verdaccio-ui/src/components/Login/Login.tsx

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import Button from '@material-ui/core/Button';
import DialogTitle from '@material-ui/core/DialogTitle';
import Dialog from '@material-ui/core/Dialog';
import DialogActions from '@material-ui/core/DialogActions';
import DialogContent from '@material-ui/core/DialogContent';
import SnackbarContent from '@material-ui/core/SnackbarContent';
import ErrorIcon from '@material-ui/icons/Error';
import InputLabel from '@material-ui/core/InputLabel';
import Input from '@material-ui/core/Input';
import FormControl from '@material-ui/core/FormControl';
import FormHelperText from '@material-ui/core/FormHelperText';

// @ts-ignore
import classes from './login.scss';

export default class LoginModal extends Component<any, any> {
  static propTypes = {
    visibility: PropTypes.bool,
    error: PropTypes.object,
    onCancel: PropTypes.func,
    onSubmit: PropTypes.func,
  };

  static defaultProps = {
    error: {},
    onCancel: () => {},
    onSubmit: () => {},
    visibility: true,
  };

  constructor(props) {
    super(props);
    this.state = {
      form: {
        username: {
          required: true,
          pristine: true,
          helperText: 'Field required',
          value: '',
        },
        password: {
          required: true,
          pristine: true,
          helperText: 'Field required',
          value: '',
        },
      },
      error: props.error,
    };
  }

  /**
   * set login modal's username and password to current state
   * Required to login
   */
  setCredentials = (name, e) => {
    const { form } = this.state;
    this.setState({
      form: {
        ...form,
        [name]: {
          ...form[name],
          value: e.target.value,
          pristine: false,
        },
      },
    });
  };

  setUsername = event => {
    this.setCredentials('username', event);
  };

  setPassword = event => {
    this.setCredentials('password', event);
  };

  validateCredentials = event => {
    const { form } = this.state;
    // prevents default submit behavior
    event.preventDefault();

    this.setState(
      {
        form: Object.keys(form).reduce(
          (acc, key) => ({
            ...acc,
            ...{ [key]: { ...form[key], pristine: false } },
          }),
          {}
        ),
      },
      () => {
        if (!Object.keys(form).some(id => !form[id])) {
          this.submitCredentials();
        }
      }
    );
  };

  submitCredentials = async () => {
    const { form } = this.state;
    const { onSubmit } = this.props;
    await onSubmit(form.username.value, form.password.value);
    // let's wait for API response and then set
    // username and password filed to empty state
    this.setState({
      form: Object.keys(form).reduce(
        (acc, key) => ({
          ...acc,
          ...{ [key]: { ...form[key], value: '', pristine: true } },
        }),
        {}
      ),
    });
  };

  renderErrorMessage(title, description) {
    return (
      <span>
        <div>
          <strong>{title}</strong>
        </div>
        <div>{description}</div>
      </span>
    );
  }

  renderMessage(title, description) {
    return (
      <div className={classes.loginErrorMsg} id={'client-snackbar'}>
        <ErrorIcon className={classes.loginIcon} />
        {this.renderErrorMessage(title, description)}
      </div>
    );
  }

  renderLoginError({ type, title, description }) {
    return type === 'error' && <SnackbarContent className={classes.loginError} message={this.renderMessage(title, description)} />;
  }

  renderNameField = () => {
    const {
      form: { username },
    } = this.state;
    return (
      <FormControl error={!username.value && !username.pristine} fullWidth={true} required={username.required}>
        <InputLabel htmlFor={'username'}>{'Username'}</InputLabel>
        <Input id={'login--form-username'} onChange={this.setUsername} placeholder={'Your username'} value={username.value} />
        {!username.value && !username.pristine && <FormHelperText id={'username-error'}>{username.helperText}</FormHelperText>}
      </FormControl>
    );
  };

  renderPasswordField = () => {
    const {
      form: { password },
    } = this.state;
    return (
      <FormControl error={!password.value && !password.pristine} fullWidth={true} required={password.required} style={{ marginTop: '8px' }}>
        <InputLabel htmlFor={'password'}>{'Password'}</InputLabel>
        <Input id={'login--form-password'} onChange={this.setPassword} placeholder={'Your strong password'} type={'password'} value={password.value} />
        {!password.value && !password.pristine && <FormHelperText id={'password-error'}>{password.helperText}</FormHelperText>}
      </FormControl>
    );
  };

  renderActions = () => {
    const {
      form: { username, password },
    } = this.state;
    const { onCancel } = this.props;
    return (
      <DialogActions className={'dialog-footer'}>
        <Button color={'inherit'} id={'login--form-cancel'} onClick={onCancel} type={'button'}>
          {'Cancel'}
        </Button>
        <Button color={'inherit'} disabled={!password.value || !username.value} id={'login--form-submit'} type={'submit'}>
          {'Login'}
        </Button>
      </DialogActions>
    );
  };

  render() {
    const { visibility, onCancel, error } = this.props;
    return (
      <Dialog fullWidth={true} id={'login--form-container'} maxWidth={'xs'} onClose={onCancel} open={visibility}>
        <form noValidate={true} onSubmit={this.validateCredentials}>
          <DialogTitle>{'Login'}</DialogTitle>
          <DialogContent>
            {this.renderLoginError(error)}
            {this.renderNameField()}
            {this.renderPasswordField()}
          </DialogContent>
          {this.renderActions()}
        </form>
      </Dialog>
    );
  }
}