ecency-mobile/src/utils/postUrlParser.js

const parseCatAuthorPermlink = u => {
  const postRegex = /^https?:\/\/(.*)\/(.*)\/(@[\w.\d-]+)\/(.*)/i;
  const postMatch = u.match(postRegex);

  if (postMatch && postMatch.length === 5) {
    return {
      author: postMatch[3].replace('@', ''),
      permlink: postMatch[4],
    };
  }
  const authorRegex = /^https?:\/\/(.*)\/(.*)\/(@[\w.\d-]+)/i;
  const authorMatch = u.match(authorRegex);
  if (authorMatch && authorMatch.length === 4) {
    return {
      author: authorMatch[3].replace('@', ''),
      permlink: null,
    };
  }
  return null;
};

const parseAuthorPermlink = u => {
  const r = /^https?:\/\/(.*)\/(@[\w.\d-]+)\/(.*)/i;
  const match = u.match(r);

  if (match && match.length === 4) {
    return {
      author: match[2].replace('@', ''),
      permlink: match[3],
    };
  }
  const authorRegex = /^https?:\/\/(.*)\/(@[\w.\d-]+)/i;
  const authorMatch = u.match(authorRegex);
  if (authorMatch && authorMatch.length === 3) {
    return {
      author: authorMatch[2].replace('@', ''),
      permlink: null,
    };
  }

  return null;
};

export default url => {
  if (url.startsWith('esteem://')) {
    url = url.replace('esteem://', 'https://esteem.app/');
  }

  // eslint-disable-next-line no-useless-escape
  const feedMatch = url.match(/^https:\/\/([\w-\.]*)\/([\w-]*)\/?([\w-]*)\/?$/);

  if (feedMatch) {
    if (feedMatch[3]) {
      return {
        feedType: feedMatch[2],
        tag: feedMatch[3],
      };
    }
    return {
      feedType: feedMatch[2],
    };
  }

  if (
    ['https://estm.to', 'https://esteem.app', 'https://hive.blog', 'https://peakd.com'].some(x =>
      url.startsWith(x),
    )
  ) {
    return parseCatAuthorPermlink(url);
  }

  if (['https://busy.org', 'https://steemhunt.com'].some(x => url.startsWith(x))) {
    return parseAuthorPermlink(url);
  }

  // For non urls like @good-karma/esteem-london-presentation-e3105ba6637ed
  let match = url.match(/^[/]?(@[\w.\d-]+)\/(.*)/);
  if (match && match.length === 3) {
    return {
      author: match[1].replace('@', ''),
      permlink: match[2],
    };
  }

  // For non urls with category like esteem/@good-karma/esteem-london-presentation-e3105ba6637ed
  match = url.match(/([\w.\d-]+)\/(@[\w.\d-]+)\/(.*)/);
  if (match && match.length === 4) {
    return {
      category: match[1],
      author: match[2].replace('@', ''),
      permlink: match[3],
    };
  }

  return null;
};