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<?php
/*!
* Hybridauth
* https://hybridauth.github.io | https://github.com/hybridauth/hybridauth
*  (c) 2017 Hybridauth authors | https://hybridauth.github.io/license.html
*/

namespace Hybridauth\Provider;

use Hybridauth\Exception\InvalidArgumentException;
use Hybridauth\Exception\UnexpectedApiResponseException;
use Hybridauth\Adapter\OAuth2;
use Hybridauth\Data;
use Hybridauth\User;

/**
 * Facebook OAuth2 provider adapter.
 *
 * Facebook doesn't use standard OAuth refresh tokens.
 * Instead it has a "token exchange" system. You exchange the token prior to
 * expiry, to push back expiry. You start with a short-lived token and each
 * exchange gives you a long-lived one (90 days).
 * We control this with the 'exchange_by_expiry_days' option.
 *
 * Example:
 *
 *   $config = [
 *       'callback' => Hybridauth\HttpClient\Util::getCurrentUrl(),
 *       'keys' => ['id' => '', 'secret' => ''],
 *       'scope' => 'email, user_status, user_posts',
 *       'exchange_by_expiry_days' => 45, // null for no token exchange
 *   ];
 *
 *   $adapter = new Hybridauth\Provider\Facebook($config);
 *
 *   try {
 *       $adapter->authenticate();
 *
 *       $userProfile = $adapter->getUserProfile();
 *       $tokens = $adapter->getAccessToken();
 *       $response = $adapter->setUserStatus("Hybridauth test message..");
 *   } catch (\Exception $e) {
 *       echo $e->getMessage() ;
 *   }
 */
class Facebook extends OAuth2
{
    /**
     * {@inheritdoc}
     */
    protected $scope = 'email, public_profile';

/**
     * {@inheritdoc}
     */
    protected $apiBaseUrl = 'https://graph.facebook.com/v8.0/';

/**
     * {@inheritdoc}
     */
    protected $authorizeUrl = 'https://www.facebook.com/dialog/oauth';

/**
     * {@inheritdoc}
     */
    protected $accessTokenUrl = 'https://graph.facebook.com/oauth/access_token';

/**
     * {@inheritdoc}
     */
    protected $apiDocumentation = 'https://developers.facebook.com/docs/facebook-login/overview';

/**
     * @var string Profile URL template as the fallback when no `link` returned from the API.
     */
    protected $profileUrlTemplate = 'https://www.facebook.com/%s';

/**
     * {@inheritdoc}
     */
    protected function initialize()
    {
        parent::initialize();

// Require proof on all Facebook api calls
        // https://developers.facebook.com/docs/graph-api/securing-requests#appsecret_proof
        if ($accessToken = $this->getStoredData('access_token')) {
            $this->apiRequestParameters['appsecret_proof'] = hash_hmac('sha256', $accessToken, $this->clientSecret);
        }
    }

/**
     * {@inheritdoc}
     */
    public function maintainToken()
    {
        if (!$this->isConnected()) {
            return;
        }

// Handle token exchange prior to the standard handler for an API request
        $exchange_by_expiry_days = $this->config->get('exchange_by_expiry_days') ?: 45;
        if ($exchange_by_expiry_days !== null) {
            $projected_timestamp = time() + 60 * 60 * 24 * $exchange_by_expiry_days;
            if (!$this->hasAccessTokenExpired() && $this->hasAccessTokenExpired($projected_timestamp)) {
                $this->exchangeAccessToken();
            }
        }
    }

/**
     * Exchange the Access Token with one that expires further in the future.
     *
     * @return string Raw Provider API response
     * @throws \Hybridauth\Exception\HttpClientFailureException
     * @throws \Hybridauth\Exception\HttpRequestFailedException
     * @throws \Hybridauth\Exception\InvalidAccessTokenException
     */
    public function exchangeAccessToken()
    {
        $exchangeTokenParameters = [
            'grant_type' => 'fb_exchange_token',
            'client_id' => $this->clientId,
            'client_secret' => $this->clientSecret,
            'fb_exchange_token' => $this->getStoredData('access_token'),
        ];

