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External login : facebook module

Noel Dieschburg 13 rokov pred
rodič
commit
d9040bafe9

+ 1269 - 0
main/auth/external_login/facebook-php-sdk/src/base_facebook.php

@@ -0,0 +1,1269 @@
+<?php
+/**
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+if (!function_exists('curl_init')) {
+  throw new Exception('Facebook needs the CURL PHP extension.');
+}
+if (!function_exists('json_decode')) {
+  throw new Exception('Facebook needs the JSON PHP extension.');
+}
+
+/**
+ * Thrown when an API call returns an exception.
+ *
+ * @author Naitik Shah <naitik@facebook.com>
+ */
+class FacebookApiException extends Exception
+{
+  /**
+   * The result from the API server that represents the exception information.
+   */
+  protected $result;
+
+  /**
+   * Make a new API Exception with the given result.
+   *
+   * @param array $result The result from the API server
+   */
+  public function __construct($result) {
+    $this->result = $result;
+
+    $code = isset($result['error_code']) ? $result['error_code'] : 0;
+
+    if (isset($result['error_description'])) {
+      // OAuth 2.0 Draft 10 style
+      $msg = $result['error_description'];
+    } else if (isset($result['error']) && is_array($result['error'])) {
+      // OAuth 2.0 Draft 00 style
+      $msg = $result['error']['message'];
+    } else if (isset($result['error_msg'])) {
+      // Rest server style
+      $msg = $result['error_msg'];
+    } else {
+      $msg = 'Unknown Error. Check getResult()';
+    }
+
+    parent::__construct($msg, $code);
+  }
+
+  /**
+   * Return the associated result object returned by the API server.
+   *
+   * @return array The result from the API server
+   */
+  public function getResult() {
+    return $this->result;
+  }
+
+  /**
+   * Returns the associated type for the error. This will default to
+   * 'Exception' when a type is not available.
+   *
+   * @return string
+   */
+  public function getType() {
+    if (isset($this->result['error'])) {
+      $error = $this->result['error'];
+      if (is_string($error)) {
+        // OAuth 2.0 Draft 10 style
+        return $error;
+      } else if (is_array($error)) {
+        // OAuth 2.0 Draft 00 style
+        if (isset($error['type'])) {
+          return $error['type'];
+        }
+      }
+    }
+
+    return 'Exception';
+  }
+
+  /**
+   * To make debugging easier.
+   *
+   * @return string The string representation of the error
+   */
+  public function __toString() {
+    $str = $this->getType() . ': ';
+    if ($this->code != 0) {
+      $str .= $this->code . ': ';
+    }
+    return $str . $this->message;
+  }
+}
+
+/**
+ * Provides access to the Facebook Platform.  This class provides
+ * a majority of the functionality needed, but the class is abstract
+ * because it is designed to be sub-classed.  The subclass must
+ * implement the four abstract methods listed at the bottom of
+ * the file.
+ *
+ * @author Naitik Shah <naitik@facebook.com>
+ */
+abstract class BaseFacebook
+{
+  /**
+   * Version.
+   */
+  const VERSION = '3.1.1';
+
+  /**
+   * Default options for curl.
+   */
+  public static $CURL_OPTS = array(
+    CURLOPT_CONNECTTIMEOUT => 10,
+    CURLOPT_RETURNTRANSFER => true,
+    CURLOPT_TIMEOUT        => 60,
+    CURLOPT_USERAGENT      => 'facebook-php-3.1',
+  );
+
+  /**
+   * List of query parameters that get automatically dropped when rebuilding
+   * the current URL.
+   */
+  protected static $DROP_QUERY_PARAMS = array(
+    'code',
+    'state',
+    'signed_request',
+  );
+
+  /**
+   * Maps aliases to Facebook domains.
+   */
+  public static $DOMAIN_MAP = array(
+    'api'       => 'https://api.facebook.com/',
+    'api_video' => 'https://api-video.facebook.com/',
+    'api_read'  => 'https://api-read.facebook.com/',
+    'graph'     => 'https://graph.facebook.com/',
+    'graph_video' => 'https://graph-video.facebook.com/',
+    'www'       => 'https://www.facebook.com/',
+  );
+
+  /**
+   * The Application ID.
+   *
+   * @var string
+   */
+  protected $appId;
+
+  /**
+   * The Application App Secret.
+   *
+   * @var string
+   */
+  protected $appSecret;
+
+  /**
+   * The ID of the Facebook user, or 0 if the user is logged out.
+   *
+   * @var integer
+   */
+  protected $user;
+
+  /**
+   * The data from the signed_request token.
+   */
+  protected $signedRequest;
+
+  /**
+   * A CSRF state variable to assist in the defense against CSRF attacks.
+   */
+  protected $state;
+
+  /**
+   * The OAuth access token received in exchange for a valid authorization
+   * code.  null means the access token has yet to be determined.
+   *
+   * @var string
+   */
+  protected $accessToken = null;
+
+  /**
+   * Indicates if the CURL based @ syntax for file uploads is enabled.
+   *
+   * @var boolean
+   */
+  protected $fileUploadSupport = false;
+
+  /**
+   * Initialize a Facebook Application.
+   *
+   * The configuration:
+   * - appId: the application ID
+   * - secret: the application secret
+   * - fileUpload: (optional) boolean indicating if file uploads are enabled
+   *
+   * @param array $config The application configuration
+   */
+  public function __construct($config) {
+    $this->setAppId($config['appId']);
+    $this->setAppSecret($config['secret']);
+    if (isset($config['fileUpload'])) {
+      $this->setFileUploadSupport($config['fileUpload']);
+    }
+
+    $state = $this->getPersistentData('state');
+    if (!empty($state)) {
+      $this->state = $this->getPersistentData('state');
+    }
+  }
+
+  /**
+   * Set the Application ID.
