Nextcloud-App/lib/Service/MatrixService.php

<?php

namespace OCA\UPschooling\Service;

use Aryess\PhpMatrixSdk\Exceptions\MatrixException;
use Aryess\PhpMatrixSdk\Exceptions\MatrixRequestException;
use Aryess\PhpMatrixSdk\MatrixClient;
use Aryess\PhpMatrixSdk\Room;
use Psr\Log\LoggerInterface;

class MatrixService
{

    /** @var LoggerInterface */
    private $logger;

    /** @var string */
    private $channel;

    /** @var MatrixClient */
    private $client;

    /** @var string */
    private $token;

    /** @var Room */
    private $room;

    public function __construct(LoggerInterface $logger) {
        $this->logger = $logger;
        $this->channel = "#issue:synapse";
        $this->client = new MatrixClient("http://synapse:8008");
        $this->token = $this->client->login("upschooling", "secret");
//		try {
//            $this->room = $this->client->createRoom($this->channel, false, array());
//        } catch (MatrixException $createE) {
//			try {
//				$this->room = $this->client->joinRoom($this->channel);
//			} catch (MatrixException $e) {
//				$this->logger->error(
//					"Could not create room ".$this->channel,
//					array('exception' => $e, 'causedBy' => $createE)
//				);
//			}
//        }
    }

    /**
     * Sets a property on a channel.
     *
     * @param string $eventType a unique property identifier with reverse domain notation, e.g. com.example.property.
     * @param array $content the contents as a JSON serializable array.
     * @throws MatrixException
     */
    public function setProperty(string $eventType, array $content)
    {
        $this->room->sendStateEvent($eventType, $content);
    }

    /**
     * @param string $eventType a unique property identifier with reverse domain notation, e.g. com.example.property.
     * @return array the contents of the room state.
     * @throws MatrixException|MatrixRequestException
     */
    public function getProperty(string $eventType): array
    {
        // first parameter should be $this->room->roomId
        return $this->client->api()->getStateEvent($this->channel, $eventType);
    }

}