$response = $this->httpClient->request(
            $this->accessTokenUrl,
            'GET',
            $exchangeTokenParameters
        );

$this->validateApiResponse('Unable to exchange the access token');

$this->validateAccessTokenExchange($response);

return $response;
    }

/**
     * {@inheritdoc}
     */
    public function getUserProfile()
    {
        $fields = [
            'id',
            'name',
            'first_name',
            'last_name',
            'website',
            'locale',
            'about',
            'email',
            'hometown',
            'birthday',
        ];
        
        if (strpos($this->scope, 'user_link') !== false) {
            $fields[] = 'link';
        }

if (strpos($this->scope, 'user_gender') !== false) {
            $fields[] = 'gender';
        }

// Note that en_US is needed for gender fields to match convention.
        $locale = $this->config->get('locale') ?: 'en_US';
        $response = $this->apiRequest('me', 'GET', [
            'fields' => implode(',', $fields),
            'locale' => $locale,
        ]);

$data = new Data\Collection($response);

if (!$data->exists('id')) {
            throw new UnexpectedApiResponseException('Provider API returned an unexpected response.');
        }

$userProfile = new User\Profile();

$userProfile->identifier = $data->get('id');
        $userProfile->displayName = $data->get('name');
        $userProfile->firstName = $data->get('first_name');
        $userProfile->lastName = $data->get('last_name');
        $userProfile->profileURL = $data->get('link');
        $userProfile->webSiteURL = $data->get('website');
        $userProfile->gender = $data->get('gender');
        $userProfile->language = $data->get('locale');
        $userProfile->description = $data->get('about');
        $userProfile->email = $data->get('email');

// Fallback for profile URL in case Facebook does not provide "pretty" link with username (if user set it).
        if (empty($userProfile->profileURL)) {
            $userProfile->profileURL = $this->getProfileUrl($userProfile->identifier);
        }

$userProfile->region = $data->filter('hometown')->get('name');

$photoSize = $this->config->get('photo_size') ?: '150';

$userProfile->photoURL = $this->apiBaseUrl . $userProfile->identifier;
        $userProfile->photoURL .= '/picture?width=' . $photoSize . '&height=' . $photoSize;

$userProfile->emailVerified = $userProfile->email;

$userProfile = $this->fetchUserRegion($userProfile);

$userProfile = $this->fetchBirthday($userProfile, $data->get('birthday'));

return $userProfile;
    }

/**
     * Retrieve the user region.
     *
     * @param User\Profile $userProfile
     *
     * @return \Hybridauth\User\Profile
     */
    protected function fetchUserRegion(User\Profile $userProfile)
    {
        if (!empty($userProfile->region)) {
            $regionArr = explode(',', $userProfile->region);

if (count($regionArr) > 1) {
                $userProfile->city = trim($regionArr[0]);
                $userProfile->country = trim($regionArr[1]);
            }
        }

return $userProfile;
    }

/**
     * Retrieve the user birthday.
     *
     * @param User\Profile $userProfile
     * @param string $birthday
     *
     * @return \Hybridauth\User\Profile
     */
    protected function fetchBirthday(User\Profile $userProfile, $birthday)
    {
        $result = (new Data\Parser())->parseBirthday($birthday);

$userProfile->birthYear = (int)$result[0];
        $userProfile->birthMonth = (int)$result[1];
        $userProfile->birthDay = (int)$result[2];

return $userProfile;
    }

/**
     * /v2.0/me/friends only returns the user's friends who also use the app.
     * In the cases where you want to let people tag their friends in stories published by your app,
     * you can use the Taggable Friends API.
     *
     * https://developers.facebook.com/docs/apps/faq#unable_full_friend_list
     */
    public function getUserContacts()
    {
        $contacts = [];

$apiUrl = 'me/friends?fields=link,name';

do {
            $response = $this->apiRequest($apiUrl);

$data = new Data\Collection($response);

if (!$data->exists('data')) {
                throw new UnexpectedApiResponseException('Provider API returned an unexpected response.');
            }

if (!$data->filter('data')->isEmpty()) {
                foreach ($data->filter('data')->toArray() as $item) {
                    $contacts[] = $this->fetchUserContact($item);
                }
            }

if ($data->filter('paging')->exists('next')) {
                $apiUrl = $data->filter('paging')->get('next');

