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<?php
/**
* Copyright 2017 Facebook, Inc.
*
* You are hereby granted a non-exclusive, worldwide, royalty-free license to
* use, copy, modify, and distribute this software in source code or binary
* form for use in connection with the web services and APIs provided by
* Facebook.
*
* As with any software that integrates with the Facebook platform, your use
* of this software is subject to the Facebook Developer Principles and
* Policies [http://developers.facebook.com/policy/]. This copyright notice
* shall be included in all copies or substantial portions of the software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
namespace Facebook\Helpers;
use Facebook\Facebook;
use Facebook\FacebookApp;
use Facebook\FacebookClient;
use Facebook\SignedRequest;
use Facebook\Authentication\AccessToken;
use Facebook\Authentication\OAuth2Client;
/**
* Class FacebookSignedRequestFromInputHelper
*
* @package Facebook
*/
abstract class FacebookSignedRequestFromInputHelper
{
/**
* @var SignedRequest|null The SignedRequest entity.
*/
protected $signedRequest;
/**
* @var FacebookApp The FacebookApp entity.
*/
protected $app;
/**
* @var OAuth2Client The OAuth 2.0 client service.
*/
protected $oAuth2Client;
/**
* Initialize the helper and process available signed request data.
*
* @param FacebookApp $app The FacebookApp entity.
* @param FacebookClient $client The client to make HTTP requests.
* @param string|null $graphVersion The version of Graph to use.
*/
public function __construct(FacebookApp $app, FacebookClient $client, $graphVersion = null)
{
$this->app = $app;
$graphVersion = $graphVersion ?: Facebook::DEFAULT_GRAPH_VERSION;
$this->oAuth2Client = new OAuth2Client($this->app, $client, $graphVersion);
$this->instantiateSignedRequest();
}
/**
* Instantiates a new SignedRequest entity.
*
* @param string|null
*/
public function instantiateSignedRequest($rawSignedRequest = null)
{
$rawSignedRequest = $rawSignedRequest ?: $this->getRawSignedRequest();
if (!$rawSignedRequest) {
return;
}
$this->signedRequest = new SignedRequest($this->app, $rawSignedRequest);
}
/**
* Returns an AccessToken entity from the signed request.
*
* @return AccessToken|null
*
* @throws \Facebook\Exceptions\FacebookSDKException
*/
public function getAccessToken()
{
if ($this->signedRequest && $this->signedRequest->hasOAuthData()) {
$code = $this->signedRequest->get('code');
$accessToken = $this->signedRequest->get('oauth_token');
if ($code && !$accessToken) {
return $this->oAuth2Client->getAccessTokenFromCode($code);
}
$expiresAt = $this->signedRequest->get('expires', 0);
return new AccessToken($accessToken, $expiresAt);
}
return null;
}
/**
* Returns the SignedRequest entity.
*
* @return SignedRequest|null
*/
public function getSignedRequest()
{
return $this->signedRequest;
}
/**
* Returns the user_id if available.
*
* @return string|null
*/
public function getUserId()
{
return $this->signedRequest ? $this->signedRequest->getUserId() : null;
}
/**
* Get raw signed request from input.
*
* @return string|null
*/
abstract public function getRawSignedRequest();
/**
* Get raw signed request from POST input.
*
* @return string|null
*/
public function getRawSignedRequestFromPost()
{
if (isset($_POST['signed_request'])) {
return $_POST['signed_request'];
}
return null;
}
/**
* Get raw signed request from cookie set from the Javascript SDK.
*
* @return string|null
*/
public function getRawSignedRequestFromCookie()
{
if (isset($_COOKIE['fbsr_' . $this->app->getId()])) {
return $_COOKIE['fbsr_' . $this->app->getId()];
}
return null;
}
}
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