_redirects

# make sure you put this in the root of the generate site build, not just in the root of your netlify repository!
/.well-known/webfinger* https://APPNAME.deno.dev/:splat 200

webfinger.js

import { serve } from "https://deno.land/std@0.140.0/http/server.ts";

serve((req) => {
  const url = new URL(req.url);
  const resource = url.searchParams.get('resource') || 'acct:SusanPotter@mastodon.social';
  const rel = url.searchParams.get('rel');
  console.log({resource, rel, url: url.toString(), headers: { "X-From": req.headers.get('X-From') } });

  return new Response(
    JSON.stringify(getSubjectByRel(resource, rel)),
    { headers: { "content-type": "application/json" } }
  );
});

const getSubjectByRel = (subject, rel) => {
  const entry = subjects[subject];
  const filteredLinks = rel ? entry.links.filter(link => link.rel == rel) : entry.links;
  return { subject: entry.subject, aliases: entry.aliases, links: filteredLinks, };
};

const mastodonDocument = {
  "subject": "acct:SusanPotter@mastodon.social",
  "aliases": [
    "https://mastodon.social/@SusanPotter",
    "https://mastodon.social/users/SusanPotter"
  ],
  "links": [
    {
      "rel": "http://webfinger.net/rel/profile-page",
      "type": "text/html",
      "href": "https://mastodon.social/@SusanPotter"
    },
    {
      "rel": "self",
      "type": "application/activity+json",
      "href": "https://mastodon.social/users/SusanPotter"
    },
    {
      "rel": "http://ostatus.org/schema/1.0/subscribe",
      "template": "https://mastodon.social/authorize_interaction?uri={uri}"
    }
  ]
};

const subjects = {
  "acct:SusanPotter@mastodon.social": mastodonDocument,
  "acct:me@susanpotter.net": mastodonDocument,
  "acct:SusanPotter@susanpotter.net": mastodonDocument,
};