gitter-markdown-processor/lib/decoration-url-matcher.js

parses gitter chat messages, but in its own process

'use strict';

const url = require('url');

const URL_RE = /(?:\/(.*))+?\/(.*)\/(issues|merge_requests|pull|commit)\/([a-f0-9]+)$/;

function isValidIssueNumber(val) {
  const number = Number(val);
  return number > 0 && number < Infinity;
}

function isValidCommitHash(val) {
  const hash = val.match(/[a-f0-9]*/)[0] || '';
  return val.length === hash.length;
}

// eslint-disable-next-line complexity
module.exports = function decorateUrl(href) {
  // https://github.com/gitterHQ/gitter/issues/1685
  // https://github.com/gitterHQ/gitter/pull/21
  // https://github.com/gitterHQ/ui-components/commit/ba64903a90bfaac2ac137af514e3dab62a302a5d
  //
  // https://gitlab.com/gitlab-org/gitter/webapp/issues/14
  // https://gitlab.com/gitlab-org/gitter/webapp/-/issues/14
  // https://gitlab.com/gitlab-org/gitter/webapp/merge_requests/1075
  // https://gitlab.com/gitlab-org/gitter/styleguide/commit/6a61175e447548d9e1f3e5ed8e329d8578a38bb1
  const urlObj = url.parse(href);
  const pathname = urlObj.pathname || '';
  // removing the GitLab specific /-/ from the path before matching
  const pathMatches = pathname.replace('/-/', '/').match(URL_RE);

  const isGitLab = urlObj.hostname === 'gitlab.com';
  const isGitHub = urlObj.hostname === 'github.com';

  if ((isGitHub || isGitLab) && !urlObj.hash && pathMatches) {
    const group = pathMatches[1];
    const project = pathMatches[2];
    const pathType = pathMatches[3];
    const id = pathMatches[4];

    if (
      (pathType === 'issues' || pathType === 'merge_requests' || pathType === 'pull') &&
      id &&
      isValidIssueNumber(id)
    ) {
      let type = 'issue';
      if (project === 'issues') {
        type = 'issue';
      } else if (pathType === 'merge_requests') {
        type = 'mr';
      } else if (pathType === 'pull') {
        type = 'pr';
      }

      return {
        type,
        provider: isGitLab ? 'gitlab' : 'github',
        repo: `${group}/${project}`,
        id,
        href,
        text: `${group}/${project}${isGitLab && type === 'mr' ? '!' : '#'}${id}`,
      };
    }
    if (pathType === 'commit' && id && isValidCommitHash(id)) {
      return {
        type: 'commit',
        provider: isGitLab ? 'gitlab' : 'github',
        repo: `${group}/${project}`,
        id,
        href,
        text: `${group}/${project}@${id.substring(0, 7)}`,
      };
    }
  }
};