accounts-frontend/src/services/authFlow/LoginState.js

// @flow
import logger from 'services/logger';
import { getLogin } from 'components/auth/reducer';

import AbstractState from './AbstractState';
import PasswordState from './PasswordState';
import RegisterState from './RegisterState';

import type { AuthContext } from './AuthFlow';

export default class LoginState extends AbstractState {
    enter(context: AuthContext) {
        const login = getLogin(context.getState());
        const {user} = context.getState();

        const isUserAddsSecondAccount = !user.isGuest
            && /login|password/.test(context.getRequest().path); // TODO: improve me

        // TODO: it may not allow user to leave password state till he click back or enters password
        if (login) {
            context.setState(new PasswordState());
        } else if (user.isGuest || isUserAddsSecondAccount) {
            context.navigate('/login');
        } else {
            // can not detect needed state. Delegating decision to the next state
            context.setState(new PasswordState());
        }
    }

    resolve(context: AuthContext, payload: {
        login: string
    }) {
        context.run('login', payload)
            .then(() => context.setState(new PasswordState()))
            .catch((err = {}) =>
                err.errors || logger.warn('Error validating login', err)
            );
    }

    reject(context: AuthContext) {
        context.setState(new RegisterState());
    }

    goBack(context: AuthContext) {
        context.run('goBack', {
            fallbackUrl: '/'
        });
    }
}