Whitelisting domains? about remark-external-links

[zslabs]

Created https://github.com/zslabs/remark-relative-links

[wooorm]

Hmm, interesting! You could also create a plugin that “relativises” URLs based on a given domain! Something like this plugin, but rewriting the URLs based on a base url?

[zslabs]

@wooorm Good idea! Until I publish a repo, here's what I ended up using (for anyone else reading this later; I put this in before remark-external-links:

const visit = require('unist-util-visit');

module.exports = (options = {}) => {
  if (!options.domainRegex) {
    throw Error('Missing required "domainRegex" option');
  }

  function visitor(node) {
    if (options.domainRegex.test(node.url)) {
      node.url = node.url.replace(options.domainRegex, '/');
    }
  }

  function transform(tree) {
    visit(tree, 'link', visitor);
    visit(tree, 'linkReference', visitor);
  }

  return transform;
};

Example regex: /http[s]*:\/\/[www.]*google\.com[/]?/