencies by running the following command:

npm install @aws-amplify/react-native @react-native-community/netinfo @react-native-async-storage/async-storage react-native-get-random-values

Prerequisites: Install and configure the Amplify CLI in addition to the Amplify libraries and necessary dependencies.

To import existing Amazon Cognito resources into your Amplify project, execute the command:

amplify import auth

? What type of auth resource do you want to import?
   Cognito User Pool and Identity Pool
   Cognito User Pool only

Once you've selected an option, you'll be able to search for and import an existing Cognito User Pool and Identity Pool (or User Pool only) within your AWS account. The amplify import auth command will also do the following:

• Automatically populate your Amplify Library configuration files (aws-exports.js, amplifyconfiguration.json) with your chosen Amazon Cognito resource information
• Provide your designated existing Cognito resource as the authentication & authorization mechanism for all auth-dependent categories (API, Storage and more)
• Enable Lambda functions to access the chosen Cognito resource if you permit it

If you have previously enabled an Amplify category that uses Auth behind the scenes (e.g. API category), you can run the amplify update auth command to edit your configuration if needed.

After configuring your Authentication options, update your backend and deploy the service by running the push command:

amplify push

Now, the authentication service has been deployed and you can start using it. To view the deployed services in your project at any time, go to Amplify Console by running the following command:

amplify console

In your app's entry point (i.e. App.js, index.js, _app.js, or main.js), import and load the configuration file:

import { Amplify, Auth } from 'aws-amplify';
import amplifyconfig from './amplifyconfiguration.json';
Amplify.configure(amplifyconfig);

Prerequisites: Install and configure the Amplify CLI in addition to the Amplify libraries and necessary dependencies.

Amplify Studio allows you create auth resources, set up authorization rules, implement Multi-factor authentication (MFA), and more via an intuitive UI. To set up Authentication through the Amplify Studio, take the following steps:

1. Sign in to the AWS Management Console and open AWS Amplify.
2. In the navigation pane, choose an application.
3. On the application information page, choose the Backend environments tab, then choose Launch Studio.
4. On the Set up menu, choose Authentication.
5. In the Configure log in section, choose a login mechanism to add from the Add login mechanism list. Valid options are Username, Phone number, Facebook, Google, Amazon, and Sign in with Apple. If you choose one of the social sign-in mechanisms (i.e. Facebook, Google, Amazon, or Sign in with Apple), you will also need to enter your App ID, App Secret, and redirect URLs.
6. (Optional) Add multi-factor authentication (MFA). MFA is set to Off by default. To turn on MFA, do the following in the Multi-factor authentication section:

• Choose Enforced to require MFA for all users or choose Optional to allow individual users to enable MFA.
• (Optional) Choose SMS, and enter your SMS message.
• (Optional) Choose Authenticator Application if you want your app to load with an authentication flow that includes sign up and sign in.

7. In the Configure sign up section, expand Password protection settings and customize the password policy settings to enforce. u6. Choose Save and Deploy. This starts a CloudFormation deployment with the progress displayed in the upper right corner of the page.
8. After creating and configuring your auth resources, you'll need to pull them down from Amplify Studio. To do so, simply click on "Local setup instructions" in the upper right hand corner of the Studio console and execute the CLI command it provides at the root directory of your app.

You can also import existing Amazon Cognito resources and manage users and groups through the Amplify Studio UI.

Existing Authentication resources from AWS (e.g. Amazon Cognito UserPools or Identity Pools) can be used with the Amplify Libraries by calling the Amplify.configure() method.

In your app's entry point (i.e. App.js, index.js, _app.js, or main.js), import and load the configuration file:

import { Amplify } from 'aws-amplify';

Amplify.configure({
  Auth: {
    Cognito: {
      //  Amazon Cognito User Pool ID
      userPoolId: 'XX-XXXX-X_abcd1234',

      // OPTIONAL - Amazon Cognito Web Client ID (26-char alphanumeric string)
      userPoolClientId: 'a1b2c3d4e5f6g7h8i9j0k1l2m3',
      // REQUIRED only for Federated Authentication - Amazon Cognito Identity Pool ID
      identityPoolId: 'XX-XXXX-X:XXXXXXXX-XXXX-1234-abcd-1234567890ab',

      // OPTIONAL - This is used when autoSignIn is enabled for Auth.signUp
      // 'code' is used for Auth.confirmSignUp, 'link' is used for email link verification
      signUpVerificationMethod: 'code', // 'code' | 'link'
      loginWith: {
        // OPTIONAL - Hosted UI configuration
        oauth: {
          domain: 'your_cognito_domain',

          scopes: [
            'phone',
            'email',
            'profile',
            'openid',
            'aws.cognito.signin.user.admin'
          ],
          redirectSignIn: ['http://localhost:3000/'],
          redirectSignOut: ['http://localhost:3000/'],
          responseType: 'code' // or 'token', note that REFRESH token will only be generated when the responseType is code
        }
      }
    }
  }
});

// You can get the current config object
const currentConfig = Amplify.getConfig();

OAuth configuration parameters:

These settings can be found in the Cognito User Pools console under App Integration section

• domain: This can be found in the Domain name sub section
• scope: Remember to have the scope allowed on the Cognito App client, this can be found on App client settings sub section
• redirectSignIn: URL must be present on Callback URL(s) , check on App client settings sub section
• redirectSignOut: URL must be present on Sign out URL(s), check on App client settings sub section
• responseType: Option must be enabled on the App client, look for Allowed OAuth Flows on App client settings sub section. Authorization code grant is for 'code' value and Implicit grant is for 'token' value.