+   *
+   * @param string $appId The Application ID
+   * @return BaseFacebook
+   */
+  public function setAppId($appId) {
+    $this->appId = $appId;
+    return $this;
+  }
+
+  /**
+   * Get the Application ID.
+   *
+   * @return string the Application ID
+   */
+  public function getAppId() {
+    return $this->appId;
+  }
+
+  /**
+   * Set the App Secret.
+   *
+   * @param string $apiSecret The App Secret
+   * @return BaseFacebook
+   * @deprecated
+   */
+  public function setApiSecret($apiSecret) {
+    $this->setAppSecret($apiSecret);
+    return $this;
+  }
+
+  /**
+   * Set the App Secret.
+   *
+   * @param string $appSecret The App Secret
+   * @return BaseFacebook
+   */
+  public function setAppSecret($appSecret) {
+    $this->appSecret = $appSecret;
+    return $this;
+  }
+
+  /**
+   * Get the App Secret.
+   *
+   * @return string the App Secret
+   * @deprecated
+   */
+  public function getApiSecret() {
+    return $this->getAppSecret();
+  }
+
+  /**
+   * Get the App Secret.
+   *
+   * @return string the App Secret
+   */
+  public function getAppSecret() {
+    return $this->appSecret;
+  }
+
+  /**
+   * Set the file upload support status.
+   *
+   * @param boolean $fileUploadSupport The file upload support status.
+   * @return BaseFacebook
+   */
+  public function setFileUploadSupport($fileUploadSupport) {
+    $this->fileUploadSupport = $fileUploadSupport;
+    return $this;
+  }
+
+  /**
+   * Get the file upload support status.
+   *
+   * @return boolean true if and only if the server supports file upload.
+   */
+  public function getFileUploadSupport() {
+    return $this->fileUploadSupport;
+  }
+
+  /**
+   * DEPRECATED! Please use getFileUploadSupport instead.
+   *
+   * Get the file upload support status.
+   *
+   * @return boolean true if and only if the server supports file upload.
+   */
+  public function useFileUploadSupport() {
+    return $this->getFileUploadSupport();
+  }
+
+  /**
+   * Sets the access token for api calls.  Use this if you get
+   * your access token by other means and just want the SDK
+   * to use it.
+   *
+   * @param string $access_token an access token.
+   * @return BaseFacebook
+   */
+  public function setAccessToken($access_token) {
+    $this->accessToken = $access_token;
+    return $this;
+  }
+
+  /**
+   * Determines the access token that should be used for API calls.
+   * The first time this is called, $this->accessToken is set equal
+   * to either a valid user access token, or it's set to the application
+   * access token if a valid user access token wasn't available.  Subsequent
+   * calls return whatever the first call returned.
+   *
+   * @return string The access token
+   */
+  public function getAccessToken() {
+    if ($this->accessToken !== null) {
+      // we've done this already and cached it.  Just return.
+      return $this->accessToken;
+    }
+
+    // first establish access token to be the application
+    // access token, in case we navigate to the /oauth/access_token
+    // endpoint, where SOME access token is required.
+    $this->setAccessToken($this->getApplicationAccessToken());
+    $user_access_token = $this->getUserAccessToken();
+    if ($user_access_token) {
+      $this->setAccessToken($user_access_token);
+    }
+
+    return $this->accessToken;
+  }
+
+  /**
+   * Determines and returns the user access token, first using
+   * the signed request if present, and then falling back on
+   * the authorization code if present.  The intent is to
+   * return a valid user access token, or false if one is determined
+   * to not be available.
+   *
+   * @return string A valid user access token, or false if one
+   *                could not be determined.
+   */
+  protected function getUserAccessToken() {
+    // first, consider a signed request if it's supplied.
+    // if there is a signed request, then it alone determines
+    // the access token.
+    $signed_request = $this->getSignedRequest();
+    if ($signed_request) {
+      // apps.facebook.com hands the access_token in the signed_request
+      if (array_key_exists('oauth_token', $signed_request)) {
+        $access_token = $signed_request['oauth_token'];
+        $this->setPersistentData('access_token', $access_token);
+        return $access_token;
+      }
+
+      // the JS SDK puts a code in with the redirect_uri of ''
+      if (array_key_exists('code', $signed_request)) {
+        $code = $signed_request['code'];
+        $access_token = $this->getAccessTokenFromCode($code, '');
+        if ($access_token) {
+          $this->setPersistentData('code', $code);
+          $this->setPersistentData('access_token', $access_token);
+          return $access_token;
+        }
+      }
+
+      // signed request states there's no access token, so anything
+      // stored should be cleared.
+      $this->clearAllPersistentData();
+      return false; // respect the signed request's data, even
+                    // if there's an authorization code or something else
+    }
+
+    $code = $this->getCode();
+    if ($code && $code != $this->getPersistentData('code')) {
+      $access_token = $this->getAccessTokenFromCode($code);
+      if ($access_token) {
+        $this->setPersistentData('code', $code);
+        $this->setPersistentData('access_token', $access_token);
+        return $access_token;
+      }
+
+      // code was bogus, so everything based on it should be invalidated.
+      $this->clearAllPersistentData();
+      return false;
+    }
+
+    // as a fallback, just return whatever is in the persistent
+    // store, knowing nothing explicit (signed request, authorization
+    // code, etc.) was present to shadow it (or we saw a code in $_REQUEST,
+    // but it's the same as what's in the persistent store)
+    return $this->getPersistentData('access_token');
+  }
+
+  /**
+   * Retrieve the signed request, either from a request parameter or,
+   * if not present, from a cookie.
+   *
+   * @return string the signed request, if available, or null otherwise.
