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# Auth0 Provider for OAuth 2.0 Client

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This package provides Auth0 OAuth 2.0 support for the PHP League's [OAuth 2.0 Client](https://github.com/thephpleague/oauth2-client).

## Installation

To install, use composer:

```
composer require riskio/oauth2-auth0
```

## Usage

Usage is the same as The League's OAuth client, using `Riskio\OAuth2\Client\Provider\Auth0` as the provider.

### Authorization Code Flow

You have to provide some parameters to the provider:

- customDomain (optional):
   - description: Custom domain used for the Auth0 login - https://auth0.com/docs/custom-domains
     (I.e.: login.custom-domain.tld - It will be prefixed with https:// automatically. If this is set, the region and account parameters will be ignored.)
- region (optional):
   - description: Auth0 region
   - values:
      - Riskio\OAuth2\Client\Provider\Auth0::REGION_US (default value)
      - Riskio\OAuth2\Client\Provider\Auth0::REGION_EU
      - Riskio\OAuth2\Client\Provider\Auth0::REGION_AU
      - Riskio\OAuth2\Client\Provider\Auth0::REGION_JP
- account (required if customDomain is not set):
   - description: Auth0 account name
- clientId
   - description: The client ID assigned to you by the provider
- clientSecret
   - description: The client password assigned to you by the provider
- redirectUri

```php

session_start();

$provider = new Riskio\OAuth2\Client\Provider\Auth0([
    'region'       => '{region}',
    'account'      => '{account}',
    'clientId'     => '{auth0-client-id}',
    'clientSecret' => '{auth0-client-secret}',
    'redirectUri'  => 'https://example.com/callback-url'
]);

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->getName());

} catch (Exception $e) {

// Failed to get user details
        exit('Oh dear...');
    }

// Use this to interact with an API on the users behalf
    echo $token->getToken();
}
```

## Refreshing a Token

Auth0's OAuth implementation does not use refresh tokens.

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