$pagedList = true;
            } else {
                $pagedList = false;
            }
        } while ($pagedList);

return $contacts;
    }

/**
     * Parse the user contact.
     *
     * @param array $item
     *
     * @return \Hybridauth\User\Contact
     */
    protected function fetchUserContact($item)
    {
        $userContact = new User\Contact();

$item = new Data\Collection($item);

$userContact->identifier = $item->get('id');
        $userContact->displayName = $item->get('name');

$userContact->profileURL = $item->exists('link')
            ?: $this->getProfileUrl($userContact->identifier);

$userContact->photoURL = $this->apiBaseUrl . $userContact->identifier . '/picture?width=150&height=150';

return $userContact;
    }

/**
     * {@inheritdoc}
     */
    public function setPageStatus($status, $pageId)
    {
        $status = is_string($status) ? ['message' => $status] : $status;

// Post on user wall.
        if ($pageId === 'me') {
            return $this->setUserStatus($status);
        }

// Retrieve writable user pages and filter by given one.
        $pages = $this->getUserPages(true);
        $pages = array_filter($pages, function ($page) use ($pageId) {
            return $page->id == $pageId;
        });

if (!$pages) {
            throw new InvalidArgumentException('Could not find a page with given id.');
        }

$page = reset($pages);

// Use page access token instead of user access token.
        $headers = [
            'Authorization' => 'Bearer ' . $page->access_token,
        ];

// Refresh proof for API call.
        $parameters = $status + [
                'appsecret_proof' => hash_hmac('sha256', $page->access_token, $this->clientSecret),
            ];

$response = $this->apiRequest("{$pageId}/feed", 'POST', $parameters, $headers);

return $response;
    }

/**
     * {@inheritdoc}
     */
    public function getUserPages($writable = false)
    {
        $pages = $this->apiRequest('me/accounts');

if (!$writable) {
            return $pages->data;
        }

// Filter user pages by CREATE_CONTENT permission.
        return array_filter($pages->data, function ($page) {
            return in_array('CREATE_CONTENT', $page->tasks);
        });
    }

/**
     * {@inheritdoc}
     */
    public function getUserActivity($stream = 'me')
    {
        $apiUrl = $stream == 'me' ? 'me/feed' : 'me/home';

$response = $this->apiRequest($apiUrl);

$data = new Data\Collection($response);

if (!$data->exists('data')) {
            throw new UnexpectedApiResponseException('Provider API returned an unexpected response.');
        }

$activities = [];

foreach ($data->filter('data')->toArray() as $item) {
            $activities[] = $this->fetchUserActivity($item);
        }

return $activities;
    }

/**
     * @param $item
     *
     * @return User\Activity
     */
    protected function fetchUserActivity($item)
    {
        $userActivity = new User\Activity();

$item = new Data\Collection($item);

$userActivity->id = $item->get('id');
        $userActivity->date = $item->get('created_time');

if ('video' == $item->get('type') || 'link' == $item->get('type')) {
            $userActivity->text = $item->get('link');
        }

if (empty($userActivity->text) && $item->exists('story')) {
            $userActivity->text = $item->get('link');
        }

if (empty($userActivity->text) && $item->exists('message')) {
            $userActivity->text = $item->get('message');
        }

if (!empty($userActivity->text) && $item->exists('from')) {
            $userActivity->user->identifier = $item->filter('from')->get('id');
            $userActivity->user->displayName = $item->filter('from')->get('name');

$userActivity->user->profileURL = $this->getProfileUrl($userActivity->user->identifier);

$userActivity->user->photoURL = $this->apiBaseUrl . $userActivity->user->identifier;
            $userActivity->user->photoURL .= '/picture?width=150&height=150';
        }

return $userActivity;
    }

/**
     * Get profile URL.
     *
     * @param int $identity User ID.
     * @return string|null NULL when identity is not provided.
     */
    protected function getProfileUrl($identity)
    {
        if (!is_numeric($identity)) {
            return null;
        }

return sprintf($this->profileUrlTemplate, $identity);
    }
}

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