Fitbit Provider for the PHP League's OAuth 2.0 Client
PHP
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jrquick17 and djchen Update README (#39)
When logging in as an existing user an error is thrown that 'oauth2state' does not exist in '$_SESSION'
Latest commit 2819f86 Jan 14, 2018

README.md

Fitbit Provider for OAuth 2.0 Client

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

This package is compliant with PSR-1, PSR-2, PSR-4, and PSR-7. If you notice compliance oversights, please send a patch via pull request.

Developers can register applications to use the Fitbit API at https://dev.fitbit.com/apps.

Requirements

The following versions of PHP are supported.

  • PHP 5.6
  • PHP 7.0
  • PHP 7.1
  • HHVM

Installation

To install, use composer:

composer require djchen/oauth2-fitbit

Usage

Authorization Code Grant

use djchen\OAuth2\Client\Provider\Fitbit;

$provider = new Fitbit([
    'clientId'          => '{fitbit-oauth2-client-id}',
    'clientSecret'      => '{fitbit-client-secret}',
    'redirectUri'       => 'https://example.com/callback-url'
]);

// start the session
session_start();

// If we don't have an authorization code then get one
if (!isset($_GET['code'])) {

    // Fetch the authorization URL from the provider; this returns the
    // urlAuthorize option and generates and applies any necessary parameters
    // (e.g. state).
    $authorizationUrl = $provider->getAuthorizationUrl();

    // Get the state generated for you and store it to the session.
    $_SESSION['oauth2state'] = $provider->getState();

    // Redirect the user to the authorization URL.
    header('Location: ' . $authorizationUrl);
    exit;

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

} else {

    try {

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

        // We have an access token, which we may use in authenticated
        // requests against the service provider's API.
        echo $accessToken->getToken() . "\n";
        echo $accessToken->getRefreshToken() . "\n";
        echo $accessToken->getExpires() . "\n";
        echo ($accessToken->hasExpired() ? 'expired' : 'not expired') . "\n";

        // Using the access token, we may look up details about the
        // resource owner.
        $resourceOwner = $provider->getResourceOwner($accessToken);

        var_export($resourceOwner->toArray());

        // The provider provides a way to get an authenticated API request for
        // the service, using the access token; it returns an object conforming
        // to Psr\Http\Message\RequestInterface.
        $request = $provider->getAuthenticatedRequest(
            Fitbit::METHOD_GET,
            Fitbit::BASE_FITBIT_API_URL . '/1/user/-/profile.json',
            $accessToken,
            ['headers' => [Fitbit::HEADER_ACCEPT_LANG => 'en_US'], [Fitbit::HEADER_ACCEPT_LOCALE => 'en_US']]
            // Fitbit uses the Accept-Language for setting the unit system used
            // and setting Accept-Locale will return a translated response if available.
            // https://dev.fitbit.com/docs/basics/#localization
        );
        // Make the authenticated API request and get the parsed response.
        $response = $provider->getParsedResponse($request);

        // If you would like to get the response headers in addition to the response body, use:
        //$response = $provider->getResponse($request);
        //$headers = $response->getHeaders();
        //$parsedResponse = $provider->parseResponse($response);

    } catch (\League\OAuth2\Client\Provider\Exception\IdentityProviderException $e) {

        // Failed to get the access token or user details.
        exit($e->getMessage());

    }

}

Refreshing a Token

Once your application is authorized, you can refresh an expired token using a refresh token rather than going through the entire process of obtaining a brand new token. To do so, simply reuse this refresh token from your data store to request a refresh.

$provider = new djchen\OAuth2\Client\Provider\Fitbit([
    'clientId'          => '{fitbit-oauth2-client-id}',
    'clientSecret'      => '{fitbit-client-secret}',
    'redirectUri'       => 'https://example.com/callback-url'
]);

$existingAccessToken = getAccessTokenFromYourDataStore();

if ($existingAccessToken->hasExpired()) {
    $newAccessToken = $provider->getAccessToken('refresh_token', [
        'refresh_token' => $existingAccessToken->getRefreshToken()
    ]);

    // Purge old access token and store new access token to your data store.
}

Testing

$ ./vendor/bin/phpunit

Contributing

Please see CONTRIBUTING for details.

License

The MIT License (MIT). Please see License File for more information.