+   */
+  public function getSignedRequest() {
+    if (!$this->signedRequest) {
+      if (isset($_REQUEST['signed_request'])) {
+        $this->signedRequest = $this->parseSignedRequest(
+          $_REQUEST['signed_request']);
+      } else if (isset($_COOKIE[$this->getSignedRequestCookieName()])) {
+        $this->signedRequest = $this->parseSignedRequest(
+          $_COOKIE[$this->getSignedRequestCookieName()]);
+      }
+    }
+    return $this->signedRequest;
+  }
+
+  /**
+   * Get the UID of the connected user, or 0
+   * if the Facebook user is not connected.
+   *
+   * @return string the UID if available.
+   */
+  public function getUser() {
+    if ($this->user !== null) {
+      // we've already determined this and cached the value.
+      return $this->user;
+    }
+
+    return $this->user = $this->getUserFromAvailableData();
+  }
+
+  /**
+   * Determines the connected user by first examining any signed
+   * requests, then considering an authorization code, and then
+   * falling back to any persistent store storing the user.
+   *
+   * @return integer The id of the connected Facebook user,
+   *                 or 0 if no such user exists.
+   */
+  protected function getUserFromAvailableData() {
+    // if a signed request is supplied, then it solely determines
+    // who the user is.
+    $signed_request = $this->getSignedRequest();
+    if ($signed_request) {
+      if (array_key_exists('user_id', $signed_request)) {
+        $user = $signed_request['user_id'];
+        $this->setPersistentData('user_id', $signed_request['user_id']);
+        return $user;
+      }
+
+      // if the signed request didn't present a user id, then invalidate
+      // all entries in any persistent store.
+      $this->clearAllPersistentData();
+      return 0;
+    }
+
+    $user = $this->getPersistentData('user_id', $default = 0);
+    $persisted_access_token = $this->getPersistentData('access_token');
+
+    // use access_token to fetch user id if we have a user access_token, or if
+    // the cached access token has changed.
+    $access_token = $this->getAccessToken();
+    if ($access_token &&
+        $access_token != $this->getApplicationAccessToken() &&
+        !($user && $persisted_access_token == $access_token)) {
+      $user = $this->getUserFromAccessToken();
+      if ($user) {
+        $this->setPersistentData('user_id', $user);
+      } else {
+        $this->clearAllPersistentData();
+      }
+    }
+
+    return $user;
+  }
+
+  /**
+   * Get a Login URL for use with redirects. By default, full page redirect is
+   * assumed. If you are using the generated URL with a window.open() call in
+   * JavaScript, you can pass in display=popup as part of the $params.
+   *
+   * The parameters:
+   * - redirect_uri: the url to go to after a successful login
+   * - scope: comma separated list of requested extended perms
+   *
+   * @param array $params Provide custom parameters
+   * @return string The URL for the login flow
+   */
+  public function getLoginUrl($params=array()) {
+    $this->establishCSRFTokenState();
+    $currentUrl = $this->getCurrentUrl();
+
+    // if 'scope' is passed as an array, convert to comma separated list
+    $scopeParams = isset($params['scope']) ? $params['scope'] : null;
+    if ($scopeParams && is_array($scopeParams)) {
+      $params['scope'] = implode(',', $scopeParams);
+    }
+
+    return $this->getUrl(
+      'www',
+      'dialog/oauth',
+      array_merge(array(
+                    'client_id' => $this->getAppId(),
+                    'redirect_uri' => $currentUrl, // possibly overwritten
+                    'state' => $this->state),
+                  $params));
+  }
+
+  /**
+   * Get a Logout URL suitable for use with redirects.
+   *
+   * The parameters:
+   * - next: the url to go to after a successful logout
+   *
+   * @param array $params Provide custom parameters
+   * @return string The URL for the logout flow
+   */
+  public function getLogoutUrl($params=array()) {
+    return $this->getUrl(
+      'www',
+      'logout.php',
+      array_merge(array(
+        'next' => $this->getCurrentUrl(),
+        'access_token' => $this->getAccessToken(),
+      ), $params)
+    );
+  }
+
+  /**
+   * Get a login status URL to fetch the status from Facebook.
+   *
+   * The parameters:
+   * - ok_session: the URL to go to if a session is found
+   * - no_session: the URL to go to if the user is not connected
+   * - no_user: the URL to go to if the user is not signed into facebook
+   *
+   * @param array $params Provide custom parameters
+   * @return string The URL for the logout flow
+   */
+  public function getLoginStatusUrl($params=array()) {
+    return $this->getUrl(
+      'www',
+      'extern/login_status.php',
+      array_merge(array(
+        'api_key' => $this->getAppId(),
+        'no_session' => $this->getCurrentUrl(),
+        'no_user' => $this->getCurrentUrl(),
+        'ok_session' => $this->getCurrentUrl(),
+        'session_version' => 3,
+      ), $params)
+    );
+  }
+
+  /**
+   * Make an API call.
+   *
+   * @return mixed The decoded response
+   */
+  public function api(/* polymorphic */) {
+    $args = func_get_args();
+    if (is_array($args[0])) {
+      return $this->_restserver($args[0]);
+    } else {
+      return call_user_func_array(array($this, '_graph'), $args);
+    }
+  }
+
+  /**
+   * Constructs and returns the name of the cookie that
+   * potentially houses the signed request for the app user.
+   * The cookie is not set by the BaseFacebook class, but
+   * it may be set by the JavaScript SDK.
+   *
+   * @return string the name of the cookie that would house
+   *         the signed request value.
+   */
+  protected function getSignedRequestCookieName() {
+    return 'fbsr_'.$this->getAppId();
+  }
+
+  /**
+   * Constructs and returns the name of the coookie that potentially contain
+   * metadata. The cookie is not set by the BaseFacebook class, but it may be
+   * set by the JavaScript SDK.
+   *
+   * @return string the name of the cookie that would house metadata.
+   */
+  protected function getMetadataCookieName() {
+    return 'fbm_'.$this->getAppId();
+  }
+
+  /**
+   * Get the authorization code from the query parameters, if it exists,
+   * and otherwise return false to signal no authorization code was
+   * discoverable.
