auth - commonreducer

const defaultState = {
  appName: 'Conduit',
  token: null
};

export default (state = defaultState, action) => {
  switch (action.type) {
    // APP_LOAD => set token, user, loaded state
    case 'APP_LOAD':
      return {
        ...state,
        token: action.token || null,
        appLoaded: true,
        currentUser: action.payload ? action.payload.user : null,
      };
    // REDIRECT ->< remove redirectTO from state
    case 'REDIRECT':
      return {...state, redirectTo: null};
    // LOGIN => redirect to home, put token and user into state
    case 'LOGIN':
      return {
        ...state,
        redirectTo: action.error ? null : '/',
        token: action.error ? null : action.payload.user.token,
        currentUser: action.error ? null : action.payload.user,
      };
    default:
      return state;
  }
};