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<?php |
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namespace Tgallice\FBMessenger; |
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use GuzzleHttp\Psr7\ServerRequest; |
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use Psr\Http\Message\RequestInterface; |
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use Tgallice\FBMessenger\Callback\CallbackEvent; |
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use Tgallice\FBMessenger\Model\Callback\Entry; |
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class WebhookRequestHandler |
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{ |
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/** |
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* @var RequestInterface |
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*/ |
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private $request; |
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/** |
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* App secret used to verify the request sha1 |
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* |
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* @var string |
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*/ |
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private $secret; |
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/** |
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* @var array |
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*/ |
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private $decodedBody; |
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/** |
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* @var Entry[] |
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*/ |
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private $hydratedEntries; |
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/** |
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* @param string $secret |
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* @param RequestInterface|null $request |
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*/ |
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public function __construct($secret, RequestInterface $request = null) |
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{ |
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$this->secret = $secret; |
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$this->request = null === $request ? ServerRequest::fromGlobals() : $request; |
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} |
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/** |
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* Check if the request is a valid webhook request |
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* |
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* @return bool |
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*/ |
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public function isValid() |
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{ |
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if (!$this->isValidHeader()) { |
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return false; |
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} |
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$decoded = $this->getDecodedBody(); |
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$object = isset($decoded['object']) ? $decoded['object'] : null; |
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$entry = isset($decoded['entry']) ? $decoded['entry'] : null; |
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return $object === 'page' && null !== $entry; |
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} |
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/** |
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* @return CallbackEvent[] |
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*/ |
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public function getAllCallbackEvents() |
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{ |
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$events = []; |
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foreach ($this->getHydratedEntries() as $hydratedEntry) { |
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$events = array_merge($events, $hydratedEntry->getCallbackEvents()); |
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} |
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return $events; |
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} |
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/** |
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* @return Entry[] |
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*/ |
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public function getEntries() |
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{ |
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return $this->getHydratedEntries(); |
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} |
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/** |
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* @return RequestInterface |
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*/ |
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public function getRequest() |
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{ |
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return $this->request; |
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} |
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/** |
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* @return array |
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*/ |
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public function getDecodedBody() |
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{ |
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if (isset($this->decodedBody)) { |
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return $this->decodedBody; |
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} |
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$body = (string) $this->request->getBody(); |
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$decoded = @json_decode($body, true); |
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return $this->decodedBody = null === $decoded ? [] : $decoded; |
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} |
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/** |
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* @return Entry[] |
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*/ |
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private function getHydratedEntries() |
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{ |
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if (isset($this->hydratedEntries)) { |
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return $this->hydratedEntries; |
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} |
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$decodedBody = $this->getDecodedBody(); |
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$entries = $decodedBody['entry']; |
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$hydrated = []; |
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foreach ($entries as $entry) { |
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$hydrated[] = Entry::create($entry); |
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} |
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return $this->hydratedEntries = $hydrated; |
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} |
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/** |
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* @return bool |
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*/ |
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3 |
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private function isValidHeader() |
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{ |
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$payload = (string) $this->request->getBody(); |
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$headers = $this->request->getHeader('X-Hub-Signature'); |
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if (empty($headers)) { |
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return false; |
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} |
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$signature = XHubSignature::parseHeader($headers[0]); |
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return XHubSignature::validate($payload, $this->secret, $signature); |
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} |
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} |
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tgallice /
fb-messenger-sdk