+   *
+   * @return mixed The authorization code, or false if the authorization
+   *               code could not be determined.
+   */
+  protected function getCode() {
+    if (isset($_REQUEST['code'])) {
+      if ($this->state !== null &&
+          isset($_REQUEST['state']) &&
+          $this->state === $_REQUEST['state']) {
+
+        // CSRF state has done its job, so clear it
+        $this->state = null;
+        $this->clearPersistentData('state');
+        return $_REQUEST['code'];
+      } else {
+        self::errorLog('CSRF state token does not match one provided.');
+        return false;
+      }
+    }
+
+    return false;
+  }
+
+  /**
+   * Retrieves the UID with the understanding that
+   * $this->accessToken has already been set and is
+   * seemingly legitimate.  It relies on Facebook's Graph API
+   * to retrieve user information and then extract
+   * the user ID.
+   *
+   * @return integer Returns the UID of the Facebook user, or 0
+   *                 if the Facebook user could not be determined.
+   */
+  protected function getUserFromAccessToken() {
+    try {
+      $user_info = $this->api('/me');
+      return $user_info['id'];
+    } catch (FacebookApiException $e) {
+      return 0;
+    }
+  }
+
+  /**
+   * Returns the access token that should be used for logged out
+   * users when no authorization code is available.
+   *
+   * @return string The application access token, useful for gathering
+   *                public information about users and applications.
+   */
+  protected function getApplicationAccessToken() {
+    return $this->appId.'|'.$this->appSecret;
+  }
+
+  /**
+   * Lays down a CSRF state token for this process.
+   *
+   * @return void
+   */
+  protected function establishCSRFTokenState() {
+    if ($this->state === null) {
+      $this->state = md5(uniqid(mt_rand(), true));
+      $this->setPersistentData('state', $this->state);
+    }
+  }
+
+  /**
+   * Retrieves an access token for the given authorization code
+   * (previously generated from www.facebook.com on behalf of
+   * a specific user).  The authorization code is sent to graph.facebook.com
+   * and a legitimate access token is generated provided the access token
+   * and the user for which it was generated all match, and the user is
+   * either logged in to Facebook or has granted an offline access permission.
+   *
+   * @param string $code An authorization code.
+   * @return mixed An access token exchanged for the authorization code, or
+   *               false if an access token could not be generated.
+   */
+  protected function getAccessTokenFromCode($code, $redirect_uri = null) {
+    if (empty($code)) {
+      return false;
+    }
+
+    if ($redirect_uri === null) {
+      $redirect_uri = $this->getCurrentUrl();
+    }
+
+    try {
+      // need to circumvent json_decode by calling _oauthRequest
+      // directly, since response isn't JSON format.
+      $access_token_response =
+        $this->_oauthRequest(
+          $this->getUrl('graph', '/oauth/access_token'),
+          $params = array('client_id' => $this->getAppId(),
+                          'client_secret' => $this->getAppSecret(),
+                          'redirect_uri' => $redirect_uri,
+                          'code' => $code));
+    } catch (FacebookApiException $e) {
+      // most likely that user very recently revoked authorization.
+      // In any event, we don't have an access token, so say so.
+      return false;
+    }
+
+    if (empty($access_token_response)) {
+      return false;
+    }
+
+    $response_params = array();
+    parse_str($access_token_response, $response_params);
+    if (!isset($response_params['access_token'])) {
+      return false;
+    }
+
+    return $response_params['access_token'];
+  }
+
+  /**
+   * Invoke the old restserver.php endpoint.
+   *
+   * @param array $params Method call object
+   *
+   * @return mixed The decoded response object
+   * @throws FacebookApiException
+   */
+  protected function _restserver($params) {
+    // generic application level parameters
+    $params['api_key'] = $this->getAppId();
+    $params['format'] = 'json-strings';
+
+    $result = json_decode($this->_oauthRequest(
+      $this->getApiUrl($params['method']),
+      $params
+    ), true);
+
+    // results are returned, errors are thrown
+    if (is_array($result) && isset($result['error_code'])) {
+      $this->throwAPIException($result);
+    }
+
+    if ($params['method'] === 'auth.expireSession' ||
+        $params['method'] === 'auth.revokeAuthorization') {
+      $this->destroySession();
+    }
+
+    return $result;
+  }
+
+  /**
+   * Return true if this is video post.
+   *
+   * @param string $path The path
+   * @param string $method The http method (default 'GET')
+   *
+   * @return boolean true if this is video post
+   */
+  protected function isVideoPost($path, $method = 'GET') {
+    if ($method == 'POST' && preg_match("/^(\/)(.+)(\/)(videos)$/", $path)) {
+      return true;
+    }
+    return false;
+  }
+
+  /**
+   * Invoke the Graph API.
+   *
+   * @param string $path The path (required)
+   * @param string $method The http method (default 'GET')
+   * @param array $params The query/post data
+   *
+   * @return mixed The decoded response object
+   * @throws FacebookApiException
+   */
+  protected function _graph($path, $method = 'GET', $params = array()) {
+    if (is_array($method) && empty($params)) {
+      $params = $method;
+      $method = 'GET';
+    }
+    $params['method'] = $method; // method override as we always do a POST
+
+    if ($this->isVideoPost($path, $method)) {
+      $domainKey = 'graph_video';
+    } else {
+      $domainKey = 'graph';
+    }
+
+    $result = json_decode($this->_oauthRequest(
+      $this->getUrl($domainKey, $path),
+      $params
+    ), true);
+
+    // results are returned, errors are thrown
+    if (is_array($result) && isset($result['error'])) {
+      $this->throwAPIException($result);
+    }
+
+    return $result;
+  }
+
+  /**
+   * Make a OAuth Request.
