<?php

/*
 * This file is part of Phraseanet
 *
 * (c) 2005-2016 Alchemy
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Alchemy\Phrasea\Authentication\Provider;

use Alchemy\Phrasea\Authentication\Provider\Token\Token;
use Alchemy\Phrasea\Authentication\Provider\Token\Identity;
use Alchemy\Phrasea\Authentication\Exception\NotAuthenticatedException;
use Guzzle\Http\Client as Guzzle;
use Guzzle\Http\ClientInterface;
use Guzzle\Common\Exception\GuzzleException;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\Routing\Generator\UrlGenerator;
use Symfony\Component\HttpFoundation\Session\SessionInterface;

class Github extends AbstractProvider
{
    private $client;

    private $key;
    private $secret;

    public function __construct(UrlGenerator $generator, SessionInterface $session, ClientInterface $client, $key, $secret)
    {
        $this->generator = $generator;
        $this->session = $session;
        $this->client = $client;

        $this->key = $key;
        $this->secret = $secret;
    }

    /**
     * @param ClientInterface $client
     *
     * @return Github
     */
    public function setGuzzleClient(ClientInterface $client)
    {
        $this->client = $client;

        return $this;
    }

    /**
     * @return ClientInterface
     */
    public function getGuzzleClient()
    {
        return $this->client;
    }

    /**
     * {@inheritdoc}
     */
    public function getId()
    {
        return 'github';
    }

    /**
     * {@inheritdoc}
     */
    public function getName()
    {
        return 'Github';
    }

    /**
     * {@inheritdoc}
     */
    public function authenticate(array $params = array())
    {
        $params = array_merge(['providerId' => $this->getId()], $params);

        $state = $this->createState();

        $this->session->set('github.provider.state', $state);

        return new RedirectResponse('https://github.com/login/oauth/authorize?' . http_build_query([
            'client_id' => $this->key,
            'scope' => 'user,user:email',
            'state' => $state,
            'redirect_uri' => $this->generator->generate(
                'login_authentication_provider_callback',
                $params,
                UrlGenerator::ABSOLUTE_URL
            ),
        ], '', '&'));
    }

    /**
     * {@inheritdoc}
     */
    public function logout()
    {
        // GitHub does not support tokens revocation
    }

    /**
     * {@inheritdoc}
     */
    public function onCallback(Request $request)
    {
        if (!$this->session->has('github.provider.state')) {
            throw new NotAuthenticatedException('No state value in session ; CSRF try ?');
        }

        if ($request->query->get('state') !== $this->session->remove('github.provider.state')) {
            throw new NotAuthenticatedException('Invalid state value ; CSRF try ?');
        }

        try {
            $guzzleRequest = $this->client->post('access_token');

            $guzzleRequest->addPostFields([
                'code' => $request->query->get('code'),
                'redirect_uri' => $this->generator->generate(
                    'login_authentication_provider_callback',
                    ['providerId' => $this->getId()],
                    UrlGenerator::ABSOLUTE_URL
                ),
                'client_id' => $this->key,
                'client_secret' => $this->secret,
            ]);
            $guzzleRequest->setHeader('Accept', 'application/json');
            $response = $guzzleRequest->send();
        } catch (GuzzleException $e) {
            throw new NotAuthenticatedException('Guzzle error while authentication', $e->getCode(), $e);
        }

        if (200 !== $response->getStatusCode()) {
            throw new NotAuthenticatedException('Error while getting access_token');
        }

        $data = @json_decode($response->getBody(true), true);

        if (JSON_ERROR_NONE !== json_last_error()) {
            throw new NotAuthenticatedException('Error while retrieving user info, unable to parse JSON.');
        }

        $this->session->remove('github.provider.state');
        $this->session->set('github.provider.access_token', $data['access_token']);

        try {
            $request = $this->client->get('https://api.github.com/user');
            $request->getQuery()->add('access_token', $data['access_token']);
            $request->setHeader('Accept', 'application/json');

