function _onFollowMeCommand()

in react/features/follow-me/middleware.js [93:165]
47 lines of code
19 McCabe index (conditional complexity)

function _onFollowMeCommand(attributes = {}, id, store) {
    const state = store.getState();

    // We require to know who issued the command because (1) only a
    // moderator is allowed to send commands and (2) a command MUST be
    // issued by a defined commander.
    if (typeof id === 'undefined') {
        return;
    }

    const participantSendingCommand = getParticipantById(state, id);

    // The Command(s) API will send us our own commands and we don't want
    // to act upon them.
    if (participantSendingCommand.local) {
        return;
    }

    if (participantSendingCommand.role !== 'moderator') {
        logger.warn('Received follow-me command not from moderator');

        return;
    }

    if (!isFollowMeActive(state)) {
        store.dispatch(setFollowMeModerator(id));
    }

    // just a command that follow me was turned off
    if (attributes.off) {
        store.dispatch(setFollowMeModerator());

        return;
    }

    const oldState = state['features/follow-me'].state || {};

    store.dispatch(setFollowMeState(attributes));

    // XMPP will translate all booleans to strings, so explicitly check against
    // the string form of the boolean {@code true}.
    if (oldState.filmstripVisible !== attributes.filmstripVisible) {
        store.dispatch(setFilmstripVisible(attributes.filmstripVisible === 'true'));
    }

    if (oldState.tileViewEnabled !== attributes.tileViewEnabled) {
        store.dispatch(setTileView(attributes.tileViewEnabled === 'true'));
    }

    // For now gate etherpad checks behind a web-app check to be extra safe
    // against calling a web-app global.
    if (typeof APP !== 'undefined'
        && oldState.sharedDocumentVisible !== attributes.sharedDocumentVisible) {
        const isEtherpadVisible = attributes.sharedDocumentVisible === 'true';
        const documentManager = APP.UI.getSharedDocumentManager();

        if (documentManager
                && isEtherpadVisible !== state['features/etherpad'].editing) {
            documentManager.toggleEtherpad();
        }
    }

    const pinnedParticipant = getPinnedParticipant(state);
    const idOfParticipantToPin = attributes.nextOnStage;

    if (typeof idOfParticipantToPin !== 'undefined'
            && (!pinnedParticipant || idOfParticipantToPin !== pinnedParticipant.id)
            && oldState.nextOnStage !== attributes.nextOnStage) {
        _pinVideoThumbnailById(store, idOfParticipantToPin);
    } else if (typeof idOfParticipantToPin === 'undefined' && pinnedParticipant) {
        store.dispatch(pinParticipant(null));
    }
}