+   *
+   * @param string $url The path (required)
+   * @param array $params The query/post data
+   *
+   * @return string The decoded response object
+   * @throws FacebookApiException
+   */
+  protected function _oauthRequest($url, $params) {
+    if (!isset($params['access_token'])) {
+      $params['access_token'] = $this->getAccessToken();
+    }
+
+    // json_encode all params values that are not strings
+    foreach ($params as $key => $value) {
+      if (!is_string($value)) {
+        $params[$key] = json_encode($value);
+      }
+    }
+
+    return $this->makeRequest($url, $params);
+  }
+
+  /**
+   * Makes an HTTP request. This method can be overridden by subclasses if
+   * developers want to do fancier things or use something other than curl to
+   * make the request.
+   *
+   * @param string $url The URL to make the request to
+   * @param array $params The parameters to use for the POST body
+   * @param CurlHandler $ch Initialized curl handle
+   *
+   * @return string The response text
+   */
+  protected function makeRequest($url, $params, $ch=null) {
+    if (!$ch) {
+      $ch = curl_init();
+    }
+
+    $opts = self::$CURL_OPTS;
+    if ($this->getFileUploadSupport()) {
+      $opts[CURLOPT_POSTFIELDS] = $params;
+    } else {
+      $opts[CURLOPT_POSTFIELDS] = http_build_query($params, null, '&');
+    }
+    $opts[CURLOPT_URL] = $url;
+
+    // disable the 'Expect: 100-continue' behaviour. This causes CURL to wait
+    // for 2 seconds if the server does not support this header.
+    if (isset($opts[CURLOPT_HTTPHEADER])) {
+      $existing_headers = $opts[CURLOPT_HTTPHEADER];
+      $existing_headers[] = 'Expect:';
+      $opts[CURLOPT_HTTPHEADER] = $existing_headers;
+    } else {
+      $opts[CURLOPT_HTTPHEADER] = array('Expect:');
+    }
+
+    curl_setopt_array($ch, $opts);
+    $result = curl_exec($ch);
+
+    if (curl_errno($ch) == 60) { // CURLE_SSL_CACERT
+      self::errorLog('Invalid or no certificate authority found, '.
+                     'using bundled information');
+      curl_setopt($ch, CURLOPT_CAINFO,
+                  dirname(__FILE__) . '/fb_ca_chain_bundle.crt');
+      $result = curl_exec($ch);
+    }
+
+    if ($result === false) {
+      $e = new FacebookApiException(array(
+        'error_code' => curl_errno($ch),
+        'error' => array(
+        'message' => curl_error($ch),
+        'type' => 'CurlException',
+        ),
+      ));
+      curl_close($ch);
+      throw $e;
+    }
+    curl_close($ch);
+    return $result;
+  }
+
+  /**
+   * Parses a signed_request and validates the signature.
+   *
+   * @param string $signed_request A signed token
+   * @return array The payload inside it or null if the sig is wrong
+   */
+  protected function parseSignedRequest($signed_request) {
+    list($encoded_sig, $payload) = explode('.', $signed_request, 2);
+
+    // decode the data
+    $sig = self::base64UrlDecode($encoded_sig);
+    $data = json_decode(self::base64UrlDecode($payload), true);
+
+    if (strtoupper($data['algorithm']) !== 'HMAC-SHA256') {
+      self::errorLog('Unknown algorithm. Expected HMAC-SHA256');
+      return null;
+    }
+
+    // check sig
+    $expected_sig = hash_hmac('sha256', $payload,
+                              $this->getAppSecret(), $raw = true);
+    if ($sig !== $expected_sig) {
+      self::errorLog('Bad Signed JSON signature!');
+      return null;
+    }
+
+    return $data;
+  }
+
+  /**
+   * Build the URL for api given parameters.
+   *
+   * @param $method String the method name.
+   * @return string The URL for the given parameters
+   */
+  protected function getApiUrl($method) {
+    static $READ_ONLY_CALLS =
+      array('admin.getallocation' => 1,
+            'admin.getappproperties' => 1,
+            'admin.getbannedusers' => 1,
+            'admin.getlivestreamvialink' => 1,
+            'admin.getmetrics' => 1,
+            'admin.getrestrictioninfo' => 1,
+            'application.getpublicinfo' => 1,
+            'auth.getapppublickey' => 1,
+            'auth.getsession' => 1,
+            'auth.getsignedpublicsessiondata' => 1,
+            'comments.get' => 1,
+            'connect.getunconnectedfriendscount' => 1,
+            'dashboard.getactivity' => 1,
+            'dashboard.getcount' => 1,
+            'dashboard.getglobalnews' => 1,
+            'dashboard.getnews' => 1,
+            'dashboard.multigetcount' => 1,
+            'dashboard.multigetnews' => 1,
+            'data.getcookies' => 1,
+            'events.get' => 1,
+            'events.getmembers' => 1,
+            'fbml.getcustomtags' => 1,
+            'feed.getappfriendstories' => 1,
+            'feed.getregisteredtemplatebundlebyid' => 1,
+            'feed.getregisteredtemplatebundles' => 1,
+            'fql.multiquery' => 1,
+            'fql.query' => 1,
+            'friends.arefriends' => 1,
+            'friends.get' => 1,
+            'friends.getappusers' => 1,
+            'friends.getlists' => 1,
+            'friends.getmutualfriends' => 1,
+            'gifts.get' => 1,
+            'groups.get' => 1,
+            'groups.getmembers' => 1,
+            'intl.gettranslations' => 1,
+            'links.get' => 1,
+            'notes.get' => 1,
+            'notifications.get' => 1,
+            'pages.getinfo' => 1,
+            'pages.isadmin' => 1,
+            'pages.isappadded' => 1,
+            'pages.isfan' => 1,
+            'permissions.checkavailableapiaccess' => 1,
+            'permissions.checkgrantedapiaccess' => 1,
+            'photos.get' => 1,
+            'photos.getalbums' => 1,
+            'photos.gettags' => 1,
+            'profile.getinfo' => 1,
+            'profile.getinfooptions' => 1,
+            'stream.get' => 1,
+            'stream.getcomments' => 1,
+            'stream.getfilters' => 1,
+            'users.getinfo' => 1,
+            'users.getloggedinuser' => 1,
+            'users.getstandardinfo' => 1,
+            'users.hasapppermission' => 1,
+            'users.isappuser' => 1,
+            'users.isverified' => 1,
+            'video.getuploadlimits' => 1);
+    $name = 'api';
+    if (isset($READ_ONLY_CALLS[strtolower($method)])) {
+      $name = 'api_read';
+    } else if (strtolower($method) == 'video.upload') {
+      $name = 'api_video';
+    }
+    return self::getUrl($name, 'restserver.php');
+  }
+
+  /**
+   * Build the URL for given domain alias, path and parameters.
