hometown/app/javascript/mastodon/components/status_content.jsx

import PropTypes from 'prop-types';
import { PureComponent } from 'react';

import { FormattedMessage, injectIntl } from 'react-intl';

import classnames from 'classnames';
import { withRouter } from 'react-router-dom';

import ImmutablePropTypes from 'react-immutable-proptypes';
import { connect } from 'react-redux';

import ChevronRightIcon from '@/material-icons/400-24px/chevron_right.svg?react';
import { Icon }  from 'mastodon/components/icon';
import { Poll } from 'mastodon/components/poll';
import { identityContextPropShape, withIdentity } from 'mastodon/identity_context';
import { languages as preloadedLanguages } from 'mastodon/initial_state';

import { EmojiHTML } from './emoji/html';
import { HandledLink } from './status/handled_link';

const MAX_HEIGHT = 706; // 22px * 32 (+ 2px padding at the top)

/**
 *
 * @param {any} status
 * @returns {string}
 */
export function getStatusContent(status) {
  return status.getIn(['translation', 'contentHtml']) || status.get('contentHtml');
}

class TranslateButton extends PureComponent {

  static propTypes = {
    translation: ImmutablePropTypes.map,
    onClick: PropTypes.func,
  };

  render () {
    const { translation, onClick } = this.props;

    if (translation) {
      const language     = preloadedLanguages.find(lang => lang[0] === translation.get('detected_source_language'));
      const languageName = language ? language[1] : translation.get('detected_source_language');
      const provider     = translation.get('provider');

      return (
        <div className='translate-button'>
          <button className='link-button' onClick={onClick}>
            <FormattedMessage id='status.show_original' defaultMessage='Show original' />
          </button>

          <div className='translate-button__meta'>
            <FormattedMessage id='status.translated_from_with' defaultMessage='Translated from {lang} using {provider}' values={{ lang: languageName, provider }} />
          </div>
        </div>
      );
    }

    return (
      <button className='status__content__translate-button' onClick={onClick}>
        <FormattedMessage id='status.translate' defaultMessage='Translate' />
      </button>
    );
  }

}

const mapStateToProps = state => ({
  languages: state.getIn(['server', 'translationLanguages', 'items']),
});

const compareUrls = (href1, href2) => {
  try {
    const url1 = new URL(href1);
    const url2 = new URL(href2);

    return url1.origin === url2.origin && url1.pathname === url2.pathname && url1.search === url2.search;
  } catch {
    return false;
  }
};

class StatusContent extends PureComponent {
  static propTypes = {
    identity: identityContextPropShape,
    status: ImmutablePropTypes.map.isRequired,
    statusContent: PropTypes.string,
    onTranslate: PropTypes.func,
    onClick: PropTypes.func,
    collapsible: PropTypes.bool,
    onCollapsedToggle: PropTypes.func,
    languages: ImmutablePropTypes.map,
    intl: PropTypes.object,
    // from react-router
    match: PropTypes.object.isRequired,
    location: PropTypes.object.isRequired,
    history: PropTypes.object.isRequired,
    // from hometown
    statusActivityObjectType: PropTypes.string,
  };

  _updateStatusLinks () {
    const node = this.node;

    if (!node) {
      return;
    }

    const { status, onCollapsedToggle } = this.props;
    if (status.get('collapsed', null) === null && onCollapsedToggle) {
      const { collapsible, onClick } = this.props;

      const collapsed =
          collapsible
          && onClick
          && node.clientHeight > MAX_HEIGHT
          && status.get('spoiler_text').length === 0;

      onCollapsedToggle(collapsed);
    }
  }

  componentDidMount () {
    this._updateStatusLinks();
  }

  componentDidUpdate () {
    this._updateStatusLinks();
  }

  handleMouseDown = (e) => {
    this.startXY = [e.clientX, e.clientY];
  };

  handleMouseUp = (e) => {
    if (!this.startXY) {
      return;
    }

    const [ startX, startY ] = this.startXY;
    const [ deltaX, deltaY ] = [Math.abs(e.clientX - startX), Math.abs(e.clientY - startY)];

    let element = e.target;
    while (element) {
      if (element.localName === 'button' || element.localName === 'a' || element.localName === 'label') {
        return;
      }
      element = element.parentNode;
    }