            $response = $request->send();
        } catch (GuzzleException $e) {
            throw new NotAuthenticatedException('Guzzle error while authentication', $e->getCode(), $e);
        }

        $data = @json_decode($response->getBody(true), true);

        if (200 !== $response->getStatusCode()) {
            throw new NotAuthenticatedException('Error while retrieving user info, invalid status code.');
        }

        if (JSON_ERROR_NONE !== json_last_error()) {
            throw new NotAuthenticatedException('Error while retrieving user info, unable to parse JSON.');
        }

        $this->session->set('github.provider.id', $data['id']);
    }

    /**
     * {@inheritdoc}
     */
    public function getToken()
    {
        if ('' === trim($this->session->get('github.provider.id'))) {
            throw new NotAuthenticatedException('Github has not authenticated');
        }

        return new Token($this, $this->session->get('github.provider.id'));
    }

    /**
     * {@inheritdoc}
     */
    public function getIdentity()
    {
        $identity = new Identity();

        try {
            $request = $this->client->get('https://api.github.com/user');
            $request->getQuery()->add('access_token', $this->session->get('github.provider.access_token'));
            $request->setHeader('Accept', 'application/json');

            $response = $request->send();
        } catch (GuzzleException $e) {
            throw new NotAuthenticatedException('Error while retrieving user info', $e->getCode(), $e);
        }

        if (200 !== $response->getStatusCode()) {
            throw new NotAuthenticatedException('Error while retrieving user info');
        }

        $data = @json_decode($response->getBody(true), true);

        if (JSON_ERROR_NONE !== json_last_error()) {
            throw new NotAuthenticatedException('Error while parsing json');
        }

        list($firstname, $lastname) = explode(' ', $data['name'], 2);

        $identity->set(Identity::PROPERTY_EMAIL, $data['email']);
        $identity->set(Identity::PROPERTY_FIRSTNAME, $firstname);
        $identity->set(Identity::PROPERTY_ID, $data['id']);
        $identity->set(Identity::PROPERTY_IMAGEURL, $data['avatar_url']);
        $identity->set(Identity::PROPERTY_LASTNAME, $lastname);

        return $identity;
    }

    /**
     * {@inheritdoc}
     */
    public function getIconURI()
    {
        return 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADEAAAAwCAYAAAC4w'
        . 'JK5AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA2hpVFh0WE1MO'
        . 'mNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ'
        . '2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6b'
        . 'WV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuMy1jMDExIDY2LjE0NTY2MSwgM'
        . 'jAxMi8wMi8wNi0xNDo1NjoyNyAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJod'
        . 'HRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZ'
        . 'XNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZ'
        . 'S5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL'
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        . 'cLdbQhG+vljIuUM7N04F+nN2lanko0pF9tdC6aIlMlERbjXi3OSsaTIpiuAbaVY2HIZs'
        . 'y12smVJ9LB4ZqUFZfnE1mpsWxLQ2sLria5BaBobG8rIh3tZM4pqleoddG9N9S/k26JY7'
        . 'rT+dvJUXJNaXSFR3M9hpdbK/pSq6nfHTpw4RWvlYnGzHow+7OCXeP2JhhD5cOrMNS7oX'
        . 'vBZywvJVnnxb4nKiUqJXhHVSO0GNEH3lv61fK3OSkGo5DXWymtuNfhZhLxoZ5kc5WvW8'
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        . 'ElFTkSuQmCC';
    }

    /**
     * {@inheritdoc}
     */
    public static function create(UrlGenerator $generator, SessionInterface $session, array $options)
    {
        if (!isset($options['client-id'])) {
            throw new InvalidArgumentException('Missing GitHub client-id parameter');
        }

        if (!isset($options['client-secret'])) {
            throw new InvalidArgumentException('Missing GitHub client-secret parameter');
        }

        return new Github($generator, $session, new Guzzle('https://github.com/login/oauth'), $options['client-id'], $options['client-secret']);
    }
}
