Webfinger for instance actor.

routes/.well-known/webfinger.js

@@ -0,0 +1,30 @@
+const express = require('express');
+
+module.exports = {
+    /**
+     * @param {express.Request} req
+     * @param {express.Response} res
+     * @param {express.NextFunction} _next
+     */
+    get: async (req, res, _next) => {
+        res.setHeader("content-type", "application/jrd+json");
+        res.json(
+            {
+                "subject": `acct:${req.headers.host}@${req.headers.host}`,
+                "aliases": [`https://${req.headers.host}/actor`],
+                "links": [
+                    {
+                        "rel": "http://webfinger.net/rel/profile-page",
+                        "type": "text/html",
+                        "href": `https://${req.headers.host}/about/more?instance_actor=true`
+                    },
+                    {
+                        "rel": "self",
+                        "type": "application/activity+json",
+                        "href": `https://${req.headers.host}/actor`
+                    }
+                ]
+            }
+        )
+    }
+}