    if (deltaX + deltaY < 5 && (e.button === 0 || e.button === 1) && e.detail >= 1 && this.props.onClick) {
      this.props.onClick(e);
    }

    this.startXY = null;
  };

  handleTranslate = () => {
    this.props.onTranslate();
  };

  setRef = (c) => {
    this.node = c;
  };

  handleElement = (element, { key, ...props }, children) => {
    if (element instanceof HTMLAnchorElement) {
      const mention = this.props.status.get('mentions').find(item => compareUrls(element.href, item.get('url')));
      return (
        <HandledLink
          {...props}
          href={element.href}
          text={element.innerText}
          hashtagAccountId={this.props.status.getIn(['account', 'id'])}
          mention={mention?.toJSON()}
          key={key}
        >
          {children}
        </HandledLink>
      );
    } else if (element.classList.contains('quote-inline') && this.props.status.get('quote')) {
      return null;
    }
    return undefined;
  }

  render () {
    const { status, intl, statusContent } = this.props;

    const renderReadMore = this.props.onClick && status.get('collapsed');
    const renderReadArticle = status.get('activity_pub_type') === 'Article' && !status.get('collapsed') && this.props.onClick;
    const contentLocale = intl.locale.replace(/[_-].*/, '');
    const targetLanguages = this.props.languages?.get(status.get('language') || 'und');
    const renderTranslate = this.props.onTranslate && this.props.identity.signedIn && ['public', 'unlisted'].includes(status.get('visibility')) && status.get('search_index').trim().length > 0 && targetLanguages?.includes(contentLocale);

    const content = statusContent ?? getStatusContent(status);
    const language = status.getIn(['translation', 'language']) || status.get('language');
    const classNames = classnames('status__content', {
      'status__content--with-action': this.props.onClick && this.props.history,
      'status__content--collapsed': renderReadMore,
    });

    const readMoreButton = renderReadMore && (
      <button className='status__content__read-more-button' onClick={this.props.onClick} key='read-more'>
        <FormattedMessage id='status.read_more' defaultMessage='Read more' /><Icon id='angle-right' icon={ChevronRightIcon} />
      </button>
    );

    const readArticleButton = renderReadArticle && (
      <button className='status__content__read-more-button' onClick={this.props.onClick} key='read-more'>
        <FormattedMessage id='status.read_article' defaultMessage='Read article' /><Icon id='angle-right' icon={ChevronRightIcon} fixedWidth />
      </button>
    );

    const translateButton = renderTranslate && (
      <TranslateButton onClick={this.handleTranslate} translation={status.get('translation')} />
    );

    const poll = !!status.get('poll') && (
      <Poll pollId={status.get('poll')} status={status} lang={language} />
    );

    if (this.props.statusActivityObjectType === 'Article') {
      const title = status.get('title');
      const summary = status.get('spoilerHtml');
      return (
        <>
          {title && <div className='status__content article'><h2>Title: {status.get('title')}</h2></div>}
          {summary && <div className='status__content article'><em>Summary: {status.get('spoiler_text')}</em></div>}
          {readArticleButton}
        </>
      );
    } else if (this.props.onClick) {
      return (
        <>
          <div
            className={classNames}
            ref={this.setRef}
            onMouseDown={this.handleMouseDown}
            onMouseUp={this.handleMouseUp}
            key='status-content'
          >
            <EmojiHTML
              className='status__content__text status__content__text--visible translate'
              lang={language}
              htmlString={content}
              extraEmojis={status.get('emojis')}
              onElement={this.handleElement}
            />

            {poll}
            {translateButton}
          </div>

          {readMoreButton}

          {readArticleButton}
        </>
      );
    } else {
      return (
        <div className={classNames} ref={this.setRef}>
          <EmojiHTML
            className='status__content__text status__content__text--visible translate'
            lang={language}
            htmlString={content}
            extraEmojis={status.get('emojis')}
            onElement={this.handleElement}
          />

          {poll}
          {translateButton}
        </div>
      );
    }
  }

}

export default withRouter(withIdentity(connect(mapStateToProps)(injectIntl(StatusContent))));