+   *
+   * @param $name string The name of the domain
+   * @param $path string Optional path (without a leading slash)
+   * @param $params array Optional query parameters
+   *
+   * @return string The URL for the given parameters
+   */
+  protected function getUrl($name, $path='', $params=array()) {
+    $url = self::$DOMAIN_MAP[$name];
+    if ($path) {
+      if ($path[0] === '/') {
+        $path = substr($path, 1);
+      }
+      $url .= $path;
+    }
+    if ($params) {
+      $url .= '?' . http_build_query($params, null, '&');
+    }
+
+    return $url;
+  }
+
+  /**
+   * Returns the Current URL, stripping it of known FB parameters that should
+   * not persist.
+   *
+   * @return string The current URL
+   */
+  protected function getCurrentUrl() {
+    if (isset($_SERVER['HTTPS']) &&
+        ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] == 1) ||
+        isset($_SERVER['HTTP_X_FORWARDED_PROTO']) &&
+        $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
+      $protocol = 'https://';
+    }
+    else {
+      $protocol = 'http://';
+    }
+    $currentUrl = $protocol . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
+    $parts = parse_url($currentUrl);
+
+    $query = '';
+    if (!empty($parts['query'])) {
+      // drop known fb params
+      $params = explode('&', $parts['query']);
+      $retained_params = array();
+      foreach ($params as $param) {
+        if ($this->shouldRetainParam($param)) {
+          $retained_params[] = $param;
+        }
+      }
+
+      if (!empty($retained_params)) {
+        $query = '?'.implode($retained_params, '&');
+      }
+    }
+
+    // use port if non default
+    $port =
+      isset($parts['port']) &&
+      (($protocol === 'http://' && $parts['port'] !== 80) ||
+       ($protocol === 'https://' && $parts['port'] !== 443))
+      ? ':' . $parts['port'] : '';
+
+    // rebuild
+    return $protocol . $parts['host'] . $port . $parts['path'] . $query;
+  }
+
+  /**
+   * Returns true if and only if the key or key/value pair should
+   * be retained as part of the query string.  This amounts to
+   * a brute-force search of the very small list of Facebook-specific
+   * params that should be stripped out.
+   *
+   * @param string $param A key or key/value pair within a URL's query (e.g.
+   *                     'foo=a', 'foo=', or 'foo'.
+   *
+   * @return boolean
+   */
+  protected function shouldRetainParam($param) {
+    foreach (self::$DROP_QUERY_PARAMS as $drop_query_param) {
+      if (strpos($param, $drop_query_param.'=') === 0) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  /**
+   * Analyzes the supplied result to see if it was thrown
+   * because the access token is no longer valid.  If that is
+   * the case, then we destroy the session.
+   *
+   * @param $result array A record storing the error message returned
+   *                      by a failed API call.
+   */
+  protected function throwAPIException($result) {
+    $e = new FacebookApiException($result);
+    switch ($e->getType()) {
+      // OAuth 2.0 Draft 00 style
+      case 'OAuthException':
+        // OAuth 2.0 Draft 10 style
+      case 'invalid_token':
+        // REST server errors are just Exceptions
+      case 'Exception':
+        $message = $e->getMessage();
+        if ((strpos($message, 'Error validating access token') !== false) ||
+            (strpos($message, 'Invalid OAuth access token') !== false) ||
+            (strpos($message, 'An active access token must be used') !== false)
+        ) {
+          $this->destroySession();
+        }
+        break;
+    }
+
+    throw $e;
+  }
+
+
+  /**
+   * Prints to the error log if you aren't in command line mode.
+   *
+   * @param string $msg Log message
+   */
+  protected static function errorLog($msg) {
+    // disable error log if we are running in a CLI environment
+    // @codeCoverageIgnoreStart
+    if (php_sapi_name() != 'cli') {
+      error_log($msg);
+    }
+    // uncomment this if you want to see the errors on the page
+    // print 'error_log: '.$msg."\n";
+    // @codeCoverageIgnoreEnd
+  }
+
+  /**
+   * Base64 encoding that doesn't need to be urlencode()ed.
+   * Exactly the same as base64_encode except it uses
+   *   - instead of +
+   *   _ instead of /
+   *
+   * @param string $input base64UrlEncoded string
+   * @return string
+   */
+  protected static function base64UrlDecode($input) {
+    return base64_decode(strtr($input, '-_', '+/'));
+  }
+
+  /**
+   * Destroy the current session
+   */
+  public function destroySession() {
+    $this->accessToken = null;
+    $this->signedRequest = null;
+    $this->user = null;
+    $this->clearAllPersistentData();
+
+    // Javascript sets a cookie that will be used in getSignedRequest that we
+    // need to clear if we can
+    $cookie_name = $this->getSignedRequestCookieName();
+    if (array_key_exists($cookie_name, $_COOKIE)) {
+      unset($_COOKIE[$cookie_name]);
+      if (!headers_sent()) {
+        // The base domain is stored in the metadata cookie if not we fallback
+        // to the current hostname
+        $base_domain = '.'. $_SERVER['HTTP_HOST'];
+
+        $metadata = $this->getMetadataCookie();
+        if (array_key_exists('base_domain', $metadata) &&
+            !empty($metadata['base_domain'])) {
+          $base_domain = $metadata['base_domain'];
+        }
+
+        setcookie($cookie_name, '', 0, '/', $base_domain);
+      } else {
+        self::errorLog(
+          'There exists a cookie that we wanted to clear that we couldn\'t '.
