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<?php

namespace OAuth\OAuth2\Service;

use OAuth\OAuth2\Token\StdOAuth2Token;
use OAuth\Common\Http\Exception\TokenResponseException;
use OAuth\Common\Http\Uri\Uri;
use OAuth\Common\Consumer\CredentialsInterface;
use OAuth\Common\Http\Client\ClientInterface;
use OAuth\Common\Storage\TokenStorageInterface;
use OAuth\Common\Http\Uri\UriInterface;

/**
 * Dropbox service.
 *
 * @author FlÃ¡vio Heleno <flaviohbatista@gmail.com>
 * @link https://www.dropbox.com/developers/core/docs
 */
class Dropbox extends AbstractService
{
    public function __construct(
        CredentialsInterface $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.dropbox.com/1/');
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getAuthorizationUri(array $additionalParameters = array())
    {
        $parameters = array_merge(
            $additionalParameters,
            array(
                'client_id'     => $this->credentials->getConsumerId(),
                'redirect_uri'  => $this->credentials->getCallbackUrl(),
                'response_type' => 'code',
            )
        );

        $parameters['scope'] = implode(' ', $this->scopes);

        // Build the url
        $url = clone $this->getAuthorizationEndpoint();
        foreach ($parameters as $key => $val) {
            $url->addToQuery($key, $val);
        }

        return $url;
    }

    /**
     * {@inheritdoc}
     */
    public function getAuthorizationEndpoint()
    {
        return new Uri('https://www.dropbox.com/1/oauth2/authorize');
    }

    /**
     * {@inheritdoc}
     */
    public function getAccessTokenEndpoint()
    {
        return new Uri('https://api.dropbox.com/1/oauth2/token');
    }

    /**
     * {@inheritdoc}
     */
    protected function getAuthorizationMethod()
    {
        return static::AUTHORIZATION_METHOD_QUERY_STRING;
    }

    /**
     * {@inheritdoc}
     */
    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['error'])) {
            throw new TokenResponseException('Error in retrieving token: "' . $data['error'] . '"');
        }

        $token = new StdOAuth2Token();
        $token->setAccessToken($data['access_token']);

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

        unset($data['access_token']);

        $token->setExtraParams($data);

        return $token;
    }
}