/demo-apps/public/sportsnews/ringside/api/clients/facebook.php

<?php

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// | Facebook Platform PHP5 client                                 |

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// | Copyright (c) 2007 Facebook, Inc.                                         |

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// | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR      |

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//



include_once 'ringside/api/clients/facebookapi_php5_restlib.php';



class Facebook {

  public $api_client;



  public $api_key;

  public $secret;



  public $fb_params;

  public $user;


  public function __construct($api_key, $secret, $ringside = null) {

    $this->api_key    = $api_key;

    $this->secret     = $secret;

    $this->api_client = new FacebookRestClient($api_key, $secret);



    $this->validate_fb_params();

    if (isset($this->fb_params['friends'])) {

      $this->api_client->friends_list = explode(',', $this->fb_params['friends']);

    }

    if (isset($this->fb_params['added'])) {

      $this->api_client->added = $this->fb_params['added'];

    }

  }



  public function validate_fb_params() {

    $this->fb_params = $this->get_valid_fb_params($_POST, 48*3600, 'fb_sig');

    if (!$this->fb_params) {

      $this->fb_params = $this->get_valid_fb_params($_GET, 48*3600, 'fb_sig');

    }

    if ($this->fb_params) {

      // If we got any fb_params passed in at all, then either:

      //  - they included an fb_user / fb_session_key, which we should assume to be correct

      //  - they didn't include an fb_user / fb_session_key, which means the user doesn't have a

      //    valid session and if we want to get one we'll need to use require_login().  (Calling

      //    set_user with null values for user/session_key will work properly.)

      // Note that we should *not* use our cookies in this scenario, since they may be referring to

      // the wrong user.

      $user        = isset($this->fb_params['user'])        ? $this->fb_params['user'] : null;

      $session_key = isset($this->fb_params['session_key']) ? $this->fb_params['session_key'] : null;

      $expires     = isset($this->fb_params['expires'])     ? $this->fb_params['expires'] : null;

      $this->set_user($user, $session_key, $expires);

    } else if (!empty($_COOKIE) && $cookies = $this->get_valid_fb_params($_COOKIE, null, $this->api_key)) {

      // use $api_key . '_' as a prefix for the cookies in case there are

      // multiple facebook clients on the same domain.

      $this->set_user($cookies['user'], $cookies['session_key']);

    } else if (isset($_GET['auth_token']) && $session = $this->do_get_session($_GET['auth_token'])) {

      $this->set_user($session['uid'], $session['session_key'], $session['expires']);

    }



    return !empty($this->fb_params);

  }



  public function do_get_session($auth_token) {

    try {

      return $this->api_client->auth_getSession($auth_token);

    } catch (FacebookRestClientException $e) {

      // API_EC_PARAM means we don't have a logged in user, otherwise who

      // knows what it means, so just throw it.

      if ($e->getCode() != FacebookAPIErrorCodes::API_EC_PARAM) {

        throw $e;

      }

    }

  }



  public function redirect($url) {

    if ($this->in_fb_canvas()) {

      echo '<fb:redirect url="' . $url . '"/>';

    } else if (preg_match('/^https?:\/\/([^\/]*\.)?facebook\.com(:\d+)?/i', $url)) {

      // make sure facebook.com url's load in the full frame so that we don't

      // get a frame within a frame.

      echo "<script type=\"text/javascript\">\ntop.location.href = \"$url\";\n</script>";

    } else {

      header('Location: ' . $url);

    }

    exit;

  }



  public function in_frame() {
    return isset($this->fb_params['in_canvas']) || isset($this->fb_params['in_iframe']);

  }

  public function in_fb_canvas() {

    return isset($this->fb_params['in_canvas']);

  }



  public function get_loggedin_user() {

    return $this->user;

  }



  public static function current_url() {

    return 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

  }



  public function require_login() {

    if ($user = $this->get_loggedin_user()) {

      return $user;

    }

    $this->redirect($this->get_login_url(self::current_url(), $this->in_frame()));

  }



  public function require_install() {

    // this was renamed, keeping for compatibility's sake

    return $this->require_add();

  }



  public function require_add() {

    if ($user = $this->get_loggedin_user()) {

      if ($this->fb_params['added']) {

        return $user;

      }

    }

    $this->redirect($this->get_add_url(self::current_url()));

  }



  public function require_frame() {

    if (!$this->in_frame()) {

      $this->redirect($this->get_login_url(self::current_url(), true));

    }

  }



  public static function get_facebook_url($subdomain='www') {
  	if (class_exists('RingsideApiClients')) {
  		$url = RingsideApiClients::get_facebook_url($subdomain);
  		return $url;
  	}

    return 'http://' . $subdomain . '.facebook.com';

  }



  public function get_install_url($next=null) {

    // this was renamed, keeping for compatibility's sake

    return $this->get_add_url($next);

  }



  public function get_add_url($next=null) {

    return self::get_facebook_url().'/add.php?api_key='.$this->api_key .

      ($next ? '&next=' . urlencode($next) : '');

  }



  public function get_login_url($next, $canvas) {

    return self::get_facebook_url().'/login.php?v=1.0&api_key=' . $this->api_key .

      ($next ? '&next=' . urlencode($next)  : '') .

      ($canvas ? '&canvas' : '');

  }



  public static function generate_sig($params_array, $secret) {

    $str = '';



    ksort($params_array);

    // Note: make sure that the signature parameter is not already included in

    //       $params_array.

    foreach ($params_array as $k=>$v) {

      $str .= "$k=$v";

    }

    $str .= $secret;



    return md5($str);

  }



  public function set_user($user, $session_key, $expires=null) {

    if (!$this->in_fb_canvas() && (!isset($_COOKIE[$this->api_key . '_user'])

                                   || $_COOKIE[$this->api_key . '_user'] != $user)) {

      $cookies = array();

      $cookies['user'] = $user;

      $cookies['session_key'] = $session_key;

      $sig = self::generate_sig($cookies, $this->secret);

      foreach ($cookies as $name => $val) {

        setcookie($this->api_key . '_' . $name, $val, (int)$expires);

        $_COOKIE[$this->api_key . '_' . $name] = $val;

      }

      setcookie($this->api_key, $sig, (int)$expires);

      $_COOKIE[$this->api_key] = $sig;

    }

    $this->user = $user;

    $this->api_client->session_key = $session_key;

  }



  /**

   * Tries to undo the badness of magic quotes as best we can

   * @param     string   $val   Should come directly from $_GET, $_POST, etc.

   * @return    string   val without added slashes

   */

  public static function no_magic_quotes($val) {

    if (get_magic_quotes_gpc()) {

      return stripslashes($val);

    } else {

      return $val;

    }

  }



  public function get_valid_fb_params($params, $timeout=null, $namespace='fb_sig') {

    $prefix = $namespace . '_';

    $prefix_len = strlen($prefix);

    $fb_params = array();

    foreach ($params as $name => $val) {

      if (strpos($name, $prefix) === 0) {

        $fb_params[substr($name, $prefix_len)] = self::no_magic_quotes($val);

      }

    }

    if ($timeout && (!isset($fb_params['time']) || time() - $fb_params['time'] > $timeout)) {

      return array();

    }

    if (!isset($params[$namespace]) || !$this->verify_signature($fb_params, $params[$namespace])) {

      return array();

    }

    return $fb_params;

  }



  public function verify_signature($fb_params, $expected_sig) {

    return self::generate_sig($fb_params, $this->secret) == $expected_sig;

  }

}



?>