+          'clear because headers was already sent. Make sure to do the first '.
+          'API call before outputing anything'
+        );
+      }
+    }
+  }
+
+  /**
+   * Parses the metadata cookie that our Javascript API set
+   *
+   * @return  an array mapping key to value
+   */
+  protected function getMetadataCookie() {
+    $cookie_name = $this->getMetadataCookieName();
+    if (!array_key_exists($cookie_name, $_COOKIE)) {
+      return array();
+    }
+
+    // The cookie value can be wrapped in "-characters so remove them
+    $cookie_value = trim($_COOKIE[$cookie_name], '"');
+
+    if (empty($cookie_value)) {
+      return array();
+    }
+
+    $parts = explode('&', $cookie_value);
+    $metadata = array();
+    foreach ($parts as $part) {
+      $pair = explode('=', $part, 2);
+      if (!empty($pair[0])) {
+        $metadata[urldecode($pair[0])] =
+          (count($pair) > 1) ? urldecode($pair[1]) : '';
+      }
+    }
+
+    return $metadata;
+  }
+
+  /**
+   * Each of the following four methods should be overridden in
+   * a concrete subclass, as they are in the provided Facebook class.
+   * The Facebook class uses PHP sessions to provide a primitive
+   * persistent store, but another subclass--one that you implement--
+   * might use a database, memcache, or an in-memory cache.
+   *
+   * @see Facebook
+   */
+
+  /**
+   * Stores the given ($key, $value) pair, so that future calls to
+   * getPersistentData($key) return $value. This call may be in another request.
+   *
+   * @param string $key
+   * @param array $value
+   *
+   * @return void
+   */
+  abstract protected function setPersistentData($key, $value);
+
+  /**
+   * Get the data for $key, persisted by BaseFacebook::setPersistentData()
+   *
+   * @param string $key The key of the data to retrieve
+   * @param boolean $default The default value to return if $key is not found
+   *
+   * @return mixed
+   */
+  abstract protected function getPersistentData($key, $default = false);
+
+  /**
+   * Clear the data with $key from the persistent storage
+   *
+   * @param string $key
+   * @return void
+   */
+  abstract protected function clearPersistentData($key);
+
+  /**
+   * Clear all data from the persistent storage
+   *
+   * @return void
+   */
+  abstract protected function clearAllPersistentData();
+}

+ 93 - 0
main/auth/external_login/facebook-php-sdk/src/facebook.php

@@ -0,0 +1,93 @@
+<?php
+/**
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+require_once "base_facebook.php";
+
+/**
+ * Extends the BaseFacebook class with the intent of using
+ * PHP sessions to store user ids and access tokens.
+ */
+class Facebook extends BaseFacebook
+{
+  /**
+   * Identical to the parent constructor, except that
+   * we start a PHP session to store the user ID and
+   * access token if during the course of execution
+   * we discover them.
+   *
+   * @param Array $config the application configuration.
+   * @see BaseFacebook::__construct in facebook.php
+   */
+  public function __construct($config) {
+    if (!session_id()) {
+      session_start();
+    }
+    parent::__construct($config);
+  }
+
+  protected static $kSupportedKeys =
+    array('state', 'code', 'access_token', 'user_id');
+
+  /**
+   * Provides the implementations of the inherited abstract
+   * methods.  The implementation uses PHP sessions to maintain
+   * a store for authorization codes, user ids, CSRF states, and
+   * access tokens.
+   */
+  protected function setPersistentData($key, $value) {
+    if (!in_array($key, self::$kSupportedKeys)) {
+      self::errorLog('Unsupported key passed to setPersistentData.');
+      return;
+    }
+
+    $session_var_name = $this->constructSessionVariableName($key);
+    $_SESSION[$session_var_name] = $value;
+  }
+
+  protected function getPersistentData($key, $default = false) {
+    if (!in_array($key, self::$kSupportedKeys)) {
+      self::errorLog('Unsupported key passed to getPersistentData.');
+      return $default;
+    }
+
+    $session_var_name = $this->constructSessionVariableName($key);
+    return isset($_SESSION[$session_var_name]) ?
