nas/app/javascript/mastodon/features/ui/components/sign_in_banner.jsx

import { useCallback } from 'react';

import { FormattedMessage } from 'react-intl';


import { openModal } from 'mastodon/actions/modal';
import { registrationsOpen, sso_redirect } from 'mastodon/initial_state';
import { useAppDispatch, useAppSelector } from 'mastodon/store';

const SignInBanner = () => {
  const dispatch = useAppDispatch();

  const openClosedRegistrationsModal = useCallback(
    () => dispatch(openModal({ modalType: 'CLOSED_REGISTRATIONS' })),
    [dispatch],
  );

  let signupButton;

  const signupUrl = useAppSelector((state) => state.getIn(['server', 'server', 'registrations', 'url'], null) || '/auth/sign_up');

  if (sso_redirect) {
    return (
      <div className='sign-in-banner'>
        <p><strong><FormattedMessage id='sign_in_banner.mastodon_is' defaultMessage="Join the Fediverse, become part of a community, and break free from Big Tech™'s stranglehold on public discourse." /></strong></p>
        <p><FormattedMessage id='sign_in_banner.follow_anyone' defaultMessage='Follow anyone across the fediverse and see it all in chronological order. No algorithms, ads, or clickbait in sight.' /></p>
        <a href={sso_redirect} data-method='post' className='button button--block button-tertiary'><FormattedMessage id='sign_in_banner.sso_redirect' defaultMessage='Login or Register' /></a>
      </div>
    );
  }

  if (registrationsOpen) {
    signupButton = (
      <a href={signupUrl} className='button button--block'>
        <FormattedMessage id='sign_in_banner.create_account' defaultMessage='Create account' />
      </a>
    );
  } else {
    signupButton = (
      <button className='button button--block' onClick={openClosedRegistrationsModal}>
        <FormattedMessage id='sign_in_banner.create_account' defaultMessage='Create account' />
      </button>
    );
  }

  return (
    <div className='sign-in-banner'>
      <p><strong><FormattedMessage id='sign_in_banner.mastodon_is' defaultMessage="Join the Fediverse, become part of a community, and break free from Big Tech™'s stranglehold on public discourse." /></strong></p>
      <p><FormattedMessage id='sign_in_banner.follow_anyone' defaultMessage='Follow anyone across the fediverse and see it all in chronological order. No algorithms, ads, or clickbait in sight.' /></p>
      {signupButton}
      <a href='/auth/sign_in' className='button button--block button-tertiary'><FormattedMessage id='sign_in_banner.sign_in' defaultMessage='Login' /></a>
    </div>
  );
};

export default SignInBanner;