Amazon Cognito Provider for OAuth 2.0 Client

This package provides Amazon Cognito OAuth 2.0 support for the PHP League's OAuth 2.0 Client.

Installation

To install, use composer:

composer require cakedc/oauth2-cognito

Usage

Usage is the same as The League's OAuth client, using \CakeDC\OAuth2\Client\Provider\Cognito as the provider.

Authorization Code Flow

$provider = new CakeDC\OAuth2\Client\Provider\Cognito([
    'clientId'          => '{cognito-client-id}',
    'clientSecret'      => '{cognito-client-secret}',
    'redirectUri'       => 'https://example.com/callback-url',
    'cognitoDomain'     => '{cognito-client-domain}', 
    'region'            => '{cognito-region}' 
]);

if (!isset($_GET['code'])) {

    // If we don't have an authorization code then get one
    $authUrl = $provider->getAuthorizationUrl();
    $_SESSION['oauth2state'] = $provider->getState();
    header('Location: '.$authUrl);
    exit;

// Check given state against previously stored one to mitigate CSRF attack
} elseif (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {

    unset($_SESSION['oauth2state']);
    exit('Invalid state');

} else {

    // Try to get an access token (using the authorization code grant)
    $token = $provider->getAccessToken('authorization_code', [
        'code' => $_GET['code']
    ]);

    // Optional: Now you have a token you can look up a users profile data
    try {

        // We got an access token, let's now get the user's details
        $user = $provider->getResourceOwner($token);

        // Use these details to create a new profile
        printf('Hello %s!', $user->getEmail());

    } catch (Exception $e) {

        // Failed to get user details
        exit(':(');
    }
}

Managing Scopes

When creating your Amazon Cognito authorization URL, you can specify the state and scopes your application may authorize.

$options = [
    'state' => 'OPTIONAL_CUSTOM_CONFIGURED_STATE',
    'scope' => ['email','phone','profile']
];

$authorizationUrl = $provider->getAuthorizationUrl($options);

If neither are defined, the provider will utilize internal defaults.

At the time of authoring this documentation, the following scopes are available:

phone
email
profile
openid (required for phone, email or profile)
aws.cognito.signin.user.admin

Hosted domain

Optionally, if you are using your own domain for you client, you can configure it instead of cognitoDomain option when the provider is initialized:

$provider = new CakeDC\OAuth2\Client\Provider\Cognito([
    'clientId'          => '{cognito-client-id}',
    'clientSecret'      => '{cognito-client-secret}',
    'redirectUri'       => 'https://example.com/callback-url',
    'hostedDomain'      => '{cognito-hosted-domain}', //Full domain without trailing slash
]);

Testing

$ ./vendor/bin/phpunit

CakeDC / oauth2-cognito

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