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<?php
namespace OAuthOAuth2Service;

use OAuthOAuth2TokenStdOAuth2Token;
use OAuthCommonHttpExceptionTokenResponseException;
use OAuthCommonHttpUriUri;
use OAuthCommonConsumerCredentials;
use OAuthCommonHttpClientClientInterface;
use OAuthCommonStorageTokenStorageInterface;
use OAuthCommonHttpUriUriInterface;

/**
 * PayPal service.
 *
 * @author Flávio Heleno <flaviohbatista@gmail.com>
 * @link https://developer.paypal.com/webapps/developer/docs/integration/direct/log-in-with-paypal/detailed/
 */
class Paypal extends AbstractService
{
    /**
     * Defined scopes
     * @link https://developer.paypal.com/webapps/developer/docs/integration/direct/log-in-with-paypal/detailed/#attributes
     */

    const SCOPE_OPENID           = 'openid';
    const SCOPE_PROFILE          = 'profile';
    const SCOPE_PAYPALATTRIBUTES = 'https://uri.paypal.com/services/paypalattributes';
    const SCOPE_EMAIL            = 'email';
    const SCOPE_ADDRESS          = 'address';
    const SCOPE_PHONE            = 'phone';
    const SCOPE_EXPRESSCHECKOUT  = 'https://uri.paypal.com/services/expresscheckout';

    public function __construct(Credentials $credentials, ClientInterface $httpClient, TokenStorageInterface $storage, $scopes = array(), UriInterface $baseApiUri = null)
    {
        parent::__construct($credentials, $httpClient, $storage, $scopes, $baseApiUri);
        if( null === $baseApiUri ) {
            $this->baseApiUri = new Uri('https://api.paypal.com/v1/');
        }
    }

    /**
     * @return OAuthCommonHttpUriUriInterface
     */
    public function getAuthorizationEndpoint()
    {
        return new Uri('https://www.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize');
    }

    /**
     * @return OAuthCommonHttpUriUriInterface
     */
    public function getAccessTokenEndpoint()
    {
        return new Uri('https://api.paypal.com/v1/identity/openidconnect/tokenservice');
    }

    /**
     * Returns a class constant from ServiceInterface defining the authorization method used for the API
     * Header is the sane default.
     *
     * @return int
     */
    protected function getAuthorizationMethod()
    {
        return static::AUTHORIZATION_METHOD_HEADER_BEARER;
    }

    /**
     * @param string $responseBody
     * @return OAuthCommonTokenTokenInterface|OAuthOAuth2TokenStdOAuth2Token
     * @throws OAuthCommonHttpExceptionTokenResponseException
     */
    protected function parseAccessTokenResponse($responseBody)
    {
        $data = json_decode( $responseBody, true );

        if( null === $data || !is_array($data) ) {
            throw new TokenResponseException('Unable to parse response.');
        } elseif( isset($data['message'] ) ) {
            throw new TokenResponseException('Error in retrieving token: "' . $data['message'] . '"');
        } elseif( isset($data['name'] ) ) {
            throw new TokenResponseException('Error in retrieving token: "' . $data['name'] . '"');
        }

        $token = new StdOAuth2Token();

        $token->setAccessToken( $data['access_token'] );
        $token->setLifeTime( $data['expires_in'] );

        if( isset($data['refresh_token'] ) ) {
            $token->setRefreshToken( $data['refresh_token'] );
            unset($data['refresh_token']);
        }

        unset( $data['access_token'] );
        unset( $data['expires_in'] );
        $token->setExtraParams( $data );

        return $token;
    }
}