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<?php |
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namespace Kerox\Messenger\Api; |
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use GuzzleHttp\Psr7\ServerRequest; |
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use Kerox\Messenger\Helper\XHubSignatureHelper; |
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use Kerox\Messenger\Model\Callback\Entry; |
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use Kerox\Messenger\Request\WebhookRequest; |
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use Kerox\Messenger\Response\WebhookResponse; |
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class Webhook extends AbstractApi |
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{ |
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/** |
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* @var string |
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*/ |
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protected $appSecret; |
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/** |
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* @var string |
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*/ |
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protected $verifyToken; |
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/** |
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* @var \Psr\Http\Message\ServerRequestInterface |
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*/ |
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protected $request; |
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/** |
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* @var array |
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*/ |
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protected $decodedBody; |
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/** |
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* @var \Kerox\Messenger\Model\Entry[] |
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*/ |
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protected $hydratedEntries; |
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/** |
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* Webhook constructor. |
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* |
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* @param string $appSecret |
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* @param string $verifyToken |
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* @param string $pageToken |
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*/ |
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public function __construct(string $appSecret, string $verifyToken, string $pageToken) |
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{ |
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parent::__construct($pageToken); |
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$this->appSecret = $appSecret; |
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$this->verifyToken = $verifyToken; |
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$this->request = ServerRequest::fromGlobals(); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isValidToken(): bool |
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{ |
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if ($this->request->getMethod() !== 'GET') { |
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return false; |
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} |
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$params = $this->request->getQueryParams(); |
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if (!isset($params['hub_verify_token'])) { |
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return false; |
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} |
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return ($params['hub_mode'] === 'subscribe' && $params['hub_verify_token'] === $this->verifyToken); |
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} |
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/** |
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* @return string|null |
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*/ |
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public function getChallenge() |
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{ |
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$params = $this->request->getQueryParams(); |
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return $params['hub_challenge'] ?? null; |
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} |
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/** |
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* @return \Kerox\Messenger\Response\WebhookResponse |
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*/ |
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public function sendSubscribe(): WebhookResponse |
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{ |
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$request = new WebhookRequest($this->pageToken); |
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$response = $this->client->post('/me/subscribed_apps', $request->build()); |
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return new WebhookResponse($response); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isValidCallback(): bool |
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{ |
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if ($this->isValidHubSignature()) { |
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return false; |
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} |
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$decodedBody = $this->getDecodedBody(); |
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$object = $decodedBody['object'] ?? null; |
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$entry = $decodedBody['entry'] ?? null; |
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return ($object === 'page' && $entry !== null); |
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} |
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/** |
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* @return array |
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* @throws \Exception |
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*/ |
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public function getDecodedBody(): array |
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{ |
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if (is_null($this->decodedBody)) { |
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$decodedBody = json_decode($this->request->getBody(), true); |
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if (json_last_error() !== JSON_ERROR_NONE) { |
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throw new \Exception('Error while parsing the request body'); |
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} |
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$this->decodedBody = $decodedBody; |
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} |
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return $this->decodedBody; |
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} |
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/** |
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* @return \Kerox\Messenger\Model\Entry[] |
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*/ |
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public function getCallbackEntries(): array |
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{ |
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return $this->getHydratedEntries(); |
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} |
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/** |
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* @return array |
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*/ |
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public function getCallbackEvents(): array |
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{ |
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$events = []; |
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foreach ($this->getHydratedEntries() as $hydratedEntry) { |
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/** @var \Kerox\Messenger\Model\Callback\Entry $hydratedEntry */ |
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$events[] += $hydratedEntry->getEvents(); |
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} |
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return $events; |
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} |
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/** |
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* @return array|\Kerox\Messenger\Model\Callback\Entry[] |
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*/ |
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private function getHydratedEntries(): array |
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{ |
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if (is_null($this->hydratedEntries)) { |
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$decodedBody = $this->getDecodedBody(); |
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$hydrated = []; |
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foreach ($decodedBody['entry'] as $entry) { |
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$hydrated[] = Entry::create($entry); |
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} |
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$this->hydratedEntries = $hydrated; |
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} |
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return $this->hydratedEntries; |
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} |
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/** |
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* @return bool |
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*/ |
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private function isValidHubSignature(): bool |
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{ |
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$headers = $this->request->getHeader('X-Hub-Signature'); |
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$content = $this->request->getBody(); |
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if (empty($headers)) { |
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return false; |
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} |
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return XHubSignatureHelper::validate($content, $this->appSecret, $headers[0]); |
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} |
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} |
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ker0x /
messenger
