webfinger/main.go

package main

import (
	"fmt"
	"net/http"
)

var redirects map[string][]string

func HandleWebfinger(w http.ResponseWriter, req *http.Request) {
	olduser := req.URL.Query().Get("resource")[5:]
	newuser, ok := redirects[olduser]
	if !ok {
		w.WriteHeader(404)
		return
	}

	s := `{
    "subject": "acct:%[1]s@%[2]s",
    "aliases": [
        "https://%[2]s/@%[1]s",
        "https://%[2]s/users/%[1]s"
    ],
    "links": [
        {
            "rel": "http://webfinger.net/rel/profile-page",
            "type": "text/html",
            "href": "https://%[2]s/@%[1]s"
        },
        {
            "rel": "self",
            "type": "application/activity+json",
            "href": "https://%[2]s/users/%[1]s"
        }
    ]
}`
	w.Header().Set("Content-Type", "application/json")
	fmt.Fprintln(w, fmt.Sprintf(s, newuser[0], newuser[1]))
}

func main() {
	redirects = make(map[string][]string)
    redirects["astra@gearheads.social"] = []string{"astra", "ap.zio.sh"}
    redirects["ducky@gearheads.social"] = []string{"ducky", "ap.zio.sh"}
    redirects["creativeicing@gearheads.social"] = []string{"CreativeIcing", "rubber.social"}
    redirects["gearbound@gearheads.social"] = []string{"gearbound", "rubber.social"}

	http.HandleFunc("/.well-known/webfinger", HandleWebfinger)
	http.ListenAndServe(":8888", nil)
}