rugk / threema-msgapi-sdk-php

		else if($message instanceof FileMessage) {

			$result = $this->downloadFile($message, $message->getBlobId(), $downloadMessage);

			if(null !== $result && true === $result->isSuccess()) {

				$file = $this->cryptTool->decryptFile(

					$result->getData(),

					hex2bin($message->getEncryptionKey()));

				if (null === $file) {

					throw new Exception('file decryption failed');

				}

				//save file

				$filePath = $outputFolder . '/' . $messageId . '-' . $message->getFilename();

				file_put_contents($filePath, $file);

				$receiveResult->addFile('file', $filePath);

			}

			if(null !== $message->getThumbnailBlobId() && strlen($message->getThumbnailBlobId()) > 0) {

				$result = $this->downloadFile($message, $message->getThumbnailBlobId(), $downloadMessage);

			if(null !== $message->getThumbnailBlobId() && strlen($message->getThumbnailBlobId()) > 0) {

				$result = $this->downloadFile($message, $message->getThumbnailBlobId(), $downloadMessage);

				if(null !== $result && true === $result->isSuccess()) {

					$file = $this->cryptTool->decryptFileThumbnail(

						$result->getData(),

						$this->cryptTool->hex2bin($message->getEncryptionKey()));

					if(null === $file) {

						throw new Exception('thumbnail decryption failed');

					}

					//save file

					$filePath = $outputFolder.'/'.$messageId.'-thumbnail-'.$message->getFilename();

					file_put_contents($filePath, $file);

					$receiveResult->addFile('thumbnail', $filePath);

				}

			}

		}