emitActionsMiddleware.js

// import action types here

const emitActions = [
    PLAYQUEUE_ADD,
    PLAYQUEUE_REMOVE,
    PLAYQUEUE_MOVE,
    PLAYQUEUE_REPLACEDECK,
    PLAYQUEUE_REPLACE,
    PLAYQUEUE_CLEAR
];

const emitAndPreventActions = [
    PLAYER_TOGGLEPLAY,
    PLAYER_VOLUME,
    PLAYER_SEEK
];

const createEmitActionsMiddleware = ({ getState }) => next => action => {
    const allActions = emitActions.concat(emitAndPreventActions);
    if (action.type && allActions.indexOf(action.type) > -1) {
        if (window.io) {
            window.io.emit('state', { action });
        }

        // The action should be prevented on this device if we are a slave!
        const master = getState().device.master;
        if (master == false && emitAndPreventActions.indexOf(action.type) > -1) {
            return null;
        }
    }

    return next(action);
};

export default createEmitActionsMiddleware;