Add endpoint to add a user to a call

Signed-off-by: Joas Schilling <coding@schilljs.com>

appinfo/routes.php

@@ -48,6 +48,11 @@ return [
 			'url' => '/api/room',
 			'verb' => 'GET',
 		],
+		[
+			'name' => 'api#addParticipantToRoom',
+			'url' => '/api/room/{roomId}',
+			'verb' => 'POST',
+		],
 		[
 			'name' => 'api#leaveRoom',
 			'url' => '/api/room/{roomId}',

lib/Controller/ApiController.php

@@ -277,6 +277,50 @@ class ApiController extends Controller {
 		return new JSONResponse(['roomId' => $room->getId()], Http::STATUS_CREATED);
 	}
 
+	/**
+	 * @NoAdminRequired
+	 *
+	 * @param int $roomId
+	 * @param string $newParticipant
+	 * @return JSONResponse
+	 */
+	public function addParticipantToRoom($roomId, $newParticipant) {
+		try {
+			$room = $this->manager->getRoomById($roomId);
+		} catch (RoomNotFoundException $e) {
+			return new JSONResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		$participants = $room->getParticipants();
+		if (!isset($participants[$this->userId])) {
+			return new JSONResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		if (isset($participants[$newParticipant])) {
+			return new JSONResponse([]);
+		}
+
+		$newUser = $this->userManager->get($newParticipant);
+		if (!$newUser instanceof IUser) {
+			return new JSONResponse([], Http::STATUS_NOT_FOUND);
+		}
+
+		if ($room->getType() === Room::ONE_TO_ONE_CALL) {
+			// In case a user is added to a one2one call, we create a new group call and add the participants manually
+			$room = $this->manager->createRoom(Room::GROUP_CALL, $this->secureRandom->generate(12));
+			foreach ($participants as $participant => $lastPing) {
+				$user = $this->userManager->get($participant);
+				if ($user instanceof IUser) {
+					$room->addUser($user);
+				}
+			}
+			return new JSONResponse(['roomId' => $room->getId()], Http::STATUS_CREATED);
+		}
+
+		$room->addUser($newUser);
+		return new JSONResponse([]);
+	}
+
 	/**
 	 * @NoAdminRequired
 	 *