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<?php |
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namespace Botonomous\listener; |
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use Botonomous\BotonomousException; |
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use Botonomous\Config; |
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use Botonomous\Event; |
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use Botonomous\utility\RequestUtility; |
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abstract class AbstractBaseListener |
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{ |
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const ORIGIN_VERIFICATION_SUCCESS_KEY = 'success'; |
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const ORIGIN_VERIFICATION_MESSAGE_KEY = 'message'; |
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private $config; |
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private $request; |
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private $requestUtility; |
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/** |
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* listen. |
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* |
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* @throws \Exception |
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* |
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* @return mixed |
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*/ |
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public function listen() |
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{ |
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// This is needed otherwise timeout error is displayed |
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$this->respondOK(); |
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$request = $this->extractRequest(); |
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if (empty($request)) { |
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/* @noinspection PhpInconsistentReturnPointsInspection */ |
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return; |
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} |
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$this->setRequest($request); |
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if ($this->isThisBot() !== false) { |
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/* @noinspection PhpInconsistentReturnPointsInspection */ |
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return; |
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} |
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return $request; |
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} |
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/** |
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* @return mixed |
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*/ |
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abstract public function extractRequest(); |
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/** |
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* @return string |
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*/ |
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abstract public function getChannelId(): string; |
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/** |
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* @return string |
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*/ |
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abstract public function getKey(): string; |
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/** |
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* @param null|string $key |
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* |
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* @return mixed |
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*/ |
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public function getRequest(string $key = null) |
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{ |
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if (!isset($this->request)) { |
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// each listener has its own way of extracting the request |
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$this->setRequest($this->extractRequest()); |
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} |
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if ($key === null) { |
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// return the entire request since key is null |
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return $this->request; |
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} |
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if (is_array($this->request) && array_key_exists($key, $this->request)) { |
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return $this->request[$key]; |
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} |
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} |
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/** |
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* @param array $request |
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*/ |
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public function setRequest($request) |
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{ |
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$this->request = $request; |
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} |
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/** |
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* @return Config |
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*/ |
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public function getConfig(): Config |
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{ |
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if (!isset($this->config)) { |
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$this->setConfig(new Config()); |
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} |
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return $this->config; |
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} |
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/** |
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* @param Config $config |
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*/ |
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public function setConfig(Config $config) |
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{ |
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$this->config = $config; |
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} |
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/** |
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* Verify the request comes from Slack |
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* Each listener must have have this and has got its own way to check the request. |
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* |
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* @throws \Exception |
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* |
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* @return array |
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*/ |
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abstract public function verifyOrigin(); |
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/** |
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* Check if the request belongs to the bot itself. |
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* |
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* @throws \Exception |
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* |
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* @return bool |
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*/ |
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abstract public function isThisBot(): bool; |
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/** |
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* @return RequestUtility |
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*/ |
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public function getRequestUtility(): RequestUtility |
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{ |
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if (!isset($this->requestUtility)) { |
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$this->setRequestUtility((new RequestUtility())); |
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} |
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return $this->requestUtility; |
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} |
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/** |
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* @param RequestUtility $requestUtility |
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*/ |
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public function setRequestUtility(RequestUtility $requestUtility) |
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{ |
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$this->requestUtility = $requestUtility; |
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} |
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/** |
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* respondOK. |
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*/ |
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protected function respondOK() |
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{ |
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// check if fastcgi_finish_request is callable |
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if (is_callable('fastcgi_finish_request')) { |
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/* |
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* http://stackoverflow.com/a/38918192 |
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* This works in Nginx but the next approach not |
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*/ |
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session_write_close(); |
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fastcgi_finish_request(); |
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/* @noinspection PhpInconsistentReturnPointsInspection */ |
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return; |
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} |
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ignore_user_abort(true); |
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ob_start(); |
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header($this->getRequestUtility()->getServerProtocol().' 200 OK'); |
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// Disable compression (in case content length is compressed). |
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header('Content-Encoding: none'); |
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header('Content-Length: '.ob_get_length()); |
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// Close the connection. |
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header('Connection: close'); |
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ob_end_flush(); |
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// only if an output buffer is active do ob_flush |
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if (ob_get_level() > 0) { |
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ob_flush(); |
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} |
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flush(); |
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/* @noinspection PhpInconsistentReturnPointsInspection */ |
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} |
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/** |
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* @throws \Exception |
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* |
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* @return array<string,boolean|string> |
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*/ |
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public function verifyRequest(): array |
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{ |
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$originCheck = $this->verifyOrigin(); |
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if (!isset($originCheck[self::ORIGIN_VERIFICATION_SUCCESS_KEY])) { |
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throw new BotonomousException('Success must be provided in verifyOrigin response'); |
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} |
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if ($originCheck[self::ORIGIN_VERIFICATION_SUCCESS_KEY] !== true) { |
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return [ |
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self::ORIGIN_VERIFICATION_SUCCESS_KEY => false, |
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self::ORIGIN_VERIFICATION_MESSAGE_KEY => $originCheck[self::ORIGIN_VERIFICATION_MESSAGE_KEY] |
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]; |
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} |
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if ($this->isThisBot() !== false) { |
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return [ |
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self::ORIGIN_VERIFICATION_SUCCESS_KEY => false, |
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self::ORIGIN_VERIFICATION_MESSAGE_KEY => 'Request comes from the bot' |
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]; |
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} |
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return [self::ORIGIN_VERIFICATION_SUCCESS_KEY => true, self::ORIGIN_VERIFICATION_MESSAGE_KEY => 'Yay!']; |
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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 determineAction() |
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{ |
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$utility = $this->getRequestUtility(); |
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$getRequest = $utility->getGet(); |
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if (!empty($getRequest['action'])) { |
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return strtolower($getRequest['action']); |
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} |
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$request = $utility->getPostedBody(); |
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if (isset($request['type']) && $request['type'] === 'url_verification') { |
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return 'url_verification'; |
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} |
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} |
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/** |
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* Return message based on the listener |
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* If listener is event and event text is empty, fall back to request text. |
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* |
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* @throws \Exception |
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* |
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* @return mixed|string |
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*/ |
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public function getMessage() |
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{ |
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if ($this instanceof EventListener && $this->getEvent() instanceof Event) { |
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$message = $this->getEvent()->getText(); |
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if (!empty($message)) { |
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return $message; |
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} |
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} |
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return $this->getRequest('text'); |
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} |
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} |
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