+      $_SESSION[$session_var_name] : $default;
+  }
+
+  protected function clearPersistentData($key) {
+    if (!in_array($key, self::$kSupportedKeys)) {
+      self::errorLog('Unsupported key passed to clearPersistentData.');
+      return;
+    }
+
+    $session_var_name = $this->constructSessionVariableName($key);
+    unset($_SESSION[$session_var_name]);
+  }
+
+  protected function clearAllPersistentData() {
+    foreach (self::$kSupportedKeys as $key) {
+      $this->clearPersistentData($key);
+    }
+  }
+
+  protected function constructSessionVariableName($key) {
+    return implode('_', array('fb',
+                              $this->getAppId(),
+                              $key));
+  }
+}

+ 121 - 0
main/auth/external_login/facebook-php-sdk/src/fb_ca_chain_bundle.crt

@@ -0,0 +1,121 @@
+-----BEGIN CERTIFICATE-----
+MIIFgjCCBGqgAwIBAgIQDKKbZcnESGaLDuEaVk6fQjANBgkqhkiG9w0BAQUFADBm
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+UABTACAAYQBuAGQAIAB0AGgAZQAgAFIAZQBsAHkAaQBuAGcAIABQAGEAcgB0AHkA
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+ZQAuMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjANBgkqhkiG9w0BAQUF
+AAOCAQEACOkTIdxMy11+CKrbGNLBSg5xHaTvu/v1wbyn3dO/mf68pPfJnX6ShPYy
+4XM4Vk0x4uaFaU4wAGke+nCKGi5dyg0Esg7nemLNKEJaFAJZ9enxZm334lSCeARy
+wlDtxULGOFRyGIZZPmbV2eNq5xdU/g3IuBEhL722mTpAye9FU/J8Wsnw54/gANyO
+Gzkewigua8ip8Lbs9Cht399yAfbfhUP1DrAm/xEcnHrzPr3cdCtOyJaM6SRPpRqH
+ITK5Nc06tat9lXVosSinT3KqydzxBYua9gCFFiR3x3DgZfvXkC6KDdUlDrNcJUub
+a1BHnLLP4mxTHL6faAXYd05IxNn/IA==
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIGVTCCBT2gAwIBAgIQCFH5WYFBRcq94CTiEsnCDjANBgkqhkiG9w0BAQUFADBs
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+ 35 - 0
main/auth/external_login/facebook.conf.php

@@ -0,0 +1,35 @@
+<?php 
+/**
+ * Licence: GPL
+ * Please contact CBlue regarding any licences issues.
+ * Author: noel@cblue.be
+ *  Copyright: CBlue SPRL, 20XX
+ *
+ * External login module : FACEBOOK
+ *
+ * Configuration file 
+ * Please edit this file to match with your FACEBOOK settings
+ **/
+
+/** 
+ * Facebook application setting
+ **/
+require_once dirname(__FILE__).'/facebook-php-sdk/src/facebook.php';
+
+global $facebook_config; 
+/** 
+ * Decomment those lines and put your facebook app parameters here
+ * Find them here : https://developers.facebook.com/apps/
+ **/
+/*$facebook_config = array('appId'=> 'APPID',
+		'secret' => 'secret app',
+		'return_url' => api_get_path(WEB_PATH).'?action=fbconnect');
+ */
+
+global $facebook;
+$facebook = new Facebook(array(
+			'appId'  => $facebook_config['appId'],
+			'secret' => $facebook_config['secret']
+			));
+require_once dirname(__FILE__).'/facebook.inc.php';
+?>

+ 93 - 0
main/auth/external_login/facebook.inc.php

@@ -0,0 +1,93 @@
+<?php
+/**
+ * Licence: GPL
+ * Please contact CBlue regarding any licences issues.
+ * Author: noel@cblue.be
+ *  Copyright: CBlue SPRL, 20XX
+ *
+ * External login module : FACEBOOK
+ *
+ * This files provides the facebook_connect()  and facebook_get_url functions
+ * Please edit the facebook.conf.php file to adapt it to your fb application parameter
+ **/
+require_once dirname(__FILE__).'/../../inc/global.inc.php';
+require_once dirname(__FILE__).'/facebook.conf.php';
+require_once dirname(__FILE__).'/facebook-php-sdk/src/facebook.php';
+require_once dirname(__FILE__).'/functions.inc.php';
+
+/** 
+  * This function connect to facebook and retrieves the user info
+  * If user does not exist in chamilo, it creates it and logs in
+  * If user already exists, it updates his info
+**/
+function facebook_connect() { 
+	global $facebook;
+	// See if there is a user from a cookie
+	$user = $facebook->getUser();
+	if ($user) {
+		try {
+			//Gets facebook user info
+			$fu = $facebook->api('/me');
+			$username = api_get_setting('login_is_email') == 'true' ? $fu['email'] : $fu['username'];
+			//Checks if user already exists in chamilo
+			$u = array(
+					'firstname' => $fu['first_name'],
+					'lastname' => $fu['last_name'],
+					'status' => STUDENT,
+					'email' => $fu['email'],
+					'username' => $username,
+					'language' => 'french',
+					'password' => DEFAULT_PASSWORD,
+					'auth_source' => 'facebook',
+					//'courses' => $user_info['courses'],
+					//'profile_link' => $user_info['profile_link'],
+					//'worldwide_bu' => $user_info['worlwide_bu'],
+					//'manager' => $user_info['manager'],
+					'extra' => array()
+					);
+			$cu = api_get_user_info_from_username($username);
+			$chamilo_uinfo = api_get_user_info_from_username($username);
+			if ( $chamilo_uinfo  === false) {
+				//we have to create the user
+				$chamilo_uid = external_add_user($u);
+				if ($chamilo_uid !==false) {
+					$_user['user_id'] = $chamilo_uid;
+					$_user['uidReset'] = true;  
+					$_SESSION['_user'] = $_user;
+					header('Location:'.api_get_path(WEB_PATH));
+					exit();
+				} else {
+					return false;
+				}
+			} else {//User already exists, update info and login
+				$chamilo_uid = $chamilo_uinfo['user_id'];
+				$u['user_id'] = $chamilo_uid;
+				external_update_user($u);
+				$_user['user_id'] = $chamilo_uid;
+				$_user['uidReset'] = true;  
+				$_SESSION['_user'] = $_user;
+				header('Location:'.api_get_path(WEB_PATH));
+				exit();
+			}
+		} catch (FacebookApiException $e) {
+			echo '<pre>'.htmlspecialchars(print_r($e, true)).'</pre>';
+			$user = null;
+		}
+	}
+}
+
+/**
+* Get facebook login url for the platform
+**/
+function facebook_get_login_url(){
+	global $facebook, $facebook_config;
+
+	$login_url = $facebook->getLoginUrl(
+			array(
+				'scope'	=> 'email,publish_stream',
+				'redirect_uri' => $facebook_config['return_url']
+				)
+			); 
+	return $login_url;
+}
+