Файл: sngine-v2.8/Script/includes/libs/HybridAuth/Thirdparty/Facebook/SignedRequest.php
Строк: 278
<?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;
use FacebookExceptionsFacebookSDKException;
/**
* Class SignedRequest
*
* @package Facebook
*/
class SignedRequest
{
/**
* @var FacebookApp The FacebookApp entity.
*/
protected $app;
/**
* @var string The raw encrypted signed request.
*/
protected $rawSignedRequest;
/**
* @var array The payload from the decrypted signed request.
*/
protected $payload;
/**
* Instantiate a new SignedRequest entity.
*
* @param FacebookApp $facebookApp The FacebookApp entity.
* @param string|null $rawSignedRequest The raw signed request.
*/
public function __construct(FacebookApp $facebookApp, $rawSignedRequest = null)
{
$this->app = $facebookApp;
if (!$rawSignedRequest) {
return;
}
$this->rawSignedRequest = $rawSignedRequest;
$this->parse();
}
/**
* Returns the raw signed request data.
*
* @return string|null
*/
public function getRawSignedRequest()
{
return $this->rawSignedRequest;
}
/**
* Returns the parsed signed request data.
*
* @return array|null
*/
public function getPayload()
{
return $this->payload;
}
/**
* Returns a property from the signed request data if available.
*
* @param string $key
* @param mixed|null $default
*
* @return mixed|null
*/
public function get($key, $default = null)
{
if (isset($this->payload[$key])) {
return $this->payload[$key];
}
return $default;
}
/**
* Returns user_id from signed request data if available.
*
* @return string|null
*/
public function getUserId()
{
return $this->get('user_id');
}
/**
* Checks for OAuth data in the payload.
*
* @return boolean
*/
public function hasOAuthData()
{
return $this->get('oauth_token') || $this->get('code');
}
/**
* Creates a signed request from an array of data.
*
* @param array $payload
*
* @return string
*/
public function make(array $payload)
{
$payload['algorithm'] = isset($payload['algorithm']) ? $payload['algorithm'] : 'HMAC-SHA256';
$payload['issued_at'] = isset($payload['issued_at']) ? $payload['issued_at'] : time();
$encodedPayload = $this->base64UrlEncode(json_encode($payload));
$hashedSig = $this->hashSignature($encodedPayload);
$encodedSig = $this->base64UrlEncode($hashedSig);
return $encodedSig . '.' . $encodedPayload;
}
/**
* Validates and decodes a signed request and saves
* the payload to an array.
*/
protected function parse()
{
list($encodedSig, $encodedPayload) = $this->split();
// Signature validation
$sig = $this->decodeSignature($encodedSig);
$hashedSig = $this->hashSignature($encodedPayload);
$this->validateSignature($hashedSig, $sig);
$this->payload = $this->decodePayload($encodedPayload);
// Payload validation
$this->validateAlgorithm();
}
/**
* Splits a raw signed request into signature and payload.
*
* @return array
*
* @throws FacebookSDKException
*/
protected function split()
{
if (strpos($this->rawSignedRequest, '.') === false) {
throw new FacebookSDKException('Malformed signed request.', 606);
}
return explode('.', $this->rawSignedRequest, 2);
}
/**
* Decodes the raw signature from a signed request.
*
* @param string $encodedSig
*
* @return string
*
* @throws FacebookSDKException
*/
protected function decodeSignature($encodedSig)
{
$sig = $this->base64UrlDecode($encodedSig);
if (!$sig) {
throw new FacebookSDKException('Signed request has malformed encoded signature data.', 607);
}
return $sig;
}
/**
* Decodes the raw payload from a signed request.
*
* @param string $encodedPayload
*
* @return array
*
* @throws FacebookSDKException
*/
protected function decodePayload($encodedPayload)
{
$payload = $this->base64UrlDecode($encodedPayload);
if ($payload) {
$payload = json_decode($payload, true);
}
if (!is_array($payload)) {
throw new FacebookSDKException('Signed request has malformed encoded payload data.', 607);
}
return $payload;
}
/**
* Validates the algorithm used in a signed request.
*
* @throws FacebookSDKException
*/
protected function validateAlgorithm()
{
if ($this->get('algorithm') !== 'HMAC-SHA256') {
throw new FacebookSDKException('Signed request is using the wrong algorithm.', 605);
}
}
/**
* Hashes the signature used in a signed request.
*
* @param string $encodedData
*
* @return string
*
* @throws FacebookSDKException
*/
protected function hashSignature($encodedData)
{
$hashedSig = hash_hmac(
'sha256',
$encodedData,
$this->app->getSecret(),
$raw_output = true
);
if (!$hashedSig) {
throw new FacebookSDKException('Unable to hash signature from encoded payload data.', 602);
}
return $hashedSig;
}
/**
* Validates the signature used in a signed request.
*
* @param string $hashedSig
* @param string $sig
*
* @throws FacebookSDKException
*/
protected function validateSignature($hashedSig, $sig)
{
if (hash_equals($hashedSig, $sig)) {
return;
}
throw new FacebookSDKException('Signed request has an invalid signature.', 602);
}
/**
* Base64 decoding which replaces characters:
* + instead of -
* / instead of _
*
* @link http://en.wikipedia.org/wiki/Base64#URL_applications
*
* @param string $input base64 url encoded input
*
* @return string decoded string
*/
public function base64UrlDecode($input)
{
$urlDecodedBase64 = strtr($input, '-_', '+/');
$this->validateBase64($urlDecodedBase64);
return base64_decode($urlDecodedBase64);
}
/**
* Base64 encoding which replaces characters:
* + instead of -
* / instead of _
*
* @link http://en.wikipedia.org/wiki/Base64#URL_applications
*
* @param string $input string to encode
*
* @return string base64 url encoded input
*/
public function base64UrlEncode($input)
{
return strtr(base64_encode($input), '+/', '-_');
}
/**
* Validates a base64 string.
*
* @param string $input base64 value to validate
*
* @throws FacebookSDKException
*/
protected function validateBase64($input)
{
if (!preg_match('/^[a-zA-Z0-9/rn+]*={0,2}$/', $input)) {
throw new FacebookSDKException('Signed request contains malformed base64 encoding.', 608);
}
}
}